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https://sourceware.org/git/glibc.git
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f3a99b2216
Don't set Prefer_No_AVX512 on processors with AVX512 and AVX-VNNI since
they won't lower CPU frequency when ZMM load and store instructions are
used.
(cherry picked from commit ceeffe968c)
875 lines
28 KiB
C
875 lines
28 KiB
C
/* Initialize CPU feature data.
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This file is part of the GNU C Library.
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Copyright (C) 2008-2021 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <dl-hwcap.h>
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#include <libc-pointer-arith.h>
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#include <get-isa-level.h>
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#include <cacheinfo.h>
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#include <dl-cacheinfo.h>
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#include <dl-minsigstacksize.h>
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#if HAVE_TUNABLES
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extern void TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *)
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attribute_hidden;
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# if CET_ENABLED
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extern void TUNABLE_CALLBACK (set_x86_ibt) (tunable_val_t *)
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attribute_hidden;
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extern void TUNABLE_CALLBACK (set_x86_shstk) (tunable_val_t *)
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attribute_hidden;
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# endif
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#endif
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#if CET_ENABLED
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# include <dl-cet.h>
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#endif
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static void
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update_active (struct cpu_features *cpu_features)
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{
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/* Copy the cpuid bits to active bits for CPU featuress whose usability
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in user space can be detected without additonal OS support. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, SSE3);
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CPU_FEATURE_SET_ACTIVE (cpu_features, PCLMULQDQ);
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CPU_FEATURE_SET_ACTIVE (cpu_features, SSSE3);
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CPU_FEATURE_SET_ACTIVE (cpu_features, CMPXCHG16B);
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CPU_FEATURE_SET_ACTIVE (cpu_features, SSE4_1);
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CPU_FEATURE_SET_ACTIVE (cpu_features, SSE4_2);
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CPU_FEATURE_SET_ACTIVE (cpu_features, MOVBE);
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CPU_FEATURE_SET_ACTIVE (cpu_features, POPCNT);
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CPU_FEATURE_SET_ACTIVE (cpu_features, AES);
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CPU_FEATURE_SET_ACTIVE (cpu_features, OSXSAVE);
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CPU_FEATURE_SET_ACTIVE (cpu_features, TSC);
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CPU_FEATURE_SET_ACTIVE (cpu_features, CX8);
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CPU_FEATURE_SET_ACTIVE (cpu_features, CMOV);
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CPU_FEATURE_SET_ACTIVE (cpu_features, CLFSH);
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CPU_FEATURE_SET_ACTIVE (cpu_features, MMX);
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CPU_FEATURE_SET_ACTIVE (cpu_features, FXSR);
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CPU_FEATURE_SET_ACTIVE (cpu_features, SSE);
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CPU_FEATURE_SET_ACTIVE (cpu_features, SSE2);
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CPU_FEATURE_SET_ACTIVE (cpu_features, HTT);
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CPU_FEATURE_SET_ACTIVE (cpu_features, BMI1);
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CPU_FEATURE_SET_ACTIVE (cpu_features, HLE);
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CPU_FEATURE_SET_ACTIVE (cpu_features, BMI2);
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CPU_FEATURE_SET_ACTIVE (cpu_features, ERMS);
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CPU_FEATURE_SET_ACTIVE (cpu_features, RDSEED);
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CPU_FEATURE_SET_ACTIVE (cpu_features, ADX);
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CPU_FEATURE_SET_ACTIVE (cpu_features, CLFLUSHOPT);
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CPU_FEATURE_SET_ACTIVE (cpu_features, CLWB);
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CPU_FEATURE_SET_ACTIVE (cpu_features, SHA);
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CPU_FEATURE_SET_ACTIVE (cpu_features, PREFETCHWT1);
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CPU_FEATURE_SET_ACTIVE (cpu_features, OSPKE);
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CPU_FEATURE_SET_ACTIVE (cpu_features, WAITPKG);
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CPU_FEATURE_SET_ACTIVE (cpu_features, GFNI);
