89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
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/*
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* (C) Copyright IBM Corporation 2004
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* on the rights to use, copy, modify, merge, publish, distribute, sub
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* license, and/or sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file common_ppc.c
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* Check CPU capabilities & initialize optimized funtions for this particular
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* processor.
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*
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* \author Ian Romanick <idr@us.ibm.com>
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#ifdef USE_PPC_ASM
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#include <elf.h>
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#endif
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unsigned long _mesa_ppc_cpu_features = 0;
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/**
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* Detect CPU features and install optimized transform and lighting routines.
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* Currently, CPU features are only detected. The optimized routines have
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* yet to be written.
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*
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* \bug
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* This routine is highly specific to Linux kernel 2.6. I'm still waiting
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* to hear back from the glibc folk on how to do this "right".
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*/
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void _mesa_init_all_ppc_transform_asm( void )
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{
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#ifdef USE_PPC_ASM
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const pid_t my_pid = getpid();
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char file_name[32];
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FILE * f;
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#ifdef __powerpc64__
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Elf64_auxv_t v;
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#else
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Elf32_auxv_t v;
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#endif
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sprintf( file_name, "/proc/%u/auxv", (unsigned) my_pid );
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f = fopen( file_name, "rb" );
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if ( f != NULL ) {
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while( 1 ) {
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ssize_t elem = fread( & v, sizeof( v ), 1, f );
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if ( elem < 1 ) {
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break;
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}
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if ( v.a_type == AT_HWCAP ) {
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_mesa_ppc_cpu_features = v.a_un.a_val;
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break;
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}
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}
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fclose( f );
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}
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# ifndef USE_VMX_ASM
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_mesa_ppc_cpu_features &= ~PPC_FEATURES_HAS_ALTIVEC;
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# endif
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#endif
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}
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