xref: /titanic_51/usr/src/uts/i86pc/os/mlsetup.c (revision 22cc0e4546a86e916ddbd8e5a4bed0875afaa288)

/*
 * 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.
 */

#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/disp.h>
#include <sys/promif.h>
#include <sys/clock.h>
#include <sys/cpuvar.h>
#include <sys/stack.h>
#include <vm/as.h>
#include <vm/hat.h>
#include <sys/reboot.h>
#include <sys/avintr.h>
#include <sys/vtrace.h>
#include <sys/proc.h>
#include <sys/thread.h>
#include <sys/cpupart.h>
#include <sys/pset.h>
#include <sys/copyops.h>
#include <sys/pg.h>
#include <sys/disp.h>
#include <sys/debug.h>
#include <sys/sunddi.h>
#include <sys/x86_archext.h>
#include <sys/privregs.h>
#include <sys/machsystm.h>
#include <sys/ontrap.h>
#include <sys/bootconf.h>
#include <sys/kdi_machimpl.h>
#include <sys/archsystm.h>
#include <sys/promif.h>
#include <sys/bootconf.h>
#include <sys/kobj.h>
#include <sys/kobj_lex.h>
#include <sys/pci_cfgspace.h>
#ifdef __xpv
#include <sys/hypervisor.h>
#endif

/*
 * some globals for patching the result of cpuid
 * to solve problems w/ creative cpu vendors
 */

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

/*
 * Dummy spl priority masks
 */
static unsigned char dummy_cpu_pri[MAXIPL + 1] = {
	0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf,
	0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf
};


static uint32_t
bootprop_getval(char *name)
{
	char prop[32];
	u_longlong_t ll;
	extern struct bootops *bootops;
	if ((BOP_GETPROPLEN(bootops, name) > sizeof (prop)) ||
	    (BOP_GETPROP(bootops, name, prop) < 0) ||
	    (kobj_getvalue(prop, &ll) == -1))
		return (0);
	return ((uint32_t)ll);
}

/*
 * Setup routine called right before main(). Interposing this function
 * before main() allows us to call it in a machine-independent fashion.
 */
void
mlsetup(struct regs *rp)
{
	extern struct classfuncs sys_classfuncs;
	extern disp_t cpu0_disp;
	extern char t0stack[];
#if !defined(__xpv)
	extern int xpv_is_hvm;
#endif

	ASSERT_STACK_ALIGNED();

	/*
	 * initialize cpu_self
	 */
	cpu[0]->cpu_self = cpu[0];

#if defined(__xpv)
	/*
	 * Point at the hypervisor's virtual cpu structure
	 */
	cpu[0]->cpu_m.mcpu_vcpu_info = &HYPERVISOR_shared_info->vcpu_info[0];
#endif

	/*
	 * Set up dummy cpu_pri_data values till psm spl code is
	 * installed.  This allows splx() to work on amd64.
	 */

	cpu[0]->cpu_pri_data = dummy_cpu_pri;

	/*
	 * check if we've got special bits to clear or set
	 * when checking cpu features
	 */

	cpuid_feature_ecx_include =
	    bootprop_getval("cpuid_feature_ecx_include");
	cpuid_feature_ecx_exclude =
	    bootprop_getval("cpuid_feature_ecx_exclude");
	cpuid_feature_edx_include =
	    bootprop_getval("cpuid_feature_edx_include");
	cpuid_feature_edx_exclude =
	    bootprop_getval("cpuid_feature_edx_exclude");

	/*
	 * The first lightweight pass (pass0) through the cpuid data
	 * was done in locore before mlsetup was called.  Do the next
	 * pass in C code.
	 *
	 * The x86_feature bits are set here on the basis of the capabilities
	 * of the boot CPU.  Note that if we choose to support CPUs that have
	 * different feature sets (at which point we would almost certainly
	 * want to set the feature bits to correspond to the feature
	 * minimum) this value may be altered.
	 */
	x86_feature = cpuid_pass1(cpu[0]);

	/*
	 * Initialize idt0, gdt0, ldt0_default, ktss0 and dftss.
	 */
	init_desctbls();

#if !defined(__xpv)

