arch/parisc/include/asm/irqflags.h

Source file repositories/reference/linux-study-clean/arch/parisc/include/asm/irqflags.h

File Facts

System
Linux kernel
Corpus path
arch/parisc/include/asm/irqflags.h
Extension
.h
Size
1252 bytes
Lines
53
Domain
Architecture Layer
Bucket
arch/parisc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __PARISC_IRQFLAGS_H
#define __PARISC_IRQFLAGS_H

#include <linux/types.h>
#include <asm/psw.h>

static inline unsigned long arch_local_save_flags(void)
{
	unsigned long flags;
	asm volatile("ssm 0, %0" : "=r" (flags) : : "memory");
	return flags;
}

static inline void arch_local_irq_disable(void)
{
	asm volatile("rsm %0,%%r0\n" : : "i" (PSW_I) : "memory");
}

static inline void arch_local_irq_enable(void)
{
	asm volatile("ssm %0,%%r0\n" : : "i" (PSW_I) : "memory");
}

static inline unsigned long arch_local_irq_save(void)
{
	unsigned long flags;
	asm volatile("rsm %1,%0" : "=r" (flags) : "i" (PSW_I) : "memory");
	return flags;
}

static inline void arch_local_irq_restore(unsigned long flags)
{
	/* warn if IRQs are on although they should be off */
	if (IS_ENABLED(CONFIG_LIGHTWEIGHT_SPINLOCK_CHECK))
		if (arch_local_save_flags() & PSW_I)
			asm volatile("break 6,6\n"); /*  SPINLOCK_BREAK_INSN */

	asm volatile("mtsm %0" : : "r" (flags) : "memory");
}

static inline bool arch_irqs_disabled_flags(unsigned long flags)
{
	return (flags & PSW_I) == 0;
}

static inline bool arch_irqs_disabled(void)
{
	return arch_irqs_disabled_flags(arch_local_save_flags());
}

#endif /* __PARISC_IRQFLAGS_H */

Annotation

Implementation Notes