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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright IBM Corp. 2006, 2010
4 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
5 */
6
7#ifndef __ASM_IRQFLAGS_H
8#define __ASM_IRQFLAGS_H
9
10#include <linux/types.h>
11
12#define ARCH_IRQ_ENABLED (3UL << (BITS_PER_LONG - 8))
13
14/* store then OR system mask. */
15#define __arch_local_irq_stosm(__or) \
16({ \
17 unsigned long __mask; \
18 asm volatile( \
19 " stosm %0,%1" \
20 : "=Q" (__mask) : "i" (__or) : "memory"); \
21 __mask; \
22})
23
24/* store then AND system mask. */
25#define __arch_local_irq_stnsm(__and) \
26({ \
27 unsigned long __mask; \
28 asm volatile( \
29 " stnsm %0,%1" \
30 : "=Q" (__mask) : "i" (__and) : "memory"); \
31 __mask; \
32})
33
34/* set system mask. */
35static __always_inline void __arch_local_irq_ssm(unsigned long flags)
36{
37 asm volatile("ssm %0" : : "Q" (flags) : "memory");
38}
39
40#ifdef CONFIG_KMSAN
41#define arch_local_irq_attributes noinline notrace __no_sanitize_memory __maybe_unused
42#else
43#define arch_local_irq_attributes __always_inline
44#endif
45
46static arch_local_irq_attributes unsigned long arch_local_save_flags(void)
47{
48 return __arch_local_irq_stnsm(0xff);
49}
50
51static arch_local_irq_attributes unsigned long arch_local_irq_save(void)
52{
53 return __arch_local_irq_stnsm(0xfc);
54}
55
56static __always_inline void arch_local_irq_disable(void)
57{
58 arch_local_irq_save();
59}
60
61static arch_local_irq_attributes void arch_local_irq_enable_external(void)
62{
63 __arch_local_irq_stosm(0x01);
64}
65
66static arch_local_irq_attributes void arch_local_irq_enable(void)
67{
68 __arch_local_irq_stosm(0x03);
69}
70
71/* This only restores external and I/O interrupt state */
72static __always_inline void arch_local_irq_restore(unsigned long flags)
73{
74 /* only disabled->disabled and disabled->enabled is valid */
75 if (flags & ARCH_IRQ_ENABLED)
76 arch_local_irq_enable();
77}
78
79static __always_inline bool arch_irqs_disabled_flags(unsigned long flags)
80{
81 return !(flags & ARCH_IRQ_ENABLED);
82}
83
84static __always_inline bool arch_irqs_disabled(void)
85{
86 return arch_irqs_disabled_flags(arch_local_save_flags());
87}
88
89#endif /* __ASM_IRQFLAGS_H */