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