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CPU_FEATURE_SET_ACTIVE (cpu_features, RDPID);
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CPU_FEATURE_SET_ACTIVE (cpu_features, RDRAND);
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CPU_FEATURE_SET_ACTIVE (cpu_features, CLDEMOTE);
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CPU_FEATURE_SET_ACTIVE (cpu_features, MOVDIRI);
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CPU_FEATURE_SET_ACTIVE (cpu_features, MOVDIR64B);
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CPU_FEATURE_SET_ACTIVE (cpu_features, FSRM);
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CPU_FEATURE_SET_ACTIVE (cpu_features, RTM_ALWAYS_ABORT);
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CPU_FEATURE_SET_ACTIVE (cpu_features, SERIALIZE);
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CPU_FEATURE_SET_ACTIVE (cpu_features, TSXLDTRK);
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CPU_FEATURE_SET_ACTIVE (cpu_features, LAHF64_SAHF64);
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CPU_FEATURE_SET_ACTIVE (cpu_features, LZCNT);
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CPU_FEATURE_SET_ACTIVE (cpu_features, SSE4A);
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CPU_FEATURE_SET_ACTIVE (cpu_features, PREFETCHW);
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CPU_FEATURE_SET_ACTIVE (cpu_features, TBM);
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CPU_FEATURE_SET_ACTIVE (cpu_features, RDTSCP);
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CPU_FEATURE_SET_ACTIVE (cpu_features, WBNOINVD);
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CPU_FEATURE_SET_ACTIVE (cpu_features, FZLRM);
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CPU_FEATURE_SET_ACTIVE (cpu_features, FSRS);
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CPU_FEATURE_SET_ACTIVE (cpu_features, FSRCS);
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CPU_FEATURE_SET_ACTIVE (cpu_features, PTWRITE);
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if (!CPU_FEATURES_CPU_P (cpu_features, RTM_ALWAYS_ABORT))
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CPU_FEATURE_SET_ACTIVE (cpu_features, RTM);
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#if CET_ENABLED
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CPU_FEATURE_SET_ACTIVE (cpu_features, IBT);
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CPU_FEATURE_SET_ACTIVE (cpu_features, SHSTK);
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#endif
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/* Can we call xgetbv? */
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if (CPU_FEATURES_CPU_P (cpu_features, OSXSAVE))
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{
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unsigned int xcrlow;
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unsigned int xcrhigh;
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asm ("xgetbv" : "=a" (xcrlow), "=d" (xcrhigh) : "c" (0));
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/* Is YMM and XMM state usable? */
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if ((xcrlow & (bit_YMM_state | bit_XMM_state))
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== (bit_YMM_state | bit_XMM_state))
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{
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/* Determine if AVX is usable. */
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if (CPU_FEATURES_CPU_P (cpu_features, AVX))
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{
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CPU_FEATURE_SET (cpu_features, AVX);
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/* The following features depend on AVX being usable. */
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/* Determine if AVX2 is usable. */
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if (CPU_FEATURES_CPU_P (cpu_features, AVX2))
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{
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CPU_FEATURE_SET (cpu_features, AVX2);
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/* Unaligned load with 256-bit AVX registers are faster
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on Intel/AMD processors with AVX2. */
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cpu_features->preferred[index_arch_AVX_Fast_Unaligned_Load]
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|= bit_arch_AVX_Fast_Unaligned_Load;
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}
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/* Determine if AVX-VNNI is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX_VNNI);
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/* Determine if FMA is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, FMA);
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/* Determine if VAES is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, VAES);
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/* Determine if VPCLMULQDQ is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, VPCLMULQDQ);
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/* Determine if XOP is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, XOP);
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/* Determine if F16C is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, F16C);
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}
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/* Check if OPMASK state, upper 256-bit of ZMM0-ZMM15 and
