cpufunc.h

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2003 Peter Wemm.
 * Copyright (c) 1993 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Functions to provide access to special i386 instructions.
 * This in included in sys/systm.h, and that file should be
 * used in preference to this.
 */

#ifdef __i386__
#include <i386/cpufunc.h>
#else /* !__i386__ */

#ifndef _MACHINE_CPUFUNC_H_
#define	_MACHINE_CPUFUNC_H_

struct region_descriptor;

#define readb(va)	(*(volatile uint8_t *) (va))
#define readw(va)	(*(volatile uint16_t *) (va))
#define readl(va)	(*(volatile uint32_t *) (va))
#define readq(va)	(*(volatile uint64_t *) (va))

#define writeb(va, d)	(*(volatile uint8_t *) (va) = (d))
#define writew(va, d)	(*(volatile uint16_t *) (va) = (d))
#define writel(va, d)	(*(volatile uint32_t *) (va) = (d))
#define writeq(va, d)	(*(volatile uint64_t *) (va) = (d))

static __inline void
breakpoint(void)
{
	__asm __volatile("int $3");
}

#define	bsfl(mask)	__builtin_ctz(mask)

#define	bsfq(mask)	__builtin_ctzl(mask)

static __inline void
clflush(u_long addr)
{

	__asm __volatile("clflush %0" : : "m" (*(char *)addr));
}

static __inline void
clflushopt(u_long addr)
{

	__asm __volatile("clflushopt %0" : : "m" (*(char *)addr));
}

static __inline void
clwb(u_long addr)
{

	__asm __volatile("clwb %0" : : "m" (*(char *)addr));
}

static __inline void
clts(void)
{

	__asm __volatile("clts");
}

static __inline void
disable_intr(void)
{
	__asm __volatile("cli" : : : "memory");
}

static __inline void
do_cpuid(u_int ax, u_int *p)
{
	__asm __volatile("cpuid"
	    : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
	    :  "0" (ax));
}

static __inline void
cpuid_count(u_int ax, u_int cx, u_int *p)
{
	__asm __volatile("cpuid"
	    : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
	    :  "0" (ax), "c" (cx));
}

static __inline void
enable_intr(void)
{
	__asm __volatile("sti");
}

static __inline void
halt(void)
{
	__asm __volatile("hlt");
}

static __inline u_char
inb(u_int port)
{
	u_char	data;

	__asm __volatile("inb %w1, %0" : "=a" (data) : "Nd" (port));
	return (data);
}

static __inline u_int
inl(u_int port)
{
	u_int	data;

	__asm __volatile("inl %w1, %0" : "=a" (data) : "Nd" (port));
	return (data);
}

static __inline void
insb(u_int port, void *addr, size_t count)
{
	__asm __volatile("rep; insb"
			 : "+D" (addr), "+c" (count)
			 : "d" (port)
			 : "memory");
}

static __inline void
insw(u_int port, void *addr, size_t count)
{
	__asm __volatile("rep; insw"
			 : "+D" (addr), "+c" (count)
			 : "d" (port)
			 : "memory");
}

static __inline void
insl(u_int port, void *addr, size_t count)
{
	__asm __volatile("rep; insl"
			 : "+D" (addr), "+c" (count)
			 : "d" (port)
			 : "memory");
}

static __inline void
invd(void)
{
	__asm __volatile("invd");
}

static __inline u_short
inw(u_int port)
{
	u_short	data;

	__asm __volatile("inw %w1, %0" : "=a" (data) : "Nd" (port));
	return (data);
}

static __inline void
outb(u_int port, u_char data)
{
	__asm __volatile("outb %0, %w1" : : "a" (data), "Nd" (port));
}

static __inline void
outl(u_int port, u_int data)
{
	__asm __volatile("outl %0, %w1" : : "a" (data), "Nd" (port));
}

static __inline void
outsb(u_int port, const void *addr, size_t count)
{
	__asm __volatile("rep; outsb"
			 : "+S" (addr), "+c" (count)
			 : "d" (port));
}

static __inline void
outsw(u_int port, const void *addr, size_t count)
{
	__asm __volatile("rep; outsw"
			 : "+S" (addr), "+c" (count)
			 : "d" (port));
}

static __inline void
outsl(u_int port, const void *addr, size_t count)
{
	__asm __volatile("rep; outsl"
			 : "+S" (addr), "+c" (count)
			 : "d" (port));
}

static __inline void
outw(u_int port, u_short data)
{
	__asm __volatile("outw %0, %w1" : : "a" (data), "Nd" (port));
}

static __inline u_long
popcntq(u_long mask)
{
	u_long result;

