src/mesa/x86/common_x86.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file common_x86.c
  27  *
  28  * Check CPU capabilities & initialize optimized funtions for this particular
  29  * processor.
  30  *
  31  * Changed by Andre Werthmann for using the new SSE functions.
  32  *
  33  * \author Holger Waechtler <holger@akaflieg.extern.tu-berlin.de>
  34  * \author Andre Werthmann <wertmann@cs.uni-potsdam.de>
  35  */
  36
  37 /* XXX these includes should probably go into imports.h or glheader.h */
  38 #if defined(USE_SSE_ASM) && defined(__FreeBSD__)
  39 #include <sys/types.h>
  40 #include <sys/sysctl.h>
  41 #endif
  42 #if defined(USE_SSE_ASM) && (defined(__OpenBSD__) || defined(__NetBSD__))
  43 #include <sys/param.h>
  44 #include <sys/sysctl.h>
  45 #include <machine/cpu.h>
  46 #endif
  47 #if defined(USE_X86_64_ASM)
  48 #include <cpuid.h>
  49 #if !defined(bit_SSE4_1) && defined(bit_SSE41)
  50 /* XXX: clang defines bit_SSE41 instead of bit_SSE4_1 */
  51 #define bit_SSE4_1 bit_SSE41
  52 #elif !defined(bit_SSE4_1) && !defined(bit_SSE41)
  53 #define bit_SSE4_1 0x00080000
  54 #endif
  55 #endif
  56
  57 #include "main/errors.h"
  58 #include "util/imports.h"
  59 #include "common_x86_asm.h"
  60
  61
  62 /** Bitmask of X86_FEATURE_x bits */
  63 int _mesa_x86_cpu_features = 0x0;
  64
  65 static int detection_debug = GL_FALSE;
  66
  67 /* No reason for this to be public.
  68  */
  69 extern GLuint _mesa_x86_has_cpuid(void);
  70 extern void _mesa_x86_cpuid(GLuint op, GLuint *reg_eax, GLuint *reg_ebx, GLuint *reg_ecx, GLuint *reg_edx);
  71 extern GLuint _mesa_x86_cpuid_eax(GLuint op);
  72 extern GLuint _mesa_x86_cpuid_ebx(GLuint op);
  73 extern GLuint _mesa_x86_cpuid_ecx(GLuint op);
  74 extern GLuint _mesa_x86_cpuid_edx(GLuint op);
  75
  76
  77 #if defined(USE_SSE_ASM)
  78 /*
  79  * We must verify that the Streaming SIMD Extensions are truly supported
  80  * on this processor before we go ahead and hook out the optimized code.
  81  *
  82  * However, I have been told by Alan Cox that all 2.4 (and later) Linux
  83  * kernels provide full SSE support on all processors that expose SSE via
  84  * the CPUID mechanism.
  85  */
  86
  87 /* These are assembly functions: */
  88 extern void _mesa_test_os_sse_support( void );
  89 extern void _mesa_test_os_sse_exception_support( void );
  90
  91
  92 #if defined(_WIN32)
  93 #ifndef STATUS_FLOAT_MULTIPLE_TRAPS
  94 # define STATUS_FLOAT_MULTIPLE_TRAPS (0xC00002B5L)
  95 #endif
  96 static LONG WINAPI ExceptionFilter(LPEXCEPTION_POINTERS exp)
  97 {
  98    PEXCEPTION_RECORD rec = exp->ExceptionRecord;
  99    PCONTEXT ctx = exp->ContextRecord;
 100
 101    if ( rec->ExceptionCode == EXCEPTION_ILLEGAL_INSTRUCTION ) {
 102       _mesa_debug(NULL, "EXCEPTION_ILLEGAL_INSTRUCTION\n" );
 103       _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 104    } else if ( rec->ExceptionCode == STATUS_FLOAT_MULTIPLE_TRAPS ) {
 105       _mesa_debug(NULL, "STATUS_FLOAT_MULTIPLE_TRAPS\n");
 106       /* Windows seems to clear the exception flag itself, we just have to increment Eip */
 107    } else {
 108       _mesa_debug(NULL, "UNEXPECTED EXCEPTION (0x%08x), terminating!\n" );
 109       return EXCEPTION_EXECUTE_HANDLER;
 110    }
 111
 112    if ( (ctx->ContextFlags & CONTEXT_CONTROL) != CONTEXT_CONTROL ) {
 113       _mesa_debug(NULL, "Context does not contain control registers, terminating!\n");
 114       return EXCEPTION_EXECUTE_HANDLER;
 115    }
 116    ctx->Eip += 3;
 117
 118    return EXCEPTION_CONTINUE_EXECUTION;
 119 }
 120 #endif /* _WIN32 */
 121
 122
 123 /**
 124  * Check if SSE is supported.
