/* Only compile this file if we're on a x86 machine. */
#if defined(__i386__) || defined(__i386) || defined(__x86_64) \
|| defined(_M_AMD64) || defined(__M_X64)
-#include <stdint.h>
-#include <string.h>
-
#include "cpuid.h"
+#include <string.h>
+
enum {
CPU_PROC_BRAND_STRING_INTERNAL0 = 0x80000003,
CPU_PROC_BRAND_STRING_INTERNAL1 = 0x80000004
static struct {
int feature;
unsigned mask;
- int instruction; /* 0 = ecx, 1 = edx. */
+ bool use_edx; /* ecx will be used if false. */
} features[] = {
- { CF_MMX, 1 << 23, 1 },
- { CF_SSE, 1 << 25, 1 },
- { CF_SSE2, 1 << 26, 1 },
- { CF_SSE3, 1 << 9, 0 },
- { CF_FPU, 1 << 0, 1 },
+ { 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, 1 },
- { CF_MSR, 1 << 5, 1 },
+ { CF_TSC, 1 << 4, true },
+ { CF_MSR, 1 << 5, true },
- { CF_SSSE3, 1 << 9, 0 },
- { CF_AVX, 1 << 28, 0 },
+ { CF_SSSE3, 1 << 9, false },
+ { CF_AVX, 1 << 28, false },
/* Extended ones. */
- { CEF_x64, 1 << 30, 1 },
- { CEF_FPU, 1 << 0, 1 },
- { CEF_DE, 1 << 2, 1 },
- { CEF_SYSCALLRET, 1 << 11, 1 },
- { CEF_CMOV, 1 << 15, 1 },
-
- { CEF_SSE4a, 1 << 6, 0 },
- { CEF_FMA4, 1 << 16, 0 },
- { CEF_XOP, 1 << 11, 0 }
+ { 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 }
};
-static int has_feature(int feature, uint32_t ecx, uint32_t edx)
+static bool has_feature(int feature, uint32_t ecx, uint32_t edx)
{
int i;
for (i = 0; i < sizeof(features) / sizeof(features[0]); ++i) {
if (features[i].feature == feature) {
- if (features[i].instruction == 0)
- return (ecx & features[i].mask);
- else
+ if (features[i].use_edx)
return (edx & features[i].mask);
+ else
+ return (ecx & features[i].mask);
}
}
- return 0;
+ return false;
}
-int cpuid_test_feature(cpuid_t feature)
+bool cpuid_is_supported(void)
+{
+ int ret = 0;
+
+ asm volatile(
+ "pushfl\n\t"
+ "popl %%eax\n\t"
+ "movl %%eax, %%ecx\n\t"
+ "xorl $0x200000, %%eax\n\t"
+ "pushl %%eax\n\t"
+ "popfl\n\t"
+
+ "pushfl\n\t"
+ "popl %%eax\n\t"
+ "xorl %%ecx, %%eax\n\t"
+ "shrl $21, %%eax\n\t"
+ "andl $1, %%eax\n\t"
+ "pushl %%ecx\n\t"
+ "popfl\n\t"
+
+ : "=a" (ret)
+ );
+
+ return !!ret;
+}
+
+bool cpuid_test_feature(cpuid_t feature)
{
if (feature > CPU_VIRT_PHYS_ADDR_SIZES || feature < CPU_EXTENDED_PROC_INFO_FEATURE_BITS)
- return 0;
+ return false;
return (feature <= cpuid_highest_ext_func_supported());
}
-int cpuid_has_feature(int feature, int extended)
+bool cpuid_has_feature(int feature, bool extended)
{
uint32_t eax, ebx, ecx, edx;
- if (extended == 0)
+ if (!extended)
___cpuid(CPU_PROCINFO_AND_FEATUREBITS, &eax, &ebx, &ecx, &edx);
else
___cpuid(CPU_EXTENDED_PROC_INFO_FEATURE_BITS, &eax, &ebx, &ecx, &edx);
return cpuids[(int)cputype];
}
-int cpuid_highest_ext_func_supported(void)
+uint32_t cpuid_highest_ext_func_supported(void)
{
- static int highest;
+ static uint32_t highest;
