xref: /titanic_52/usr/src/uts/i86pc/os/cpuid.c (revision ff17c8bf86c3e567734be83f90267edee20f580f)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*
 * Various routines to handle identification
 * and classification of x86 processors.
 */

#include <sys/types.h>
#include <sys/archsystm.h>
#include <sys/x86_archext.h>
#include <sys/kmem.h>
#include <sys/systm.h>
#include <sys/cmn_err.h>
#include <sys/sunddi.h>
#include <sys/sunndi.h>
#include <sys/cpuvar.h>
#include <sys/processor.h>
#include <sys/sysmacros.h>
#include <sys/pg.h>
#include <sys/fp.h>
#include <sys/controlregs.h>
#include <sys/auxv_386.h>
#include <sys/bitmap.h>
#include <sys/memnode.h>

/*
 * Pass 0 of cpuid feature analysis happens in locore. It contains special code
 * to recognize Cyrix processors that are not cpuid-compliant, and to deal with
 * them accordingly. For most modern processors, feature detection occurs here
 * in pass 1.
 *
 * Pass 1 of cpuid feature analysis happens just at the beginning of mlsetup()
 * for the boot CPU and does the basic analysis that the early kernel needs.
 * x86_feature is set based on the return value of cpuid_pass1() of the boot
 * CPU.
 *
 * Pass 1 includes:
 *
 *	o Determining vendor/model/family/stepping and setting x86_type and
 *	  x86_vendor accordingly.
 *	o Processing the feature flags returned by the cpuid instruction while
 *	  applying any workarounds or tricks for the specific processor.
 *	o Mapping the feature flags into Solaris feature bits (X86_*).
 *	o Processing extended feature flags if supported by the processor,
 *	  again while applying specific processor knowledge.
 *	o Determining the CMT characteristics of the system.
 *
 * Pass 1 is done on non-boot CPUs during their initialization and the results
 * are used only as a meager attempt at ensuring that all processors within the
 * system support the same features.
 *
 * Pass 2 of cpuid feature analysis happens just at the beginning
 * of startup().  It just copies in and corrects the remainder
 * of the cpuid data we depend on: standard cpuid functions that we didn't
 * need for pass1 feature analysis, and extended cpuid functions beyond the
 * simple feature processing done in pass1.
 *
 * Pass 3 of cpuid analysis is invoked after basic kernel services; in
 * particular kernel memory allocation has been made available. It creates a
 * readable brand string based on the data collected in the first two passes.
 *
 * Pass 4 of cpuid analysis is invoked after post_startup() when all
 * the support infrastructure for various hardware features has been
 * initialized. It determines which processor features will be reported
 * to userland via the aux vector.
 *
 * All passes are executed on all CPUs, but only the boot CPU determines what
 * features the kernel will use.
 *
 * Much of the worst junk in this file is for the support of processors
 * that didn't really implement the cpuid instruction properly.
 *
 * NOTE: The accessor functions (cpuid_get*) are aware of, and ASSERT upon,
 * the pass numbers.  Accordingly, changes to the pass code may require changes
 * to the accessor code.
 */

uint_t x86_feature = 0;
uint_t x86_vendor = X86_VENDOR_IntelClone;
uint_t x86_type = X86_TYPE_OTHER;

uint_t pentiumpro_bug4046376;
uint_t pentiumpro_bug4064495;

uint_t enable486;

/*
 * This set of strings are for processors rumored to support the cpuid
 * instruction, and is used by locore.s to figure out how to set x86_vendor
 */
const char CyrixInstead[] = "CyrixInstead";

/*
 * monitor/mwait info.
 *
 * size_actual and buf_actual are the real address and size allocated to get
 * proper mwait_buf alignement.  buf_actual and size_actual should be passed
 * to kmem_free().  Currently kmem_alloc() and mwait happen to both use
 * processor cache-line alignment, but this is not guarantied in the furture.
 */
struct mwait_info {
	size_t		mon_min;	/* min size to avoid missed wakeups */
	size_t		mon_max;	/* size to avoid false wakeups */
	size_t		size_actual;	/* size actually allocated */
	void		*buf_actual;	/* memory actually allocated */
	uint32_t	support;	/* processor support of monitor/mwait */
};

/*
 * These constants determine how many of the elements of the
 * cpuid we cache in the cpuid_info data structure; the
 * remaining elements are accessible via the cpuid instruction.
 */

#define	NMAX_CPI_STD	6		/* eax = 0 .. 5 */
#define	NMAX_CPI_EXTD	9		/* eax = 0x80000000 .. 0x80000008 */

struct cpuid_info {
	uint_t cpi_pass;		/* last pass completed */
	/*
	 * standard function information
	 */
	uint_t cpi_maxeax;		/* fn 0: %eax */
	char cpi_vendorstr[13];		/* fn 0: %ebx:%ecx:%edx */
	uint_t cpi_vendor;		/* enum of cpi_vendorstr */

	uint_t cpi_family;		/* fn 1: extended family */
	uint_t cpi_model;		/* fn 1: extended model */
	uint_t cpi_step;		/* fn 1: stepping */
	chipid_t cpi_chipid;		/* fn 1: %ebx: chip # on ht cpus */
	uint_t cpi_brandid;		/* fn 1: %ebx: brand ID */
	int cpi_clogid;			/* fn 1: %ebx: thread # */
	uint_t cpi_ncpu_per_chip;	/* fn 1: %ebx: logical cpu count */
	uint8_t cpi_cacheinfo[16];	/* fn 2: intel-style cache desc */
	uint_t cpi_ncache;		/* fn 2: number of elements */
	uint_t cpi_ncpu_shr_last_cache;	/* fn 4: %eax: ncpus sharing cache */
	id_t cpi_last_lvl_cacheid;	/* fn 4: %eax: derived cache id */
	uint_t cpi_std_4_size;		/* fn 4: number of fn 4 elements */
	struct cpuid_regs **cpi_std_4;	/* fn 4: %ecx == 0 .. fn4_size */
	struct cpuid_regs cpi_std[NMAX_CPI_STD];	/* 0 .. 5 */
	/*
	 * extended function information
	 */
	uint_t cpi_xmaxeax;		/* fn 0x80000000: %eax */
	char cpi_brandstr[49];		/* fn 0x8000000[234] */
	uint8_t cpi_pabits;		/* fn 0x80000006: %eax */
	uint8_t cpi_vabits;		/* fn 0x80000006: %eax */
	struct cpuid_regs cpi_extd[NMAX_CPI_EXTD]; /* 0x8000000[0-8] */
	id_t cpi_coreid;		/* same coreid => strands share core */
	int cpi_pkgcoreid;		/* core number within single package */
	uint_t cpi_ncore_per_chip;	/* AMD: fn 0x80000008: %ecx[7-0] */
					/* Intel: fn 4: %eax[31-26] */
	/*
	 * supported feature information
	 */
	uint32_t cpi_support[5];
#define	STD_EDX_FEATURES	0
#define	AMD_EDX_FEATURES	1
#define	TM_EDX_FEATURES		2
#define	STD_ECX_FEATURES	3
#define	AMD_ECX_FEATURES	4
	/*
	 * Synthesized information, where known.
	 */
	uint32_t cpi_chiprev;		/* See X86_CHIPREV_* in x86_archext.h */
	const char *cpi_chiprevstr;	/* May be NULL if chiprev unknown */
	uint32_t cpi_socket;		/* Chip package/socket type */

	struct mwait_info cpi_mwait;	/* fn 5: monitor/mwait info */
};


static struct cpuid_info cpuid_info0;

/*
 * These bit fields are defined by the Intel Application Note AP-485
 * "Intel Processor Identification and the CPUID Instruction"
 */
#define	CPI_FAMILY_XTD(cpi)	BITX((cpi)->cpi_std[1].cp_eax, 27, 20)
#define	CPI_MODEL_XTD(cpi)	BITX((cpi)->cpi_std[1].cp_eax, 19, 16)
#define	CPI_TYPE(cpi)		BITX((cpi)->cpi_std[1].cp_eax, 13, 12)
#define	CPI_FAMILY(cpi)		BITX((cpi)->cpi_std[1].cp_eax, 11, 8)
#define	CPI_STEP(cpi)		BITX((cpi)->cpi_std[1].cp_eax, 3, 0)
#define	CPI_MODEL(cpi)		BITX((cpi)->cpi_std[1].cp_eax, 7, 4)

#define	CPI_FEATURES_EDX(cpi)		((cpi)->cpi_std[1].cp_edx)
#define	CPI_FEATURES_ECX(cpi)		((cpi)->cpi_std[1].cp_ecx)
#define	CPI_FEATURES_XTD_EDX(cpi)	((cpi)->cpi_extd[1].cp_edx)
#define	CPI_FEATURES_XTD_ECX(cpi)	((cpi)->cpi_extd[1].cp_ecx)

#define	CPI_BRANDID(cpi)	BITX((cpi)->cpi_std[1].cp_ebx, 7, 0)
#define	CPI_CHUNKS(cpi)		BITX((cpi)->cpi_std[1].cp_ebx, 15, 7)
#define	CPI_CPU_COUNT(cpi)	BITX((cpi)->cpi_std[1].cp_ebx, 23, 16)
#define	CPI_APIC_ID(cpi)	BITX((cpi)->cpi_std[1].cp_ebx, 31, 24)

#define	CPI_MAXEAX_MAX		0x100		/* sanity control */
#define	CPI_XMAXEAX_MAX		0x80000100
#define	CPI_FN4_ECX_MAX		0x20		/* sanity: max fn 4 levels */

/*
 * Function 4 (Deterministic Cache Parameters) macros
 * Defined by Intel Application Note AP-485
 */
#define	CPI_NUM_CORES(regs)		BITX((regs)->cp_eax, 31, 26)
#define	CPI_NTHR_SHR_CACHE(regs)	BITX((regs)->cp_eax, 25, 14)
#define	CPI_FULL_ASSOC_CACHE(regs)	BITX((regs)->cp_eax, 9, 9)
#define	CPI_SELF_INIT_CACHE(regs)	BITX((regs)->cp_eax, 8, 8)
#define	CPI_CACHE_LVL(regs)		BITX((regs)->cp_eax, 7, 5)
#define	CPI_CACHE_TYPE(regs)		BITX((regs)->cp_eax, 4, 0)

#define	CPI_CACHE_WAYS(regs)		BITX((regs)->cp_ebx, 31, 22)
#define	CPI_CACHE_PARTS(regs)		BITX((regs)->cp_ebx, 21, 12)
#define	CPI_CACHE_COH_LN_SZ(regs)	BITX((regs)->cp_ebx, 11, 0)

#define	CPI_CACHE_SETS(regs)		BITX((regs)->cp_ecx, 31, 0)

#define	CPI_PREFCH_STRIDE(regs)		BITX((regs)->cp_edx, 9, 0)


/*
 * A couple of shorthand macros to identify "later" P6-family chips
 * like the Pentium M and Core.  First, the "older" P6-based stuff
 * (loosely defined as "pre-Pentium-4"):
 * P6, PII, Mobile PII, PII Xeon, PIII, Mobile PIII, PIII Xeon
 */

#define	IS_LEGACY_P6(cpi) (			\
	cpi->cpi_family == 6 && 		\
		(cpi->cpi_model == 1 ||		\
		cpi->cpi_model == 3 ||		\
		cpi->cpi_model == 5 ||		\
		cpi->cpi_model == 6 ||		\
		cpi->cpi_model == 7 ||		\
		cpi->cpi_model == 8 ||		\
		cpi->cpi_model == 0xA ||	\
		cpi->cpi_model == 0xB)		\
)

/* A "new F6" is everything with family 6 that's not the above */
#define	IS_NEW_F6(cpi) ((cpi->cpi_family == 6) && !IS_LEGACY_P6(cpi))

/* Extended family/model support */
#define	IS_EXTENDED_MODEL_INTEL(cpi) (cpi->cpi_family == 0x6 || \
	cpi->cpi_family >= 0xf)

/*
 * AMD family 0xf and family 0x10 socket types.
 * First index :
 *		0 for family 0xf, revs B thru E
 *		1 for family 0xf, revs F and G
 *		2 for family 0x10, rev B
 * Second index by (model & 0x3)
 */
static uint32_t amd_skts[3][4] = {
	/*
	 * Family 0xf revisions B through E
	 */
#define	A_SKTS_0			0
	{
		X86_SOCKET_754,		/* 0b00 */
		X86_SOCKET_940,		/* 0b01 */
		X86_SOCKET_754,		/* 0b10 */
		X86_SOCKET_939		/* 0b11 */
	},
	/*
	 * Family 0xf revisions F and G
	 */
#define	A_SKTS_1			1
	{
		X86_SOCKET_S1g1,	/* 0b00 */
		X86_SOCKET_F1207,	/* 0b01 */
		X86_SOCKET_UNKNOWN,	/* 0b10 */
		X86_SOCKET_AM2		/* 0b11 */
	},
	/*
	 * Family 0x10 revisions A and B
	 * It is not clear whether, as new sockets release, that
	 * model & 0x3 will id socket for this family
	 */
#define	A_SKTS_2			2
	{
		X86_SOCKET_F1207,	/* 0b00 */
		X86_SOCKET_F1207,	/* 0b01 */
		X86_SOCKET_F1207,	/* 0b10 */
		X86_SOCKET_F1207,	/* 0b11 */
	}
};

/*
 * Table for mapping AMD Family 0xf and AMD Family 0x10 model/stepping
 * combination to chip "revision" and socket type.
 *
 * The first member of this array that matches a given family, extended model
 * plus model range, and stepping range will be considered a match.
 */
static const struct amd_rev_mapent {
	uint_t rm_family;
	uint_t rm_modello;
	uint_t rm_modelhi;
	uint_t rm_steplo;
	uint_t rm_stephi;
	uint32_t rm_chiprev;
	const char *rm_chiprevstr;
	int rm_sktidx;
} amd_revmap[] = {
	/*
	 * =============== AuthenticAMD Family 0xf ===============
	 */

	/*
	 * Rev B includes model 0x4 stepping 0 and model 0x5 stepping 0 and 1.
	 */
	{ 0xf, 0x04, 0x04, 0x0, 0x0, X86_CHIPREV_AMD_F_REV_B, "B", A_SKTS_0 },
	{ 0xf, 0x05, 0x05, 0x0, 0x1, X86_CHIPREV_AMD_F_REV_B, "B", A_SKTS_0 },
	/*
	 * Rev C0 includes model 0x4 stepping 8 and model 0x5 stepping 8
	 */
	{ 0xf, 0x04, 0x05, 0x8, 0x8, X86_CHIPREV_AMD_F_REV_C0, "C0", A_SKTS_0 },
	/*
	 * Rev CG is the rest of extended model 0x0 - i.e., everything
	 * but the rev B and C0 combinations covered above.
	 */
	{ 0xf, 0x00, 0x0f, 0x0, 0xf, X86_CHIPREV_AMD_F_REV_CG, "CG", A_SKTS_0 },
	/*
	 * Rev D has extended model 0x1.
	 */
	{ 0xf, 0x10, 0x1f, 0x0, 0xf, X86_CHIPREV_AMD_F_REV_D, "D", A_SKTS_0 },
	/*
	 * Rev E has extended model 0x2.
	 * Extended model 0x3 is unused but available to grow into.
	 */
	{ 0xf, 0x20, 0x3f, 0x0, 0xf, X86_CHIPREV_AMD_F_REV_E, "E", A_SKTS_0 },
	/*
	 * Rev F has extended models 0x4 and 0x5.
	 */
	{ 0xf, 0x40, 0x5f, 0x0, 0xf, X86_CHIPREV_AMD_F_REV_F, "F", A_SKTS_1 },
	/*
	 * Rev G has extended model 0x6.
	 */
	{ 0xf, 0x60, 0x6f, 0x0, 0xf, X86_CHIPREV_AMD_F_REV_G, "G", A_SKTS_1 },

	/*
	 * =============== AuthenticAMD Family 0x10 ===============
	 */

	/*
	 * Rev A has model 0 and stepping 0/1/2 for DR-{A0,A1,A2}.
	 * Give all of model 0 stepping range to rev A.
	 */
	{ 0x10, 0x00, 0x00, 0x0, 0x2, X86_CHIPREV_AMD_10_REV_A, "A", A_SKTS_2 },

	/*
	 * Rev B has model 2 and steppings 0/1/0xa/2 for DR-{B0,B1,BA,B2}.
	 * Give all of model 2 stepping range to rev B.
	 */
	{ 0x10, 0x02, 0x02, 0x0, 0xf, X86_CHIPREV_AMD_10_REV_B, "B", A_SKTS_2 },
};

/*
 * Info for monitor/mwait idle loop.
 *
 * See cpuid section of "Intel 64 and IA-32 Architectures Software Developer's
 * Manual Volume 2A: Instruction Set Reference, A-M" #25366-022US, November
 * 2006.
 * See MONITOR/MWAIT section of "AMD64 Architecture Programmer's Manual
 * Documentation Updates" #33633, Rev 2.05, December 2006.
 */
#define	MWAIT_SUPPORT		(0x00000001)	/* mwait supported */
#define	MWAIT_EXTENSIONS	(0x00000002)	/* extenstion supported */
#define	MWAIT_ECX_INT_ENABLE	(0x00000004)	/* ecx 1 extension supported */
#define	MWAIT_SUPPORTED(cpi)	((cpi)->cpi_std[1].cp_ecx & CPUID_INTC_ECX_MON)
#define	MWAIT_INT_ENABLE(cpi)	((cpi)->cpi_std[5].cp_ecx & 0x2)
#define	MWAIT_EXTENSION(cpi)	((cpi)->cpi_std[5].cp_ecx & 0x1)
#define	MWAIT_SIZE_MIN(cpi)	BITX((cpi)->cpi_std[5].cp_eax, 15, 0)
#define	MWAIT_SIZE_MAX(cpi)	BITX((cpi)->cpi_std[5].cp_ebx, 15, 0)
/*
 * Number of sub-cstates for a given c-state.
 */
#define	MWAIT_NUM_SUBC_STATES(cpi, c_state)			\
	BITX((cpi)->cpi_std[5].cp_edx, c_state + 3, c_state)

static void
synth_amd_info(struct cpuid_info *cpi)
{
	const struct amd_rev_mapent *rmp;
	uint_t family, model, step;
	int i;

