include/asm-ppc64/hw_irq.h

   1 /*
   2  * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
   3  *
   4  * Use inline IRQs where possible - Anton Blanchard <anton@au.ibm.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11 #ifdef __KERNEL__
  12 #ifndef _PPC64_HW_IRQ_H
  13 #define _PPC64_HW_IRQ_H
  14
  15 #include <linux/config.h>
  16 #include <linux/errno.h>
  17 #include <asm/irq.h>
  18
  19 int timer_interrupt(struct pt_regs *);
  20 extern void ppc_irq_dispatch_handler(struct pt_regs *regs, int irq);
  21
  22 #ifdef CONFIG_PPC_ISERIES
  23
  24 extern unsigned long local_get_flags(void);
  25 extern unsigned long local_irq_disable(void);
  26 extern void local_irq_restore(unsigned long);
  27
  28 #define local_irq_enable()      local_irq_restore(1)
  29 #define local_save_flags(flags) ((flags) = local_get_flags())
  30 #define local_irq_save(flags)   ((flags) = local_irq_disable())
  31
  32 #define irqs_disabled()         (local_get_flags() == 0)
  33
  34 #else
  35
  36 #define local_save_flags(flags) ((flags) = mfmsr())
  37 #define local_irq_restore(flags) do { \
  38         __asm__ __volatile__("": : :"memory"); \
  39         __mtmsrd((flags), 1); \
  40 } while(0)
  41
  42 static inline void local_irq_disable(void)
  43 {
  44         unsigned long msr;
  45         msr = mfmsr();
  46         __mtmsrd(msr & ~MSR_EE, 1);
  47         __asm__ __volatile__("": : :"memory");
  48 }
  49
  50 static inline void local_irq_enable(void)
  51 {
  52         unsigned long msr;
  53         __asm__ __volatile__("": : :"memory");
  54         msr = mfmsr();
  55         __mtmsrd(msr | MSR_EE, 1);
  56 }
  57
  58 static inline void __do_save_and_cli(unsigned long *flags)
  59 {
  60         unsigned long msr;
  61         msr = mfmsr();
  62         *flags = msr;
  63         __mtmsrd(msr & ~MSR_EE, 1);
  64         __asm__ __volatile__("": : :"memory");
  65 }
  66
  67 #define local_irq_save(flags)          __do_save_and_cli(&flags)
  68
  69 #define irqs_disabled()                         \
  70 ({                                              \
  71         unsigned long flags;                    \
  72         local_save_flags(flags);                \
  73         !(flags & MSR_EE);                      \
  74 })
  75
  76 #endif /* CONFIG_PPC_ISERIES */
  77
  78 #define mask_irq(irq)                                           \
  79         ({                                                      \
  80                 irq_desc_t *desc = get_irq_desc(irq);           \
  81                 if (desc->handler && desc->handler->disable)    \
  82                         desc->handler->disable(irq);            \
  83         })
  84 #define unmask_irq(irq)                                         \
  85         ({                                                      \
  86                 irq_desc_t *desc = get_irq_desc(irq);           \
  87                 if (desc->handler && desc->handler->enable)     \
  88                         desc->handler->enable(irq);             \
  89         })
  90 #define ack_irq(irq)                                            \
  91         ({                                                      \
  92                 irq_desc_t *desc = get_irq_desc(irq);           \
  93                 if (desc->handler && desc->handler->ack)        \
  94                         desc->handler->ack(irq);                \
  95         })
  96
  97 /* Should we handle this via lost interrupts and IPIs or should we don't care like
  98  * we do now ? --BenH.
  99  */
 100 struct hw_interrupt_type;
 101 static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
 102
 103 #endif /* _PPC64_HW_IRQ_H */
 104 #endif /* __KERNEL__ */