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ZMM16-ZMM31 state are enabled. */
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if ((xcrlow & (bit_Opmask_state | bit_ZMM0_15_state
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| bit_ZMM16_31_state))
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== (bit_Opmask_state | bit_ZMM0_15_state | bit_ZMM16_31_state))
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{
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/* Determine if AVX512F is usable. */
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if (CPU_FEATURES_CPU_P (cpu_features, AVX512F))
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{
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CPU_FEATURE_SET (cpu_features, AVX512F);
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/* Determine if AVX512CD is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512CD);
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/* Determine if AVX512ER is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512ER);
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/* Determine if AVX512PF is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512PF);
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/* Determine if AVX512VL is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512VL);
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/* Determine if AVX512DQ is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512DQ);
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/* Determine if AVX512BW is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512BW);
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/* Determine if AVX512_4FMAPS is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512_4FMAPS);
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/* Determine if AVX512_4VNNIW is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512_4VNNIW);
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/* Determine if AVX512_BITALG is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512_BITALG);
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/* Determine if AVX512_IFMA is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512_IFMA);
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/* Determine if AVX512_VBMI is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512_VBMI);
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/* Determine if AVX512_VBMI2 is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512_VBMI2);
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/* Determine if is AVX512_VNNI usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512_VNNI);
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/* Determine if AVX512_VPOPCNTDQ is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features,
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AVX512_VPOPCNTDQ);
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/* Determine if AVX512_VP2INTERSECT is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features,
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AVX512_VP2INTERSECT);
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/* Determine if AVX512_BF16 is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512_BF16);
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/* Determine if AVX512_FP16 is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AVX512_FP16);
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}
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}
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}
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/* Are XTILECFG and XTILEDATA states usable? */
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if ((xcrlow & (bit_XTILECFG_state | bit_XTILEDATA_state))
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== (bit_XTILECFG_state | bit_XTILEDATA_state))
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{
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/* Determine if AMX_BF16 is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AMX_BF16);
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/* Determine if AMX_TILE is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AMX_TILE);
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/* Determine if AMX_INT8 is usable. */
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CPU_FEATURE_SET_ACTIVE (cpu_features, AMX_INT8);
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}
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/* These features are usable only when OSXSAVE is enabled. */
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CPU_FEATURE_SET (cpu_features, XSAVE);
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CPU_FEATURE_SET_ACTIVE (cpu_features, XSAVEOPT);
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CPU_FEATURE_SET_ACTIVE (cpu_features, XSAVEC);
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CPU_FEATURE_SET_ACTIVE (cpu_features, XGETBV_ECX_1);
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CPU_FEATURE_SET_ACTIVE (cpu_features, XFD);
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/* For _dl_runtime_resolve, set xsave_state_size to xsave area
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size + integer register save size and align it to 64 bytes. */
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if (cpu_features->basic.max_cpuid >= 0xd)
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{
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unsigned int eax, ebx, ecx, edx;
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__cpuid_count (0xd, 0, eax, ebx, ecx, edx);
