drivers/filesystems/btrfs/zstd/cpu.h

   1 /*
   2  * Copyright (c) 2018-present, Facebook, Inc.
   3  * All rights reserved.
   4  *
   5  * This source code is licensed under both the BSD-style license (found in the
   6  * LICENSE file in the root directory of this source tree) and the GPLv2 (found
   7  * in the COPYING file in the root directory of this source tree).
   8  * You may select, at your option, one of the above-listed licenses.
   9  */
  10
  11 #ifndef ZSTD_COMMON_CPU_H
  12 #define ZSTD_COMMON_CPU_H
  13
  14 /**
  15  * Implementation taken from folly/CpuId.h
  16  * https://github.com/facebook/folly/blob/master/folly/CpuId.h
  17  */
  18
  19 #include <string.h>
  20
  21 #include "mem.h"
  22
  23 #ifdef _MSC_VER
  24 #include <intrin.h>
  25 #endif
  26
  27 typedef struct {
  28     U32 f1c;
  29     U32 f1d;
  30     U32 f7b;
  31     U32 f7c;
  32 } ZSTD_cpuid_t;
  33
  34 MEM_STATIC ZSTD_cpuid_t ZSTD_cpuid(void) {
  35     U32 f1c = 0;
  36     U32 f1d = 0;
  37     U32 f7b = 0;
  38     U32 f7c = 0;
  39 #if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_IX86))
  40     int reg[4];
  41     __cpuid((int*)reg, 0);
  42     {
  43         int const n = reg[0];
  44         if (n >= 1) {
  45             __cpuid((int*)reg, 1);
  46             f1c = (U32)reg[2];
  47             f1d = (U32)reg[3];
  48         }
  49         if (n >= 7) {
  50             __cpuidex((int*)reg, 7, 0);
  51             f7b = (U32)reg[1];
  52             f7c = (U32)reg[2];
  53         }
  54     }
  55 #elif defined(__i386__) && defined(__PIC__) && !defined(__clang__) && defined(__GNUC__)
  56     /* The following block like the normal cpuid branch below, but gcc
  57      * reserves ebx for use of its pic register so we must specially
  58      * handle the save and restore to avoid clobbering the register
  59      */
  60     U32 n;
  61     __asm__(
  62         "pushl %%ebx\n\t"
  63         "cpuid\n\t"
  64         "popl %%ebx\n\t"
  65         : "=a"(n)
  66         : "a"(0)
  67         : "ecx", "edx");
  68     if (n >= 1) {
  69       U32 f1a;
  70       __asm__(
  71           "pushl %%ebx\n\t"
  72           "cpuid\n\t"
  73           "popl %%ebx\n\t"
  74           : "=a"(f1a), "=c"(f1c), "=d"(f1d)
  75           : "a"(1));
  76     }
  77     if (n >= 7) {
  78       __asm__(
  79           "pushl %%ebx\n\t"
  80           "cpuid\n\t"
  81           "movl %%ebx, %%eax\n\r"
  82           "popl %%ebx"
  83           : "=a"(f7b), "=c"(f7c)
  84           : "a"(7), "c"(0)
  85           : "edx");
  86     }
  87 #elif defined(__x86_64__) || defined(_M_X64) || defined(__i386__)
  88     U32 n;
  89     __asm__("cpuid" : "=a"(n) : "a"(0) : "ebx", "ecx", "edx");
  90     if (n >= 1) {
  91       U32 f1a;
