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arch/riscv: replace atomic operations to AMO #12232

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Merged
masayuki2009 merged 1 commit into from
Apr 25, 2024
Merged

arch/riscv: replace atomic operations to AMO #12232

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21 changes: 5 additions & 16 deletions arch/risc-v/src/common/riscv_testset.S
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Original file line number Diff line number Diff line change
Expand Up @@ -32,11 +32,9 @@
****************************************************************************/

#ifdef CONFIG_ARCH_RV32
#define LR_INST lr.w
#define SC_INST sc.w
#define AMOSWAP amoswap.w
#else
#define LR_INST lr.d
#define SC_INST sc.d
#define AMOSWAP amoswap.d
#endif

/****************************************************************************
Expand Down Expand Up @@ -86,18 +84,9 @@

up_testset:

li a1, SP_LOCKED

/* Test if the spinlock is locked or not */

retry:
LR_INST a2, (a0) /* Test if spinlock is locked or not */
beq a2, a1, locked /* Already locked? Go to locked: */

/* Not locked ... attempt to lock it */

SC_INST a2, a1, (a0) /* Attempt to set the locked state (a1) to (a0) */
bnez a2, retry /* a2 will not be zero, if sc.b failed, try again */
li a1, SP_LOCKED
AMOSWAP a2, a1, (a0) /* Attempt to acquire spinlock atomically */
beq a2, a1, locked /* Already locked? Go to locked: */

/* Lock acquired -- return SP_UNLOCKED */

Expand Down