	__asm __volatile("popcntq %1,%0" : "=r" (result) : "rm" (mask));
	return (result);
}

static __inline void
lfence(void)
{

	__asm __volatile("lfence" : : : "memory");
}

static __inline void
mfence(void)
{

	__asm __volatile("mfence" : : : "memory");
}

static __inline void
sfence(void)
{

	__asm __volatile("sfence" : : : "memory");
}

static __inline void
ia32_pause(void)
{
	__asm __volatile("pause");
}

static __inline u_long
read_rflags(void)
{
	u_long	rf;

	__asm __volatile("pushfq; popq %0" : "=r" (rf));
	return (rf);
}

static __inline uint64_t
rdmsr(u_int msr)
{
	uint32_t low, high;

	__asm __volatile("rdmsr" : "=a" (low), "=d" (high) : "c" (msr));
	return (low | ((uint64_t)high << 32));
}

static __inline uint32_t
rdmsr32(u_int msr)
{
	uint32_t low;

	__asm __volatile("rdmsr" : "=a" (low) : "c" (msr) : "rdx");
	return (low);
}

static __inline uint64_t
rdpmc(u_int pmc)
{
	uint32_t low, high;

	__asm __volatile("rdpmc" : "=a" (low), "=d" (high) : "c" (pmc));
	return (low | ((uint64_t)high << 32));
}

static __inline uint64_t
rdtsc(void)
{
	uint32_t low, high;

	__asm __volatile("rdtsc" : "=a" (low), "=d" (high));
	return (low | ((uint64_t)high << 32));
}

static __inline uint64_t
rdtsc_ordered_lfence(void)
{
	lfence();
	return (rdtsc());
}

static __inline uint64_t
rdtsc_ordered_mfence(void)
{
	mfence();
	return (rdtsc());
}

static __inline uint64_t
rdtscp(void)
{
	uint32_t low, high;

	__asm __volatile("rdtscp" : "=a" (low), "=d" (high) : : "ecx");
	return (low | ((uint64_t)high << 32));
}

static __inline uint64_t
rdtscp_aux(uint32_t *aux)
{
	uint32_t low, high;

	__asm __volatile("rdtscp" : "=a" (low), "=d" (high), "=c" (*aux));
	return (low | ((uint64_t)high << 32));
}

static __inline uint32_t
rdtsc32(void)
{
	uint32_t rv;

	__asm __volatile("rdtsc" : "=a" (rv) : : "edx");
	return (rv);
}

static __inline uint32_t
rdtscp32(void)
{
	uint32_t rv;

	__asm __volatile("rdtscp" : "=a" (rv) : : "ecx", "edx");
	return (rv);
}

static __inline void
wbinvd(void)
{
	__asm __volatile("wbinvd");
}

static __inline void
write_rflags(u_long rf)
{
	__asm __volatile("pushq %0;  popfq" : : "r" (rf));
}

static __inline void
wrmsr(u_int msr, uint64_t newval)
{
	uint32_t low, high;

	low = newval;
	high = newval >> 32;
	__asm __volatile("wrmsr" : : "a" (low), "d" (high), "c" (msr));
}

static __inline void
load_cr0(u_long data)
{

	__asm __volatile("movq %0,%%cr0" : : "r" (data));
}

static __inline u_long
rcr0(void)
{
	u_long	data;

	__asm __volatile("movq %%cr0,%0" : "=r" (data));
	return (data);
}

static __inline u_long
rcr2(void)
{
	u_long	data;

	__asm __volatile("movq %%cr2,%0" : "=r" (data));
	return (data);
}

static __inline void
load_cr3(u_long data)
{

	__asm __volatile("movq %0,%%cr3" : : "r" (data) : "memory");
}

static __inline u_long
rcr3(void)
{
	u_long	data;

	__asm __volatile("movq %%cr3,%0" : "=r" (data));
	return (data);
}

static __inline void
load_cr4(u_long data)
{
	__asm __volatile("movq %0,%%cr4" : : "r" (data));
}

static __inline u_long
rcr4(void)
{
	u_long	data;

	__asm __volatile("movq %%cr4,%0" : "=r" (data));
	return (data);
}

static __inline u_long
rxcr(u_int reg)
{
	u_int low, high;

