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#ifndef _CPU_H
#define _CPU_H
#include <stdbool.h>
#include <stdint.h>
#include <klibc/compiler.h>
static inline uint64_t rdtsc(void)
{
uint64_t v;
asm volatile("rdtsc" : "=A" (v));
return v;
}
static inline uint32_t rdtscl(void)
{
uint32_t v;
asm volatile("rdtsc" : "=a" (v) : : "edx");
return v;
}
static inline void cpuid_count(uint32_t op, uint32_t cnt,
uint32_t *eax, uint32_t *ebx,
uint32_t *ecx, uint32_t *edx)
{
asm("cpuid"
: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
: "a" (op), "c" (cnt));
}
static inline void cpuid(uint32_t op, uint32_t *eax, uint32_t *ebx,
uint32_t *ecx, uint32_t *edx)
{
cpuid_count(op, 0, eax, ebx, ecx, edx);
}
static inline __constfunc uint32_t cpuid_eax(uint32_t level)
{
uint32_t v;
asm("cpuid" : "=a" (v) : "a" (level) : "ebx", "ecx", "edx");
return v;
}
static inline __constfunc uint32_t cpuid_ebx(uint32_t level)
{
uint32_t v;
asm("cpuid" : "=b" (v), "+a" (level) : : "ecx", "edx");
return v;
}
static inline __constfunc uint32_t cpuid_ecx(uint32_t level)
{
uint32_t v;
asm("cpuid" : "=c" (v), "+a" (level) : : "ebx", "edx");
return v;
}
static inline __constfunc uint32_t cpuid_edx(uint32_t level)
{
uint32_t v;
asm("cpuid" : "=d" (v), "+a" (level) : : "ebx", "ecx");
return v;
}
/* Standard macro to see if a specific flag is changeable */
static inline __constfunc bool cpu_has_eflag(uint32_t flag)
{
uint32_t f1, f2;
asm("pushfl\n\t"
"pushfl\n\t"
"popl %0\n\t"
"movl %0,%1\n\t"
"xorl %2,%0\n\t"
"pushl %0\n\t"
"popfl\n\t"
"pushfl\n\t"
"popl %0\n\t"
"popfl\n\t"
: "=&r" (f1), "=&r" (f2)
: "ir" (flag));
return ((f1^f2) & flag) != 0;
}
static inline uint64_t rdmsr(uint32_t msr)
{
uint64_t v;
asm volatile("rdmsr" : "=A" (v) : "c" (msr));
return v;
}
static inline void wrmsr(uint64_t v, uint32_t msr)
{
asm volatile("wrmsr" : : "A" (v), "c" (msr));
}
static inline void cpu_relax(void)
{
asm volatile("rep ; nop");
}
/* These are local cli/sti; not SMP-safe!!! */
static inline void cli(void)
{
asm volatile("cli");
}
static inline void sti(void)
{
asm volatile("sti");
}
#endif
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