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/imports.h"
  58 #include "common_x86_asm.h"
  59
  60
  61 /** Bitmask of X86_FEATURE_x bits */
  62 int _mesa_x86_cpu_features = 0x0;
  63
  64 static int detection_debug = GL_FALSE;
  65
  66 /* No reason for this to be public.
  67  */
  68 extern GLuint _mesa_x86_has_cpuid(void);
  69 extern void _mesa_x86_cpuid(GLuint op, GLuint *reg_eax, GLuint *reg_ebx, GLuint *reg_ecx, GLuint *reg_edx);
  70 extern GLuint _mesa_x86_cpuid_eax(GLuint op);
  71 extern GLuint _mesa_x86_cpuid_ebx(GLuint op);
  72 extern GLuint _mesa_x86_cpuid_ecx(GLuint op);
  73 extern GLuint _mesa_x86_cpuid_edx(GLuint op);
  74
  75
  76 #if defined(USE_SSE_ASM)
  77 /*
  78  * We must verify that the Streaming SIMD Extensions are truly supported
  79  * on this processor before we go ahead and hook out the optimized code.
  80  *
  81  * However, I have been told by Alan Cox that all 2.4 (and later) Linux
  82  * kernels provide full SSE support on all processors that expose SSE via
  83  * the CPUID mechanism.
  84  */
  85
  86 /* These are assembly functions: */
  87 extern void _mesa_test_os_sse_support( void );
  88 extern void _mesa_test_os_sse_exception_support( void );
  89
  90
  91 #if defined(_WIN32)
  92 #ifndef STATUS_FLOAT_MULTIPLE_TRAPS
  93 # define STATUS_FLOAT_MULTIPLE_TRAPS (0xC00002B5L)
  94 #endif
  95 static LONG WINAPI ExceptionFilter(LPEXCEPTION_POINTERS exp)
  96 {
  97    PEXCEPTION_RECORD rec = exp->ExceptionRecord;
  98    PCONTEXT ctx = exp->ContextRecord;
  99
 100    if ( rec->ExceptionCode == EXCEPTION_ILLEGAL_INSTRUCTION ) {
 101       _mesa_debug(NULL, "EXCEPTION_ILLEGAL_INSTRUCTION\n" );
 102       _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 103    } else if ( rec->ExceptionCode == STATUS_FLOAT_MULTIPLE_TRAPS ) {
 104       _mesa_debug(NULL, "STATUS_FLOAT_MULTIPLE_TRAPS\n");
 105       /* Windows seems to clear the exception flag itself, we just have to increment Eip */
 106    } else {
 107       _mesa_debug(NULL, "UNEXPECTED EXCEPTION (0x%08x), terminating!\n" );
 108       return EXCEPTION_EXECUTE_HANDLER;
 109    }
 110
 111    if ( (ctx->ContextFlags & CONTEXT_CONTROL) != CONTEXT_CONTROL ) {
 112       _mesa_debug(NULL, "Context does not contain control registers, terminating!\n");
 113       return EXCEPTION_EXECUTE_HANDLER;
 114    }
 115    ctx->Eip += 3;
 116
 117    return EXCEPTION_CONTINUE_EXECUTION;
 118 }
 119 #endif /* _WIN32 */
 120
 121
 122 /**
 123  * Check if SSE is supported.
 124  * If not, turn off the X86_FEATURE_XMM flag in _mesa_x86_cpu_features.
