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1 | /* | |
2 | * Virtio Console and Generic Serial Port Devices | |
3 | * | |
4 | * Copyright Red Hat, Inc. 2009, 2010 | |
5 | * | |
6 | * Authors: | |
7 | * Amit Shah <amit.shah@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | */ | |
12 | ||
13 | #include "qemu-char.h" | |
14 | #include "virtio-serial.h" | |
15 | ||
16 | typedef struct VirtConsole { | |
17 | VirtIOSerialPort port; | |
18 | CharDriverState *chr; | |
19 | } VirtConsole; | |
20 | ||
21 | ||
22 | /* Callback function that's called when the guest sends us data */ | |
23 | static void flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len) | |
24 | { | |
25 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
26 | ||
27 | qemu_chr_write(vcon->chr, buf, len); | |
28 | } | |
29 | ||
30 | /* Readiness of the guest to accept data on a port */ | |
31 | static int chr_can_read(void *opaque) | |
32 | { | |
33 | VirtConsole *vcon = opaque; | |
34 | ||
35 | return virtio_serial_guest_ready(&vcon->port); | |
36 | } | |
37 | ||
38 | /* Send data from a char device over to the guest */ | |
39 | static void chr_read(void *opaque, const uint8_t *buf, int size) | |
40 | { | |
41 | VirtConsole *vcon = opaque; | |
42 | ||
43 | virtio_serial_write(&vcon->port, buf, size); | |
44 | } | |
45 | ||
46 | static void chr_event(void *opaque, int event) | |
47 | { | |
48 | VirtConsole *vcon = opaque; | |
49 | ||
50 | switch (event) { | |
51 | case CHR_EVENT_OPENED: { | |
52 | virtio_serial_open(&vcon->port); | |
53 | break; | |
54 | } | |
55 | case CHR_EVENT_CLOSED: | |
56 | virtio_serial_close(&vcon->port); | |
57 | break; | |
58 | } | |
59 | } | |
60 | ||
61 | /* Virtio Console Ports */ | |
62 | static int virtconsole_initfn(VirtIOSerialDevice *dev) | |
63 | { | |
64 | VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev); | |
65 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
66 | ||
67 | port->info = dev->info; | |
68 | ||
69 | port->is_console = true; | |
70 | ||
71 | if (vcon->chr) { | |
72 | qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event, | |
73 | vcon); | |
74 | port->info->have_data = flush_buf; | |
75 | } | |
76 | return 0; | |
77 | } | |
78 | ||
79 | static int virtconsole_exitfn(VirtIOSerialDevice *dev) | |
80 | { | |
81 | VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev); | |
82 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
83 | ||
84 | if (vcon->chr) { | |
85 | port->info->have_data = NULL; | |
86 | qemu_chr_close(vcon->chr); | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | static VirtIOSerialPortInfo virtconsole_info = { | |
93 | .qdev.name = "virtconsole", | |
94 | .qdev.size = sizeof(VirtConsole), | |
95 | .init = virtconsole_initfn, | |
96 | .exit = virtconsole_exitfn, | |
97 | .qdev.props = (Property[]) { | |
98 | DEFINE_PROP_UINT8("is_console", VirtConsole, port.is_console, 1), | |
99 | DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID), | |
100 | DEFINE_PROP_CHR("chardev", VirtConsole, chr), | |
101 | DEFINE_PROP_STRING("name", VirtConsole, port.name), | |
102 | DEFINE_PROP_END_OF_LIST(), | |
103 | }, | |
104 | }; | |
105 | ||
106 | static void virtconsole_register(void) | |
107 | { | |
108 | virtio_serial_port_qdev_register(&virtconsole_info); | |
109 | } | |
110 | device_init(virtconsole_register) | |
111 | ||
112 | /* Generic Virtio Serial Ports */ | |
113 | static int virtserialport_initfn(VirtIOSerialDevice *dev) | |
114 | { | |
115 | VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev); | |
116 | VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port); | |
117 | ||
118 | port->info = dev->info; | |
119 | ||
120 | if (vcon->chr) { | |
121 | qemu_chr_add_handlers(vcon->chr, chr_can_read, chr_read, chr_event, | |
122 | vcon); | |
123 | port->info->have_data = flush_buf; | |
124 | } | |
125 | return 0; | |
126 | } | |
127 | ||
128 | static VirtIOSerialPortInfo virtserialport_info = { | |
129 | .qdev.name = "virtserialport", | |
130 | .qdev.size = sizeof(VirtConsole), | |
131 | .init = virtserialport_initfn, | |
132 | .exit = virtconsole_exitfn, | |
133 | .qdev.props = (Property[]) { | |
134 | DEFINE_PROP_UINT32("nr", VirtConsole, port.id, VIRTIO_CONSOLE_BAD_ID), | |
135 | DEFINE_PROP_CHR("chardev", VirtConsole, chr), | |
136 | DEFINE_PROP_STRING("name", VirtConsole, port.name), | |
137 | DEFINE_PROP_END_OF_LIST(), | |
138 | }, | |
139 | }; | |
140 | ||
141 | static void virtserialport_register(void) | |
142 | { | |
143 | virtio_serial_port_qdev_register(&virtserialport_info); | |
144 | } | |
145 | device_init(virtserialport_register) |