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/*
* Copyright (c) 2018, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include <fcntl.h>
#include <unistd.h>
#include <stdint.h>
#include <asm/cputable.h>
#include <linux/auxvec.h>
#include "config/aom_config.h"
#include "aom_ports/ppc.h"
#if CONFIG_RUNTIME_CPU_DETECT
static int cpu_env_flags(int *flags) {
char *env;
env = getenv("AOM_SIMD_CAPS");
if (env && *env) {
*flags = (int)strtol(env, NULL, 0);
return 0;
}
*flags = 0;
return -1;
}
static int cpu_env_mask(void) {
char *env;
env = getenv("AOM_SIMD_CAPS_MASK");
return env && *env ? (int)strtol(env, NULL, 0) : ~0;
}
int ppc_simd_caps(void) {
int flags;
int mask;
int fd;
ssize_t count;
unsigned int i;
uint64_t buf[64];
// If VPX_SIMD_CAPS is set then allow only those capabilities.
if (!cpu_env_flags(&flags)) {
return flags;
}
mask = cpu_env_mask();
fd = open("/proc/self/auxv", O_RDONLY);
if (fd < 0) {
return 0;
}
while ((count = read(fd, buf, sizeof(buf))) > 0) {
for (i = 0; i < (count / sizeof(*buf)); i += 2) {
if (buf[i] == AT_HWCAP) {
#if HAVE_VSX
if (buf[i + 1] & PPC_FEATURE_HAS_VSX) {
flags |= HAS_VSX;
}
#endif // HAVE_VSX
goto out_close;
} else if (buf[i] == AT_NULL) {
goto out_close;
}
}
}
out_close:
close(fd);
return flags & mask;
}
#else
// If there is no RTCD the function pointers are not used and can not be
// changed.
int ppc_simd_caps(void) { return 0; }
#endif // CONFIG_RUNTIME_CPU_DETECT
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