| /* Low-level functions for atomic operations. RISC-V version. |
| Copyright (C) 2014-2018 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _LINUX_RISCV_BITS_ATOMIC_H |
| #define _LINUX_RISCV_BITS_ATOMIC_H 1 |
| |
| #include <stdint.h> |
| |
| typedef int32_t atomic32_t; |
| typedef uint32_t uatomic32_t; |
| |
| typedef int64_t atomic64_t; |
| typedef uint64_t uatomic64_t; |
| |
| typedef intptr_t atomicptr_t; |
| typedef uintptr_t uatomicptr_t; |
| typedef intmax_t atomic_max_t; |
| typedef uintmax_t uatomic_max_t; |
| |
| #define atomic_full_barrier() __sync_synchronize () |
| |
| #ifdef __riscv_atomic |
| |
| # define __HAVE_64B_ATOMICS (__riscv_xlen >= 64) |
| # define USE_ATOMIC_COMPILER_BUILTINS 1 |
| # define ATOMIC_EXCHANGE_USES_CAS 0 |
| |
| /* Compare and exchange. |
| For all "bool" routines, we return FALSE if exchange succesful. */ |
| |
| # define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \ |
| ({ \ |
| typeof (*mem) __oldval = (oldval); \ |
| !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ |
| model, __ATOMIC_RELAXED); \ |
| }) |
| |
| # define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \ |
| ({ \ |
| typeof (*mem) __oldval = (oldval); \ |
| !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ |
| model, __ATOMIC_RELAXED); \ |
| }) |
| |
| # define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \ |
| ({ \ |
| typeof (*mem) __oldval = (oldval); \ |
| !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ |
| model, __ATOMIC_RELAXED); \ |
| }) |
| |
| # define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \ |
| ({ \ |
| typeof (*mem) __oldval = (oldval); \ |
| !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ |
| model, __ATOMIC_RELAXED); \ |
| }) |
| |
| # define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \ |
| ({ \ |
| typeof (*mem) __oldval = (oldval); \ |
| __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ |
| model, __ATOMIC_RELAXED); \ |
| __oldval; \ |
| }) |
| |
| # define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \ |
| ({ \ |
| typeof (*mem) __oldval = (oldval); \ |
| __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ |
| model, __ATOMIC_RELAXED); \ |
| __oldval; \ |
| }) |
| |
| # define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \ |
| ({ \ |
| typeof (*mem) __oldval = (oldval); \ |
| __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ |
| model, __ATOMIC_RELAXED); \ |
| __oldval; \ |
| }) |
| |
| # define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \ |
| ({ \ |
| typeof (*mem) __oldval = (oldval); \ |
| __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \ |
| model, __ATOMIC_RELAXED); \ |
| __oldval; \ |
| }) |
| |
| /* Atomic compare and exchange. */ |
| |
| # define atomic_compare_and_exchange_bool_acq(mem, new, old) \ |
| __atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \ |
| mem, new, old, __ATOMIC_ACQUIRE) |
| |
| # define atomic_compare_and_exchange_val_acq(mem, new, old) \ |
| __atomic_val_bysize (__arch_compare_and_exchange_val, int, \ |
| mem, new, old, __ATOMIC_ACQUIRE) |
| |
| # define atomic_compare_and_exchange_val_rel(mem, new, old) \ |
| __atomic_val_bysize (__arch_compare_and_exchange_val, int, \ |
| mem, new, old, __ATOMIC_RELEASE) |
| |
| /* Atomic exchange (without compare). */ |
| |
| # define __arch_exchange_8_int(mem, newval, model) \ |
| __atomic_exchange_n (mem, newval, model) |
| |
| # define __arch_exchange_16_int(mem, newval, model) \ |
| __atomic_exchange_n (mem, newval, model) |
| |
| # define __arch_exchange_32_int(mem, newval, model) \ |
| __atomic_exchange_n (mem, newval, model) |
| |
| # define __arch_exchange_64_int(mem, newval, model) \ |
| __atomic_exchange_n (mem, newval, model) |
| |
| # define atomic_exchange_acq(mem, value) \ |
| __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE) |
| |
| # define atomic_exchange_rel(mem, value) \ |
| __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE) |
| |
| /* Atomically add value and return the previous (unincremented) value. */ |
| |
| # define __arch_exchange_and_add_8_int(mem, value, model) \ |
| __atomic_fetch_add (mem, value, model) |
| |
| # define __arch_exchange_and_add_16_int(mem, value, model) \ |
| __atomic_fetch_add (mem, value, model) |
| |
| # define __arch_exchange_and_add_32_int(mem, value, model) \ |
| __atomic_fetch_add (mem, value, model) |
| |
| # define __arch_exchange_and_add_64_int(mem, value, model) \ |
| __atomic_fetch_add (mem, value, model) |
| |
| # define atomic_exchange_and_add_acq(mem, value) \ |
| __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \ |
| __ATOMIC_ACQUIRE) |
| |
| # define atomic_exchange_and_add_rel(mem, value) \ |
| __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \ |
| __ATOMIC_RELEASE) |
| |
| /* 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) |
| |
| # define atomic_bit_test_set(mem, bit) \ |
| ({ typeof (*mem) __mask = (typeof (*mem))1 << (bit); \ |
| asm_amo ("amoor", ".aq", mem, __mask) & __mask; }) |
| |
| # define catomic_exchange_and_add(mem, value) \ |
| atomic_exchange_and_add (mem, value) |
| # define catomic_max(mem, value) atomic_max (mem, value) |
| |
| #else /* __riscv_atomic */ |
| # error "ISAs that do not subsume the A extension are not supported" |
| #endif /* !__riscv_atomic */ |
| |
| #endif /* bits/atomic.h */ |