visor/include/x86/cr.h

#ifndef _VISOR_CR_H_
#define _VISOR_CR_H_

#include <stdint.h>

#define CR4_VMXE (1 << 13)

static inline uint64_t
readcr0(void)
{
	uint64_t v;
	__asm__ ("mov %%cr0, %0\n\t" : "=a"(v));
	return v;
}

static inline uint64_t
readcr3(void)
{
	uint64_t v;
	__asm__ ("mov %%cr3, %0\n\t" : "=a"(v));
	return v;
}

static inline uint64_t
readcr4(void)
{
	uint64_t v;
	__asm__ ("mov %%cr4, %0\n\t" : "=a"(v));
	return v;
}

static inline void
writecr4(uint64_t v)
{
	__asm__ ("mov %0, %%cr4\n\t" :: "a"(v));
}

#endif