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2 * Copyright (C) 2007, 2008 Free Software Foundation, Inc.
4 * This file is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2, or (at your option) any
9 * In addition to the permissions in the GNU General Public License, the
10 * Free Software Foundation gives you unlimited permission to link the
11 * compiled version of this file with other programs, and to distribute
12 * those programs without any restriction coming from the use of this
13 * file. (The General Public License restrictions do apply in other
14 * respects; for example, they cover modification of the file, and
15 * distribution when not linked into another program.)
17 * This file is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
25 * Boston, MA 02110-1301, USA.
27 * As a special exception, if you link this library with files
28 * compiled with GCC to produce an executable, this does not cause
29 * the resulting executable to be covered by the GNU General Public License.
30 * This exception does not however invalidate any other reasons why
31 * the executable file might be covered by the GNU General Public License.
35 #define bit_SSE3 (1 << 0)
36 #define bit_PCLMUL (1 << 1)
37 #define bit_SSSE3 (1 << 9)
38 #define bit_FMA (1 << 12)
39 #define bit_CMPXCHG16B (1 << 13)
40 #define bit_SSE4_1 (1 << 19)
41 #define bit_SSE4_2 (1 << 20)
42 #define bit_POPCNT (1 << 23)
43 #define bit_AES (1 << 25)
44 #define bit_XSAVE (1 << 26)
45 #define bit_OSXSAVE (1 << 27)
46 #define bit_AVX (1 << 28)
49 #define bit_CMPXCHG8B (1 << 8)
50 #define bit_CMOV (1 << 15)
51 #define bit_MMX (1 << 23)
52 #define bit_FXSAVE (1 << 24)
53 #define bit_SSE (1 << 25)
54 #define bit_SSE2 (1 << 26)
56 /* Extended Features */
58 #define bit_LAHF_LM (1 << 0)
59 #define bit_SSE4a (1 << 6)
60 #define bit_SSE5 (1 << 11)
63 #define bit_LM (1 << 29)
64 #define bit_3DNOWP (1 << 30)
65 #define bit_3DNOW (1 << 31)
68 #if defined(__i386__) && defined(__PIC__)
69 /* %ebx may be the PIC register. */
71 #define __cpuid(level, a, b, c, d) \
72 __asm__ ("xchg{l}\t{%%}ebx, %1\n\t" \
74 "xchg{l}\t{%%}ebx, %1\n\t" \
75 : "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
78 #define __cpuid_count(level, count, a, b, c, d) \
79 __asm__ ("xchg{l}\t{%%}ebx, %1\n\t" \
81 "xchg{l}\t{%%}ebx, %1\n\t" \
82 : "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
83 : "0" (level), "2" (count))
85 /* Host GCCs older than 3.0 weren't supporting Intel asm syntax
86 nor alternatives in i386 code. */
87 #define __cpuid(level, a, b, c, d) \
88 __asm__ ("xchgl\t%%ebx, %1\n\t" \
90 "xchgl\t%%ebx, %1\n\t" \
91 : "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
94 #define __cpuid_count(level, count, a, b, c, d) \
95 __asm__ ("xchgl\t%%ebx, %1\n\t" \
97 "xchgl\t%%ebx, %1\n\t" \
98 : "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
99 : "0" (level), "2" (count))
102 #define __cpuid(level, a, b, c, d) \
103 __asm__ ("cpuid\n\t" \
104 : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \
107 #define __cpuid_count(level, count, a, b, c, d) \
108 __asm__ ("cpuid\n\t" \
109 : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \
110 : "0" (level), "2" (count))
113 /* Return highest supported input value for cpuid instruction. ext can
114 be either 0x0 or 0x8000000 to return highest supported value for
115 basic or extended cpuid information. Function returns 0 if cpuid
116 is not supported or whatever cpuid returns in eax register. If sig
117 pointer is non-null, then first four bytes of the signature
118 (as found in ebx register) are returned in location pointed by sig. */
120 static __inline
unsigned int
121 __get_cpuid_max (unsigned int __ext
, unsigned int *__sig
)
123 unsigned int __eax
, __ebx
, __ecx
, __edx
;
127 /* See if we can use cpuid. On AMD64 we always can. */
128 __asm__ ("pushf{l|d}\n\t"
131 "mov{l}\t{%0, %1|%1, %0}\n\t"
132 "xor{l}\t{%2, %0|%0, %2}\n\t"
138 : "=&r" (__eax
), "=&r" (__ebx
)
141 /* Host GCCs older than 3.0 weren't supporting Intel asm syntax
142 nor alternatives in i386 code. */
143 __asm__ ("pushfl\n\t"
153 : "=&r" (__eax
), "=&r" (__ebx
)
157 if (!((__eax
^ __ebx
) & 0x00200000))
161 /* Host supports cpuid. Return highest supported cpuid input value. */
162 __cpuid (__ext
, __eax
, __ebx
, __ecx
, __edx
);
170 /* Return cpuid data for requested cpuid level, as found in returned
171 eax, ebx, ecx and edx registers. The function checks if cpuid is
172 supported and returns 1 for valid cpuid information or 0 for
173 unsupported cpuid level. All pointers are required to be non-null. */
176 __get_cpuid (unsigned int __level
,
177 unsigned int *__eax
, unsigned int *__ebx
,
178 unsigned int *__ecx
, unsigned int *__edx
)
180 unsigned int __ext
= __level
& 0x80000000;
182 if (__get_cpuid_max (__ext
, 0) < __level
)
185 __cpuid (__level
, *__eax
, *__ebx
, *__ecx
, *__edx
);