visor/include/x86/msr.h

#ifndef _VISOR_MSR_H_
#define _VISOR_MSR_H_

#include <stdint.h>

#define IA32_FEATURE_CONTROL        0x03A
#define IA32_DEBUGCTL               0x1D9
#define IA32_PAT                    0x277

#define IA32_VMX_BASIC              0x480
#define IA32_VMX_PINBASED_CTLS      0x481
#define IA32_VMX_PROCBASED_CTLS     0x482
#define IA32_VMX_EXIT_CTLS          0x483
#define IA32_VMX_ENTRY_CTLS         0x484
#define IA32_VMX_MISC               0x485
#define IA32_VMX_CR0_FIXED0         0x486
#define IA32_VMX_CR0_FIXED1         0x487
#define IA32_VMX_CR4_FIXED0         0x488
#define IA32_VMX_CR4_FIXED1         0x489
#define IA32_VMX_TRUE_ENTRY_CTLS    0x490
#define IA32_VMX_VMCS_ENUM          0x48A
#define IA32_VMX_PROCBASED_CTLS2     0x48B
#define IA32_VMX_TRUE_PINBASED_CTLS  0x48D
#define IA32_VMX_TRUE_PROCBASED_CTLS 0x48E
#define IA32_VMX_TRUE_EXIT_CTLS      0x48F

#define IA32_EFER                   0xC0000080
#define IA32_FS_BASE                0xC0000100
#define IA32_GS_BASE                0xC0000101
#define IA32_KERNEL_GS_BASE         0xC0000102

static inline uint32_t
readmsr32(uint32_t msr)
{
	uint32_t value;
	__asm__ ("rdmsr\n\t" : "=a"(value) : "c"(msr) : "edx");
	return value;
}

static inline uint64_t
readmsr64(uint32_t msr)
{
	uint32_t lo, hi;
	__asm__ ("rdmsr\n\t" : "=a"(lo), "=d"(hi) : "c"(msr));
	return lo | ((uint64_t)hi << 32);
}

static inline void
writemsr32(uint32_t msr, uint32_t value)
{
	uint32_t hi = 0;
	__asm__ ("wrmsr\n\t" :: "c"(msr), "a"(value), "d"(hi));
}

static inline void
writemsr64(uint32_t msr, uint64_t value)
{
	uint32_t lo = value, hi = value >> 32;
	__asm__ ("wrmsr\n\t" :: "c"(msr), "a"(lo), "d"(hi));
}

#endif