aboutsummaryrefslogtreecommitdiff
path: root/include/char/char.h
blob: baa5d035fddadfa2fbc2a6787a98da30ae9000e9 (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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
#ifndef QEMU_CHAR_H
#define QEMU_CHAR_H

#include "qemu-common.h"
#include "qemu/queue.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "block/aio.h"
#include "qapi/qmp/qobject.h"
#include "qapi/qmp/qstring.h"
#include "qemu/main-loop.h"

/* character device */

#define CHR_EVENT_BREAK   0 /* serial break char */
#define CHR_EVENT_FOCUS   1 /* focus to this terminal (modal input needed) */
#define CHR_EVENT_OPENED  2 /* new connection established */
#define CHR_EVENT_MUX_IN  3 /* mux-focus was set to this terminal */
#define CHR_EVENT_MUX_OUT 4 /* mux-focus will move on */
#define CHR_EVENT_CLOSED  5 /* connection closed */


#define CHR_IOCTL_SERIAL_SET_PARAMS   1
typedef struct {
    int speed;
    int parity;
    int data_bits;
    int stop_bits;
} QEMUSerialSetParams;

#define CHR_IOCTL_SERIAL_SET_BREAK    2

#define CHR_IOCTL_PP_READ_DATA        3
#define CHR_IOCTL_PP_WRITE_DATA       4
#define CHR_IOCTL_PP_READ_CONTROL     5
#define CHR_IOCTL_PP_WRITE_CONTROL    6
#define CHR_IOCTL_PP_READ_STATUS      7
#define CHR_IOCTL_PP_EPP_READ_ADDR    8
#define CHR_IOCTL_PP_EPP_READ         9
#define CHR_IOCTL_PP_EPP_WRITE_ADDR  10
#define CHR_IOCTL_PP_EPP_WRITE       11
#define CHR_IOCTL_PP_DATA_DIR        12

#define CHR_IOCTL_SERIAL_SET_TIOCM   13
#define CHR_IOCTL_SERIAL_GET_TIOCM   14

#define CHR_TIOCM_CTS	0x020
#define CHR_TIOCM_CAR	0x040
#define CHR_TIOCM_DSR	0x100
#define CHR_TIOCM_RI	0x080
#define CHR_TIOCM_DTR	0x002
#define CHR_TIOCM_RTS	0x004

typedef void IOEventHandler(void *opaque, int event);

struct CharDriverState {
    void (*init)(struct CharDriverState *s);
    int (*chr_write)(struct CharDriverState *s, const uint8_t *buf, int len);
    void (*chr_update_read_handler)(struct CharDriverState *s);
    int (*chr_ioctl)(struct CharDriverState *s, int cmd, void *arg);
    int (*get_msgfd)(struct CharDriverState *s);
    int (*chr_add_client)(struct CharDriverState *chr, int fd);
    IOEventHandler *chr_event;
    IOCanReadHandler *chr_can_read;
    IOReadHandler *chr_read;
    void *handler_opaque;
    void (*chr_close)(struct CharDriverState *chr);
    void (*chr_accept_input)(struct CharDriverState *chr);
    void (*chr_set_echo)(struct CharDriverState *chr, bool echo);
    void (*chr_guest_open)(struct CharDriverState *chr);
    void (*chr_guest_close)(struct CharDriverState *chr);
    void *opaque;
    QEMUTimer *open_timer;
    char *label;
    char *filename;
    int opened;
    int avail_connections;
    QTAILQ_ENTRY(CharDriverState) next;
};

/**
 * @qemu_chr_new_from_opts:
 *
 * Create a new character backend from a QemuOpts list.
 *
 * @opts see qemu-config.c for a list of valid options
 * @init not sure..
 *
 * Returns: a new character backend
 */
CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
                                    void (*init)(struct CharDriverState *s));

/**
 * @qemu_chr_new:
 *
 * Create a new character backend from a URI.
 *
 * @label the name of the backend
 * @filename the URI
 * @init not sure..
 *
 * Returns: a new character backend
 */
CharDriverState *qemu_chr_new(const char *label, const char *filename,
                              void (*init)(struct CharDriverState *s));

/**
 * @qemu_chr_delete:
 *
 * Destroy a character backend.
 */
void qemu_chr_delete(CharDriverState *chr);

