summaryrefslogtreecommitdiff
path: root/src/mesa/x86/common_x86.c
blob: ac77c9d77433e0fa937e59621142089e8725a7f0 (plain)
1
2
3
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
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
/*
 * Mesa 3-D graphics library
 *
 * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * \file common_x86.c
 *
 * Check CPU capabilities & initialize optimized funtions for this particular
 * processor.
 *
 * Changed by Andre Werthmann for using the new SSE functions.
 *
 * \author Holger Waechtler <holger@akaflieg.extern.tu-berlin.de>
 * \author Andre Werthmann <wertmann@cs.uni-potsdam.de>
 */

/* XXX these includes should probably go into imports.h or glheader.h */
#if defined(USE_SSE_ASM) && defined(__linux__)
#include <linux/version.h>
#endif
#if defined(USE_SSE_ASM) && defined(__FreeBSD__)
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
#if defined(USE_SSE_ASM) && defined(__OpenBSD__)
#include <sys/param.h>
#include <sys/sysctl.h>
#include <machine/cpu.h>
#endif
#if defined(USE_X86_64_ASM)
#include <cpuid.h>
#endif

#include "main/imports.h"
#include "common_x86_asm.h"


/** Bitmask of X86_FEATURE_x bits */
int _mesa_x86_cpu_features = 0x0;

static int detection_debug = GL_FALSE;

/* No reason for this to be public.
 */
extern GLuint	_ASMAPI _mesa_x86_has_cpuid(void);
extern void	_ASMAPI _mesa_x86_cpuid(GLuint op, GLuint *reg_eax, GLuint *reg_ebx, GLuint *reg_ecx, GLuint *reg_edx);
extern GLuint	_ASMAPI _mesa_x86_cpuid_eax(GLuint op);
extern GLuint	_ASMAPI _mesa_x86_cpuid_ebx(GLuint op);
extern GLuint	_ASMAPI _mesa_x86_cpuid_ecx(GLuint op);
extern GLuint	_ASMAPI _mesa_x86_cpuid_edx(GLuint op);


#if defined(USE_SSE_ASM)
/*
 * We must verify that the Streaming SIMD Extensions are truly supported
 * on this processor before we go ahead and hook out the optimized code.
 *
 * However, I have been told by Alan Cox that all 2.4 (and later) Linux
 * kernels provide full SSE support on all processors that expose SSE via
 * the CPUID mechanism.
 */

/* These are assembly functions: */
extern void _mesa_test_os_sse_support( void );
extern void _mesa_test_os_sse_exception_support( void );


#if defined(_WIN32)
#ifndef STATUS_FLOAT_MULTIPLE_TRAPS
# define STATUS_FLOAT_MULTIPLE_TRAPS (0xC00002B5L)
#endif
static LONG WINAPI ExceptionFilter(LPEXCEPTION_POINTERS exp)
{
   PEXCEPTION_RECORD rec = exp->ExceptionRecord;
   PCONTEXT ctx = exp->ContextRecord;

   if ( rec->ExceptionCode == EXCEPTION_ILLEGAL_INSTRUCTION ) {
      _mesa_debug(NULL, "EXCEPTION_ILLEGAL_INSTRUCTION\n" );
      _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
   } else if ( rec->ExceptionCode == STATUS_FLOAT_MULTIPLE_TRAPS ) {
      _mesa_debug(NULL, "STATUS_FLOAT_MULTIPLE_TRAPS\n");
      /* Windows seems to clear the exception flag itself, we just have to increment Eip */
   } else {
      _mesa_debug(NULL, "UNEXPECTED EXCEPTION (0x%08x), terminating!\n" );
      return EXCEPTION_EXECUTE_HANDLER;
   }

   if ( (ctx->ContextFlags & CONTEXT_CONTROL) != CONTEXT_CONTROL ) {
      _mesa_debug(NULL, "Context does not contain control registers, terminating!\n");
      return EXCEPTION_EXECUTE_HANDLER;
   }
   ctx->Eip += 3;

