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426d0e1aa8
Add awareness and a thin wrapper function around a new Linux system call that allows callers to get architecture and microarchitecture information about the CPUs from the kernel. This can be used to do things like dynamically choose a memcpy implementation. Signed-off-by: Evan Green <evan@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
36 lines
1.3 KiB
C
36 lines
1.3 KiB
C
/* RISC-V hardware feature probing support on Linux
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/syscall.h>
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#include <sys/hwprobe.h>
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#include <sysdep.h>
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#include <sysdep-vdso.h>
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int __riscv_hwprobe (struct riscv_hwprobe *pairs, size_t pair_count,
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size_t cpu_count, unsigned long int *cpus,
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unsigned int flags)
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{
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int r;
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r = INTERNAL_SYSCALL_CALL (riscv_hwprobe, pairs, pair_count,
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cpu_count, cpus, flags);
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/* Negate negative errno values to match pthreads API. */
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return -r;
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}
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