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/***
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);
}
}
/* 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__) */
}
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