Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * linux/include/linux/console.h
3 *
4 * Copyright (C) 1993 Hamish Macdonald
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
8 * for more details.
9 *
10 * Changed:
11 * 10-Mar-94: Arno Griffioen: Conversion for vt100 emulator port from PC LINUX
12 */
13
14#ifndef _LINUX_CONSOLE_H_
15#define _LINUX_CONSOLE_H_ 1
16
17#include <linux/types.h>
18
19struct vc_data;
20struct console_font_op;
21struct console_font;
22struct module;
23struct tty_struct;
24
25/*
26 * this is what the terminal answers to a ESC-Z or csi0c query.
27 */
28#define VT100ID "\033[?1;2c"
29#define VT102ID "\033[?6c"
30
31enum con_scroll {
32 SM_UP,
33 SM_DOWN,
34};
35
36/**
37 * struct consw - callbacks for consoles
38 *
39 * @con_scroll: move lines from @top to @bottom in direction @dir by @lines.
40 * Return true if no generic handling should be done.
41 * Invoked by csi_M and printing to the console.
42 * @con_set_palette: sets the palette of the console to @table (optional)
43 * @con_scrolldelta: the contents of the console should be scrolled by @lines.
44 * Invoked by user. (optional)
45 */
46struct consw {
47 struct module *owner;
48 const char *(*con_startup)(void);
49 void (*con_init)(struct vc_data *, int);
50 void (*con_deinit)(struct vc_data *);
51 void (*con_clear)(struct vc_data *, int, int, int, int);
52 void (*con_putc)(struct vc_data *, int, int, int);
53 void (*con_putcs)(struct vc_data *, const unsigned short *, int, int, int);
54 void (*con_cursor)(struct vc_data *, int);
55 bool (*con_scroll)(struct vc_data *, unsigned int top,
56 unsigned int bottom, enum con_scroll dir,
57 unsigned int lines);
58 int (*con_switch)(struct vc_data *);
59 int (*con_blank)(struct vc_data *, int, int);
60 int (*con_font_set)(struct vc_data *, struct console_font *, unsigned);
61 int (*con_font_get)(struct vc_data *, struct console_font *);
62 int (*con_font_default)(struct vc_data *, struct console_font *, char *);
63 int (*con_font_copy)(struct vc_data *, int);
64 int (*con_resize)(struct vc_data *, unsigned int, unsigned int,
65 unsigned int);
66 void (*con_set_palette)(struct vc_data *,
67 const unsigned char *table);
68 void (*con_scrolldelta)(struct vc_data *, int lines);
69 int (*con_set_origin)(struct vc_data *);
70 void (*con_save_screen)(struct vc_data *);
71 u8 (*con_build_attr)(struct vc_data *, u8, u8, u8, u8, u8, u8);
72 void (*con_invert_region)(struct vc_data *, u16 *, int);
73 u16 *(*con_screen_pos)(struct vc_data *, int);
74 unsigned long (*con_getxy)(struct vc_data *, unsigned long, int *, int *);
75 /*
76 * Flush the video console driver's scrollback buffer
77 */
78 void (*con_flush_scrollback)(struct vc_data *);
79 /*
80 * Prepare the console for the debugger. This includes, but is not
81 * limited to, unblanking the console, loading an appropriate
82 * palette, and allowing debugger generated output.
83 */
84 int (*con_debug_enter)(struct vc_data *);
85 /*
86 * Restore the console to its pre-debug state as closely as possible.
