diff options
| author | Atish Patra <atish.patra@wdc.com> | 2019-08-14 18:02:13 -0700 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2019-08-16 08:42:52 +0530 |
| commit | f6e13e0dd30b164eb444bc08c70fa1b8576e0bca (patch) | |
| tree | 35ab39e652592d5456b85ae00855a791e8a4cb3f /lib/sbi/riscv_atomic.c | |
| parent | a88e424f6c3a42a38e9395726d9fd4e50a96abd2 (diff) | |
lib: Provide an atomic exchange function unsigned long
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Diffstat (limited to 'lib/sbi/riscv_atomic.c')
| -rw-r--r-- | lib/sbi/riscv_atomic.c | 16 |
1 files changed, 16 insertions, 0 deletions
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) |