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 extern void WatchdogException(struct pt_regs *regs);
  38 extern void unknown_exception(struct pt_regs *regs);
  39
  40 #ifdef CONFIG_PPC64
  41 #include <asm/paca.h>
  42
  43 static inline unsigned long arch_local_save_flags(void)
  44 {
  45         unsigned long flags;
  46
  47         asm volatile(
  48                 "lbz %0,%1(13)"
  49                 : "=r" (flags)
  50                 : "i" (offsetof(struct paca_struct, soft_enabled)));
  51
  52         return flags;
  53 }
  54
  55 static inline unsigned long arch_local_irq_disable(void)
  56 {
  57         unsigned long flags, zero;
  58
  59         asm volatile(
  60                 "li %1,0; lbz %0,%2(13); stb %1,%2(13)"
  61                 : "=r" (flags), "=&r" (zero)
  62                 : "i" (offsetof(struct paca_struct, soft_enabled))
  63                 : "memory");
  64
  65         return flags;
  66 }
  67
  68 extern void arch_local_irq_restore(unsigned long);
  69
  70 static inline void arch_local_irq_enable(void)
  71 {
  72         arch_local_irq_restore(1);
  73 }
  74
  75 static inline unsigned long arch_local_irq_save(void)
  76 {
  77         return arch_local_irq_disable();
  78 }
  79
  80 static inline bool arch_irqs_disabled_flags(unsigned long flags)
  81 {
  82         return flags == 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 #ifdef CONFIG_PPC_BOOK3E
  91 #define __hard_irq_enable()     asm volatile("wrteei 1" : : : "memory")
  92 #define __hard_irq_disable()    asm volatile("wrteei 0" : : : "memory")
  93 #else
  94 #define __hard_irq_enable()     __mtmsrd(local_paca->kernel_msr | MSR_EE, 1)
  95 #define __hard_irq_disable()    __mtmsrd(local_paca->kernel_msr, 1)
  96 #endif
  97
  98 #define hard_irq_disable()      do {                    \
  99         u8 _was_enabled;                                \
 100         __hard_irq_disable();                           \
 101         _was_enabled = local_paca->soft_enabled;        \
 102         local_paca->soft_enabled = 0;                   \
 103         local_paca->irq_happened |= PACA_IRQ_HARD_DIS;  \
 104         if (_was_enabled)                               \
 105                 trace_hardirqs_off();                   \
 106 } while(0)
 107
 108 static inline bool lazy_irq_pending(void)
 109 {
 110         return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS);
 111 }
 112
 113 /*
 114  * This is called by asynchronous interrupts to conditionally
 115  * re-enable hard interrupts when soft-disabled after having
 116  * cleared the source of the interrupt
 117  */
 118 static inline void may_hard_irq_enable(void)
 119 {
 120         get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS;
 121         if (!(get_paca()->irq_happened & PACA_IRQ_EE))
 122                 __hard_irq_enable();
 123 }
 124
 125 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
 126 {
 127         return !regs->softe;
 128 }
 129
 130 extern bool prep_irq_for_idle(void);
 131
 132 #else /* CONFIG_PPC64 */
 133
 134 #define SET_MSR_EE(x)   mtmsr(x)
 135
 136 static inline unsigned long arch_local_save_flags(void)
 137 {
 138         return mfmsr();
 139 }
 140
 141 static inline void arch_local_irq_restore(unsigned long flags)
 142 {
 143 #if defined(CONFIG_BOOKE)
 144         asm volatile("wrtee %0" : : "r" (flags) : "memory");
 145 #else
 146         mtmsr(flags);
 147 #endif
 148 }
 149
 150 static inline unsigned long arch_local_irq_save(void)
 151 {
 152         unsigned long flags = arch_local_save_flags();
 153 #ifdef CONFIG_BOOKE
 154         asm volatile("wrteei 0" : : : "memory");
 155 #else
 156         SET_MSR_EE(flags & ~MSR_EE);
 157 #endif
 158         return flags;
 159 }
 160
 161 static inline void arch_local_irq_disable(void)
 162 {
 163 #ifdef CONFIG_BOOKE
 164         asm volatile("wrteei 0" : : : "memory");
 165 #else
 166         arch_local_irq_save();
 167 #endif
 168 }
 169
 170 static inline void arch_local_irq_enable(void)
 171 {
 172 #ifdef CONFIG_BOOKE
 173         asm volatile("wrteei 1" : : : "memory");
 174 #else
 175         unsigned long msr = mfmsr();
 176         SET_MSR_EE(msr | MSR_EE);
 177 #endif
 178 }
 179
 180 static inline bool arch_irqs_disabled_flags(unsigned long flags)
 181 {
 182         return (flags & MSR_EE) == 0;
 183 }
 184
 185 static inline bool arch_irqs_disabled(void)
 186 {
 187         return arch_irqs_disabled_flags(arch_local_save_flags());
 188 }
 189
 190 #define hard_irq_disable()              arch_local_irq_disable()
 191
 192 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
 193 {
 194         return !(regs->msr & MSR_EE);
 195 }
 196
 197 static inline void may_hard_irq_enable(void) { }
 198
 199 #endif /* CONFIG_PPC64 */
 200
 201 #define ARCH_IRQ_INIT_FLAGS     IRQ_NOREQUEST
 202
 203 /*
 204  * interrupt-retrigger: should we handle this via lost interrupts and IPIs
 205  * or should we not care like we do now ? --BenH.
 206  */
 207 struct irq_chip;
 208
 209 #endif  /* __ASSEMBLY__ */
 210 #endif  /* __KERNEL__ */
 211 #endif  /* _ASM_POWERPC_HW_IRQ_H */