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 #if defined(CONFIG_KMSAN) && !defined(__DECOMPRESSOR) 41 unsigned long arch_local_save_flags(void); 42 unsigned long arch_local_irq_save(void); 43 void arch_local_irq_enable_external(void); 44 void arch_local_irq_enable(void); 45 #else 46 #define arch_local_save_flags __arch_local_save_flags 47 #define arch_local_irq_save __arch_local_irq_save 48 #define arch_local_irq_enable_external __arch_local_irq_enable_external 49 #define arch_local_irq_enable __arch_local_irq_enable 50 #endif 51 52 static __always_inline unsigned long __arch_local_save_flags(void) 53 { 54 return __arch_local_irq_stnsm(0xff); 55 } 56 57 static __always_inline unsigned long __arch_local_irq_save(void) 58 { 59 return __arch_local_irq_stnsm(0xfc); 60 } 61 62 static __always_inline void arch_local_irq_disable(void) 63 { 64 arch_local_irq_save(); 65 } 66 67 static __always_inline void __arch_local_irq_enable_external(void) 68 { 69 __arch_local_irq_stosm(0x01); 70 } 71 72 static __always_inline void __arch_local_irq_enable(void) 73 { 74 __arch_local_irq_stosm(0x03); 75 } 76 77 /* This only restores external and I/O interrupt state */ 78 static __always_inline void arch_local_irq_restore(unsigned long flags) 79 { 80 /* only disabled->disabled and disabled->enabled is valid */ 81 if (flags & ARCH_IRQ_ENABLED) 82 arch_local_irq_enable(); 83 } 84 85 static __always_inline bool arch_irqs_disabled_flags(unsigned long flags) 86 { 87 return !(flags & ARCH_IRQ_ENABLED); 88 } 89 90 static __always_inline bool arch_irqs_disabled(void) 91 { 92 return arch_irqs_disabled_flags(arch_local_save_flags()); 93 } 94 95 #endif /* __ASM_IRQFLAGS_H */ 96