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arm: add nvic_disable_irq_sync()

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Disabling an IRQ in the NVIC may not take effect right away;
if the IRQ is being disabled to implement a critical section
it's necessary to follow up with dsb + isb to serialize the
NVIC update. Add a helper function for doing this.

Change-Id: Iaaa238ad39997cc3c6d62867d265cf9e9e0e5c4b
This commit is contained in:
Aidan MacDonald 2026-02-07 14:20:06 +00:00 • committed by Solomon Peachy
parent 7c2800beb4
commit 02d317a3f4
1 changed files with 7 additions and 0 deletions
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7
firmware/target/arm/nvic-arm.h
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@ -43,6 +43,13 @@ static inline void nvic_disable_irq(int nr)
reg_var(CM_NVIC_ICER(reg)) = BIT_N(bit);
}
static inline void nvic_disable_irq_sync(int nr)
{
nvic_disable_irq(nr);
arm_dsb();
arm_isb();
}
static inline void nvic_set_pending_irq(int nr)
{
int reg = nr / 32;