[ACPI] merge acpi-2.6.12 branch into latest Linux 2.6.13-rc...
[linux-2.6] / 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 /* hw_interrupt_type must define (startup || enable) &&
128  * (shutdown || disable) && end */
129 static void dummy(unsigned int irq)
130 {
131 }
132
133 /* This is used for everything else than the timer. */
134 static struct hw_interrupt_type normal_irq_type = {
135         .typename = "SIGIO",
136         .release = free_irq_by_irq_and_dev,
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         .release = free_irq_by_irq_and_dev,
146         .shutdown = dummy, /* never called */
147         .disable = dummy,
148         .enable = dummy,
149         .ack = dummy,
150         .end = dummy
151 };
152
153 void __init init_IRQ(void)
154 {
155         int i;
156
157         irq_desc[TIMER_IRQ].status = IRQ_DISABLED;
158         irq_desc[TIMER_IRQ].action = NULL;
159         irq_desc[TIMER_IRQ].depth = 1;
160         irq_desc[TIMER_IRQ].handler = &SIGVTALRM_irq_type;
161         enable_irq(TIMER_IRQ);
162         for(i=1;i<NR_IRQS;i++){
163                 irq_desc[i].status = IRQ_DISABLED;
164                 irq_desc[i].action = NULL;
165                 irq_desc[i].depth = 1;
166                 irq_desc[i].handler = &normal_irq_type;
167                 enable_irq(i);
168         }
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  */