 125  * If not, turn off the X86_FEATURE_XMM flag in _mesa_x86_cpu_features.
 126  */
 127 void _mesa_check_os_sse_support( void )
 128 {
 129 #if defined(__FreeBSD__)
 130    {
 131       int ret, enabled;
 132       unsigned int len;
 133       len = sizeof(enabled);
 134       ret = sysctlbyname("hw.instruction_sse", &enabled, &len, NULL, 0);
 135       if (ret || !enabled)
 136          _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 137    }
 138 #elif defined (__NetBSD__)
 139    {
 140       int ret, enabled;
 141       size_t len = sizeof(enabled);
 142       ret = sysctlbyname("machdep.sse", &enabled, &len, (void *)NULL, 0);
 143       if (ret || !enabled)
 144          _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 145    }
 146 #elif defined(__OpenBSD__)
 147    {
 148       int mib[2];
 149       int ret, enabled;
 150       size_t len = sizeof(enabled);
 151
 152       mib[0] = CTL_MACHDEP;
 153       mib[1] = CPU_SSE;
 154
 155       ret = sysctl(mib, 2, &enabled, &len, NULL, 0);
 156       if (ret || !enabled)
 157          _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 158    }
 159 #elif defined(_WIN32)
 160    LPTOP_LEVEL_EXCEPTION_FILTER oldFilter;
 161
 162    /* Install our ExceptionFilter */
 163    oldFilter = SetUnhandledExceptionFilter( ExceptionFilter );
 164
 165    if ( cpu_has_xmm ) {
 166       _mesa_debug(NULL, "Testing OS support for SSE...\n");
 167
 168       _mesa_test_os_sse_support();
 169
 170       if ( cpu_has_xmm ) {
 171          _mesa_debug(NULL, "Yes.\n");
 172       } else {
 173          _mesa_debug(NULL, "No!\n");
 174       }
 175    }
 176
 177    if ( cpu_has_xmm ) {
 178       _mesa_debug(NULL, "Testing OS support for SSE unmasked exceptions...\n");
 179
 180       _mesa_test_os_sse_exception_support();
 181
 182       if ( cpu_has_xmm ) {
 183          _mesa_debug(NULL, "Yes.\n");
 184       } else {
 185          _mesa_debug(NULL, "No!\n");
 186       }
 187    }
 188
 189    /* Restore previous exception filter */
 190    SetUnhandledExceptionFilter( oldFilter );
 191
 192    if ( cpu_has_xmm ) {
 193       _mesa_debug(NULL, "Tests of OS support for SSE passed.\n");
 194    } else {
 195       _mesa_debug(NULL, "Tests of OS support for SSE failed!\n");
 196    }
 197 #else
 198    /* Do nothing on other platforms for now.
 199     */
 200    if (detection_debug)
 201       _mesa_debug(NULL, "Not testing OS support for SSE, leaving enabled.\n");
 202 #endif /* __FreeBSD__ */
 203 }
 204
 205 #endif /* USE_SSE_ASM */
 206
 207
 208 /**
 209  * Initialize the _mesa_x86_cpu_features bitfield.
 210  * This is a no-op if called more than once.
 211  */
 212 void
 213 _mesa_get_x86_features(void)
 214 {
 215    static int called = 0;
 216
 217    if (called)
 218       return;
 219
 220    called = 1;
 221
 222 #ifdef USE_X86_ASM
 223    _mesa_x86_cpu_features = 0x0;
 224
 225    if (getenv( "MESA_NO_ASM")) {
 226       return;
 227    }
 228
 229    if (!_mesa_x86_has_cpuid()) {
 230        _mesa_debug(NULL, "CPUID not detected\n");
 231    }
 232    else {
 233        GLuint cpu_features, cpu_features_ecx;
 234        GLuint cpu_ext_features;
 235        GLuint cpu_ext_info;
 236        char cpu_vendor[13];
 237        GLuint result;
 238
 239        /* get vendor name */
 240        _mesa_x86_cpuid(0, &result, (GLuint *)(cpu_vendor + 0), (GLuint *)(cpu_vendor + 8), (GLuint *)(cpu_vendor + 4));
 241        cpu_vendor[12] = '\0';
 242
 243        if (detection_debug)
 244           _mesa_debug(NULL, "CPU vendor: %s\n", cpu_vendor);
 245
 246        /* get cpu features */
 247        cpu_features = _mesa_x86_cpuid_edx(1);
 248        cpu_features_ecx = _mesa_x86_cpuid_ecx(1);
 249
 250        if (cpu_features & X86_CPU_FPU)