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if (ebx != 0)
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{
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unsigned int xsave_state_full_size
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= ALIGN_UP (ebx + STATE_SAVE_OFFSET, 64);
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cpu_features->xsave_state_size
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= xsave_state_full_size;
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cpu_features->xsave_state_full_size
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= xsave_state_full_size;
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/* Check if XSAVEC is available. */
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if (CPU_FEATURES_CPU_P (cpu_features, XSAVEC))
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{
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unsigned int xstate_comp_offsets[32];
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unsigned int xstate_comp_sizes[32];
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unsigned int i;
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xstate_comp_offsets[0] = 0;
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xstate_comp_offsets[1] = 160;
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xstate_comp_offsets[2] = 576;
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xstate_comp_sizes[0] = 160;
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xstate_comp_sizes[1] = 256;
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for (i = 2; i < 32; i++)
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{
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if ((STATE_SAVE_MASK & (1 << i)) != 0)
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{
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__cpuid_count (0xd, i, eax, ebx, ecx, edx);
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xstate_comp_sizes[i] = eax;
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}
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else
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{
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ecx = 0;
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xstate_comp_sizes[i] = 0;
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}
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if (i > 2)
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{
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xstate_comp_offsets[i]
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= (xstate_comp_offsets[i - 1]
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+ xstate_comp_sizes[i -1]);
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if ((ecx & (1 << 1)) != 0)
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xstate_comp_offsets[i]
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= ALIGN_UP (xstate_comp_offsets[i], 64);
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}
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}
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/* Use XSAVEC. */
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unsigned int size
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= xstate_comp_offsets[31] + xstate_comp_sizes[31];
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if (size)
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{
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cpu_features->xsave_state_size
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= ALIGN_UP (size + STATE_SAVE_OFFSET, 64);
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CPU_FEATURE_SET (cpu_features, XSAVEC);
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}
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}
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}
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}
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}
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/* Determine if PKU is usable. */
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if (CPU_FEATURES_CPU_P (cpu_features, OSPKE))
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CPU_FEATURE_SET (cpu_features, PKU);
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/* Determine if Key Locker instructions are usable. */
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if (CPU_FEATURES_CPU_P (cpu_features, AESKLE))
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{
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CPU_FEATURE_SET (cpu_features, AESKLE);
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CPU_FEATURE_SET_ACTIVE (cpu_features, KL);
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CPU_FEATURE_SET_ACTIVE (cpu_features, WIDE_KL);
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}
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cpu_features->isa_1 = get_isa_level (cpu_features);
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}
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static void
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get_extended_indices (struct cpu_features *cpu_features)
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{
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unsigned int eax, ebx, ecx, edx;
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__cpuid (0x80000000, eax, ebx, ecx, edx);
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if (eax >= 0x80000001)
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__cpuid (0x80000001,
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cpu_features->features[CPUID_INDEX_80000001].cpuid.eax,
