Merge commit 'wtay/optimize'

1 files changed, 140 insertions, 0 deletions

diff --git a/src/pulsecore/cpu-arm.c b/src/pulsecore/cpu-arm.c
new file mode 100644
index 00000000..5a994b71
--- /dev/null
+++ b/src/pulsecore/cpu-arm.c
@@ -0,0 +1,140 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+  Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk> 
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <pulse/xmalloc.h>
+#include <pulsecore/log.h>
+
+#include "cpu-arm.h"
+
+#if defined (__arm__) && defined (__linux__)
+
+#define MAX_BUFFER  4096
+static char *
+get_cpuinfo_line (char *cpuinfo, const char *tag) {
+    char *line, *end, *colon;
+
+    if (!(line = strstr (cpuinfo, tag)))
+        return NULL;
+
+    if (!(end = strchr (line, '\n')))
+        return NULL;
+
+    if (!(colon = strchr (line, ':')))
+        return NULL;
+
+    if (++colon >= end)
+        return NULL;
+
+    return pa_xstrndup (colon, end - colon);
+}
+
+static char *get_cpuinfo(void) {
+    char *cpuinfo;
+    int n, fd;
+
+    if (!(cpuinfo = malloc(MAX_BUFFER)))
+         return NULL;
+
+    if ((fd = open("/proc/cpuinfo", O_RDONLY)) < 0) {
+        free (cpuinfo);
+        return NULL;
+    }
+
+    if ((n = read(fd, cpuinfo, MAX_BUFFER-1)) < 0) {
+        free (cpuinfo);
+        close (fd);
+        return NULL;
+    }
+    cpuinfo[n] = 0;
+    close (fd);
+
+    return cpuinfo;
+}
+#endif /* defined (__arm__) && defined (__linux__) */
+
+void pa_cpu_init_arm (void) {
+#if defined (__arm__)
+#if defined (__linux__)
+    char *cpuinfo, *line;
+    int arch;
+    pa_cpu_arm_flag_t flags = 0;
+
+    /* We need to read the CPU flags from /proc/cpuinfo because there is no user
+     * space support to get the CPU features. This only works on linux AFAIK. */
+    if (!(cpuinfo = get_cpuinfo ())) {
+        pa_log ("Can't read cpuinfo");
+        return;
+    }
+
+    /* get the CPU architecture */
+    if ((line = get_cpuinfo_line (cpuinfo, "CPU architecture"))) {
+        arch = strtoul (line, NULL, 0);
+        if (arch >= 6)
+            flags |= PA_CPU_ARM_V6;
+        if (arch >= 7)
+            flags |= PA_CPU_ARM_V7;
+
+        free (line);
+    }
+    /* get the CPU features */
+    if ((line = get_cpuinfo_line (cpuinfo, "Features"))) {
+        char *state = NULL, *current;
+
+        while ((current = pa_split_spaces (line, &state))) {
+            if (!strcmp (current, "vfp"))
+                flags |= PA_CPU_ARM_VFP;
+            else if (!strcmp (current, "edsp"))
+                flags |= PA_CPU_ARM_EDSP;
+            else if (!strcmp (current, "neon"))
+                flags |= PA_CPU_ARM_NEON;
+            else if (!strcmp (current, "vfpv3"))
+                flags |= PA_CPU_ARM_VFPV3;
+
+            free (current);
+        }
+    }
+    free (cpuinfo);
+
+    pa_log_info ("CPU flags: %s%s%s%s%s%s",
+          (flags & PA_CPU_ARM_V6) ? "V6 " : "",
+          (flags & PA_CPU_ARM_V7) ? "V7 " : "",
+          (flags & PA_CPU_ARM_VFP) ? "VFP " : "",
+          (flags & PA_CPU_ARM_EDSP) ? "EDSP " : "",
+          (flags & PA_CPU_ARM_NEON) ? "NEON " : "",
+          (flags & PA_CPU_ARM_VFPV3) ? "VFPV3 " : "");
+#else /* defined (__linux__) */
+    pa_log ("ARM cpu features not yet supported on this OS");
+#endif /* defined (__linux__) */
+
+    if (flags & PA_CPU_ARM_V6)
+        pa_volume_func_init_arm (flags);
+#endif /* defined (__arm__) */
+}