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spinlock: Introduce SP_WFE() and SP_SEV()

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Summary:
- This commit introduces SP_WFE() and SP_SEV() to be used for spinlock
- Also, use wfe/sev instructions for ARMV7-A to reduce power consumption

Impact:
- ARMV7-a SMP only

Testing:
- sabre-6quad:smp (QEMU, dev board)
- maix-bit:smp, esp32-devkitc:smp, spresense:smp sim:smp (compile only)

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
This commit is contained in:
Masayuki Ishikawa
2020-12-07 21:04:16 +09:00
committed by Xiang Xiao
parent 21cb7935c5
commit 6158b6b77b
4 changed files with 24 additions and 0 deletions
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sched/semaphore/spinlock.c
+4
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@@ -89,6 +89,7 @@ void spin_lock(FAR volatile spinlock_t *lock)
while (up_testset(lock) == SP_LOCKED)
{
SP_DSB();
SP_WFE();
}
#ifdef CONFIG_SCHED_INSTRUMENTATION_SPINLOCKS
@@ -126,6 +127,7 @@ void spin_lock_wo_note(FAR volatile spinlock_t *lock)
while (up_testset(lock) == SP_LOCKED)
{
SP_DSB();
SP_WFE();
}
SP_DMB();
@@ -241,6 +243,7 @@ void spin_unlock(FAR volatile spinlock_t *lock)
SP_DMB();
*lock = SP_UNLOCKED;
SP_DSB();
SP_SEV();
}
#endif
@@ -269,6 +272,7 @@ void spin_unlock_wo_note(FAR volatile spinlock_t *lock)
SP_DMB();
*lock = SP_UNLOCKED;
SP_DSB();
SP_SEV();
}
/****************************************************************************