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
|
/* -*- Mode:C; c-basic-offset:4; tab-width:4 -*-
****************************************************************************
* (C) 2003 - Rolf Neugebauer - Intel Research Cambridge
****************************************************************************
*
* File: events.c
* Author: Rolf Neugebauer (neugebar@dcs.gla.ac.uk)
* Changes:
*
* Date: Jul 2003
*
* Environment: Xen Minimal OS
* Description: Deal with events
*
****************************************************************************
* $Id: c-insert.c,v 1.7 2002/11/08 16:04:34 rn Exp $
****************************************************************************
*/
#include <os.h>
#include <hypervisor.h>
#include <events.h>
#include <lib.h>
static ev_action_t ev_actions[NR_EVS];
void default_handler(int ev, struct pt_regs *regs);
/*
* demux events to different handlers
*/
unsigned int do_event(int ev, struct pt_regs *regs)
{
ev_action_t *action;
if (ev >= NR_EVS) {
printk("Large event number %d\n", ev);
return 0;
}
action = &ev_actions[ev];
action->count++;
ack_hypervisor_event(ev);
if (!action->handler)
goto out;
if (action->status & EVS_DISABLED)
goto out;
/* call the handler */
action->handler(ev, regs);
out:
return 1;
}
/*
* add a handler
*/
unsigned int add_ev_action( int ev, void (*handler)(int, struct pt_regs *) )
{
if (ev_actions[ev].handler) {
printk ("event[%d] already handled by %p", ev, ev_actions[ev].handler);
return 0;
}
ev_actions[ev].handler = handler;
return 1;
}
unsigned int enable_ev_action( int ev )
{
if (!ev_actions[ev].handler) {
printk ("enable event[%d], no handler installed", ev);
return 0;
}
ev_actions[ev].status &= ~EVS_DISABLED;
return 1;
}
unsigned int disable_ev_action( int ev )
{
ev_actions[ev].status |= EVS_DISABLED;
return 1;
}
/*
* initially all events are without a handler and disabled
*/
void init_events(void)
{
int i;
/* inintialise event handler */
for ( i = 0; i < NR_EVS; i++ )
{
ev_actions[i].status = EVS_DISABLED;
ev_actions[i].handler = NULL;
}
}
void default_handler(int ev, struct pt_regs *regs) {
printk("X[%d] ", ev);
}
|