/* Public domain. */

#ifndef _ASM_CPUFEATURE_H
#define _ASM_CPUFEATURE_H

#if defined(__amd64__) || defined(__i386__)

#include <sys/param.h>

#define X86_FEATURE_CLFLUSH     1
#define X86_FEATURE_XMM4_1      2
#define X86_FEATURE_PAT         3
#define X86_FEATURE_HYPERVISOR  4

static inline bool
static_cpu_has(uint16_t f)
{
        switch (f) {
        case X86_FEATURE_XMM4_1:
                return (cpu_ecxfeature & CPUIDECX_SSE41) != 0;
#ifdef __amd64__
        case X86_FEATURE_CLFLUSH:
        case X86_FEATURE_PAT:
                return true;
#else
        case X86_FEATURE_CLFLUSH:
                return curcpu()->ci_cflushsz != 0;
        case X86_FEATURE_PAT:
                return (curcpu()->ci_feature_flags & CPUID_PAT) != 0;
#endif
        case X86_FEATURE_HYPERVISOR:
                return (cpu_ecxfeature & CPUIDECX_HV) != 0;
        default:
                return false;
        }
}

static inline bool
pat_enabled(void)
{
        return static_cpu_has(X86_FEATURE_PAT);
}

#define boot_cpu_has(x) static_cpu_has(x)

static inline void
clflushopt(volatile void *addr)
{
        if (curcpu()->ci_feature_sefflags_ebx & SEFF0EBX_CLFLUSHOPT)
                __asm volatile("clflushopt %0" : "+m" (*(volatile char *)addr));
        else
                __asm volatile("clflush %0" : "+m" (*(volatile char *)addr));
}

#endif

#endif