diff options
Diffstat (limited to 'util/compress/libdeflate/lib/x86/cpu_features.c')
| -rw-r--r-- | util/compress/libdeflate/lib/x86/cpu_features.c | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/util/compress/libdeflate/lib/x86/cpu_features.c b/util/compress/libdeflate/lib/x86/cpu_features.c deleted file mode 100644 index e3471d468..000000000 --- a/util/compress/libdeflate/lib/x86/cpu_features.c +++ /dev/null @@ -1,152 +0,0 @@ -/* - * x86/cpu_features.c - feature detection for x86 processors - * - * Copyright 2016 Eric Biggers - * - * Permission is hereby granted, free of charge, to any person - * obtaining a copy of this software and associated documentation - * files (the "Software"), to deal in the Software without - * restriction, including without limitation the rights to use, - * copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the - * Software is furnished to do so, subject to the following - * conditions: - * - * The above copyright notice and this permission notice shall be - * included in all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES - * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT - * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, - * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING - * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR - * OTHER DEALINGS IN THE SOFTWARE. - */ - -#include "../cpu_features_common.h" /* must be included first */ -#include "cpu_features.h" - -#if X86_CPU_FEATURES_ENABLED - -volatile u32 _cpu_features = 0; - -/* With old GCC versions we have to manually save and restore the x86_32 PIC - * register (ebx). See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47602 */ -#if defined(__i386__) && defined(__PIC__) -# define EBX_CONSTRAINT "=&r" -#else -# define EBX_CONSTRAINT "=b" -#endif - -/* Execute the CPUID instruction. */ -static inline void -cpuid(u32 leaf, u32 subleaf, u32 *a, u32 *b, u32 *c, u32 *d) -{ - __asm__(".ifnc %%ebx, %1; mov %%ebx, %1; .endif\n" - "cpuid \n" - ".ifnc %%ebx, %1; xchg %%ebx, %1; .endif\n" - : "=a" (*a), EBX_CONSTRAINT (*b), "=c" (*c), "=d" (*d) - : "a" (leaf), "c" (subleaf)); -} - -/* Read an extended control register. */ -static inline u64 -read_xcr(u32 index) -{ - u32 edx, eax; - - /* Execute the "xgetbv" instruction. Old versions of binutils do not - * recognize this instruction, so list the raw bytes instead. */ - __asm__ (".byte 0x0f, 0x01, 0xd0" : "=d" (edx), "=a" (eax) : "c" (index)); - - return ((u64)edx << 32) | eax; -} - -#undef BIT -#define BIT(nr) (1UL << (nr)) - -#define XCR0_BIT_SSE BIT(1) -#define XCR0_BIT_AVX BIT(2) -#define XCR0_BIT_OPMASK BIT(5) -#define XCR0_BIT_ZMM_HI256 BIT(6) -#define XCR0_BIT_HI16_ZMM BIT(7) - -#define IS_SET(reg, nr) ((reg) & BIT(nr)) -#define IS_ALL_SET(reg, mask) (((reg) & (mask)) == (mask)) - -static const struct cpu_feature x86_cpu_feature_table[] = { - {X86_CPU_FEATURE_SSE2, "sse2"}, - {X86_CPU_FEATURE_PCLMUL, "pclmul"}, - {X86_CPU_FEATURE_AVX, "avx"}, - {X86_CPU_FEATURE_AVX2, "avx2"}, - {X86_CPU_FEATURE_BMI2, "bmi2"}, - {X86_CPU_FEATURE_AVX512BW, "avx512bw"}, -}; - -/* Initialize _cpu_features with bits for interesting processor features. */ -void setup_cpu_features(void) -{ - u32 features = 0; - u32 dummy1, dummy2, dummy3, dummy4; - u32 max_function; - u32 features_1, features_2, features_3, features_4; - bool os_avx_support = false; - bool os_avx512_support = false; - - /* Get maximum supported function */ - cpuid(0, 0, &max_function, &dummy2, &dummy3, &dummy4); - if (max_function < 1) - goto out; - - /* Standard feature flags */ - cpuid(1, 0, &dummy1, &dummy2, &features_2, &features_1); - - if (IS_SET(features_1, 26)) - features |= X86_CPU_FEATURE_SSE2; - - if (IS_SET(features_2, 1)) - features |= X86_CPU_FEATURE_PCLMUL; - - if (IS_SET(features_2, 27)) { /* OSXSAVE set? */ - u64 xcr0 = read_xcr(0); - - os_avx_support = IS_ALL_SET(xcr0, - XCR0_BIT_SSE | - XCR0_BIT_AVX); - - os_avx512_support = IS_ALL_SET(xcr0, - XCR0_BIT_SSE | - XCR0_BIT_AVX | - XCR0_BIT_OPMASK | - XCR0_BIT_ZMM_HI256 | - XCR0_BIT_HI16_ZMM); - } - - if (os_avx_support && IS_SET(features_2, 28)) - features |= X86_CPU_FEATURE_AVX; - - if (max_function < 7) - goto out; - - /* Extended feature flags */ - cpuid(7, 0, &dummy1, &features_3, &features_4, &dummy4); - - if (os_avx_support && IS_SET(features_3, 5)) - features |= X86_CPU_FEATURE_AVX2; - - if (IS_SET(features_3, 8)) - features |= X86_CPU_FEATURE_BMI2; - - if (os_avx512_support && IS_SET(features_3, 30)) - features |= X86_CPU_FEATURE_AVX512BW; - -out: - disable_cpu_features_for_testing(&features, x86_cpu_feature_table, - ARRAY_LEN(x86_cpu_feature_table)); - - _cpu_features = features | X86_CPU_FEATURES_KNOWN; -} - -#endif /* X86_CPU_FEATURES_ENABLED */ |