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185 lines
6.4 KiB
C
185 lines
6.4 KiB
C
/* Low-level functions for atomic operations. RISC-V version.
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Copyright (C) 2014-2025 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 _LINUX_RISCV_BITS_ATOMIC_H
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#define _LINUX_RISCV_BITS_ATOMIC_H 1
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#define atomic_full_barrier() __sync_synchronize ()
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#ifdef __riscv_atomic
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# define __HAVE_64B_ATOMICS (__riscv_xlen >= 64)
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# define USE_ATOMIC_COMPILER_BUILTINS 1
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# define ATOMIC_EXCHANGE_USES_CAS 0
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/* Compare and exchange.
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For all "bool" routines, we return FALSE if exchange successful. */
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# define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
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({ \
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typeof (*mem) __oldval = (oldval); \
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!__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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model, __ATOMIC_RELAXED); \
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})
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# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
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({ \
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typeof (*mem) __oldval = (oldval); \
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!__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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model, __ATOMIC_RELAXED); \
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})
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# define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
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({ \
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typeof (*mem) __oldval = (oldval); \
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!__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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model, __ATOMIC_RELAXED); \
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})
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# define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
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({ \
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typeof (*mem) __oldval = (oldval); \
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!__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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model, __ATOMIC_RELAXED); \
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})
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# define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
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({ \
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typeof (*mem) __oldval = (oldval); \
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__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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model, __ATOMIC_RELAXED); \
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__oldval; \
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})
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# define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
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({ \
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typeof (*mem) __oldval = (oldval); \
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__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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model, __ATOMIC_RELAXED); \
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__oldval; \
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})
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# define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
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({ \
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typeof (*mem) __oldval = (oldval); \
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__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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model, __ATOMIC_RELAXED); \
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__oldval; \
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})
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# define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
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({ \
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typeof (*mem) __oldval = (oldval); \
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__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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model, __ATOMIC_RELAXED); \
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__oldval; \
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})
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/* Atomic compare and exchange. */
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# define atomic_compare_and_exchange_bool_acq(mem, new, old) \
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__atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \
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mem, new, old, __ATOMIC_ACQUIRE)
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# define atomic_compare_and_exchange_val_acq(mem, new, old) \
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__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
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mem, new, old, __ATOMIC_ACQUIRE)
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# define atomic_compare_and_exchange_val_rel(mem, new, old) \
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__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
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mem, new, old, __ATOMIC_RELEASE)
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/* Atomic exchange (without compare). */
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# define __arch_exchange_8_int(mem, newval, model) \
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__atomic_exchange_n (mem, newval, model)
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# define __arch_exchange_16_int(mem, newval, model) \
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__atomic_exchange_n (mem, newval, model)
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# define __arch_exchange_32_int(mem, newval, model) \
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__atomic_exchange_n (mem, newval, model)
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# define __arch_exchange_64_int(mem, newval, model) \
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__atomic_exchange_n (mem, newval, model)
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# define atomic_exchange_acq(mem, value) \
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__atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)
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# define atomic_exchange_rel(mem, value) \
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__atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)
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/* Atomically add value and return the previous (unincremented) value. */
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# define __arch_exchange_and_add_8_int(mem, value, model) \
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__atomic_fetch_add (mem, value, model)
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# define __arch_exchange_and_add_16_int(mem, value, model) \
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__atomic_fetch_add (mem, value, model)
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# define __arch_exchange_and_add_32_int(mem, value, model) \
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__atomic_fetch_add (mem, value, model)
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# define __arch_exchange_and_add_64_int(mem, value, model) \
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__atomic_fetch_add (mem, value, model)
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# define atomic_exchange_and_add_acq(mem, value) \
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__atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
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__ATOMIC_ACQUIRE)
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# define atomic_exchange_and_add_rel(mem, value) \
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__atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
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__ATOMIC_RELEASE)
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/* Miscellaneous. */
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# define asm_amo(which, ordering, mem, value) ({ \
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__atomic_check_size (mem); \
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typeof (*mem) __tmp; \
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if (sizeof (__tmp) == 4) \
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asm volatile (which ".w" ordering "\t%0, %z2, %1" \
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: "=r" (__tmp), "+A" (* (mem)) \
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: "rJ" (value)); \
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else if (sizeof (__tmp) == 8) \
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asm volatile (which ".d" ordering "\t%0, %z2, %1" \
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: "=r" (__tmp), "+A" (* (mem)) \
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: "rJ" (value)); \
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else \
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abort (); \
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__tmp; })
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# define atomic_max(mem, value) asm_amo ("amomaxu", ".aq", mem, value)
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# define atomic_min(mem, value) asm_amo ("amominu", ".aq", mem, value)
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# define atomic_bit_test_set(mem, bit) \
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({ typeof (*mem) __mask = (typeof (*mem))1 << (bit); \
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asm_amo ("amoor", ".aq", mem, __mask) & __mask; })
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# define catomic_exchange_and_add(mem, value) \
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atomic_exchange_and_add (mem, value)
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# define catomic_max(mem, value) atomic_max (mem, value)
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#else /* __riscv_atomic */
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# error "ISAs that do not subsume the A extension are not supported"
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#endif /* !__riscv_atomic */
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/* Execute a PAUSE hint when spinning. */
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#define atomic_spin_nop() __asm(".insn i 0x0f, 0, x0, x0, 0x010")
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#endif /* bits/atomic.h */
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