/
SDL_cpuinfo.c
369 lines (333 loc) · 9.63 KB
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2004 Sam Lantinga
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
/* CPU feature detection for SDL */
30
31
32
33
34
35
#ifdef unix /* FIXME: Better setjmp detection? */
#define USE_SETJMP
#include <signal.h>
#include <setjmp.h>
#endif
36
#include "SDL.h"
37
#include "SDL_cpuinfo.h"
38
39
40
41
42
#ifdef MACOSX
#include <sys/sysctl.h> /* For AltiVec check */
#endif
43
44
#define CPU_HAS_RDTSC 0x00000001
#define CPU_HAS_MMX 0x00000002
45
46
47
48
49
50
#define CPU_HAS_MMXEXT 0x00000004
#define CPU_HAS_3DNOW 0x00000010
#define CPU_HAS_3DNOWEXT 0x00000020
#define CPU_HAS_SSE 0x00000040
#define CPU_HAS_SSE2 0x00000080
#define CPU_HAS_ALTIVEC 0x00000100
51
52
53
54
55
56
57
58
59
60
61
62
#ifdef USE_SETJMP
/* This is the brute force way of detecting instruction sets...
the idea is borrowed from the libmpeg2 library - thanks!
*/
static jmp_buf jmpbuf;
static void illegal_instruction(int sig)
{
longjmp(jmpbuf, 1);
}
#endif // USE_SETJMP
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
static __inline__ int CPU_haveCPUID()
{
int has_CPUID = 0;
#if defined(__GNUC__) && defined(i386)
__asm__ (
" pushfl # Get original EFLAGS \n"
" popl %%eax \n"
" movl %%eax,%%ecx \n"
" xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n"
" pushl %%eax # Save new EFLAGS value on stack \n"
" popfl # Replace current EFLAGS value \n"
" pushfl # Get new EFLAGS \n"
" popl %%eax # Store new EFLAGS in EAX \n"
" xorl %%ecx,%%eax # Can not toggle ID bit, \n"
" jz 1f # Processor=80486 \n"
" movl $1,%0 # We have CPUID support \n"
"1: \n"
80
: "=m" (has_CPUID)
81
82
83
84
:
: "%eax", "%ecx"
);
#elif defined(_MSC_VER)
85
__asm {
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
pushfd ; Get original EFLAGS
pop eax
mov ecx, eax
xor eax, 200000h ; Flip ID bit in EFLAGS
push eax ; Save new EFLAGS value on stack
popfd ; Replace current EFLAGS value
pushfd ; Get new EFLAGS
pop eax ; Store new EFLAGS in EAX
xor eax, ecx ; Can not toggle ID bit,
jz done ; Processor=80486
mov has_CPUID,1 ; We have CPUID support
done:
}
#endif
return has_CPUID;
}
static __inline__ int CPU_getCPUIDFeatures()
{
int features = 0;
#if defined(__GNUC__) && defined(i386)
__asm__ (
108
" movl %%ebx,%%edi\n"
109
110
111
112
113
114
115
116
117
" xorl %%eax,%%eax # Set up for CPUID instruction \n"
" cpuid # Get and save vendor ID \n"
" cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n"
" jl 1f # We dont have the CPUID instruction\n"
" xorl %%eax,%%eax \n"
" incl %%eax \n"
" cpuid # Get family/model/stepping/features\n"
" movl %%edx,%0 \n"
"1: \n"
118
" movl %%edi,%%ebx\n"
119
: "=m" (features)
120
:
121
: "%eax", "%ebx", "%ecx", "%edx", "%edi"
122
123
);
#elif defined(_MSC_VER)
124
__asm {
125
126
127
128
129
130
131
132
133
134
135
136
137
138
xor eax, eax ; Set up for CPUID instruction
cpuid ; Get and save vendor ID
cmp eax, 1 ; Make sure 1 is valid input for CPUID
jl done ; We dont have the CPUID instruction
xor eax, eax
inc eax
cpuid ; Get family/model/stepping/features
mov features, edx
done:
}
#endif
return features;
}
139
static __inline__ int CPU_getCPUIDFeaturesExt()
140
{
141
int features = 0;
142
143
#if defined(__GNUC__) && defined(i386)
__asm__ (
144
" movl %%ebx,%%edi\n"
145
146
147
" movl $0x80000000,%%eax # Query for extended functions \n"
" cpuid # Get extended function limit \n"
" cmpl $0x80000001,%%eax \n"
148
" jl 1f # Nope, we dont have function 800000001h\n"
149
150
" movl $0x80000001,%%eax # Setup extended function 800000001h\n"
" cpuid # and get the information \n"
151
" movl %%edx,%0 \n"
152
"1: \n"
153
154
" movl %%edi,%%ebx\n"
: "=m" (features)
155
:
156
: "%eax", "%ebx", "%ecx", "%edx", "%edi"
157
158
);
#elif defined(_MSC_VER)
159
__asm {
160
161
162
mov eax,80000000h ; Query for extended functions
cpuid ; Get extended function limit
cmp eax,80000001h
163
jl done ; Nope, we dont have function 800000001h
164
165
mov eax,80000001h ; Setup extended function 800000001h
cpuid ; and get the information
166
mov features,edx
167
168
169
done:
}
#endif
