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 extern void timer_interrupt(struct pt_regs *);
  15
  16 #ifdef CONFIG_PPC64
  17 #include <asm/paca.h>
  18
  19 static inline unsigned long arch_local_save_flags(void)
  20 {
  21         unsigned long flags;
  22
  23         asm volatile(
  24                 "lbz %0,%1(13)"
  25                 : "=r" (flags)
  26                 : "i" (offsetof(struct paca_struct, soft_enabled)));
  27
  28         return flags;
  29 }
  30
  31 static inline unsigned long arch_local_irq_disable(void)
  32 {
  33         unsigned long flags, zero;
  34
  35         asm volatile(
  36                 "li %1,0; lbz %0,%2(13); stb %1,%2(13)"
  37                 : "=r" (flags), "=&r" (zero)
  38                 : "i" (offsetof(struct paca_struct, soft_enabled))
  39                 : "memory");
  40
  41         return flags;
  42 }
  43
  44 extern void arch_local_irq_restore(unsigned long);
  45 extern void iseries_handle_interrupts(void);
  46
  47 static inline void arch_local_irq_enable(void)
  48 {
  49         arch_local_irq_restore(1);
  50 }
  51
  52 static inline unsigned long arch_local_irq_save(void)
  53 {
  54         return arch_local_irq_disable();
  55 }
  56
  57 static inline bool arch_irqs_disabled_flags(unsigned long flags)
  58 {
  59         return flags == 0;
  60 }
  61
  62 static inline bool arch_irqs_disabled(void)
  63 {
  64         return arch_irqs_disabled_flags(arch_local_save_flags());
  65 }
  66
  67 #ifdef CONFIG_PPC_BOOK3E
  68 #define __hard_irq_enable()     asm volatile("wrteei 1" : : : "memory");
  69 #define __hard_irq_disable()    asm volatile("wrteei 0" : : : "memory");
  70 #else
  71 #define __hard_irq_enable()     __mtmsrd(mfmsr() | MSR_EE, 1)
  72 #define __hard_irq_disable()    __mtmsrd(mfmsr() & ~MSR_EE, 1)
  73 #endif
  74
  75 #define  hard_irq_disable()                     \
  76         do {                                    \
  77                 __hard_irq_disable();           \
  78                 get_paca()->soft_enabled = 0;   \
  79                 get_paca()->hard_enabled = 0;   \
  80         } while(0)
  81
  82 #else /* CONFIG_PPC64 */
  83
  84 #define SET_MSR_EE(x)   mtmsr(x)
  85
  86 static inline unsigned long arch_local_save_flags(void)
  87 {
  88         return mfmsr();
  89 }
  90
  91 static inline void arch_local_irq_restore(unsigned long flags)
  92 {
  93 #if defined(CONFIG_BOOKE)
  94         asm volatile("wrtee %0" : : "r" (flags) : "memory");
  95 #else
  96         mtmsr(flags);
  97 #endif
  98 }
  99
 100 static inline unsigned long arch_local_irq_save(void)
 101 {
 102         unsigned long flags = arch_local_save_flags();
 103 #ifdef CONFIG_BOOKE
 104         asm volatile("wrteei 0" : : : "memory");
 105 #else
 106         SET_MSR_EE(flags & ~MSR_EE);
 107 #endif
 108         return flags;
 109 }
 110
 111 static inline void arch_local_irq_disable(void)
 112 {
 113 #ifdef CONFIG_BOOKE
 114         asm volatile("wrteei 0" : : : "memory");
 115 #else
 116         arch_local_irq_save();
 117 #endif
 118 }
 119
 120 static inline void arch_local_irq_enable(void)
 121 {
 122 #ifdef CONFIG_BOOKE
 123         asm volatile("wrteei 1" : : : "memory");
 124 #else
 125         unsigned long msr = mfmsr();
 126         SET_MSR_EE(msr | MSR_EE);
 127 #endif
 128 }
 129
 130 static inline bool arch_irqs_disabled_flags(unsigned long flags)
 131 {
 132         return (flags & MSR_EE) == 0;
 133 }
 134
 135 static inline bool arch_irqs_disabled(void)
 136 {
 137         return arch_irqs_disabled_flags(arch_local_save_flags());
 138 }
 139
 140 #define hard_irq_disable()              arch_local_irq_disable()
 141
 142 #endif /* CONFIG_PPC64 */
 143
 144 #define ARCH_IRQ_INIT_FLAGS     IRQ_NOREQUEST
 145
 146 /*
 147  * interrupt-retrigger: should we handle this via lost interrupts and IPIs
 148  * or should we not care like we do now ? --BenH.
 149  */
 150 struct irq_chip;
 151
 152 #endif  /* __KERNEL__ */
 153 #endif  /* _ASM_POWERPC_HW_IRQ_H */