1/*
2 * Copyright (C) 2012 ARM Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15 */
16#ifndef __ASM_IRQFLAGS_H
17#define __ASM_IRQFLAGS_H
18
19#ifdef __KERNEL__
20
21#include <asm/ptrace.h>
22
23/*
24 * CPU interrupt mask handling.
25 */
26static inline unsigned long arch_local_irq_save(void)
27{
28	unsigned long flags;
29	asm volatile(
30		"mrs	%0, daif		// arch_local_irq_save\n"
31		"msr	daifset, #2"
32		: "=r" (flags)
33		:
34		: "memory");
35	return flags;
36}
37
38static inline void arch_local_irq_enable(void)
39{
40	asm volatile(
41		"msr	daifclr, #2		// arch_local_irq_enable"
42		:
43		:
44		: "memory");
45}
46
47static inline void arch_local_irq_disable(void)
48{
49	asm volatile(
50		"msr	daifset, #2		// arch_local_irq_disable"
51		:
52		:
53		: "memory");
54}
55
56#define local_fiq_enable()	asm("msr	daifclr, #1" : : : "memory")
57#define local_fiq_disable()	asm("msr	daifset, #1" : : : "memory")
58
59#define local_async_enable()	asm("msr	daifclr, #4" : : : "memory")
60#define local_async_disable()	asm("msr	daifset, #4" : : : "memory")
61
62/*
63 * Save the current interrupt enable state.
64 */
65static inline unsigned long arch_local_save_flags(void)
66{
67	unsigned long flags;
68	asm volatile(
69		"mrs	%0, daif		// arch_local_save_flags"
70		: "=r" (flags)
71		:
72		: "memory");
73	return flags;
74}
75
76/*
77 * restore saved IRQ state
78 */
79static inline void arch_local_irq_restore(unsigned long flags)
80{
81	asm volatile(
82		"msr	daif, %0		// arch_local_irq_restore"
83	:
84	: "r" (flags)
85	: "memory");
86}
87
88static inline int arch_irqs_disabled_flags(unsigned long flags)
89{
90	return flags & PSR_I_BIT;
91}
92
93/*
94 * save and restore debug state
95 */
96#define local_dbg_save(flags)						\
97	do {								\
98		typecheck(unsigned long, flags);			\
99		asm volatile(						\
100		"mrs    %0, daif		// local_dbg_save\n"	\
101		"msr    daifset, #8"					\
102		: "=r" (flags) : : "memory");				\
103	} while (0)
104
105#define local_dbg_restore(flags)					\
106	do {								\
107		typecheck(unsigned long, flags);			\
108		asm volatile(						\
109		"msr    daif, %0		// local_dbg_restore\n"	\
110		: : "r" (flags) : "memory");				\
111	} while (0)
112
113#define local_dbg_enable()	asm("msr	daifclr, #8" : : : "memory")
114#define local_dbg_disable()	asm("msr	daifset, #8" : : : "memory")
115
116#endif
117#endif
118