| 1 |
13 |
serginhofr |
/* Low-level functions for atomic operations. RISC-V version.
|
| 2 |
|
|
Copyright (C) 2011-2014 Free Software Foundation, Inc.
|
| 3 |
|
|
|
| 4 |
|
|
Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
|
| 5 |
|
|
|
| 6 |
|
|
This file is part of the GNU C Library.
|
| 7 |
|
|
|
| 8 |
|
|
The GNU C Library is free software; you can redistribute it and/or
|
| 9 |
|
|
modify it under the terms of the GNU Lesser General Public
|
| 10 |
|
|
License as published by the Free Software Foundation; either
|
| 11 |
|
|
version 2.1 of the License, or (at your option) any later version.
|
| 12 |
|
|
|
| 13 |
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
| 14 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 15 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
| 16 |
|
|
Lesser General Public License for more details.
|
| 17 |
|
|
|
| 18 |
|
|
You should have received a copy of the GNU Lesser General Public
|
| 19 |
|
|
License along with the GNU C Library; if not, write to the Free
|
| 20 |
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
| 21 |
|
|
02111-1307 USA. */
|
| 22 |
|
|
|
| 23 |
|
|
#ifndef _RISCV_BITS_ATOMIC_H
|
| 24 |
|
|
#define _RISCV_BITS_ATOMIC_H 1
|
| 25 |
|
|
|
| 26 |
|
|
#include <inttypes.h>
|
| 27 |
|
|
|
| 28 |
|
|
typedef int32_t atomic32_t;
|
| 29 |
|
|
typedef uint32_t uatomic32_t;
|
| 30 |
|
|
typedef int_fast32_t atomic_fast32_t;
|
| 31 |
|
|
typedef uint_fast32_t uatomic_fast32_t;
|
| 32 |
|
|
|
| 33 |
|
|
typedef int64_t atomic64_t;
|
| 34 |
|
|
typedef uint64_t uatomic64_t;
|
| 35 |
|
|
typedef int_fast64_t atomic_fast64_t;
|
| 36 |
|
|
typedef uint_fast64_t uatomic_fast64_t;
|
| 37 |
|
|
|
| 38 |
|
|
typedef intptr_t atomicptr_t;
|
| 39 |
|
|
typedef uintptr_t uatomicptr_t;
|
| 40 |
|
|
typedef intmax_t atomic_max_t;
|
| 41 |
|
|
typedef uintmax_t uatomic_max_t;
|
| 42 |
|
|
|
| 43 |
|
|
#ifdef __riscv_atomic
|
| 44 |
|
|
|
| 45 |
|
|
#ifdef __riscv64
|
| 46 |
|
|
# define __HAVE_64B_ATOMICS 1
|
| 47 |
|
|
#else
|
| 48 |
|
|
# define __HAVE_64B_ATOMICS 0
|
| 49 |
|
|
#endif
|
| 50 |
|
|
|
| 51 |
|
|
#define USE_ATOMIC_COMPILER_BUILTINS 1
|
| 52 |
|
|
|
| 53 |
|
|
#define asm_amo(which, ordering, mem, value) ({ \
|
| 54 |
|
|
typeof(*mem) __tmp; \
|
| 55 |
|
|
if (sizeof(__tmp) == 4) \
|
| 56 |
|
|
asm volatile (which ".w" ordering "\t%0, %z2, %1" \
|
| 57 |
|
|
: "=r"(__tmp), "+A"(*(mem)) \
|
| 58 |
|
|
: "rJ"(value)); \
|
| 59 |
|
|
else if (sizeof(__tmp) == 8) \
|
| 60 |
|
|
asm volatile (which ".d" ordering "\t%0, %z2, %1" \
|
| 61 |
|
|
: "=r"(__tmp), "+A"(*(mem)) \
|
| 62 |
|
|
: "rJ"(value)); \
|
| 63 |
|
|
else \
|
| 64 |
|
|
abort(); \
|