  92       __asm__("cpuid" : "=a"(f1a), "=c"(f1c), "=d"(f1d) : "a"(1) : "ebx");
  93     }
  94     if (n >= 7) {
  95       U32 f7a;
  96       __asm__("cpuid"
  97               : "=a"(f7a), "=b"(f7b), "=c"(f7c)
  98               : "a"(7), "c"(0)
  99               : "edx");
 100     }
 101 #endif
 102     {
 103         ZSTD_cpuid_t cpuid;
 104         cpuid.f1c = f1c;
 105         cpuid.f1d = f1d;
 106         cpuid.f7b = f7b;
 107         cpuid.f7c = f7c;
 108         return cpuid;
 109     }
 110 }
 111
 112 #define X(name, r, bit)                                                        \
 113   MEM_STATIC int ZSTD_cpuid_##name(ZSTD_cpuid_t const cpuid) {                 \
 114     return ((cpuid.r) & (1U << bit)) != 0;                                     \
 115   }
 116
 117 /* cpuid(1): Processor Info and Feature Bits. */
 118 #define C(name, bit) X(name, f1c, bit)
 119   C(sse3, 0)
 120   C(pclmuldq, 1)
 121   C(dtes64, 2)
 122   C(monitor, 3)
 123   C(dscpl, 4)
 124   C(vmx, 5)
 125   C(smx, 6)
 126   C(eist, 7)
 127   C(tm2, 8)
 128   C(ssse3, 9)
 129   C(cnxtid, 10)
 130   C(fma, 12)
 131   C(cx16, 13)
 132   C(xtpr, 14)
 133   C(pdcm, 15)
 134   C(pcid, 17)
 135   C(dca, 18)
 136   C(sse41, 19)
 137   C(sse42, 20)
 138   C(x2apic, 21)
 139   C(movbe, 22)
 140   C(popcnt, 23)
 141   C(tscdeadline, 24)
 142   C(aes, 25)
 143   C(xsave, 26)
 144   C(osxsave, 27)
 145   C(avx, 28)
 146   C(f16c, 29)
 147   C(rdrand, 30)
 148 #undef C
 149 #define D(name, bit) X(name, f1d, bit)
 150   D(fpu, 0)
 151   D(vme, 1)
 152   D(de, 2)
 153   D(pse, 3)
 154   D(tsc, 4)
 155   D(msr, 5)
 156   D(pae, 6)
 157   D(mce, 7)
 158   D(cx8, 8)
 159   D(apic, 9)
 160   D(sep, 11)
 161   D(mtrr, 12)
 162   D(pge, 13)
 163   D(mca, 14)
 164   D(cmov, 15)
 165   D(pat, 16)
 166   D(pse36, 17)
 167   D(psn, 18)
 168   D(clfsh, 19)
 169   D(ds, 21)
 170   D(acpi, 22)
 171   D(mmx, 23)
 172   D(fxsr, 24)
 173   D(sse, 25)
 174   D(sse2, 26)
 175   D(ss, 27)
 176   D(htt, 28)
 177   D(tm, 29)
 178   D(pbe, 31)
 179 #undef D
 180
 181 /* cpuid(7): Extended Features. */
 182 #define B(name, bit) X(name, f7b, bit)
 183   B(bmi1, 3)
 184   B(hle, 4)
 185   B(avx2, 5)
 186   B(smep, 7)
 187   B(bmi2, 8)
 188   B(erms, 9)
 189   B(invpcid, 10)
 190   B(rtm, 11)
 191   B(mpx, 14)
 192   B(avx512f, 16)
 193   B(avx512dq, 17)
 194   B(rdseed, 18)
 195   B(adx, 19)
 196   B(smap, 20)
 197   B(avx512ifma, 21)
 198   B(pcommit, 22)
 199   B(clflushopt, 23)
 200   B(clwb, 24)
 201   B(avx512pf, 26)
 202   B(avx512er, 27)
 203   B(avx512cd, 28)
 204   B(sha, 29)
 205   B(avx512bw, 30)
 206   B(avx512vl, 31)
 207 #undef B
 208 #define C(name, bit) X(name, f7c, bit)
 209   C(prefetchwt1, 0)
 210   C(avx512vbmi, 1)
 211 #undef C
 212
 213 #undef X
 214
 215 #endif /* ZSTD_COMMON_CPU_H */