include/asm-generic/irq_regs.h

   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  */
  21 DECLARE_PER_CPU(struct pt_regs *, __irq_regs);
  22
  23 static inline struct pt_regs *get_irq_regs(void)
  24 {
  25         return __this_cpu_read(__irq_regs);
  26 }
  27
  28 static 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 */