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