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. */ __arch_local_irq_ssm(unsigned long flags)35static __always_inline void __arch_local_irq_ssm(unsigned long flags) 36 { 37 asm volatile("ssm %0" : : "Q" (flags) : "memory"); 38 } 39 arch_local_save_flags(void)40static __always_inline unsigned long arch_local_save_flags(void) 41 { 42 return __arch_local_irq_stnsm(0xff); 43 } 44 arch_local_irq_save(void)45static __always_inline unsigned long arch_local_irq_save(void) 46 { 47 return __arch_local_irq_stnsm(0xfc); 48 } 49 arch_local_irq_disable(void)50static __always_inline void arch_local_irq_disable(void) 51 { 52 arch_local_irq_save(); 53 } 54 arch_local_irq_enable(void)55static __always_inline void arch_local_irq_enable(void) 56 { 57 __arch_local_irq_stosm(0x03); 58 } 59 60 /* This only restores external and I/O interrupt state */ arch_local_irq_restore(unsigned long flags)61static __always_inline void arch_local_irq_restore(unsigned long flags) 62 { 63 /* only disabled->disabled and disabled->enabled is valid */ 64 if (flags & ARCH_IRQ_ENABLED) 65 arch_local_irq_enable(); 66 } 67 arch_irqs_disabled_flags(unsigned long flags)68static __always_inline bool arch_irqs_disabled_flags(unsigned long flags) 69 { 70 return !(flags & ARCH_IRQ_ENABLED); 71 } 72 arch_irqs_disabled(void)73static __always_inline bool arch_irqs_disabled(void) 74 { 75 return arch_irqs_disabled_flags(arch_local_save_flags()); 76 } 77 78 #endif /* __ASM_IRQFLAGS_H */ 79