gcc_x86_cpuid.h

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/*
 * Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
 *
 * This file is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 3, or (at your option) any
 * later version.
 * 
 * This file is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * Under Section 7 of GPL version 3, you are granted additional
 * permissions described in the GCC Runtime Library Exception, version
 * 3.1, as published by the Free Software Foundation.
 * 
 * You should have received a copy of the GNU General Public License and
 * a copy of the GCC Runtime Library Exception along with this program;
 * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

/* %ecx */
#define bit_SSE3        (1 << 0)
#define bit_PCLMUL      (1 << 1)
#define bit_SSSE3       (1 << 9)
#define bit_FMA         (1 << 12)
#define bit_CMPXCHG16B  (1 << 13)
#define bit_SSE4_1      (1 << 19)
#define bit_SSE4_2      (1 << 20)
#define bit_MOVBE       (1 << 22)
#define bit_POPCNT      (1 << 23)
#define bit_AES         (1 << 25)
#define bit_XSAVE       (1 << 26)
#define bit_OSXSAVE     (1 << 27)
#define bit_AVX         (1 << 28)

/* %edx */
#define bit_CMPXCHG8B   (1 << 8)
#define bit_CMOV        (1 << 15)
#define bit_MMX         (1 << 23)
#define bit_FXSAVE      (1 << 24)
#define bit_SSE         (1 << 25)
#define bit_SSE2        (1 << 26)

/* Extended Features */
/* %ecx */
#define bit_LAHF_LM     (1 << 0)
#define bit_SSE4a       (1 << 6)
#define bit_SSE5        (1 << 11)

/* %edx */
#define bit_LM          (1 << 29)
#define bit_3DNOWP      (1 << 30)
#define bit_3DNOW       (1 << 31)


#if defined(__i386__) && defined(__PIC__)
/* %ebx may be the PIC register.  */
#if __GNUC__ >= 3
#define __cpuid(level, a, b, c, d)                      \
  __asm__ ("xchg{l}\t{%%}ebx, %1\n\t"                   \
           "cpuid\n\t"                                  \
           "xchg{l}\t{%%}ebx, %1\n\t"                   \
           : "=a" (a), "=r" (b), "=c" (c), "=d" (d)     \
           : "0" (level))

#define __cpuid_count(level, count, a, b, c, d)         \
  __asm__ ("xchg{l}\t{%%}ebx, %1\n\t"                   \
           "cpuid\n\t"                                  \
           "xchg{l}\t{%%}ebx, %1\n\t"                   \
           : "=a" (a), "=r" (b), "=c" (c), "=d" (d)     \
           : "0" (level), "2" (count))
#else
/* Host GCCs older than 3.0 weren't supporting Intel asm syntax
   nor alternatives in i386 code.  */
#define __cpuid(level, a, b, c, d)                      \
  __asm__ ("xchgl\t%%ebx, %1\n\t"                       \
           "cpuid\n\t"                                  \
           "xchgl\t%%ebx, %1\n\t"                       \
           : "=a" (a), "=r" (b), "=c" (c), "=d" (d)     \
           : "0" (level))

#define __cpuid_count(level, count, a, b, c, d)         \
  __asm__ ("xchgl\t%%ebx, %1\n\t"                       \
           "cpuid\n\t"                                  \
           "xchgl\t%%ebx, %1\n\t"                       \
           : "=a" (a), "=r" (b), "=c" (c), "=d" (d)     \
           : "0" (level), "2" (count))
#endif
#else
#define __cpuid(level, a, b, c, d)                      \
  __asm__ ("cpuid\n\t"                                  \
           : "=a" (a), "=b" (b), "=c" (c), "=d" (d)     \
           : "0" (level))

#define __cpuid_count(level, count, a, b, c, d)         \
  __asm__ ("cpuid\n\t"                                  \
           : "=a" (a), "=b" (b), "=c" (c), "=d" (d)     \
           : "0" (level), "2" (count))
#endif

/* Return highest supported input value for cpuid instruction.  ext can
   be either 0x0 or 0x8000000 to return highest supported value for
   basic or extended cpuid information.  Function returns 0 if cpuid
   is not supported or whatever cpuid returns in eax register.  If sig
   pointer is non-null, then first four bytes of the signature
   (as found in ebx register) are returned in location pointed by sig.  */

static __inline unsigned int
__get_cpuid_max (unsigned int __ext, unsigned int *__sig)
{
  unsigned int __eax, __ebx, __ecx, __edx;

#ifndef __x86_64__
#if __GNUC__ >= 3
  /* See if we can use cpuid.  On AMD64 we always can.  */
  __asm__ ("pushf{l|d}\n\t"
           "pushf{l|d}\n\t"
           "pop{l}\t%0\n\t"
           "mov{l}\t{%0, %1|%1, %0}\n\t"
           "xor{l}\t{%2, %0|%0, %2}\n\t"
           "push{l}\t%0\n\t"
           "popf{l|d}\n\t"
           "pushf{l|d}\n\t"
           "pop{l}\t%0\n\t"
           "popf{l|d}\n\t"
           : "=&r" (__eax), "=&r" (__ebx)
           : "i" (0x00200000));
#else
/* Host GCCs older than 3.0 weren't supporting Intel asm syntax
   nor alternatives in i386 code.  */
  __asm__ ("pushfl\n\t"
           "pushfl\n\t"
           "popl\t%0\n\t"
           "movl\t%0, %1\n\t"
           "xorl\t%2, %0\n\t"
           "pushl\t%0\n\t"
           "popfl\n\t"
           "pushfl\n\t"
           "popl\t%0\n\t"
           "popfl\n\t"
           : "=&r" (__eax), "=&r" (__ebx)
           : "i" (0x00200000));
#endif

  if (!((__eax ^ __ebx) & 0x00200000))
    return 0;
#endif

  /* Host supports cpuid.  Return highest supported cpuid input value.  */
  __cpuid (__ext, __eax, __ebx, __ecx, __edx);

  if (__sig)
    *__sig = __ebx;

  return __eax;
}

/* Return cpuid data for requested cpuid level, as found in returned
   eax, ebx, ecx and edx registers.  The function checks if cpuid is
   supported and returns 1 for valid cpuid information or 0 for
   unsupported cpuid level.  All pointers are required to be non-null.  */

static __inline int
__get_cpuid (unsigned int __level,
             unsigned int *__eax, unsigned int *__ebx,
             unsigned int *__ecx, unsigned int *__edx)
{
  unsigned int __ext = __level & 0x80000000;

  if (__get_cpuid_max (__ext, 0) < __level)
    return 0;

  __cpuid (__level, *__eax, *__ebx, *__ecx, *__edx);
  return 1;
}