	/*
	 * Currently only AMD family 0xf and family 0x10 use these fields.
	 */
	if (cpi->cpi_family != 0xf && cpi->cpi_family != 0x10)
		return;

	family = cpi->cpi_family;
	model = cpi->cpi_model;
	step = cpi->cpi_step;

	for (i = 0, rmp = amd_revmap; i < sizeof (amd_revmap) / sizeof (*rmp);
	    i++, rmp++) {
		if (family == rmp->rm_family &&
		    model >= rmp->rm_modello && model <= rmp->rm_modelhi &&
		    step >= rmp->rm_steplo && step <= rmp->rm_stephi) {
			cpi->cpi_chiprev = rmp->rm_chiprev;
			cpi->cpi_chiprevstr = rmp->rm_chiprevstr;
			cpi->cpi_socket = amd_skts[rmp->rm_sktidx][model & 0x3];
			return;
		}
	}
}

static void
synth_info(struct cpuid_info *cpi)
{
	cpi->cpi_chiprev = X86_CHIPREV_UNKNOWN;
	cpi->cpi_chiprevstr = "Unknown";
	cpi->cpi_socket = X86_SOCKET_UNKNOWN;

	switch (cpi->cpi_vendor) {
	case X86_VENDOR_AMD:
		synth_amd_info(cpi);
		break;

	default:
		break;

	}
}

/*
 * Apply up various platform-dependent restrictions where the
 * underlying platform restrictions mean the CPU can be marked
 * as less capable than its cpuid instruction would imply.
 */
#if defined(__xpv)
static void
platform_cpuid_mangle(uint_t vendor, uint32_t eax, struct cpuid_regs *cp)
{
	switch (eax) {
	case 1:
		cp->cp_edx &=
		    ~(CPUID_INTC_EDX_PSE |
		    CPUID_INTC_EDX_VME | CPUID_INTC_EDX_DE |
		    CPUID_INTC_EDX_MCA |	/* XXPV true on dom0? */
		    CPUID_INTC_EDX_SEP | CPUID_INTC_EDX_MTRR |
		    CPUID_INTC_EDX_PGE | CPUID_INTC_EDX_PAT |
		    CPUID_AMD_EDX_SYSC | CPUID_INTC_EDX_SEP |
		    CPUID_INTC_EDX_PSE36 | CPUID_INTC_EDX_HTT);
		break;

	case 0x80000001:
		cp->cp_edx &=
		    ~(CPUID_AMD_EDX_PSE |
		    CPUID_INTC_EDX_VME | CPUID_INTC_EDX_DE |
		    CPUID_AMD_EDX_MTRR | CPUID_AMD_EDX_PGE |
		    CPUID_AMD_EDX_PAT | CPUID_AMD_EDX_PSE36 |
		    CPUID_AMD_EDX_SYSC | CPUID_INTC_EDX_SEP |
		    CPUID_AMD_EDX_TSCP);
		cp->cp_ecx &= ~CPUID_AMD_ECX_CMP_LGCY;
		break;
	default:
		break;
	}

	switch (vendor) {
	case X86_VENDOR_Intel:
		switch (eax) {
		case 4:
			/*
			 * Zero out the (ncores-per-chip - 1) field
			 */
			cp->cp_eax &= 0x03fffffff;
			break;
		default:
			break;
		}
		break;
	case X86_VENDOR_AMD:
		switch (eax) {
		case 0x80000008:
			/*
			 * Zero out the (ncores-per-chip - 1) field
			 */
			cp->cp_ecx &= 0xffffff00;
			break;
		default:
			break;
		}
		break;
	default:
		break;
	}
}
#else
#define	platform_cpuid_mangle(vendor, eax, cp)	/* nothing */
#endif

/*
 *  Some undocumented ways of patching the results of the cpuid
 *  instruction to permit running Solaris 10 on future cpus that
 *  we don't currently support.  Could be set to non-zero values
 *  via settings in eeprom.
 */

uint32_t cpuid_feature_ecx_include;
uint32_t cpuid_feature_ecx_exclude;
uint32_t cpuid_feature_edx_include;
uint32_t cpuid_feature_edx_exclude;

void
cpuid_alloc_space(cpu_t *cpu)
{
	/*
	 * By convention, cpu0 is the boot cpu, which is set up
	 * before memory allocation is available.  All other cpus get
	 * their cpuid_info struct allocated here.
	 */
	ASSERT(cpu->cpu_id != 0);
	cpu->cpu_m.mcpu_cpi =
	    kmem_zalloc(sizeof (*cpu->cpu_m.mcpu_cpi), KM_SLEEP);
}

void
cpuid_free_space(cpu_t *cpu)
{
	struct cpuid_info *cpi = cpu->cpu_m.mcpu_cpi;
	int i;

	ASSERT(cpu->cpu_id != 0);

	/*
	 * Free up any function 4 related dynamic storage
	 */
	for (i = 1; i < cpi->cpi_std_4_size; i++)
		kmem_free(cpi->cpi_std_4[i], sizeof (struct cpuid_regs));
	if (cpi->cpi_std_4_size > 0)
		kmem_free(cpi->cpi_std_4,
		    cpi->cpi_std_4_size * sizeof (struct cpuid_regs *));

	kmem_free(cpu->cpu_m.mcpu_cpi, sizeof (*cpu->cpu_m.mcpu_cpi));
}

#if !defined(__xpv)

static void
check_for_hvm()
{
	struct cpuid_regs cp;
	char *xen_str;
	uint32_t xen_signature[4];
	extern int xpv_is_hvm;

	/*
	 * In a fully virtualized domain, Xen's pseudo-cpuid function
	 * 0x40000000 returns a string representing the Xen signature in
	 * %ebx, %ecx, and %edx.  %eax contains the maximum supported cpuid
	 * function.
	 */
	cp.cp_eax = 0x40000000;
	(void) __cpuid_insn(&cp);
	xen_signature[0] = cp.cp_ebx;
	xen_signature[1] = cp.cp_ecx;
	xen_signature[2] = cp.cp_edx;
	xen_signature[3] = 0;
	xen_str = (char *)xen_signature;
	if (strcmp("XenVMMXenVMM", xen_str) == 0 && cp.cp_eax <= 0x40000002)
		xpv_is_hvm = 1;
}
#endif	/* __xpv */

uint_t
cpuid_pass1(cpu_t *cpu)
{
	uint32_t mask_ecx, mask_edx;
	uint_t feature = X86_CPUID;
	struct cpuid_info *cpi;
	struct cpuid_regs *cp;
	int xcpuid;
#if !defined(__xpv)
	extern int idle_cpu_prefer_mwait;
#endif

	/*
	 * Space statically allocated for cpu0, ensure pointer is set
	 */
	if (cpu->cpu_id == 0)
		cpu->cpu_m.mcpu_cpi = &cpuid_info0;
	cpi = cpu->cpu_m.mcpu_cpi;
	ASSERT(cpi != NULL);
	cp = &cpi->cpi_std[0];
	cp->cp_eax = 0;
	cpi->cpi_maxeax = __cpuid_insn(cp);
	{
		uint32_t *iptr = (uint32_t *)cpi->cpi_vendorstr;
		*iptr++ = cp->cp_ebx;
		*iptr++ = cp->cp_edx;
		*iptr++ = cp->cp_ecx;
		*(char *)&cpi->cpi_vendorstr[12] = '\0';
	}

	/*
	 * Map the vendor string to a type code
	 */
	if (strcmp(cpi->cpi_vendorstr, "GenuineIntel") == 0)
		cpi->cpi_vendor = X86_VENDOR_Intel;
	else if (strcmp(cpi->cpi_vendorstr, "AuthenticAMD") == 0)
		cpi->cpi_vendor = X86_VENDOR_AMD;
	else if (strcmp(cpi->cpi_vendorstr, "GenuineTMx86") == 0)
		cpi->cpi_vendor = X86_VENDOR_TM;
	else if (strcmp(cpi->cpi_vendorstr, CyrixInstead) == 0)
		/*
		 * CyrixInstead is a variable used by the Cyrix detection code
		 * in locore.
		 */
		cpi->cpi_vendor = X86_VENDOR_Cyrix;
	else if (strcmp(cpi->cpi_vendorstr, "UMC UMC UMC ") == 0)
		cpi->cpi_vendor = X86_VENDOR_UMC;
	else if (strcmp(cpi->cpi_vendorstr, "NexGenDriven") == 0)
		cpi->cpi_vendor = X86_VENDOR_NexGen;
	else if (strcmp(cpi->cpi_vendorstr, "CentaurHauls") == 0)
		cpi->cpi_vendor = X86_VENDOR_Centaur;
	else if (strcmp(cpi->cpi_vendorstr, "RiseRiseRise") == 0)
		cpi->cpi_vendor = X86_VENDOR_Rise;
	else if (strcmp(cpi->cpi_vendorstr, "SiS SiS SiS ") == 0)
		cpi->cpi_vendor = X86_VENDOR_SiS;
	else if (strcmp(cpi->cpi_vendorstr, "Geode by NSC") == 0)
		cpi->cpi_vendor = X86_VENDOR_NSC;
	else
		cpi->cpi_vendor = X86_VENDOR_IntelClone;

	x86_vendor = cpi->cpi_vendor; /* for compatibility */

	/*
	 * Limit the range in case of weird hardware
	 */
	if (cpi->cpi_maxeax > CPI_MAXEAX_MAX)
		cpi->cpi_maxeax = CPI_MAXEAX_MAX;
	if (cpi->cpi_maxeax < 1)
		goto pass1_done;

	cp = &cpi->cpi_std[1];
	cp->cp_eax = 1;
	(void) __cpuid_insn(cp);

	/*
	 * Extract identifying constants for easy access.
	 */
	cpi->cpi_model = CPI_MODEL(cpi);
	cpi->cpi_family = CPI_FAMILY(cpi);

	if (cpi->cpi_family == 0xf)
		cpi->cpi_family += CPI_FAMILY_XTD(cpi);

	/*
	 * Beware: AMD uses "extended model" iff base *FAMILY* == 0xf.
	 * Intel, and presumably everyone else, uses model == 0xf, as
	 * one would expect (max value means possible overflow).  Sigh.
	 */

	switch (cpi->cpi_vendor) {
	case X86_VENDOR_Intel:
		if (IS_EXTENDED_MODEL_INTEL(cpi))
			cpi->cpi_model += CPI_MODEL_XTD(cpi) << 4;
		break;
	case X86_VENDOR_AMD:
		if (CPI_FAMILY(cpi) == 0xf)
			cpi->cpi_model += CPI_MODEL_XTD(cpi) << 4;
		break;
	default:
		if (cpi->cpi_model == 0xf)
			cpi->cpi_model += CPI_MODEL_XTD(cpi) << 4;
		break;
	}

	cpi->cpi_step = CPI_STEP(cpi);
	cpi->cpi_brandid = CPI_BRANDID(cpi);

	/*
	 * *default* assumptions:
	 * - believe %edx feature word
	 * - ignore %ecx feature word
	 * - 32-bit virtual and physical addressing
	 */
	mask_edx = 0xffffffff;
	mask_ecx = 0;

	cpi->cpi_pabits = cpi->cpi_vabits = 32;

	switch (cpi->cpi_vendor) {
	case X86_VENDOR_Intel:
		if (cpi->cpi_family == 5)
			x86_type = X86_TYPE_P5;
		else if (IS_LEGACY_P6(cpi)) {
			x86_type = X86_TYPE_P6;
			pentiumpro_bug4046376 = 1;
			pentiumpro_bug4064495 = 1;
			/*
			 * Clear the SEP bit when it was set erroneously
			 */
			if (cpi->cpi_model < 3 && cpi->cpi_step < 3)
				cp->cp_edx &= ~CPUID_INTC_EDX_SEP;
		} else if (IS_NEW_F6(cpi) || cpi->cpi_family == 0xf) {
			x86_type = X86_TYPE_P4;
			/*
			 * We don't currently depend on any of the %ecx
			 * features until Prescott, so we'll only check
			 * this from P4 onwards.  We might want to revisit
			 * that idea later.
			 */
			mask_ecx = 0xffffffff;
		} else if (cpi->cpi_family > 0xf)
			mask_ecx = 0xffffffff;
		/*
		 * We don't support MONITOR/MWAIT if leaf 5 is not available
		 * to obtain the monitor linesize.
		 */
		if (cpi->cpi_maxeax < 5)
			mask_ecx &= ~CPUID_INTC_ECX_MON;
		break;
	case X86_VENDOR_IntelClone:
	default:
		break;
	case X86_VENDOR_AMD:
#if defined(OPTERON_ERRATUM_108)
		if (cpi->cpi_family == 0xf && cpi->cpi_model == 0xe) {
			cp->cp_eax = (0xf0f & cp->cp_eax) | 0xc0;
			cpi->cpi_model = 0xc;
		} else
#endif
		if (cpi->cpi_family == 5) {
			/*
			 * AMD K5 and K6
			 *
			 * These CPUs have an incomplete implementation
			 * of MCA/MCE which we mask away.
			 */
			mask_edx &= ~(CPUID_INTC_EDX_MCE | CPUID_INTC_EDX_MCA);

			/*
			 * Model 0 uses the wrong (APIC) bit
			 * to indicate PGE.  Fix it here.
			 */
			if (cpi->cpi_model == 0) {
				if (cp->cp_edx & 0x200) {
					cp->cp_edx &= ~0x200;
					cp->cp_edx |= CPUID_INTC_EDX_PGE;
				}
			}

			/*
			 * Early models had problems w/ MMX; disable.
			 */
			if (cpi->cpi_model < 6)
				mask_edx &= ~CPUID_INTC_EDX_MMX;
		}

		/*
		 * For newer families, SSE3 and CX16, at least, are valid;
		 * enable all
		 */
		if (cpi->cpi_family >= 0xf)
			mask_ecx = 0xffffffff;
		/*
		 * We don't support MONITOR/MWAIT if leaf 5 is not available
		 * to obtain the monitor linesize.
		 */
		if (cpi->cpi_maxeax < 5)
			mask_ecx &= ~CPUID_INTC_ECX_MON;

#if !defined(__xpv)
		/*
		 * Do not use MONITOR/MWAIT to halt in the idle loop on any AMD
		 * processors.  AMD does not intend MWAIT to be used in the cpu
		 * idle loop on current and future processors.  10h and future
		 * AMD processors use more power in MWAIT than HLT.
		 * Pre-family-10h Opterons do not have the MWAIT instruction.
		 */
		idle_cpu_prefer_mwait = 0;
#endif

		break;
	case X86_VENDOR_TM:
		/*
		 * workaround the NT workaround in CMS 4.1
		 */
		if (cpi->cpi_family == 5 && cpi->cpi_model == 4 &&
		    (cpi->cpi_step == 2 || cpi->cpi_step == 3))
			cp->cp_edx |= CPUID_INTC_EDX_CX8;
		break;
	case X86_VENDOR_Centaur:
		/*
		 * workaround the NT workarounds again
		 */
		if (cpi->cpi_family == 6)
			cp->cp_edx |= CPUID_INTC_EDX_CX8;
		break;
	case X86_VENDOR_Cyrix:
		/*
		 * We rely heavily on the probing in locore
		 * to actually figure out what parts, if any,
		 * of the Cyrix cpuid instruction to believe.
		 */
		switch (x86_type) {
		case X86_TYPE_CYRIX_486:
			mask_edx = 0;
			break;
		case X86_TYPE_CYRIX_6x86:
			mask_edx = 0;
			break;
		case X86_TYPE_CYRIX_6x86L:
			mask_edx =
			    CPUID_INTC_EDX_DE |
			    CPUID_INTC_EDX_CX8;
			break;
		case X86_TYPE_CYRIX_6x86MX:
			mask_edx =
			    CPUID_INTC_EDX_DE |
			    CPUID_INTC_EDX_MSR |
			    CPUID_INTC_EDX_CX8 |
			    CPUID_INTC_EDX_PGE |
			    CPUID_INTC_EDX_CMOV |
			    CPUID_INTC_EDX_MMX;
			break;
		case X86_TYPE_CYRIX_GXm:
			mask_edx =
			    CPUID_INTC_EDX_MSR |
			    CPUID_INTC_EDX_CX8 |
			    CPUID_INTC_EDX_CMOV |
			    CPUID_INTC_EDX_MMX;
			break;
		case X86_TYPE_CYRIX_MediaGX:
			break;
		case X86_TYPE_CYRIX_MII:
		case X86_TYPE_VIA_CYRIX_III:
			mask_edx =
			    CPUID_INTC_EDX_DE |
			    CPUID_INTC_EDX_TSC |
			    CPUID_INTC_EDX_MSR |
			    CPUID_INTC_EDX_CX8 |
			    CPUID_INTC_EDX_PGE |
			    CPUID_INTC_EDX_CMOV |
			    CPUID_INTC_EDX_MMX;
			break;
		default:
			break;
		}
		break;
	}