 251            _mesa_x86_cpu_features |= X86_FEATURE_FPU;
 252        if (cpu_features & X86_CPU_CMOV)
 253            _mesa_x86_cpu_features |= X86_FEATURE_CMOV;
 254
 255 #ifdef USE_MMX_ASM
 256        if (cpu_features & X86_CPU_MMX)
 257            _mesa_x86_cpu_features |= X86_FEATURE_MMX;
 258 #endif
 259
 260 #ifdef USE_SSE_ASM
 261        if (cpu_features & X86_CPU_XMM)
 262            _mesa_x86_cpu_features |= X86_FEATURE_XMM;
 263        if (cpu_features & X86_CPU_XMM2)
 264            _mesa_x86_cpu_features |= X86_FEATURE_XMM2;
 265        if (cpu_features_ecx & X86_CPU_SSE4_1)
 266            _mesa_x86_cpu_features |= X86_FEATURE_SSE4_1;
 267 #endif
 268
 269        /* query extended cpu features */
 270        if ((cpu_ext_info = _mesa_x86_cpuid_eax(0x80000000)) > 0x80000000) {
 271            if (cpu_ext_info >= 0x80000001) {
 272
 273                cpu_ext_features = _mesa_x86_cpuid_edx(0x80000001);
 274
 275                if (cpu_features & X86_CPU_MMX) {
 276
 277 #ifdef USE_3DNOW_ASM
 278                    if (cpu_ext_features & X86_CPUEXT_3DNOW)
 279                        _mesa_x86_cpu_features |= X86_FEATURE_3DNOW;
 280                    if (cpu_ext_features & X86_CPUEXT_3DNOW_EXT)
 281                        _mesa_x86_cpu_features |= X86_FEATURE_3DNOWEXT;
 282 #endif
 283
 284 #ifdef USE_MMX_ASM
 285                    if (cpu_ext_features & X86_CPUEXT_MMX_EXT)
 286                        _mesa_x86_cpu_features |= X86_FEATURE_MMXEXT;
 287 #endif
 288                }
 289            }
 290
 291            /* query cpu name */
 292            if (cpu_ext_info >= 0x80000002) {
 293                GLuint ofs;
 294                char cpu_name[49];
 295                for (ofs = 0; ofs < 3; ofs++)
 296                    _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));
 297                cpu_name[48] = '\0'; /* the name should be NULL terminated, but just to be sure */
 298
 299                if (detection_debug)
 300                   _mesa_debug(NULL, "CPU name: %s\n", cpu_name);
 301            }
 302        }
 303
 304    }
 305
 306 #ifdef USE_MMX_ASM
 307    if ( cpu_has_mmx ) {
 308       if ( getenv( "MESA_NO_MMX" ) == 0 ) {
 309          if (detection_debug)
 310             _mesa_debug(NULL, "MMX cpu detected.\n");
 311       } else {
 312          _mesa_x86_cpu_features &= ~(X86_FEATURE_MMX);
 313       }
 314    }
 315 #endif
 316
 317 #ifdef USE_3DNOW_ASM
 318    if ( cpu_has_3dnow ) {
 319       if ( getenv( "MESA_NO_3DNOW" ) == 0 ) {
 320          if (detection_debug)
 321             _mesa_debug(NULL, "3DNow! cpu detected.\n");
 322       } else {
 323          _mesa_x86_cpu_features &= ~(X86_FEATURE_3DNOW);
 324       }
 325    }
 326 #endif
 327
 328 #ifdef USE_SSE_ASM
 329    if ( cpu_has_xmm ) {
 330       if ( getenv( "MESA_NO_SSE" ) == 0 ) {
 331          if (detection_debug)
 332             _mesa_debug(NULL, "SSE cpu detected.\n");
 333          if ( getenv( "MESA_FORCE_SSE" ) == 0 ) {
 334             _mesa_check_os_sse_support();
 335          }
 336       } else {
 337          _mesa_debug(NULL, "SSE cpu detected, but switched off by user.\n");
 338          _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 339       }
 340    }
 341 #endif
 342
 343 #elif defined(USE_X86_64_ASM)
 344    {
 345       unsigned int eax, ebx, ecx, edx;
 346
 347       /* Always available on x86-64. */
 348       _mesa_x86_cpu_features |= X86_FEATURE_XMM | X86_FEATURE_XMM2;
 349
 350       if (!__get_cpuid(1, &eax, &ebx, &ecx, &edx))
 351          return;
 352
 353       if (ecx & bit_SSE4_1)
 354          _mesa_x86_cpu_features |= X86_FEATURE_SSE4_1;
 355    }
 356 #endif /* USE_X86_64_ASM */
 357
 358    (void) detection_debug;
 359 }