1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * IRQ flags defines. 4 * 5 * Copyright (C) 1998-2003 Hewlett-Packard Co 6 * David Mosberger-Tang <davidm@hpl.hp.com> 7 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com> 8 * Copyright (C) 1999 Don Dugger <don.dugger@intel.com> 9 */ 10 11 #ifndef _ASM_IA64_IRQFLAGS_H 12 #define _ASM_IA64_IRQFLAGS_H 13 14 #include <asm/pal.h> 15 #include <asm/kregs.h> 16 17 #ifdef CONFIG_IA64_DEBUG_IRQ 18 extern unsigned long last_cli_ip; 19 static inline void arch_maybe_save_ip(unsigned long flags) 20 { 21 if (flags & IA64_PSR_I) 22 last_cli_ip = ia64_getreg(_IA64_REG_IP); 23 } 24 #else 25 #define arch_maybe_save_ip(flags) do {} while (0) 26 #endif 27 28 /* 29 * - clearing psr.i is implicitly serialized (visible by next insn) 30 * - setting psr.i requires data serialization 31 * - we need a stop-bit before reading PSR because we sometimes 32 * write a floating-point register right before reading the PSR 33 * and that writes to PSR.mfl 34 */ 35 36 static inline unsigned long arch_local_save_flags(void) 37 { 38 ia64_stop(); 39 #ifdef CONFIG_PARAVIRT 40 return ia64_get_psr_i(); 41 #else 42 return ia64_getreg(_IA64_REG_PSR); 43 #endif 44 } 45 46 static inline unsigned long arch_local_irq_save(void) 47 { 48 unsigned long flags = arch_local_save_flags(); 49 50 ia64_stop(); 51 ia64_rsm(IA64_PSR_I); 52 arch_maybe_save_ip(flags); 53 return flags; 54 } 55 56 static inline void arch_local_irq_disable(void) 57 { 58 #ifdef CONFIG_IA64_DEBUG_IRQ 59 arch_local_irq_save(); 60 #else 61 ia64_stop(); 62 ia64_rsm(IA64_PSR_I); 63 #endif 64 } 65 66 static inline void arch_local_irq_enable(void) 67 { 68 ia64_stop(); 69 ia64_ssm(IA64_PSR_I); 70 ia64_srlz_d(); 71 } 72 73 static inline void arch_local_irq_restore(unsigned long flags) 74 { 75 #ifdef CONFIG_IA64_DEBUG_IRQ 76 unsigned long old_psr = arch_local_save_flags(); 77 #endif 78 ia64_intrin_local_irq_restore(flags & IA64_PSR_I); 79 arch_maybe_save_ip(old_psr & ~flags); 80 } 81 82 static inline bool arch_irqs_disabled_flags(unsigned long flags) 83 { 84 return (flags & IA64_PSR_I) == 0; 85 } 86 87 static inline bool arch_irqs_disabled(void) 88 { 89 return arch_irqs_disabled_flags(arch_local_save_flags()); 90 } 91 92 static inline void arch_safe_halt(void) 93 { 94 arch_local_irq_enable(); 95 ia64_pal_halt_light(); /* PAL_HALT_LIGHT */ 96 } 97 98 99 #endif /* _ASM_IA64_IRQFLAGS_H */ 100