#if defined(__xpv)
	/*
	 * Do not support MONITOR/MWAIT under a hypervisor
	 */
	mask_ecx &= ~CPUID_INTC_ECX_MON;
#endif	/* __xpv */

	/*
	 * Now we've figured out the masks that determine
	 * which bits we choose to believe, apply the masks
	 * to the feature words, then map the kernel's view
	 * of these feature words into its feature word.
	 */
	cp->cp_edx &= mask_edx;
	cp->cp_ecx &= mask_ecx;

	/*
	 * apply any platform restrictions (we don't call this
	 * immediately after __cpuid_insn here, because we need the
	 * workarounds applied above first)
	 */
	platform_cpuid_mangle(cpi->cpi_vendor, 1, cp);

	/*
	 * fold in overrides from the "eeprom" mechanism
	 */
	cp->cp_edx |= cpuid_feature_edx_include;
	cp->cp_edx &= ~cpuid_feature_edx_exclude;

	cp->cp_ecx |= cpuid_feature_ecx_include;
	cp->cp_ecx &= ~cpuid_feature_ecx_exclude;

	if (cp->cp_edx & CPUID_INTC_EDX_PSE)
		feature |= X86_LARGEPAGE;
	if (cp->cp_edx & CPUID_INTC_EDX_TSC)
		feature |= X86_TSC;
	if (cp->cp_edx & CPUID_INTC_EDX_MSR)
		feature |= X86_MSR;
	if (cp->cp_edx & CPUID_INTC_EDX_MTRR)
		feature |= X86_MTRR;
	if (cp->cp_edx & CPUID_INTC_EDX_PGE)
		feature |= X86_PGE;
	if (cp->cp_edx & CPUID_INTC_EDX_CMOV)
		feature |= X86_CMOV;
	if (cp->cp_edx & CPUID_INTC_EDX_MMX)
		feature |= X86_MMX;
	if ((cp->cp_edx & CPUID_INTC_EDX_MCE) != 0 &&
	    (cp->cp_edx & CPUID_INTC_EDX_MCA) != 0)
		feature |= X86_MCA;
	if (cp->cp_edx & CPUID_INTC_EDX_PAE)
		feature |= X86_PAE;
	if (cp->cp_edx & CPUID_INTC_EDX_CX8)
		feature |= X86_CX8;
	if (cp->cp_ecx & CPUID_INTC_ECX_CX16)
		feature |= X86_CX16;
	if (cp->cp_edx & CPUID_INTC_EDX_PAT)
		feature |= X86_PAT;
	if (cp->cp_edx & CPUID_INTC_EDX_SEP)
		feature |= X86_SEP;
	if (cp->cp_edx & CPUID_INTC_EDX_FXSR) {
		/*
		 * In our implementation, fxsave/fxrstor
		 * are prerequisites before we'll even
		 * try and do SSE things.
		 */
		if (cp->cp_edx & CPUID_INTC_EDX_SSE)
			feature |= X86_SSE;
		if (cp->cp_edx & CPUID_INTC_EDX_SSE2)
			feature |= X86_SSE2;
		if (cp->cp_ecx & CPUID_INTC_ECX_SSE3)
			feature |= X86_SSE3;
		if (cpi->cpi_vendor == X86_VENDOR_Intel) {
			if (cp->cp_ecx & CPUID_INTC_ECX_SSSE3)
				feature |= X86_SSSE3;
			if (cp->cp_ecx & CPUID_INTC_ECX_SSE4_1)
				feature |= X86_SSE4_1;
			if (cp->cp_ecx & CPUID_INTC_ECX_SSE4_2)
				feature |= X86_SSE4_2;
		}
	}
	if (cp->cp_edx & CPUID_INTC_EDX_DE)
		feature |= X86_DE;
	if (cp->cp_ecx & CPUID_INTC_ECX_MON) {
		cpi->cpi_mwait.support |= MWAIT_SUPPORT;
		feature |= X86_MWAIT;
	}

	if (feature & X86_PAE)
		cpi->cpi_pabits = 36;

	/*
	 * Hyperthreading configuration is slightly tricky on Intel
	 * and pure clones, and even trickier on AMD.
	 *
	 * (AMD chose to set the HTT bit on their CMP processors,
	 * even though they're not actually hyperthreaded.  Thus it
	 * takes a bit more work to figure out what's really going
	 * on ... see the handling of the CMP_LGCY bit below)
	 */
	if (cp->cp_edx & CPUID_INTC_EDX_HTT) {
		cpi->cpi_ncpu_per_chip = CPI_CPU_COUNT(cpi);
		if (cpi->cpi_ncpu_per_chip > 1)
			feature |= X86_HTT;
	} else {
		cpi->cpi_ncpu_per_chip = 1;
	}

	/*
	 * Work on the "extended" feature information, doing
	 * some basic initialization for cpuid_pass2()
	 */
	xcpuid = 0;
	switch (cpi->cpi_vendor) {
	case X86_VENDOR_Intel:
		if (IS_NEW_F6(cpi) || cpi->cpi_family >= 0xf)
			xcpuid++;
		break;
	case X86_VENDOR_AMD:
		if (cpi->cpi_family > 5 ||
		    (cpi->cpi_family == 5 && cpi->cpi_model >= 1))
			xcpuid++;
		break;
	case X86_VENDOR_Cyrix:
		/*
		 * Only these Cyrix CPUs are -known- to support
		 * extended cpuid operations.
		 */
		if (x86_type == X86_TYPE_VIA_CYRIX_III ||
		    x86_type == X86_TYPE_CYRIX_GXm)
			xcpuid++;
		break;
	case X86_VENDOR_Centaur:
	case X86_VENDOR_TM:
	default:
		xcpuid++;
		break;
	}

	if (xcpuid) {
		cp = &cpi->cpi_extd[0];
		cp->cp_eax = 0x80000000;
		cpi->cpi_xmaxeax = __cpuid_insn(cp);
	}

	if (cpi->cpi_xmaxeax & 0x80000000) {

		if (cpi->cpi_xmaxeax > CPI_XMAXEAX_MAX)
			cpi->cpi_xmaxeax = CPI_XMAXEAX_MAX;

		switch (cpi->cpi_vendor) {
		case X86_VENDOR_Intel:
		case X86_VENDOR_AMD:
			if (cpi->cpi_xmaxeax < 0x80000001)
				break;
			cp = &cpi->cpi_extd[1];
			cp->cp_eax = 0x80000001;
			(void) __cpuid_insn(cp);

			if (cpi->cpi_vendor == X86_VENDOR_AMD &&
			    cpi->cpi_family == 5 &&
			    cpi->cpi_model == 6 &&
			    cpi->cpi_step == 6) {
				/*
				 * K6 model 6 uses bit 10 to indicate SYSC
				 * Later models use bit 11. Fix it here.
				 */
				if (cp->cp_edx & 0x400) {
					cp->cp_edx &= ~0x400;
					cp->cp_edx |= CPUID_AMD_EDX_SYSC;
				}
			}

			platform_cpuid_mangle(cpi->cpi_vendor, 0x80000001, cp);

			/*
			 * Compute the additions to the kernel's feature word.
			 */
			if (cp->cp_edx & CPUID_AMD_EDX_NX)
				feature |= X86_NX;

#if defined(__amd64)
			/* 1 GB large page - enable only for 64 bit kernel */
			if (cp->cp_edx & CPUID_AMD_EDX_1GPG)
				feature |= X86_1GPG;
#endif

			if ((cpi->cpi_vendor == X86_VENDOR_AMD) &&
			    (cpi->cpi_std[1].cp_edx & CPUID_INTC_EDX_FXSR) &&
			    (cp->cp_ecx & CPUID_AMD_ECX_SSE4A))
				feature |= X86_SSE4A;

			/*
			 * If both the HTT and CMP_LGCY bits are set,
			 * then we're not actually HyperThreaded.  Read
			 * "AMD CPUID Specification" for more details.
			 */
			if (cpi->cpi_vendor == X86_VENDOR_AMD &&
			    (feature & X86_HTT) &&
			    (cp->cp_ecx & CPUID_AMD_ECX_CMP_LGCY)) {
				feature &= ~X86_HTT;
				feature |= X86_CMP;
			}
#if defined(__amd64)
			/*
			 * It's really tricky to support syscall/sysret in
			 * the i386 kernel; we rely on sysenter/sysexit
			 * instead.  In the amd64 kernel, things are -way-
			 * better.
			 */
			if (cp->cp_edx & CPUID_AMD_EDX_SYSC)
				feature |= X86_ASYSC;

			/*
			 * While we're thinking about system calls, note
			 * that AMD processors don't support sysenter
			 * in long mode at all, so don't try to program them.
			 */
			if (x86_vendor == X86_VENDOR_AMD)
				feature &= ~X86_SEP;
#endif
			if (cp->cp_edx & CPUID_AMD_EDX_TSCP)
				feature |= X86_TSCP;
			break;
		default:
			break;
		}

		/*
		 * Get CPUID data about processor cores and hyperthreads.
		 */
		switch (cpi->cpi_vendor) {
		case X86_VENDOR_Intel:
			if (cpi->cpi_maxeax >= 4) {
				cp = &cpi->cpi_std[4];
				cp->cp_eax = 4;
				cp->cp_ecx = 0;
				(void) __cpuid_insn(cp);
				platform_cpuid_mangle(cpi->cpi_vendor, 4, cp);
			}
			/*FALLTHROUGH*/
		case X86_VENDOR_AMD:
			if (cpi->cpi_xmaxeax < 0x80000008)
				break;
			cp = &cpi->cpi_extd[8];
			cp->cp_eax = 0x80000008;
			(void) __cpuid_insn(cp);
			platform_cpuid_mangle(cpi->cpi_vendor, 0x80000008, cp);

			/*
			 * Virtual and physical address limits from
			 * cpuid override previously guessed values.
			 */
			cpi->cpi_pabits = BITX(cp->cp_eax, 7, 0);
			cpi->cpi_vabits = BITX(cp->cp_eax, 15, 8);
			break;
		default:
			break;
		}

		/*
		 * Derive the number of cores per chip
		 */
		switch (cpi->cpi_vendor) {
		case X86_VENDOR_Intel:
			if (cpi->cpi_maxeax < 4) {
				cpi->cpi_ncore_per_chip = 1;
				break;
			} else {
				cpi->cpi_ncore_per_chip =
				    BITX((cpi)->cpi_std[4].cp_eax, 31, 26) + 1;
			}
			break;
		case X86_VENDOR_AMD:
			if (cpi->cpi_xmaxeax < 0x80000008) {
				cpi->cpi_ncore_per_chip = 1;
				break;
			} else {
				/*
				 * On family 0xf cpuid fn 2 ECX[7:0] "NC" is
				 * 1 less than the number of physical cores on
				 * the chip.  In family 0x10 this value can
				 * be affected by "downcoring" - it reflects
				 * 1 less than the number of cores actually
				 * enabled on this node.
				 */
				cpi->cpi_ncore_per_chip =
				    BITX((cpi)->cpi_extd[8].cp_ecx, 7, 0) + 1;
			}
			break;
		default:
			cpi->cpi_ncore_per_chip = 1;
			break;
		}
	} else {
		cpi->cpi_ncore_per_chip = 1;
	}

	/*
	 * If more than one core, then this processor is CMP.
	 */
	if (cpi->cpi_ncore_per_chip > 1)
		feature |= X86_CMP;

	/*
	 * If the number of cores is the same as the number
	 * of CPUs, then we cannot have HyperThreading.
	 */
	if (cpi->cpi_ncpu_per_chip == cpi->cpi_ncore_per_chip)
		feature &= ~X86_HTT;

	if ((feature & (X86_HTT | X86_CMP)) == 0) {
		/*
		 * Single-core single-threaded processors.
		 */
		cpi->cpi_chipid = -1;
		cpi->cpi_clogid = 0;
		cpi->cpi_coreid = cpu->cpu_id;
		cpi->cpi_pkgcoreid = 0;
	} else if (cpi->cpi_ncpu_per_chip > 1) {
		uint_t i;
		uint_t chipid_shift = 0;
		uint_t coreid_shift = 0;
		uint_t apic_id = CPI_APIC_ID(cpi);

		for (i = 1; i < cpi->cpi_ncpu_per_chip; i <<= 1)
			chipid_shift++;
		cpi->cpi_chipid = apic_id >> chipid_shift;
		cpi->cpi_clogid = apic_id & ((1 << chipid_shift) - 1);

		if (cpi->cpi_vendor == X86_VENDOR_Intel) {
			if (feature & X86_CMP) {
				/*
				 * Multi-core (and possibly multi-threaded)
				 * processors.
				 */
				uint_t ncpu_per_core;
				if (cpi->cpi_ncore_per_chip == 1)
					ncpu_per_core = cpi->cpi_ncpu_per_chip;
				else if (cpi->cpi_ncore_per_chip > 1)
					ncpu_per_core = cpi->cpi_ncpu_per_chip /
					    cpi->cpi_ncore_per_chip;
				/*
				 * 8bit APIC IDs on dual core Pentiums
				 * look like this:
				 *
				 * +-----------------------+------+------+
				 * | Physical Package ID   |  MC  |  HT  |
				 * +-----------------------+------+------+
				 * <------- chipid -------->
				 * <------- coreid --------------->
				 *			   <--- clogid -->
				 *			   <------>
				 *			   pkgcoreid
				 *
				 * Where the number of bits necessary to
				 * represent MC and HT fields together equals
				 * to the minimum number of bits necessary to
				 * store the value of cpi->cpi_ncpu_per_chip.
				 * Of those bits, the MC part uses the number
				 * of bits necessary to store the value of
				 * cpi->cpi_ncore_per_chip.
				 */
				for (i = 1; i < ncpu_per_core; i <<= 1)
					coreid_shift++;
				cpi->cpi_coreid = apic_id >> coreid_shift;
				cpi->cpi_pkgcoreid = cpi->cpi_clogid >>
				    coreid_shift;
			} else if (feature & X86_HTT) {
				/*
				 * Single-core multi-threaded processors.
				 */
				cpi->cpi_coreid = cpi->cpi_chipid;
				cpi->cpi_pkgcoreid = 0;
			}
		} else if (cpi->cpi_vendor == X86_VENDOR_AMD) {
			/*
			 * AMD CMP chips currently have a single thread per
			 * core, with 2 cores on family 0xf and 2, 3 or 4
			 * cores on family 0x10.
			 *
			 * Since no two cpus share a core we must assign a
			 * distinct coreid per cpu, and we do this by using
			 * the cpu_id.  This scheme does not, however,
			 * guarantee that sibling cores of a chip will have
			 * sequential coreids starting at a multiple of the
			 * number of cores per chip - that is usually the
			 * case, but if the ACPI MADT table is presented
			 * in a different order then we need to perform a
			 * few more gymnastics for the pkgcoreid.
			 *
			 * In family 0xf CMPs there are 2 cores on all nodes
			 * present - no mixing of single and dual core parts.
			 *
			 * In family 0x10 CMPs cpuid fn 2 ECX[15:12]
			 * "ApicIdCoreIdSize[3:0]" tells us how
			 * many least-significant bits in the ApicId
			 * are used to represent the core number
			 * within the node.  Cores are always
			 * numbered sequentially from 0 regardless
			 * of how many or which are disabled, and
			 * there seems to be no way to discover the
			 * real core id when some are disabled.
			 */
			cpi->cpi_coreid = cpu->cpu_id;

			if (cpi->cpi_family == 0x10 &&
			    cpi->cpi_xmaxeax >= 0x80000008) {
				int coreidsz =
				    BITX((cpi)->cpi_extd[8].cp_ecx, 15, 12);

				cpi->cpi_pkgcoreid =
				    apic_id & ((1 << coreidsz) - 1);
			} else {
				cpi->cpi_pkgcoreid = cpi->cpi_clogid;
			}
		} else {
			/*
			 * All other processors are currently
			 * assumed to have single cores.
			 */
			cpi->cpi_coreid = cpi->cpi_chipid;
			cpi->cpi_pkgcoreid = 0;
		}
	}

	/*
	 * Synthesize chip "revision" and socket type
	 */
	synth_info(cpi);

pass1_done:
#if !defined(__xpv)
	check_for_hvm();
#endif
	cpi->cpi_pass = 1;
	return (feature);
}

/*
 * Make copies of the cpuid table entries we depend on, in
 * part for ease of parsing now, in part so that we have only
 * one place to correct any of it, in part for ease of
 * later export to userland, and in part so we can look at
 * this stuff in a crash dump.
 */

/*ARGSUSED*/
void
cpuid_pass2(cpu_t *cpu)
{
	uint_t n, nmax;
	int i;
	struct cpuid_regs *cp;
	uint8_t *dp;
	uint32_t *iptr;
	struct cpuid_info *cpi = cpu->cpu_m.mcpu_cpi;

	ASSERT(cpi->cpi_pass == 1);

	if (cpi->cpi_maxeax < 1)
		goto pass2_done;

	if ((nmax = cpi->cpi_maxeax + 1) > NMAX_CPI_STD)
		nmax = NMAX_CPI_STD;
	/*
	 * (We already handled n == 0 and n == 1 in pass 1)
	 */
	for (n = 2, cp = &cpi->cpi_std[2]; n < nmax; n++, cp++) {
		cp->cp_eax = n;

