mono/utils/mono-hwcap-ppc.c

   1 /**
   2  * \file
   3  * PowerPC hardware feature detection
   4  *
   5  * Authors:
   6  *    Alex Rønne Petersen (alexrp@xamarin.com)
   7  *    Elijah Taylor (elijahtaylor@google.com)
   8  *    Miguel de Icaza (miguel@xamarin.com)
   9  *    Neale Ferguson (Neale.Ferguson@SoftwareAG-usa.com)
  10  *    Paolo Molaro (lupus@xamarin.com)
  11  *    Rodrigo Kumpera (kumpera@gmail.com)
  12  *    Sebastien Pouliot (sebastien@xamarin.com)
  13  *    Zoltan Varga (vargaz@xamarin.com)
  14  *
  15  * Copyright 2003 Ximian, Inc.
  16  * Copyright 2003-2011 Novell, Inc
  17  * Copyright 2006 Broadcom
  18  * Copyright 2007-2008 Andreas Faerber
  19  * Copyright 2011-2013 Xamarin Inc
  20  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
  21  */
  22
  23 #include "mono/utils/mono-hwcap.h"
  24
  25 #if defined(__linux__) && defined(HAVE_SYS_AUXV_H)
  26 #include <string.h>
  27 #include <sys/auxv.h>
  28 #elif defined(_AIX)
  29 #include <sys/systemcfg.h>
  30 #endif
  31
  32 void
  33 mono_hwcap_arch_init (void)
  34 {
  35 #if defined(__linux__) && defined(HAVE_SYS_AUXV_H)
  36         unsigned long hwcap;
  37         unsigned long platform;
  38
  39         if ((hwcap = getauxval(AT_HWCAP))) {
  40                 /* PPC_FEATURE_ICACHE_SNOOP */
  41                 if (hwcap & 0x00002000)
  42                         mono_hwcap_ppc_has_icache_snoop = TRUE;
  43
  44                 /* PPC_FEATURE_POWER4, PPC_FEATURE_POWER5, PPC_FEATURE_POWER5_PLUS,
  45                    PPC_FEATURE_CELL_BE, PPC_FEATURE_PA6T, PPC_FEATURE_ARCH_2_05 */
  46                 if (hwcap & (0x00080000 | 0x00040000 | 0x00020000 | 0x00010000 | 0x00000800 | 0x00001000))
  47                         mono_hwcap_ppc_is_isa_2x = TRUE;
  48
  49                 /* PPC_FEATURE_64 */
  50                 if (hwcap & 0x40000000)
  51                         mono_hwcap_ppc_is_isa_64 = TRUE;
  52
  53                 /* PPC_FEATURE_POWER6_EXT */
  54                 if (hwcap & 0x00000200)
  55                         mono_hwcap_ppc_has_move_fpr_gpr = TRUE;
  56         }
  57
  58         if ((platform = getauxval(AT_PLATFORM))) {
  59                 const char *str = (const char *) platform;
  60
  61                 if (!strcmp (str, "ppc970") || (!strncmp (str, "power", 5) && str [5] >= '4' && str [5] <= '7'))
  62                         mono_hwcap_ppc_has_multiple_ls_units = TRUE;
  63         }
  64 #elif defined(_AIX)
  65         if (__cpu64())
  66                 mono_hwcap_ppc_is_isa_64 = TRUE;
  67         if (__power_4_andup())
  68                 mono_hwcap_ppc_is_isa_2x = TRUE;
  69         if (__power_5_andup())
  70                 mono_hwcap_ppc_has_icache_snoop = TRUE;
  71         /* not on POWER8 */
  72         if (__power_4() || __power_5() || __power_6() || __power_7())
  73                 mono_hwcap_ppc_has_multiple_ls_units = TRUE;
  74         /*
  75          * I dont see a way to get extended POWER6 and the PV_6_1
  76          * def seems to be trigged on the POWER6 here despite not
  77          * having these extended instructions, so POWER7 it is
  78          */
  79         /*
  80          * WARNING: reports that this doesn't actually work, try
  81          * to re-enable after more investigation
  82          */
  83         /*
  84         if (__power_7_andup())
  85                 mono_hwcap_ppc_has_move_fpr_gpr = TRUE;
  86          */
  87 #endif
  88 }