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cpu_features->features[CPUID_INDEX_80000001].cpuid.ebx,
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cpu_features->features[CPUID_INDEX_80000001].cpuid.ecx,
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cpu_features->features[CPUID_INDEX_80000001].cpuid.edx);
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if (eax >= 0x80000007)
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__cpuid (0x80000007,
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cpu_features->features[CPUID_INDEX_80000007].cpuid.eax,
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cpu_features->features[CPUID_INDEX_80000007].cpuid.ebx,
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cpu_features->features[CPUID_INDEX_80000007].cpuid.ecx,
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cpu_features->features[CPUID_INDEX_80000007].cpuid.edx);
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if (eax >= 0x80000008)
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__cpuid (0x80000008,
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cpu_features->features[CPUID_INDEX_80000008].cpuid.eax,
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cpu_features->features[CPUID_INDEX_80000008].cpuid.ebx,
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cpu_features->features[CPUID_INDEX_80000008].cpuid.ecx,
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cpu_features->features[CPUID_INDEX_80000008].cpuid.edx);
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}
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static void
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get_common_indices (struct cpu_features *cpu_features,
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unsigned int *family, unsigned int *model,
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unsigned int *extended_model, unsigned int *stepping)
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{
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if (family)
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{
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unsigned int eax;
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__cpuid (1, eax,
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cpu_features->features[CPUID_INDEX_1].cpuid.ebx,
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cpu_features->features[CPUID_INDEX_1].cpuid.ecx,
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cpu_features->features[CPUID_INDEX_1].cpuid.edx);
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cpu_features->features[CPUID_INDEX_1].cpuid.eax = eax;
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*family = (eax >> 8) & 0x0f;
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*model = (eax >> 4) & 0x0f;
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*extended_model = (eax >> 12) & 0xf0;
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*stepping = eax & 0x0f;
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if (*family == 0x0f)
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{
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*family += (eax >> 20) & 0xff;
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*model += *extended_model;
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}
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}
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if (cpu_features->basic.max_cpuid >= 7)
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{
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__cpuid_count (7, 0,
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cpu_features->features[CPUID_INDEX_7].cpuid.eax,
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cpu_features->features[CPUID_INDEX_7].cpuid.ebx,
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cpu_features->features[CPUID_INDEX_7].cpuid.ecx,
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cpu_features->features[CPUID_INDEX_7].cpuid.edx);
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__cpuid_count (7, 1,
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cpu_features->features[CPUID_INDEX_7_ECX_1].cpuid.eax,
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cpu_features->features[CPUID_INDEX_7_ECX_1].cpuid.ebx,
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cpu_features->features[CPUID_INDEX_7_ECX_1].cpuid.ecx,
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cpu_features->features[CPUID_INDEX_7_ECX_1].cpuid.edx);
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}
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if (cpu_features->basic.max_cpuid >= 0xd)
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__cpuid_count (0xd, 1,
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cpu_features->features[CPUID_INDEX_D_ECX_1].cpuid.eax,
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cpu_features->features[CPUID_INDEX_D_ECX_1].cpuid.ebx,
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cpu_features->features[CPUID_INDEX_D_ECX_1].cpuid.ecx,
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cpu_features->features[CPUID_INDEX_D_ECX_1].cpuid.edx);
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if (cpu_features->basic.max_cpuid >= 0x14)
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__cpuid_count (0x14, 0,
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cpu_features->features[CPUID_INDEX_14_ECX_0].cpuid.eax,
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cpu_features->features[CPUID_INDEX_14_ECX_0].cpuid.ebx,
