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dce452dc52
The glibc.tune namespace is vaguely named since it is a 'tunable', so give it a more specific name that describes what it refers to. Rename the tunable namespace to 'cpu' to more accurately reflect what it encompasses. Also rename glibc.tune.cpu to glibc.cpu.name since glibc.cpu.cpu is weird. * NEWS: Mention the change. * elf/dl-tunables.list: Rename tune namespace to cpu. * sysdeps/powerpc/dl-tunables.list: Likewise. * sysdeps/x86/dl-tunables.list: Likewise. * sysdeps/aarch64/dl-tunables.list: Rename tune.cpu to cpu.name. * elf/dl-hwcaps.c (_dl_important_hwcaps): Adjust. * elf/dl-hwcaps.h (GET_HWCAP_MASK): Likewise. * manual/README.tunables: Likewise. * manual/tunables.texi: Likewise. * sysdeps/powerpc/cpu-features.c: Likewise. * sysdeps/unix/sysv/linux/aarch64/cpu-features.c (init_cpu_features): Likewise. * sysdeps/x86/cpu-features.c: Likewise. * sysdeps/x86/cpu-features.h: Likewise. * sysdeps/x86/cpu-tunables.c: Likewise. * sysdeps/x86_64/Makefile: Likewise. * sysdeps/x86/dl-cet.c: Likewise. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
525 lines
15 KiB
C
525 lines
15 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) 2008-2018 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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<http://www.gnu.org/licenses/>. */
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#include <cpuid.h>
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#include <cpu-features.h>
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#include <dl-hwcap.h>
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#include <libc-pointer-arith.h>
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#if HAVE_TUNABLES
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# define TUNABLE_NAMESPACE cpu
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# include <unistd.h> /* Get STDOUT_FILENO for _dl_printf. */
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# include <elf/dl-tunables.h>
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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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# include <cet-tunables.h>
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#endif
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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->cpuid[COMMON_CPUID_INDEX_80000001].eax,
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cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].ebx,
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cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].ecx,
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cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].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, cpu_features->cpuid[COMMON_CPUID_INDEX_1].ebx,
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cpu_features->cpuid[COMMON_CPUID_INDEX_1].ecx,
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cpu_features->cpuid[COMMON_CPUID_INDEX_1].edx);
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cpu_features->cpuid[COMMON_CPUID_INDEX_1].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->max_cpuid >= 7)
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__cpuid_count (7, 0,
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cpu_features->cpuid[COMMON_CPUID_INDEX_7].eax,
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cpu_features->cpuid[COMMON_CPUID_INDEX_7].ebx,
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cpu_features->cpuid[COMMON_CPUID_INDEX_7].ecx,
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cpu_features->cpuid[COMMON_CPUID_INDEX_7].edx);
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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_features->feature[index_arch_AVX_Usable]
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|= bit_arch_AVX_Usable;
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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_features->feature[index_arch_AVX2_Usable]
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|= bit_arch_AVX2_Usable;
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/* Unaligned load with 256-bit AVX registers are faster on
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Intel/AMD processors with AVX2. */
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cpu_features->feature[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 FMA is usable. */
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if (CPU_FEATURES_CPU_P (cpu_features, FMA))
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cpu_features->feature[index_arch_FMA_Usable]
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|= bit_arch_FMA_Usable;
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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_features->feature[index_arch_AVX512F_Usable]
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|= bit_arch_AVX512F_Usable;
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/* Determine if AVX512DQ is usable. */
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if (CPU_FEATURES_CPU_P (cpu_features, AVX512DQ))
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cpu_features->feature[index_arch_AVX512DQ_Usable]
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|= bit_arch_AVX512DQ_Usable;
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}
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}
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}
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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->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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__cpuid_count (0xd, 1, eax, ebx, ecx, edx);
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/* Check if XSAVEC is available. */
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if ((eax & (1 << 1)) != 0)
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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_features->feature[index_arch_XSAVEC_Usable]
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|= bit_arch_XSAVEC_Usable;
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}
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}
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}
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}
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}
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}
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static inline void
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init_cpu_features (struct cpu_features *cpu_features)
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{
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unsigned int ebx, ecx, edx;
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unsigned int family = 0;
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unsigned int model = 0;
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enum cpu_features_kind kind;
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#if !HAS_CPUID
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if (__get_cpuid_max (0, 0) == 0)
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{
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kind = arch_kind_other;
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goto no_cpuid;
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}
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#endif
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__cpuid (0, cpu_features->max_cpuid, ebx, ecx, edx);
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/* This spells out "GenuineIntel". */
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if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69)
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{
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unsigned int extended_model, stepping;
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kind = arch_kind_intel;
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get_common_indices (cpu_features, &family, &model, &extended_model,