   return EXCEPTION_CONTINUE_EXECUTION;
}
#endif /* _WIN32 */


/**
 * Check if SSE is supported.
 * If not, turn off the X86_FEATURE_XMM flag in _mesa_x86_cpu_features.
 */
void _mesa_check_os_sse_support( void )
{
#if defined(__FreeBSD__)
   {
      int ret, enabled;
      unsigned int len;
      len = sizeof(enabled);
      ret = sysctlbyname("hw.instruction_sse", &enabled, &len, NULL, 0);
      if (ret || !enabled)
         _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
   }
#elif defined (__NetBSD__)
   {
      int ret, enabled;
      size_t len = sizeof(enabled);
      ret = sysctlbyname("machdep.sse", &enabled, &len, (void *)NULL, 0);
      if (ret || !enabled)
         _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
   }
#elif defined(__OpenBSD__)
   {
      int mib[2];
      int ret, enabled;
      size_t len = sizeof(enabled);

      mib[0] = CTL_MACHDEP;
      mib[1] = CPU_SSE;

      ret = sysctl(mib, 2, &enabled, &len, NULL, 0);
      if (ret || !enabled)
         _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
   }
#elif defined(_WIN32)
   LPTOP_LEVEL_EXCEPTION_FILTER oldFilter;
   
   /* Install our ExceptionFilter */
   oldFilter = SetUnhandledExceptionFilter( ExceptionFilter );
   
   if ( cpu_has_xmm ) {
      _mesa_debug(NULL, "Testing OS support for SSE...\n");

      _mesa_test_os_sse_support();

      if ( cpu_has_xmm ) {
	 _mesa_debug(NULL, "Yes.\n");
      } else {
	 _mesa_debug(NULL, "No!\n");
      }
   }

   if ( cpu_has_xmm ) {
      _mesa_debug(NULL, "Testing OS support for SSE unmasked exceptions...\n");

      _mesa_test_os_sse_exception_support();

      if ( cpu_has_xmm ) {
	 _mesa_debug(NULL, "Yes.\n");
      } else {
	 _mesa_debug(NULL, "No!\n");
      }
   }

   /* Restore previous exception filter */
   SetUnhandledExceptionFilter( oldFilter );

   if ( cpu_has_xmm ) {
      _mesa_debug(NULL, "Tests of OS support for SSE passed.\n");
   } else {
      _mesa_debug(NULL, "Tests of OS support for SSE failed!\n");
   }
#else
   /* Do nothing on other platforms for now.
    */
   if (detection_debug)
      _mesa_debug(NULL, "Not testing OS support for SSE, leaving enabled.\n");
#endif /* __FreeBSD__ */
}

#endif /* USE_SSE_ASM */


/**
 * Initialize the _mesa_x86_cpu_features bitfield.
 * This is a no-op if called more than once.
 */
void
_mesa_get_x86_features(void)
{
   static int called = 0;

   if (called)
      return;

   called = 1;

#ifdef USE_X86_ASM
   _mesa_x86_cpu_features = 0x0;

   if (_mesa_getenv( "MESA_NO_ASM")) {
      return;
   }

   if (!_mesa_x86_has_cpuid()) {
       _mesa_debug(NULL, "CPUID not detected\n");
   }
   else {
       GLuint cpu_features, cpu_features_ecx;
       GLuint cpu_ext_features;
       GLuint cpu_ext_info;
       char cpu_vendor[13];
       GLuint result;

       /* get vendor name */
       _mesa_x86_cpuid(0, &result, (GLuint *)(cpu_vendor + 0), (GLuint *)(cpu_vendor + 8), (GLuint *)(cpu_vendor + 4));
       cpu_vendor[12] = '\0';

       if (detection_debug)
	  _mesa_debug(NULL, "CPU vendor: %s\n", cpu_vendor);

       /* get cpu features */
       cpu_features = _mesa_x86_cpuid_edx(1);
       cpu_features_ecx = _mesa_x86_cpuid_ecx(1);

       if (cpu_features & X86_CPU_FPU)
	   _mesa_x86_cpu_features |= X86_FEATURE_FPU;
       if (cpu_features & X86_CPU_CMOV)
	   _mesa_x86_cpu_features |= X86_FEATURE_CMOV;

#ifdef USE_MMX_ASM
       if (cpu_features & X86_CPU_MMX)
	   _mesa_x86_cpu_features |= X86_FEATURE_MMX;
#endif

