xref: /OK3568_Linux_fs/kernel/include/asm-generic/irq_regs.h (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */
2*4882a593Smuzhiyun /* Fallback per-CPU frame pointer holder
3*4882a593Smuzhiyun  *
4*4882a593Smuzhiyun  * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
5*4882a593Smuzhiyun  * Written by David Howells (dhowells@redhat.com)
6*4882a593Smuzhiyun  */
7*4882a593Smuzhiyun 
8*4882a593Smuzhiyun #ifndef _ASM_GENERIC_IRQ_REGS_H
9*4882a593Smuzhiyun #define _ASM_GENERIC_IRQ_REGS_H
10*4882a593Smuzhiyun 
11*4882a593Smuzhiyun #include <linux/percpu.h>
12*4882a593Smuzhiyun 
13*4882a593Smuzhiyun /*
14*4882a593Smuzhiyun  * Per-cpu current frame pointer - the location of the last exception frame on
15*4882a593Smuzhiyun  * the stack
16*4882a593Smuzhiyun  */
17*4882a593Smuzhiyun DECLARE_PER_CPU(struct pt_regs *, __irq_regs);
18*4882a593Smuzhiyun 
get_irq_regs(void)19*4882a593Smuzhiyun static inline struct pt_regs *get_irq_regs(void)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun 	return __this_cpu_read(__irq_regs);
22*4882a593Smuzhiyun }
23*4882a593Smuzhiyun 
set_irq_regs(struct pt_regs * new_regs)24*4882a593Smuzhiyun static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun 	struct pt_regs *old_regs;
27*4882a593Smuzhiyun 
28*4882a593Smuzhiyun 	old_regs = __this_cpu_read(__irq_regs);
29*4882a593Smuzhiyun 	__this_cpu_write(__irq_regs, new_regs);
30*4882a593Smuzhiyun 	return old_regs;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun 
33*4882a593Smuzhiyun #endif /* _ASM_GENERIC_IRQ_REGS_H */
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