arch/arm/include/asm/irqflags.h

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

File Facts

System
Linux kernel
Corpus path
arch/arm/include/asm/irqflags.h
Extension
.h
Size
3969 bytes
Lines
188
Domain
Architecture Layer
Bucket
arch/arm
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_ARM_IRQFLAGS_H
#define __ASM_ARM_IRQFLAGS_H

#ifdef __KERNEL__

#include <asm/ptrace.h>

/*
 * CPU interrupt mask handling.
 */
#ifdef CONFIG_CPU_V7M
#define IRQMASK_REG_NAME_R "primask"
#define IRQMASK_REG_NAME_W "primask"
#define IRQMASK_I_BIT	1
#else
#define IRQMASK_REG_NAME_R "cpsr"
#define IRQMASK_REG_NAME_W "cpsr_c"
#define IRQMASK_I_BIT	PSR_I_BIT
#endif

#if __LINUX_ARM_ARCH__ >= 6

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

	asm volatile(
		"	mrs	%0, " IRQMASK_REG_NAME_R "	@ arch_local_irq_save\n"
		"	cpsid	i"
		: "=r" (flags) : : "memory", "cc");
	return flags;
}

#define arch_local_irq_enable arch_local_irq_enable
static inline void arch_local_irq_enable(void)
{
	asm volatile(
		"	cpsie i			@ arch_local_irq_enable"
		:
		:
		: "memory", "cc");
}

#define arch_local_irq_disable arch_local_irq_disable
static inline void arch_local_irq_disable(void)
{
	asm volatile(
		"	cpsid i			@ arch_local_irq_disable"
		:
		:
		: "memory", "cc");
}

#define local_fiq_enable()  __asm__("cpsie f	@ __stf" : : : "memory", "cc")
#define local_fiq_disable() __asm__("cpsid f	@ __clf" : : : "memory", "cc")

#ifndef CONFIG_CPU_V7M
#define local_abt_enable()  __asm__("cpsie a	@ __sta" : : : "memory", "cc")
#define local_abt_disable() __asm__("cpsid a	@ __cla" : : : "memory", "cc")
#else
#define local_abt_enable()	do { } while (0)
#define local_abt_disable()	do { } while (0)
#endif
#else

/*
 * Save the current interrupt enable state & disable IRQs
 */
#define arch_local_irq_save arch_local_irq_save
static inline unsigned long arch_local_irq_save(void)
{
	unsigned long flags, temp;

	asm volatile(
		"	mrs	%0, cpsr	@ arch_local_irq_save\n"
		"	orr	%1, %0, #128\n"
		"	msr	cpsr_c, %1"
		: "=r" (flags), "=r" (temp)
		:
		: "memory", "cc");
	return flags;
}

/*
 * Enable IRQs
 */
#define arch_local_irq_enable arch_local_irq_enable
static inline void arch_local_irq_enable(void)
{

Annotation

Implementation Notes