/* * linux/drivers/char/vt.c * * Copyright (C) 1991, 1992 Linus Torvalds */ /* * Hopefully this will be a rather complete VT102 implementation. * * Beeping thanks to John T Kohl. * * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics * Chars, and VT100 enhancements by Peter MacDonald. * * Copy and paste function by Andrew Haylett, * some enhancements by Alessandro Rubini. * * Code to check for different video-cards mostly by Galen Hunt, * * * Rudimentary ISO 10646/Unicode/UTF-8 character set support by * Markus Kuhn, . * * Dynamic allocation of consoles, aeb@cwi.nl, May 1994 * Resizing of consoles, aeb, 940926 * * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94 * * * User-defined bell sound, new setterm control sequences and printk * redirection by Martin Mares 19-Nov-95 * * APM screenblank bug fixed Takashi Manabe * * Merge with the abstract console driver by Geert Uytterhoeven * , Jan 1997. * * Original m68k console driver modifications by * * - Arno Griffioen * - David Carter * * The abstract console driver provides a generic interface for a text * console. It supports VGA text mode, frame buffer based graphical consoles * and special graphics processors that are only accessible through some * registers (e.g. a TMS340x0 GSP). * * The interface to the hardware is specified using a special structure * (struct consw) which contains function pointers to console operations * (see for more information). * * Support for changeable cursor shape * by Pavel Machek , August 1997 * * Ported to i386 and con_scrolldelta fixed * by Emmanuel Marty , April 1998 * * Resurrected character buffers in videoram plus lots of other trickery * by Martin Mares , July 1998 * * Removed old-style timers, introduced console_timer, made timer * deletion SMP-safe. 17Jun00, Andrew Morton * * Removed console_lock, enabled interrupts across all console operations * 13 March 2001, Andrew Morton * * Fixed UTF-8 mode so alternate charset modes always work according * to control sequences interpreted in do_con_trol function * preserving backward VT100 semigraphics compatibility, * malformed UTF sequences represented as sequences of replacement glyphs, * original codes or '?' as a last resort if replacement glyph is undefined * by Adam Tla/lka , Aug 2006 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MAX_NR_CON_DRIVER 16 #define CON_DRIVER_FLAG_MODULE 1 #define CON_DRIVER_FLAG_INIT 2 #define CON_DRIVER_FLAG_ATTR 4 struct con_driver { const struct consw *con; const char *desc; struct device *dev; int node; int first; int last; int flag; }; static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER]; const struct consw *conswitchp; /* A bitmap for codes <32. A bit of 1 indicates that the code * corresponding to that bit number invokes some special action * (such as cursor movement) and should not be displayed as a * glyph unless the disp_ctrl mode is explicitly enabled. */ #define CTRL_ACTION 0x0d00ff81 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */ /* * Here is the default bell parameters: 750HZ, 1/8th of a second */ #define DEFAULT_BELL_PITCH 750 #define DEFAULT_BELL_DURATION (HZ/8) struct vc vc_cons [MAX_NR_CONSOLES]; #ifndef VT_SINGLE_DRIVER static const struct consw *con_driver_map[MAX_NR_CONSOLES]; #endif static int con_open(struct tty_struct *, struct file *); static void vc_init(struct vc_data *vc, unsigned int rows, unsigned int cols, int do_clear); static void gotoxy(struct vc_data *vc, int new_x, int new_y); static void save_cur(struct vc_data *vc); static void reset_terminal(struct vc_data *vc, int do_clear); static void con_flush_chars(struct tty_struct *tty); static int set_vesa_blanking(char __user *p); static void set_cursor(struct vc_data *vc); static void hide_cursor(struct vc_data *vc); static void console_callback(struct work_struct *ignored); static void blank_screen_t(unsigned long dummy); static void set_palette(struct vc_data *vc); static int printable; /* Is console ready for printing? */ int default_utf8 = true; module_param(default_utf8, int, S_IRUGO | S_IWUSR); int global_cursor_default = -1; module_param(global_cursor_default, int, S_IRUGO | S_IWUSR); static int cur_default = CUR_DEFAULT; module_param(cur_default, int, S_IRUGO | S_IWUSR); /* * ignore_poke: don't unblank the screen when things are typed. This is * mainly for the privacy of braille terminal users. */ static int ignore_poke; int do_poke_blanked_console; int console_blanked; static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */ static int vesa_off_interval; static int blankinterval = 10*60; core_param(consoleblank, blankinterval, int, 0444); static DECLARE_WORK(console_work, console_callback); /* * fg_console is the current virtual console, * last_console is the last used one, * want_console is the console we want to switch to, * saved_* variants are for save/restore around kernel debugger enter/leave */ int fg_console; int last_console; int want_console = -1; static int saved_fg_console; static int saved_last_console; static int saved_want_console; static int saved_vc_mode; static int saved_console_blanked; /* * For each existing display, we have a pointer to console currently visible * on that display, allowing consoles other than fg_console to be refreshed * appropriately. Unless the low-level driver supplies its own display_fg * variable, we use this one for the "master display". */ static struct vc_data *master_display_fg; /* * Unfortunately, we need to delay tty echo when we're currently writing to the * console since the code is (and always was) not re-entrant, so we schedule * all flip requests to process context with schedule-task() and run it from * console_callback(). */ /* * For the same reason, we defer scrollback to the console callback. */ static int scrollback_delta; /* * Hook so that the power management routines can (un)blank * the console on our behalf. */ int (*console_blank_hook)(int); static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0); static int blank_state; static int blank_timer_expired; enum { blank_off = 0, blank_normal_wait, blank_vesa_wait, }; /* * Notifier list for console events. */ static ATOMIC_NOTIFIER_HEAD(vt_notifier_list); int register_vt_notifier(struct notifier_block *nb) { return atomic_notifier_chain_register(&vt_notifier_list, nb); } EXPORT_SYMBOL_GPL(register_vt_notifier); int unregister_vt_notifier(struct notifier_block *nb) { return atomic_notifier_chain_unregister(&vt_notifier_list, nb); } EXPORT_SYMBOL_GPL(unregister_vt_notifier); static void notify_write(struct vc_data *vc, unsigned int unicode) { struct vt_notifier_param param = { .vc = vc, unicode = unicode }; atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m); } static void notify_update(struct vc_data *vc) { struct vt_notifier_param param = { .vc = vc }; atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m); } /* * Low-Level Functions */ #define IS_FG(vc) ((vc)->vc_num == fg_console) #ifdef VT_BUF_VRAM_ONLY #define DO_UPDATE(vc) 0 #else #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked) #endif static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed) { unsigned short *p; if (!viewed) p = (unsigned short *)(vc->vc_origin + offset); else if (!vc->vc_sw->con_screen_pos) p = (unsigned short *)(vc->vc_visible_origin + offset); else p = vc->vc_sw->con_screen_pos(vc, offset); return p; } /* Called from the keyboard irq path.. */ static inline void scrolldelta(int lines) { /* FIXME */ /* scrolldelta needs some kind of consistency lock, but the BKL was and still is not protecting versus the scheduled back end */ scrollback_delta += lines; schedule_console_callback(); } void schedule_console_callback(void) { schedule_work(&console_work); } static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr) { unsigned short *d, *s; if (t+nr >= b) nr = b - t - 1; if (b > vc->vc_rows || t >= b || nr < 1) return; if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr)) return; d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t); s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr)); scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row); scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char, vc->vc_size_row * nr); } static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr) { unsigned short *s; unsigned int step; if (t+nr >= b) nr = b - t - 1; if (b > vc->vc_rows || t >= b || nr < 1) return; if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr)) return; s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t); step = vc->vc_cols * nr; scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row); scr_memsetw(s, vc->vc_video_erase_char, 2 * step); } static void do_update_region(struct vc_data *vc, unsigned long start, int count) { #ifndef VT_BUF_VRAM_ONLY unsigned int xx, yy, offset; u16 *p; p = (u16 *) start; if (!vc->vc_sw->con_getxy) { offset = (start - vc->vc_origin) / 2; xx = offset % vc->vc_cols; yy = offset / vc->vc_cols; } else { int nxx, nyy; start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy); xx = nxx; yy = nyy; } for(;;) { u16 attrib = scr_readw(p) & 0xff00; int startx = xx; u16 *q = p; while (xx < vc->vc_cols && count) { if (attrib != (scr_readw(p) & 0xff00)) { if (p > q) vc->vc_sw->con_putcs(vc, q, p-q, yy, startx); startx = xx; q = p; attrib = scr_readw(p) & 0xff00; } p++; xx++; count--; } if (p > q) vc->vc_sw->con_putcs(vc, q, p-q, yy, startx); if (!count) break; xx = 0; yy++; if (vc->vc_sw->con_getxy) { p = (u16 *)start; start = vc->vc_sw->con_getxy(vc, start, NULL, NULL); } } #endif } void update_region(struct vc_data *vc, unsigned long start, int count) { WARN_CONSOLE_UNLOCKED(); if (DO_UPDATE(vc)) { hide_cursor(vc); do_update_region(vc, start, count); set_cursor(vc); } } /* Structure of attributes is hardware-dependent */ static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse, u8 _italic) { if (vc->vc_sw->con_build_attr) return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse, _italic); #ifndef VT_BUF_VRAM_ONLY /* * ++roman: I completely changed the attribute format for monochrome * mode (!can_do_color). The formerly used MDA (monochrome display * adapter) format didn't allow the combination of certain effects. * Now the attribute is just a bit vector: * Bit 0..1: intensity (0..2) * Bit 2 : underline * Bit 3 : reverse * Bit 7 : blink */ { u8 a = _color; if (!vc->vc_can_do_color) return _intensity | (_italic ? 2 : 0) | (_underline ? 4 : 0) | (_reverse ? 8 : 0) | (_blink ? 0x80 : 0); if (_italic) a = (a & 0xF0) | vc->vc_itcolor; else if (_underline) a = (a & 0xf0) | vc->vc_ulcolor; else if (_intensity == 0) a = (a & 0xf0) | vc->vc_ulcolor; if (_reverse) a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77); if (_blink) a ^= 0x80; if (_intensity == 2) a ^= 0x08; if (vc->vc_hi_font_mask == 0x100) a <<= 1; return a; } #else return 0; #endif } static void update_attr(struct vc_data *vc) { vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic); vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' '; } /* Note: inverting the screen twice should revert to the original state */ void invert_screen(struct vc_data *vc, int offset, int count, int viewed) { unsigned short *p; WARN_CONSOLE_UNLOCKED(); count /= 2; p = screenpos(vc, offset, viewed); if (vc->vc_sw->con_invert_region) vc->vc_sw->con_invert_region(vc, p, count); #ifndef VT_BUF_VRAM_ONLY else { u16 *q = p; int cnt = count; u16 a; if (!vc->vc_can_do_color) { while (cnt--) { a = scr_readw(q); a ^= 0x0800; scr_writew(a, q); q++; } } else if (vc->vc_hi_font_mask == 0x100) { while (cnt--) { a = scr_readw(q); a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4); scr_writew(a, q); q++; } } else { while (cnt--) { a = scr_readw(q); a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4); scr_writew(a, q); q++; } } } #endif if (DO_UPDATE(vc)) do_update_region(vc, (unsigned long) p, count); } /* used by selection: complement pointer position */ void complement_pos(struct vc_data *vc, int offset) { static int old_offset = -1; static unsigned short old; static unsigned short oldx, oldy; WARN_CONSOLE_UNLOCKED(); if (old_offset != -1 && old_offset >= 0 && old_offset < vc->vc_screenbuf_size) { scr_writew(old, screenpos(vc, old_offset, 1)); if (DO_UPDATE(vc)) vc->vc_sw->con_putc(vc, old, oldy, oldx); } old_offset = offset; if (offset != -1 && offset >= 0 && offset < vc->vc_screenbuf_size) { unsigned short new; unsigned short *p; p = screenpos(vc, offset, 1); old = scr_readw(p); new = old ^ vc->vc_complement_mask; scr_writew(new, p); if (DO_UPDATE(vc)) { oldx = (offset >> 1) % vc->vc_cols; oldy = (offset >> 1) / vc->vc_cols; vc->vc_sw->con_putc(vc, new, oldy, oldx); } } } static void insert_char(struct vc_data *vc, unsigned int nr) { unsigned short *p, *q = (unsigned short *)vc->vc_pos; p = q + vc->vc_cols - nr - vc->vc_x; while (--p >= q) scr_writew(scr_readw(p), p + nr); scr_memsetw(q, vc->vc_video_erase_char, nr * 2); vc->vc_need_wrap = 0; if (DO_UPDATE(vc)) { unsigned short oldattr = vc->vc_attr; vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1, vc->vc_cols - vc->vc_x - nr); vc->vc_attr = vc->vc_video_erase_char >> 8; while (nr--) vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr); vc->vc_attr = oldattr; } } static void delete_char(struct vc_data *vc, unsigned int nr) { unsigned int i = vc->vc_x; unsigned short *p = (unsigned short *)vc->vc_pos; while (++i <= vc->vc_cols - nr) { scr_writew(scr_readw(p+nr), p); p++; } scr_memsetw(p, vc->vc_video_erase_char, nr * 2); vc->vc_need_wrap = 0; if (DO_UPDATE(vc)) { unsigned short oldattr = vc->vc_attr; vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1, vc->vc_cols - vc->vc_x - nr); vc->vc_attr = vc->vc_video_erase_char >> 8; while (nr--) vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_cols - 1 - nr); vc->vc_attr = oldattr; } } static int softcursor_original; static void add_softcursor(struct vc_data *vc) { int i = scr_readw((u16 *) vc->vc_pos); u32 type = vc->vc_cursor_type; if (! (type & 0x10)) return; if (softcursor_original != -1) return; softcursor_original = i; i |= ((type >> 8) & 0xff00 ); i ^= ((type) & 0xff00 ); if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000; if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700; scr_writew(i, (u16 *) vc->vc_pos); if (DO_UPDATE(vc)) vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x); } static void hide_softcursor(struct vc_data *vc) { if (softcursor_original != -1) { scr_writew(softcursor_original, (u16 *)vc->vc_pos); if (DO_UPDATE(vc)) vc->vc_sw->con_putc(vc, softcursor_original, vc->vc_y, vc->vc_x); softcursor_original = -1; } } static void hide_cursor(struct vc_data *vc) { if (vc == sel_cons) clear_selection(); vc->vc_sw->con_cursor(vc, CM_ERASE); hide_softcursor(vc); } static void set_cursor(struct vc_data *vc) { if (!IS_FG(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS) return; if (vc->vc_deccm) { if (vc == sel_cons) clear_selection(); add_softcursor(vc); if ((vc->vc_cursor_type & 0x0f) != 1) vc->vc_sw->con_cursor(vc, CM_DRAW); } else hide_cursor(vc); } static void set_origin(struct vc_data *vc) { WARN_CONSOLE_UNLOCKED(); if (!CON_IS_VISIBLE(vc) || !vc->vc_sw->con_set_origin || !vc->vc_sw->con_set_origin(vc)) vc->vc_origin = (unsigned long)vc->vc_screenbuf; vc->vc_visible_origin = vc->vc_origin; vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size; vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x; } static inline void save_screen(struct vc_data *vc) { WARN_CONSOLE_UNLOCKED(); if (vc->vc_sw->con_save_screen) vc->vc_sw->con_save_screen(vc); } /* * Redrawing of screen */ static void clear_buffer_attributes(struct vc_data *vc) { unsigned short *p = (unsigned short *)vc->vc_origin; int count = vc->vc_screenbuf_size / 2; int mask = vc->vc_hi_font_mask | 0xff; for (; count > 0; count--, p++) { scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p); } } void redraw_screen(struct vc_data *vc, int is_switch) { int redraw = 0; WARN_CONSOLE_UNLOCKED(); if (!vc) { /* strange ... */ /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */ return; } if (is_switch) { struct vc_data *old_vc = vc_cons[fg_console].d; if (old_vc == vc) return; if (!CON_IS_VISIBLE(vc)) redraw = 1; *vc->vc_display_fg = vc; fg_console = vc->vc_num; hide_cursor(old_vc); if (!CON_IS_VISIBLE(old_vc)) { save_screen(old_vc); set_origin(old_vc); } } else { hide_cursor(vc); redraw = 1; } if (redraw) { int update; int old_was_color = vc->vc_can_do_color; set_origin(vc); update = vc->vc_sw->con_switch(vc); set_palette(vc); /* * If console changed from mono<->color, the best we can do * is to clear the buffer attributes. As it currently stands, * rebuilding new attributes from the old buffer is not doable * without overly complex code. */ if (old_was_color != vc->vc_can_do_color) { update_attr(vc); clear_buffer_attributes(vc); } /* Forcibly update if we're panicing */ if ((update && vc->vc_mode != KD_GRAPHICS) || vt_force_oops_output(vc)) do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2); } set_cursor(vc); if (is_switch) { set_leds(); compute_shiftstate(); notify_update(vc); } } /* * Allocation, freeing and resizing of VTs. */ int vc_cons_allocated(unsigned int i) { return (i < MAX_NR_CONSOLES && vc_cons[i].d); } static void visual_init(struct vc_data *vc, int num, int init) { /* ++Geert: vc->vc_sw->con_init determines console size */ if (vc->vc_sw) module_put(vc->vc_sw->owner); vc->vc_sw = conswitchp; #ifndef VT_SINGLE_DRIVER if (con_driver_map[num]) vc->vc_sw = con_driver_map[num]; #endif __module_get(vc->vc_sw->owner); vc->vc_num = num; vc->vc_display_fg = &master_display_fg; vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir; vc->vc_uni_pagedir = 0; vc->vc_hi_font_mask = 0; vc->vc_complement_mask = 0; vc->vc_can_do_color = 0; vc->vc_panic_force_write = false; vc->vc_sw->con_init(vc, init); if (!vc->vc_complement_mask) vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800; vc->vc_s_complement_mask = vc->vc_complement_mask; vc->vc_size_row = vc->vc_cols << 1; vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row; } int vc_allocate(unsigned int currcons) /* return 0 on success */ { WARN_CONSOLE_UNLOCKED(); if (currcons >= MAX_NR_CONSOLES) return -ENXIO; if (!vc_cons[currcons].d) { struct vc_data *vc; struct vt_notifier_param param; /* prevent users from taking too much memory */ if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE)) return -EPERM; /* due to the granularity of kmalloc, we waste some memory here */ /* the alloc is done in two steps, to optimize the common situation of a 25x80 console (structsize=216, screenbuf_size=4000) */ /* although the numbers above are not valid since long ago, the point is still up-to-date and the comment still has its value even if only as a historical artifact. --mj, July 1998 */ param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL); if (!vc) return -ENOMEM; vc_cons[currcons].d = vc; tty_port_init(&vc->port); INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK); visual_init(vc, currcons, 1); if (!*vc->vc_uni_pagedir_loc) con_set_default_unimap(vc); vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL); if (!vc->vc_screenbuf) { kfree(vc); vc_cons[currcons].d = NULL; return -ENOMEM; } /* If no drivers have overridden us and the user didn't pass a boot option, default to displaying the cursor */ if (global_cursor_default == -1) global_cursor_default = 1; vc_init(vc, vc->vc_rows, vc->vc_cols, 1); vcs_make_sysfs(currcons); atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m); } return 0; } static inline int resize_screen(struct vc_data *vc, int width, int height, int user) { /* Resizes the resolution of the display adapater */ int err = 0; if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize) err = vc->vc_sw->con_resize(vc, width, height, user); return err; } /* * Change # of rows and columns (0 means unchanged/the size of fg_console) * [this is to be used together with some user program * like resize that changes the hardware videomode] */ #define VC_RESIZE_MAXCOL (32767) #define VC_RESIZE_MAXROW (32767) /** * vc_do_resize - resizing method for the tty * @tty: tty being resized * @real_tty: real tty (different to tty if a pty/tty pair) * @vc: virtual console private data * @cols: columns * @lines: lines * * Resize a virtual console, clipping according to the actual constraints. * If the caller passes a tty structure then update the termios winsize * information and perform any necessary signal handling. * * Caller must hold the console semaphore. Takes the termios mutex and * ctrl_lock of the tty IFF a tty is