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說明：
在默認情況下，本文講述的都是ARMV8-aarch64架構，linux kernel 5.14

local_irq_enable()和local_irq_disable()的實現，其實就是操作的DAIF寄存器(PSTATE), 命令分別是

• msr daifclr, #3 //enable
• msr daifset, #3 //disable

(1)、 local_irq_disable()

(linux/include/linux/irqflags.h)#define local_irq_disable() do { raw_local_irq_disable(); } while (0)#define raw_local_irq_disable() arch_local_irq_disable()(linux/arch/arm64/include/asm/irqflags.h) static inline void arch_local_irq_disable(void) {if (system_has_prio_mask_debugging()) {u32 pmr = read_sysreg_s(SYS_ICC_PMR_EL1);WARN_ON_ONCE(pmr != GIC_PRIO_IRQON && pmr != GIC_PRIO_IRQOFF);}asm volatile(ALTERNATIVE("msr daifset, #3 // arch_local_irq_disable",__msr_s(SYS_ICC_PMR_EL1, "%0"),ARM64_HAS_IRQ_PRIO_MASKING):: "r" ((unsigned long) GIC_PRIO_IRQOFF): "memory"); }

(2)、 local_irq_enable()

(linux/include/linux/irqflags.h)#define local_irq_disable() do { raw_local_irq_disable(); } while (0)#define raw_local_irq_enable() arch_local_irq_enable()(linux/arch/arm64/include/asm/irqflags.h) static inline void arch_local_irq_enable(void) {if (system_has_prio_mask_debugging()) {u32 pmr = read_sysreg_s(SYS_ICC_PMR_EL1);WARN_ON_ONCE(pmr != GIC_PRIO_IRQON && pmr != GIC_PRIO_IRQOFF);}asm volatile(ALTERNATIVE("msr daifclr, #3 // arch_local_irq_enable",__msr_s(SYS_ICC_PMR_EL1, "%0"),ARM64_HAS_IRQ_PRIO_MASKING):: "r" ((unsigned long) GIC_PRIO_IRQON): "memory");pmr_sync(); }

總結

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