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Linux kernel mirror (for testing)
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kernel
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linux
1/*
2 * Copyright IBM Corp. 2006, 2010
3 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
4 */
5
6#ifndef __ASM_IRQFLAGS_H
7#define __ASM_IRQFLAGS_H
8
9#include <linux/types.h>
10
11#define ARCH_IRQ_ENABLED (3UL << (BITS_PER_LONG - 8))
12
13/* store then OR system mask. */
14#define __arch_local_irq_stosm(__or) \
15({ \
16 unsigned long __mask; \
17 asm volatile( \
18 " stosm %0,%1" \
19 : "=Q" (__mask) : "i" (__or) : "memory"); \
20 __mask; \
21})
22
23/* store then AND system mask. */
24#define __arch_local_irq_stnsm(__and) \
25({ \
26 unsigned long __mask; \
27 asm volatile( \
28 " stnsm %0,%1" \
29 : "=Q" (__mask) : "i" (__and) : "memory"); \
30 __mask; \
31})
32
33/* set system mask. */
34static inline notrace void __arch_local_irq_ssm(unsigned long flags)
35{
36 asm volatile("ssm %0" : : "Q" (flags) : "memory");
37}
38
39static inline notrace unsigned long arch_local_save_flags(void)
40{
41 return __arch_local_irq_stnsm(0xff);
42}
43
44static inline notrace unsigned long arch_local_irq_save(void)
45{
46 return __arch_local_irq_stnsm(0xfc);
47}
48
49static inline notrace void arch_local_irq_disable(void)
50{
51 arch_local_irq_save();
52}
53
54static inline notrace void arch_local_irq_enable(void)
55{
56 __arch_local_irq_stosm(0x03);
57}
58
59/* This only restores external and I/O interrupt state */
60static inline notrace void arch_local_irq_restore(unsigned long flags)
61{
62 /* only disabled->disabled and disabled->enabled is valid */
63 if (flags & ARCH_IRQ_ENABLED)
64 arch_local_irq_enable();
65}
66
67static inline notrace bool arch_irqs_disabled_flags(unsigned long flags)
68{
69 return !(flags & ARCH_IRQ_ENABLED);
70}
71
72static inline notrace bool arch_irqs_disabled(void)
73{
74 return arch_irqs_disabled_flags(arch_local_save_flags());
75}
76
77#endif /* __ASM_IRQFLAGS_H */