aboutsummaryrefslogtreecommitdiffstats
path: root/arch/um/kernel/irq.c
blob: bbf94bf2921ed144a6d70990152c1264b8361b33 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
/* 
 * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 * Derived (i.e. mostly copied) from arch/i386/kernel/irq.c:
 *	Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
 */

#include "linux/config.h"
#include "linux/kernel.h"
#include "linux/module.h"
#include "linux/smp.h"
#include "linux/kernel_stat.h"
#include "linux/interrupt.h"
#include "linux/random.h"
#include "linux/slab.h"
#include "linux/file.h"
#include "linux/proc_fs.h"
#include "linux/init.h"
#include "linux/seq_file.h"
#include "linux/profile.h"
#include "linux/hardirq.h"
#include "asm/irq.h"
#include "asm/hw_irq.h"
#include "asm/atomic.h"
#include "asm/signal.h"
#include "asm/system.h"
#include "asm/errno.h"
#include "asm/uaccess.h"
#include "user_util.h"
#include "kern_util.h"
#include "irq_user.h"
#include "irq_kern.h"
#include "os.h"

/*
 * Generic, controller-independent functions:
 */

int show_interrupts(struct seq_file *p, void *v)
{
	int i = *(loff_t *) v, j;
	struct irqaction * action;
	unsigned long flags;

	if (i == 0) {
		seq_printf(p, "           ");
		for_each_online_cpu(j)
			seq_printf(p, "CPU%d       ",j);
		seq_putc(p, '\n');
	}

	if (i < NR_IRQS) {
		spin_lock_irqsave(&irq_desc[i].lock, flags);
		action = irq_desc[i].action;
		if (!action) 
			goto skip;
		seq_printf(p, "%3d: ",i);
#ifndef CONFIG_SMP
		seq_printf(p, "%10u ", kstat_irqs(i));
#else
		for_each_online_cpu(j)
			seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
#endif
		seq_printf(p, " %14s", irq_desc[i].handler->typename);
		seq_printf(p, "  %s", action->name);

		for (action=action->next; action; action = action->next)
			seq_printf(p, ", %s", action->name);

		seq_putc(p, '\n');
skip:
		spin_unlock_irqrestore(&irq_desc[i].lock, flags);
	} else if (i == NR_IRQS) {
		seq_putc(p, '\n');
	}

	return 0;
}

/*
 * do_IRQ handles all normal device IRQ's (the special
 * SMP cross-CPU interrupts have their own specific
 * handlers).
 */
unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
{
       irq_enter();
       __do_IRQ(irq, (struct pt_regs *) regs);
       irq_exit();
       return 1;
}

int um_request_irq(unsigned int irq, int fd, int type,
		   irqreturn_t (*handler)(int, void *, struct pt_regs *),
		   unsigned long irqflags, const char * devname,
		   void *dev_id)
{
	int err;

	err = request_irq(irq, handler, irqflags, devname, dev_id);
	if(err)
		return(err);

	if(fd != -1)
		err = activate_fd(irq, fd, type, dev_id);
	return(err);
}
EXPORT_SYMBOL(um_request_irq);
EXPORT_SYMBOL(reactivate_fd);

static DEFINE_SPINLOCK(irq_spinlock);

unsigned long irq_lock(void)
{
	unsigned long flags;

	spin_lock_irqsave(&irq_spinlock, flags);
	return(flags);
}

void irq_unlock(unsigned long flags)
{
	spin_unlock_irqrestore(&irq_spinlock, flags);
}

/* hw_interrupt_type must define (startup || enable) &&
 * (shutdown || disable) && end */
static void dummy(unsigned int irq)
{
}

/* This is used for everything else than the timer. */
static struct hw_interrupt_type normal_irq_type = {
	.typename = "SIGIO",
	.release = free_irq_by_irq_and_dev,
	.disable = dummy,
	.enable = dummy,
	.ack = dummy,
	.end = dummy
};

static struct hw_interrupt_type SIGVTALRM_irq_type = {
	.typename = "SIGVTALRM",
	.release = free_irq_by_irq_and_dev,
	.shutdown = dummy, /* never called */
	.disable = dummy,
	.enable = dummy,
	.ack = dummy,
	.end = dummy
};

void __init init_IRQ(void)
{
	int i;

	irq_desc[TIMER_IRQ].status = IRQ_DISABLED;
	irq_desc[TIMER_IRQ].action = NULL;
	irq_desc[TIMER_IRQ].depth = 1;
	irq_desc[TIMER_IRQ].handler = &SIGVTALRM_irq_type;
	enable_irq(TIMER_IRQ);
	for(i=1;i<NR_IRQS;i++){
		irq_desc[i].status = IRQ_DISABLED;
		irq_desc[i].action = NULL;
		irq_desc[i].depth = 1;
		irq_desc[i].handler = &normal_irq_type;
		enable_irq(i);
	}
}

int init_aio_irq(int irq, char *name, irqreturn_t (*handler)(int, void *,
							     struct pt_regs *))
{
	int fds[2], err;

	err = os_pipe(fds, 1, 1);
	if(err){
		printk("init_aio_irq - os_pipe failed, err = %d\n", -err);
		goto out;
	}

	err = um_request_irq(irq, fds[0], IRQ_READ, handler,
			     SA_INTERRUPT | SA_SAMPLE_RANDOM, name,
			     (void *) (long) fds[0]);
	if(err){
		printk("init_aio_irq - : um_request_irq failed, err = %d\n",
		       err);
		goto out_close;
	}

	err = fds[1];
	goto out;

 out_close:
	os_close_file(fds[0]);
	os_close_file(fds[1]);
 out:
	return(err);
}