1 /* 2 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu> 3 */ 4 #ifndef _ASM_POWERPC_HW_IRQ_H 5 #define _ASM_POWERPC_HW_IRQ_H 6 7 #ifdef __KERNEL__ 8 9 #include <linux/errno.h> 10 #include <linux/compiler.h> 11 #include <asm/ptrace.h> 12 #include <asm/processor.h> 13 14 #ifdef CONFIG_PPC64 15 16 /* 17 * PACA flags in paca->irq_happened. 18 * 19 * This bits are set when interrupts occur while soft-disabled 20 * and allow a proper replay. Additionally, PACA_IRQ_HARD_DIS 21 * is set whenever we manually hard disable. 22 */ 23 #define PACA_IRQ_HARD_DIS 0x01 24 #define PACA_IRQ_DBELL 0x02 25 #define PACA_IRQ_EE 0x04 26 #define PACA_IRQ_DEC 0x08 /* Or FIT */ 27 #define PACA_IRQ_EE_EDGE 0x10 /* BookE only */ 28 #define PACA_IRQ_HMI 0x20 29 30 #endif /* CONFIG_PPC64 */ 31 32 #ifndef __ASSEMBLY__ 33 34 extern void __replay_interrupt(unsigned int vector); 35 36 extern void timer_interrupt(struct pt_regs *); 37 extern void performance_monitor_exception(struct pt_regs *regs); 38 extern void WatchdogException(struct pt_regs *regs); 39 extern void unknown_exception(struct pt_regs *regs); 40 41 #ifdef CONFIG_PPC64 42 #include <asm/paca.h> 43 44 static inline unsigned long arch_local_save_flags(void) 45 { 46 unsigned long flags; 47 48 asm volatile( 49 "lbz %0,%1(13)" 50 : "=r" (flags) 51 : "i" (offsetof(struct paca_struct, soft_enabled))); 52 53 return flags; 54 } 55 56 static inline unsigned long arch_local_irq_disable(void) 57 { 58 unsigned long flags, zero; 59 60 asm volatile( 61 "li %1,0; lbz %0,%2(13); stb %1,%2(13)" 62 : "=r" (flags), "=&r" (zero) 63 : "i" (offsetof(struct paca_struct, soft_enabled)) 64 : "memory"); 65 66 return flags; 67 } 68 69 extern void arch_local_irq_restore(unsigned long); 70 71 static inline void arch_local_irq_enable(void) 72 { 73 arch_local_irq_restore(1); 74 } 75 76 static inline unsigned long arch_local_irq_save(void) 77 { 78 return arch_local_irq_disable(); 79 } 80 81 static inline bool arch_irqs_disabled_flags(unsigned long flags) 82 { 83 return flags == 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 #ifdef CONFIG_PPC_BOOK3E 92 #define __hard_irq_enable() asm volatile("wrteei 1" : : : "memory") 93 #define __hard_irq_disable() asm volatile("wrteei 0" : : : "memory") 94 #else 95 #define __hard_irq_enable() __mtmsrd(local_paca->kernel_msr | MSR_EE, 1) 96 #define __hard_irq_disable() __mtmsrd(local_paca->kernel_msr, 1) 97 #endif 98 99 #define hard_irq_disable() do { \ 100 u8 _was_enabled; \ 101 __hard_irq_disable(); \ 102 _was_enabled = local_paca->soft_enabled; \ 103 local_paca->soft_enabled = 0; \ 104 local_paca->irq_happened |= PACA_IRQ_HARD_DIS; \ 105 if (_was_enabled) \ 106 trace_hardirqs_off(); \ 107 } while(0) 108 109 static inline bool lazy_irq_pending(void) 110 { 111 return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS); 112 } 113 114 /* 115 * This is called by asynchronous interrupts to conditionally 116 * re-enable hard interrupts when soft-disabled after having 117 * cleared the source of the interrupt 118 */ 119 static inline void may_hard_irq_enable(void) 120 { 121 get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS; 122 if (!(get_paca()->irq_happened & PACA_IRQ_EE)) 123 __hard_irq_enable(); 124 } 125 126 static inline bool arch_irq_disabled_regs(struct pt_regs *regs) 127 { 128 return !regs->softe; 129 } 130 131 extern bool prep_irq_for_idle(void); 132 133 #else /* CONFIG_PPC64 */ 134 135 #define SET_MSR_EE(x) mtmsr(x) 136 137 static inline unsigned long arch_local_save_flags(void) 138 { 139 return mfmsr(); 140 } 141 142 static inline void arch_local_irq_restore(unsigned long flags) 143 { 144 #if defined(CONFIG_BOOKE) 145 asm volatile("wrtee %0" : : "r" (flags) : "memory"); 146 #else 147 mtmsr(flags); 148 #endif 149 } 150 151 static inline unsigned long arch_local_irq_save(void) 152 { 153 unsigned long flags = arch_local_save_flags(); 154 #ifdef CONFIG_BOOKE 155 asm volatile("wrteei 0" : : : "memory"); 156 #else 157 SET_MSR_EE(flags & ~MSR_EE); 158 #endif 159 return flags; 160 } 161 162 static inline void arch_local_irq_disable(void) 163 { 164 #ifdef CONFIG_BOOKE 165 asm volatile("wrteei 0" : : : "memory"); 166 #else 167 arch_local_irq_save(); 168 #endif 169 } 170 171 static inline void arch_local_irq_enable(void) 172 { 173 #ifdef CONFIG_BOOKE 174 asm volatile("wrteei 1" : : : "memory"); 175 #else 176 unsigned long msr = mfmsr(); 177 SET_MSR_EE(msr | MSR_EE); 178 #endif 179 } 180 181 static inline bool arch_irqs_disabled_flags(unsigned long flags) 182 { 183 return (flags & MSR_EE) == 0; 184 } 185 186 static inline bool arch_irqs_disabled(void) 187 { 188 return arch_irqs_disabled_flags(arch_local_save_flags()); 189 } 190 191 #define hard_irq_disable() arch_local_irq_disable() 192 193 static inline bool arch_irq_disabled_regs(struct pt_regs *regs) 194 { 195 return !(regs->msr & MSR_EE); 196 } 197 198 static inline void may_hard_irq_enable(void) { } 199 200 #endif /* CONFIG_PPC64 */ 201 202 #define ARCH_IRQ_INIT_FLAGS IRQ_NOREQUEST 203 204 /* 205 * interrupt-retrigger: should we handle this via lost interrupts and IPIs 206 * or should we not care like we do now ? --BenH. 207 */ 208 struct irq_chip; 209 210 #endif /* __ASSEMBLY__ */ 211 #endif /* __KERNEL__ */ 212 #endif /* _ASM_POWERPC_HW_IRQ_H */ 213