gdb/nat/x86-cpuid.h

   1 /* C API for x86 cpuid insn.
   2    Copyright (C) 2007-2023 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This file is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 3, or (at your option) any
   9    later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef NAT_X86_CPUID_H
  20 #define NAT_X86_CPUID_H
  21
  22 /* Always include the header for the cpu bit defines.  */
  23 #include "x86-gcc-cpuid.h"
  24
  25 #ifndef __cplusplus
  26 /* This header file is also used in C code for some test-cases, so define
  27    nullptr in C terms to avoid a compilation error.  */
  28 #define nullptr ((void *) 0)
  29 #endif
  30
  31 /* Return cpuid data for requested cpuid level, as found in returned
  32    eax, ebx, ecx and edx registers.  The function checks if cpuid is
  33    supported and returns 1 for valid cpuid information or 0 for
  34    unsupported cpuid level.  Pointers may be non-null.  */
  35
  36 static __inline int
  37 x86_cpuid (unsigned int __level,
  38             unsigned int *__eax, unsigned int *__ebx,
  39             unsigned int *__ecx, unsigned int *__edx)
  40 {
  41   unsigned int __scratch;
  42
  43   if (!__eax)
  44     __eax = &__scratch;
  45   if (!__ebx)
  46     __ebx = &__scratch;
  47   if (!__ecx)
  48     __ecx = &__scratch;
  49   if (!__edx)
  50     __edx = &__scratch;
  51
  52   return __get_cpuid (__level, __eax, __ebx, __ecx, __edx);
  53 }
  54
  55 /* Return cpuid data for requested cpuid level and sub-level, as found
  56    in returned eax, ebx, ecx and edx registers.  The function checks
  57    if cpuid is supported and returns 1 for valid cpuid information or
  58    0 for unsupported cpuid level.  Pointers may be non-null.  */
  59
  60 static __inline int
  61 x86_cpuid_count (unsigned int __level, unsigned int __sublevel,
  62                  unsigned int *__eax, unsigned int *__ebx,
  63                  unsigned int *__ecx, unsigned int *__edx)
  64 {
  65   unsigned int __scratch;
  66
  67   if (__eax == nullptr)
  68     __eax = &__scratch;
  69   if (__ebx == nullptr)
  70     __ebx = &__scratch;
  71   if (__ecx == nullptr)
  72     __ecx = &__scratch;
  73   if (__edx == nullptr)
  74     __edx = &__scratch;
  75
  76   return __get_cpuid_count (__level, __sublevel, __eax, __ebx, __ecx, __edx);
  77 }
  78
  79 #ifndef __cplusplus
  80 /* Avoid leaking this local definition beyond the scope of this header
  81    file.  */
  82 #undef nullptr
  83 #endif
  84
  85 #endif /* NAT_X86_CPUID_H */