sl@0: /*
sl@0:  * LIBOIL - Library of Optimized Inner Loops
sl@0:  * Copyright (c) 2003,2004 David A. Schleef <ds@schleef.org>
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
sl@0:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
sl@0:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
sl@0:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
sl@0:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
sl@0:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
sl@0:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
sl@0:  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
sl@0:  * POSSIBILITY OF SUCH DAMAGE.
sl@0:  */
sl@0: 
sl@0: #ifdef HAVE_CONFIG_H
sl@0: #include "config.h"
sl@0: #endif
sl@0: #include <liboil/liboilfunction.h>
sl@0: #include <liboil/liboildebug.h>
sl@0: #include <liboil/liboilcpu.h>
sl@0: #include <liboil/liboilfault.h>
sl@0: #include <liboil/liboilutils.h>
sl@0: 
sl@0: #if defined(__linux__)
sl@0: #include <linux/auxvec.h>
sl@0: #include <sys/types.h>
sl@0: #include <sys/stat.h>
sl@0: #include <fcntl.h>
sl@0: #include <unistd.h>
sl@0: #include <stdio.h>
sl@0: 
sl@0: #ifndef PPC_FEATURE_HAS_ALTIVEC
sl@0: /* From linux-2.6/include/asm-powerpc/cputable.h */
sl@0: #define PPC_FEATURE_HAS_ALTIVEC 0x10000000
sl@0: #endif
sl@0: 
sl@0: #endif
sl@0: 
sl@0: #if defined(__APPLE__)
sl@0: #include <sys/types.h>
sl@0: #include <sys/sysctl.h>
sl@0: #endif
sl@0: 
sl@0: #if defined(__FreeBSD__)
sl@0: #include <sys/types.h>
sl@0: #include <sys/sysctl.h>
sl@0: #endif
sl@0: 
sl@0: 
sl@0: /***** powerpc *****/
sl@0: 
sl@0: static unsigned long
sl@0: oil_profile_stamp_tb(void)
sl@0: {
sl@0:   unsigned long ts;
sl@0:   __asm__ __volatile__("mftb %0\n" : "=r" (ts));
sl@0:   return ts;
sl@0: }
sl@0: 
sl@0: #if !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && !defined(__APPLE__) && !defined(__linux__)
sl@0: static void
sl@0: test_altivec (void * ignored)
sl@0: {
sl@0:   asm volatile ("vor v0, v0, v0\n");
sl@0: }
sl@0: #endif
sl@0: 
sl@0: #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
sl@0: static void
sl@0: oil_check_altivec_sysctl_freebsd (void)
sl@0: {
sl@0:   int ret, av;
sl@0:   size_t len;
sl@0: 
sl@0:   len = sizeof(av);
sl@0:   ret = sysctlbyname("hw.altivec", &av, &len, NULL, 0);
sl@0:   if (!ret && av) {
sl@0:     oil_cpu_flags |= OIL_IMPL_FLAG_ALTIVEC;
sl@0:   }
sl@0: }
sl@0: #endif
sl@0: 
sl@0: #if defined(__APPLE__)
sl@0: static void
sl@0: oil_check_altivec_sysctl_darwin (void)
sl@0: {
sl@0:   int ret, vu;
sl@0:   size_t len;
sl@0: 
sl@0:   len = sizeof(vu);
sl@0:   ret = sysctlbyname("hw.vectorunit", &vu, &len, NULL, 0);
sl@0:   if (!ret && vu) {
sl@0:     oil_cpu_flags |= OIL_IMPL_FLAG_ALTIVEC;
sl@0:   }
sl@0: }
sl@0: #endif
sl@0: 
sl@0: #if defined(__linux__)
sl@0: static void
sl@0: oil_check_altivec_proc_auxv (void)
sl@0: {
sl@0:   static int available = -1;
sl@0:   int new_avail = 0;
sl@0:   unsigned long buf[64];
sl@0:   ssize_t count;
sl@0:   int fd, i;
sl@0: 
sl@0:   /* Flags already set */
sl@0:   if (available != -1) {
sl@0:     return;
sl@0:   }
sl@0: 
sl@0:   fd = open("/proc/self/auxv", O_RDONLY);
sl@0:   if (fd < 0) {
sl@0:     goto out;
sl@0:   }
sl@0: 
sl@0: more:
sl@0:   count = read(fd, buf, sizeof(buf));
sl@0:   if (count < 0) {
sl@0:     goto out_close;
sl@0:   }
sl@0: 
sl@0:   for (i=0; i < (count / sizeof(unsigned long)); i += 2) {
sl@0:     if (buf[i] == AT_HWCAP) {
sl@0:       new_avail = !!(buf[i+1] & PPC_FEATURE_HAS_ALTIVEC);
sl@0:       goto out_close;
sl@0:     } else if (buf[i] == AT_NULL) {
sl@0:       goto out_close;
sl@0:     }
sl@0:   }
sl@0: 
sl@0:   if (count == sizeof(buf)) {
sl@0:     goto more;
sl@0:   }
sl@0: 
sl@0: out_close:
sl@0:   close(fd);
sl@0: 
sl@0: out:
sl@0:   available = new_avail;
sl@0:   if (available) {
sl@0:     oil_cpu_flags |= OIL_IMPL_FLAG_ALTIVEC;
sl@0:   }
sl@0: }
sl@0: #endif
sl@0: 
sl@0: #if !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && !defined(__APPLE__) && !defined(__linux__)
sl@0: static void
sl@0: oil_check_altivec_fault (void)
sl@0: {
sl@0:   oil_fault_check_enable ();
sl@0:   if (oil_fault_check_try(test_altivec, NULL)) {
sl@0:     OIL_DEBUG ("cpu flag altivec");
sl@0:     oil_cpu_flags |= OIL_IMPL_FLAG_ALTIVEC;
sl@0:   }
sl@0:   oil_fault_check_disable ();
sl@0: }
sl@0: #endif
sl@0: 
sl@0: void
sl@0: oil_cpu_detect_arch(void)
sl@0: {
sl@0: #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
sl@0:   oil_check_altivec_sysctl_freebsd();
sl@0: #elif defined(__APPLE__)
sl@0:   oil_check_altivec_sysctl_darwin();
sl@0: #elif defined(__linux__)
sl@0:   oil_check_altivec_proc_auxv();
sl@0: #else
sl@0:   oil_check_altivec_fault();
sl@0: #endif
sl@0: 
sl@0:   _oil_profile_stamp = oil_profile_stamp_tb;
sl@0: }
sl@0: 
sl@0: 
sl@0: