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Linux/include/linux/console.h

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  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/atomic.h>
 18 #include <linux/types.h>
 19 
 20 struct vc_data;
 21 struct console_font_op;
 22 struct console_font;
 23 struct module;
 24 struct tty_struct;
 25 struct notifier_block;
 26 
 27 /*
 28  * this is what the terminal answers to a ESC-Z or csi0c query.
 29  */
 30 #define VT100ID "\033[?1;2c"
 31 #define VT102ID "\033[?6c"
 32 
 33 enum con_scroll {
 34         SM_UP,
 35         SM_DOWN,
 36 };
 37 
 38 /**
 39  * struct consw - callbacks for consoles
 40  *
 41  * @con_scroll: move lines from @top to @bottom in direction @dir by @lines.
 42  *              Return true if no generic handling should be done.
 43  *              Invoked by csi_M and printing to the console.
 44  * @con_set_palette: sets the palette of the console to @table (optional)
 45  * @con_scrolldelta: the contents of the console should be scrolled by @lines.
 46  *                   Invoked by user. (optional)
 47  */
 48 struct consw {
 49         struct module *owner;
 50         const char *(*con_startup)(void);
 51         void    (*con_init)(struct vc_data *vc, int init);
 52         void    (*con_deinit)(struct vc_data *vc);
 53         void    (*con_clear)(struct vc_data *vc, int sy, int sx, int height,
 54                         int width);
 55         void    (*con_putc)(struct vc_data *vc, int c, int ypos, int xpos);
 56         void    (*con_putcs)(struct vc_data *vc, const unsigned short *s,
 57                         int count, int ypos, int xpos);
 58         void    (*con_cursor)(struct vc_data *vc, int mode);
 59         bool    (*con_scroll)(struct vc_data *vc, unsigned int top,
 60                         unsigned int bottom, enum con_scroll dir,
 61                         unsigned int lines);
 62         int     (*con_switch)(struct vc_data *vc);
 63         int     (*con_blank)(struct vc_data *vc, int blank, int mode_switch);
 64         int     (*con_font_set)(struct vc_data *vc, struct console_font *font,
 65                         unsigned int flags);
 66         int     (*con_font_get)(struct vc_data *vc, struct console_font *font);
 67         int     (*con_font_default)(struct vc_data *vc,
 68                         struct console_font *font, char *name);
 69         int     (*con_font_copy)(struct vc_data *vc, int con);
 70         int     (*con_resize)(struct vc_data *vc, unsigned int width,
 71                         unsigned int height, unsigned int user);
 72         void    (*con_set_palette)(struct vc_data *vc,
 73                         const unsigned char *table);
 74         void    (*con_scrolldelta)(struct vc_data *vc, int lines);
 75         int     (*con_set_origin)(struct vc_data *vc);
 76         void    (*con_save_screen)(struct vc_data *vc);
 77         u8      (*con_build_attr)(struct vc_data *vc, u8 color, u8 intensity,
 78                         u8 blink, u8 underline, u8 reverse, u8 italic);
 79         void    (*con_invert_region)(struct vc_data *vc, u16 *p, int count);
 80         u16    *(*con_screen_pos)(struct vc_data *vc, int offset);
 81         unsigned long (*con_getxy)(struct vc_data *vc, unsigned long position,
 82                         int *px, int *py);
 83         /*
 84          * Flush the video console driver's scrollback buffer
 85          */
 86         void    (*con_flush_scrollback)(struct vc_data *vc);
 87         /*
 88          * Prepare the console for the debugger.  This includes, but is not
 89          * limited to, unblanking the console, loading an appropriate
 90          * palette, and allowing debugger generated output.
 91          */
 92         int     (*con_debug_enter)(struct vc_data *vc);
 93         /*
 94          * Restore the console to its pre-debug state as closely as possible.
 95          */
 96         int     (*con_debug_leave)(struct vc_data *vc);
 97 };
 98 
 99 extern const struct consw *conswitchp;
100 
101 extern const struct consw dummy_con;    /* dummy console buffer */
102 extern const struct consw vga_con;      /* VGA text console */
103 extern const struct consw newport_con;  /* SGI Newport console  */
104 
105 int con_is_bound(const struct consw *csw);
106 int do_unregister_con_driver(const struct consw *csw);
107 int do_take_over_console(const struct consw *sw, int first, int last, int deflt);
108 void give_up_console(const struct consw *sw);
109 #ifdef CONFIG_HW_CONSOLE
110 int con_debug_enter(struct vc_data *vc);
111 int con_debug_leave(void);
112 #else
113 static inline int con_debug_enter(struct vc_data *vc)
114 {
115         return 0;
116 }
117 static inline int con_debug_leave(void)
118 {
119         return 0;
120 }
121 #endif
122 
123 /* cursor */
124 #define CM_DRAW     (1)
125 #define CM_ERASE    (2)
126 #define CM_MOVE     (3)
127 
128 /*
129  * The interface for a console, or any other device that wants to capture
130  * console messages (printer driver?)
