X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fcpuid%2Fcpuid.c;h=a64b1575092ad0daa770cb90c0761ab54f85a32b;hb=39c84ebc38cc5d1180eec154ec1e748d2ddc1682;hp=6f2c5a5306bb9dcd952ade80a176b7b1ed55f46b;hpb=851a0d36a186d457e175116eadf4aa02c5686d02;p=ccan diff --git a/ccan/cpuid/cpuid.c b/ccan/cpuid/cpuid.c index 6f2c5a53..a64b1575 100644 --- a/ccan/cpuid/cpuid.c +++ b/ccan/cpuid/cpuid.c @@ -22,14 +22,17 @@ * This file has been written with some help from wikipedia: * http://en.wikipedia.org/wiki/CPUID */ -#include -#include +/* 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 "cpuid.h" +#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 @@ -58,71 +61,140 @@ static void ___cpuid(cpuid_t info, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, } #endif -int highest_ext_func_supported(void) +bool cpuid_is_supported(void) { - static int highest; + 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. + * + * 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 + * following would be true: + * #if defined(__x86_64) ... + */ - if (!highest) { - asm volatile( - "cpuid\n\t" - : "=a" (highest) - : "a" (CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED) - ); - } +#if UINTPTR_MAX == 0xffffffffffffffff +#define ASM_PUSHF "pushfq\n\t" +#define ASM_POPF "popfq\n\t" +#define ASM_PUSHEAX "pushq %%rax\n\t" +#define ASM_POPEAX "popq %%rax\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 "pushl %%ecx\n\t" +#endif - return highest; + asm volatile( + ASM_PUSHF + ASM_POPEAX + "movl %%eax, %%ecx\n\t" + "xorl $0x200000, %%eax\n\t" + ASM_PUSHEAX + ASM_POPF + ASM_PUSHF + ASM_POPEAX + "xorl %%ecx, %%eax\n\t" + "shrl $21, %%eax\n\t" + "andl $1, %%eax\n\t" + ASM_PUSHECX + ASM_POPF + : "=a" (ret) + ); + +#undef ASM_PUSHF +#undef ASM_POPF +#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; } -int cpuid_test_feature(cpuid_t feature) +bool cpuid_test_feature(cpuid_t feature) { - if (feature > CPU_VIRT_PHYS_ADDR_SIZES || feature < CPU_EXTENDED_PROC_INFO_FEATURE_BITS) - return 0; + if (feature > CPUID_VIRT_PHYS_ADDR_SIZES || feature < CPUID_EXTENDED_PROC_INFO_FEATURE_BITS) + return false; - return (feature <= highest_ext_func_supported()); + return (feature <= cpuid_highest_ext_func_supported()); } -int cpuid_has_feature(cpufeature_t feature) +bool cpuid_has_ecxfeature(int feature) { - uint32_t eax, ebx, ecx, edx; - - ___cpuid(CPU_PROCINFO_AND_FEATUREBITS, &eax, &ebx, &ecx, &edx); - switch (feature) { - case CF_MMX: - case CF_SSE: - case CF_SSE2: - return (edx & ((int)feature)) != 0; - case CF_SSE3: - case CF_SSSE3: - case CF_SSE41: - case CF_SSE42: - case CF_AVX: - case CF_FMA: - return (ecx & ((int)feature)) != 0; + 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 } - return 0; + return (_ecx & feature) == feature; } -int cpuid_has_ext_feature(cpuextfeature_t extfeature) +bool cpuid_has_edxfeature(int feature) { - uint32_t eax, ebx, ecx, edx; - if (!cpuid_test_feature(CPU_EXTENDED_PROC_INFO_FEATURE_BITS)) - return 0; - - ___cpuid(CPU_EXTENDED_PROC_INFO_FEATURE_BITS, &eax, &ebx, &ecx, &edx); - switch (extfeature) { - case CEF_x64: - return (edx & ((int)extfeature)) != 0; - case CEF_SSE4a: - case CEF_FMA4: - case CEF_XOP: - return (ecx & ((int)extfeature)) != 0; + 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 0; + return (_edx & feature) == feature; } -static const char *cpuids[] = { +static const char *const cpuids[] = { "Nooooooooone", "AMDisbetter!", "AuthenticAMD", @@ -141,7 +213,7 @@ static const char *cpuids[] = { "KVMKVMKVMKVM" }; -cputype_t get_cpu_type(void) +cputype_t cpuid_get_cpu_type(void) { static cputype_t cputype; if (cputype == CT_NONE) { @@ -151,9 +223,7 @@ cputype_t 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; @@ -165,28 +235,62 @@ cputype_t get_cpu_type(void) return cputype; } -const char *get_cpu_type_string(const cputype_t cputype) +bool cpuid_sprintf_cputype(const cputype_t cputype, char *buf) +{ + 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) { - return cpuids[(int)cputype]; + static uint32_t highest; + + if (!highest) { +#if defined(__GNUC__) || defined(__clang__) + asm volatile( + "cpuid\n\t" + : "=a" (highest) + : "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; } -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 * 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; - 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]); + 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) { - *ubuf = highest_ext_func_supported(); + } else if (info == CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED) { + *buf = cpuid_highest_ext_func_supported(); return; } @@ -194,41 +298,71 @@ void cpuid(cpuid_t info, void *buf) ___cpuid(info, &eax, &ebx, &ecx, &edx); switch (info) { - case CPU_VENDORID: - ubuf[0] = ebx; - ubuf[1] = edx; - ubuf[2] = ecx; + case CPUID_VENDORID: + 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. */ + 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) & 0xFF; break; - case CPU_CACHE_AND_TLBD_INFO: - ubuf[0] = eax; - ubuf[1] = ebx; - ubuf[2] = ecx; - ubuf[3] = edx; + 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: - ubuf[0] = edx; - ubuf[1] = ecx; + case CPUID_EXTENDED_PROC_INFO_FEATURE_BITS: + buf[0] = edx; + buf[1] = ecx; break; - case CPU_L1_CACHE_AND_TLB_IDS: + 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) & 0xFF; + + buf[4] = ebx & 0xFF; + buf[5] = (ebx >> 8) & 0xFF; + buf[6] = (ebx >> 16) & 0xFF; + buf[7] = (ebx >> 24) & 0xFF; + + buf[8] = ecx & 0xFF; + buf[9] = (ecx >> 8) & 0xFF; + buf[10] = (ecx >> 16) & 0xFF; + buf[11] = (ecx >> 24) & 0xFF; + + buf[12] = edx & 0xFF; + buf[13] = (edx >> 8) & 0xFF; + buf[14] = (edx >> 16) & 0xFF; + buf[15] = (edx >> 24) & 0xFF; break; - case CPU_EXTENDED_L2_CACHE_FEATURES: - *ubuf = 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: - *ubuf = edx; + case CPUID_ADV_POWER_MGT_INFO: + *buf = edx; break; - case CPU_VIRT_PHYS_ADDR_SIZES: - *ubuf = eax; + case CPUID_VIRT_PHYS_ADDR_SIZES: + buf[0] = eax & 0xFF; /* physical. */ + buf[1] = (eax >> 8) & 0xFF; /* virtual. */ break; default: - *ubuf = 0xbaadf00d; + *buf = 0xbaadf00d; break; } } +#endif