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- /* Low-level functions for atomic operations. RISC-V version.
- Copyright (C) 2014-2026 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 _LINUX_RISCV_BITS_ATOMIC_H
- #define _LINUX_RISCV_BITS_ATOMIC_H 1
- #ifdef __riscv_atomic
- /* Miscellaneous. */
- # define asm_amo(which, ordering, mem, value) ({ \
- __atomic_check_size (mem); \
- typeof (*mem) __tmp; \
- if (sizeof (__tmp) == 4) \
- asm volatile (which ".w" ordering "\t%0, %z2, %1" \
- : "=r" (__tmp), "+A" (* (mem)) \
- : "rJ" (value)); \
- else if (sizeof (__tmp) == 8) \
- asm volatile (which ".d" ordering "\t%0, %z2, %1" \
- : "=r" (__tmp), "+A" (* (mem)) \
- : "rJ" (value)); \
- else \
- abort (); \
- __tmp; })
- # define atomic_max(mem, value) asm_amo ("amomaxu", ".aq", mem, value)
- # define atomic_min(mem, value) asm_amo ("amominu", ".aq", mem, value)
- #else /* __riscv_atomic */
- # error "ISAs that do not subsume the A extension are not supported"
- #endif /* !__riscv_atomic */
- /* Execute a PAUSE hint when spinning. */
- #define atomic_spin_nop() __asm(".insn i 0x0f, 0, x0, x0, 0x010")
- #endif /* bits/atomic.h */
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