87 */
88 int (*con_debug_leave)(struct vc_data *);
89};
90
91extern const struct consw *conswitchp;
92
93extern const struct consw dummy_con; /* dummy console buffer */
94extern const struct consw vga_con; /* VGA text console */
95extern const struct consw newport_con; /* SGI Newport console */
96extern const struct consw prom_con; /* SPARC PROM console */
97
98int con_is_bound(const struct consw *csw);
99int do_unregister_con_driver(const struct consw *csw);
100int do_take_over_console(const struct consw *sw, int first, int last, int deflt);
101void give_up_console(const struct consw *sw);
102#ifdef CONFIG_HW_CONSOLE
103int con_debug_enter(struct vc_data *vc);
104int con_debug_leave(void);
105#else
106static inline int con_debug_enter(struct vc_data *vc)
107{
108 return 0;
109}
110static inline int con_debug_leave(void)
111{
112 return 0;
113}
114#endif
115
116/* cursor */
117#define CM_DRAW (1)
118#define CM_ERASE (2)
119#define CM_MOVE (3)
120
121/*
122 * The interface for a console, or any other device that wants to capture
123 * console messages (printer driver?)
124 *
125 * If a console driver is marked CON_BOOT then it will be auto-unregistered
126 * when the first real console is registered. This is for early-printk drivers.
127 */
128
129#define CON_PRINTBUFFER (1)
130#define CON_CONSDEV (2) /* Last on the command line */
131#define CON_ENABLED (4)
132#define CON_BOOT (8)
133#define CON_ANYTIME (16) /* Safe to call when cpu is offline */
134#define CON_BRL (32) /* Used for a braille device */
135#define CON_EXTENDED (64) /* Use the extended output format a la /dev/kmsg */
136
137struct console {
138 char name[16];
139 void (*write)(struct console *, const char *, unsigned);
140 int (*read)(struct console *, char *, unsigned);
141 struct tty_driver *(*device)(struct console *, int *);
142 void (*unblank)(void);
143 int (*setup)(struct console *, char *);
144 int (*match)(struct console *, char *name, int idx, char *options);
145 short flags;
146 short index;
147 int cflag;
148 void *data;
149 struct console *next;
150};
151
152/*
153 * for_each_console() allows you to iterate on each console
154 */
155#define for_each_console(con) \
156 for (con = console_drivers; con != NULL; con = con->next)
157
158extern int console_set_on_cmdline;
159extern struct console *early_console;
160
161extern int add_preferred_console(char *name, int idx, char *options);
162extern void register_console(struct console *);
163extern int unregister_console(struct console *);
164extern struct console *console_drivers;
165extern void console_lock(void);
166extern int console_trylock(void);
167extern void console_unlock(void);
168extern void console_conditional_schedule(void);
169extern void console_unblank(void);
170extern void console_flush_on_panic(void);
171extern struct tty_driver *console_device(int *);
172extern void console_stop(struct console *);
173extern void console_start(struct console *);
174extern int is_console_locked(void);
175extern int braille_register_console(struct console *, int index,
176 char *console_options, char *braille_options);
177extern int braille_unregister_console(struct console *);
178#ifdef CONFIG_TTY
179extern void console_sysfs_notify(void);
180#else
181static inline void console_sysfs_notify(void)
182{ }
183#endif
184extern bool console_suspend_enabled;
185
186/* Suspend and resume console messages over PM events */
187extern void suspend_console(void);
188extern void resume_console(void);
189
190int mda_console_init(void);
191void prom_con_init(void);
192
193void vcs_make_sysfs(int index);
194void vcs_remove_sysfs(int index);
195
196/* Some debug stub to catch some of the obvious races in the VT code */
197#if 1
198#define WARN_CONSOLE_UNLOCKED() WARN_ON(!is_console_locked() && !oops_in_progress)
199#else
200#define WARN_CONSOLE_UNLOCKED()
201#endif
202
203/* VESA Blanking Levels */
204#define VESA_NO_BLANKING 0
205#define VESA_VSYNC_SUSPEND 1
206#define VESA_HSYNC_SUSPEND 2
207#define VESA_POWERDOWN 3
208
209#ifdef CONFIG_VGA_CONSOLE
210extern bool vgacon_text_force(void);
211#else
212static inline bool vgacon_text_force(void) { return false; }
213#endif
214
215#endif /* _LINUX_CONSOLE_H */