| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 */ |