X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fcpuid%2Fcpuid.c;h=ad134b5613ef5be80305aab165be0b655a6a6ee2;hp=55a089213797f2e24527b69c46d1315f1fc784ad;hb=5d628b63760d38f7d5094141d019f4ab83546690;hpb=e6f6fe38773914f732d1e0003859a4bd36f26292;ds=sidebyside diff --git a/ccan/cpuid/cpuid.c b/ccan/cpuid/cpuid.c index 55a08921..ad134b56 100644 --- a/ccan/cpuid/cpuid.c +++ b/ccan/cpuid/cpuid.c @@ -31,8 +31,8 @@ #include enum { - CPU_PROC_BRAND_STRING_INTERNAL0 = 0x80000003, - CPU_PROC_BRAND_STRING_INTERNAL1 = 0x80000004 + CPUID_PROC_BRAND_STRING_INTERNAL0 = 0x80000003, + CPUID_PROC_BRAND_STRING_INTERNAL1 = 0x80000004 }; #ifndef _MSC_VER @@ -61,44 +61,21 @@ static void ___cpuid(cpuid_t info, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, } #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; +#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 * operation, but there's no other way to do this unless doing this - * function entirely in assembly. */ - - /* This check is to make sure that the compiler is actually compiling + * function entirely in assembly. + * + * The following assembly code has been shamelessly stolen from: + * http://wiki.osdev.org/CPUID + * and converted to work with AT&T syntax. + * + * This check is to make sure that the compiler is actually compiling * for 64-bit. * * The compiler can be 32-bit and the system 64-bit so the @@ -111,16 +88,15 @@ bool cpuid_is_supported(void) #define ASM_POPF "popfq\n\t" #define ASM_PUSHEAX "pushq %%rax\n\t" #define ASM_POPEAX "popq %%rax\n\t" -#define ASM_PUSHECX "popq %%rcx\n\t" +#define ASM_PUSHECX "pushq %%rcx\n\t" #elif UINTPTR_MAX == 0xffffffff #define ASM_PUSHF "pushfl\n\t" #define ASM_POPF "popfl\n\t" #define ASM_PUSHEAX "pushl %%eax\n\t" #define ASM_POPEAX "popl %%eax\n\t" -#define ASM_PUSHECX "popl %%ecx\n\t" +#define ASM_PUSHECX "pushl %%ecx\n\t" #endif - int ret = 0; asm volatile( ASM_PUSHF ASM_POPEAX @@ -143,36 +119,79 @@ bool cpuid_is_supported(void) #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, 21 + and eax, 1 + push ecx + popfd + + mov eax, ret + }; +#endif return !!ret; } bool cpuid_test_feature(cpuid_t feature) { - if (feature > CPU_VIRT_PHYS_ADDR_SIZES || feature < CPU_EXTENDED_PROC_INFO_FEATURE_BITS) + if (feature > CPUID_VIRT_PHYS_ADDR_SIZES || feature < CPUID_EXTENDED_PROC_INFO_FEATURE_BITS) return false; 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; + static uint32_t _ecx; + if (_ecx == 0) { +#if defined(__GNUC__) || defined(__clang__) + asm volatile( + "cpuid\n\t" + : "=c" (_ecx) + : "a" (CPUID_PROCINFO_AND_FEATUREBITS) + ); +#elif defined _MSC_VER + __asm { + mov eax, CPUID_PROCINFO_AND_FEATUREBITS + cpuid + mov _ecx, ecx + }; +#endif + } - 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); - } + 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" (CPUID_PROCINFO_AND_FEATUREBITS) + ); +#elif defined _MSC_VER + __asm { + mov eax, CPUID_PROCINFO_AND_FEATUREBITS + cpuid + mov _edx, edx + }; +#endif } - return false; + + return (_edx & feature) == feature; } static const char *const cpuids[] = { @@ -204,9 +223,7 @@ cputype_t cpuid_get_cpu_type(void) } u; uint32_t i; - ___cpuid(CPU_VENDORID, &i, &u.bufu32[0], &u.bufu32[2], &u.bufu32[1]); - u.buf[12] = '\0'; - + ___cpuid(CPUID_VENDORID, &i, &u.bufu32[0], &u.bufu32[2], &u.bufu32[1]); for (i = 0; i < sizeof(cpuids) / sizeof(cpuids[0]); ++i) { if (strncmp(cpuids[i], u.buf, 12) == 0) { cputype = (cputype_t)i; @@ -218,9 +235,14 @@ cputype_t cpuid_get_cpu_type(void) return cputype; } -const char *cpuid_get_cpu_type_string(const cputype_t cputype) +bool cpuid_sprintf_cputype(const cputype_t cputype, char *buf) { - return cpuids[(int)cputype]; + if (cputype == CT_NONE) + return false; + + memcpy(buf, cpuids[(int)cputype], 12); + buf[12] = '\0'; + return true; } uint32_t