if (!highest) {
asm volatile(
return highest;
}
-void cpuid(cpuid_t info, void *buf)
+void cpuid(cpuid_t info, uint32_t *buf)
{
/* Sanity checks, make sure we're not trying to do something
* invalid or we are trying to get information that isn't supported
&& !cpuid_test_feature(info)))
return;
- uint32_t *ubuf = buf;
if (info == CPU_PROC_BRAND_STRING) {
- ___cpuid(CPU_PROC_BRAND_STRING, &ubuf[0], &ubuf[1], &ubuf[2], &ubuf[3]);
- ___cpuid(CPU_PROC_BRAND_STRING_INTERNAL0, &ubuf[4], &ubuf[5], &ubuf[6], &ubuf[7]);
- ___cpuid(CPU_PROC_BRAND_STRING_INTERNAL1, &ubuf[8], &ubuf[9], &ubuf[10], &ubuf[11]);
+ ___cpuid(CPU_PROC_BRAND_STRING, &buf[0], &buf[1], &buf[2], &buf[3]);
+ ___cpuid(CPU_PROC_BRAND_STRING_INTERNAL0, &buf[4], &buf[5], &buf[6], &buf[7]);
+ ___cpuid(CPU_PROC_BRAND_STRING_INTERNAL1, &buf[8], &buf[9], &buf[10], &buf[11]);
return;
} else if (info == CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED) {
- *ubuf = cpuid_highest_ext_func_supported();
+ *buf = cpuid_highest_ext_func_supported();
return;
}
switch (info) {
case CPU_VENDORID:
- ubuf[0] = ebx;
- ubuf[1] = edx;
- ubuf[2] = ecx;
+ buf[0] = ebx;
+ buf[1] = edx;
+ buf[2] = ecx;
break;
case CPU_PROCINFO_AND_FEATUREBITS:
- ubuf[0] = eax; /* The so called "signature" of the CPU. */
- ubuf[1] = edx; /* Feature flags #1. */
- ubuf[2] = ecx; /* Feature flags #2. */
- ubuf[3] = ebx; /* Additional feature information. */
+ buf[0] = eax; /* The so called "signature" of the CPU. */
+ buf[1] = edx; /* Feature flags #1. */
+ buf[2] = ecx; /* Feature flags #2. */
+ buf[3] = ebx; /* Additional feature information. */
break;
case CPU_CACHE_AND_TLBD_INFO:
- ubuf[0] = eax;
- ubuf[1] = ebx;
- ubuf[2] = ecx;
- ubuf[3] = edx;
+ buf[0] = eax;
+ buf[1] = ebx;
+ buf[2] = ecx;
+ buf[3] = edx;
break;
case CPU_EXTENDED_PROC_INFO_FEATURE_BITS:
- ubuf[0] = edx;
- ubuf[1] = ecx;
+ buf[0] = edx;
+ buf[1] = ecx;
break;
case CPU_L1_CACHE_AND_TLB_IDS:
break;
case CPU_EXTENDED_L2_CACHE_FEATURES:
- *ubuf = ecx;
+ *buf = ecx;
break;
case CPU_ADV_POWER_MGT_INFO:
- *ubuf = edx;
+ *buf = edx;
break;
case CPU_VIRT_PHYS_ADDR_SIZES:
- *ubuf = eax;
+ *buf = eax;
break;
default:
- *ubuf = 0xbaadf00d;
+ *buf = 0xbaadf00d;
break;
}
}
-#else
-#warning "Cannot compile this file on a non-x86 machine"
#endif
#ifndef CCAN_CPUID_H
#define CCAN_CPUID_H
+#include <stdbool.h>
+#include <stdint.h>
+
/**
* enum cpuid - stuff to get information on from the CPU.
*
CT_KVM
} cputype_t;
+#if defined(__i386__) || defined(__i386) || defined(__x86_64) \
+ || defined(_M_AMD64) || defined(__M_X64)
+
/**
* cpuid_get_cpu_type - Get CPU Type
*
*
* CPUID is not supported by old CPUS.
*
- * Returns 1 if the cpuid instruction is supported, 0 otherwise.
+ * Returns true if the cpuid instruction is supported, false otherwise.
