blob: 128d766a340c4d72aeff6cd9035e0501260952a9 (
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
|
/******************************************************************************
* evtchn.h
*
* Communication via Xen event channels.
* Also definitions for the device that demuxes notifications to userspace.
*
* Copyright (c) 2004, K A Fraser
*/
#ifndef __ASM_EVTCHN_H__
#define __ASM_EVTCHN_H__
#include <linux/config.h>
#include <asm/hypervisor.h>
#include <asm/ptrace.h>
#include <asm/synch_bitops.h>
#include <asm/hypervisor-ifs/event_channel.h>
/*
* LOW-LEVEL DEFINITIONS
*/
/* Entry point for notifications into Linux subsystems. */
void evtchn_do_upcall(struct pt_regs *regs);
/* Entry point for notifications into the userland character device. */
void evtchn_device_upcall(int port);
static inline void mask_evtchn(int port)
{
shared_info_t *s = HYPERVISOR_shared_info;
synch_set_bit(port, &s->evtchn_mask[0]);
}
static inline void unmask_evtchn(int port)
{
shared_info_t *s = HYPERVISOR_shared_info;
synch_clear_bit(port, &s->evtchn_mask[0]);
/*
* The following is basically the equivalent of 'hw_resend_irq'. Just like
* a real IO-APIC we 'lose the interrupt edge' if the channel is masked.
*/
if ( synch_test_bit (port, &s->evtchn_pending[0]) &&
!synch_test_and_set_bit(port>>5, &s->evtchn_pending_sel) )
{
s->vcpu_data[0].evtchn_upcall_pending = 1;
if ( !s->vcpu_data[0].evtchn_upcall_mask )
evtchn_do_upcall(NULL);
}
}
static inline void clear_evtchn(int port)
{
shared_info_t *s = HYPERVISOR_shared_info;
synch_clear_bit(port, &s->evtchn_pending[0]);
}
static inline void clear_evtchn_exception(int port)
{
shared_info_t *s = HYPERVISOR_shared_info;
synch_clear_bit(port, &s->evtchn_exception[0]);
}
static inline void notify_via_evtchn(int port)
{
evtchn_op_t op;
op.cmd = EVTCHNOP_send;
op.u.send.local_port = port;
(void)HYPERVISOR_event_channel_op(&op);
}
/*
* CHARACTER-DEVICE DEFINITIONS
*/
#define PORT_NORMAL 0x0000
#define PORT_EXCEPTION 0x8000
#define PORTIDX_MASK 0x7fff
/* /dev/xen/evtchn resides at device number major=10, minor=200 */
#define EVTCHN_MINOR 200
/* /dev/xen/evtchn ioctls: */
/* EVTCHN_RESET: Clear and reinit the event buffer. Clear error condition. */
#define EVTCHN_RESET _IO('E', 1)
/* EVTCHN_BIND: Bind to teh specified event-channel port. */
#define EVTCHN_BIND _IO('E', 2)
/* EVTCHN_UNBIND: Unbind from the specified event-channel port. */
#define EVTCHN_UNBIND _IO('E', 3)
#endif /* __ASM_EVTCHN_H__ */
|