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&stepping);
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get_extended_indices (cpu_features);
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if (family == 0x06)
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{
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model += extended_model;
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switch (model)
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{
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case 0x1c:
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case 0x26:
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/* BSF is slow on Atom. */
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cpu_features->feature[index_arch_Slow_BSF]
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|= bit_arch_Slow_BSF;
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break;
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case 0x57:
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/* Knights Landing. Enable Silvermont optimizations. */
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case 0x5c:
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case 0x5f:
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/* Unaligned load versions are faster than SSSE3
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on Goldmont. */
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case 0x4c:
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/* Airmont is a die shrink of Silvermont. */
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case 0x37:
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case 0x4a:
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case 0x4d:
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case 0x5a:
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case 0x5d:
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/* Unaligned load versions are faster than SSSE3
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on Silvermont. */
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#if index_arch_Fast_Unaligned_Load != index_arch_Prefer_PMINUB_for_stringop
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# error index_arch_Fast_Unaligned_Load != index_arch_Prefer_PMINUB_for_stringop
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#endif
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#if index_arch_Fast_Unaligned_Load != index_arch_Slow_SSE4_2
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# error index_arch_Fast_Unaligned_Load != index_arch_Slow_SSE4_2
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#endif
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#if index_arch_Fast_Unaligned_Load != index_arch_Fast_Unaligned_Copy
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# error index_arch_Fast_Unaligned_Load != index_arch_Fast_Unaligned_Copy
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#endif
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cpu_features->feature[index_arch_Fast_Unaligned_Load]
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|= (bit_arch_Fast_Unaligned_Load
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| bit_arch_Fast_Unaligned_Copy
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| bit_arch_Prefer_PMINUB_for_stringop
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| bit_arch_Slow_SSE4_2);
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break;
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default:
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/* Unknown family 0x06 processors. Assuming this is one
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of Core i3/i5/i7 processors if AVX is available. */
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if (!CPU_FEATURES_CPU_P (cpu_features, AVX))
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break;
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case 0x1a:
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case 0x1e:
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case 0x1f:
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case 0x25:
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case 0x2c:
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case 0x2e:
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case 0x2f:
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/* Rep string instructions, unaligned load, unaligned copy,
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and pminub are fast on Intel Core i3, i5 and i7. */
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#if index_arch_Fast_Rep_String != index_arch_Fast_Unaligned_Load
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# error index_arch_Fast_Rep_String != index_arch_Fast_Unaligned_Load
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#endif
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#if index_arch_Fast_Rep_String != index_arch_Prefer_PMINUB_for_stringop
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# error index_arch_Fast_Rep_String != index_arch_Prefer_PMINUB_for_stringop
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#endif
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#if index_arch_Fast_Rep_String != index_arch_Fast_Unaligned_Copy
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# error index_arch_Fast_Rep_String != index_arch_Fast_Unaligned_Copy
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#endif
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cpu_features->feature[index_arch_Fast_Rep_String]
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|= (bit_arch_Fast_Rep_String
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| bit_arch_Fast_Unaligned_Load
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| bit_arch_Fast_Unaligned_Copy
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| bit_arch_Prefer_PMINUB_for_stringop);
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break;
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case 0x3f:
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/* Xeon E7 v3 with stepping >= 4 has working TSX. */
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if (stepping >= 4)
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break;
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case 0x3c:
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case 0x45:
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case 0x46:
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/* Disable Intel TSX on Haswell processors (except Xeon E7 v3
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with stepping >= 4) to avoid TSX on kernels that weren't
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updated with the latest microcode package (which disables
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broken feature by default). */
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cpu_features->cpuid[index_cpu_RTM].reg_RTM &= ~bit_cpu_RTM;
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break;
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}
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}
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/* Since AVX512ER is unique to Xeon Phi, set Prefer_No_VZEROUPPER
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if AVX512ER is available. Don't use AVX512 to avoid lower CPU
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frequency if AVX512ER isn't available. */
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if (CPU_FEATURES_CPU_P (cpu_features, AVX512ER))
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cpu_features->feature[index_arch_Prefer_No_VZEROUPPER]
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|= bit_arch_Prefer_No_VZEROUPPER;
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else
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cpu_features->feature[index_arch_Prefer_No_AVX512]
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|= bit_arch_Prefer_No_AVX512;
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}
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/* This spells out "AuthenticAMD". */