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cpu_features->features[CPUID_INDEX_14_ECX_0].cpuid.ecx,
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cpu_features->features[CPUID_INDEX_14_ECX_0].cpuid.edx);
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if (cpu_features->basic.max_cpuid >= 0x19)
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__cpuid_count (0x19, 0,
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cpu_features->features[CPUID_INDEX_19].cpuid.eax,
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cpu_features->features[CPUID_INDEX_19].cpuid.ebx,
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cpu_features->features[CPUID_INDEX_19].cpuid.ecx,
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cpu_features->features[CPUID_INDEX_19].cpuid.edx);
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dl_check_minsigstacksize (cpu_features);
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}
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_Static_assert (((index_arch_Fast_Unaligned_Load
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== index_arch_Fast_Unaligned_Copy)
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&& (index_arch_Fast_Unaligned_Load
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== index_arch_Prefer_PMINUB_for_stringop)
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&& (index_arch_Fast_Unaligned_Load
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== index_arch_Slow_SSE4_2)
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&& (index_arch_Fast_Unaligned_Load
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== index_arch_Fast_Rep_String)
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&& (index_arch_Fast_Unaligned_Load
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== index_arch_Fast_Copy_Backward)),
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"Incorrect index_arch_Fast_Unaligned_Load");
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static inline void
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init_cpu_features (struct cpu_features *cpu_features)
|
|
{
|
|
unsigned int ebx, ecx, edx;
|
|
unsigned int family = 0;
|
|
unsigned int model = 0;
|
|
unsigned int stepping = 0;
|
|
enum cpu_features_kind kind;
|
|
|
|
#if !HAS_CPUID
|
|
if (__get_cpuid_max (0, 0) == 0)
|
|
{
|
|
kind = arch_kind_other;
|
|
goto no_cpuid;
|
|
}
|
|
#endif
|
|
|
|
__cpuid (0, cpu_features->basic.max_cpuid, ebx, ecx, edx);
|
|
|
|
/* This spells out "GenuineIntel". */
|
|
if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69)
|
|
{
|
|
unsigned int extended_model;
|
|
|
|
kind = arch_kind_intel;
|
|
|
|
get_common_indices (cpu_features, &family, &model, &extended_model,
|
|
&stepping);
|
|
|
|
get_extended_indices (cpu_features);
|
|
|
|
update_active (cpu_features);
|
|
|
|
if (family == 0x06)
|
|
{
|
|
model += extended_model;
|
|
switch (model)
|
|
{
|
|
case 0x1c:
|
|
case 0x26:
|
|
/* BSF is slow on Atom. */
|
|
cpu_features->preferred[index_arch_Slow_BSF]
|
|
|= bit_arch_Slow_BSF;
|
|
break;
|
|
|
|
case 0x57:
|
|
/* Knights Landing. Enable Silvermont optimizations. */
|
|
|
|
case 0x7a:
|
|
/* Unaligned load versions are faster than SSSE3
|
|
on Goldmont Plus. */
|
|
|
|
case 0x5c:
|
|
case 0x5f:
|
|
/* Unaligned load versions are faster than SSSE3
|
|
on Goldmont. */
|
|
|
|
case 0x4c:
|
|
case 0x5a:
|
|
case 0x75:
|
|
/* Airmont is a die shrink of Silvermont. */
|
|
|
|
case 0x37:
|
|
case 0x4a:
|
|
case 0x4d:
|
|
case 0x5d:
|
|
/* Unaligned load versions are faster than SSSE3
|
|
on Silvermont. */
|
|
cpu_features->preferred[index_arch_Fast_Unaligned_Load]
|
|
|= (bit_arch_Fast_Unaligned_Load
|
|
| bit_arch_Fast_Unaligned_Copy
|
|
| bit_arch_Prefer_PMINUB_for_stringop
|
|
| bit_arch_Slow_SSE4_2);
|
|
break;
|
|
|
|
case 0x86:
|
|
case 0x96:
|
|
case 0x9c:
|
|
/* Enable rep string instructions, unaligned load, unaligned
|
|
copy, pminub and avoid SSE 4.2 on Tremont. */
|
|
cpu_features->preferred[index_arch_Fast_Rep_String]
|
|
|= (bit_arch_Fast_Rep_String
|
|
| bit_arch_Fast_Unaligned_Load
|
|
| bit_arch_Fast_Unaligned_Copy
|
|
| bit_arch_Prefer_PMINUB_for_stringop
|
|
| bit_arch_Slow_SSE4_2);
|
|
break;
|
|
|
|
default:
|
|
/* Unknown family 0x06 processors. Assuming this is one
|
|
of Core i3/i5/i7 processors if AVX is available. */
|
|
if (!CPU_FEATURES_CPU_P (cpu_features, AVX))
|
|
break;
|
|
/* Fall through. */
|
|
|
|
case 0x1a:
|
|
case 0x1e:
|
|
case 0x1f:
|
|
case 0x25:
|
|
case 0x2c:
|
|
case 0x2e:
|
|
case 0x2f:
|
|
/* Rep string instructions, unaligned load, unaligned copy,
|
|
and pminub are fast on Intel Core i3, i5 and i7. */
|
|
cpu_features->preferred[index_arch_Fast_Rep_String]
|
|
|= (bit_arch_Fast_Rep_String
|
|
| bit_arch_Fast_Unaligned_Load
|
|
| bit_arch_Fast_Unaligned_Copy
|
|
| bit_arch_Prefer_PMINUB_for_stringop);
|
|
break;
|
|
}
|
|
|
|
/* Disable TSX on some processors to avoid TSX on kernels that
|
|
weren't updated with the latest microcode package (which
|
|
disables broken feature by default). */
|
|
switch (model)
|
|
{
|
|
case 0x55:
|
|
if (stepping <= 5)
|
|
goto disable_tsx;
|
|
break;
|
|
case 0x8e:
|
|
/* NB: Although the errata documents that for model == 0x8e,
|
|
only 0xb stepping or lower are impacted, the intention of
|
|
the errata was to disable TSX on all client processors on
|
|
all steppings. Include 0xc stepping which is an Intel
|
|
Core i7-8665U, a client mobile processor. */
|
|
case 0x9e:
|
|
if (stepping > 0xc)
|
|
break;
|
|
/* Fall through. */
|
|
case 0x4e:
|
|
case 0x5e:
|
|
{
|
|
/* Disable Intel TSX and enable RTM_ALWAYS_ABORT for
|
|
processors listed in:
|
|
|
|
https://www.intel.com/content/www/us/en/support/articles/000059422/processors.html
