Root/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 */
21DECLARE_PER_CPU(struct pt_regs *, __irq_regs);
22
23static inline struct pt_regs *get_irq_regs(void)
24{
25    return __get_cpu_var(__irq_regs);
26}
27
28static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
29{
30    struct pt_regs *old_regs, **pp_regs = &__get_cpu_var(__irq_regs);
31
32    old_regs = *pp_regs;
33    *pp_regs = new_regs;
34    return old_regs;
35}
36
37#endif /* _ASM_GENERIC_IRQ_REGS_H */
38

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