xref: /openbmc/qemu/chardev/chardev-internal.h (revision ea9cea93)
1 /*
2  * QEMU Character device internals
3  *
4  * Copyright (c) 2003-2008 Fabrice Bellard
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 
25 #ifndef CHARDEV_INTERNAL_H
26 #define CHARDEV_INTERNAL_H
27 
28 #include "chardev/char.h"
29 #include "chardev/char-fe.h"
30 #include "qom/object.h"
31 
32 #define MAX_MUX 4
33 #define MUX_BUFFER_SIZE 32 /* Must be a power of 2.  */
34 #define MUX_BUFFER_MASK (MUX_BUFFER_SIZE - 1)
35 
36 struct MuxChardev {
37     Chardev parent;
38     CharBackend *backends[MAX_MUX];
39     CharBackend chr;
40     int focus;
41     int mux_cnt;
42     int term_got_escape;
43     int max_size;
44     /* Intermediate input buffer catches escape sequences even if the
45        currently active device is not accepting any input - but only until it
46        is full as well. */
47     unsigned char buffer[MAX_MUX][MUX_BUFFER_SIZE];
48     int prod[MAX_MUX];
49     int cons[MAX_MUX];
50     int timestamps;
51 
52     /* Protected by the Chardev chr_write_lock.  */
53     int linestart;
54     int64_t timestamps_start;
55 };
56 typedef struct MuxChardev MuxChardev;
57 
58 DECLARE_INSTANCE_CHECKER(MuxChardev, MUX_CHARDEV,
59                          TYPE_CHARDEV_MUX)
60 #define CHARDEV_IS_MUX(chr)                             \
61     object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_MUX)
62 
63 void mux_set_focus(Chardev *chr, int focus);
64 void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event);
65 
66 Object *get_chardevs_root(void);
67 
68 #endif /* CHARDEV_INTERNAL_H */
69