bool cpuid_is_supported(void)
{
+ int ret = 0;
+#if defined(__GNUC__) || defined(__clang__)
/* The following assembly code uses EAX as the return value,
* but we store the value of EAX into ret since GCC uses EAX
* as the return register for every C function. That's a double
#define ASM_PUSHECX "pushl %%ecx\n\t"
#endif
- int ret = 0;
asm volatile(
ASM_PUSHF
ASM_POPEAX
#undef ASM_PUSHEAX
#undef ASM_POPEAX
#undef ASM_PUSHECX
-
+#elif defined _MSC_VER
+ __asm {
+ pushfd
+ pop eax
+ mov ecx, eax
+ xor eax, 0x200000
+ push eax
+ popfd
+
+ pushfd
+ pop eax
+ xor eax, ecx
+ shr eax, 0x21
+ and eax, 0x1
+ push ecx
+ popfd
+
+ mov eax, ret
+ };
+#endif
return !!ret;
}
static uint32_t highest;
if (!highest) {
+#if defined(__GNUC__) || defined(__clang__)
asm volatile(
"cpuid\n\t"
: "=a" (highest)
: "a" (CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED)
);
+#elif defined _MSC_VER
+ __asm {
+ mov eax, CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED
+ cpuid
+ mov highest, eax
+ };
+#endif
}
return highest;