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/* $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 <holger@akaflieg.extern.tu-berlin.de>
*
* Cleaned up and simplified by Gareth Hughes <gareth@valinux.com>
*/
#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
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