/**
 * @qemu_chr_fe_set_echo:
 *
 * Ask the backend to override its normal echo setting.  This only really
 * applies to the stdio backend and is used by the QMP server such that you
 * can see what you type if you try to type QMP commands.
 *
 * @echo true to enable echo, false to disable echo
 */
void qemu_chr_fe_set_echo(struct CharDriverState *chr, bool echo);

/**
 * @qemu_chr_fe_open:
 *
 * Open a character backend.  This function call is an indication that the
 * front end is ready to begin doing I/O.
 */
void qemu_chr_fe_open(struct CharDriverState *chr);

/**
 * @qemu_chr_fe_close:
 *
 * Close a character backend.  This function call indicates that the front end
 * no longer is able to process I/O.  To process I/O again, the front end will
 * call @qemu_chr_fe_open.
 */
void qemu_chr_fe_close(struct CharDriverState *chr);

/**
 * @qemu_chr_fe_printf:
 *
 * Write to a character backend using a printf style interface.
 *
 * @fmt see #printf
 */
void qemu_chr_fe_printf(CharDriverState *s, const char *fmt, ...)
    GCC_FMT_ATTR(2, 3);

/**
 * @qemu_chr_fe_write:
 *
 * Write data to a character backend from the front end.  This function will
 * send data from the front end to the back end.
 *
 * @buf the data
 * @len the number of bytes to send
 *
 * Returns: the number of bytes consumed
 */
int qemu_chr_fe_write(CharDriverState *s, const uint8_t *buf, int len);

/**
 * @qemu_chr_fe_ioctl:
 *
 * Issue a device specific ioctl to a backend.
 *
 * @cmd see CHR_IOCTL_*
 * @arg the data associated with @cmd
 *
 * Returns: if @cmd is not supported by the backend, -ENOTSUP, otherwise the
 *          return value depends on the semantics of @cmd
 */
int qemu_chr_fe_ioctl(CharDriverState *s, int cmd, void *arg);

/**
 * @qemu_chr_fe_get_msgfd:
 *
 * For backends capable of fd passing, return the latest file descriptor passed
 * by a client.
 *
 * Returns: -1 if fd passing isn't supported or there is no pending file
 *          descriptor.  If a file descriptor is returned, subsequent calls to
 *          this function will return -1 until a client sends a new file
 *          descriptor.
 */
int qemu_chr_fe_get_msgfd(CharDriverState *s);

/**
 * @qemu_chr_be_can_write:
 *
 * Determine how much data the front end can currently accept.  This function
 * returns the number of bytes the front end can accept.  If it returns 0, the
 * front end cannot receive data at the moment.  The function must be polled
 * to determine when data can be received.
 *
 * Returns: the number of bytes the front end can receive via @qemu_chr_be_write
 */
int qemu_chr_be_can_write(CharDriverState *s);

/**
 * @qemu_chr_be_write:
 *
 * Write data from the back end to the front end.  Before issuing this call,
 * the caller should call @qemu_chr_be_can_write to determine how much data
 * the front end can currently accept.
 *
 * @buf a buffer to receive data from the front end
 * @len the number of bytes to receive from the front end
 */
void qemu_chr_be_write(CharDriverState *s, uint8_t *buf, int len);


/**
 * @qemu_chr_be_event:
 *
 * Send an event from the back end to the front end.
 *
 * @event the event to send
 */
void qemu_chr_be_event(CharDriverState *s, int event);

void qemu_chr_add_handlers(CharDriverState *s,
                           IOCanReadHandler *fd_can_read,
                           IOReadHandler *fd_read,
                           IOEventHandler *fd_event,
                           void *opaque);

void qemu_chr_generic_open(CharDriverState *s);
void qemu_chr_accept_input(CharDriverState *s);
int qemu_chr_add_client(CharDriverState *s, int fd);
void qemu_chr_info_print(Monitor *mon, const QObject *ret_data);
void qemu_chr_info(Monitor *mon, QObject **ret_data);
CharDriverState *qemu_chr_find(const char *name);

QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename);

/* add an eventfd to the qemu devices that are polled */
CharDriverState *qemu_chr_open_eventfd(int eventfd);

extern int term_escape_char;

/* memory chardev */
void qemu_chr_init_mem(CharDriverState *chr);
void qemu_chr_close_mem(CharDriverState *chr);
QString *qemu_chr_mem_to_qs(CharDriverState *chr);
size_t qemu_chr_mem_osize(const CharDriverState *chr);

CharDriverState *qemu_char_get_next_serial(void);

#endif