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lib: Add atomic bit set/clear operations.

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Add addtional functionlities for set/clear bits
atomically.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Atish Patra
2019-01-20 23:23:28 -08:00
committed by Anup Patel
parent 784a4657c0
commit 312b6bf32f
5 changed files with 179 additions and 0 deletions
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28
include/sbi/riscv_atomic.h
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@@ -34,5 +34,33 @@ long arch_atomic_xchg(atomic_t *atom, long newval);
unsigned int atomic_raw_xchg_uint(volatile unsigned int *ptr,
unsigned int newval);
/**
* Set a bit in an atomic variable and return the new value.
* @nr : Bit to set.
* @atom: atomic variable to modify
*/
int atomic_set_bit(int nr, atomic_t *atom);
/**
* Clear a bit in an atomic variable and return the new value.
* @nr : Bit to set.
* @atom: atomic variable to modify
*/
int atomic_clear_bit(int nr, atomic_t *atom);
/**
* Set a bit in any address and return the new value .
* @nr : Bit to set.
* @addr: Address to modify
*/
int atomic_raw_set_bit(int nr, volatile unsigned long *addr);
/**
* Clear a bit in any address and return the new value .
* @nr : Bit to set.
* @addr: Address to modify
*/
int atomic_raw_clear_bit(int nr, volatile unsigned long *addr);
#endif