arch/um/kernel/irq.c

   1 /*
   2  * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  * Derived (i.e. mostly copied) from arch/i386/kernel/irq.c:
   5  *      Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
   6  */
   7
   8 #include "linux/config.h"
   9 #include "linux/kernel.h"
  10 #include "linux/module.h"
  11 #include "linux/smp.h"
  12 #include "linux/irq.h"
  13 #include "linux/kernel_stat.h"
  14 #include "linux/interrupt.h"
  15 #include "linux/random.h"
  16 #include "linux/slab.h"
  17 #include "linux/file.h"
  18 #include "linux/proc_fs.h"
  19 #include "linux/init.h"
  20 #include "linux/seq_file.h"
  21 #include "linux/profile.h"
  22 #include "linux/hardirq.h"
  23 #include "asm/irq.h"
  24 #include "asm/hw_irq.h"
  25 #include "asm/atomic.h"
  26 #include "asm/signal.h"
  27 #include "asm/system.h"
  28 #include "asm/errno.h"
  29 #include "asm/uaccess.h"
  30 #include "user_util.h"
  31 #include "kern_util.h"
  32 #include "irq_user.h"
  33 #include "irq_kern.h"
  34
  35
  36 /*
  37  * Generic, controller-independent functions:
  38  */
  39
  40 int show_interrupts(struct seq_file *p, void *v)
  41 {
  42         int i = *(loff_t *) v, j;
  43         struct irqaction * action;
  44         unsigned long flags;
  45
  46         if (i == 0) {
  47                 seq_printf(p, "           ");
  48                 for_each_online_cpu(j)
  49                         seq_printf(p, "CPU%d       ",j);
  50                 seq_putc(p, '\n');
  51         }
  52
  53         if (i < NR_IRQS) {
  54                 spin_lock_irqsave(&irq_desc[i].lock, flags);
  55                 action = irq_desc[i].action;
  56                 if (!action)
  57                         goto skip;
  58                 seq_printf(p, "%3d: ",i);
  59 #ifndef CONFIG_SMP
  60                 seq_printf(p, "%10u ", kstat_irqs(i));
  61 #else
  62                 for_each_online_cpu(j)
  63                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
  64 #endif
  65                 seq_printf(p, " %14s", irq_desc[i].handler->typename);
  66                 seq_printf(p, "  %s", action->name);
  67
  68                 for (action=action->next; action; action = action->next)
  69                         seq_printf(p, ", %s", action->name);
  70
  71                 seq_putc(p, '\n');
  72 skip:
  73                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  74         } else if (i == NR_IRQS) {
  75                 seq_putc(p, '\n');
  76         }
  77
  78         return 0;
  79 }
  80
  81 /*
  82  * do_IRQ handles all normal device IRQ's (the special
  83  * SMP cross-CPU interrupts have their own specific
  84  * handlers).
  85  */
  86 unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
  87 {
  88        irq_enter();
  89        __do_IRQ(irq, (struct pt_regs *) regs);
  90        irq_exit();
  91        return 1;
  92 }
  93
  94 int um_request_irq(unsigned int irq, int fd, int type,
  95                    irqreturn_t (*handler)(int, void *, struct pt_regs *),
  96                    unsigned long irqflags, const char * devname,
  97                    void *dev_id)
  98 {
  99         int err;
 100
 101         err = request_irq(irq, handler, irqflags, devname, dev_id);
 102         if(err)
 103                 return(err);
 104
 105         if(fd != -1)
 106                 err = activate_fd(irq, fd, type, dev_id);
 107         return(err);
 108 }
 109 EXPORT_SYMBOL(um_request_irq);
 110 EXPORT_SYMBOL(reactivate_fd);
 111
 112 static DEFINE_SPINLOCK(irq_spinlock);
 113
 114 unsigned long irq_lock(void)
 115 {
 116         unsigned long flags;
 117
 118         spin_lock_irqsave(&irq_spinlock, flags);
 119         return(flags);
 120 }
 121
 122 void irq_unlock(unsigned long flags)
 123 {
 124         spin_unlock_irqrestore(&irq_spinlock, flags);
 125 }
 126
 127 /*  presently hw_interrupt_type must define (startup || enable) &&
 128  *  disable && end */
 129 static void dummy(unsigned int irq)
 130 {
 131 }
 132
 133 static struct hw_interrupt_type SIGIO_irq_type = {
 134         .typename = "SIGIO",
 135         .disable = dummy,
 136         .enable = dummy,
 137         .ack = dummy,
 138         .end = dummy
 139 };
 140
 141 static struct hw_interrupt_type SIGVTALRM_irq_type = {
 142         .typename = "SIGVTALRM",
 143         .shutdown = dummy, /* never called */
 144         .disable = dummy,
 145         .enable = dummy,
 146         .ack = dummy,
 147         .end = dummy
 148 };
 149
 150 void __init init_IRQ(void)
 151 {
 152         int i;
 153
 154         irq_desc[TIMER_IRQ].status = IRQ_DISABLED;
 155         irq_desc[TIMER_IRQ].action = NULL;
 156         irq_desc[TIMER_IRQ].depth = 1;
 157         irq_desc[TIMER_IRQ].handler = &SIGVTALRM_irq_type;
 158         enable_irq(TIMER_IRQ);
 159         for(i=1;i<NR_IRQS;i++){
 160                 irq_desc[i].status = IRQ_DISABLED;
 161                 irq_desc[i].action = NULL;
 162                 irq_desc[i].depth = 1;
 163                 irq_desc[i].handler = &SIGIO_irq_type;
 164                 enable_irq(i);
 165         }
 166         init_irq_signals(0);
 167 }
 168
 169 /*
 170  * Overrides for Emacs so that we follow Linus's tabbing style.
 171  * Emacs will notice this stuff at the end of the file and automatically
 172  * adjust the settings for this buffer only.  This must remain at the end
 173  * of the file.
 174  * ---------------------------------------------------------------------------
 175  * Local variables:
 176  * c-file-style: "linux"
 177  * End:
 178  */