	__asm __volatile("xgetbv" : "=a" (low), "=d" (high) : "c" (reg));
	return (low | ((uint64_t)high << 32));
}

static __inline void
load_xcr(u_int reg, u_long val)
{
	u_int low, high;

	low = val;
	high = val >> 32;
	__asm __volatile("xsetbv" : : "c" (reg), "a" (low), "d" (high));
}

/*
 * Global TLB flush (except for thise for pages marked PG_G)
 */
static __inline void
invltlb(void)
{

	load_cr3(rcr3());
}

#ifndef CR4_PGE
#define	CR4_PGE	0x00000080	/* Page global enable */
#endif

/*
 * Perform the guaranteed invalidation of all TLB entries.  This
 * includes the global entries, and entries in all PCIDs, not only the
 * current context.  The function works both on non-PCID CPUs and CPUs
 * with the PCID turned off or on.  See IA-32 SDM Vol. 3a 4.10.4.1
 * Operations that Invalidate TLBs and Paging-Structure Caches.
 */
static __inline void
invltlb_glob(void)
{
	uint64_t cr4;

	cr4 = rcr4();
	load_cr4(cr4 & ~CR4_PGE);
	/*
	 * Although preemption at this point could be detrimental to
	 * performance, it would not lead to an error.  PG_G is simply
	 * ignored if CR4.PGE is clear.  Moreover, in case this block
	 * is re-entered, the load_cr4() either above or below will
	 * modify CR4.PGE flushing the TLB.
	 */
	load_cr4(cr4 | CR4_PGE);
}

/*
 * TLB flush for an individual page (even if it has PG_G).
 * Only works on 486+ CPUs (i386 does not have PG_G).
 */
static __inline void
invlpg(u_long addr)
{

	__asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory");
}

#define	INVPCID_ADDR	0
#define	INVPCID_CTX	1
#define	INVPCID_CTXGLOB	2
#define	INVPCID_ALLCTX	3

struct invpcid_descr {
	uint64_t	pcid:12 __packed;
	uint64_t	pad:52 __packed;
	uint64_t	addr;
} __packed;

static __inline void
invpcid(struct invpcid_descr *d, int type)
{

	__asm __volatile("invpcid (%0),%1"
	    : : "r" (d), "r" ((u_long)type) : "memory");
}

#define	INVLPGB_VA		0x0001
#define	INVLPGB_PCID		0x0002
#define	INVLPGB_ASID		0x0004
#define	INVLPGB_GLOB		0x0008
#define	INVLPGB_FIN		0x0010
#define	INVLPGB_NEST		0x0020

#define	INVLPGB_DESCR(asid, pcid)	(((pcid) << 16) | (asid))

#define	INVLPGB_2M_CNT		(1u << 31)

static __inline void
invlpgb(uint64_t rax, uint32_t edx, uint32_t ecx)
{
	__asm __volatile("invlpgb" : : "a" (rax), "d" (edx), "c" (ecx));
}

static __inline void
tlbsync(void)
{
	__asm __volatile("tlbsync");
}

static __inline u_short
rfs(void)
{
	u_short sel;
	__asm __volatile("movw %%fs,%0" : "=rm" (sel));
	return (sel);
}

static __inline u_short
rgs(void)
{
	u_short sel;
	__asm __volatile("movw %%gs,%0" : "=rm" (sel));
	return (sel);
}

static __inline u_short
rss(void)
{
	u_short sel;
	__asm __volatile("movw %%ss,%0" : "=rm" (sel));
	return (sel);
}

static __inline u_short
rcs(void)
{
	u_short sel;

	__asm __volatile("movw %%cs,%0" : "=rm" (sel));
	return (sel);
}

static __inline void
load_ds(u_short sel)
{
	__asm __volatile("movw %0,%%ds" : : "rm" (sel));
}

static __inline void
load_es(u_short sel)
{
	__asm __volatile("movw %0,%%es" : : "rm" (sel));
}

static __inline void
cpu_monitor(const void *addr, u_long extensions, u_int hints)
{

	__asm __volatile("monitor"
	    : : "a" (addr), "c" (extensions), "d" (hints));
}

static __inline void
cpu_mwait(u_long extensions, u_int hints)
{

	__asm __volatile("mwait" : : "a" (hints), "c" (extensions));
}

static __inline uint32_t
rdpkru(void)
{
	uint32_t res;

