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/*
* QEMU Character device internals
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef CHARDEV_INTERNAL_H
#define CHARDEV_INTERNAL_H
#include "chardev/char.h"
#include "chardev/char-fe.h"
#include "qom/object.h"
#define MAX_HUB 4
#define MAX_MUX 4
#define MUX_BUFFER_SIZE 32 /* Must be a power of 2. */
#define MUX_BUFFER_MASK (MUX_BUFFER_SIZE - 1)
struct MuxChardev {
Chardev parent;
/* Linked frontends */
CharBackend *backends[MAX_MUX];
/* Linked backend */
CharBackend chr;
unsigned long mux_bitset;
int focus;
bool term_got_escape;
/* Intermediate input buffer catches escape sequences even if the
currently active device is not accepting any input - but only until it
is full as well. */
unsigned char buffer[MAX_MUX][MUX_BUFFER_SIZE];
unsigned int prod[MAX_MUX];
unsigned int cons[MAX_MUX];
int timestamps;
/* Protected by the Chardev chr_write_lock. */
bool linestart;
int64_t timestamps_start;
};
typedef struct MuxChardev MuxChardev;
typedef struct HubChardev HubChardev;
typedef struct HubCharBackend HubCharBackend;
/*
* Back-pointer on a hub, actual backend and its index in
* `hub->backends` array
*/
struct HubCharBackend {
HubChardev *hub;
CharBackend be;
unsigned int be_ind;
};
struct HubChardev {
Chardev parent;
/* Linked backends */
HubCharBackend backends[MAX_HUB];
/*
* Number of backends attached to this hub. Once attached, a
* backend can't be detached, so the counter is only increasing.
* To safely remove a backend, hub has to be removed first.
*/
unsigned int be_cnt;
/*
* Number of CHR_EVEN_OPENED events from all backends. Needed to
* send CHR_EVEN_CLOSED only when counter goes to zero.
*/
unsigned int be_event_opened_cnt;
/*
* Counters of written bytes from a single frontend device
* to multiple backend devices.
*/
unsigned int be_written[MAX_HUB];
unsigned int be_min_written;
/*
* Index of a backend device which got EAGAIN on last write,
* -1 is invalid index.
*/
int be_eagain_ind;
};
typedef struct HubChardev HubChardev;
DECLARE_INSTANCE_CHECKER(MuxChardev, MUX_CHARDEV,
TYPE_CHARDEV_MUX)
DECLARE_INSTANCE_CHECKER(HubChardev, HUB_CHARDEV,
TYPE_CHARDEV_HUB)
#define CHARDEV_IS_MUX(chr) \
object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_MUX)
#define CHARDEV_IS_HUB(chr) \
object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_HUB)
bool mux_chr_attach_frontend(MuxChardev *d, CharBackend *b,
unsigned int *tag, Error **errp);
bool mux_chr_detach_frontend(MuxChardev *d, unsigned int tag);
void mux_set_focus(Chardev *chr, unsigned int focus);
void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event);
Object *get_chardevs_root(void);
#endif /* CHARDEV_INTERNAL_H */
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