#ifdef USE_SSE_ASM
       if (cpu_features & X86_CPU_XMM)
	   _mesa_x86_cpu_features |= X86_FEATURE_XMM;
       if (cpu_features & X86_CPU_XMM2)
	   _mesa_x86_cpu_features |= X86_FEATURE_XMM2;
       if (cpu_features_ecx & X86_CPU_SSE4_1)
	   _mesa_x86_cpu_features |= X86_FEATURE_SSE4_1;
#endif

       /* query extended cpu features */
       if ((cpu_ext_info = _mesa_x86_cpuid_eax(0x80000000)) > 0x80000000) {
	   if (cpu_ext_info >= 0x80000001) {

	       cpu_ext_features = _mesa_x86_cpuid_edx(0x80000001);

	       if (cpu_features & X86_CPU_MMX) {

#ifdef USE_3DNOW_ASM
		   if (cpu_ext_features & X86_CPUEXT_3DNOW)
		       _mesa_x86_cpu_features |= X86_FEATURE_3DNOW;
		   if (cpu_ext_features & X86_CPUEXT_3DNOW_EXT)
		       _mesa_x86_cpu_features |= X86_FEATURE_3DNOWEXT;
#endif

#ifdef USE_MMX_ASM
		   if (cpu_ext_features & X86_CPUEXT_MMX_EXT)
		       _mesa_x86_cpu_features |= X86_FEATURE_MMXEXT;
#endif
	       }
	   }

	   /* query cpu name */
	   if (cpu_ext_info >= 0x80000002) {
	       GLuint ofs;
	       char cpu_name[49];
	       for (ofs = 0; ofs < 3; ofs++)
		   _mesa_x86_cpuid(0x80000002+ofs, (GLuint *)(cpu_name + (16*ofs)+0), (GLuint *)(cpu_name + (16*ofs)+4), (GLuint *)(cpu_name + (16*ofs)+8), (GLuint *)(cpu_name + (16*ofs)+12));
	       cpu_name[48] = '\0'; /* the name should be NULL terminated, but just to be sure */

	       if (detection_debug)
		  _mesa_debug(NULL, "CPU name: %s\n", cpu_name);
	   }
       }

   }

#ifdef USE_MMX_ASM
   if ( cpu_has_mmx ) {
      if ( _mesa_getenv( "MESA_NO_MMX" ) == 0 ) {
	 if (detection_debug)
	    _mesa_debug(NULL, "MMX cpu detected.\n");
      } else {
         _mesa_x86_cpu_features &= ~(X86_FEATURE_MMX);
      }
   }
#endif

#ifdef USE_3DNOW_ASM
   if ( cpu_has_3dnow ) {
      if ( _mesa_getenv( "MESA_NO_3DNOW" ) == 0 ) {
	 if (detection_debug)
	    _mesa_debug(NULL, "3DNow! cpu detected.\n");
      } else {
         _mesa_x86_cpu_features &= ~(X86_FEATURE_3DNOW);
      }
   }
#endif

#ifdef USE_SSE_ASM
   if ( cpu_has_xmm ) {
      if ( _mesa_getenv( "MESA_NO_SSE" ) == 0 ) {
	 if (detection_debug)
	    _mesa_debug(NULL, "SSE cpu detected.\n");
         if ( _mesa_getenv( "MESA_FORCE_SSE" ) == 0 ) {
            _mesa_check_os_sse_support();
         }
      } else {
         _mesa_debug(NULL, "SSE cpu detected, but switched off by user.\n");
         _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
      }
   }
#endif

#elif defined(USE_X86_64_ASM)
   unsigned int uninitialized_var(eax), uninitialized_var(ebx),
                uninitialized_var(ecx), uninitialized_var(edx);

   /* Always available on x86-64. */
   _mesa_x86_cpu_features |= X86_FEATURE_XMM | X86_FEATURE_XMM2;

   __get_cpuid(1, &eax, &ebx, &ecx, &edx);

   if (ecx & bit_SSE4_1)
      _mesa_x86_cpu_features |= X86_FEATURE_SSE4_1;
#endif /* USE_X86_64_ASM */

   (void) detection_debug;
}