4f73bc4dd3
The option allows you to remove TTY and compile without errors. This saves space on systems that won't support TTY interfaces anyway. bloat-o-meter output is below. The bulk of this patch consists of Kconfig changes adding "depends on TTY" to various serial devices and similar drivers that require the TTY layer. Ideally, these dependencies would occur on a common intermediate symbol such as SERIO, but most drivers "select SERIO" rather than "depends on SERIO", and "select" does not respect dependencies. bloat-o-meter output comparing our previous minimal to new minimal by removing TTY. The list is filtered to not show removed entries with awk '$3 != "-"' as the list was very long. add/remove: 0/226 grow/shrink: 2/14 up/down: 6/-35356 (-35350) function old new delta chr_dev_init 166 170 +4 allow_signal 80 82 +2 static.__warned 143 142 -1 disallow_signal 63 62 -1 __set_special_pids 95 94 -1 unregister_console 126 121 -5 start_kernel 546 541 -5 register_console 593 588 -5 copy_from_user 45 40 -5 sys_setsid 128 120 -8 sys_vhangup 32 19 -13 do_exit 1543 1526 -17 bitmap_zero 60 40 -20 arch_local_irq_save 137 117 -20 release_task 674 652 -22 static.spin_unlock_irqrestore 308 260 -48 Signed-off-by: Joe Millenbach <jmillenbach@gmail.com> Reviewed-by: Jamey Sharp <jamey@minilop.net> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
195 lines
6 KiB
C
195 lines
6 KiB
C
/*
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* linux/include/linux/console.h
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*
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* Copyright (C) 1993 Hamish Macdonald
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*
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* Changed:
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* 10-Mar-94: Arno Griffioen: Conversion for vt100 emulator port from PC LINUX
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*/
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#ifndef _LINUX_CONSOLE_H_
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#define _LINUX_CONSOLE_H_ 1
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#include <linux/types.h>
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struct vc_data;
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struct console_font_op;
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struct console_font;
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struct module;
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struct tty_struct;
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/*
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* this is what the terminal answers to a ESC-Z or csi0c query.
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*/
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#define VT100ID "\033[?1;2c"
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#define VT102ID "\033[?6c"
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struct consw {
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struct module *owner;
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const char *(*con_startup)(void);
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void (*con_init)(struct vc_data *, int);
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void (*con_deinit)(struct vc_data *);
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void (*con_clear)(struct vc_data *, int, int, int, int);
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void (*con_putc)(struct vc_data *, int, int, int);
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void (*con_putcs)(struct vc_data *, const unsigned short *, int, int, int);
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void (*con_cursor)(struct vc_data *, int);
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int (*con_scroll)(struct vc_data *, int, int, int, int);
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void (*con_bmove)(struct vc_data *, int, int, int, int, int, int);
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int (*con_switch)(struct vc_data *);
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int (*con_blank)(struct vc_data *, int, int);
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int (*con_font_set)(struct vc_data *, struct console_font *, unsigned);
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int (*con_font_get)(struct vc_data *, struct console_font *);
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int (*con_font_default)(struct vc_data *, struct console_font *, char *);
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int (*con_font_copy)(struct vc_data *, int);
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int (*con_resize)(struct vc_data *, unsigned int, unsigned int,
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unsigned int);
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int (*con_set_palette)(struct vc_data *, unsigned char *);
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int (*con_scrolldelta)(struct vc_data *, int);
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int (*con_set_origin)(struct vc_data *);
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void (*con_save_screen)(struct vc_data *);
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u8 (*con_build_attr)(struct vc_data *, u8, u8, u8, u8, u8, u8);
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void (*con_invert_region)(struct vc_data *, u16 *, int);
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u16 *(*con_screen_pos)(struct vc_data *, int);
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unsigned long (*con_getxy)(struct vc_data *, unsigned long, int *, int *);
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/*
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* Prepare the console for the debugger. This includes, but is not
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* limited to, unblanking the console, loading an appropriate
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* palette, and allowing debugger generated output.
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*/
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int (*con_debug_enter)(struct vc_data *);
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/*
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* Restore the console to its pre-debug state as closely as possible.
