mirror of
git://sourceware.org/git/glibc.git
synced 2025-03-06 20:58:33 +01:00
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>
74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
/* RISC-V architecture probe interface
|
|
Copyright (C) 2024 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU C Library.
|
|
|
|
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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _SYS_HWPROBE_H
|
|
#define _SYS_HWPROBE_H 1
|
|
|
|
#include <features.h>
|
|
#include <stddef.h>
|
|
#ifdef __has_include
|
|
# if __has_include (<asm/hwprobe.h>)
|
|
# include <asm/hwprobe.h>
|
|
# endif
|
|
#endif
|
|
|
|
/* Define a (probably stale) version of the interface if the Linux headers
|
|
aren't present. */
|
|
#ifndef RISCV_HWPROBE_KEY_MVENDORID
|
|
struct riscv_hwprobe {
|
|
signed long long int key;
|
|
unsigned long long int value;
|
|
};
|
|
|
|
#define RISCV_HWPROBE_KEY_MVENDORID 0
|
|
#define RISCV_HWPROBE_KEY_MARCHID 1
|
|
#define RISCV_HWPROBE_KEY_MIMPID 2
|
|
#define RISCV_HWPROBE_KEY_BASE_BEHAVIOR 3
|
|
#define RISCV_HWPROBE_BASE_BEHAVIOR_IMA (1 << 0)
|
|
#define RISCV_HWPROBE_KEY_IMA_EXT_0 4
|
|
#define RISCV_HWPROBE_IMA_FD (1 << 0)
|
|
#define RISCV_HWPROBE_IMA_C (1 << 1)
|
|
#define RISCV_HWPROBE_IMA_V (1 << 2)
|
|
#define RISCV_HWPROBE_EXT_ZBA (1 << 3)
|
|
#define RISCV_HWPROBE_EXT_ZBB (1 << 4)
|
|
#define RISCV_HWPROBE_EXT_ZBS (1 << 5)
|
|
#define RISCV_HWPROBE_EXT_ZICBOZ (1 << 6)
|
|
#define RISCV_HWPROBE_KEY_CPUPERF_0 5
|
|
#define RISCV_HWPROBE_MISALIGNED_UNKNOWN (0 << 0)
|
|
#define RISCV_HWPROBE_MISALIGNED_EMULATED (1 << 0)
|
|
#define RISCV_HWPROBE_MISALIGNED_SLOW (2 << 0)
|
|
#define RISCV_HWPROBE_MISALIGNED_FAST (3 << 0)
|
|
#define RISCV_HWPROBE_MISALIGNED_UNSUPPORTED (4 << 0)
|
|
#define RISCV_HWPROBE_MISALIGNED_MASK (7 << 0)
|
|
#define RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE 6
|
|
|
|
#endif /* RISCV_HWPROBE_KEY_MVENDORID */
|
|
|
|
__BEGIN_DECLS
|
|
|
|
extern int __riscv_hwprobe (struct riscv_hwprobe *__pairs, size_t __pair_count,
|
|
size_t __cpu_count, unsigned long int *__cpus,
|
|
unsigned int __flags)
|
|
__nonnull ((1)) __wur
|
|
__fortified_attr_access (__read_write__, 1, 2)
|
|
__fortified_attr_access (__read_only__, 4, 3);
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* sys/hwprobe.h */
|