diff options
Diffstat (limited to 'src/mesa/x86/common_x86_asm.S')
| -rw-r--r-- | src/mesa/x86/common_x86_asm.S | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/mesa/x86/common_x86_asm.S b/src/mesa/x86/common_x86_asm.S new file mode 100644 index 00000000000..675711e44aa --- /dev/null +++ b/src/mesa/x86/common_x86_asm.S @@ -0,0 +1,152 @@ +/* $Id: common_x86_asm.S,v 1.2 2000/10/23 00:16:28 gareth Exp $ */ + +/* + * Mesa 3-D graphics library + * Version: 3.5 + * + * Copyright (C) 1999-2000 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 + * BRIAN PAUL 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. + */ + +/* + * Check extended CPU capabilities. Now justs returns the raw CPUID + * feature information, allowing the higher level code to interpret the + * results. + * + * Written by Holger Waechtler <[email protected]> + * + * Cleaned up and simplified by Gareth Hughes <[email protected]> + */ + +#include "assyntax.h" +#include "common_x86_features.h" + + +/* Intel vendor string + */ +#define GENU 0x756e6547 /* "Genu" */ +#define INEI 0x49656e69 /* "ineI" */ +#define NTEL 0x6c65746e /* "ntel" */ + +/* AMD vendor string + */ +#define AUTH 0x68747541 /* "Auth" */ +#define ENTI 0x69746e65 /* "enti" */ +#define CAMD 0x444d4163 /* "cAMD" */ + + + SEG_DATA + +/* We might want to print out some useful messages. + */ +LLBL( found_intel ): STRING( "Genuine Intel processor found\n\0" ) +LLBL( found_amd ): STRING( "Authentic AMD processor found\n\0" ) + + + SEG_TEXT + +ALIGNTEXT4 +GLOBL GLNAME( gl_identify_x86_cpu_features ) +GLNAME( gl_identify_x86_cpu_features ): + + PUSH_L ( EBX ) + + /* Test for the CPUID command. If the ID Flag bit in EFLAGS + * (bit 21) is writable, the CPUID command is present. + */ + PUSHF_L + POP_L ( EAX ) + MOV_L ( EAX, ECX ) + XOR_L ( CONST(0x00200000), EAX ) + PUSH_L ( EAX ) + POPF_L + PUSHF_L + POP_L ( EAX ) + + /* Verify the ID Flag bit has been written. + */ + CMP_L ( ECX, EAX ) + JZ ( LLBL ( cpuid_done ) ) + + /* Get the CPU vendor info. + */ + XOR_L ( EAX, EAX ) + CPUID + + /* Test for Intel processors. We must look for the + * "GenuineIntel" string in EBX, ECX and EDX. + */ + CMP_L ( CONST(GENU), EBX ) + JNE ( LLBL( cpuid_amd ) ) + CMP_L ( CONST(INEI), EDX ) + JNE ( LLBL( cpuid_amd ) ) + CMP_L ( CONST(NTEL), ECX ) + JNE ( LLBL( cpuid_amd ) ) + + /* We have an Intel processor, so we can get the feature + * information with an CPUID input value of 1. + */ + MOV_L ( CONST(0x1), EAX ) + CPUID + MOV_L ( EDX, EAX ) + JMP ( LLBL( cpuid_done ) ) + +LLBL( cpuid_amd ): + + /* Test for AMD processors. We must look for the + * "AuthenticAMD" string in EBX, ECX and EDX. + */ + CMP_L ( CONST(AUTH), EBX ) + JNE ( LLBL( cpuid_other ) ) + CMP_L ( CONST(ENTI), EDX ) + JNE ( LLBL( cpuid_other ) ) + CMP_L ( CONST(CAMD), ECX ) + JNE ( LLBL( cpuid_other ) ) + + /* We have an AMD processor, so we can get the feature + * information after we verify that the extended functions are + * supported. + */ + MOV_L ( CONST(0x80000000), EAX ) + CPUID + TEST_L ( EAX, EAX ) + JZ ( LLBL ( cpuid_failed ) ) + + MOV_L ( CONST(0x80000001), EAX ) + CPUID + MOV_L ( EDX, EAX ) + JMP ( LLBL ( cpuid_done ) ) + +LLBL( cpuid_other ): + + /* Test for other processors here when required. + */ + +LLBL( cpuid_failed ): + + /* If we can't determine the feature information, we must + * return zero to indicate that no platform-specific + * optimizations can be used. + */ + MOV_L ( CONST(0), EAX ) + +LLBL ( cpuid_done ): + + POP_L ( EBX ) + RET |