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 (j=0; j<NR_CPUS; j++)
  49                         if (cpu_online(j))
  50                                 seq_printf(p, "CPU%d       ",j);
  51                 seq_putc(p, '\n');
  52         }
  53
  54         if (i < NR_IRQS) {
  55                 spin_lock_irqsave(&irq_desc[i].lock, flags);
  56                 action = irq_desc[i].action;
  57                 if (!action)
  58                         goto skip;
  59                 seq_printf(p, "%3d: ",i);
  60 #ifndef CONFIG_SMP
  61                 seq_printf(p, "%10u ", kstat_irqs(i));
  62 #else
  63                 for (j = 0; j < NR_CPUS; j++)
  64                         if (cpu_online(j))
  65                                 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
  66 #endif
  67                 seq_printf(p, " %14s", irq_desc[i].handler->typename);
  68                 seq_printf(p, "  %s", action->name);
  69
  70                 for (action=action->next; action; action = action->next)
  71                         seq_printf(p, ", %s", action->name);
  72
  73                 seq_putc(p, '\n');
  74 skip:
  75                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  76         } else if (i == NR_IRQS) {
  77                 seq_putc(p, '\n');
  78         }
  79
  80         return 0;
  81 }
  82
  83 /*
  84  * do_IRQ handles all normal device IRQ's (the special
  85  * SMP cross-CPU interrupts have their own specific
  86  * handlers).
  87  */
  88 unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
  89 {
  90        irq_enter();
  91        __do_IRQ(irq, (struct pt_regs *) regs);
  92        irq_exit();
  93        return 1;
  94 }
  95
  96 int um_request_irq(unsigned int irq, int fd, int type,
  97                    irqreturn_t (*handler)(int, void *, struct pt_regs *),
  98                    unsigned long irqflags, const char * devname,
  99                    void *dev_id)
 100 {
 101         int err;
 102
 103         err = request_irq(irq, handler, irqflags, devname, dev_id);
 104         if(err)
 105                 return(err);
 106
 107         if(fd != -1)
 108                 err = activate_fd(irq, fd, type, dev_id);
 109         return(err);
 110 }
 111 EXPORT_SYMBOL(um_request_irq);
 112 EXPORT_SYMBOL(reactivate_fd);
 113
 114 static spinlock_t irq_spinlock = SPIN_LOCK_UNLOCKED;
 115
 116 unsigned long irq_lock(void)
 117 {
 118         unsigned long flags;
 119
 120         spin_lock_irqsave(&irq_spinlock, flags);
 121         return(flags);
 122 }
 123
 124 void irq_unlock(unsigned long flags)
 125 {
 126         spin_unlock_irqrestore(&irq_spinlock, flags);
 127 }
 128
 129 /*  presently hw_interrupt_type must define (startup || enable) &&
 130  *  disable && end */
 131 static void dummy(unsigned int irq)
 132 {
 133 }
 134
 135 static struct hw_interrupt_type SIGIO_irq_type = {
 136         .typename = "SIGIO",
 137         .disable = dummy,
 138         .enable = dummy,
 139         .ack = dummy,
 140         .end = dummy
 141 };
 142
 143 static struct hw_interrupt_type SIGVTALRM_irq_type = {
 144         .typename = "SIGVTALRM",
 145         .shutdown = dummy, /* never called */
 146         .disable = dummy,
 147         .enable = dummy,
 148         .ack = dummy,
 149         .end = dummy
 150 };
 151
 152 void __init init_IRQ(void)
 153 {
 154         int i;
 155
 156         irq_desc[TIMER_IRQ].status = IRQ_DISABLED;
 157         irq_desc[TIMER_IRQ].action = 0;
 158         irq_desc[TIMER_IRQ].depth = 1;
 159         irq_desc[TIMER_IRQ].handler = &SIGVTALRM_irq_type;
 160         enable_irq(TIMER_IRQ);
 161         for(i=1;i<NR_IRQS;i++){
 162                 irq_desc[i].status = IRQ_DISABLED;
 163                 irq_desc[i].action = 0;
 164                 irq_desc[i].depth = 1;
 165                 irq_desc[i].handler = &SIGIO_irq_type;
 166                 enable_irq(i);
 167         }
 168         init_irq_signals(0);
 169 }
 170
 171 /*
 172  * Overrides for Emacs so that we follow Linus's tabbing style.
 173  * Emacs will notice this stuff at the end of the file and automatically
 174  * adjust the settings for this buffer only.  This must remain at the end
 175  * of the file.
 176  * ---------------------------------------------------------------------------
 177  * Local variables:
 178  * c-file-style: "linux"
 179  * End:
 180  */