src/mesa/x86/common_x86.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.1
   4  *
   5  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR 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(__linux__)
  39 #include <linux/version.h>
  40 #endif
  41 #if defined(USE_SSE_ASM) && defined(__FreeBSD__)
  42 #include <sys/types.h>
  43 #include <sys/sysctl.h>
  44 #endif
  45
  46 #include "common_x86_asm.h"
  47 #include "imports.h"
  48
  49
  50 int _mesa_x86_cpu_features = 0;
  51
  52 /* No reason for this to be public.
  53  */
  54 extern GLuint   _ASMAPI _mesa_x86_has_cpuid(void);
  55 extern void     _ASMAPI _mesa_x86_cpuid(GLuint op, GLuint *reg_eax, GLuint *reg_ebx, GLuint *reg_ecx, GLuint *reg_edx);
  56 extern GLuint   _ASMAPI _mesa_x86_cpuid_eax(GLuint op);
  57 extern GLuint   _ASMAPI _mesa_x86_cpuid_ebx(GLuint op);
  58 extern GLuint   _ASMAPI _mesa_x86_cpuid_ecx(GLuint op);
  59 extern GLuint   _ASMAPI _mesa_x86_cpuid_edx(GLuint op);
  60
  61
  62 #if defined(USE_SSE_ASM)
  63 /*
  64  * We must verify that the Streaming SIMD Extensions are truly supported
  65  * on this processor before we go ahead and hook out the optimized code.
  66  *
  67  * However, I have been told by Alan Cox that all 2.4 (and later) Linux
  68  * kernels provide full SSE support on all processors that expose SSE via
  69  * the CPUID mechanism.
  70  */
  71 extern void _mesa_test_os_sse_support( void );
  72 extern void _mesa_test_os_sse_exception_support( void );
  73
  74 #if defined(WIN32)
  75 #ifndef STATUS_FLOAT_MULTIPLE_TRAPS
  76 # define STATUS_FLOAT_MULTIPLE_TRAPS (0xC00002B5L)
  77 #endif
  78 static LONG WINAPI ExceptionFilter(LPEXCEPTION_POINTERS exp)
  79 {
  80    PEXCEPTION_RECORD rec = exp->ExceptionRecord;
  81    PCONTEXT ctx = exp->ContextRecord;
  82
  83    if ( rec->ExceptionCode == EXCEPTION_ILLEGAL_INSTRUCTION ) {
  84       _mesa_debug(NULL, "EXCEPTION_ILLEGAL_INSTRUCTION\n" );
  85       _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
  86    } else if ( rec->ExceptionCode == STATUS_FLOAT_MULTIPLE_TRAPS ) {
  87       _mesa_debug(NULL, "STATUS_FLOAT_MULTIPLE_TRAPS\n");
  88       /* Windows seems to clear the exception flag itself, we just have to increment Eip */
  89    } else {
  90       _mesa_debug(NULL, "UNEXPECTED EXCEPTION (0x%08x), terminating!\n" );
  91       return EXCEPTION_EXECUTE_HANDLER;
  92    }
  93
  94    if ( (ctx->ContextFlags & CONTEXT_CONTROL) != CONTEXT_CONTROL ) {
  95       _mesa_debug(NULL, "Context does not contain control registers, terminating!\n");
  96       return EXCEPTION_EXECUTE_HANDLER;
  97    }
  98    ctx->Eip += 3;
  99
 100    return EXCEPTION_CONTINUE_EXECUTION;
 101 }
 102 #endif /* WIN32 */
 103
 104
 105 static void check_os_sse_support( void )
 106 {
 107 #if defined(__FreeBSD__)
 108    {
 109       int ret, enabled;
 110       unsigned int len;
 111       len = sizeof(enabled);
 112       ret = sysctlbyname("hw.instruction_sse", &enabled, &len, NULL, 0);
 113       if (ret || !enabled)
 114          _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 115    }
 116 #elif defined(WIN32)
 117    LPTOP_LEVEL_EXCEPTION_FILTER oldFilter;
 118
 119    /* Install our ExceptionFilter */
 120    oldFilter = SetUnhandledExceptionFilter( ExceptionFilter );
 121
 122    if ( cpu_has_xmm ) {
 123       _mesa_debug(NULL, "Testing OS support for SSE...\n");
 124
 125       _mesa_test_os_sse_support();
 126
 127       if ( cpu_has_xmm ) {
 128          _mesa_debug(NULL, "Yes.\n");
 129       } else {
 130          _mesa_debug(NULL, "No!\n");
 131       }
 132    }
 133
 134    if ( cpu_has_xmm ) {
 135       _mesa_debug(NULL, "Testing OS support for SSE unmasked exceptions...\n");
 136
 137       _mesa_test_os_sse_exception_support();
 138
 139       if ( cpu_has_xmm ) {
 140          _mesa_debug(NULL, "Yes.\n");
 141       } else {
 142          _mesa_debug(NULL, "No!\n");
 143       }
 144    }
 145
 146    /* Restore previous exception filter */
 147    SetUnhandledExceptionFilter( oldFilter );
 148
 149    if ( cpu_has_xmm ) {
 150       _mesa_debug(NULL, "Tests of OS support for SSE passed.\n");
 151    } else {
 152       _mesa_debug(NULL, "Tests of OS support for SSE failed!\n");
 153    }
 154 #else
 155    /* Do nothing on other platforms for now.