		/*
		 * CPUID function 4 expects %ecx to be initialized
		 * with an index which indicates which cache to return
		 * information about. The OS is expected to call function 4
		 * with %ecx set to 0, 1, 2, ... until it returns with
		 * EAX[4:0] set to 0, which indicates there are no more
		 * caches.
		 *
		 * Here, populate cpi_std[4] with the information returned by
		 * function 4 when %ecx == 0, and do the rest in cpuid_pass3()
		 * when dynamic memory allocation becomes available.
		 *
		 * Note: we need to explicitly initialize %ecx here, since
		 * function 4 may have been previously invoked.
		 */
		if (n == 4)
			cp->cp_ecx = 0;

		(void) __cpuid_insn(cp);
		platform_cpuid_mangle(cpi->cpi_vendor, n, cp);
		switch (n) {
		case 2:
			/*
			 * "the lower 8 bits of the %eax register
			 * contain a value that identifies the number
			 * of times the cpuid [instruction] has to be
			 * executed to obtain a complete image of the
			 * processor's caching systems."
			 *
			 * How *do* they make this stuff up?
			 */
			cpi->cpi_ncache = sizeof (*cp) *
			    BITX(cp->cp_eax, 7, 0);
			if (cpi->cpi_ncache == 0)
				break;
			cpi->cpi_ncache--;	/* skip count byte */

			/*
			 * Well, for now, rather than attempt to implement
			 * this slightly dubious algorithm, we just look
			 * at the first 15 ..
			 */
			if (cpi->cpi_ncache > (sizeof (*cp) - 1))
				cpi->cpi_ncache = sizeof (*cp) - 1;

			dp = cpi->cpi_cacheinfo;
			if (BITX(cp->cp_eax, 31, 31) == 0) {
				uint8_t *p = (void *)&cp->cp_eax;
				for (i = 1; i < 4; i++)
					if (p[i] != 0)
						*dp++ = p[i];
			}
			if (BITX(cp->cp_ebx, 31, 31) == 0) {
				uint8_t *p = (void *)&cp->cp_ebx;
				for (i = 0; i < 4; i++)
					if (p[i] != 0)
						*dp++ = p[i];
			}
			if (BITX(cp->cp_ecx, 31, 31) == 0) {
				uint8_t *p = (void *)&cp->cp_ecx;
				for (i = 0; i < 4; i++)
					if (p[i] != 0)
						*dp++ = p[i];
			}
			if (BITX(cp->cp_edx, 31, 31) == 0) {
				uint8_t *p = (void *)&cp->cp_edx;
				for (i = 0; i < 4; i++)
					if (p[i] != 0)
						*dp++ = p[i];
			}
			break;

		case 3:	/* Processor serial number, if PSN supported */
			break;

		case 4:	/* Deterministic cache parameters */
			break;

		case 5:	/* Monitor/Mwait parameters */
		{
			size_t mwait_size;

			/*
			 * check cpi_mwait.support which was set in cpuid_pass1
			 */
			if (!(cpi->cpi_mwait.support & MWAIT_SUPPORT))
				break;

			/*
			 * Protect ourself from insane mwait line size.
			 * Workaround for incomplete hardware emulator(s).
			 */
			mwait_size = (size_t)MWAIT_SIZE_MAX(cpi);
			if (mwait_size < sizeof (uint32_t) ||
			    !ISP2(mwait_size)) {
#if DEBUG
				cmn_err(CE_NOTE, "Cannot handle cpu %d mwait "
				    "size %ld",
				    cpu->cpu_id, (long)mwait_size);
#endif
				break;
			}

			cpi->cpi_mwait.mon_min = (size_t)MWAIT_SIZE_MIN(cpi);
			cpi->cpi_mwait.mon_max = mwait_size;
			if (MWAIT_EXTENSION(cpi)) {
				cpi->cpi_mwait.support |= MWAIT_EXTENSIONS;
				if (MWAIT_INT_ENABLE(cpi))
					cpi->cpi_mwait.support |=
					    MWAIT_ECX_INT_ENABLE;
			}
			break;
		}
		default:
			break;
		}
	}

	if ((cpi->cpi_xmaxeax & 0x80000000) == 0)
		goto pass2_done;

	if ((nmax = cpi->cpi_xmaxeax - 0x80000000 + 1) > NMAX_CPI_EXTD)
		nmax = NMAX_CPI_EXTD;
	/*
	 * Copy the extended properties, fixing them as we go.
	 * (We already handled n == 0 and n == 1 in pass 1)
	 */
	iptr = (void *)cpi->cpi_brandstr;
	for (n = 2, cp = &cpi->cpi_extd[2]; n < nmax; cp++, n++) {
		cp->cp_eax = 0x80000000 + n;
		(void) __cpuid_insn(cp);
		platform_cpuid_mangle(cpi->cpi_vendor, 0x80000000 + n, cp);
		switch (n) {
		case 2:
		case 3:
		case 4:
			/*
			 * Extract the brand string
			 */
			*iptr++ = cp->cp_eax;
			*iptr++ = cp->cp_ebx;
			*iptr++ = cp->cp_ecx;
			*iptr++ = cp->cp_edx;
			break;
		case 5:
			switch (cpi->cpi_vendor) {
			case X86_VENDOR_AMD:
				/*
				 * The Athlon and Duron were the first
				 * parts to report the sizes of the
				 * TLB for large pages. Before then,
				 * we don't trust the data.
				 */
				if (cpi->cpi_family < 6 ||
				    (cpi->cpi_family == 6 &&
				    cpi->cpi_model < 1))
					cp->cp_eax = 0;
				break;
			default:
				break;
			}
			break;
		case 6:
			switch (cpi->cpi_vendor) {
			case X86_VENDOR_AMD:
				/*
				 * The Athlon and Duron were the first
				 * AMD parts with L2 TLB's.
				 * Before then, don't trust the data.
				 */
				if (cpi->cpi_family < 6 ||
				    cpi->cpi_family == 6 &&
				    cpi->cpi_model < 1)
					cp->cp_eax = cp->cp_ebx = 0;
				/*
				 * AMD Duron rev A0 reports L2
				 * cache size incorrectly as 1K
				 * when it is really 64K
				 */
				if (cpi->cpi_family == 6 &&
				    cpi->cpi_model == 3 &&
				    cpi->cpi_step == 0) {
					cp->cp_ecx &= 0xffff;
					cp->cp_ecx |= 0x400000;
				}
				break;
			case X86_VENDOR_Cyrix:	/* VIA C3 */
				/*
				 * VIA C3 processors are a bit messed
				 * up w.r.t. encoding cache sizes in %ecx
				 */
				if (cpi->cpi_family != 6)
					break;
				/*
				 * model 7 and 8 were incorrectly encoded
				 *
				 * xxx is model 8 really broken?
				 */
				if (cpi->cpi_model == 7 ||
				    cpi->cpi_model == 8)
					cp->cp_ecx =
					    BITX(cp->cp_ecx, 31, 24) << 16 |
					    BITX(cp->cp_ecx, 23, 16) << 12 |
					    BITX(cp->cp_ecx, 15, 8) << 8 |
					    BITX(cp->cp_ecx, 7, 0);
				/*
				 * model 9 stepping 1 has wrong associativity
				 */
				if (cpi->cpi_model == 9 && cpi->cpi_step == 1)
					cp->cp_ecx |= 8 << 12;
				break;
			case X86_VENDOR_Intel:
				/*
				 * Extended L2 Cache features function.
				 * First appeared on Prescott.
				 */
			default:
				break;
			}
			break;
		default:
			break;
		}
	}

pass2_done:
	cpi->cpi_pass = 2;
}

static const char *
intel_cpubrand(const struct cpuid_info *cpi)
{
	int i;

	if ((x86_feature & X86_CPUID) == 0 ||
	    cpi->cpi_maxeax < 1 || cpi->cpi_family < 5)
		return ("i486");

	switch (cpi->cpi_family) {
	case 5:
		return ("Intel Pentium(r)");
	case 6:
		switch (cpi->cpi_model) {
			uint_t celeron, xeon;
			const struct cpuid_regs *cp;
		case 0:
		case 1:
		case 2:
			return ("Intel Pentium(r) Pro");
		case 3:
		case 4:
			return ("Intel Pentium(r) II");
		case 6:
			return ("Intel Celeron(r)");
		case 5:
		case 7:
			celeron = xeon = 0;
			cp = &cpi->cpi_std[2];	/* cache info */

			for (i = 1; i < 4; i++) {
				uint_t tmp;

				tmp = (cp->cp_eax >> (8 * i)) & 0xff;
				if (tmp == 0x40)
					celeron++;
				if (tmp >= 0x44 && tmp <= 0x45)
					xeon++;
			}

			for (i = 0; i < 2; i++) {
				uint_t tmp;

				tmp = (cp->cp_ebx >> (8 * i)) & 0xff;
				if (tmp == 0x40)
					celeron++;
				else if (tmp >= 0x44 && tmp <= 0x45)
					xeon++;
			}

			for (i = 0; i < 4; i++) {
				uint_t tmp;

				tmp = (cp->cp_ecx >> (8 * i)) & 0xff;
				if (tmp == 0x40)
					celeron++;
				else if (tmp >= 0x44 && tmp <= 0x45)
					xeon++;
			}

			for (i = 0; i < 4; i++) {
				uint_t tmp;

				tmp = (cp->cp_edx >> (8 * i)) & 0xff;
				if (tmp == 0x40)
					celeron++;
				else if (tmp >= 0x44 && tmp <= 0x45)
					xeon++;
			}

			if (celeron)
				return ("Intel Celeron(r)");
			if (xeon)
				return (cpi->cpi_model == 5 ?
				    "Intel Pentium(r) II Xeon(tm)" :
				    "Intel Pentium(r) III Xeon(tm)");
			return (cpi->cpi_model == 5 ?
			    "Intel Pentium(r) II or Pentium(r) II Xeon(tm)" :
			    "Intel Pentium(r) III or Pentium(r) III Xeon(tm)");
		default:
			break;
		}
	default:
		break;
	}

	/* BrandID is present if the field is nonzero */
	if (cpi->cpi_brandid != 0) {
		static const struct {
			uint_t bt_bid;
			const char *bt_str;
		} brand_tbl[] = {
			{ 0x1,	"Intel(r) Celeron(r)" },
			{ 0x2,	"Intel(r) Pentium(r) III" },
			{ 0x3,	"Intel(r) Pentium(r) III Xeon(tm)" },
			{ 0x4,	"Intel(r) Pentium(r) III" },
			{ 0x6,	"Mobile Intel(r) Pentium(r) III" },
			{ 0x7,	"Mobile Intel(r) Celeron(r)" },
			{ 0x8,	"Intel(r) Pentium(r) 4" },
			{ 0x9,	"Intel(r) Pentium(r) 4" },
			{ 0xa,	"Intel(r) Celeron(r)" },
			{ 0xb,	"Intel(r) Xeon(tm)" },
			{ 0xc,	"Intel(r) Xeon(tm) MP" },
			{ 0xe,	"Mobile Intel(r) Pentium(r) 4" },
			{ 0xf,	"Mobile Intel(r) Celeron(r)" },
			{ 0x11, "Mobile Genuine Intel(r)" },
			{ 0x12, "Intel(r) Celeron(r) M" },
			{ 0x13, "Mobile Intel(r) Celeron(r)" },
			{ 0x14, "Intel(r) Celeron(r)" },
			{ 0x15, "Mobile Genuine Intel(r)" },
			{ 0x16,	"Intel(r) Pentium(r) M" },
			{ 0x17, "Mobile Intel(r) Celeron(r)" }
		};
		uint_t btblmax = sizeof (brand_tbl) / sizeof (brand_tbl[0]);
		uint_t sgn;

		sgn = (cpi->cpi_family << 8) |
		    (cpi->cpi_model << 4) | cpi->cpi_step;

		for (i = 0; i < btblmax; i++)
			if (brand_tbl[i].bt_bid == cpi->cpi_brandid)
				break;
		if (i < btblmax) {
			if (sgn == 0x6b1 && cpi->cpi_brandid == 3)
				return ("Intel(r) Celeron(r)");
			if (sgn < 0xf13 && cpi->cpi_brandid == 0xb)
				return ("Intel(r) Xeon(tm) MP");
			if (sgn < 0xf13 && cpi->cpi_brandid == 0xe)
				return ("Intel(r) Xeon(tm)");
			return (brand_tbl[i].bt_str);
		}
	}

	return (NULL);
}

static const char *
amd_cpubrand(const struct cpuid_info *cpi)
{
	if ((x86_feature & X86_CPUID) == 0 ||
	    cpi->cpi_maxeax < 1 || cpi->cpi_family < 5)
		return ("i486 compatible");

	switch (cpi->cpi_family) {
	case 5:
		switch (cpi->cpi_model) {
		case 0:
		case 1:
		case 2:
		case 3:
		case 4:
		case 5:
			return ("AMD-K5(r)");
		case 6:
		case 7:
			return ("AMD-K6(r)");
		case 8:
			return ("AMD-K6(r)-2");
		case 9:
			return ("AMD-K6(r)-III");
		default:
			return ("AMD (family 5)");
		}
	case 6:
		switch (cpi->cpi_model) {
		case 1:
			return ("AMD-K7(tm)");
		case 0:
		case 2:
		case 4:
			return ("AMD Athlon(tm)");
		case 3:
		case 7:
			return ("AMD Duron(tm)");
		case 6:
		case 8:
		case 10:
			/*
			 * Use the L2 cache size to distinguish
			 */
			return ((cpi->cpi_extd[6].cp_ecx >> 16) >= 256 ?
			    "AMD Athlon(tm)" : "AMD Duron(tm)");
		default:
			return ("AMD (family 6)");
		}
	default:
		break;
	}

	if (cpi->cpi_family == 0xf && cpi->cpi_model == 5 &&
	    cpi->cpi_brandid != 0) {
		switch (BITX(cpi->cpi_brandid, 7, 5)) {
		case 3:
			return ("AMD Opteron(tm) UP 1xx");
		case 4:
			return ("AMD Opteron(tm) DP 2xx");
		case 5:
			return ("AMD Opteron(tm) MP 8xx");
		default:
			return ("AMD Opteron(tm)");
		}
	}

	return (NULL);
}

static const char *
cyrix_cpubrand(struct cpuid_info *cpi, uint_t type)
{
	if ((x86_feature & X86_CPUID) == 0 ||
	    cpi->cpi_maxeax < 1 || cpi->cpi_family < 5 ||
	    type == X86_TYPE_CYRIX_486)
		return ("i486 compatible");

	switch (type) {
	case X86_TYPE_CYRIX_6x86:
		return ("Cyrix 6x86");
	case X86_TYPE_CYRIX_6x86L:
		return ("Cyrix 6x86L");
	case X86_TYPE_CYRIX_6x86MX:
		return ("Cyrix 6x86MX");
	case X86_TYPE_CYRIX_GXm:
		return ("Cyrix GXm");
	case X86_TYPE_CYRIX_MediaGX:
		return ("Cyrix MediaGX");
	case X86_TYPE_CYRIX_MII:
		return ("Cyrix M2");
	case X86_TYPE_VIA_CYRIX_III:
		return ("VIA Cyrix M3");
	default:
		/*
		 * Have another wild guess ..
		 */
		if (cpi->cpi_family == 4 && cpi->cpi_model == 9)
			return ("Cyrix 5x86");
		else if (cpi->cpi_family == 5) {
			switch (cpi->cpi_model) {
			case 2:
				return ("Cyrix 6x86");	/* Cyrix M1 */
			case 4:
				return ("Cyrix MediaGX");
			default:
				break;
			}
		} else if (cpi->cpi_family == 6) {
			switch (cpi->cpi_model) {
			case 0:
				return ("Cyrix 6x86MX"); /* Cyrix M2? */
			case 5:
			case 6:
			case 7:
			case 8:
			case 9:
				return ("VIA C3");
			default:
				break;
			}
		}
		break;
	}
	return (NULL);
}

/*
 * This only gets called in the case that the CPU extended
 * feature brand string (0x80000002, 0x80000003, 0x80000004)
 * aren't available, or contain null bytes for some reason.
 */
static void
fabricate_brandstr(struct cpuid_info *cpi)
{
	const char *brand = NULL;

	switch (cpi->cpi_vendor) {
	case X86_VENDOR_Intel:
		brand = intel_cpubrand(cpi);
		break;
	case X86_VENDOR_AMD:
		brand = amd_cpubrand(cpi);
		break;
	case X86_VENDOR_Cyrix:
		brand = cyrix_cpubrand(cpi, x86_type);
		break;
	case X86_VENDOR_NexGen:
		if (cpi->cpi_family == 5 && cpi->cpi_model == 0)
			brand = "NexGen Nx586";
		break;
	case X86_VENDOR_Centaur:
		if (cpi->cpi_family == 5)
			switch (cpi->cpi_model) {
			case 4:
				brand = "Centaur C6";
				break;
			case 8:
				brand = "Centaur C2";
				break;
			case 9:
				brand = "Centaur C3";
				break;
			default:
				break;
			}
		break;
	case X86_VENDOR_Rise:
		if (cpi->cpi_family == 5 &&
		    (cpi->cpi_model == 0 || cpi->cpi_model == 2))
			brand = "Rise mP6";
		break;
	case X86_VENDOR_SiS:
		if (cpi->cpi_family == 5 && cpi->cpi_model == 0)
			brand = "SiS 55x";
		break;
	case X86_VENDOR_TM:
		if (cpi->cpi_family == 5 && cpi->cpi_model == 4)
			brand = "Transmeta Crusoe TM3x00 or TM5x00";
		break;
	case X86_VENDOR_NSC:
	case X86_VENDOR_UMC:
	default:
		break;
	}
	if (brand) {
		(void) strcpy((char *)cpi->cpi_brandstr, brand);
		return;
	}