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else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
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{
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unsigned int extended_model, stepping;
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kind = arch_kind_amd;
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get_common_indices (cpu_features, &family, &model, &extended_model,
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&stepping);
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get_extended_indices (cpu_features);
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ecx = cpu_features->cpuid[COMMON_CPUID_INDEX_1].ecx;
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if (HAS_ARCH_FEATURE (AVX_Usable))
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{
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/* Since the FMA4 bit is in COMMON_CPUID_INDEX_80000001 and
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FMA4 requires AVX, determine if FMA4 is usable here. */
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if (CPU_FEATURES_CPU_P (cpu_features, FMA4))
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cpu_features->feature[index_arch_FMA4_Usable]
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|= bit_arch_FMA4_Usable;
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}
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if (family == 0x15)
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{
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#if index_arch_Fast_Unaligned_Load != index_arch_Fast_Copy_Backward
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# error index_arch_Fast_Unaligned_Load != index_arch_Fast_Copy_Backward
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#endif
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/* "Excavator" */
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if (model >= 0x60 && model <= 0x7f)
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{
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cpu_features->feature[index_arch_Fast_Unaligned_Load]
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|= (bit_arch_Fast_Unaligned_Load
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| bit_arch_Fast_Copy_Backward);
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/* Unaligned AVX loads are slower.*/
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cpu_features->feature[index_arch_AVX_Fast_Unaligned_Load]
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&= ~bit_arch_AVX_Fast_Unaligned_Load;
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}
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}
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}
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else
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{
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kind = arch_kind_other;
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get_common_indices (cpu_features, NULL, NULL, NULL, NULL);
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}
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/* Support i586 if CX8 is available. */
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if (CPU_FEATURES_CPU_P (cpu_features, CX8))
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cpu_features->feature[index_arch_I586] |= bit_arch_I586;
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/* Support i686 if CMOV is available. */
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if (CPU_FEATURES_CPU_P (cpu_features, CMOV))
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cpu_features->feature[index_arch_I686] |= bit_arch_I686;
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#if !HAS_CPUID
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no_cpuid:
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#endif
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cpu_features->family = family;
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cpu_features->model = model;
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cpu_features->kind = kind;
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#if HAVE_TUNABLES
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TUNABLE_GET (hwcaps, tunable_val_t *, TUNABLE_CALLBACK (set_hwcaps));
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cpu_features->non_temporal_threshold
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= TUNABLE_GET (x86_non_temporal_threshold, long int, NULL);
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cpu_features->data_cache_size
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= TUNABLE_GET (x86_data_cache_size, long int, NULL);
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cpu_features->shared_cache_size
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= TUNABLE_GET (x86_shared_cache_size, long int, NULL);
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#endif
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/* Reuse dl_platform, dl_hwcap and dl_hwcap_mask for x86. */
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#if !HAVE_TUNABLES && defined SHARED
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/* The glibc.cpu.hwcap_mask tunable is initialized already, so no need to do
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this. */
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GLRO(dl_hwcap_mask) = HWCAP_IMPORTANT;
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#endif
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#ifdef __x86_64__
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GLRO(dl_hwcap) = HWCAP_X86_64;
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if (cpu_features->kind == arch_kind_intel)
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{
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const char *platform = NULL;
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if (CPU_FEATURES_ARCH_P (cpu_features, AVX512F_Usable)
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&& CPU_FEATURES_CPU_P (cpu_features, AVX512CD))
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{
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if (CPU_FEATURES_CPU_P (cpu_features, AVX512ER))
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{
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if (CPU_FEATURES_CPU_P (cpu_features, AVX512PF))
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platform = "xeon_phi";
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}
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else
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{
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if (CPU_FEATURES_CPU_P (cpu_features, AVX512BW)
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&& CPU_FEATURES_CPU_P (cpu_features, AVX512DQ)
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&& CPU_FEATURES_CPU_P (cpu_features, AVX512VL))
|
|
GLRO(dl_hwcap) |= HWCAP_X86_AVX512_1;
|
|
}
|
|
}
|
|
|
|
if (platform == NULL
|
|
&& CPU_FEATURES_ARCH_P (cpu_features, AVX2_Usable)
|
|
&& CPU_FEATURES_ARCH_P (cpu_features, FMA_Usable)
|
|
&& CPU_FEATURES_CPU_P (cpu_features, BMI1)
|
|
&& CPU_FEATURES_CPU_P (cpu_features, BMI2)
|
|
&& CPU_FEATURES_CPU_P (cpu_features, LZCNT)
|
|
&& CPU_FEATURES_CPU_P (cpu_features, MOVBE)
|
|
&& CPU_FEATURES_CPU_P (cpu_features, POPCNT))
|
|
platform = "haswell";
|
|
|
|
if (platform != NULL)
|
|
GLRO(dl_platform) = platform;
|
|
}
|
|
#else
|
|
GLRO(dl_hwcap) = 0;
|
|
if (CPU_FEATURES_CPU_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)
|
|
{
|
|
GL(dl_x86_feature_1)[0] = 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 (!HAS_CPU_FEATURE (IBT))
|
|
cet_feature |= GNU_PROPERTY_X86_FEATURE_1_IBT;
|
|
if (!HAS_CPU_FEATURE (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)[0] &= ~cet_feature;
|
|
}
|
|
|
|
/* Lock CET if IBT or SHSTK is enabled in executable. Don't
|
|
lock CET if SHSTK is enabled permissively. */
|
|
if (((GL(dl_x86_feature_1)[1] >> CET_MAX)
|
|
& ((1 << CET_MAX) - 1))
|
|
!= CET_PERMISSIVE)
|
|
dl_cet_lock_cet ();
|
|
}
|
|
# endif
|
|
}
|
|
#endif
|
|
}
|