| 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 */ |