#include "cpuid.h"
#include <string.h>
-#include <stdio.h>
enum {
CPU_PROC_BRAND_STRING_INTERNAL0 = 0x80000003,
}
#endif
-static struct {
- uint32_t feature;
- uint32_t mask;
- bool use_edx; /* ecx will be used if false. */
-} features[] = {
- { CF_MMX, 1 << 23, true },
- { CF_SSE, 1 << 25, true },
- { CF_SSE2, 1 << 26, true },
- { CF_SSE3, 1 << 9, false },
- { CF_FPU, 1 << 0, true },
-
- { CF_TSC, 1 << 4, true },
- { CF_MSR, 1 << 5, true },
-
- { CF_SSSE3, 1 << 9, false },
- { CF_AVX, 1 << 28, false },
-
- /* Extended ones. */
- { CEF_x64, 1 << 30, true },
- { CEF_FPU, 1 << 0, true },
- { CEF_DE, 1 << 2, true },
- { CEF_SYSCALLRET, 1 << 11, true },
- { CEF_CMOV, 1 << 15, true },
-
- { CEF_SSE4a, 1 << 6, false },
- { CEF_FMA4, 1 << 16, false },
- { CEF_XOP, 1 << 11, false }
-};
-
bool cpuid_is_supported(void)
{
int ret = 0;
pushfd
pop eax
xor eax, ecx
- shr eax, 0x21
- and eax, 0x1
+ shr eax, 21
+ and eax, 1
push ecx
popfd
return (feature <= cpuid_highest_ext_func_supported());
}
-bool cpuid_has_feature(int feature, bool extended)
+bool cpuid_has_ecxfeature(int feature)
{
- uint32_t eax, ebx, ecx, edx, i;
-
- if (!extended)
- ___cpuid(CPU_PROCINFO_AND_FEATUREBITS, &eax, &ebx, &ecx, &edx);
- else
- ___cpuid(CPU_EXTENDED_PROC_INFO_FEATURE_BITS, &eax, &ebx, &ecx, &edx);
-
- for (i = 0; i < sizeof(features) / sizeof(features[0]); ++i) {
- if (features[i].feature == feature) {
- if (features[i].use_edx)
- return (edx & features[i].mask);
- else
- return (ecx & features[i].mask);
- }
+ static uint32_t _ecx;
+ if (_ecx == 0) {
+#if defined(__GNUC__) || defined(__clang__)
+ asm volatile(
+ "cpuid\n\t"
+ : "=c" (_ecx)
+ : "a" (CPU_PROCINFO_AND_FEATUREBITS)
+ );
+#elif defined _MSC_VER
+ __asm {
+ mov eax, CPU_PROCINFO_AND_FEATUREBITS
+ cpuid
+ mov _ecx, ecx
+ };
+#endif
+ }
+
+ return (_ecx & feature) == feature;
+}
+
+bool cpuid_has_edxfeature(int feature)
+{
+ static uint32_t _edx;
+ if (_edx == 0) {
+#if defined(__GNUC__) || defined(__clang__)
+ asm volatile(
+ "cpuid\n\t"
+ : "=d" (_edx)
+ : "a" (CPU_PROCINFO_AND_FEATUREBITS)
+ );
+#elif defined _MSC_VER
+ __asm {
+ mov eax, CPU_PROCINFO_AND_FEATUREBITS
+ cpuid
+ mov _edx, edx
+ };
+#endif
}
- return false;
+
+ return (_edx & feature) == feature;
}
static const char *const cpuids[] = {
buf[5] = edx; /* Feature flags #1. */
buf[6] = ecx; /* Feature flags #2. */
- buf[7] = ebx; /* Additional feature information. */
+
+ /* Additional Feature information. */
+ buf[7] = ebx & 0xFF;
+ buf[8] = (ebx >> 8) & 0xFF;
+ buf[9] = (ebx >> 16) & 0xFF;
+ buf[10] = (ebx >> 24) & 0xFF;
break;
case CPU_CACHE_AND_TLBD_INFO:
buf[0] = eax;