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lib: Provide an atomic exchange function unsigned long

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Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Atish Patra
2019-08-14 18:02:13 -07:00
committed by Anup Patel
parent a88e424f6c
commit f6e13e0dd3
2 changed files with 19 additions and 0 deletions
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3
include/sbi/riscv_atomic.h
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@@ -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.

16
lib/sbi/riscv_atomic.c
View File

@@ -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)