LXR linux/include/linux/console.h

   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#include <linux/spinlock.h>
  19
  20struct vc_data;
  21struct console_font_op;
  22struct console_font;
  23struct module;
  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
  31struct consw {
  32        struct module *owner;
  33        const char *(*con_startup)(void);
  34        void    (*con_init)(struct vc_data *, int);
  35        void    (*con_deinit)(struct vc_data *);
  36        void    (*con_clear)(struct vc_data *, int, int, int, int);
  37        void    (*con_putc)(struct vc_data *, int, int, int);
  38        void    (*con_putcs)(struct vc_data *, const unsigned short *, int, int, int);
  39        void    (*con_cursor)(struct vc_data *, int);
  40        int     (*con_scroll)(struct vc_data *, int, int, int, int);
  41        void    (*con_bmove)(struct vc_data *, int, int, int, int, int, int);
  42        int     (*con_switch)(struct vc_data *);
  43        int     (*con_blank)(struct vc_data *, int, int);
  44        int     (*con_font_set)(struct vc_data *, struct console_font *, unsigned);
  45        int     (*con_font_get)(struct vc_data *, struct console_font *);
  46        int     (*con_font_default)(struct vc_data *, struct console_font *, char *);
  47        int     (*con_font_copy)(struct vc_data *, int);
  48        int     (*con_resize)(struct vc_data *, unsigned int, unsigned int);
  49        int     (*con_set_palette)(struct vc_data *, unsigned char *);
  50        int     (*con_scrolldelta)(struct vc_data *, int);
  51        int     (*con_set_origin)(struct vc_data *);
  52        void    (*con_save_screen)(struct vc_data *);
  53        u8      (*con_build_attr)(struct vc_data *, u8, u8, u8, u8, u8);
  54        void    (*con_invert_region)(struct vc_data *, u16 *, int);
  55        u16    *(*con_screen_pos)(struct vc_data *, int);
  56        unsigned long (*con_getxy)(struct vc_data *, unsigned long, int *, int *);
  57};
  58
  59extern const struct consw *conswitchp;
  60
  61extern const struct consw dummy_con;    /* dummy console buffer */
  62extern const struct consw fb_con;       /* frame buffer based console */
  63extern const struct consw vga_con;      /* VGA text console */
  64extern const struct consw newport_con;  /* SGI Newport console  */
  65extern const struct consw prom_con;     /* SPARC PROM console */
  66
  67int take_over_console(const struct consw *sw, int first, int last, int deflt);
  68void give_up_console(const struct consw *sw);
  69
  70/* scroll */
  71#define SM_UP       (1)
  72#define SM_DOWN     (2)
  73
  74/* cursor */
  75#define CM_DRAW     (1)
  76#define CM_ERASE    (2)
  77#define CM_MOVE     (3)
  78
  79/*
  80 *      The interface for a console, or any other device that
  81 *      wants to capture console messages (printer driver?)
  82 */
  83
  84#define CON_PRINTBUFFER (1)
  85#define CON_CONSDEV     (2) /* Last on the command line */
  86#define CON_ENABLED     (4)
  87
  88struct console
  89{
  90        char    name[8];
  91        void    (*write)(struct console *, const char *, unsigned);
  92        int     (*read)(struct console *, char *, unsigned);
  93        struct tty_driver *(*device)(struct console *, int *);
  94        void    (*unblank)(void);
  95        int     (*setup)(struct console *, char *);
  96        short   flags;
  97        short   index;
  98        int     cflag;
  99        void    *data;
 100        struct   console *next;
 101};
 102
 103extern int add_preferred_console(char *name, int idx, char *options);
 104extern void register_console(struct console *);
 105extern int unregister_console(struct console *);
 106extern struct console *console_drivers;
 107extern void acquire_console_sem(void);
 108extern int try_acquire_console_sem(void);
 109extern void release_console_sem(void);
 110extern void console_conditional_schedule(void);
 111extern void console_unblank(void);
 112extern struct tty_driver *console_device(int *);
 113extern void console_stop(struct console *);
 114extern void console_start(struct console *);
 115extern int is_console_locked(void);
 116
 117/* Some debug stub to catch some of the obvious races in the VT code */
 118#if 1
 119#define WARN_CONSOLE_UNLOCKED() WARN_ON(!is_console_locked() && !oops_in_progress)
 120#else
 121#define WARN_CONSOLE_UNLOCKED()
 122#endif
 123
 124/* VESA Blanking Levels */
 125#define VESA_NO_BLANKING        0
 126#define VESA_VSYNC_SUSPEND      1
 127#define VESA_HSYNC_SUSPEND      2
 128#define VESA_POWERDOWN          3
 129
 130#endif /* _LINUX_CONSOLE_H */
 131