	/*
	 * Patch the tsc_read routine with appropriate set of instructions,
	 * depending on the processor family and architecure, to read the
	 * time-stamp counter while ensuring no out-of-order execution.
	 * Patch it while the kernel text is still writable.
	 *
	 * Note: tsc_read is not patched for intel processors whose family
	 * is >6 and for amd whose family >f (in case they don't support rdtscp
	 * instruction, unlikely). By default tsc_read will use cpuid for
	 * serialization in such cases. The following code needs to be
	 * revisited if intel processors of family >= f retains the
	 * instruction serialization nature of mfence instruction.
	 * Note: tsc_read is not patched for x86 processors which do
	 * not support "mfence". By default tsc_read will use cpuid for
	 * serialization in such cases.
	 *
	 * The Xen hypervisor does not correctly report whether rdtscp is
	 * supported or not, so we must assume that it is not.
	 */
	if (xpv_is_hvm == 0 && (x86_feature & X86_TSCP))
		patch_tsc_read(X86_HAVE_TSCP);
	else if (cpuid_getvendor(CPU) == X86_VENDOR_AMD &&
	    cpuid_getfamily(CPU) <= 0xf && (x86_feature & X86_SSE2) != 0)
		patch_tsc_read(X86_TSC_MFENCE);
	else if (cpuid_getvendor(CPU) == X86_VENDOR_Intel &&
	    cpuid_getfamily(CPU) <= 6 && (x86_feature & X86_SSE2) != 0)
		patch_tsc_read(X86_TSC_LFENCE);

#endif	/* !__xpv */

#if defined(__i386) && !defined(__xpv)
	/*
	 * Some i386 processors do not implement the rdtsc instruction,
	 * or at least they do not implement it correctly. Patch them to
	 * return 0.
	 */
	if ((x86_feature & X86_TSC) == 0)
		patch_tsc_read(X86_NO_TSC);
#endif	/* __i386 && !__xpv */

#if defined(__amd64) && !defined(__xpv)
	patch_memops(cpuid_getvendor(CPU));
#endif	/* __amd64 && !__xpv */

#if !defined(__xpv)
	/* XXPV	what, if anything, should be dorked with here under xen? */

	/*
	 * While we're thinking about the TSC, let's set up %cr4 so that
	 * userland can issue rdtsc, and initialize the TSC_AUX value
	 * (the cpuid) for the rdtscp instruction on appropriately
	 * capable hardware.
	 */
	if (x86_feature & X86_TSC)
		setcr4(getcr4() & ~CR4_TSD);

	if (x86_feature & X86_TSCP)
		(void) wrmsr(MSR_AMD_TSCAUX, 0);

	if (x86_feature & X86_DE)
		setcr4(getcr4() | CR4_DE);
#endif /* __xpv */

	/*
	 * initialize t0
	 */
	t0.t_stk = (caddr_t)rp - MINFRAME;
	t0.t_stkbase = t0stack;
	t0.t_pri = maxclsyspri - 3;
	t0.t_schedflag = TS_LOAD | TS_DONT_SWAP;
	t0.t_procp = &p0;
	t0.t_plockp = &p0lock.pl_lock;
	t0.t_lwp = &lwp0;
	t0.t_forw = &t0;
	t0.t_back = &t0;
	t0.t_next = &t0;
	t0.t_prev = &t0;
	t0.t_cpu = cpu[0];
	t0.t_disp_queue = &cpu0_disp;
	t0.t_bind_cpu = PBIND_NONE;
	t0.t_bind_pset = PS_NONE;
	t0.t_bindflag = (uchar_t)default_binding_mode;
	t0.t_cpupart = &cp_default;
	t0.t_clfuncs = &sys_classfuncs.thread;
	t0.t_copyops = NULL;
	THREAD_ONPROC(&t0, CPU);

	lwp0.lwp_thread = &t0;
	lwp0.lwp_regs = (void *)rp;
	lwp0.lwp_procp = &p0;
	t0.t_tid = p0.p_lwpcnt = p0.p_lwprcnt = p0.p_lwpid = 1;

	p0.p_exec = NULL;
	p0.p_stat = SRUN;
	p0.p_flag = SSYS;
	p0.p_tlist = &t0;
	p0.p_stksize = 2*PAGESIZE;
	p0.p_stkpageszc = 0;
	p0.p_as = &kas;
	p0.p_lockp = &p0lock;
	p0.p_brkpageszc = 0;
	p0.p_t1_lgrpid = LGRP_NONE;
	p0.p_tr_lgrpid = LGRP_NONE;
	sigorset(&p0.p_ignore, &ignoredefault);

