linux/include/asm-generic/irq_regs.h
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   1/* Fallback per-CPU frame pointer holder
   2 *
   3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12#ifndef _ASM_GENERIC_IRQ_REGS_H
  13#define _ASM_GENERIC_IRQ_REGS_H
  14
  15#include <linux/percpu.h>
  16
  17/*
  18 * Per-cpu current frame pointer - the location of the last exception frame on
  19 * the stack
  20 */
  21DECLARE_PER_CPU(struct pt_regs *, __irq_regs);
  22
  23static inline struct pt_regs *get_irq_regs(void)
  24{
  25        return __this_cpu_read(__irq_regs);
  26}
  27
  28static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
  29{
  30        struct pt_regs *old_regs;
  31
  32        old_regs = __this_cpu_read(__irq_regs);
  33        __this_cpu_write(__irq_regs, new_regs);
  34        return old_regs;
  35}
  36
  37#endif /* _ASM_GENERIC_IRQ_REGS_H */
  38
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