cpuid_highest_ext_func_supported(void) @@ -228,11 +250,19 @@ uint32_t cpuid_highest_ext_func_supported(void) static uint32_t highest; if (!highest) { +#if defined(__GNUC__) || defined(__clang__) asm volatile( "cpuid\n\t" : "=a" (highest) - : "a" (CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED) + : "a" (CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED) ); +#elif defined _MSC_VER + __asm { + mov eax, CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED + cpuid + mov highest, eax + }; +#endif } return highest; @@ -243,16 +273,23 @@ 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 * by the CPU. */ - if (info > CPU_VIRT_PHYS_ADDR_SIZES || (info > CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED + if (info > CPUID_VIRT_PHYS_ADDR_SIZES || (info > CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED && !cpuid_test_feature(info))) return; - if (info == CPU_PROC_BRAND_STRING) { - ___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]); + if (info == CPUID_PROC_BRAND_STRING) { + static char cached[48] = { 0 }; + if (cached[0] == '\0') { + ___cpuid(CPUID_PROC_BRAND_STRING, &buf[0], &buf[1], &buf[2], &buf[3]); + ___cpuid(CPUID_PROC_BRAND_STRING_INTERNAL0, &buf[4], &buf[5], &buf[6], &buf[7]); + ___cpuid(CPUID_PROC_BRAND_STRING_INTERNAL1, &buf[8], &buf[9], &buf[10], &buf[11]); + + memcpy(cached, buf, sizeof cached); + } else + buf = (uint32_t *)cached; + return; - } else if (info == CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED) { + } else if (info == CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED) { *buf = cpuid_highest_ext_func_supported(); return; } @@ -261,41 +298,66 @@ void cpuid(cpuid_t info, uint32_t *buf) ___cpuid(info, &eax, &ebx, &ecx, &edx); switch (info) { - case CPU_VENDORID: + case CPUID_VENDORID: buf[0] = ebx; buf[1] = edx; buf[2] = ecx; break; - case CPU_PROCINFO_AND_FEATUREBITS: - 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. */ + case CPUID_PROCINFO_AND_FEATUREBITS: + buf[0] = (eax & 0x0F); /* Stepping */ + buf[1] = (eax >> 4) & 0x0F; /* Model */ + buf[2] = (eax >> 8) & 0x0F; /* Family */ + buf[3] = (eax >> 16) & 0x0F; /* Extended Model. */ + buf[4] = (eax >> 24) & 0x0F; /* Extended Family. */ + + /* Additional Feature information. */ + buf[5] = ebx & 0xFF; + buf[6] = (ebx >> 8) & 0xFF; + buf[7] = (ebx >> 16) & 0xFF; + buf[8] = ebx >> 24; break; - case CPU_CACHE_AND_TLBD_INFO: + case CPUID_CACHE_AND_TLBD_INFO: buf[0] = eax; buf[1] = ebx; buf[2] = ecx; buf[3] = edx; break; - case CPU_EXTENDED_PROC_INFO_FEATURE_BITS: + case CPUID_EXTENDED_PROC_INFO_FEATURE_BITS: buf[0] = edx; buf[1] = ecx; break; - case CPU_L1_CACHE_AND_TLB_IDS: - buf[0] = eax; - buf[1] = ebx; - buf[2] = ecx; - buf[3] = edx; + case CPUID_L1_CACHE_AND_TLB_IDS: + buf[0] = eax & 0xFF; + buf[1] = (eax >> 8) & 0xFF; + buf[2] = (eax >> 16) & 0xFF; + buf[3] = eax >> 24; + + buf[4] = ebx & 0xFF; + buf[5] = (ebx >> 8) & 0xFF; + buf[6] = (ebx >> 16) & 0xFF; + buf[7] = ebx >> 24; + + buf[8] = ecx & 0xFF; + buf[9] = (ecx >> 8) & 0xFF; + buf[10] = (ecx >> 16) & 0xFF; + buf[11] = ecx >> 24; + + buf[12] = edx & 0xFF; + buf[13] = (edx >> 8) & 0xFF; + buf[14] = (edx >> 16) & 0xFF; + buf[15] = edx >> 24; break; - case CPU_EXTENDED_L2_CACHE_FEATURES: - *buf = ecx; + case CPUID_EXTENDED_L2_CACHE_FEATURES: + buf[0] = ecx & 0xFF; /* Line size. */ + buf[1] = (ecx >> 12) & 0xFF; /* Associativity. */ + buf[2] = ecx >> 16; /* Cache size. */ break; - case CPU_ADV_POWER_MGT_INFO: + case CPUID_ADV_POWER_MGT_INFO: *buf = edx; break; - case CPU_VIRT_PHYS_ADDR_SIZES: - *buf = eax; + case CPUID_VIRT_PHYS_ADDR_SIZES: + buf[0] = eax & 0xFF; /* physical. */ + buf[1] = (eax >> 8) & 0xFF; /* virtual. */ break; default: *buf = 0xbaadf00d; @@ -304,4 +366,3 @@ void cpuid(cpuid_t info, uint32_t *buf) } #endif -