|
|
*/
|
|
disable_tsx:
|
|
CPU_FEATURE_UNSET (cpu_features, HLE);
|
|
CPU_FEATURE_UNSET (cpu_features, RTM);
|
|
CPU_FEATURE_SET (cpu_features, RTM_ALWAYS_ABORT);
|
|
}
|
|
break;
|
|
case 0x3f:
|
|
/* Xeon E7 v3 with stepping >= 4 has working TSX. */
|
|
if (stepping >= 4)
|
|
break;
|
|
/* Fall through. */
|
|
case 0x3c:
|
|
case 0x45:
|
|
case 0x46:
|
|
/* Disable Intel TSX on Haswell processors (except Xeon E7 v3
|
|
with stepping >= 4) to avoid TSX on kernels that weren't
|
|
updated with the latest microcode package (which disables
|
|
broken feature by default). */
|
|
CPU_FEATURE_UNSET (cpu_features, RTM);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/* Since AVX512ER is unique to Xeon Phi, set Prefer_No_VZEROUPPER
|
|
if AVX512ER is available. Don't use AVX512 to avoid lower CPU
|
|
frequency if AVX512ER isn't available. */
|
|
if (CPU_FEATURES_CPU_P (cpu_features, AVX512ER))
|
|
cpu_features->preferred[index_arch_Prefer_No_VZEROUPPER]
|
|
|= bit_arch_Prefer_No_VZEROUPPER;
|
|
else
|
|
{
|
|
/* Processors with AVX512 and AVX-VNNI won't lower CPU frequency
|
|
when ZMM load and store instructions are used. */
|
|
if (!CPU_FEATURES_CPU_P (cpu_features, AVX_VNNI))
|
|
cpu_features->preferred[index_arch_Prefer_No_AVX512]
|
|
|= bit_arch_Prefer_No_AVX512;
|
|
|
|
/* Avoid RTM abort triggered by VZEROUPPER inside a
|
|
transactionally executing RTM region. */
|
|
if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
|
|
cpu_features->preferred[index_arch_Prefer_No_VZEROUPPER]
|
|
|= bit_arch_Prefer_No_VZEROUPPER;
|
|
}
|
|
|
|
/* Avoid avoid short distance REP MOVSB on processor with FSRM. */
|
|
if (CPU_FEATURES_CPU_P (cpu_features, FSRM))
|
|
cpu_features->preferred[index_arch_Avoid_Short_Distance_REP_MOVSB]
|
|
|= bit_arch_Avoid_Short_Distance_REP_MOVSB;
|
|
}
|
|
/* This spells out "AuthenticAMD" or "HygonGenuine". */
|
|
else if ((ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
|
|
|| (ebx == 0x6f677948 && ecx == 0x656e6975 && edx == 0x6e65476e))
|
|
{
|
|
unsigned int extended_model;
|
|
|
|
kind = arch_kind_amd;
|
|
|
|
get_common_indices (cpu_features, &family, &model, &extended_model,
|
|
&stepping);
|
|
|
|
get_extended_indices (cpu_features);
|
|
|
|
update_active (cpu_features);
|
|
|
|
ecx = cpu_features->features[CPUID_INDEX_1].cpuid.ecx;
|
|
|
|
if (CPU_FEATURE_USABLE_P (cpu_features, AVX))
|
|
{
|
|
/* Since the FMA4 bit is in CPUID_INDEX_80000001 and
|
|
FMA4 requires AVX, determine if FMA4 is usable here. */
|
|
CPU_FEATURE_SET_ACTIVE (cpu_features, FMA4);
|
|
}
|
|
|
|
if (family == 0x15)
|
|
{
|
|
/* "Excavator" */
|
|
if (model >= 0x60 && model <= 0x7f)
|
|
{
|
|
cpu_features->preferred[index_arch_Fast_Unaligned_Load]
|
|
|= (bit_arch_Fast_Unaligned_Load
|
|
| bit_arch_Fast_Copy_Backward);
|
|
|
|
/* Unaligned AVX loads are slower.*/
|
|
cpu_features->preferred[index_arch_AVX_Fast_Unaligned_Load]
|
|
&= ~bit_arch_AVX_Fast_Unaligned_Load;
|
|
}
|
|
}
|
|
}
|
|
/* This spells out "CentaurHauls" or " Shanghai ". */
|
|
else if ((ebx == 0x746e6543 && ecx == 0x736c7561 && edx == 0x48727561)
|
|
|| (ebx == 0x68532020 && ecx == 0x20206961 && edx == 0x68676e61))
|
|
{
|
|
unsigned int extended_model, stepping;
|
|
|
|
kind = arch_kind_zhaoxin;
|
|
|
|
get_common_indices (cpu_features, &family, &model, &extended_model,
|
|
&stepping);
|
|
|
|
get_extended_indices (cpu_features);
|
|
|
|
update_active (cpu_features);
|
|
|
|
model += extended_model;
|
|
if (family == 0x6)
|
|
{
|
|
if (model == 0xf || model == 0x19)
|
|
{
|
|
CPU_FEATURE_UNSET (cpu_features, AVX);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX2);
|
|
|
|
cpu_features->preferred[index_arch_Slow_SSE4_2]
|
|
|= bit_arch_Slow_SSE4_2;
|
|
|
|
cpu_features->preferred[index_arch_AVX_Fast_Unaligned_Load]
|
|
&= ~bit_arch_AVX_Fast_Unaligned_Load;
|
|
}
|
|
}
|
|
else if (family == 0x7)
|
|
{
|
|
if (model == 0x1b)
|
|
{
|
|
CPU_FEATURE_UNSET (cpu_features, AVX);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX2);
|
|
|
|
cpu_features->preferred[index_arch_Slow_SSE4_2]
|
|
|= bit_arch_Slow_SSE4_2;
|
|
|
|
cpu_features->preferred[index_arch_AVX_Fast_Unaligned_Load]
|
|
&= ~bit_arch_AVX_Fast_Unaligned_Load;
|
|
}
|
|
else if (model == 0x3b)
|
|
{
|
|
CPU_FEATURE_UNSET (cpu_features, AVX);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX2);
|
|
|
|
cpu_features->preferred[index_arch_AVX_Fast_Unaligned_Load]
|
|
&= ~bit_arch_AVX_Fast_Unaligned_Load;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
kind = arch_kind_other;
|
|
get_common_indices (cpu_features, NULL, NULL, NULL, NULL);
|
|
update_active (cpu_features);
|
|
}
|
|
|
|
/* Support i586 if CX8 is available. */
|
|
if (CPU_FEATURES_CPU_P (cpu_features, CX8))
|
|
cpu_features->preferred[index_arch_I586] |= bit_arch_I586;
|
|
|
|
/* Support i686 if CMOV is available. */
|
|
if (CPU_FEATURES_CPU_P (cpu_features, CMOV))
|
|
cpu_features->preferred[index_arch_I686] |= bit_arch_I686;
|
|
|
|
#if !HAS_CPUID
|
|
no_cpuid:
|
|
#endif
|
|
|
|
cpu_features->basic.kind = kind;
|
|
cpu_features->basic.family = family;
|
|
cpu_features->basic.model = model;
|
|
cpu_features->basic.stepping = stepping;
|
|
|
|
dl_init_cacheinfo (cpu_features);
|
|
|
|
#if HAVE_TUNABLES
|
|
TUNABLE_GET (hwcaps, tunable_val_t *, TUNABLE_CALLBACK (set_hwcaps));
|
|
|
|
bool disable_xsave_features = false;
|
|
|
|
if (!CPU_FEATURE_USABLE_P (cpu_features, OSXSAVE))
|
|
{
|
|
/* These features are usable only if OSXSAVE is usable. */
|
|
CPU_FEATURE_UNSET (cpu_features, XSAVE);
|
|
CPU_FEATURE_UNSET (cpu_features, XSAVEOPT);
|
|
CPU_FEATURE_UNSET (cpu_features, XSAVEC);
|
|
