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/* Initialize CPU feature data. AArch64 version.
This file is part of the GNU C Library.
Copyright (C) 2017 Free Software Foundation, Inc.
The GNU C Library 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.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <cpu-features.h>
#include <sys/auxv.h>
#include <elf/dl-hwcaps.h>
static inline void
init_cpu_features (struct cpu_features *cpu_features)
{
uint64_t hwcap_mask = GET_HWCAP_MASK();
uint64_t hwcap = GLRO (dl_hwcap) & hwcap_mask;
if (hwcap & HWCAP_CPUID)
{
register uint64_t id = 0;
asm volatile ("mrs %0, midr_el1" : "=r"(id));
cpu_features->midr_el1 = id;
}
else
cpu_features->midr_el1 = 0;
}
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