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 15 #ifdef CONFIG_IA64_DEBUG_IRQ 16 extern unsigned long last_cli_ip; 17 static inline void arch_maybe_save_ip(unsigned long flags) 18 { 19 if (flags & IA64_PSR_I) 20 last_cli_ip = ia64_getreg(_IA64_REG_IP); 21 } 22 #else 23 #define arch_maybe_save_ip(flags) do {} while (0) 24 #endif 25 26 /* 27 * - clearing psr.i is implicitly serialized (visible by next insn) 28 * - setting psr.i requires data serialization 29 * - we need a stop-bit before reading PSR because we sometimes 30 * write a floating-point register right before reading the PSR 31 * and that writes to PSR.mfl 32 */ 33 34 static inline unsigned long arch_local_save_flags(void) 35 { 36 ia64_stop(); 37 #ifdef CONFIG_PARAVIRT 38 return ia64_get_psr_i(); 39 #else 40 return ia64_getreg(_IA64_REG_PSR); 41 #endif 42 } 43 44 static inline unsigned long arch_local_irq_save(void) 45 { 46 unsigned long flags = arch_local_save_flags(); 47 48 ia64_stop(); 49 ia64_rsm(IA64_PSR_I); 50 arch_maybe_save_ip(flags); 51 return flags; 52 } 53 54 static inline void arch_local_irq_disable(void) 55 { 56 #ifdef CONFIG_IA64_DEBUG_IRQ 57 arch_local_irq_save(); 58 #else 59 ia64_stop(); 60 ia64_rsm(IA64_PSR_I); 61 #endif 62 } 63 64 static inline void arch_local_irq_enable(void) 65 { 66 ia64_stop(); 67 ia64_ssm(IA64_PSR_I); 68 ia64_srlz_d(); 69 } 70 71 static inline void arch_local_irq_restore(unsigned long flags) 72 { 73 #ifdef CONFIG_IA64_DEBUG_IRQ 74 unsigned long old_psr = arch_local_save_flags(); 75 #endif 76 ia64_intrin_local_irq_restore(flags & IA64_PSR_I); 77 arch_maybe_save_ip(old_psr & ~flags); 78 } 79 80 static inline bool arch_irqs_disabled_flags(unsigned long flags) 81 { 82 return (flags & IA64_PSR_I) == 0; 83 } 84 85 static inline bool arch_irqs_disabled(void) 86 { 87 return arch_irqs_disabled_flags(arch_local_save_flags()); 88 } 89 90 static inline void arch_safe_halt(void) 91 { 92 ia64_pal_halt_light(); /* PAL_HALT_LIGHT */ 93 } 94 95 96 #endif /* _ASM_IA64_IRQFLAGS_H */ 97