131  *
132  * If a console driver is marked CON_BOOT then it will be auto-unregistered
133  * when the first real console is registered.  This is for early-printk drivers.
134  */
135 
136 #define CON_PRINTBUFFER (1)
137 #define CON_CONSDEV     (2) /* Preferred console, /dev/console */
138 #define CON_ENABLED     (4)
139 #define CON_BOOT        (8)
140 #define CON_ANYTIME     (16) /* Safe to call when cpu is offline */
141 #define CON_BRL         (32) /* Used for a braille device */
142 #define CON_EXTENDED    (64) /* Use the extended output format a la /dev/kmsg */
143 
144 struct console {
145         char    name[16];
146         void    (*write)(struct console *, const char *, unsigned);
147         int     (*read)(struct console *, char *, unsigned);
148         struct tty_driver *(*device)(struct console *, int *);
149         void    (*unblank)(void);
150         int     (*setup)(struct console *, char *);
151         int     (*exit)(struct console *);
152         int     (*match)(struct console *, char *name, int idx, char *options);
153         short   flags;
154         short   index;
155         int     cflag;
156         void    *data;
157         struct   console *next;
158 };
159 
160 /*
161  * for_each_console() allows you to iterate on each console
162  */
163 #define for_each_console(con) \
164         for (con = console_drivers; con != NULL; con = con->next)
165 
166 extern int console_set_on_cmdline;
167 extern struct console *early_console;
168 
169 enum con_flush_mode {
170         CONSOLE_FLUSH_PENDING,
171         CONSOLE_REPLAY_ALL,
172 };
173 
174 extern int add_preferred_console(char *name, int idx, char *options);
175 extern void register_console(struct console *);
176 extern int unregister_console(struct console *);
177 extern struct console *console_drivers;
178 extern void console_lock(void);
179 extern int console_trylock(void);
180 extern void console_unlock(void);
181 extern void console_conditional_schedule(void);
182 extern void console_unblank(void);
183 extern void console_flush_on_panic(enum con_flush_mode mode);
184 extern struct tty_driver *console_device(int *);
185 extern void console_stop(struct console *);
186 extern void console_start(struct console *);
187 extern int is_console_locked(void);
188 extern int braille_register_console(struct console *, int index,
189                 char *console_options, char *braille_options);
190 extern int braille_unregister_console(struct console *);
191 #ifdef CONFIG_TTY
192 extern void console_sysfs_notify(void);
193 #else
194 static inline void console_sysfs_notify(void)
195 { }
196 #endif
197 extern bool console_suspend_enabled;
198 
199 /* Suspend and resume console messages over PM events */
200 extern void suspend_console(void);
201 extern void resume_console(void);
202 
203 int mda_console_init(void);
204 
205 void vcs_make_sysfs(int index);
206 void vcs_remove_sysfs(int index);
207 
208 /* Some debug stub to catch some of the obvious races in the VT code */
209 #define WARN_CONSOLE_UNLOCKED()                                         \
210         WARN_ON(!atomic_read(&ignore_console_lock_warning) &&           \
211                 !is_console_locked() && !oops_in_progress)
212 /*
213  * Increment ignore_console_lock_warning if you need to quiet
214  * WARN_CONSOLE_UNLOCKED() for debugging purposes.
215  */
216 extern atomic_t ignore_console_lock_warning;
217 
218 /* VESA Blanking Levels */
219 #define VESA_NO_BLANKING        0
220 #define VESA_VSYNC_SUSPEND      1
221 #define VESA_HSYNC_SUSPEND      2
222 #define VESA_POWERDOWN          3
223 
224 #ifdef CONFIG_VGA_CONSOLE
225 extern bool vgacon_text_force(void);
226 #else
227 static inline bool vgacon_text_force(void) { return false; }
228 #endif
229 
230 extern void console_init(void);
231 
232 /* For deferred console takeover */
233 void dummycon_register_output_notifier(struct notifier_block *nb);
234 void dummycon_unregister_output_notifier(struct notifier_block *nb);
235 
236 #endif /* _LINUX_CONSOLE_H */
237 

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