	/*
	 * If all else fails ...
	 */
	(void) snprintf(cpi->cpi_brandstr, sizeof (cpi->cpi_brandstr),
	    "%s %d.%d.%d", cpi->cpi_vendorstr, cpi->cpi_family,
	    cpi->cpi_model, cpi->cpi_step);
}

/*
 * This routine is called just after kernel memory allocation
 * becomes available on cpu0, and as part of mp_startup() on
 * the other cpus.
 *
 * Fixup the brand string, and collect any information from cpuid
 * that requires dynamicically allocated storage to represent.
 */
/*ARGSUSED*/
void
cpuid_pass3(cpu_t *cpu)
{
	int	i, max, shft, level, size;
	struct cpuid_regs regs;
	struct cpuid_regs *cp;
	struct cpuid_info *cpi = cpu->cpu_m.mcpu_cpi;

	ASSERT(cpi->cpi_pass == 2);

	/*
	 * Function 4: Deterministic cache parameters
	 *
	 * Take this opportunity to detect the number of threads
	 * sharing the last level cache, and construct a corresponding
	 * cache id. The respective cpuid_info members are initialized
	 * to the default case of "no last level cache sharing".
	 */
	cpi->cpi_ncpu_shr_last_cache = 1;
	cpi->cpi_last_lvl_cacheid = cpu->cpu_id;

	if (cpi->cpi_maxeax >= 4 && cpi->cpi_vendor == X86_VENDOR_Intel) {

		/*
		 * Find the # of elements (size) returned by fn 4, and along
		 * the way detect last level cache sharing details.
		 */
		bzero(&regs, sizeof (regs));
		cp = &regs;
		for (i = 0, max = 0; i < CPI_FN4_ECX_MAX; i++) {
			cp->cp_eax = 4;
			cp->cp_ecx = i;

			(void) __cpuid_insn(cp);

			if (CPI_CACHE_TYPE(cp) == 0)
				break;
			level = CPI_CACHE_LVL(cp);
			if (level > max) {
				max = level;
				cpi->cpi_ncpu_shr_last_cache =
				    CPI_NTHR_SHR_CACHE(cp) + 1;
			}
		}
		cpi->cpi_std_4_size = size = i;

		/*
		 * Allocate the cpi_std_4 array. The first element
		 * references the regs for fn 4, %ecx == 0, which
		 * cpuid_pass2() stashed in cpi->cpi_std[4].
		 */
		if (size > 0) {
			cpi->cpi_std_4 =
			    kmem_alloc(size * sizeof (cp), KM_SLEEP);
			cpi->cpi_std_4[0] = &cpi->cpi_std[4];

			/*
			 * Allocate storage to hold the additional regs
			 * for function 4, %ecx == 1 .. cpi_std_4_size.
			 *
			 * The regs for fn 4, %ecx == 0 has already
			 * been allocated as indicated above.
			 */
			for (i = 1; i < size; i++) {
				cp = cpi->cpi_std_4[i] =
				    kmem_zalloc(sizeof (regs), KM_SLEEP);
				cp->cp_eax = 4;
				cp->cp_ecx = i;

				(void) __cpuid_insn(cp);
			}
		}
		/*
		 * Determine the number of bits needed to represent
		 * the number of CPUs sharing the last level cache.
		 *
		 * Shift off that number of bits from the APIC id to
		 * derive the cache id.
		 */
		shft = 0;
		for (i = 1; i < cpi->cpi_ncpu_shr_last_cache; i <<= 1)
			shft++;
		cpi->cpi_last_lvl_cacheid = CPI_APIC_ID(cpi) >> shft;
	}

	/*
	 * Now fixup the brand string
	 */
	if ((cpi->cpi_xmaxeax & 0x80000000) == 0) {
		fabricate_brandstr(cpi);
	} else {

		/*
		 * If we successfully extracted a brand string from the cpuid
		 * instruction, clean it up by removing leading spaces and
		 * similar junk.
		 */
		if (cpi->cpi_brandstr[0]) {
			size_t maxlen = sizeof (cpi->cpi_brandstr);
			char *src, *dst;

			dst = src = (char *)cpi->cpi_brandstr;
			src[maxlen - 1] = '\0';
			/*
			 * strip leading spaces
			 */
			while (*src == ' ')
				src++;
			/*
			 * Remove any 'Genuine' or "Authentic" prefixes
			 */
			if (strncmp(src, "Genuine ", 8) == 0)
				src += 8;
			if (strncmp(src, "Authentic ", 10) == 0)
				src += 10;

			/*
			 * Now do an in-place copy.
			 * Map (R) to (r) and (TM) to (tm).
			 * The era of teletypes is long gone, and there's
			 * -really- no need to shout.
			 */
			while (*src != '\0') {
				if (src[0] == '(') {
					if (strncmp(src + 1, "R)", 2) == 0) {
						(void) strncpy(dst, "(r)", 3);
						src += 3;
						dst += 3;
						continue;
					}
					if (strncmp(src + 1, "TM)", 3) == 0) {
						(void) strncpy(dst, "(tm)", 4);
						src += 4;
						dst += 4;
						continue;
					}
				}
				*dst++ = *src++;
			}
			*dst = '\0';

			/*
			 * Finally, remove any trailing spaces
			 */
			while (--dst > cpi->cpi_brandstr)
				if (*dst == ' ')
					*dst = '\0';
				else
					break;
		} else
			fabricate_brandstr(cpi);
	}
	cpi->cpi_pass = 3;
}

/*
 * This routine is called out of bind_hwcap() much later in the life
 * of the kernel (post_startup()).  The job of this routine is to resolve
 * the hardware feature support and kernel support for those features into
 * what we're actually going to tell applications via the aux vector.
 */
uint_t
cpuid_pass4(cpu_t *cpu)
{
	struct cpuid_info *cpi;
	uint_t hwcap_flags = 0;

	if (cpu == NULL)
		cpu = CPU;
	cpi = cpu->cpu_m.mcpu_cpi;

	ASSERT(cpi->cpi_pass == 3);

	if (cpi->cpi_maxeax >= 1) {
		uint32_t *edx = &cpi->cpi_support[STD_EDX_FEATURES];
		uint32_t *ecx = &cpi->cpi_support[STD_ECX_FEATURES];

		*edx = CPI_FEATURES_EDX(cpi);
		*ecx = CPI_FEATURES_ECX(cpi);

		/*
		 * [these require explicit kernel support]
		 */
		if ((x86_feature & X86_SEP) == 0)
			*edx &= ~CPUID_INTC_EDX_SEP;

		if ((x86_feature & X86_SSE) == 0)
			*edx &= ~(CPUID_INTC_EDX_FXSR|CPUID_INTC_EDX_SSE);
		if ((x86_feature & X86_SSE2) == 0)
			*edx &= ~CPUID_INTC_EDX_SSE2;

		if ((x86_feature & X86_HTT) == 0)
			*edx &= ~CPUID_INTC_EDX_HTT;

		if ((x86_feature & X86_SSE3) == 0)
			*ecx &= ~CPUID_INTC_ECX_SSE3;

		if (cpi->cpi_vendor == X86_VENDOR_Intel) {
			if ((x86_feature & X86_SSSE3) == 0)
				*ecx &= ~CPUID_INTC_ECX_SSSE3;
			if ((x86_feature & X86_SSE4_1) == 0)
				*ecx &= ~CPUID_INTC_ECX_SSE4_1;
			if ((x86_feature & X86_SSE4_2) == 0)
				*ecx &= ~CPUID_INTC_ECX_SSE4_2;
		}

		/*
		 * [no explicit support required beyond x87 fp context]
		 */
		if (!fpu_exists)
			*edx &= ~(CPUID_INTC_EDX_FPU | CPUID_INTC_EDX_MMX);

		/*
		 * Now map the supported feature vector to things that we
		 * think userland will care about.
		 */
		if (*edx & CPUID_INTC_EDX_SEP)
			hwcap_flags |= AV_386_SEP;
		if (*edx & CPUID_INTC_EDX_SSE)
			hwcap_flags |= AV_386_FXSR | AV_386_SSE;
		if (*edx & CPUID_INTC_EDX_SSE2)
			hwcap_flags |= AV_386_SSE2;
		if (*ecx & CPUID_INTC_ECX_SSE3)
			hwcap_flags |= AV_386_SSE3;
		if (cpi->cpi_vendor == X86_VENDOR_Intel) {
			if (*ecx & CPUID_INTC_ECX_SSSE3)
				hwcap_flags |= AV_386_SSSE3;
			if (*ecx & CPUID_INTC_ECX_SSE4_1)
				hwcap_flags |= AV_386_SSE4_1;
			if (*ecx & CPUID_INTC_ECX_SSE4_2)
				hwcap_flags |= AV_386_SSE4_2;
		}
		if (*ecx & CPUID_INTC_ECX_POPCNT)
			hwcap_flags |= AV_386_POPCNT;
		if (*edx & CPUID_INTC_EDX_FPU)
			hwcap_flags |= AV_386_FPU;
		if (*edx & CPUID_INTC_EDX_MMX)
			hwcap_flags |= AV_386_MMX;

		if (*edx & CPUID_INTC_EDX_TSC)
			hwcap_flags |= AV_386_TSC;
		if (*edx & CPUID_INTC_EDX_CX8)
			hwcap_flags |= AV_386_CX8;
		if (*edx & CPUID_INTC_EDX_CMOV)
			hwcap_flags |= AV_386_CMOV;
		if (*ecx & CPUID_INTC_ECX_MON)
			hwcap_flags |= AV_386_MON;
		if (*ecx & CPUID_INTC_ECX_CX16)
			hwcap_flags |= AV_386_CX16;
	}

	if (x86_feature & X86_HTT)
		hwcap_flags |= AV_386_PAUSE;

	if (cpi->cpi_xmaxeax < 0x80000001)
		goto pass4_done;

	switch (cpi->cpi_vendor) {
		struct cpuid_regs cp;
		uint32_t *edx, *ecx;

	case X86_VENDOR_Intel:
		/*
		 * Seems like Intel duplicated what we necessary
		 * here to make the initial crop of 64-bit OS's work.
		 * Hopefully, those are the only "extended" bits
		 * they'll add.
		 */
		/*FALLTHROUGH*/

	case X86_VENDOR_AMD:
		edx = &cpi->cpi_support[AMD_EDX_FEATURES];
		ecx = &cpi->cpi_support[AMD_ECX_FEATURES];

		*edx = CPI_FEATURES_XTD_EDX(cpi);
		*ecx = CPI_FEATURES_XTD_ECX(cpi);

		/*
		 * [these features require explicit kernel support]
		 */
		switch (cpi->cpi_vendor) {
		case X86_VENDOR_Intel:
			if ((x86_feature & X86_TSCP) == 0)
				*edx &= ~CPUID_AMD_EDX_TSCP;
			break;

		case X86_VENDOR_AMD:
			if ((x86_feature & X86_TSCP) == 0)
				*edx &= ~CPUID_AMD_EDX_TSCP;
			if ((x86_feature & X86_SSE4A) == 0)
				*ecx &= ~CPUID_AMD_ECX_SSE4A;
			break;

		default:
			break;
		}

		/*
		 * [no explicit support required beyond
		 * x87 fp context and exception handlers]
		 */
		if (!fpu_exists)
			*edx &= ~(CPUID_AMD_EDX_MMXamd |
			    CPUID_AMD_EDX_3DNow | CPUID_AMD_EDX_3DNowx);

		if ((x86_feature & X86_NX) == 0)
			*edx &= ~CPUID_AMD_EDX_NX;
#if !defined(__amd64)
		*edx &= ~CPUID_AMD_EDX_LM;
#endif
		/*
		 * Now map the supported feature vector to
		 * things that we think userland will care about.
		 */
#if defined(__amd64)
		if (*edx & CPUID_AMD_EDX_SYSC)
			hwcap_flags |= AV_386_AMD_SYSC;
#endif
		if (*edx & CPUID_AMD_EDX_MMXamd)
			hwcap_flags |= AV_386_AMD_MMX;
		if (*edx & CPUID_AMD_EDX_3DNow)
			hwcap_flags |= AV_386_AMD_3DNow;
		if (*edx & CPUID_AMD_EDX_3DNowx)
			hwcap_flags |= AV_386_AMD_3DNowx;

		switch (cpi->cpi_vendor) {
		case X86_VENDOR_AMD:
			if (*edx & CPUID_AMD_EDX_TSCP)
				hwcap_flags |= AV_386_TSCP;
			if (*ecx & CPUID_AMD_ECX_AHF64)
				hwcap_flags |= AV_386_AHF;
			if (*ecx & CPUID_AMD_ECX_SSE4A)
				hwcap_flags |= AV_386_AMD_SSE4A;
			if (*ecx & CPUID_AMD_ECX_LZCNT)
				hwcap_flags |= AV_386_AMD_LZCNT;
			break;

		case X86_VENDOR_Intel:
			if (*edx & CPUID_AMD_EDX_TSCP)
				hwcap_flags |= AV_386_TSCP;
			/*
			 * Aarrgh.
			 * Intel uses a different bit in the same word.
			 */
			if (*ecx & CPUID_INTC_ECX_AHF64)
				hwcap_flags |= AV_386_AHF;
			break;

		default:
			break;
		}
		break;

	case X86_VENDOR_TM:
		cp.cp_eax = 0x80860001;
		(void) __cpuid_insn(&cp);
		cpi->cpi_support[TM_EDX_FEATURES] = cp.cp_edx;
		break;

	default:
		break;
	}

pass4_done:
	cpi->cpi_pass = 4;
	return (hwcap_flags);
}


/*
 * Simulate the cpuid instruction using the data we previously
 * captured about this CPU.  We try our best to return the truth
 * about the hardware, independently of kernel support.
 */
uint32_t
cpuid_insn(cpu_t *cpu, struct cpuid_regs *cp)
{
	struct cpuid_info *cpi;
	struct cpuid_regs *xcp;

	if (cpu == NULL)
		cpu = CPU;
	cpi = cpu->cpu_m.mcpu_cpi;

	ASSERT(cpuid_checkpass(cpu, 3));

	/*
	 * CPUID data is cached in two separate places: cpi_std for standard
	 * CPUID functions, and cpi_extd for extended CPUID functions.
	 */
	if (cp->cp_eax <= cpi->cpi_maxeax && cp->cp_eax < NMAX_CPI_STD)
		xcp = &cpi->cpi_std[cp->cp_eax];
	else if (cp->cp_eax >= 0x80000000 && cp->cp_eax <= cpi->cpi_xmaxeax &&
	    cp->cp_eax < 0x80000000 + NMAX_CPI_EXTD)
		xcp = &cpi->cpi_extd[cp->cp_eax - 0x80000000];
	else
		/*
		 * The caller is asking for data from an input parameter which
		 * the kernel has not cached.  In this case we go fetch from
		 * the hardware and return the data directly to the user.
		 */
		return (__cpuid_insn(cp));

	cp->cp_eax = xcp->cp_eax;
	cp->cp_ebx = xcp->cp_ebx;
	cp->cp_ecx = xcp->cp_ecx;
	cp->cp_edx = xcp->cp_edx;
	return (cp->cp_eax);
}

int
cpuid_checkpass(cpu_t *cpu, int pass)
{
	return (cpu != NULL && cpu->cpu_m.mcpu_cpi != NULL &&
	    cpu->cpu_m.mcpu_cpi->cpi_pass >= pass);
}

int
cpuid_getbrandstr(cpu_t *cpu, char *s, size_t n)
{
	ASSERT(cpuid_checkpass(cpu, 3));

	return (snprintf(s, n, "%s", cpu->cpu_m.mcpu_cpi->cpi_brandstr));
}

int
cpuid_is_cmt(cpu_t *cpu)
{
	if (cpu == NULL)
		cpu = CPU;

	ASSERT(cpuid_checkpass(cpu, 1));

	return (cpu->cpu_m.mcpu_cpi->cpi_chipid >= 0);
}

/*
 * AMD and Intel both implement the 64-bit variant of the syscall
 * instruction (syscallq), so if there's -any- support for syscall,
 * cpuid currently says "yes, we support this".
 *
 * However, Intel decided to -not- implement the 32-bit variant of the
 * syscall instruction, so we provide a predicate to allow our caller
 * to test that subtlety here.
 *
 * XXPV	Currently, 32-bit syscall instructions don't work via the hypervisor,
 *	even in the case where the hardware would in fact support it.
 */
/*ARGSUSED*/
int
cpuid_syscall32_insn(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass((cpu == NULL ? CPU : cpu), 1));

#if !defined(__xpv)
	if (cpu == NULL)
		cpu = CPU;

	/*CSTYLED*/
	{
		struct cpuid_info *cpi = cpu->cpu_m.mcpu_cpi;

		if (cpi->cpi_vendor == X86_VENDOR_AMD &&
		    cpi->cpi_xmaxeax >= 0x80000001 &&
		    (CPI_FEATURES_XTD_EDX(cpi) & CPUID_AMD_EDX_SYSC))
			return (1);
	}
#endif
	return (0);
}

int
cpuid_getidstr(cpu_t *cpu, char *s, size_t n)
{
	struct cpuid_info *cpi = cpu->cpu_m.mcpu_cpi;

	static const char fmt[] =
	    "x86 (%s %X family %d model %d step %d clock %d MHz)";
	static const char fmt_ht[] =
	    "x86 (chipid 0x%x %s %X family %d model %d step %d clock %d MHz)";

