1 files changed, 170 insertions, 0 deletions
diff --git a/src/pulsecore/cpu-arm.c b/src/pulsecore/cpu-arm.c
new file mode 100644
index 0000000..122a72b
--- /dev/null
+++ b/src/pulsecore/cpu-arm.c
@@ -0,0 +1,170 @@
+/***
+  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, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+#include <pulse/xmalloc.h>
+#include <pulsecore/core-util.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;
+
+    cpuinfo = pa_xmalloc(MAX_BUFFER);
+
+    if ((fd = pa_open_cloexec("/proc/cpuinfo", O_RDONLY, 0)) < 0) {
+        pa_xfree(cpuinfo);
+        return NULL;
+    }
+
+    if ((n = pa_read(fd, cpuinfo, MAX_BUFFER-1, NULL)) < 0) {
+        pa_xfree(cpuinfo);
+        pa_close(fd);
+        return NULL;
+    }
+    cpuinfo[n] = 0;
+    pa_close(fd);
+
+    return cpuinfo;
+}
+#endif /* defined (__arm__) && defined (__linux__) */
+
+void pa_cpu_get_arm_flags(pa_cpu_arm_flag_t *flags) {
+#if defined (__arm__) && defined (__linux__)
+    char *cpuinfo, *line;
+    int arch, part;
+
+    /* 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;
+    }
+
+    *flags = 0;
+
+    /* 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;
+
+        pa_xfree(line);
+    }
+
+    /* get the CPU features */
+    if ((line = get_cpuinfo_line(cpuinfo, "Features"))) {
+        const char *state = NULL;
+        char *current;
+
+        while ((current = pa_split_spaces(line, &state))) {
+            if (pa_streq(current, "vfp"))
+                *flags |= PA_CPU_ARM_VFP;
+            else if (pa_streq(current, "edsp"))
+                *flags |= PA_CPU_ARM_EDSP;
+            else if (pa_streq(current, "neon"))
+                *flags |= PA_CPU_ARM_NEON;
+            else if (pa_streq(current, "vfpv3"))
+                *flags |= PA_CPU_ARM_VFPV3;
+
+            pa_xfree(current);
+        }
+        pa_xfree(line);
+    }
+
+    /* get the CPU part number */
+    if ((line = get_cpuinfo_line(cpuinfo, "CPU part"))) {
+        part = strtoul(line, NULL, 0);
+        if (part == 0xc08)
+            *flags |= PA_CPU_ARM_CORTEX_A8;
+        pa_xfree(line);
+    }
+    pa_xfree(cpuinfo);
+
+    pa_log_info("CPU flags: %s%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 " : "",
+          (*flags & PA_CPU_ARM_CORTEX_A8) ? "Cortex-A8 " : "");
+#endif
+}
+
+bool pa_cpu_init_arm(pa_cpu_arm_flag_t *flags) {
+#if defined (__arm__)
+#if defined (__linux__)
+    pa_cpu_get_arm_flags(flags);
+
+    if (*flags & PA_CPU_ARM_V6)
+        pa_volume_func_init_arm(*flags);
+
+#ifdef HAVE_NEON
+    if (*flags & PA_CPU_ARM_NEON) {
+        pa_convert_func_init_neon(*flags);
+        pa_mix_func_init_neon(*flags);
+        pa_remap_func_init_neon(*flags);
+    }
+#endif
+
+    return true;
+
+#else /* defined (__linux__) */
+    pa_log("Reading ARM CPU features not yet supported on this OS");
+#endif /* defined (__linux__) */
+
+#else /* defined (__arm__) */
+    return false;
+#endif /* defined (__arm__) */
+}