 156     */
 157    _mesa_debug(NULL, "Not testing OS support for SSE, leaving enabled.\n");
 158 #endif /* __FreeBSD__ */
 159 }
 160
 161 #endif /* USE_SSE_ASM */
 162
 163
 164 void _mesa_init_all_x86_transform_asm( void )
 165 {
 166 #ifdef USE_X86_ASM
 167    _mesa_x86_cpu_features = 0;
 168
 169    if (!_mesa_x86_has_cpuid()) {
 170        _mesa_debug(NULL, "CPUID not detected\n");
 171    }
 172    else {
 173        GLuint cpu_features;
 174        GLuint cpu_ext_features;
 175        GLuint cpu_ext_info;
 176        char cpu_vendor[13];
 177        GLuint result;
 178
 179        /* get vendor name */
 180        _mesa_x86_cpuid(0, &result, (GLuint *)(cpu_vendor + 0), (GLuint *)(cpu_vendor + 8), (GLuint *)(cpu_vendor + 4));
 181        cpu_vendor[12] = '\0';
 182
 183        _mesa_debug(NULL, "CPU vendor: %s\n", cpu_vendor);
 184
 185        /* get cpu features */
 186        cpu_features = _mesa_x86_cpuid_edx(1);
 187
 188        if (cpu_features & X86_CPU_FPU)
 189            _mesa_x86_cpu_features |= X86_FEATURE_FPU;
 190        if (cpu_features & X86_CPU_CMOV)
 191            _mesa_x86_cpu_features |= X86_FEATURE_CMOV;
 192
 193 #ifdef USE_MMX_ASM
 194        if (cpu_features & X86_CPU_MMX)
 195            _mesa_x86_cpu_features |= X86_FEATURE_MMX;
 196 #endif
 197
 198 #ifdef USE_SSE_ASM
 199        if (cpu_features & X86_CPU_XMM)
 200            _mesa_x86_cpu_features |= X86_FEATURE_XMM;
 201        if (cpu_features & X86_CPU_XMM2)
 202            _mesa_x86_cpu_features |= X86_FEATURE_XMM2;
 203 #endif
 204
 205        /* query extended cpu features */
 206        if ((cpu_ext_info = _mesa_x86_cpuid_eax(0x80000000)) > 0x80000000) {
 207            if (cpu_ext_info >= 0x80000001) {
 208
 209                cpu_ext_features = _mesa_x86_cpuid_edx(0x80000001);
 210
 211                if (cpu_features & X86_CPU_MMX) {
 212
 213 #ifdef USE_3DNOW_ASM
 214                    if (cpu_ext_features & X86_CPUEXT_3DNOW)
 215                        _mesa_x86_cpu_features |= X86_FEATURE_3DNOW;
 216                    if (cpu_ext_features & X86_CPUEXT_3DNOW_EXT)
 217                        _mesa_x86_cpu_features |= X86_FEATURE_3DNOWEXT;
 218 #endif
 219
 220 #ifdef USE_MMX_ASM
 221                    if (cpu_ext_features & X86_CPUEXT_MMX_EXT)
 222                        _mesa_x86_cpu_features |= X86_FEATURE_MMXEXT;
 223 #endif
 224                }
 225            }
 226
 227            /* query cpu name */
 228            if (cpu_ext_info >= 0x80000002) {
 229                GLuint ofs;
 230                char cpu_name[49];
 231                for (ofs = 0; ofs < 3; ofs++)
 232                    _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));
 233                cpu_name[48] = '\0'; /* the name should be NULL terminated, but just to be sure */
 234
 235                _mesa_debug(NULL, "CPU name: %s\n", cpu_name);
 236            }
 237        }
 238
 239    }
 240
 241    if ( _mesa_getenv( "MESA_NO_ASM" ) ) {
 242       _mesa_x86_cpu_features = 0;
 243    }
 244
 245    if ( _mesa_x86_cpu_features ) {
 246       _mesa_init_x86_transform_asm();
 247    }
 248
 249 #ifdef USE_MMX_ASM
 250    if ( cpu_has_mmx ) {
 251       if ( _mesa_getenv( "MESA_NO_MMX" ) == 0 ) {
 252          _mesa_debug(NULL, "MMX cpu detected.\n");
 253       } else {
 254          _mesa_x86_cpu_features &= ~(X86_FEATURE_MMX);
 255       }
 256    }
 257 #endif
 258
 259 #ifdef USE_3DNOW_ASM
 260    if ( cpu_has_3dnow ) {
 261       if ( _mesa_getenv( "MESA_NO_3DNOW" ) == 0 ) {
 262          _mesa_debug(NULL, "3DNow! cpu detected.\n");
 263          _mesa_init_3dnow_transform_asm();
 264       } else {
 265          _mesa_x86_cpu_features &= ~(X86_FEATURE_3DNOW);
 266       }
 267    }
 268 #endif
 269
 270 #ifdef USE_SSE_ASM
 271    if ( cpu_has_xmm ) {
 272       if ( _mesa_getenv( "MESA_NO_SSE" ) == 0 ) {
 273          _mesa_debug(NULL, "SSE cpu detected.\n");
 274          if ( _mesa_getenv( "MESA_FORCE_SSE" ) == 0 ) {
 275             check_os_sse_support();
 276          }
 277          if ( cpu_has_xmm ) {
 278             _mesa_init_sse_transform_asm();
 279          }
 280       } else {
 281          _mesa_debug(NULL, "SSE cpu detected, but switched off by user.\n");
 282          _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 283       }
 284    }
 285 #endif
 286 #endif
 287 }
 288