 125  */
 126 void _mesa_check_os_sse_support( void )
 127 {
 128 #if defined(__FreeBSD__)
 129    {
 130       int ret, enabled;
 131       unsigned int len;
 132       len = sizeof(enabled);
 133       ret = sysctlbyname("hw.instruction_sse", &enabled, &len, NULL, 0);
 134       if (ret || !enabled)
 135          _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 136    }
 137 #elif defined (__NetBSD__)
 138    {
 139       int ret, enabled;
 140       size_t len = sizeof(enabled);
 141       ret = sysctlbyname("machdep.sse", &enabled, &len, (void *)NULL, 0);
 142       if (ret || !enabled)
 143          _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 144    }
 145 #elif defined(__OpenBSD__)
 146    {
 147       int mib[2];
 148       int ret, enabled;
 149       size_t len = sizeof(enabled);
 150
 151       mib[0] = CTL_MACHDEP;
 152       mib[1] = CPU_SSE;
 153
 154       ret = sysctl(mib, 2, &enabled, &len, NULL, 0);
 155       if (ret || !enabled)
 156          _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 157    }
 158 #elif defined(_WIN32)
 159    LPTOP_LEVEL_EXCEPTION_FILTER oldFilter;
 160
 161    /* Install our ExceptionFilter */
 162    oldFilter = SetUnhandledExceptionFilter( ExceptionFilter );
 163
 164    if ( cpu_has_xmm ) {
 165       _mesa_debug(NULL, "Testing OS support for SSE...\n");
 166
 167       _mesa_test_os_sse_support();
 168
 169       if ( cpu_has_xmm ) {
 170          _mesa_debug(NULL, "Yes.\n");
 171       } else {
 172          _mesa_debug(NULL, "No!\n");
 173       }
 174    }
 175
 176    if ( cpu_has_xmm ) {
 177       _mesa_debug(NULL, "Testing OS support for SSE unmasked exceptions...\n");
 178
 179       _mesa_test_os_sse_exception_support();
 180
 181       if ( cpu_has_xmm ) {
 182          _mesa_debug(NULL, "Yes.\n");
 183       } else {
 184          _mesa_debug(NULL, "No!\n");
 185       }
 186    }
 187
 188    /* Restore previous exception filter */
 189    SetUnhandledExceptionFilter( oldFilter );
 190
 191    if ( cpu_has_xmm ) {
 192       _mesa_debug(NULL, "Tests of OS support for SSE passed.\n");
 193    } else {
 194       _mesa_debug(NULL, "Tests of OS support for SSE failed!\n");
 195    }
 196 #else
 197    /* Do nothing on other platforms for now.
 198     */
 199    if (detection_debug)
 200       _mesa_debug(NULL, "Not testing OS support for SSE, leaving enabled.\n");
 201 #endif /* __FreeBSD__ */
 202 }
 203
 204 #endif /* USE_SSE_ASM */
 205
 206
 207 /**
 208  * Initialize the _mesa_x86_cpu_features bitfield.
 209  * This is a no-op if called more than once.
 210  */
 211 void
 212 _mesa_get_x86_features(void)
 213 {
 214    static int called = 0;
 215
 216    if (called)
 217       return;
 218
 219    called = 1;
 220
 221 #ifdef USE_X86_ASM
 222    _mesa_x86_cpu_features = 0x0;
 223
 224    if (getenv( "MESA_NO_ASM")) {
 225       return;
 226    }
 227
 228    if (!_mesa_x86_has_cpuid()) {
 229        _mesa_debug(NULL, "CPUID not detected\n");
 230    }
 231    else {
 232        GLuint cpu_features, cpu_features_ecx;
 233        GLuint cpu_ext_features;
 234        GLuint cpu_ext_info;
 235        char cpu_vendor[13];
 236        GLuint result;
 237
 238        /* get vendor name */
 239        _mesa_x86_cpuid(0, &result, (GLuint *)(cpu_vendor + 0), (GLuint *)(cpu_vendor + 8), (GLuint *)(cpu_vendor + 4));
 240        cpu_vendor[12] = '\0';
 241
 242        if (detection_debug)
 243           _mesa_debug(NULL, "CPU vendor: %s\n", cpu_vendor);
 244
 245        /* get cpu features */
 246        cpu_features = _mesa_x86_cpuid_edx(1);
 247        cpu_features_ecx = _mesa_x86_cpuid_ecx(1);
 248
 249        if (cpu_features & X86_CPU_FPU)
