1 /*
2 * Copyright (c) 2015-2020 François Tigeot <ftigeot@wolfpond.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef _LINUX_IRQFLAGS_H_
28 #define _LINUX_IRQFLAGS_H_
29
30 #include <linux/typecheck.h>
31
32 static inline void
local_irq_disable(void)33 local_irq_disable(void)
34 {
35 __asm __volatile("cli": : :"memory");
36 }
37
38 static inline void
local_irq_enable(void)39 local_irq_enable(void)
40 {
41 __asm __volatile("sti": : :"memory");
42 }
43
44 static inline bool
irqs_disabled(void)45 irqs_disabled(void)
46 {
47 return !(read_rflags() & 0x200UL);
48 }
49
50 #define local_irq_save(flags) \
51 ({ \
52 flags = read_rflags(); \
53 local_irq_disable(); \
54 })
55
56 static inline void
local_irq_restore(unsigned long flags)57 local_irq_restore(unsigned long flags)
58 {
59 write_rflags(flags);
60 }
61
62 #endif /* _LINUX_IRQFLAGS_H_ */
63