	ASSERT(cpuid_checkpass(cpu, 1));

	if (cpuid_is_cmt(cpu))
		return (snprintf(s, n, fmt_ht, cpi->cpi_chipid,
		    cpi->cpi_vendorstr, cpi->cpi_std[1].cp_eax,
		    cpi->cpi_family, cpi->cpi_model,
		    cpi->cpi_step, cpu->cpu_type_info.pi_clock));
	return (snprintf(s, n, fmt,
	    cpi->cpi_vendorstr, cpi->cpi_std[1].cp_eax,
	    cpi->cpi_family, cpi->cpi_model,
	    cpi->cpi_step, cpu->cpu_type_info.pi_clock));
}

const char *
cpuid_getvendorstr(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return ((const char *)cpu->cpu_m.mcpu_cpi->cpi_vendorstr);
}

uint_t
cpuid_getvendor(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_vendor);
}

uint_t
cpuid_getfamily(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_family);
}

uint_t
cpuid_getmodel(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_model);
}

uint_t
cpuid_get_ncpu_per_chip(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_ncpu_per_chip);
}

uint_t
cpuid_get_ncore_per_chip(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_ncore_per_chip);
}

uint_t
cpuid_get_ncpu_sharing_last_cache(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 2));
	return (cpu->cpu_m.mcpu_cpi->cpi_ncpu_shr_last_cache);
}

id_t
cpuid_get_last_lvl_cacheid(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 2));
	return (cpu->cpu_m.mcpu_cpi->cpi_last_lvl_cacheid);
}

uint_t
cpuid_getstep(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_step);
}

uint_t
cpuid_getsig(struct cpu *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_std[1].cp_eax);
}

uint32_t
cpuid_getchiprev(struct cpu *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_chiprev);
}

const char *
cpuid_getchiprevstr(struct cpu *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_chiprevstr);
}

uint32_t
cpuid_getsockettype(struct cpu *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_socket);
}

int
cpuid_get_chipid(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));

	if (cpuid_is_cmt(cpu))
		return (cpu->cpu_m.mcpu_cpi->cpi_chipid);
	return (cpu->cpu_id);
}

id_t
cpuid_get_coreid(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_coreid);
}

int
cpuid_get_pkgcoreid(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_pkgcoreid);
}

int
cpuid_get_clogid(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 1));
	return (cpu->cpu_m.mcpu_cpi->cpi_clogid);
}

void
cpuid_get_addrsize(cpu_t *cpu, uint_t *pabits, uint_t *vabits)
{
	struct cpuid_info *cpi;

	if (cpu == NULL)
		cpu = CPU;
	cpi = cpu->cpu_m.mcpu_cpi;

	ASSERT(cpuid_checkpass(cpu, 1));

	if (pabits)
		*pabits = cpi->cpi_pabits;
	if (vabits)
		*vabits = cpi->cpi_vabits;
}

/*
 * Returns the number of data TLB entries for a corresponding
 * pagesize.  If it can't be computed, or isn't known, the
 * routine returns zero.  If you ask about an architecturally
 * impossible pagesize, the routine will panic (so that the
 * hat implementor knows that things are inconsistent.)
 */
uint_t
cpuid_get_dtlb_nent(cpu_t *cpu, size_t pagesize)
{
	struct cpuid_info *cpi;
	uint_t dtlb_nent = 0;

	if (cpu == NULL)
		cpu = CPU;
	cpi = cpu->cpu_m.mcpu_cpi;

	ASSERT(cpuid_checkpass(cpu, 1));

	/*
	 * Check the L2 TLB info
	 */
	if (cpi->cpi_xmaxeax >= 0x80000006) {
		struct cpuid_regs *cp = &cpi->cpi_extd[6];

		switch (pagesize) {

		case 4 * 1024:
			/*
			 * All zero in the top 16 bits of the register
			 * indicates a unified TLB. Size is in low 16 bits.
			 */
			if ((cp->cp_ebx & 0xffff0000) == 0)
				dtlb_nent = cp->cp_ebx & 0x0000ffff;
			else
				dtlb_nent = BITX(cp->cp_ebx, 27, 16);
			break;

		case 2 * 1024 * 1024:
			if ((cp->cp_eax & 0xffff0000) == 0)
				dtlb_nent = cp->cp_eax & 0x0000ffff;
			else
				dtlb_nent = BITX(cp->cp_eax, 27, 16);
			break;

		default:
			panic("unknown L2 pagesize");
			/*NOTREACHED*/
		}
	}

	if (dtlb_nent != 0)
		return (dtlb_nent);

	/*
	 * No L2 TLB support for this size, try L1.
	 */
	if (cpi->cpi_xmaxeax >= 0x80000005) {
		struct cpuid_regs *cp = &cpi->cpi_extd[5];

		switch (pagesize) {
		case 4 * 1024:
			dtlb_nent = BITX(cp->cp_ebx, 23, 16);
			break;
		case 2 * 1024 * 1024:
			dtlb_nent = BITX(cp->cp_eax, 23, 16);
			break;
		default:
			panic("unknown L1 d-TLB pagesize");
			/*NOTREACHED*/
		}
	}

	return (dtlb_nent);
}

/*
 * Return 0 if the erratum is not present or not applicable, positive
 * if it is, and negative if the status of the erratum is unknown.
 *
 * See "Revision Guide for AMD Athlon(tm) 64 and AMD Opteron(tm)
 * Processors" #25759, Rev 3.57, August 2005
 */
int
cpuid_opteron_erratum(cpu_t *cpu, uint_t erratum)
{
	struct cpuid_info *cpi = cpu->cpu_m.mcpu_cpi;
	uint_t eax;

	/*
	 * Bail out if this CPU isn't an AMD CPU, or if it's
	 * a legacy (32-bit) AMD CPU.
	 */
	if (cpi->cpi_vendor != X86_VENDOR_AMD ||
	    cpi->cpi_family == 4 || cpi->cpi_family == 5 ||
	    cpi->cpi_family == 6)

		return (0);

	eax = cpi->cpi_std[1].cp_eax;

#define	SH_B0(eax)	(eax == 0xf40 || eax == 0xf50)
#define	SH_B3(eax) 	(eax == 0xf51)
#define	B(eax)		(SH_B0(eax) || SH_B3(eax))

#define	SH_C0(eax)	(eax == 0xf48 || eax == 0xf58)

#define	SH_CG(eax)	(eax == 0xf4a || eax == 0xf5a || eax == 0xf7a)
#define	DH_CG(eax)	(eax == 0xfc0 || eax == 0xfe0 || eax == 0xff0)
#define	CH_CG(eax)	(eax == 0xf82 || eax == 0xfb2)
#define	CG(eax)		(SH_CG(eax) || DH_CG(eax) || CH_CG(eax))

#define	SH_D0(eax)	(eax == 0x10f40 || eax == 0x10f50 || eax == 0x10f70)
#define	DH_D0(eax)	(eax == 0x10fc0 || eax == 0x10ff0)
#define	CH_D0(eax)	(eax == 0x10f80 || eax == 0x10fb0)
#define	D0(eax)		(SH_D0(eax) || DH_D0(eax) || CH_D0(eax))

#define	SH_E0(eax)	(eax == 0x20f50 || eax == 0x20f40 || eax == 0x20f70)
#define	JH_E1(eax)	(eax == 0x20f10)	/* JH8_E0 had 0x20f30 */
#define	DH_E3(eax)	(eax == 0x20fc0 || eax == 0x20ff0)
#define	SH_E4(eax)	(eax == 0x20f51 || eax == 0x20f71)
#define	BH_E4(eax)	(eax == 0x20fb1)
#define	SH_E5(eax)	(eax == 0x20f42)
#define	DH_E6(eax)	(eax == 0x20ff2 || eax == 0x20fc2)
#define	JH_E6(eax)	(eax == 0x20f12 || eax == 0x20f32)
#define	EX(eax)		(SH_E0(eax) || JH_E1(eax) || DH_E3(eax) || \
			    SH_E4(eax) || BH_E4(eax) || SH_E5(eax) || \
			    DH_E6(eax) || JH_E6(eax))

#define	DR_AX(eax)	(eax == 0x100f00 || eax == 0x100f01 || eax == 0x100f02)
#define	DR_B0(eax)	(eax == 0x100f20)
#define	DR_B1(eax)	(eax == 0x100f21)
#define	DR_BA(eax)	(eax == 0x100f2a)
#define	DR_B2(eax)	(eax == 0x100f22)
#define	DR_B3(eax)	(eax == 0x100f23)
#define	RB_C0(eax)	(eax == 0x100f40)

	switch (erratum) {
	case 1:
		return (cpi->cpi_family < 0x10);
	case 51:	/* what does the asterisk mean? */
		return (B(eax) || SH_C0(eax) || CG(eax));
	case 52:
		return (B(eax));
	case 57:
		return (cpi->cpi_family <= 0x11);
	case 58:
		return (B(eax));
	case 60:
		return (cpi->cpi_family <= 0x11);
	case 61:
	case 62:
	case 63:
	case 64:
	case 65:
	case 66:
	case 68:
	case 69:
	case 70:
	case 71:
		return (B(eax));
	case 72:
		return (SH_B0(eax));
	case 74:
		return (B(eax));
	case 75:
		return (cpi->cpi_family < 0x10);
	case 76:
		return (B(eax));
	case 77:
		return (cpi->cpi_family <= 0x11);
	case 78:
		return (B(eax) || SH_C0(eax));
	case 79:
		return (B(eax) || SH_C0(eax) || CG(eax) || D0(eax) || EX(eax));
	case 80:
	case 81:
	case 82:
		return (B(eax));
	case 83:
		return (B(eax) || SH_C0(eax) || CG(eax));
	case 85:
		return (cpi->cpi_family < 0x10);
	case 86:
		return (SH_C0(eax) || CG(eax));
	case 88:
#if !defined(__amd64)
		return (0);
#else
		return (B(eax) || SH_C0(eax));
#endif
	case 89:
		return (cpi->cpi_family < 0x10);
	case 90:
		return (B(eax) || SH_C0(eax) || CG(eax));
	case 91:
	case 92:
		return (B(eax) || SH_C0(eax));
	case 93:
		return (SH_C0(eax));
	case 94:
		return (B(eax) || SH_C0(eax) || CG(eax));
	case 95:
#if !defined(__amd64)
		return (0);
#else
		return (B(eax) || SH_C0(eax));
#endif
	case 96:
		return (B(eax) || SH_C0(eax) || CG(eax));
	case 97:
	case 98:
		return (SH_C0(eax) || CG(eax));
	case 99:
		return (B(eax) || SH_C0(eax) || CG(eax) || D0(eax));
	case 100:
		return (B(eax) || SH_C0(eax));
	case 101:
	case 103:
		return (B(eax) || SH_C0(eax) || CG(eax) || D0(eax));
	case 104:
		return (SH_C0(eax) || CG(eax) || D0(eax));
	case 105:
	case 106:
	case 107:
		return (B(eax) || SH_C0(eax) || CG(eax) || D0(eax));
	case 108:
		return (DH_CG(eax));
	case 109:
		return (SH_C0(eax) || CG(eax) || D0(eax));
	case 110:
		return (D0(eax) || EX(eax));
	case 111:
		return (CG(eax));
	case 112:
		return (B(eax) || SH_C0(eax) || CG(eax) || D0(eax) || EX(eax));
	case 113:
		return (eax == 0x20fc0);
	case 114:
		return (SH_E0(eax) || JH_E1(eax) || DH_E3(eax));
	case 115:
		return (SH_E0(eax) || JH_E1(eax));
	case 116:
		return (SH_E0(eax) || JH_E1(eax) || DH_E3(eax));
	case 117:
		return (B(eax) || SH_C0(eax) || CG(eax) || D0(eax));
	case 118:
		return (SH_E0(eax) || JH_E1(eax) || SH_E4(eax) || BH_E4(eax) ||
		    JH_E6(eax));
	case 121:
		return (B(eax) || SH_C0(eax) || CG(eax) || D0(eax) || EX(eax));
	case 122:
		return (cpi->cpi_family < 0x10 || cpi->cpi_family == 0x11);
	case 123:
		return (JH_E1(eax) || BH_E4(eax) || JH_E6(eax));
	case 131:
		return (cpi->cpi_family < 0x10);
	case 6336786:
		/*
		 * Test for AdvPowerMgmtInfo.TscPStateInvariant
		 * if this is a K8 family or newer processor
		 */
		if (CPI_FAMILY(cpi) == 0xf) {
			struct cpuid_regs regs;
			regs.cp_eax = 0x80000007;
			(void) __cpuid_insn(&regs);
			return (!(regs.cp_edx & 0x100));
		}
		return (0);
	case 6323525:
		return (((((eax >> 12) & 0xff00) + (eax & 0xf00)) |
		    (((eax >> 4) & 0xf) | ((eax >> 12) & 0xf0))) < 0xf40);

	case 6671130:
		/*
		 * check for processors (pre-Shanghai) that do not provide
		 * optimal management of 1gb ptes in its tlb.
		 */
		return (cpi->cpi_family == 0x10 && cpi->cpi_model < 4);

	case 298:
		return (DR_AX(eax) || DR_B0(eax) || DR_B1(eax) || DR_BA(eax) ||
		    DR_B2(eax) || RB_C0(eax));

	default:
		return (-1);

	}
}

/*
 * Determine if specified erratum is present via OSVW (OS Visible Workaround).
 * Return 1 if erratum is present, 0 if not present and -1 if indeterminate.
 */
int
osvw_opteron_erratum(cpu_t *cpu, uint_t erratum)
{
	struct cpuid_info	*cpi;
	uint_t			osvwid;
	static int		osvwfeature = -1;
	uint64_t		osvwlength;


	cpi = cpu->cpu_m.mcpu_cpi;

	/* confirm OSVW supported */
	if (osvwfeature == -1) {
		osvwfeature = cpi->cpi_extd[1].cp_ecx & CPUID_AMD_ECX_OSVW;
	} else {
		/* assert that osvw feature setting is consistent on all cpus */
		ASSERT(osvwfeature ==
		    (cpi->cpi_extd[1].cp_ecx & CPUID_AMD_ECX_OSVW));
	}
	if (!osvwfeature)
		return (-1);

	osvwlength = rdmsr(MSR_AMD_OSVW_ID_LEN) & OSVW_ID_LEN_MASK;

	switch (erratum) {
	case 298:	/* osvwid is 0 */
		osvwid = 0;
		if (osvwlength <= (uint64_t)osvwid) {
			/* osvwid 0 is unknown */
			return (-1);
		}

		/*
		 * Check the OSVW STATUS MSR to determine the state
		 * of the erratum where:
		 *   0 - fixed by HW
		 *   1 - BIOS has applied the workaround when BIOS
		 *   workaround is available. (Or for other errata,
		 *   OS workaround is required.)
		 * For a value of 1, caller will confirm that the
		 * erratum 298 workaround has indeed been applied by BIOS.
		 *
		 * A 1 may be set in cpus that have a HW fix
		 * in a mixed cpu system. Regarding erratum 298:
		 *   In a multiprocessor platform, the workaround above
		 *   should be applied to all processors regardless of
		 *   silicon revision when an affected processor is
		 *   present.
		 */

		return (rdmsr(MSR_AMD_OSVW_STATUS +
		    (osvwid / OSVW_ID_CNT_PER_MSR)) &
		    (1ULL << (osvwid % OSVW_ID_CNT_PER_MSR)));

	default:
		return (-1);
	}
}

static const char assoc_str[] = "associativity";
static const char line_str[] = "line-size";
static const char size_str[] = "size";

static void
add_cache_prop(dev_info_t *devi, const char *label, const char *type,
    uint32_t val)
{
	char buf[128];

	/*
	 * ndi_prop_update_int() is used because it is desirable for
	 * DDI_PROP_HW_DEF and DDI_PROP_DONTSLEEP to be set.
	 */
	if (snprintf(buf, sizeof (buf), "%s-%s", label, type) < sizeof (buf))
		(void) ndi_prop_update_int(DDI_DEV_T_NONE, devi, buf, val);
}

