irqflags.h

Go to the documentation of this file.

#ifndef __ASM_ARM_IRQFLAGS_H
#define __ASM_ARM_IRQFLAGS_H

#ifdef __KERNEL__

#include <asm/ptrace.h>

/*
 * CPU interrupt mask handling.
 */
#if __LINUX_ARM_ARCH__ >= 6

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

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

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

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")
#else

/*
 * Save the current interrupt enable state & disable IRQs
 */
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
 */
static inline void arch_local_irq_enable(void)
{
    unsigned long temp;
    asm volatile(
        "   mrs %0, cpsr    @ arch_local_irq_enable\n"
        "   bic %0, %0, #128\n"
        "   msr cpsr_c, %0"
        : "=r" (temp)
        :
        : "memory", "cc");
}

/*
 * Disable IRQs
 */
static inline void arch_local_irq_disable(void)
{
    unsigned long temp;
    asm volatile(
        "   mrs %0, cpsr    @ arch_local_irq_disable\n"
        "   orr %0, %0, #128\n"
        "   msr cpsr_c, %0"
        : "=r" (temp)
        :
        : "memory", "cc");
}

/*
 * Enable FIQs
 */
#define local_fiq_enable()                  \
    ({                          \
        unsigned long temp;             \
    __asm__ __volatile__(                   \
    "mrs    %0, cpsr        @ stf\n"        \
"   bic %0, %0, #64\n"                  \
"   msr cpsr_c, %0"                 \
    : "=r" (temp)                       \
    :                           \
    : "memory", "cc");                  \
    })

/*
 * Disable FIQs
 */
#define local_fiq_disable()                 \
    ({                          \
        unsigned long temp;             \
    __asm__ __volatile__(                   \
    "mrs    %0, cpsr        @ clf\n"        \
"   orr %0, %0, #64\n"                  \
"   msr cpsr_c, %0"                 \
    : "=r" (temp)                       \
    :                           \
    : "memory", "cc");                  \
    })

#endif

/*
 * Save the current interrupt enable state.
 */
static inline unsigned long arch_local_save_flags(void)
{
    unsigned long flags;
    asm volatile(
        "   mrs %0, cpsr    @ local_save_flags"
        : "=r" (flags) : : "memory", "cc");
    return flags;
}

/*
 * restore saved IRQ & FIQ state
 */
static inline void arch_local_irq_restore(unsigned long flags)
{
    asm volatile(
        "   msr cpsr_c, %0  @ local_irq_restore"
        :
        : "r" (flags)
        : "memory", "cc");
}

static inline int arch_irqs_disabled_flags(unsigned long flags)
{
    return flags & PSR_I_BIT;
}

#endif
#endif