tjh.dev
Linux kernel mirror (for testing)
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linux
1/*
2 * hvc_console.h
3 * Copyright (C) 2005 IBM Corporation
4 *
5 * Author(s):
6 * Ryan S. Arnold <rsa@us.ibm.com>
7 *
8 * hvc_console header information:
9 * moved here from include/asm-powerpc/hvconsole.h
10 * and drivers/char/hvc_console.c
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 */
26
27#ifndef HVC_CONSOLE_H
28#define HVC_CONSOLE_H
29
30/*
31 * This is the max number of console adapters that can/will be found as
32 * console devices on first stage console init. Any number beyond this range
33 * can't be used as a console device but is still a valid tty device.
34 */
35#define MAX_NR_HVC_CONSOLES 16
36
37/*
38 * The Linux TTY code does not support dynamic addition of tty derived devices
39 * so we need to know how many tty devices we might need when space is allocated
40 * for the tty device. Since this driver supports hotplug of vty adapters we
41 * need to make sure we have enough allocated.
42 */
43#define HVC_ALLOC_TTY_ADAPTERS 8
44
45
46/* implemented by a low level driver */
47struct hv_ops {
48 int (*get_chars)(uint32_t vtermno, char *buf, int count);
49 int (*put_chars)(uint32_t vtermno, const char *buf, int count);
50};
51
52struct hvc_struct;
53
54/* Register a vterm and a slot index for use as a console (console_init) */
55extern int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops);
56
57/* register a vterm for hvc tty operation (module_init or hotplug add) */
58extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int irq,
59 struct hv_ops *ops, int outbuf_size);
60/* remove a vterm from hvc tty operation (modele_exit or hotplug remove) */
61extern int __devexit hvc_remove(struct hvc_struct *hp);
62
63#endif // HVC_CONSOLE_H