include/asm-ia64/hardirq.h

   1 #ifndef _ASM_IA64_HARDIRQ_H
   2 #define _ASM_IA64_HARDIRQ_H
   3
   4 /*
   5  * Copyright (C) 1998-2002 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  */
   8
   9 #include <linux/config.h>
  10
  11 #include <linux/threads.h>
  12 #include <linux/irq.h>
  13
  14 #include <asm/processor.h>
  15
  16 /*
  17  * No irq_cpustat_t for IA-64.  The data is held in the per-CPU data structure.
  18  */
  19
  20 #define __ARCH_IRQ_STAT 1
  21
  22 #define softirq_pending(cpu)            (cpu_data(cpu)->softirq_pending)
  23 #define syscall_count(cpu)              /* unused on IA-64 */
  24 #define ksoftirqd_task(cpu)             (cpu_data(cpu)->ksoftirqd)
  25 #define nmi_count(cpu)                  0
  26
  27 #define local_softirq_pending()         (local_cpu_data->softirq_pending)
  28 #define local_syscall_count()           /* unused on IA-64 */
  29 #define local_ksoftirqd_task()          (local_cpu_data->ksoftirqd)
  30 #define local_nmi_count()               0
  31
  32 /*
  33  * We put the hardirq and softirq counter into the preemption counter. The bitmask has the
  34  * following meaning:
  35  *
  36  * - bits 0-7 are the preemption count (max preemption depth: 256)
  37  * - bits 8-15 are the softirq count (max # of softirqs: 256)
  38  * - bits 16-29 are the hardirq count (max # of hardirqs: 16384)
  39  *
  40  * - (bit 63 is the PREEMPT_ACTIVE flag---not currently implemented.)
  41  *
  42  * PREEMPT_MASK: 0x000000ff
  43  * SOFTIRQ_MASK: 0x0000ff00
  44  * HARDIRQ_MASK: 0x3fff0000
  45  */
  46
  47 #define PREEMPT_BITS    8
  48 #define SOFTIRQ_BITS    8
  49 #define HARDIRQ_BITS    14
  50
  51 #define PREEMPT_SHIFT   0
  52 #define SOFTIRQ_SHIFT   (PREEMPT_SHIFT + PREEMPT_BITS)
  53 #define HARDIRQ_SHIFT   (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
  54
  55 #define __MASK(x)       ((1UL << (x))-1)
  56
  57 #define PREEMPT_MASK    (__MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
  58 #define HARDIRQ_MASK    (__MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
  59 #define SOFTIRQ_MASK    (__MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
  60
  61 #define hardirq_count() (preempt_count() & HARDIRQ_MASK)
  62 #define softirq_count() (preempt_count() & SOFTIRQ_MASK)
  63 #define irq_count()     (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK))
  64
  65 #define PREEMPT_OFFSET  (1UL << PREEMPT_SHIFT)
  66 #define SOFTIRQ_OFFSET  (1UL << SOFTIRQ_SHIFT)
  67 #define HARDIRQ_OFFSET  (1UL << HARDIRQ_SHIFT)
  68
  69 /*
  70  * The hardirq mask has to be large enough to have space for potentially all IRQ sources
  71  * in the system nesting on a single CPU:
  72  */
  73 #if (1 << HARDIRQ_BITS) < NR_IRQS
  74 # error HARDIRQ_BITS is too low!
  75 #endif
  76
  77 /*
  78  * Are we doing bottom half or hardware interrupt processing?
  79  * Are we in a softirq context?
  80  * Interrupt context?
  81  */
  82 #define in_irq()                (hardirq_count())
  83 #define in_softirq()            (softirq_count())
  84 #define in_interrupt()          (irq_count())
  85
  86 #define hardirq_trylock()       (!in_interrupt())
  87 #define hardirq_endlock()       do { } while (0)
  88
  89 #define irq_enter()             (preempt_count() += HARDIRQ_OFFSET)
  90
  91 #ifdef CONFIG_PREEMPT
  92 # include <linux/smp_lock.h>
  93 # define in_atomic()            ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
  94 # define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
  95 #else
  96 # define in_atomic()            (preempt_count() != 0)
  97 # define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
  98 #endif
  99
 100 #define irq_exit()                                              \
 101 do {                                                            \
 102                 preempt_count() -= IRQ_EXIT_OFFSET;             \
 103                 if (!in_interrupt() && local_softirq_pending()) \
 104                         do_softirq();                           \
 105                 preempt_enable_no_resched();                    \
 106 } while (0)
 107
 108 #ifdef CONFIG_SMP
 109   extern void synchronize_irq (unsigned int irq);
 110 #else
 111 # define synchronize_irq(irq)   barrier()
 112 #endif /* CONFIG_SMP */
 113
 114 #endif /* _ASM_IA64_HARDIRQ_H */