ia64/linux-2.6.18-xen.hg

view drivers/char/hvc_console.h @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
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 */
27 #ifndef HVC_CONSOLE_H
28 #define HVC_CONSOLE_H
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
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
46 /* implemented by a low level driver */
47 struct 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 };
52 struct hvc_struct;
54 /* Register a vterm and a slot index for use as a console (console_init) */
55 extern int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops);
57 /* register a vterm for hvc tty operation (module_init or hotplug add) */
58 extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int irq,
59 struct hv_ops *ops);
60 /* remove a vterm from hvc tty operation (modele_exit or hotplug remove) */
61 extern int __devexit hvc_remove(struct hvc_struct *hp);
63 #endif // HVC_CONSOLE_H