 250            _mesa_x86_cpu_features |= X86_FEATURE_FPU;
 251        if (cpu_features & X86_CPU_CMOV)
 252            _mesa_x86_cpu_features |= X86_FEATURE_CMOV;
 253
 254 #ifdef USE_MMX_ASM
 255        if (cpu_features & X86_CPU_MMX)
 256            _mesa_x86_cpu_features |= X86_FEATURE_MMX;
 257 #endif
 258
 259 #ifdef USE_SSE_ASM
 260        if (cpu_features & X86_CPU_XMM)
 261            _mesa_x86_cpu_features |= X86_FEATURE_XMM;
 262        if (cpu_features & X86_CPU_XMM2)
 263            _mesa_x86_cpu_features |= X86_FEATURE_XMM2;
 264        if (cpu_features_ecx & X86_CPU_SSE4_1)
 265            _mesa_x86_cpu_features |= X86_FEATURE_SSE4_1;
 266 #endif
 267
 268        /* query extended cpu features */
 269        if ((cpu_ext_info = _mesa_x86_cpuid_eax(0x80000000)) > 0x80000000) {
 270            if (cpu_ext_info >= 0x80000001) {
 271
 272                cpu_ext_features = _mesa_x86_cpuid_edx(0x80000001);
 273
 274                if (cpu_features & X86_CPU_MMX) {
 275
 276 #ifdef USE_3DNOW_ASM
 277                    if (cpu_ext_features & X86_CPUEXT_3DNOW)
 278                        _mesa_x86_cpu_features |= X86_FEATURE_3DNOW;
 279                    if (cpu_ext_features & X86_CPUEXT_3DNOW_EXT)
 280                        _mesa_x86_cpu_features |= X86_FEATURE_3DNOWEXT;
 281 #endif
 282
 283 #ifdef USE_MMX_ASM
 284                    if (cpu_ext_features & X86_CPUEXT_MMX_EXT)
 285                        _mesa_x86_cpu_features |= X86_FEATURE_MMXEXT;
 286 #endif
 287                }
 288            }
 289
 290            /* query cpu name */
 291            if (cpu_ext_info >= 0x80000002) {
 292                GLuint ofs;
 293                char cpu_name[49];
 294                for (ofs = 0; ofs < 3; ofs++)
 295                    _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));
 296                cpu_name[48] = '\0'; /* the name should be NULL terminated, but just to be sure */
 297
 298                if (detection_debug)
 299                   _mesa_debug(NULL, "CPU name: %s\n", cpu_name);
 300            }
 301        }
 302
 303    }
 304
 305 #ifdef USE_MMX_ASM
 306    if ( cpu_has_mmx ) {
 307       if ( getenv( "MESA_NO_MMX" ) == 0 ) {
 308          if (detection_debug)
 309             _mesa_debug(NULL, "MMX cpu detected.\n");
 310       } else {
 311          _mesa_x86_cpu_features &= ~(X86_FEATURE_MMX);
 312       }
 313    }
 314 #endif
 315
 316 #ifdef USE_3DNOW_ASM
 317    if ( cpu_has_3dnow ) {
 318       if ( getenv( "MESA_NO_3DNOW" ) == 0 ) {
 319          if (detection_debug)
 320             _mesa_debug(NULL, "3DNow! cpu detected.\n");
 321       } else {
 322          _mesa_x86_cpu_features &= ~(X86_FEATURE_3DNOW);
 323       }
 324    }
 325 #endif
 326
 327 #ifdef USE_SSE_ASM
 328    if ( cpu_has_xmm ) {
 329       if ( getenv( "MESA_NO_SSE" ) == 0 ) {
 330          if (detection_debug)
 331             _mesa_debug(NULL, "SSE cpu detected.\n");
 332          if ( getenv( "MESA_FORCE_SSE" ) == 0 ) {
 333             _mesa_check_os_sse_support();
 334          }
 335       } else {
 336          _mesa_debug(NULL, "SSE cpu detected, but switched off by user.\n");
 337          _mesa_x86_cpu_features &= ~(X86_FEATURE_XMM);
 338       }
 339    }
 340 #endif
 341
 342 #elif defined(USE_X86_64_ASM)
 343    {
 344       unsigned int eax, ebx, ecx, edx;
 345
 346       /* Always available on x86-64. */
 347       _mesa_x86_cpu_features |= X86_FEATURE_XMM | X86_FEATURE_XMM2;
 348
 349       if (!__get_cpuid(1, &eax, &ebx, &ecx, &edx))
 350          return;
 351
 352       if (ecx & bit_SSE4_1)
 353          _mesa_x86_cpu_features |= X86_FEATURE_SSE4_1;
 354    }
 355 #endif /* USE_X86_64_ASM */
 356
 357    (void) detection_debug;
 358 }