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7d12e780 DH |
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 | { | |
909ea964 | 25 | return __this_cpu_read(__irq_regs); |
7d12e780 DH |
26 | } |
27 | ||
28 | static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs) | |
29 | { | |
909ea964 | 30 | struct pt_regs *old_regs; |
7d12e780 | 31 | |
909ea964 CL |
32 | old_regs = __this_cpu_read(__irq_regs); |
33 | __this_cpu_write(__irq_regs, new_regs); | |
7d12e780 DH |
34 | return old_regs; |
35 | } | |
36 | ||
37 | #endif /* _ASM_GENERIC_IRQ_REGS_H */ |