/*
 * Intel-style cache/tlb description
 *
 * Standard cpuid level 2 gives a randomly ordered
 * selection of tags that index into a table that describes
 * cache and tlb properties.
 */

static const char l1_icache_str[] = "l1-icache";
static const char l1_dcache_str[] = "l1-dcache";
static const char l2_cache_str[] = "l2-cache";
static const char l3_cache_str[] = "l3-cache";
static const char itlb4k_str[] = "itlb-4K";
static const char dtlb4k_str[] = "dtlb-4K";
static const char itlb2M_str[] = "itlb-2M";
static const char itlb4M_str[] = "itlb-4M";
static const char dtlb4M_str[] = "dtlb-4M";
static const char dtlb24_str[] = "dtlb0-2M-4M";
static const char itlb424_str[] = "itlb-4K-2M-4M";
static const char itlb24_str[] = "itlb-2M-4M";
static const char dtlb44_str[] = "dtlb-4K-4M";
static const char sl1_dcache_str[] = "sectored-l1-dcache";
static const char sl2_cache_str[] = "sectored-l2-cache";
static const char itrace_str[] = "itrace-cache";
static const char sl3_cache_str[] = "sectored-l3-cache";
static const char sh_l2_tlb4k_str[] = "shared-l2-tlb-4k";

static const struct cachetab {
	uint8_t 	ct_code;
	uint8_t		ct_assoc;
	uint16_t 	ct_line_size;
	size_t		ct_size;
	const char	*ct_label;
} intel_ctab[] = {
	/*
	 * maintain descending order!
	 *
	 * Codes ignored - Reason
	 * ----------------------
	 * 40H - intel_cpuid_4_cache_info() disambiguates l2/l3 cache
	 * f0H/f1H - Currently we do not interpret prefetch size by design
	 */
	{ 0xe4, 16, 64, 8*1024*1024, l3_cache_str},
	{ 0xe3, 16, 64, 4*1024*1024, l3_cache_str},
	{ 0xe2, 16, 64, 2*1024*1024, l3_cache_str},
	{ 0xde, 12, 64, 6*1024*1024, l3_cache_str},
	{ 0xdd, 12, 64, 3*1024*1024, l3_cache_str},
	{ 0xdc, 12, 64, ((1*1024*1024)+(512*1024)), l3_cache_str},
	{ 0xd8, 8, 64, 4*1024*1024, l3_cache_str},
	{ 0xd7, 8, 64, 2*1024*1024, l3_cache_str},
	{ 0xd6, 8, 64, 1*1024*1024, l3_cache_str},
	{ 0xd2, 4, 64, 2*1024*1024, l3_cache_str},
	{ 0xd1, 4, 64, 1*1024*1024, l3_cache_str},
	{ 0xd0, 4, 64, 512*1024, l3_cache_str},
	{ 0xca, 4, 0, 512, sh_l2_tlb4k_str},
	{ 0xc0, 4, 0, 8, dtlb44_str },
	{ 0xba, 4, 0, 64, dtlb4k_str },
	{ 0xb4, 4, 0, 256, dtlb4k_str },
	{ 0xb3, 4, 0, 128, dtlb4k_str },
	{ 0xb2, 4, 0, 64, itlb4k_str },
	{ 0xb0, 4, 0, 128, itlb4k_str },
	{ 0x87, 8, 64, 1024*1024, l2_cache_str},
	{ 0x86, 4, 64, 512*1024, l2_cache_str},
	{ 0x85, 8, 32, 2*1024*1024, l2_cache_str},
	{ 0x84, 8, 32, 1024*1024, l2_cache_str},
	{ 0x83, 8, 32, 512*1024, l2_cache_str},
	{ 0x82, 8, 32, 256*1024, l2_cache_str},
	{ 0x80, 8, 64, 512*1024, l2_cache_str},
	{ 0x7f, 2, 64, 512*1024, l2_cache_str},
	{ 0x7d, 8, 64, 2*1024*1024, sl2_cache_str},
	{ 0x7c, 8, 64, 1024*1024, sl2_cache_str},
	{ 0x7b, 8, 64, 512*1024, sl2_cache_str},
	{ 0x7a, 8, 64, 256*1024, sl2_cache_str},
	{ 0x79, 8, 64, 128*1024, sl2_cache_str},
	{ 0x78, 8, 64, 1024*1024, l2_cache_str},
	{ 0x73, 8, 0, 64*1024, itrace_str},
	{ 0x72, 8, 0, 32*1024, itrace_str},
	{ 0x71, 8, 0, 16*1024, itrace_str},
	{ 0x70, 8, 0, 12*1024, itrace_str},
	{ 0x68, 4, 64, 32*1024, sl1_dcache_str},
	{ 0x67, 4, 64, 16*1024, sl1_dcache_str},
	{ 0x66, 4, 64, 8*1024, sl1_dcache_str},
	{ 0x60, 8, 64, 16*1024, sl1_dcache_str},
	{ 0x5d, 0, 0, 256, dtlb44_str},
	{ 0x5c, 0, 0, 128, dtlb44_str},
	{ 0x5b, 0, 0, 64, dtlb44_str},
	{ 0x5a, 4, 0, 32, dtlb24_str},
	{ 0x59, 0, 0, 16, dtlb4k_str},
	{ 0x57, 4, 0, 16, dtlb4k_str},
	{ 0x56, 4, 0, 16, dtlb4M_str},
	{ 0x55, 0, 0, 7, itlb24_str},
	{ 0x52, 0, 0, 256, itlb424_str},
	{ 0x51, 0, 0, 128, itlb424_str},
	{ 0x50, 0, 0, 64, itlb424_str},
	{ 0x4f, 0, 0, 32, itlb4k_str},
	{ 0x4e, 24, 64, 6*1024*1024, l2_cache_str},
	{ 0x4d, 16, 64, 16*1024*1024, l3_cache_str},
	{ 0x4c, 12, 64, 12*1024*1024, l3_cache_str},
	{ 0x4b, 16, 64, 8*1024*1024, l3_cache_str},
	{ 0x4a, 12, 64, 6*1024*1024, l3_cache_str},
	{ 0x49, 16, 64, 4*1024*1024, l3_cache_str},
	{ 0x48, 12, 64, 3*1024*1024, l2_cache_str},
	{ 0x47, 8, 64, 8*1024*1024, l3_cache_str},
	{ 0x46, 4, 64, 4*1024*1024, l3_cache_str},
	{ 0x45, 4, 32, 2*1024*1024, l2_cache_str},
	{ 0x44, 4, 32, 1024*1024, l2_cache_str},
	{ 0x43, 4, 32, 512*1024, l2_cache_str},
	{ 0x42, 4, 32, 256*1024, l2_cache_str},
	{ 0x41, 4, 32, 128*1024, l2_cache_str},
	{ 0x3e, 4, 64, 512*1024, sl2_cache_str},
	{ 0x3d, 6, 64, 384*1024, sl2_cache_str},
	{ 0x3c, 4, 64, 256*1024, sl2_cache_str},
	{ 0x3b, 2, 64, 128*1024, sl2_cache_str},
	{ 0x3a, 6, 64, 192*1024, sl2_cache_str},
	{ 0x39, 4, 64, 128*1024, sl2_cache_str},
	{ 0x30, 8, 64, 32*1024, l1_icache_str},
	{ 0x2c, 8, 64, 32*1024, l1_dcache_str},
	{ 0x29, 8, 64, 4096*1024, sl3_cache_str},
	{ 0x25, 8, 64, 2048*1024, sl3_cache_str},
	{ 0x23, 8, 64, 1024*1024, sl3_cache_str},
	{ 0x22, 4, 64, 512*1024, sl3_cache_str},
	{ 0x0e, 6, 64, 24*1024, l1_dcache_str},
	{ 0x0d, 4, 32, 16*1024, l1_dcache_str},
	{ 0x0c, 4, 32, 16*1024, l1_dcache_str},
	{ 0x0b, 4, 0, 4, itlb4M_str},
	{ 0x0a, 2, 32, 8*1024, l1_dcache_str},
	{ 0x08, 4, 32, 16*1024, l1_icache_str},
	{ 0x06, 4, 32, 8*1024, l1_icache_str},
	{ 0x05, 4, 0, 32, dtlb4M_str},
	{ 0x04, 4, 0, 8, dtlb4M_str},
	{ 0x03, 4, 0, 64, dtlb4k_str},
	{ 0x02, 4, 0, 2, itlb4M_str},
	{ 0x01, 4, 0, 32, itlb4k_str},
	{ 0 }
};

static const struct cachetab cyrix_ctab[] = {
	{ 0x70, 4, 0, 32, "tlb-4K" },
	{ 0x80, 4, 16, 16*1024, "l1-cache" },
	{ 0 }
};

/*
 * Search a cache table for a matching entry
 */
static const struct cachetab *
find_cacheent(const struct cachetab *ct, uint_t code)
{
	if (code != 0) {
		for (; ct->ct_code != 0; ct++)
			if (ct->ct_code <= code)
				break;
		if (ct->ct_code == code)
			return (ct);
	}
	return (NULL);
}

/*
 * Populate cachetab entry with L2 or L3 cache-information using
 * cpuid function 4. This function is called from intel_walk_cacheinfo()
 * when descriptor 0x49 is encountered. It returns 0 if no such cache
 * information is found.
 */
static int
intel_cpuid_4_cache_info(struct cachetab *ct, struct cpuid_info *cpi)
{
	uint32_t level, i;
	int ret = 0;

	for (i = 0; i < cpi->cpi_std_4_size; i++) {
		level = CPI_CACHE_LVL(cpi->cpi_std_4[i]);

		if (level == 2 || level == 3) {
			ct->ct_assoc = CPI_CACHE_WAYS(cpi->cpi_std_4[i]) + 1;
			ct->ct_line_size =
			    CPI_CACHE_COH_LN_SZ(cpi->cpi_std_4[i]) + 1;
			ct->ct_size = ct->ct_assoc *
			    (CPI_CACHE_PARTS(cpi->cpi_std_4[i]) + 1) *
			    ct->ct_line_size *
			    (cpi->cpi_std_4[i]->cp_ecx + 1);

			if (level == 2) {
				ct->ct_label = l2_cache_str;
			} else if (level == 3) {
				ct->ct_label = l3_cache_str;
			}
			ret = 1;
		}
	}

	return (ret);
}

/*
 * Walk the cacheinfo descriptor, applying 'func' to every valid element
 * The walk is terminated if the walker returns non-zero.
 */
static void
intel_walk_cacheinfo(struct cpuid_info *cpi,
    void *arg, int (*func)(void *, const struct cachetab *))
{
	const struct cachetab *ct;
	struct cachetab des_49_ct, des_b1_ct;
	uint8_t *dp;
	int i;

	if ((dp = cpi->cpi_cacheinfo) == NULL)
		return;
	for (i = 0; i < cpi->cpi_ncache; i++, dp++) {
		/*
		 * For overloaded descriptor 0x49 we use cpuid function 4
		 * if supported by the current processor, to create
		 * cache information.
		 * For overloaded descriptor 0xb1 we use X86_PAE flag
		 * to disambiguate the cache information.
		 */
		if (*dp == 0x49 && cpi->cpi_maxeax >= 0x4 &&
		    intel_cpuid_4_cache_info(&des_49_ct, cpi) == 1) {
				ct = &des_49_ct;
		} else if (*dp == 0xb1) {
			des_b1_ct.ct_code = 0xb1;
			des_b1_ct.ct_assoc = 4;
			des_b1_ct.ct_line_size = 0;
			if (x86_feature & X86_PAE) {
				des_b1_ct.ct_size = 8;
				des_b1_ct.ct_label = itlb2M_str;
			} else {
				des_b1_ct.ct_size = 4;
				des_b1_ct.ct_label = itlb4M_str;
			}
			ct = &des_b1_ct;
		} else {
			if ((ct = find_cacheent(intel_ctab, *dp)) == NULL) {
				continue;
			}
		}

		if (func(arg, ct) != 0) {
			break;
		}
	}
}

/*
 * (Like the Intel one, except for Cyrix CPUs)
 */
static void
cyrix_walk_cacheinfo(struct cpuid_info *cpi,
    void *arg, int (*func)(void *, const struct cachetab *))
{
	const struct cachetab *ct;
	uint8_t *dp;
	int i;

	if ((dp = cpi->cpi_cacheinfo) == NULL)
		return;
	for (i = 0; i < cpi->cpi_ncache; i++, dp++) {
		/*
		 * Search Cyrix-specific descriptor table first ..
		 */
		if ((ct = find_cacheent(cyrix_ctab, *dp)) != NULL) {
			if (func(arg, ct) != 0)
				break;
			continue;
		}
		/*
		 * .. else fall back to the Intel one
		 */
		if ((ct = find_cacheent(intel_ctab, *dp)) != NULL) {
			if (func(arg, ct) != 0)
				break;
			continue;
		}
	}
}

/*
 * A cacheinfo walker that adds associativity, line-size, and size properties
 * to the devinfo node it is passed as an argument.
 */
static int
add_cacheent_props(void *arg, const struct cachetab *ct)
{
	dev_info_t *devi = arg;

	add_cache_prop(devi, ct->ct_label, assoc_str, ct->ct_assoc);
	if (ct->ct_line_size != 0)
		add_cache_prop(devi, ct->ct_label, line_str,
		    ct->ct_line_size);
	add_cache_prop(devi, ct->ct_label, size_str, ct->ct_size);
	return (0);
}


static const char fully_assoc[] = "fully-associative?";

/*
 * AMD style cache/tlb description
 *
 * Extended functions 5 and 6 directly describe properties of
 * tlbs and various cache levels.
 */
static void
add_amd_assoc(dev_info_t *devi, const char *label, uint_t assoc)
{
	switch (assoc) {
	case 0:	/* reserved; ignore */
		break;
	default:
		add_cache_prop(devi, label, assoc_str, assoc);
		break;
	case 0xff:
		add_cache_prop(devi, label, fully_assoc, 1);
		break;
	}
}

static void
add_amd_tlb(dev_info_t *devi, const char *label, uint_t assoc, uint_t size)
{
	if (size == 0)
		return;
	add_cache_prop(devi, label, size_str, size);
	add_amd_assoc(devi, label, assoc);
}

static void
add_amd_cache(dev_info_t *devi, const char *label,
    uint_t size, uint_t assoc, uint_t lines_per_tag, uint_t line_size)
{
	if (size == 0 || line_size == 0)
		return;
	add_amd_assoc(devi, label, assoc);
	/*
	 * Most AMD parts have a sectored cache. Multiple cache lines are
	 * associated with each tag. A sector consists of all cache lines
	 * associated with a tag. For example, the AMD K6-III has a sector
	 * size of 2 cache lines per tag.
	 */
	if (lines_per_tag != 0)
		add_cache_prop(devi, label, "lines-per-tag", lines_per_tag);
	add_cache_prop(devi, label, line_str, line_size);
	add_cache_prop(devi, label, size_str, size * 1024);
}

static void
add_amd_l2_assoc(dev_info_t *devi, const char *label, uint_t assoc)
{
	switch (assoc) {
	case 0:	/* off */
		break;
	case 1:
	case 2:
	case 4:
		add_cache_prop(devi, label, assoc_str, assoc);
		break;
	case 6:
		add_cache_prop(devi, label, assoc_str, 8);
		break;
	case 8:
		add_cache_prop(devi, label, assoc_str, 16);
		break;
	case 0xf:
		add_cache_prop(devi, label, fully_assoc, 1);
		break;
	default: /* reserved; ignore */
		break;
	}
}

static void
add_amd_l2_tlb(dev_info_t *devi, const char *label, uint_t assoc, uint_t size)
{
	if (size == 0 || assoc == 0)
		return;
	add_amd_l2_assoc(devi, label, assoc);
	add_cache_prop(devi, label, size_str, size);
}

static void
add_amd_l2_cache(dev_info_t *devi, const char *label,
    uint_t size, uint_t assoc, uint_t lines_per_tag, uint_t line_size)
{
	if (size == 0 || assoc == 0 || line_size == 0)
		return;
	add_amd_l2_assoc(devi, label, assoc);
	if (lines_per_tag != 0)
		add_cache_prop(devi, label, "lines-per-tag", lines_per_tag);
	add_cache_prop(devi, label, line_str, line_size);
	add_cache_prop(devi, label, size_str, size * 1024);
}

static void
amd_cache_info(struct cpuid_info *cpi, dev_info_t *devi)
{
	struct cpuid_regs *cp;

	if (cpi->cpi_xmaxeax < 0x80000005)
		return;
	cp = &cpi->cpi_extd[5];

	/*
	 * 4M/2M L1 TLB configuration
	 *
	 * We report the size for 2M pages because AMD uses two
	 * TLB entries for one 4M page.
	 */
	add_amd_tlb(devi, "dtlb-2M",
	    BITX(cp->cp_eax, 31, 24), BITX(cp->cp_eax, 23, 16));
	add_amd_tlb(devi, "itlb-2M",
	    BITX(cp->cp_eax, 15, 8), BITX(cp->cp_eax, 7, 0));

	/*
	 * 4K L1 TLB configuration
	 */

	switch (cpi->cpi_vendor) {
		uint_t nentries;
	case X86_VENDOR_TM:
		if (cpi->cpi_family >= 5) {
			/*
			 * Crusoe processors have 256 TLB entries, but
			 * cpuid data format constrains them to only
			 * reporting 255 of them.
			 */
			if ((nentries = BITX(cp->cp_ebx, 23, 16)) == 255)
				nentries = 256;
			/*
			 * Crusoe processors also have a unified TLB
			 */
			add_amd_tlb(devi, "tlb-4K", BITX(cp->cp_ebx, 31, 24),
			    nentries);
			break;
		}
		/*FALLTHROUGH*/
	default:
		add_amd_tlb(devi, itlb4k_str,
		    BITX(cp->cp_ebx, 31, 24), BITX(cp->cp_ebx, 23, 16));
		add_amd_tlb(devi, dtlb4k_str,
		    BITX(cp->cp_ebx, 15, 8), BITX(cp->cp_ebx, 7, 0));
		break;
	}

	/*
	 * data L1 cache configuration
	 */

	add_amd_cache(devi, l1_dcache_str,
	    BITX(cp->cp_ecx, 31, 24), BITX(cp->cp_ecx, 23, 16),
	    BITX(cp->cp_ecx, 15, 8), BITX(cp->cp_ecx, 7, 0));

	/*
	 * code L1 cache configuration
	 */

	add_amd_cache(devi, l1_icache_str,
	    BITX(cp->cp_edx, 31, 24), BITX(cp->cp_edx, 23, 16),
	    BITX(cp->cp_edx, 15, 8), BITX(cp->cp_edx, 7, 0));

	if (cpi->cpi_xmaxeax < 0x80000006)
		return;
	cp = &cpi->cpi_extd[6];

