arch/powerpc/include/asm/hw_irq.h

   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
  29 #endif /* CONFIG_PPC64 */
  30
  31 #ifndef __ASSEMBLY__
  32
  33 extern void __replay_interrupt(unsigned int vector);
  34
  35 extern void timer_interrupt(struct pt_regs *);
  36 extern void performance_monitor_exception(struct pt_regs *regs);
  37
  38 #ifdef CONFIG_PPC64
  39 #include <asm/paca.h>
  40
  41 static inline unsigned long arch_local_save_flags(void)
  42 {
  43         unsigned long flags;
  44
  45         asm volatile(
  46                 "lbz %0,%1(13)"
  47                 : "=r" (flags)
  48                 : "i" (offsetof(struct paca_struct, soft_enabled)));
  49
  50         return flags;
  51 }
  52
  53 static inline unsigned long arch_local_irq_disable(void)
  54 {
  55         unsigned long flags, zero;
  56
  57         asm volatile(
  58                 "li %1,0; lbz %0,%2(13); stb %1,%2(13)"
  59                 : "=r" (flags), "=&r" (zero)
  60                 : "i" (offsetof(struct paca_struct, soft_enabled))
  61                 : "memory");
  62
  63         return flags;
  64 }
  65
  66 extern void arch_local_irq_restore(unsigned long);
  67
  68 static inline void arch_local_irq_enable(void)
  69 {
  70         arch_local_irq_restore(1);
  71 }
  72
  73 static inline unsigned long arch_local_irq_save(void)
  74 {
  75         return arch_local_irq_disable();
  76 }
  77
  78 static inline bool arch_irqs_disabled_flags(unsigned long flags)
  79 {
  80         return flags == 0;
  81 }
  82
  83 static inline bool arch_irqs_disabled(void)
  84 {
  85         return arch_irqs_disabled_flags(arch_local_save_flags());
  86 }
  87
  88 #ifdef CONFIG_PPC_BOOK3E
  89 #define __hard_irq_enable()     asm volatile("wrteei 1" : : : "memory");
  90 #define __hard_irq_disable()    asm volatile("wrteei 0" : : : "memory");
  91 #else
  92 #define __hard_irq_enable()     __mtmsrd(local_paca->kernel_msr | MSR_EE, 1)
  93 #define __hard_irq_disable()    __mtmsrd(local_paca->kernel_msr, 1)
  94 #endif
  95
  96 static inline void hard_irq_disable(void)
  97 {
  98         __hard_irq_disable();
  99         get_paca()->soft_enabled = 0;
 100         get_paca()->irq_happened |= PACA_IRQ_HARD_DIS;
 101 }
 102
 103 /* include/linux/interrupt.h needs hard_irq_disable to be a macro */
 104 #define hard_irq_disable        hard_irq_disable
 105
 106 static inline bool lazy_irq_pending(void)
 107 {
 108         return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS);
 109 }
 110
 111 /*
 112  * This is called by asynchronous interrupts to conditionally
 113  * re-enable hard interrupts when soft-disabled after having
 114  * cleared the source of the interrupt
 115  */
 116 static inline void may_hard_irq_enable(void)
 117 {
 118         get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS;
 119         if (!(get_paca()->irq_happened & PACA_IRQ_EE))
 120                 __hard_irq_enable();
 121 }
 122
 123 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
 124 {
 125         return !regs->softe;
 126 }
 127
 128 #else /* CONFIG_PPC64 */
 129
 130 #define SET_MSR_EE(x)   mtmsr(x)
 131
 132 static inline unsigned long arch_local_save_flags(void)
 133 {
 134         return mfmsr();
 135 }
 136
 137 static inline void arch_local_irq_restore(unsigned long flags)
 138 {
 139 #if defined(CONFIG_BOOKE)
 140         asm volatile("wrtee %0" : : "r" (flags) : "memory");
 141 #else
 142         mtmsr(flags);
 143 #endif
 144 }
 145
 146 static inline unsigned long arch_local_irq_save(void)
 147 {
 148         unsigned long flags = arch_local_save_flags();
 149 #ifdef CONFIG_BOOKE
 150         asm volatile("wrteei 0" : : : "memory");
 151 #else
 152         SET_MSR_EE(flags & ~MSR_EE);
 153 #endif
 154         return flags;
 155 }
 156
 157 static inline void arch_local_irq_disable(void)
 158 {
 159 #ifdef CONFIG_BOOKE
 160         asm volatile("wrteei 0" : : : "memory");
 161 #else
 162         arch_local_irq_save();
 163 #endif
 164 }
 165
 166 static inline void arch_local_irq_enable(void)
 167 {
 168 #ifdef CONFIG_BOOKE
 169         asm volatile("wrteei 1" : : : "memory");
 170 #else
 171         unsigned long msr = mfmsr();
 172         SET_MSR_EE(msr | MSR_EE);
 173 #endif
 174 }
 175
 176 static inline bool arch_irqs_disabled_flags(unsigned long flags)
 177 {
 178         return (flags & MSR_EE) == 0;
 179 }
 180
 181 static inline bool arch_irqs_disabled(void)
 182 {
 183         return arch_irqs_disabled_flags(arch_local_save_flags());
 184 }
 185
 186 #define hard_irq_disable()              arch_local_irq_disable()
 187
 188 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
 189 {
 190         return !(regs->msr & MSR_EE);
 191 }
 192
 193 static inline void may_hard_irq_enable(void) { }
 194
 195 #endif /* CONFIG_PPC64 */
 196
 197 #define ARCH_IRQ_INIT_FLAGS     IRQ_NOREQUEST
 198
 199 /*
 200  * interrupt-retrigger: should we handle this via lost interrupts and IPIs
 201  * or should we not care like we do now ? --BenH.
 202  */
 203 struct irq_chip;
 204
 205 #endif  /* __ASSEMBLY__ */
 206 #endif  /* __KERNEL__ */
 207 #endif  /* _ASM_POWERPC_HW_IRQ_H */