1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * arch/arm/include/asm/fiq.h
4 *
5 * Support for FIQ on ARM architectures.
6 * Written by Philip Blundell <philb@gnu.org>, 1998
7 * Re-written by Russell King
8 *
9 * NOTE: The FIQ mode registers are not magically preserved across
10 * suspend/resume.
11 *
12 * Drivers which require these registers to be preserved across power
13 * management operations must implement appropriate suspend/resume handlers to
14 * save and restore them.
15 */
16
17 #ifndef __ASM_FIQ_H
18 #define __ASM_FIQ_H
19
20 #include <asm/ptrace.h>
21
22 struct fiq_handler {
23 struct fiq_handler *next;
24 /* Name
25 */
26 const char *name;
27 /* Called to ask driver to relinquish/
28 * reacquire FIQ
29 * return zero to accept, or -<errno>
30 */
31 int (*fiq_op)(void *, int relinquish);
32 /* data for the relinquish/reacquire functions
33 */
34 void *dev_id;
35 };
36
37 extern int claim_fiq(struct fiq_handler *f);
38 extern void release_fiq(struct fiq_handler *f);
39 extern void set_fiq_handler(void *start, unsigned int length);
40 extern void enable_fiq(int fiq);
41 extern void disable_fiq(int fiq);
42
43 /* helpers defined in fiqasm.S: */
44 extern void __set_fiq_regs(unsigned long const *regs);
45 extern void __get_fiq_regs(unsigned long *regs);
46
47 static inline void set_fiq_regs(struct pt_regs const *regs)
48 {
49 __set_fiq_regs(®s->ARM_r8);
50 }
51
52 static inline void get_fiq_regs(struct pt_regs *regs)
53 {
54 __get_fiq_regs(®s->ARM_r8);
55 }
56
57 #endif
58
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.