	__asm __volatile("rdpkru" :  "=a" (res) : "c" (0) : "edx");
	return (res);
}

static __inline void
wrpkru(uint32_t mask)
{

	__asm __volatile("wrpkru" :  : "a" (mask),  "c" (0), "d" (0));
}

#ifdef _KERNEL
/* This is defined in <machine/specialreg.h> but is too painful to get to */
#ifndef	MSR_FSBASE
#define	MSR_FSBASE	0xc0000100
#endif
static __inline void
load_fs(u_short sel)
{
	/* Preserve the fsbase value across the selector load */
	__asm __volatile("rdmsr; movw %0,%%fs; wrmsr"
	    : : "rm" (sel), "c" (MSR_FSBASE) : "eax", "edx");
}

#ifndef	MSR_GSBASE
#define	MSR_GSBASE	0xc0000101
#endif
static __inline void
load_gs(u_short sel)
{
	/*
	 * Preserve the gsbase value across the selector load.
	 * Note that we have to disable interrupts because the gsbase
	 * being trashed happens to be the kernel gsbase at the time.
	 */
	__asm __volatile("pushfq; cli; rdmsr; movw %0,%%gs; wrmsr; popfq"
	    : : "rm" (sel), "c" (MSR_GSBASE) : "eax", "edx");
}
#else
/* Usable by userland */
static __inline void
load_fs(u_short sel)
{
	__asm __volatile("movw %0,%%fs" : : "rm" (sel));
}

static __inline void
load_gs(u_short sel)
{
	__asm __volatile("movw %0,%%gs" : : "rm" (sel));
}
#endif

static __inline uint64_t
rdfsbase(void)
{
	uint64_t x;

	__asm __volatile("rdfsbase %0" : "=r" (x));
	return (x);
}

static __inline void
wrfsbase(uint64_t x)
{

	__asm __volatile("wrfsbase %0" : : "r" (x));
}

static __inline uint64_t
rdgsbase(void)
{
	uint64_t x;

	__asm __volatile("rdgsbase %0" : "=r" (x));
	return (x);
}

static __inline void
wrgsbase(uint64_t x)
{

	__asm __volatile("wrgsbase %0" : : "r" (x));
}

static __inline void
bare_lgdt(struct region_descriptor *addr)
{
	__asm __volatile("lgdt (%0)" : : "r" (addr));
}

static __inline void
sgdt(struct region_descriptor *addr)
{
	char *loc;

	loc = (char *)addr;
	__asm __volatile("sgdt %0" : "=m" (*loc) : : "memory");
}

static __inline void
lidt(struct region_descriptor *addr)
{
	__asm __volatile("lidt (%0)" : : "r" (addr));
}

static __inline void
sidt(struct region_descriptor *addr)
{
	char *loc;

	loc = (char *)addr;
	__asm __volatile("sidt %0" : "=m" (*loc) : : "memory");
}

static __inline void
lldt(u_short sel)
{
	__asm __volatile("lldt %0" : : "r" (sel));
}

static __inline u_short
sldt(void)
{
	u_short sel;

	__asm __volatile("sldt %0" : "=r" (sel));
	return (sel);
}

static __inline void
ltr(u_short sel)
{
	__asm __volatile("ltr %0" : : "r" (sel));
}

static __inline uint32_t
read_tr(void)
{
	u_short sel;

	__asm __volatile("str %0" : "=r" (sel));
	return (sel);
}

static __inline uint64_t
rdr0(void)
{
	uint64_t data;
	__asm __volatile("movq %%dr0,%0" : "=r" (data));
	return (data);
}

static __inline void
load_dr0(uint64_t dr0)
{
	__asm __volatile("movq %0,%%dr0" : : "r" (dr0));
}

static __inline uint64_t
rdr1(void)
{
	uint64_t data;
	__asm __volatile("movq %%dr1,%0" : "=r" (data));
	return (data);
}

static __inline void
load_dr1(uint64_t dr1)
{
	__asm __volatile("movq %0,%%dr1" : : "r" (dr1));
}

static __inline uint64_t
rdr2(void)
{
	uint64_t data;
	__asm __volatile("movq %%dr2,%0" : "=r" (data));
	return (data);
}

static __inline void
load_dr2(uint64_t dr2)
{
	__asm __volatile("movq %0,%%dr2" : : "r" (dr2));
}

static __inline uint64_t
rdr3(void)
{
	uint64_t data;
	__asm __volatile("movq %%dr3,%0" : "=r" (data));
	return (data);
}