| 65 |
|
|
__tmp; })
|
| 66 |
|
|
|
| 67 |
|
|
/* Atomic compare and exchange. */
|
| 68 |
|
|
|
| 69 |
|
|
#define atomic_cas(ordering, mem, newval, oldval) ({ \
|
| 70 |
|
|
typeof(*mem) __tmp; \
|
| 71 |
|
|
int __tmp2; \
|
| 72 |
|
|
if (sizeof(__tmp) == 4) \
|
| 73 |
|
|
asm volatile ("1: lr.w" ordering "\t%0, %2\n" \
|
| 74 |
|
|
"bne\t%0, %z4, 1f\n" \
|
| 75 |
|
|
"sc.w" ordering "\t%1, %z3, %2\n" \
|
| 76 |
|
|
"bnez\t%1, 1b\n" \
|
| 77 |
|
|
"1:" \
|
| 78 |
|
|
: "=&r"(__tmp), "=&r"(__tmp2), "+A"(*(mem)) \
|
| 79 |
|
|
: "rJ"(newval), "rJ"(oldval)); \
|
| 80 |
|
|
else if (sizeof(__tmp) == 8) \
|
| 81 |
|
|
asm volatile ("1: lr.d" ordering "\t%0, %2\n" \
|
| 82 |
|
|
"bne\t%0, %z4, 1f\n" \
|
| 83 |
|
|
"sc.d" ordering "\t%1, %z3, %2\n" \
|
| 84 |
|
|
"bnez\t%1, 1b\n" \
|
| 85 |
|
|
"1:" \
|
| 86 |
|
|
: "=&r"(__tmp), "=&r"(__tmp2), "+A"(*(mem)) \
|
| 87 |
|
|
: "rJ"(newval), "rJ"(oldval)); \
|
| 88 |
|
|
else \
|
| 89 |
|
|
abort(); \
|
| 90 |
|
|
__tmp; })
|
| 91 |
|
|
|
| 92 |
|
|
#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
|
| 93 |
|
|
atomic_cas(".aq", mem, newval, oldval)
|
| 94 |
|
|
|
| 95 |
|
|
#define atomic_compare_and_exchange_val_rel(mem, newval, oldval) \
|
| 96 |
|
|
atomic_cas(".rl", mem, newval, oldval)
|
| 97 |
|
|
|
| 98 |
|
|
/* Atomic exchange (without compare). */
|
| 99 |
|
|
|
| 100 |
|
|
#define atomic_exchange_acq(mem, value) asm_amo("amoswap", ".aq", mem, value)
|
| 101 |
|
|
#define atomic_exchange_rel(mem, value) asm_amo("amoswap", ".rl", mem, value)
|
| 102 |
|
|
|
| 103 |
|
|
|
| 104 |
|
|
/* Atomically add value and return the previous (unincremented) value. */
|
| 105 |
|
|
|
| 106 |
|
|
#define atomic_exchange_and_add(mem, value) asm_amo("amoadd", "", mem, value)
|
| 107 |
|
|
|
| 108 |
|
|
#define atomic_max(mem, value) asm_amo("amomaxu", "", mem, value)
|
| 109 |
|
|
#define atomic_min(mem, value) asm_amo("amominu", "", mem, value)
|
| 110 |
|
|
|
| 111 |
|
|
#define atomic_bit_test_set(mem, bit) \
|
| 112 |
|
|
({ typeof(*mem) __mask = (typeof(*mem))1 << (bit); \
|
| 113 |
|
|
asm_amo("amoor", "", mem, __mask) & __mask; })
|
| 114 |
|
|
|
| 115 |
|
|
#define atomic_full_barrier() __sync_synchronize()
|
| 116 |
|
|
|
| 117 |
|
|
#define catomic_exchange_and_add(mem, value) \
|
| 118 |
|
|
atomic_exchange_and_add(mem, value)
|
| 119 |
|
|
#define catomic_max(mem, value) atomic_max(mem, value)
|
| 120 |
|
|
|
| 121 |
|
|
#else /* __riscv_atomic */
|
| 122 |
|
|
|
| 123 |
|
|
#define __HAVE_64B_ATOMICS 0
|
| 124 |
|
|
#define USE_ATOMIC_COMPILER_BUILTINS 0
|
| 125 |
|
|
|
| 126 |
|
|
#endif /* !__riscv_atomic */
|
| 127 |
|
|
|
| 128 |
|
|
#endif /* bits/atomic.h */
|
