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Code Issues Releases Wiki Activity

Remove need for utsname (#136)

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This commit is contained in:
Guillaume Chatelet
2020-10-09 22:40:06 +02:00
committed by GitHub
parent 4795373db2
commit e63405f118
3 changed files with 39 additions and 58 deletions
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86
src/cpuinfo_x86.c
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@ -29,16 +29,18 @@
// microarchitectures.
#if defined(CPU_FEATURES_OS_WINDOWS)
#include <windows.h> // IsProcessorFeaturePresent
#elif defined(HAVE_UTSNAME_H)
#include <sys/utsname.h>
#elif defined(CPU_FEATURES_OS_LINUX_OR_ANDROID)
#include "internal/filesystem.h" // Needed to parse /proc/cpuinfo
#include "internal/stack_line_reader.h" // Needed to parse /proc/cpuinfo
#include "internal/string_view.h" // Needed to parse /proc/cpuinfo
#if defined(HAVE_SYSCTLBYNAME)
#elif defined(CPU_FEATURES_OS_DARWIN)
#if !defined(HAVE_SYSCTLBYNAME)
#error "Darwin needs support for sysctlbyname"
#endif
#include <sys/sysctl.h>
#endif // HAVE_SYSCTLBYNAME
#endif // HAVE_UTSNAME_H
#else
#error "Unsupported OS"
#endif // CPU_FEATURES_OS
////////////////////////////////////////////////////////////////////////////////
// Definitions for CpuId and GetXCR0Eax.
@ -1139,7 +1141,7 @@ static bool GetWindowsIsProcessorFeaturePresent(DWORD ProcessorFeature) {
#endif
#endif // CPU_FEATURES_OS_WINDOWS
#if defined(CPU_FEATURES_OS_DARWIN) && defined(HAVE_SYSCTLBYNAME)
#if defined(CPU_FEATURES_OS_DARWIN)
#if defined(CPU_FEATURES_MOCK_CPUID_X86)
extern bool GetDarwinSysCtlByName(const char*);
#else // CPU_FEATURES_MOCK_CPUID_X86
@ -1150,7 +1152,7 @@ static bool GetDarwinSysCtlByName(const char* name) {
return failure ? false : enabled;
}
#endif
#endif // CPU_FEATURES_OS_DARWIN && HAVE_SYSCTLBYNAME
#endif // CPU_FEATURES_OS_DARWIN
static void DetectSseViaOs(X86Features* features) {
#if defined(CPU_FEATURES_OS_WINDOWS)
@ -1161,50 +1163,40 @@ static void DetectSseViaOs(X86Features* features) {
GetWindowsIsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE);
features->sse3 =
GetWindowsIsProcessorFeaturePresent(PF_SSE3_INSTRUCTIONS_AVAILABLE);
#elif defined(HAVE_UTSNAME_H)
struct utsname buf;
uname(&buf);
#if defined(CPU_FEATURES_OS_DARWIN) && defined(HAVE_SYSCTLBYNAME)
if (CpuFeatures_StringView_IsEquals(str(buf.sysname), str("Darwin"))) {
// Handling Darwin platform through sysctlbyname when available.
features->sse = GetDarwinSysCtlByName("hw.optional.sse");
features->sse2 = GetDarwinSysCtlByName("hw.optional.sse2");
features->sse3 = GetDarwinSysCtlByName("hw.optional.sse3");
features->ssse3 = GetDarwinSysCtlByName("hw.optional.supplementalsse3");
features->sse4_1 = GetDarwinSysCtlByName("hw.optional.sse4_1");
features->sse4_2 = GetDarwinSysCtlByName("hw.optional.sse4_2");
}
#elif defined(CPU_FEATURES_OS_DARWIN)
// Handling Darwin platform through sysctlbyname.
features->sse = GetDarwinSysCtlByName("hw.optional.sse");
features->sse2 = GetDarwinSysCtlByName("hw.optional.sse2");
features->sse3 = GetDarwinSysCtlByName("hw.optional.sse3");
features->ssse3 = GetDarwinSysCtlByName("hw.optional.supplementalsse3");
features->sse4_1 = GetDarwinSysCtlByName("hw.optional.sse4_1");
features->sse4_2 = GetDarwinSysCtlByName("hw.optional.sse4_2");
#elif defined(CPU_FEATURES_OS_LINUX_OR_ANDROID)
if (CpuFeatures_StringView_IsEquals(str(buf.sysname), str("Linux"))) {
// Handling Linux platform through /proc/cpuinfo when available.
const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
if (fd >= 0) {
StackLineReader reader;
StackLineReader_Initialize(&reader, fd);
for (;;) {
const LineResult result = StackLineReader_NextLine(&reader);
const StringView line = result.line;
StringView key, value;
if (CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value)) {
if (CpuFeatures_StringView_IsEquals(key, str("flags"))) {
features->sse = CpuFeatures_StringView_HasWord(value, "sse");
features->sse2 = CpuFeatures_StringView_HasWord(value, "sse2");
features->sse3 = CpuFeatures_StringView_HasWord(value, "sse3");
features->ssse3 = CpuFeatures_StringView_HasWord(value, "ssse3");
features->sse4_1 = CpuFeatures_StringView_HasWord(value, "sse4_1");
features->sse4_2 = CpuFeatures_StringView_HasWord(value, "sse4_2");
break;
}
// Handling Linux platform through /proc/cpuinfo.
const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
if (fd >= 0) {
StackLineReader reader;
StackLineReader_Initialize(&reader, fd);
for (;;) {
const LineResult result = StackLineReader_NextLine(&reader);
const StringView line = result.line;
StringView key, value;
if (CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value)) {
if (CpuFeatures_StringView_IsEquals(key, str("flags"))) {
features->sse = CpuFeatures_StringView_HasWord(value, "sse");
features->sse2 = CpuFeatures_StringView_HasWord(value, "sse2");
features->sse3 = CpuFeatures_StringView_HasWord(value, "sse3");
features->ssse3 = CpuFeatures_StringView_HasWord(value, "ssse3");
features->sse4_1 = CpuFeatures_StringView_HasWord(value, "sse4_1");
features->sse4_2 = CpuFeatures_StringView_HasWord(value, "sse4_2");
break;
}
if (result.eof) break;
}
CpuFeatures_CloseFile(fd);
if (result.eof) break;
}
CpuFeatures_CloseFile(fd);
}
#else // CPU_FEATURES_OS_DARWIN || CPU_FEATURES_OS_LINUX_OR_ANDROID
#error "Unsupported fallback detection of SSE OS support."
#endif
#else // HAVE_UTSNAME_H
#else
#error "Unsupported fallback detection of SSE OS support."
#endif
}