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*/
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int (*con_debug_leave)(struct vc_data *);
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};
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extern const struct consw *conswitchp;
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extern const struct consw dummy_con; /* dummy console buffer */
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extern const struct consw vga_con; /* VGA text console */
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extern const struct consw newport_con; /* SGI Newport console */
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extern const struct consw prom_con; /* SPARC PROM console */
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int con_is_bound(const struct consw *csw);
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int register_con_driver(const struct consw *csw, int first, int last);
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int unregister_con_driver(const struct consw *csw);
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int take_over_console(const struct consw *sw, int first, int last, int deflt);
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void give_up_console(const struct consw *sw);
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#ifdef CONFIG_HW_CONSOLE
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int con_debug_enter(struct vc_data *vc);
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int con_debug_leave(void);
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#else
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static inline int con_debug_enter(struct vc_data *vc)
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{
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return 0;
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}
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static inline int con_debug_leave(void)
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{
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return 0;
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}
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#endif
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/* scroll */
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#define SM_UP (1)
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#define SM_DOWN (2)
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/* cursor */
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#define CM_DRAW (1)
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#define CM_ERASE (2)
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#define CM_MOVE (3)
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/*
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* The interface for a console, or any other device that wants to capture
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* console messages (printer driver?)
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*
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* If a console driver is marked CON_BOOT then it will be auto-unregistered
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* when the first real console is registered. This is for early-printk drivers.
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*/
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#define CON_PRINTBUFFER (1)
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#define CON_CONSDEV (2) /* Last on the command line */
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#define CON_ENABLED (4)
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#define CON_BOOT (8)
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#define CON_ANYTIME (16) /* Safe to call when cpu is offline */
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#define CON_BRL (32) /* Used for a braille device */
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struct console {
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char name[16];
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void (*write)(struct console *, const char *, unsigned);
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int (*read)(struct console *, char *, unsigned);
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struct tty_driver *(*device)(struct console *, int *);
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void (*unblank)(void);
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int (*setup)(struct console *, char *);
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int (*early_setup)(void);
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short flags;
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short index;
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int cflag;
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void *data;
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struct console *next;
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};
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/*
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* for_each_console() allows you to iterate on each console
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*/
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#define for_each_console(con) \
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for (con = console_drivers; con != NULL; con = con->next)
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extern int console_set_on_cmdline;
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extern int add_preferred_console(char *name, int idx, char *options);
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extern int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options);
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extern void register_console(struct console *);
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extern int unregister_console(struct console *);
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extern struct console *console_drivers;
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extern void console_lock(void);
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extern int console_trylock(void);
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extern void console_unlock(void);
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extern void console_conditional_schedule(void);
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extern void console_unblank(void);
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extern struct tty_driver *console_device(int *);
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extern void console_stop(struct console *);
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extern void console_start(struct console *);
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extern int is_console_locked(void);
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extern int braille_register_console(struct console *, int index,
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char *console_options, char *braille_options);
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extern int braille_unregister_console(struct console *);
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#ifdef CONFIG_TTY
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extern void console_sysfs_notify(void);
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#else
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static inline void console_sysfs_notify(void)
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{ }
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#endif
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extern bool console_suspend_enabled;
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/* Suspend and resume console messages over PM events */
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extern void suspend_console(void);
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extern void resume_console(void);
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int mda_console_init(void);
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void prom_con_init(void);
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void vcs_make_sysfs(int index);
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void vcs_remove_sysfs(int index);
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/* Some debug stub to catch some of the obvious races in the VT code */
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#if 1
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#define WARN_CONSOLE_UNLOCKED() WARN_ON(!is_console_locked() && !oops_in_progress)
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#else
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#define WARN_CONSOLE_UNLOCKED()
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#endif
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/* VESA Blanking Levels */
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#define VESA_NO_BLANKING 0
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#define VESA_VSYNC_SUSPEND 1
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#define VESA_HSYNC_SUSPEND 2
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#define VESA_POWERDOWN 3
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#ifdef CONFIG_VGA_CONSOLE
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extern bool vgacon_text_force(void);
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#endif
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#endif /* _LINUX_CONSOLE_H */
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