arch/mips/include/asm/irqflags.h

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

File Facts

System
Linux kernel
Corpus path
arch/mips/include/asm/irqflags.h
Extension
.h
Size
4208 bytes
Lines
186
Domain
Architecture Layer
Bucket
arch/mips
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 _ASM_IRQFLAGS_H
#define _ASM_IRQFLAGS_H

#ifndef __ASSEMBLER__

#include <linux/compiler.h>
#include <linux/stringify.h>
#include <asm/compiler.h>
#include <asm/hazards.h>

#if defined(CONFIG_CPU_HAS_DIEI)

static inline void arch_local_irq_disable(void)
{
	__asm__ __volatile__(
	"	.set	push						\n"
	"	.set	noat						\n"
	"	di							\n"
	"	" __stringify(__irq_disable_hazard) "			\n"
	"	.set	pop						\n"
	: /* no outputs */
	: /* no inputs */
	: "memory");
}

static inline unsigned long arch_local_irq_save(void)
{
	unsigned long flags;

	asm __volatile__(
	"	.set	push						\n"
	"	.set	reorder						\n"
	"	.set	noat						\n"
#if defined(CONFIG_CPU_LOONGSON64) || defined(CONFIG_CPU_LOONGSON32)
	"	mfc0	%[flags], $12					\n"
	"	di							\n"
#else
	"	di	%[flags]					\n"
#endif
	"	andi	%[flags], 1					\n"
	"	" __stringify(__irq_disable_hazard) "			\n"
	"	.set	pop						\n"
	: [flags] "=r" (flags)
	: /* no inputs */
	: "memory");

	return flags;
}

static inline void arch_local_irq_restore(unsigned long flags)
{
	unsigned long __tmp1;

	__asm__ __volatile__(
	"	.set	push						\n"
	"	.set	noreorder					\n"
	"	.set	noat						\n"
#if defined(CONFIG_IRQ_MIPS_CPU)
	/*
	 * Slow, but doesn't suffer from a relatively unlikely race
	 * condition we're having since days 1.
	 */
	"	beqz	%[flags], 1f					\n"
	"	di							\n"
	"	ei							\n"
	"1:								\n"
#else
	/*
	 * Fast, dangerous.  Life is fun, life is good.
	 */
	"	mfc0	$1, $12						\n"
	"	ins	$1, %[flags], 0, 1				\n"
	"	mtc0	$1, $12						\n"
#endif
	"	" __stringify(__irq_disable_hazard) "			\n"
	"	.set	pop						\n"
	: [flags] "=r" (__tmp1)
	: "0" (flags)
	: "memory");
}

#else
/* Functions that require preempt_{dis,en}able() are in mips-atomic.c */
void arch_local_irq_disable(void);
unsigned long arch_local_irq_save(void);
void arch_local_irq_restore(unsigned long flags);
#endif /* CONFIG_CPU_HAS_DIEI */

static inline void arch_local_irq_enable(void)
{

Annotation

Implementation Notes