chardev/chardev-internal.h

   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     unsigned long mux_bitset;
  41     int focus;
  42     bool term_got_escape;
  43     /* Intermediate input buffer catches escape sequences even if the
  44        currently active device is not accepting any input - but only until it
  45        is full as well. */
  46     unsigned char buffer[MAX_MUX][MUX_BUFFER_SIZE];
  47     unsigned int prod[MAX_MUX];
  48     unsigned int cons[MAX_MUX];
  49     int timestamps;
  50
  51     /* Protected by the Chardev chr_write_lock.  */
  52     bool linestart;
  53     int64_t timestamps_start;
  54 };
  55 typedef struct MuxChardev MuxChardev;
  56
  57 DECLARE_INSTANCE_CHECKER(MuxChardev, MUX_CHARDEV,
  58                          TYPE_CHARDEV_MUX)
  59 #define CHARDEV_IS_MUX(chr)                             \
  60     object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_MUX)
  61
  62 bool mux_chr_attach_frontend(MuxChardev *d, CharBackend *b,
  63                              unsigned int *tag, Error **errp);
  64 bool mux_chr_detach_frontend(MuxChardev *d, unsigned int tag);
  65 void mux_set_focus(Chardev *chr, unsigned int focus);
  66 void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event);
  67
  68 Object *get_chardevs_root(void);
  69
  70 #endif /* CHARDEV_INTERNAL_H */