	/* Check for a unified L2 TLB for large pages */

	if (BITX(cp->cp_eax, 31, 16) == 0)
		add_amd_l2_tlb(devi, "l2-tlb-2M",
		    BITX(cp->cp_eax, 15, 12), BITX(cp->cp_eax, 11, 0));
	else {
		add_amd_l2_tlb(devi, "l2-dtlb-2M",
		    BITX(cp->cp_eax, 31, 28), BITX(cp->cp_eax, 27, 16));
		add_amd_l2_tlb(devi, "l2-itlb-2M",
		    BITX(cp->cp_eax, 15, 12), BITX(cp->cp_eax, 11, 0));
	}

	/* Check for a unified L2 TLB for 4K pages */

	if (BITX(cp->cp_ebx, 31, 16) == 0) {
		add_amd_l2_tlb(devi, "l2-tlb-4K",
		    BITX(cp->cp_eax, 15, 12), BITX(cp->cp_eax, 11, 0));
	} else {
		add_amd_l2_tlb(devi, "l2-dtlb-4K",
		    BITX(cp->cp_eax, 31, 28), BITX(cp->cp_eax, 27, 16));
		add_amd_l2_tlb(devi, "l2-itlb-4K",
		    BITX(cp->cp_eax, 15, 12), BITX(cp->cp_eax, 11, 0));
	}

	add_amd_l2_cache(devi, l2_cache_str,
	    BITX(cp->cp_ecx, 31, 16), BITX(cp->cp_ecx, 15, 12),
	    BITX(cp->cp_ecx, 11, 8), BITX(cp->cp_ecx, 7, 0));
}

/*
 * There are two basic ways that the x86 world describes it cache
 * and tlb architecture - Intel's way and AMD's way.
 *
 * Return which flavor of cache architecture we should use
 */
static int
x86_which_cacheinfo(struct cpuid_info *cpi)
{
	switch (cpi->cpi_vendor) {
	case X86_VENDOR_Intel:
		if (cpi->cpi_maxeax >= 2)
			return (X86_VENDOR_Intel);
		break;
	case X86_VENDOR_AMD:
		/*
		 * The K5 model 1 was the first part from AMD that reported
		 * cache sizes via extended cpuid functions.
		 */
		if (cpi->cpi_family > 5 ||
		    (cpi->cpi_family == 5 && cpi->cpi_model >= 1))
			return (X86_VENDOR_AMD);
		break;
	case X86_VENDOR_TM:
		if (cpi->cpi_family >= 5)
			return (X86_VENDOR_AMD);
		/*FALLTHROUGH*/
	default:
		/*
		 * If they have extended CPU data for 0x80000005
		 * then we assume they have AMD-format cache
		 * information.
		 *
		 * If not, and the vendor happens to be Cyrix,
		 * then try our-Cyrix specific handler.
		 *
		 * If we're not Cyrix, then assume we're using Intel's
		 * table-driven format instead.
		 */
		if (cpi->cpi_xmaxeax >= 0x80000005)
			return (X86_VENDOR_AMD);
		else if (cpi->cpi_vendor == X86_VENDOR_Cyrix)
			return (X86_VENDOR_Cyrix);
		else if (cpi->cpi_maxeax >= 2)
			return (X86_VENDOR_Intel);
		break;
	}
	return (-1);
}

/*
 * create a node for the given cpu under the prom root node.
 * Also, create a cpu node in the device tree.
 */
static dev_info_t *cpu_nex_devi = NULL;
static kmutex_t cpu_node_lock;

/*
 * Called from post_startup() and mp_startup()
 */
void
add_cpunode2devtree(processorid_t cpu_id, struct cpuid_info *cpi)
{
	dev_info_t *cpu_devi;
	int create;

	mutex_enter(&cpu_node_lock);

	/*
	 * create a nexus node for all cpus identified as 'cpu_id' under
	 * the root node.
	 */
	if (cpu_nex_devi == NULL) {
		if (ndi_devi_alloc(ddi_root_node(), "cpus",
		    (pnode_t)DEVI_SID_NODEID, &cpu_nex_devi) != NDI_SUCCESS) {
			mutex_exit(&cpu_node_lock);
			return;
		}
		(void) ndi_devi_online(cpu_nex_devi, 0);
	}

	/*
	 * create a child node for cpu identified as 'cpu_id'
	 */
	cpu_devi = ddi_add_child(cpu_nex_devi, "cpu", DEVI_SID_NODEID,
	    cpu_id);
	if (cpu_devi == NULL) {
		mutex_exit(&cpu_node_lock);
		return;
	}

	/* device_type */

	(void) ndi_prop_update_string(DDI_DEV_T_NONE, cpu_devi,
	    "device_type", "cpu");

	/* reg */

	(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
	    "reg", cpu_id);

	/* cpu-mhz, and clock-frequency */

	if (cpu_freq > 0) {
		long long mul;

		(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
		    "cpu-mhz", cpu_freq);

		if ((mul = cpu_freq * 1000000LL) <= INT_MAX)
			(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
			    "clock-frequency", (int)mul);
	}

	(void) ndi_devi_online(cpu_devi, 0);

	if ((x86_feature & X86_CPUID) == 0) {
		mutex_exit(&cpu_node_lock);
		return;
	}

	/* vendor-id */

	(void) ndi_prop_update_string(DDI_DEV_T_NONE, cpu_devi,
	    "vendor-id", cpi->cpi_vendorstr);

	if (cpi->cpi_maxeax == 0) {
		mutex_exit(&cpu_node_lock);
		return;
	}

	/*
	 * family, model, and step
	 */
	(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
	    "family", CPI_FAMILY(cpi));
	(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
	    "cpu-model", CPI_MODEL(cpi));
	(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
	    "stepping-id", CPI_STEP(cpi));

	/* type */

	switch (cpi->cpi_vendor) {
	case X86_VENDOR_Intel:
		create = 1;
		break;
	default:
		create = 0;
		break;
	}
	if (create)
		(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
		    "type", CPI_TYPE(cpi));

	/* ext-family */

	switch (cpi->cpi_vendor) {
	case X86_VENDOR_Intel:
	case X86_VENDOR_AMD:
		create = cpi->cpi_family >= 0xf;
		break;
	default:
		create = 0;
		break;
	}
	if (create)
		(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
		    "ext-family", CPI_FAMILY_XTD(cpi));

	/* ext-model */

	switch (cpi->cpi_vendor) {
	case X86_VENDOR_Intel:
		create = IS_EXTENDED_MODEL_INTEL(cpi);
		break;
	case X86_VENDOR_AMD:
		create = CPI_FAMILY(cpi) == 0xf;
		break;
	default:
		create = 0;
		break;
	}
	if (create)
		(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
		    "ext-model", CPI_MODEL_XTD(cpi));

	/* generation */

	switch (cpi->cpi_vendor) {
	case X86_VENDOR_AMD:
		/*
		 * AMD K5 model 1 was the first part to support this
		 */
		create = cpi->cpi_xmaxeax >= 0x80000001;
		break;
	default:
		create = 0;
		break;
	}
	if (create)
		(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
		    "generation", BITX((cpi)->cpi_extd[1].cp_eax, 11, 8));

	/* brand-id */

	switch (cpi->cpi_vendor) {
	case X86_VENDOR_Intel:
		/*
		 * brand id first appeared on Pentium III Xeon model 8,
		 * and Celeron model 8 processors and Opteron
		 */
		create = cpi->cpi_family > 6 ||
		    (cpi->cpi_family == 6 && cpi->cpi_model >= 8);
		break;
	case X86_VENDOR_AMD:
		create = cpi->cpi_family >= 0xf;
		break;
	default:
		create = 0;
		break;
	}
	if (create && cpi->cpi_brandid != 0) {
		(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
		    "brand-id", cpi->cpi_brandid);
	}

	/* chunks, and apic-id */

	switch (cpi->cpi_vendor) {
		/*
		 * first available on Pentium IV and Opteron (K8)
		 */
	case X86_VENDOR_Intel:
		create = IS_NEW_F6(cpi) || cpi->cpi_family >= 0xf;
		break;
	case X86_VENDOR_AMD:
		create = cpi->cpi_family >= 0xf;
		break;
	default:
		create = 0;
		break;
	}
	if (create) {
		(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
		    "chunks", CPI_CHUNKS(cpi));
		(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
		    "apic-id", CPI_APIC_ID(cpi));
		if (cpi->cpi_chipid >= 0) {
			(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
			    "chip#", cpi->cpi_chipid);
			(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
			    "clog#", cpi->cpi_clogid);
		}
	}

	/* cpuid-features */

	(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
	    "cpuid-features", CPI_FEATURES_EDX(cpi));


	/* cpuid-features-ecx */

	switch (cpi->cpi_vendor) {
	case X86_VENDOR_Intel:
		create = IS_NEW_F6(cpi) || cpi->cpi_family >= 0xf;
		break;
	default:
		create = 0;
		break;
	}
	if (create)
		(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
		    "cpuid-features-ecx", CPI_FEATURES_ECX(cpi));

	/* ext-cpuid-features */

	switch (cpi->cpi_vendor) {
	case X86_VENDOR_Intel:
	case X86_VENDOR_AMD:
	case X86_VENDOR_Cyrix:
	case X86_VENDOR_TM:
	case X86_VENDOR_Centaur:
		create = cpi->cpi_xmaxeax >= 0x80000001;
		break;
	default:
		create = 0;
		break;
	}
	if (create) {
		(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
		    "ext-cpuid-features", CPI_FEATURES_XTD_EDX(cpi));
		(void) ndi_prop_update_int(DDI_DEV_T_NONE, cpu_devi,
		    "ext-cpuid-features-ecx", CPI_FEATURES_XTD_ECX(cpi));
	}

	/*
	 * Brand String first appeared in Intel Pentium IV, AMD K5
	 * model 1, and Cyrix GXm.  On earlier models we try and
	 * simulate something similar .. so this string should always
	 * same -something- about the processor, however lame.
	 */
	(void) ndi_prop_update_string(DDI_DEV_T_NONE, cpu_devi,
	    "brand-string", cpi->cpi_brandstr);

	/*
	 * Finally, cache and tlb information
	 */
	switch (x86_which_cacheinfo(cpi)) {
	case X86_VENDOR_Intel:
		intel_walk_cacheinfo(cpi, cpu_devi, add_cacheent_props);
		break;
	case X86_VENDOR_Cyrix:
		cyrix_walk_cacheinfo(cpi, cpu_devi, add_cacheent_props);
		break;
	case X86_VENDOR_AMD:
		amd_cache_info(cpi, cpu_devi);
		break;
	default:
		break;
	}

	mutex_exit(&cpu_node_lock);
}

struct l2info {
	int *l2i_csz;
	int *l2i_lsz;
	int *l2i_assoc;
	int l2i_ret;
};

/*
 * A cacheinfo walker that fetches the size, line-size and associativity
 * of the L2 cache
 */
static int
intel_l2cinfo(void *arg, const struct cachetab *ct)
{
	struct l2info *l2i = arg;
	int *ip;

	if (ct->ct_label != l2_cache_str &&
	    ct->ct_label != sl2_cache_str)
		return (0);	/* not an L2 -- keep walking */

	if ((ip = l2i->l2i_csz) != NULL)
		*ip = ct->ct_size;
	if ((ip = l2i->l2i_lsz) != NULL)
		*ip = ct->ct_line_size;
	if ((ip = l2i->l2i_assoc) != NULL)
		*ip = ct->ct_assoc;
	l2i->l2i_ret = ct->ct_size;
	return (1);		/* was an L2 -- terminate walk */
}

/*
 * AMD L2/L3 Cache and TLB Associativity Field Definition:
 *
 *	Unlike the associativity for the L1 cache and tlb where the 8 bit
 *	value is the associativity, the associativity for the L2 cache and
 *	tlb is encoded in the following table. The 4 bit L2 value serves as
 *	an index into the amd_afd[] array to determine the associativity.
 *	-1 is undefined. 0 is fully associative.
 */

static int amd_afd[] =
	{-1, 1, 2, -1, 4, -1, 8, -1, 16, -1, 32, 48, 64, 96, 128, 0};

static void
amd_l2cacheinfo(struct cpuid_info *cpi, struct l2info *l2i)
{
	struct cpuid_regs *cp;
	uint_t size, assoc;
	int i;
	int *ip;

	if (cpi->cpi_xmaxeax < 0x80000006)
		return;
	cp = &cpi->cpi_extd[6];

	if ((i = BITX(cp->cp_ecx, 15, 12)) != 0 &&
	    (size = BITX(cp->cp_ecx, 31, 16)) != 0) {
		uint_t cachesz = size * 1024;
		assoc = amd_afd[i];

		ASSERT(assoc != -1);

		if ((ip = l2i->l2i_csz) != NULL)
			*ip = cachesz;
		if ((ip = l2i->l2i_lsz) != NULL)
			*ip = BITX(cp->cp_ecx, 7, 0);
		if ((ip = l2i->l2i_assoc) != NULL)
			*ip = assoc;
		l2i->l2i_ret = cachesz;
	}
}

int
getl2cacheinfo(cpu_t *cpu, int *csz, int *lsz, int *assoc)
{
	struct cpuid_info *cpi = cpu->cpu_m.mcpu_cpi;
	struct l2info __l2info, *l2i = &__l2info;

	l2i->l2i_csz = csz;
	l2i->l2i_lsz = lsz;
	l2i->l2i_assoc = assoc;
	l2i->l2i_ret = -1;

	switch (x86_which_cacheinfo(cpi)) {
	case X86_VENDOR_Intel:
		intel_walk_cacheinfo(cpi, l2i, intel_l2cinfo);
		break;
	case X86_VENDOR_Cyrix:
		cyrix_walk_cacheinfo(cpi, l2i, intel_l2cinfo);
		break;
	case X86_VENDOR_AMD:
		amd_l2cacheinfo(cpi, l2i);
		break;
	default:
		break;
	}
	return (l2i->l2i_ret);
}

#if !defined(__xpv)

uint32_t *
cpuid_mwait_alloc(cpu_t *cpu)
{
	uint32_t	*ret;
	size_t		mwait_size;

	ASSERT(cpuid_checkpass(cpu, 2));

	mwait_size = cpu->cpu_m.mcpu_cpi->cpi_mwait.mon_max;
	if (mwait_size == 0)
		return (NULL);

	/*
	 * kmem_alloc() returns cache line size aligned data for mwait_size
	 * allocations.  mwait_size is currently cache line sized.  Neither
	 * of these implementation details are guarantied to be true in the
	 * future.
	 *
	 * First try allocating mwait_size as kmem_alloc() currently returns
	 * correctly aligned memory.  If kmem_alloc() does not return
	 * mwait_size aligned memory, then use mwait_size ROUNDUP.
	 *
	 * Set cpi_mwait.buf_actual and cpi_mwait.size_actual in case we
	 * decide to free this memory.
	 */
	ret = kmem_zalloc(mwait_size, KM_SLEEP);
	if (ret == (uint32_t *)P2ROUNDUP((uintptr_t)ret, mwait_size)) {
		cpu->cpu_m.mcpu_cpi->cpi_mwait.buf_actual = ret;
		cpu->cpu_m.mcpu_cpi->cpi_mwait.size_actual = mwait_size;
		*ret = MWAIT_RUNNING;
		return (ret);
	} else {
		kmem_free(ret, mwait_size);
		ret = kmem_zalloc(mwait_size * 2, KM_SLEEP);
		cpu->cpu_m.mcpu_cpi->cpi_mwait.buf_actual = ret;
		cpu->cpu_m.mcpu_cpi->cpi_mwait.size_actual = mwait_size * 2;
		ret = (uint32_t *)P2ROUNDUP((uintptr_t)ret, mwait_size);
		*ret = MWAIT_RUNNING;
		return (ret);
	}
}

void
cpuid_mwait_free(cpu_t *cpu)
{
	ASSERT(cpuid_checkpass(cpu, 2));

	if (cpu->cpu_m.mcpu_cpi->cpi_mwait.buf_actual != NULL &&
	    cpu->cpu_m.mcpu_cpi->cpi_mwait.size_actual > 0) {
		kmem_free(cpu->cpu_m.mcpu_cpi->cpi_mwait.buf_actual,
		    cpu->cpu_m.mcpu_cpi->cpi_mwait.size_actual);
	}

	cpu->cpu_m.mcpu_cpi->cpi_mwait.buf_actual = NULL;
	cpu->cpu_m.mcpu_cpi->cpi_mwait.size_actual = 0;
}

void
patch_tsc_read(int flag)
{
	size_t cnt;
	switch (flag) {
	case X86_NO_TSC:
		cnt = &_no_rdtsc_end - &_no_rdtsc_start;
		(void) memcpy((void *)tsc_read, (void *)&_no_rdtsc_start, cnt);
		break;
	case X86_HAVE_TSCP:
		cnt = &_tscp_end - &_tscp_start;
		(void) memcpy((void *)tsc_read, (void *)&_tscp_start, cnt);
		break;
	case X86_TSC_MFENCE:
		cnt = &_tsc_mfence_end - &_tsc_mfence_start;
		(void) memcpy((void *)tsc_read,
		    (void *)&_tsc_mfence_start, cnt);
		break;
	case X86_TSC_LFENCE:
		cnt = &_tsc_lfence_end - &_tsc_lfence_start;
		(void) memcpy((void *)tsc_read,
		    (void *)&_tsc_lfence_start, cnt);
		break;
	default:
		break;
	}
}

#endif	/* !__xpv */