static __inline void
load_dr3(uint64_t dr3)
{
	__asm __volatile("movq %0,%%dr3" : : "r" (dr3));
}

static __inline uint64_t
rdr6(void)
{
	uint64_t data;
	__asm __volatile("movq %%dr6,%0" : "=r" (data));
	return (data);
}

static __inline void
load_dr6(uint64_t dr6)
{
	__asm __volatile("movq %0,%%dr6" : : "r" (dr6));
}

static __inline uint64_t
rdr7(void)
{
	uint64_t data;
	__asm __volatile("movq %%dr7,%0" : "=r" (data));
	return (data);
}

static __inline void
load_dr7(uint64_t dr7)
{
	__asm __volatile("movq %0,%%dr7" : : "r" (dr7));
}

static __inline register_t
intr_disable(void)
{
	register_t rflags;

	rflags = read_rflags();
	disable_intr();
	return (rflags);
}

static __inline void
intr_restore(register_t rflags)
{
	write_rflags(rflags);
}

static __inline void
stac(void)
{

	__asm __volatile("stac" : : : "cc");
}

static __inline void
clac(void)
{

	__asm __volatile("clac" : : : "cc");
}

enum {
	SGX_ECREATE	= 0x0,
	SGX_EADD	= 0x1,
	SGX_EINIT	= 0x2,
	SGX_EREMOVE	= 0x3,
	SGX_EDGBRD	= 0x4,
	SGX_EDGBWR	= 0x5,
	SGX_EEXTEND	= 0x6,
	SGX_ELDU	= 0x8,
	SGX_EBLOCK	= 0x9,
	SGX_EPA		= 0xA,
	SGX_EWB		= 0xB,
	SGX_ETRACK	= 0xC,
};

enum {
	SGX_PT_SECS = 0x00,
	SGX_PT_TCS  = 0x01,
	SGX_PT_REG  = 0x02,
	SGX_PT_VA   = 0x03,
	SGX_PT_TRIM = 0x04,
};

int sgx_encls(uint32_t eax, uint64_t rbx, uint64_t rcx, uint64_t rdx);

static __inline int
sgx_ecreate(void *pginfo, void *secs)
{

	return (sgx_encls(SGX_ECREATE, (uint64_t)pginfo,
	    (uint64_t)secs, 0));
}

static __inline int
sgx_eadd(void *pginfo, void *epc)
{

	return (sgx_encls(SGX_EADD, (uint64_t)pginfo,
	    (uint64_t)epc, 0));
}

static __inline int
sgx_einit(void *sigstruct, void *secs, void *einittoken)
{

	return (sgx_encls(SGX_EINIT, (uint64_t)sigstruct,
	    (uint64_t)secs, (uint64_t)einittoken));
}

static __inline int
sgx_eextend(void *secs, void *epc)
{

	return (sgx_encls(SGX_EEXTEND, (uint64_t)secs,
	    (uint64_t)epc, 0));
}

static __inline int
sgx_epa(void *epc)
{

	return (sgx_encls(SGX_EPA, SGX_PT_VA, (uint64_t)epc, 0));
}

static __inline int
sgx_eldu(uint64_t rbx, uint64_t rcx,
    uint64_t rdx)
{

	return (sgx_encls(SGX_ELDU, rbx, rcx, rdx));
}

static __inline int
sgx_eremove(void *epc)
{

	return (sgx_encls(SGX_EREMOVE, 0, (uint64_t)epc, 0));
}

static __inline void
xrstors(uint8_t *save_area, uint64_t state_bitmap)
{
	uint32_t low, hi;

	low = state_bitmap;
	hi = state_bitmap >> 32;
	__asm __volatile("xrstors %0" : : "m"(*save_area), "a"(low),
	    "d"(hi));
}

static __inline void
xsaves(uint8_t *save_area, uint64_t state_bitmap)
{
	uint32_t low, hi;

	low = state_bitmap;
	hi = state_bitmap >> 32;
	__asm __volatile("xsaves %0" : "=m"(*save_area) : "a"(low),
	    "d"(hi)
	    : "memory");
}

void	reset_dbregs(void);

#ifdef _KERNEL
int	rdmsr_safe(u_int msr, uint64_t *val);
int	wrmsr_safe(u_int msr, uint64_t newval);
#endif

#endif /* !_MACHINE_CPUFUNC_H_ */

#endif /* __i386__ */