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a2b47f7d46
Add a little helper method so it's easier to fetch a single value from the hwprobe function when used within an ifunc selector. Signed-off-by: Evan Green <evan@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
114 lines
3.8 KiB
C
114 lines
3.8 KiB
C
/* RISC-V architecture probe interface
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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
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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#ifndef _SYS_HWPROBE_H
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#define _SYS_HWPROBE_H 1
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#include <features.h>
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#include <stddef.h>
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#include <errno.h>
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#ifdef __has_include
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# if __has_include (<asm/hwprobe.h>)
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# include <asm/hwprobe.h>
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# endif
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#endif
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/* Define a (probably stale) version of the interface if the Linux headers
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aren't present. */
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#ifndef RISCV_HWPROBE_KEY_MVENDORID
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struct riscv_hwprobe {
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signed long long int key;
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unsigned long long int value;
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};
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#define RISCV_HWPROBE_KEY_MVENDORID 0
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#define RISCV_HWPROBE_KEY_MARCHID 1
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#define RISCV_HWPROBE_KEY_MIMPID 2
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#define RISCV_HWPROBE_KEY_BASE_BEHAVIOR 3
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#define RISCV_HWPROBE_BASE_BEHAVIOR_IMA (1 << 0)
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#define RISCV_HWPROBE_KEY_IMA_EXT_0 4
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#define RISCV_HWPROBE_IMA_FD (1 << 0)
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#define RISCV_HWPROBE_IMA_C (1 << 1)
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#define RISCV_HWPROBE_IMA_V (1 << 2)
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#define RISCV_HWPROBE_EXT_ZBA (1 << 3)
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#define RISCV_HWPROBE_EXT_ZBB (1 << 4)
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#define RISCV_HWPROBE_EXT_ZBS (1 << 5)
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#define RISCV_HWPROBE_EXT_ZICBOZ (1 << 6)
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#define RISCV_HWPROBE_KEY_CPUPERF_0 5
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#define RISCV_HWPROBE_MISALIGNED_UNKNOWN (0 << 0)
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#define RISCV_HWPROBE_MISALIGNED_EMULATED (1 << 0)
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#define RISCV_HWPROBE_MISALIGNED_SLOW (2 << 0)
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#define RISCV_HWPROBE_MISALIGNED_FAST (3 << 0)
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#define RISCV_HWPROBE_MISALIGNED_UNSUPPORTED (4 << 0)
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#define RISCV_HWPROBE_MISALIGNED_MASK (7 << 0)
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#define RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE 6
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#endif /* RISCV_HWPROBE_KEY_MVENDORID */
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__BEGIN_DECLS
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extern 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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__nonnull ((1)) __wur
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__fortified_attr_access (__read_write__, 1, 2)
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__fortified_attr_access (__read_only__, 4, 3);
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/* A pointer to the __riscv_hwprobe vDSO function is passed as the second
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argument to ifunc selector routines. Include a function pointer type for
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convenience in calling the function in those settings. */
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typedef int (*__riscv_hwprobe_t) (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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__nonnull ((1)) __wur
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__fortified_attr_access (__read_write__, 1, 2)
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__fortified_attr_access (__read_only__, 4, 3);
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/* Helper function usable from ifunc selectors that probes a single key. */
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static __inline int
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__riscv_hwprobe_one(__riscv_hwprobe_t hwprobe_func,
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long long int key,
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unsigned long long int *value)
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{
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struct riscv_hwprobe pair;
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int rc;
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/* Earlier versions of glibc pass NULL as the second ifunc parameter. Other C
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libraries on non-Linux systems may pass +1 as this function pointer to
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indicate no support. Users copying this function to exotic worlds
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(non-Linux non-glibc) may want to do additional validity checks here. */
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if (hwprobe_func == NULL)
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return ENOSYS;
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pair.key = key;
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rc = hwprobe_func (&pair, 1, 0, NULL, 0);
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if (rc != 0)
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return rc;
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if (pair.key < 0)
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return ENOENT;
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*value = pair.value;
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return 0;
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}
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__END_DECLS
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#endif /* sys/hwprobe.h */
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