diff options
| -rw-r--r-- | include/sbi/riscv_atomic.h | 3 | ||||
| -rw-r--r-- | lib/sbi/riscv_atomic.c | 16 |
2 files changed, 19 insertions, 0 deletions
diff --git a/include/sbi/riscv_atomic.h b/include/sbi/riscv_atomic.h index 40efb68..8543f4d 100644 --- a/include/sbi/riscv_atomic.h +++ b/include/sbi/riscv_atomic.h @@ -35,6 +35,9 @@ long arch_atomic_xchg(atomic_t *atom, long newval); unsigned int atomic_raw_xchg_uint(volatile unsigned int *ptr, unsigned int newval); + +unsigned long atomic_raw_xchg_ulong(volatile unsigned long *ptr, + unsigned long newval); /** * Set a bit in an atomic variable and return the new value. * @nr : Bit to set. diff --git a/lib/sbi/riscv_atomic.c b/lib/sbi/riscv_atomic.c index 34bf522..996e893 100644 --- a/lib/sbi/riscv_atomic.c +++ b/lib/sbi/riscv_atomic.c @@ -175,6 +175,22 @@ unsigned int atomic_raw_xchg_uint(volatile unsigned int *ptr, #endif } +unsigned long atomic_raw_xchg_ulong(volatile unsigned long *ptr, + unsigned long newval) +{ + /* Atomically set new value and return old value. */ +#ifdef __riscv_atomic + /* + * The name of GCC built-in macro __sync_lock_test_and_set() + * is misleading. A more appropriate name for GCC built-in + * macro would be __sync_val_exchange(). + */ + return __sync_lock_test_and_set(ptr, newval); +#else + return xchg(ptr, newval); +#endif +} + #if (BITS_PER_LONG == 64) #define __AMO(op) "amo" #op ".d" #elif (BITS_PER_LONG == 32) |