LXR linux/arch/arm64/include/asm/irqflags.h

   1/*
   2 * Copyright (C) 2012 ARM Ltd.
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16#ifndef __ASM_IRQFLAGS_H
  17#define __ASM_IRQFLAGS_H
  18
  19#ifdef __KERNEL__
  20
  21#include <asm/ptrace.h>
  22
  23/*
  24 * CPU interrupt mask handling.
  25 */
  26static inline unsigned long arch_local_irq_save(void)
  27{
  28        unsigned long flags;
  29        asm volatile(
  30                "mrs    %0, daif                // arch_local_irq_save\n"
  31                "msr    daifset, #2"
  32                : "=r" (flags)
  33                :
  34                : "memory");
  35        return flags;
  36}
  37
  38static inline void arch_local_irq_enable(void)
  39{
  40        asm volatile(
  41                "msr    daifclr, #2             // arch_local_irq_enable"
  42                :
  43                :
  44                : "memory");
  45}
  46
  47static inline void arch_local_irq_disable(void)
  48{
  49        asm volatile(
  50                "msr    daifset, #2             // arch_local_irq_disable"
  51                :
  52                :
  53                : "memory");
  54}
  55
  56#define local_fiq_enable()      asm("msr        daifclr, #1" : : : "memory")
  57#define local_fiq_disable()     asm("msr        daifset, #1" : : : "memory")
  58
  59/*
  60 * Save the current interrupt enable state.
  61 */
  62static inline unsigned long arch_local_save_flags(void)
  63{
  64        unsigned long flags;
  65        asm volatile(
  66                "mrs    %0, daif                // arch_local_save_flags"
  67                : "=r" (flags)
  68                :
  69                : "memory");
  70        return flags;
  71}
  72
  73/*
  74 * restore saved IRQ state
  75 */
  76static inline void arch_local_irq_restore(unsigned long flags)
  77{
  78        asm volatile(
  79                "msr    daif, %0                // arch_local_irq_restore"
  80        :
  81        : "r" (flags)
  82        : "memory");
  83}
  84
  85static inline int arch_irqs_disabled_flags(unsigned long flags)
  86{
  87        return flags & PSR_I_BIT;
  88}
  89
  90#endif
  91#endif
  92