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