*
* See also: cpuid()
*/
-int cpuid_is_supported(void);
+bool cpuid_is_supported(void);
/**
* cpuid_highest_ext_func_supported - Get the highest extended function supported
*
* See also: cpuid()
*/
-int cpuid_highest_ext_func_supported(void);
+uint32_t cpuid_highest_ext_func_supported(void);
/**
* cpuid - Get Some information from the CPU.
*
* If an invalid flag has been passed a 0xbaadf00d is returned in *buf.
*/
-void cpuid(cpuid_t info, void *buf);
+void cpuid(cpuid_t info, uint32_t *buf);
/**
* cpuid_test_feature - Test if @feature is available
*
- * Returns 1 if feature is supported, 0 otherwise.
+ * Returns true if feature is supported, false otherwise.
*
* The feature parameter must be >= CPU_EXTENDED_PROC_INFO_FEATURE_BITS
* and <= CPU_VIRT_PHYS_ADDR_SIZES.
*/
-int cpuid_test_feature(cpuid_t feature);
+bool cpuid_test_feature(cpuid_t feature);
/**
* cpuid_has_feature - Test if @feature is supported
*
* Test if the CPU supports MMX/SSE* etc.
* For the extended parameter, usually you want to pass it as
- * 0 if you're not passing CEF_*.
+ * false if you're not passing CEF_*.
*
* For more information about the CPU extended features, have a look
* at:
* http://en.wikipedia.org/wiki/CPUID
*
- * Returns 1 if the feature is available, 0 otherwise.
+ * Returns true if the feature is available, false otherwise.
*/
-#define cpuid_has_mmx() cpuid_has_feature(CF_MMX, 0)
-#define cpuid_has_sse() cpuid_has_feature(CF_SSE, 0)
-#define cpuid_has_sse2() cpuid_has_feature(CF_SSE2, 0)
-#define cpuid_has_sse3() cpuid_has_feature(CF_SSE3, 0)
-#define cpuid_has_ssse3() cpuid_has_feature(CF_SSSE3, 0)
-#define cpuid_has_avx() cpuid_has_feature(CF_AVX, 0)
-#define cpuid_has_fma() cpuid_has_feature(CF_FMA, 0)
-#define cpuid_has_x64() cpuid_has_feature(CEF_x64, 1)
-#define cpuid_has_sse4a() cpuid_has_feature(CEF_SSE4a, 1)
-#define cpuid_has_fma4() cpuid_has_feature(CEF_FMA4, 1)
-#define cpuid_has_xop() cpuid_has_feature(CEF_XOP, 1)
-int cpuid_has_feature(int feature, int extended);
+#define cpuid_has_mmx() cpuid_has_feature(CF_MMX, false)
+#define cpuid_has_sse() cpuid_has_feature(CF_SSE, false)
+#define cpuid_has_sse2() cpuid_has_feature(CF_SSE2, false)
+#define cpuid_has_sse3() cpuid_has_feature(CF_SSE3, false)
+#define cpuid_has_ssse3() cpuid_has_feature(CF_SSSE3, false)
+#define cpuid_has_avx() cpuid_has_feature(CF_AVX, false)
+#define cpuid_has_fma() cpuid_has_feature(CF_FMA, false)
+#define cpuid_has_x64() cpuid_has_feature(CEF_x64, true)
+#define cpuid_has_sse4a() cpuid_has_feature(CEF_SSE4a, true)
+#define cpuid_has_fma4() cpuid_has_feature(CEF_FMA4, true)
+#define cpuid_has_xop() cpuid_has_feature(CEF_XOP, true)
+bool cpuid_has_feature(int feature, bool extended);
+
+#else
+
+#define cpuid_get_cpu_type() BUILD_ASSERT_OR_ZERO(0)
+#define cpuid_get_cpu_type_string() BUILD_ASSERT_OR_ZERO(0)
+#define cpuid_is_supported() BUILD_ASSERT_OR_ZERO(0)
+#define cpuid(info, buf) BUILD_ASSERT_OR_ZERO(0)
+
+#define cpuid_highest_ext_func_supported() BUILD_ASSERT_OR_ZERO(0)
+#define cpuid_test_feature(feature) BUILD_ASSERT_OR_ZERO(0)
+#define cpuid_has_feature(feature, ext) BUILD_ASSERT_OR_ZERO(0)
+
+#endif
#endif
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