File liboil-0.3.13-better-altivec-detect.patch of Package liboil

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File liboil-0.3.13-better-altivec-detect.patch of Package liboil (Revision 46a53a23cc7047f7e5936531c503cc9e)

Currently displaying revision 46a53a23cc7047f7e5936531c503cc9e , Show latest

Index: liboil/liboilcpu-powerpc.c
===================================================================
RCS file: /cvs/liboil/liboil/liboil/liboilcpu-powerpc.c,v
retrieving revision 1.1
diff -u -p -u -p -r1.1 liboilcpu-powerpc.c
--- liboil/liboilcpu-powerpc.c	14 Nov 2007 09:30:20 -0000	1.1
+++ liboil/liboilcpu-powerpc.c	11 Mar 2008 15:07:22 -0000
@@ -44,6 +44,21 @@
 //#include <sys/time.h>
 //#include <time.h>
 
+#if defined(__linux__)
+#include <linux/auxvec.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#ifndef PPC_FEATURE_HAS_ALTIVEC
+/* From linux-2.6/include/asm-powerpc/cputable.h */
+#define PPC_FEATURE_HAS_ALTIVEC 0x10000000
+#endif
+
+#endif
+
 #if defined(__FreeBSD__)
 #include <sys/types.h>
 #include <sys/sysctl.h>
@@ -67,7 +82,7 @@ test_altivec (void * ignored)
 }
 
 #if defined(__FreeBSD__)
-void
+static void
 oil_check_altivec_sysctl (void)
 {
   int ret, av;
@@ -81,6 +96,61 @@ oil_check_altivec_sysctl (void)
 }
 #endif
 
+#if defined(__linux__)
+static void
+oil_check_altivec_proc (void)
+{
+  static int available = -1;
+  int new_avail = 0;
+  char fname[64];
+  unsigned long buf[64];
+  ssize_t count;
+  pid_t pid;
+  int fd, i;
+
+  /* Flags already set */
+  if (available != -1) {
+    return;
+  }
+
+  pid = getpid();
+  snprintf(fname, sizeof(fname)-1, "/proc/%d/auxv", pid);
+
+  fd = open(fname, O_RDONLY);
+  if (fd < 0) {
+    goto out;
+  }
+
+more:
+  count = read(fd, buf, sizeof(buf));
+  if (count < 0) {
+    goto out_close;
+  }
+
+  for (i=0; i < (count / sizeof(unsigned long)); i += 2) {
+    if (buf[i] == AT_HWCAP) {
+      new_avail = !!(buf[i+1] & PPC_FEATURE_HAS_ALTIVEC);
+      goto out_close;
+    } else if (buf[i] == AT_NULL) {
+      goto out_close;
+    }
+  }
+
+  if (count == sizeof(buf)) {
+    goto more;
+  }
+
+out_close:
+  close(fd);
+
+out:
+  available = new_avail;
+  if (available) {
+    oil_cpu_flags |= OIL_IMPL_FLAG_ALTIVEC;
+  }
+}
+#endif
+
 void
 oil_check_altivec_fault (void)
 {
@@ -97,6 +167,8 @@ oil_cpu_detect_arch(void)
 {
 #if defined(__FreeBSD__)
   oil_check_altivec_sysctl();
+#elif defined(__linux__)
+  oil_check_altivec_proc();
 #else
   oil_check_altivec_fault();
 #endif
@@ -104,5 +176,3 @@ oil_cpu_detect_arch(void)
   _oil_profile_stamp = oil_profile_stamp_tb;
 }
 
-
-

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File liboil-0.3.13-better-altivec-detect.patch of Package liboil (Revision 46a53a23cc7047f7e5936531c503cc9e)

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