/*
 * 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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/*
 * Copyright 2019 Joyent, Inc.
 */

#ifndef	_SYS_MACHCPUVAR_H
#define	_SYS_MACHCPUVAR_H

#ifdef	__cplusplus
extern "C" {
#endif

#include <sys/inttypes.h>
#include <sys/x_call.h>
#include <sys/tss.h>
#include <sys/segments.h>
#include <sys/rm_platter.h>
#include <sys/avintr.h>
#include <sys/pte.h>
#include <sys/stddef.h>
#include <sys/debug.h>
#include <sys/cpuvar.h>

#ifndef	_ASM
/*
 * On a virtualized platform a virtual cpu may not be actually
 * on a physical cpu, especially in situations where a configuration has
 * more vcpus than pcpus.  This function tells us (if it's able) if the
 * specified vcpu is currently running on a pcpu.  Note if it is not
 * known or not able to determine, it will return the unknown state.
 */
#define	VCPU_STATE_UNKNOWN	0
#define	VCPU_ON_PCPU		1
#define	VCPU_NOT_ON_PCPU	2

extern int vcpu_on_pcpu(processorid_t);

/*
 * Machine specific fields of the cpu struct
 * defined in common/sys/cpuvar.h.
 *
 * Note:  This is kinda kludgy but seems to be the best
 * of our alternatives.
 */

struct cpuid_info;
struct cpu_ucode_info;
struct cmi_hdl;

/*
 * A note about the hypervisor affinity bits: a one bit in the affinity mask
 * means the corresponding event channel is allowed to be serviced
 * by this cpu.
 */
struct xen_evt_data {
	ulong_t		pending_sel[PIL_MAX + 1]; /* event array selectors */
	ulong_t		pending_evts[PIL_MAX + 1][sizeof (ulong_t) * 8];
	ulong_t		evt_affinity[sizeof (ulong_t) * 8]; /* service on cpu */
};

enum fast_syscall_state {
	FSS_DISABLED		= 0,
	FSS_ASYSC_ENABLED	= (1 << 0),
	FSS_SEP_ENABLED		= (1 << 1)
};

struct kpti_frame {
	uint64_t	kf_lower_redzone;

	/* Stashed value of %cr3 when we entered the trampoline. */
	greg_t		kf_tr_cr3;

	/*
	 * We use %r13-r14 as scratch registers in the trampoline code,
	 * so stash those here "below" the rest of the stack so they can be
	 * pushed/popped if needed.
	 */
	greg_t		kf_r14;
	greg_t		kf_r13;

	/*
	 * Part of this struct is used as the HW stack frame when taking an
	 * interrupt on the user page table. The CPU is going to push a bunch
	 * of regs onto the stack pointer set in the TSS/IDT (which we set to
	 * &kf_rsp here).
	 *
	 * This is only a temporary holding area for them (we'll move them over
	 * to the real interrupt stack once we've set %cr3).
	 *
	 * Note that these must be cleared during a process switch on this cpu.
	 */
	greg_t		kf_err;		/* Bottom of initial hw stack frame */
	greg_t		kf_rip;
	greg_t		kf_cs;
	greg_t		kf_rflags;
	greg_t		kf_rsp;
	greg_t		kf_ss;

	greg_t		kf_tr_rsp;	/* Top of HW stack frame */
	/* We also write this with the %rsp value on tramp entry */

	/* Written to 0x1 when this kpti_frame is in use. */
	uint64_t	kf_tr_flag;

	uint64_t	kf_middle_redzone;

	/*
	 * The things we need to write to %cr3 to change between page tables.
	 * These live "above" the HW stack.
	 */
	greg_t		kf_kernel_cr3;
	greg_t		kf_user_cr3;
	greg_t		kf_tr_ret_rsp;

	uint64_t	kf_unused;		/* For 16-byte align */

	uint64_t	kf_upper_redzone;
};

typedef struct cpu_smt {
	lock_t cs_lock;
	char cs_pad[56];
	struct cpu *cs_sib;
	volatile uint64_t cs_intr_depth;
	volatile uint64_t cs_state;
	volatile uint64_t cs_sibstate;
} cpu_smt_t;

/*
 * This first value, MACHCPU_SIZE is the size of all the members in the cpu_t
 * AND struct machcpu, before we get to the mcpu_pad and the kpti area.
 * The KPTI is used to contain per-CPU data that is visible in both sets of
 * page-tables, and hence must be page-aligned and page-sized. See
 * hat_pcp_setup().
 *
 * There are CTASSERTs in os/intr.c that verify this all works out.
 */
#define	MACHCPU_SIZE	(1568 + 696)
#define	MACHCPU_PAD	(MMU_PAGESIZE - MACHCPU_SIZE)
#define	MACHCPU_PAD2	(MMU_PAGESIZE - 16 - 3 * sizeof (struct kpti_frame))

struct	machcpu {
	/*
	 * x_call fields - used for interprocessor cross calls
	 */
	struct xc_msg	*xc_msgbox;
	struct xc_msg	*xc_curmsg;
	struct xc_msg	*xc_free;
	xc_data_t	xc_data;
	uint32_t	xc_wait_cnt;
	volatile uint32_t xc_work_cnt;

	int		mcpu_nodeid;		/* node-id */
	int		mcpu_pri;		/* CPU priority */

	struct hat	*mcpu_current_hat; /* cpu's current hat */

	struct hat_cpu_info	*mcpu_hat_info;

	volatile ulong_t	mcpu_tlb_info;

	/* i86 hardware table addresses that cannot be shared */

	user_desc_t	*mcpu_gdt;	/* GDT */
	gate_desc_t	*mcpu_idt;	/* current IDT */

	tss_t		*mcpu_tss;	/* TSS */
	void		*mcpu_ldt;
	size_t		mcpu_ldt_len;

	kmutex_t	mcpu_ppaddr_mutex;
	caddr_t		mcpu_caddr1;	/* per cpu CADDR1 */
	caddr_t		mcpu_caddr2;	/* per cpu CADDR2 */
	uint64_t	mcpu_caddr1pte;
	uint64_t	mcpu_caddr2pte;

	struct softint	mcpu_softinfo;
	uint64_t	pil_high_start[HIGH_LEVELS];
	uint64_t	intrstat[PIL_MAX + 1][2];

	struct cpuid_info	 *mcpu_cpi;

#if defined(__amd64)
	greg_t	mcpu_rtmp_rsp;		/* syscall: temporary %rsp stash */
	greg_t	mcpu_rtmp_r15;		/* syscall: temporary %r15 stash */
#endif

	struct vcpu_info *mcpu_vcpu_info;
	uint64_t	mcpu_gdtpa;	/* hypervisor: GDT physical address */

	uint16_t mcpu_intr_pending;	/* hypervisor: pending intrpt levels */
	uint16_t mcpu_ec_mbox;		/* hypervisor: evtchn_dev mailbox */
	struct xen_evt_data *mcpu_evt_pend; /* hypervisor: pending events */

	volatile uint32_t *mcpu_mwait;	/* MONITOR/MWAIT buffer */
	void (*mcpu_idle_cpu)(void);	/* idle function */
	uint16_t mcpu_idle_type;	/* CPU next idle type */
	uint16_t max_cstates;		/* supported max cstates */

	enum fast_syscall_state	mcpu_fast_syscall_state;

	struct cpu_ucode_info	*mcpu_ucode_info;

	void			*mcpu_pm_mach_state;
	struct cmi_hdl		*mcpu_cmi_hdl;
	void			*mcpu_mach_ctx_ptr;

	/*
	 * A stamp that is unique per processor and changes
	 * whenever an interrupt happens. Userful for detecting
	 * if a section of code gets interrupted.
	 * The high order 16 bits will hold the cpu->cpu_id.
	 * The low order bits will be incremented on every interrupt.
	 */
	volatile uint32_t	mcpu_istamp;

	cpu_smt_t		mcpu_smt;

	char			mcpu_pad[MACHCPU_PAD];

	/* This is the start of the page */
	char			mcpu_pad2[MACHCPU_PAD2];
	struct kpti_frame	mcpu_kpti;
	struct kpti_frame	mcpu_kpti_flt;
	struct kpti_frame	mcpu_kpti_dbg;
	char			mcpu_pad3[16];
};

#define	NINTR_THREADS	(LOCK_LEVEL-1)	/* number of interrupt threads */
#define	MWAIT_HALTED	(1)		/* mcpu_mwait set when halting */
#define	MWAIT_RUNNING	(0)		/* mcpu_mwait set to wakeup */
#define	MWAIT_WAKEUP_IPI	(2)	/* need IPI to wakeup */
#define	MWAIT_WAKEUP(cpu)	(*((cpu)->cpu_m.mcpu_mwait) = MWAIT_RUNNING)

#endif	/* _ASM */

/* Please DON'T add any more of this namespace-poisoning sewage here */

#define	cpu_nodeid cpu_m.mcpu_nodeid
#define	cpu_pri cpu_m.mcpu_pri
#define	cpu_current_hat cpu_m.mcpu_current_hat
#define	cpu_hat_info cpu_m.mcpu_hat_info
#define	cpu_ppaddr_mutex cpu_m.mcpu_ppaddr_mutex
#define	cpu_gdt cpu_m.mcpu_gdt
#define	cpu_idt cpu_m.mcpu_idt
#define	cpu_tss cpu_m.mcpu_tss
#define	cpu_caddr1 cpu_m.mcpu_caddr1
#define	cpu_caddr2 cpu_m.mcpu_caddr2
#define	cpu_softinfo cpu_m.mcpu_softinfo
#define	cpu_caddr1pte cpu_m.mcpu_caddr1pte
#define	cpu_caddr2pte cpu_m.mcpu_caddr2pte

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_MACHCPUVAR_H */