release/src-rt-6.x.4708/linux/linux-2.6.36/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 local_get_flags(void)
  20 {
  21         unsigned long flags;
  22
  23         __asm__ __volatile__("lbz %0,%1(13)"
  24         : "=r" (flags)
  25         : "i" (offsetof(struct paca_struct, soft_enabled)));
  26
  27         return flags;
  28 }
  29
  30 static inline unsigned long raw_local_irq_disable(void)
  31 {
  32         unsigned long flags, zero;
  33
  34         __asm__ __volatile__("li %1,0; lbz %0,%2(13); stb %1,%2(13)"
  35         : "=r" (flags), "=&r" (zero)
  36         : "i" (offsetof(struct paca_struct, soft_enabled))
  37         : "memory");
  38
  39         return flags;
  40 }
  41
  42 extern void raw_local_irq_restore(unsigned long);
  43 extern void iseries_handle_interrupts(void);
  44
  45 #define raw_local_irq_enable()          raw_local_irq_restore(1)
  46 #define raw_local_save_flags(flags)     ((flags) = local_get_flags())
  47 #define raw_local_irq_save(flags)       ((flags) = raw_local_irq_disable())
  48
  49 #define raw_irqs_disabled()             (local_get_flags() == 0)
  50 #define raw_irqs_disabled_flags(flags)  ((flags) == 0)
  51
  52 #ifdef CONFIG_PPC_BOOK3E
  53 #define __hard_irq_enable()     __asm__ __volatile__("wrteei 1": : :"memory");
  54 #define __hard_irq_disable()    __asm__ __volatile__("wrteei 0": : :"memory");
  55 #else
  56 #define __hard_irq_enable()     __mtmsrd(mfmsr() | MSR_EE, 1)
  57 #define __hard_irq_disable()    __mtmsrd(mfmsr() & ~MSR_EE, 1)
  58 #endif
  59
  60 #define  hard_irq_disable()                     \
  61         do {                                    \
  62                 __hard_irq_disable();           \
  63                 get_paca()->soft_enabled = 0;   \
  64                 get_paca()->hard_enabled = 0;   \
  65         } while(0)
  66
  67 #else
  68
  69 #if defined(CONFIG_BOOKE)
  70 #define SET_MSR_EE(x)   mtmsr(x)
  71 #define raw_local_irq_restore(flags)    __asm__ __volatile__("wrtee %0" : : "r" (flags) : "memory")
  72 #else
  73 #define SET_MSR_EE(x)   mtmsr(x)
  74 #define raw_local_irq_restore(flags)    mtmsr(flags)
  75 #endif
  76
  77 static inline void raw_local_irq_disable(void)
  78 {
  79 #ifdef CONFIG_BOOKE
  80         __asm__ __volatile__("wrteei 0": : :"memory");
  81 #else
  82         unsigned long msr;
  83
  84         msr = mfmsr();
  85         SET_MSR_EE(msr & ~MSR_EE);
  86 #endif
  87 }
  88
  89 static inline void raw_local_irq_enable(void)
  90 {
  91 #ifdef CONFIG_BOOKE
  92         __asm__ __volatile__("wrteei 1": : :"memory");
  93 #else
  94         unsigned long msr;
  95
  96         msr = mfmsr();
  97         SET_MSR_EE(msr | MSR_EE);
  98 #endif
  99 }
 100
 101 static inline void raw_local_irq_save_ptr(unsigned long *flags)
 102 {
 103         unsigned long msr;
 104         msr = mfmsr();
 105         *flags = msr;
 106 #ifdef CONFIG_BOOKE
 107         __asm__ __volatile__("wrteei 0": : :"memory");
 108 #else
 109         SET_MSR_EE(msr & ~MSR_EE);
 110 #endif
 111 }
 112
 113 #define raw_local_save_flags(flags)     ((flags) = mfmsr())
 114 #define raw_local_irq_save(flags)       raw_local_irq_save_ptr(&flags)
 115 #define raw_irqs_disabled()             ((mfmsr() & MSR_EE) == 0)
 116 #define raw_irqs_disabled_flags(flags)  (((flags) & MSR_EE) == 0)
 117
 118 #define hard_irq_disable()              raw_local_irq_disable()
 119
 120 static inline int irqs_disabled_flags(unsigned long flags)
 121 {
 122         return (flags & MSR_EE) == 0;
 123 }
 124
 125 #endif /* CONFIG_PPC64 */
 126
 127 /*
 128  * interrupt-retrigger: should we handle this via lost interrupts and IPIs
 129  * or should we not care like we do now ? --BenH.
 130  */
 131 struct irq_chip;
 132
 133 #endif  /* __KERNEL__ */
 134 #endif  /* _ASM_POWERPC_HW_IRQ_H */