CPU_FEATURE_UNSET (cpu_features, XGETBV_ECX_1);
|
|
CPU_FEATURE_UNSET (cpu_features, XFD);
|
|
|
|
disable_xsave_features = true;
|
|
}
|
|
|
|
if (disable_xsave_features
|
|
|| (!CPU_FEATURE_USABLE_P (cpu_features, XSAVE)
|
|
&& !CPU_FEATURE_USABLE_P (cpu_features, XSAVEC)))
|
|
{
|
|
/* Clear xsave_state_size if both XSAVE and XSAVEC aren't usable. */
|
|
cpu_features->xsave_state_size = 0;
|
|
|
|
CPU_FEATURE_UNSET (cpu_features, AVX);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX2);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX_VNNI);
|
|
CPU_FEATURE_UNSET (cpu_features, FMA);
|
|
CPU_FEATURE_UNSET (cpu_features, VAES);
|
|
CPU_FEATURE_UNSET (cpu_features, VPCLMULQDQ);
|
|
CPU_FEATURE_UNSET (cpu_features, XOP);
|
|
CPU_FEATURE_UNSET (cpu_features, F16C);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512F);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512CD);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512ER);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512PF);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512VL);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512DQ);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512BW);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512_4FMAPS);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512_4VNNIW);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512_BITALG);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512_IFMA);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512_VBMI);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512_VBMI2);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512_VNNI);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512_VPOPCNTDQ);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512_VP2INTERSECT);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512_BF16);
|
|
CPU_FEATURE_UNSET (cpu_features, AVX512_FP16);
|
|
CPU_FEATURE_UNSET (cpu_features, AMX_BF16);
|
|
CPU_FEATURE_UNSET (cpu_features, AMX_TILE);
|
|
CPU_FEATURE_UNSET (cpu_features, AMX_INT8);
|
|
|
|
CPU_FEATURE_UNSET (cpu_features, FMA4);
|
|
}
|
|
|
|
#elif defined SHARED
|
|
/* Reuse dl_platform, dl_hwcap and dl_hwcap_mask for x86. The
|
|
glibc.cpu.hwcap_mask tunable is initialized already, so no
|
|
need to do this. */
|
|
GLRO(dl_hwcap_mask) = HWCAP_IMPORTANT;
|
|
#endif
|
|
|
|
#ifdef __x86_64__
|
|
GLRO(dl_hwcap) = HWCAP_X86_64;
|
|
if (cpu_features->basic.kind == arch_kind_intel)
|
|
{
|
|
const char *platform = NULL;
|
|
|
|
if (CPU_FEATURE_USABLE_P (cpu_features, AVX512CD))
|
|
{
|
|
if (CPU_FEATURE_USABLE_P (cpu_features, AVX512ER))
|
|
{
|
|
if (CPU_FEATURE_USABLE_P (cpu_features, AVX512PF))
|
|
platform = "xeon_phi";
|
|
}
|
|
else
|
|
{
|
|
if (CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
|
|
&& CPU_FEATURE_USABLE_P (cpu_features, AVX512DQ)
|
|
&& CPU_FEATURE_USABLE_P (cpu_features, AVX512VL))
|
|
GLRO(dl_hwcap) |= HWCAP_X86_AVX512_1;
|
|
}
|
|
}
|
|
|
|
if (platform == NULL
|
|
&& CPU_FEATURE_USABLE_P (cpu_features, AVX2)
|
|
&& CPU_FEATURE_USABLE_P (cpu_features, FMA)
|
|
&& CPU_FEATURE_USABLE_P (cpu_features, BMI1)
|
|
&& CPU_FEATURE_USABLE_P (cpu_features, BMI2)
|
|
&& CPU_FEATURE_USABLE_P (cpu_features, LZCNT)
|
|
&& CPU_FEATURE_USABLE_P (cpu_features, MOVBE)
|
|
&& CPU_FEATURE_USABLE_P (cpu_features, POPCNT))
|
|
platform = "haswell";
|
|
|
|
if (platform != NULL)
|
|
GLRO(dl_platform) = platform;
|
|
}
|
|
#else
|
|
GLRO(dl_hwcap) = 0;
|
|
if (CPU_FEATURE_USABLE_P (cpu_features, SSE2))
|
|
GLRO(dl_hwcap) |= HWCAP_X86_SSE2;
|
|
|
|
if (CPU_FEATURES_ARCH_P (cpu_features, I686))
|
|
GLRO(dl_platform) = "i686";
|
|
else if (CPU_FEATURES_ARCH_P (cpu_features, I586))
|
|
GLRO(dl_platform) = "i586";
|
|
#endif
|
|
|
|
#if CET_ENABLED
|
|
# if HAVE_TUNABLES
|
|
TUNABLE_GET (x86_ibt, tunable_val_t *,
|
|
TUNABLE_CALLBACK (set_x86_ibt));
|
|
TUNABLE_GET (x86_shstk, tunable_val_t *,
|
|
TUNABLE_CALLBACK (set_x86_shstk));
|
|
# endif
|
|
|
|
/* Check CET status. */
|
|
unsigned int cet_status = get_cet_status ();
|
|
|
|
if ((cet_status & GNU_PROPERTY_X86_FEATURE_1_IBT) == 0)
|
|
CPU_FEATURE_UNSET (cpu_features, IBT)
|
|
if ((cet_status & GNU_PROPERTY_X86_FEATURE_1_SHSTK) == 0)
|
|
CPU_FEATURE_UNSET (cpu_features, SHSTK)
|
|
|
|
if (cet_status)
|
|
{
|
|
GL(dl_x86_feature_1) = cet_status;
|
|
|
|
# ifndef SHARED
|
|
/* Check if IBT and SHSTK are enabled by kernel. */
|
|
if ((cet_status & GNU_PROPERTY_X86_FEATURE_1_IBT)
|
|
|| (cet_status & GNU_PROPERTY_X86_FEATURE_1_SHSTK))
|
|
{
|
|
/* Disable IBT and/or SHSTK if they are enabled by kernel, but
|
|
disabled by environment variable:
|
|
|
|
GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK
|
|
*/
|
|
unsigned int cet_feature = 0;
|
|
if (!CPU_FEATURE_USABLE (IBT))
|
|
cet_feature |= GNU_PROPERTY_X86_FEATURE_1_IBT;
|
|
if (!CPU_FEATURE_USABLE (SHSTK))
|
|
cet_feature |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
|
|
|
|
if (cet_feature)
|
|
{
|
|
int res = dl_cet_disable_cet (cet_feature);
|
|
|
|
/* Clear the disabled bits in dl_x86_feature_1. */
|
|
if (res == 0)
|
|
GL(dl_x86_feature_1) &= ~cet_feature;
|
|
}
|
|
|
|
/* Lock CET if IBT or SHSTK is enabled in executable. Don't
|
|
lock CET if IBT or SHSTK is enabled permissively. */
|
|
if (GL(dl_x86_feature_control).ibt != cet_permissive
|
|
&& GL(dl_x86_feature_control).shstk != cet_permissive)
|
|
dl_cet_lock_cet ();
|
|
}
|
|
# endif
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}
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|
#endif
|
|
|
|
#ifndef SHARED
|
|
/* NB: In libc.a, call init_cacheinfo. */
|
|
init_cacheinfo ();
|
|
#endif
|
|
}
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