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 #ifdef __FreeBSD__
  18 # include <machine/cpu.h>
  19 # ifndef PPC_FEATURE2_ARCH_3_1
  20 #  define PPC_FEATURE2_ARCH_3_1   0
  21 # endif
  22 # define PPC_FEATURE2_VEC_CRYPTO  PPC_FEATURE2_HAS_VEC_CRYPTO
  23 #endif
  24
  25 unsigned cpuinfo;
  26
  27 /* Called both as constructor and (possibly) via other constructors. */
  28 unsigned __attribute__((constructor)) cpuinfo_init(void)
  29 {
  30     unsigned info = cpuinfo;
  31
  32     if (info) {
  33         return info;
  34     }
  35
  36     info = CPUINFO_ALWAYS;
  37
  38 #if defined(CONFIG_LINUX) || defined(__FreeBSD__)
  39     unsigned long hwcap = qemu_getauxval(AT_HWCAP);
  40     unsigned long hwcap2 = qemu_getauxval(AT_HWCAP2);
  41
  42     /* Version numbers are monotonic, and so imply all lower versions. */
  43     if (hwcap2 & PPC_FEATURE2_ARCH_3_1) {
  44         info |= CPUINFO_V3_1 | CPUINFO_V3_0 | CPUINFO_V2_07 | CPUINFO_V2_06;
  45     } else if (hwcap2 & PPC_FEATURE2_ARCH_3_00) {
  46         info |= CPUINFO_V3_0 | CPUINFO_V2_07 | CPUINFO_V2_06;
  47     } else if (hwcap2 & PPC_FEATURE2_ARCH_2_07) {
  48         info |= CPUINFO_V2_07 | CPUINFO_V2_06;
  49     } else if (hwcap & PPC_FEATURE_ARCH_2_06) {
  50         info |= CPUINFO_V2_06;
  51     }
  52
  53     if (hwcap2 & PPC_FEATURE2_ISEL) {
  54         info |= CPUINFO_ISEL;
  55     }
  56     if (hwcap & PPC_FEATURE_HAS_ALTIVEC) {
  57         info |= CPUINFO_ALTIVEC;
  58         /* We only care about the portion of VSX that overlaps Altivec. */
  59         if (hwcap & PPC_FEATURE_HAS_VSX) {
  60             info |= CPUINFO_VSX;
  61             /*
  62              * We use VSX especially for little-endian, but we should
  63              * always have both anyway, since VSX came with Power7
  64              * and crypto came with Power8.
  65              */
  66             if (hwcap2 & PPC_FEATURE2_VEC_CRYPTO) {
  67                 info |= CPUINFO_CRYPTO;
  68             }
  69         }
  70     }
  71 #endif
  72
  73     cpuinfo = info;
  74     return info;
  75 }