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
return features;
}
static __inline__ int CPU_haveRDTSC()
{
if ( CPU_haveCPUID() ) {
return (CPU_getCPUIDFeatures() & 0x00000010);
}
return 0;
}
static __inline__ int CPU_haveMMX()
{
if ( CPU_haveCPUID() ) {
return (CPU_getCPUIDFeatures() & 0x00800000);
}
return 0;
}
static __inline__ int CPU_haveMMXExt()
{
if ( CPU_haveCPUID() ) {
return (CPU_getCPUIDFeaturesExt() & 0x00400000);
}
return 0;
}
static __inline__ int CPU_have3DNow()
{
if ( CPU_haveCPUID() ) {
return (CPU_getCPUIDFeaturesExt() & 0x80000000);
}
return 0;
}
static __inline__ int CPU_have3DNowExt()
{
if ( CPU_haveCPUID() ) {
return (CPU_getCPUIDFeaturesExt() & 0x40000000);
}
return 0;
211
212
213
214
215
216
217
218
219
}
static __inline__ int CPU_haveSSE()
{
if ( CPU_haveCPUID() ) {
return (CPU_getCPUIDFeatures() & 0x02000000);
}
return 0;
}
220
221
222
223
224
225
226
227
228
static __inline__ int CPU_haveSSE2()
{
if ( CPU_haveCPUID() ) {
return (CPU_getCPUIDFeatures() & 0x04000000);
}
return 0;
}
229
230
static __inline__ int CPU_haveAltiVec()
{
231
volatile int altivec = 0;
232
233
234
235
236
237
#ifdef MACOSX
int selectors[2] = { CTL_HW, HW_VECTORUNIT };
int hasVectorUnit = 0;
size_t length = sizeof(hasVectorUnit);
int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
if( 0 == error )
238
altivec = (hasVectorUnit != 0);
239
#elif defined(USE_SETJMP) && defined(GCC_ALTIVEC)
240
241
242
243
244
245
246
247
248
249
void (*handler)(int sig);
handler = signal(SIGILL, illegal_instruction);
if ( setjmp(jmpbuf) == 0 ) {
asm volatile ("mtspr 256, %0\n\t"
"vand %%v0, %%v0, %%v0"
:
: "r" (-1));
altivec = 1;
}
signal(SIGILL, handler);
250
#endif
251
return altivec;
252
253
}
254
255
256
257
258
259
static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;
static Uint32 SDL_GetCPUFeatures()
{
if ( SDL_CPUFeatures == 0xFFFFFFFF ) {
SDL_CPUFeatures = 0;
260
261
262
if ( CPU_haveRDTSC() ) {
SDL_CPUFeatures |= CPU_HAS_RDTSC;
}
263
264
265
if ( CPU_haveMMX() ) {
SDL_CPUFeatures |= CPU_HAS_MMX;
}
266
267
268
if ( CPU_haveMMXExt() ) {
SDL_CPUFeatures |= CPU_HAS_MMXEXT;
}
269
270
271
if ( CPU_have3DNow() ) {
SDL_CPUFeatures |= CPU_HAS_3DNOW;
}
272
273
274
if ( CPU_have3DNowExt() ) {
SDL_CPUFeatures |= CPU_HAS_3DNOWEXT;
}
275
276
277
if ( CPU_haveSSE() ) {
SDL_CPUFeatures |= CPU_HAS_SSE;
}
278
279
280
if ( CPU_haveSSE2() ) {
SDL_CPUFeatures |= CPU_HAS_SSE2;
}
281
282
283
if ( CPU_haveAltiVec() ) {
SDL_CPUFeatures |= CPU_HAS_ALTIVEC;
}
284
285
286
287
}
return SDL_CPUFeatures;
}
288
289
290
291
292
293
294
295
SDL_bool SDL_HasRDTSC()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_RDTSC ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
SDL_bool SDL_HasMMX()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_MMX ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
SDL_bool SDL_Has3DNow()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOW ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
SDL_bool SDL_HasSSE()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_SSE ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
320
321
322
323
324
325
326
327
SDL_bool SDL_HasAltiVec()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_ALTIVEC ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
SDL_bool SDL_HasMMXExt()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_MMXEXT ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
SDL_bool SDL_Has3DNowExt()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOWEXT ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
SDL_bool SDL_HasSSE2()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_SSE2 ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
352
353
354
355
356
357
#ifdef TEST_MAIN
#include <stdio.h>
int main()
{
358
printf("RDTSC: %d\n", SDL_HasRDTSC());
359
printf("MMX: %d\n", SDL_HasMMX());
360
printf("MMXExt: %d\n", SDL_HasMMXExt());
361
printf("3DNow: %d\n", SDL_Has3DNow());
362
printf("3DNowExt: %d\n", SDL_Has3DNowExt());
363
printf("SSE: %d\n", SDL_HasSSE());
364
printf("SSE2: %d\n", SDL_HasSSE2());
365
printf("AltiVec: %d\n", SDL_HasAltiVec());
366
return 0;
367
368
369
}
#endif /* TEST_MAIN */