arm: add nvic_disable_irq_sync()

commit 02d317a3f47853f6d2c4338a90257739cddd5b41
Author: Aidan MacDonald <[email protected]>
Date:   Sat Feb 7 14:20:06 2026 +0000

    arm: add nvic_disable_irq_sync()
    
    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

diff --git a/firmware/target/arm/nvic-arm.h b/firmware/target/arm/nvic-arm.h
index 57a16f43aa..f695279e8c 100644
--- a/firmware/target/arm/nvic-arm.h
+++ b/firmware/target/arm/nvic-arm.h
@@ -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;
-- 
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