mono/utils/mono-hwcap-riscv.c

   1 /*
   2  * Licensed to the .NET Foundation under one or more agreements.
   3  * The .NET Foundation licenses this file to you under the MIT license.
   4  * See the LICENSE file in the project root for more information.
   5  */
   6
   7 #include <mono/utils/mono-hwcap.h>
   8
   9 #include <sys/auxv.h>
  10
  11 void
  12 mono_hwcap_arch_init (void)
  13 {
  14         // See arch/riscv/include/uapi/asm/hwcap.h in the kernel source tree.
  15
  16         unsigned long hwcap;
  17
  18         if ((hwcap = getauxval (AT_HWCAP))) {
  19                 // COMPAT_HWCAP_ISA_A
  20                 if (hwcap & (1 << ('A' - 'A')))
  21                         mono_hwcap_riscv_has_stdext_a = TRUE;
  22
  23                 // COMPAT_HWCAP_ISA_C
  24                 if (hwcap & (1 << ('C' - 'A')))
  25                         mono_hwcap_riscv_has_stdext_c = TRUE;
  26
  27                 // COMPAT_HWCAP_ISA_D
  28                 if (hwcap & (1 << ('D' - 'A')))
  29                         mono_hwcap_riscv_has_stdext_d = TRUE;
  30
  31                 // COMPAT_HWCAP_ISA_F
  32                 if (hwcap & (1 << ('F' - 'A')))
  33                         mono_hwcap_riscv_has_stdext_f = TRUE;
  34
  35                 // Why does COMPAT_HWCAP_ISA_I even exist...?
  36
  37                 // COMPAT_HWCAP_ISA_M
  38                 if (hwcap & (1 << ('M' - 'A')))
  39                         mono_hwcap_riscv_has_stdext_m = TRUE;
  40         }
  41 }