	CPU->cpu_thread = &t0;
	bzero(&cpu0_disp, sizeof (disp_t));
	CPU->cpu_disp = &cpu0_disp;
	CPU->cpu_disp->disp_cpu = CPU;
	CPU->cpu_dispthread = &t0;
	CPU->cpu_idle_thread = &t0;
	CPU->cpu_flags = CPU_READY | CPU_RUNNING | CPU_EXISTS | CPU_ENABLE;
	CPU->cpu_dispatch_pri = t0.t_pri;

	CPU->cpu_id = 0;

	CPU->cpu_pri = 12;		/* initial PIL for the boot CPU */

	/*
	 * The kernel doesn't use LDTs unless a process explicitly requests one.
	 */
	p0.p_ldt_desc = null_sdesc;

	/*
	 * Initialize thread/cpu microstate accounting
	 */
	init_mstate(&t0, LMS_SYSTEM);
	init_cpu_mstate(CPU, CMS_SYSTEM);

	/*
	 * Initialize lists of available and active CPUs.
	 */
	cpu_list_init(CPU);

	/*
	 * Now that we have taken over the GDT, IDT and have initialized
	 * active CPU list it's time to inform kmdb if present.
	 */
	if (boothowto & RB_DEBUG)
		kdi_idt_sync();

	/*
	 * If requested (boot -d) drop into kmdb.
	 *
	 * This must be done after cpu_list_init() on the 64-bit kernel
	 * since taking a trap requires that we re-compute gsbase based
	 * on the cpu list.
	 */
	if (boothowto & RB_DEBUGENTER)
		kmdb_enter();

	cpu_vm_data_init(CPU);

	/* lgrp_init() needs PCI config space access */
#if defined(__xpv)
	if (DOMAIN_IS_INITDOMAIN(xen_info))
		pci_cfgspace_init();
#else
	pci_cfgspace_init();
#endif

	rp->r_fp = 0;	/* terminate kernel stack traces! */

	prom_init("kernel", (void *)NULL);

	boot_ncpus = bootprop_getval("boot-ncpus");

	if (boot_ncpus <= 0 || boot_ncpus > NCPU)
		boot_ncpus = NCPU;

	max_ncpus = boot_max_ncpus = boot_ncpus;

	/*
	 * Initialize the lgrp framework
	 */
	lgrp_init();

	if (boothowto & RB_HALT) {
		prom_printf("unix: kernel halted by -h flag\n");
		prom_enter_mon();
	}

	ASSERT_STACK_ALIGNED();

	/*
	 * Fill out cpu_ucode_info.  Update microcode if necessary.
	 */
	ucode_check(CPU);

	if (workaround_errata(CPU) != 0)
		panic("critical workaround(s) missing for boot cpu");
}


void
mach_modpath(char *path, const char *filename)
{
	/*
	 * Construct the directory path from the filename.
	 */

	int len;
	char *p;
	const char isastr[] = "/amd64";
	size_t isalen = strlen(isastr);

	if ((p = strrchr(filename, '/')) == NULL)
		return;

	while (p > filename && *(p - 1) == '/')
		p--;	/* remove trailing '/' characters */
	if (p == filename)
		p++;	/* so "/" -is- the modpath in this case */

	/*
	 * Remove optional isa-dependent directory name - the module
	 * subsystem will put this back again (!)
	 */
	len = p - filename;
	if (len > isalen &&
	    strncmp(&filename[len - isalen], isastr, isalen) == 0)
		p -= isalen;

	/*
	 * "/platform/mumblefrotz" + " " + MOD_DEFPATH
	 */
	len += (p - filename) + 1 + strlen(MOD_DEFPATH) + 1;
	(void) strncpy(path, filename, p - filename);
}