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. */
35 static __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
46 static arch_local_irq_attributes unsigned long arch_local_save_flags(void)
47 {
48 return __arch_local_irq_stnsm(0xff);
49 }
50
51 static arch_local_irq_attributes unsigned long arch_local_irq_save(void)
52 {
53 return __arch_local_irq_stnsm(0xfc);
54 }
55
56 static __always_inline void arch_local_irq_disable(void)
57 {
58 arch_local_irq_save();
59 }
60
61 static arch_local_irq_attributes void arch_local_irq_enable_external(void)
62 {
63 __arch_local_irq_stosm(0x01);
64 }
65
66 static 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 */
72 static __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
79 static __always_inline bool arch_irqs_disabled_flags(unsigned long flags)
80 {
81 return !(flags & ARCH_IRQ_ENABLED);
82 }
83
84 static __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 */
90
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