util/cpuinfo-ppc.c

   1 /*
   2  * SPDX-License-Identifier: GPL-2.0-or-later
   3  * Host specific cpu identification for ppc.
   4  */
   5
   6 #include "qemu/osdep.h"
   7 #include "host/cpuinfo.h"
   8
   9 #ifdef CONFIG_LINUX
  10 # include <asm/cputable.h>
  11 # ifdef CONFIG_GETAUXVAL
  12 #  include <sys/auxv.h>
  13 # else
  14 #  include "elf.h"
  15 # endif
  16 #endif
  17 #if defined(CONFIG_ELF_AUX_INFO)
  18 # include <sys/auxv.h>
  19 # include <machine/cpu.h>
  20 # ifndef PPC_FEATURE2_ARCH_3_1
  21 #  define PPC_FEATURE2_ARCH_3_1   0
  22 # endif
  23 # define PPC_FEATURE2_VEC_CRYPTO  PPC_FEATURE2_HAS_VEC_CRYPTO
  24 #endif
  25
  26 unsigned cpuinfo;
  27
  28 /* Called both as constructor and (possibly) via other constructors. */
  29 unsigned __attribute__((constructor)) cpuinfo_init(void)
  30 {
  31     unsigned info = cpuinfo;
  32
  33     if (info) {
  34         return info;
  35     }
  36
  37     info = CPUINFO_ALWAYS;
  38
  39 #if defined(CONFIG_LINUX) || defined(CONFIG_ELF_AUX_INFO)
  40     unsigned long hwcap = qemu_getauxval(AT_HWCAP);
  41     unsigned long hwcap2 = qemu_getauxval(AT_HWCAP2);
  42
  43     /* Version numbers are monotonic, and so imply all lower versions. */
  44     if (hwcap2 & PPC_FEATURE2_ARCH_3_1) {
  45         info |= CPUINFO_V3_1 | CPUINFO_V3_0 | CPUINFO_V2_07 | CPUINFO_V2_06;
  46     } else if (hwcap2 & PPC_FEATURE2_ARCH_3_00) {
  47         info |= CPUINFO_V3_0 | CPUINFO_V2_07 | CPUINFO_V2_06;
  48     } else if (hwcap2 & PPC_FEATURE2_ARCH_2_07) {
  49         info |= CPUINFO_V2_07 | CPUINFO_V2_06;
  50     } else if (hwcap & PPC_FEATURE_ARCH_2_06) {
  51         info |= CPUINFO_V2_06;
  52     }
  53
  54     if (hwcap2 & PPC_FEATURE2_ISEL) {
  55         info |= CPUINFO_ISEL;
  56     }
  57     if (hwcap & PPC_FEATURE_HAS_ALTIVEC) {
  58         info |= CPUINFO_ALTIVEC;
  59         /* We only care about the portion of VSX that overlaps Altivec. */
  60         if (hwcap & PPC_FEATURE_HAS_VSX) {
  61             info |= CPUINFO_VSX;
  62             /*
  63              * We use VSX especially for little-endian, but we should
  64              * always have both anyway, since VSX came with Power7
  65              * and crypto came with Power8.
  66              */
  67             if (hwcap2 & PPC_FEATURE2_VEC_CRYPTO) {
  68                 info |= CPUINFO_CRYPTO;
  69             }
  70         }
  71     }
  72 #endif
  73
  74     cpuinfo = info;
  75     return info;
  76 }