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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  */
 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 */
 38 

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