This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
- Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk>
+ 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
#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"
-static pa_cpu_arm_flag_t pa_cpu_arm_flags;
+#if defined (__arm__) && defined (__linux__)
-void pa_cpu_init_arm (void) {
+#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);
+ }
+ }
+
+ /* 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__)
- pa_cpu_arm_flags = 0;
-
- pa_log ("ARM init\n");
+#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__) */
- pa_volume_func_init_arm (pa_cpu_arm_flags);
+#else /* defined (__arm__) */
+ return false;
#endif /* defined (__arm__) */
}