passed. */ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc, unsigned int cols, unsigned int lines) { unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0; unsigned long end; unsigned int old_cols, old_rows, old_row_size, old_screen_size; unsigned int new_cols, new_rows, new_row_size, new_screen_size; unsigned int user; unsigned short *newscreen; WARN_CONSOLE_UNLOCKED(); if (!vc) return -ENXIO; user = vc->vc_resize_user; vc->vc_resize_user = 0; if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW) return -EINVAL; new_cols = (cols ? cols : vc->vc_cols); new_rows = (lines ? lines : vc->vc_rows); new_row_size = new_cols << 1; new_screen_size = new_row_size * new_rows; if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) return 0; newscreen = kmalloc(new_screen_size, GFP_USER); if (!newscreen) return -ENOMEM; old_rows = vc->vc_rows; old_cols = vc->vc_cols; old_row_size = vc->vc_size_row; old_screen_size = vc->vc_screenbuf_size; err = resize_screen(vc, new_cols, new_rows, user); if (err) { kfree(newscreen); return err; } vc->vc_rows = new_rows; vc->vc_cols = new_cols; vc->vc_size_row = new_row_size; vc->vc_screenbuf_size = new_screen_size; rlth = min(old_row_size, new_row_size); rrem = new_row_size - rlth; old_origin = vc->vc_origin; new_origin = (long) newscreen; new_scr_end = new_origin + new_screen_size; if (vc->vc_y > new_rows) { if (old_rows - vc->vc_y < new_rows) { /* * Cursor near the bottom, copy contents from the * bottom of buffer */ old_origin += (old_rows - new_rows) * old_row_size; } else { /* * Cursor is in no man's land, copy 1/2 screenful * from the top and bottom of cursor position */ old_origin += (vc->vc_y - new_rows/2) * old_row_size; } } end = old_origin + old_row_size * min(old_rows, new_rows); update_attr(vc); while (old_origin < end) { scr_memcpyw((unsigned short *) new_origin, (unsigned short *) old_origin, rlth); if (rrem) scr_memsetw((void *)(new_origin + rlth), vc->vc_video_erase_char, rrem); old_origin += old_row_size; new_origin += new_row_size; } if (new_scr_end > new_origin) scr_memsetw((void *)new_origin, vc->vc_video_erase_char, new_scr_end - new_origin); kfree(vc->vc_screenbuf); vc->vc_screenbuf = newscreen; vc->vc_screenbuf_size = new_screen_size; set_origin(vc); /* do part of a reset_terminal() */ vc->vc_top = 0; vc->vc_bottom = vc->vc_rows; gotoxy(vc, vc->vc_x, vc->vc_y); save_cur(vc); if (tty) { /* Rewrite the requested winsize data with the actual resulting sizes */ struct winsize ws; memset(&ws, 0, sizeof(ws)); ws.ws_row = vc->vc_rows; ws.ws_col = vc->vc_cols; ws.ws_ypixel = vc->vc_scan_lines; tty_do_resize(tty, &ws); } if (CON_IS_VISIBLE(vc)) update_screen(vc); vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num); return err; } /** * vc_resize - resize a VT * @vc: virtual console * @cols: columns * @rows: rows * * Resize a virtual console as seen from the console end of things. We * use the common vc_do_resize methods to update the structures. The * caller must hold the console sem to protect console internals and * vc->port.tty */ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows) { return vc_do_resize(vc->port.tty, vc, cols, rows); } /** * vt_resize - resize a VT * @tty: tty to resize * @ws: winsize attributes * * Resize a virtual terminal. This is called by the tty layer as we * register our own handler for resizing. The mutual helper does all * the actual work. * * Takes the console sem and the called methods then take the tty * termios_mutex and the tty ctrl_lock in that order. */ static int vt_resize(struct tty_struct *tty, struct winsize *ws) { struct vc_data *vc = tty->driver_data; int ret; acquire_console_sem(); ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row); release_console_sem(); return ret; } void vc_deallocate(unsigned int currcons) { WARN_CONSOLE_UNLOCKED(); if (vc_cons_allocated(currcons)) { struct vc_data *vc = vc_cons[currcons].d; struct vt_notifier_param param = { .vc = vc }; atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m); vcs_remove_sysfs(currcons); vc->vc_sw->con_deinit(vc); put_pid(vc->vt_pid); module_put(vc->vc_sw->owner); kfree(vc->vc_screenbuf); if (currcons >= MIN_NR_CONSOLES) kfree(vc); vc_cons[currcons].d = NULL; } } /* * VT102 emulator */ #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x)) #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x)) #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x)) #define decarm VC_REPEAT #define decckm VC_CKMODE #define kbdapplic VC_APPLIC #define lnm VC_CRLF /* * this is what the terminal answers to a ESC-Z or csi0c query. */ #define VT100ID "\033[?1;2c" #define VT102ID "\033[?6c" unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7, 8,12,10,14, 9,13,11,15 }; /* the default colour table, for VGA+ colour systems */ int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa, 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff}; int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa, 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff}; int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa, 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff}; module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR); module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR); module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR); /* * gotoxy() must verify all boundaries, because the arguments * might also be negative. If the given position is out of * bounds, the cursor is placed at the nearest margin. */ static void gotoxy(struct vc_data *vc, int new_x, int new_y) { int min_y, max_y; if (new_x < 0) vc->vc_x = 0; else { if (new_x >= vc->vc_cols) vc->vc_x = vc->vc_cols - 1; else vc->vc_x = new_x; } if (vc->vc_decom) { min_y = vc->vc_top; max_y = vc->vc_bottom; } else { min_y = 0; max_y = vc->vc_rows; } if (new_y < min_y) vc->vc_y = min_y; else if (new_y >= max_y) vc->vc_y = max_y - 1; else vc->vc_y = new_y; vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1); vc->vc_need_wrap = 0; } /* for absolute user moves, when decom is set */ static void gotoxay(struct vc_data *vc, int new_x, int new_y) { gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y); } void scrollback(struct vc_data *vc, int lines) { if (!lines) lines = vc->vc_rows / 2; scrolldelta(-lines); } void scrollfront(struct vc_data *vc, int lines) { if (!lines) lines = vc->vc_rows / 2; scrolldelta(lines); } static void lf(struct vc_data *vc) { /* don't scroll if above bottom of scrolling region, or * if below scrolling region */ if (vc->vc_y + 1 == vc->vc_bottom) scrup(vc, vc->vc_top, vc->vc_bottom, 1); else if (vc->vc_y < vc->vc_rows - 1) { vc->vc_y++; vc->vc_pos += vc->vc_size_row; } vc->vc_need_wrap = 0; notify_write(vc, '\n'); } static void ri(struct vc_data *vc) { /* don't scroll if below top of scrolling region, or * if above scrolling region */ if (vc->vc_y == vc->vc_top) scrdown(vc, vc->vc_top, vc->vc_bottom, 1); else if (vc->vc_y > 0) { vc->vc_y--; vc->vc_pos -= vc->vc_size_row; } vc->vc_need_wrap = 0; } static inline void cr(struct vc_data *vc) { vc->vc_pos -= vc->vc_x << 1; vc->vc_need_wrap = vc->vc_x = 0; notify_write(vc, '\r'); } static inline void bs(struct vc_data *vc) { if (vc->vc_x) { vc->vc_pos -= 2; vc->vc_x--; vc->vc_need_wrap = 0; notify_write(vc, '\b'); } } static inline void del(struct vc_data *vc) { /* ignored */ } static void csi_J(struct vc_data *vc, int vpar) { unsigned int count; unsigned short * start; switch (vpar) { case 0: /* erase from cursor to end of display */ count = (vc->vc_scr_end - vc->vc_pos) >> 1; start = (unsigned short *)vc->vc_pos; if (DO_UPDATE(vc)) { /* do in two stages */ vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, vc->vc_cols - vc->vc_x); vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0, vc->vc_rows - vc->vc_y - 1, vc->vc_cols); } break; case 1: /* erase from start to cursor */ count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1; start = (unsigned short *)vc->vc_origin; if (DO_UPDATE(vc)) { /* do in two stages */ vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y, vc->vc_cols); vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1, vc->vc_x + 1); } break; case 2: /* erase whole display */ count = vc->vc_cols * vc->vc_rows; start = (unsigned short *)vc->vc_origin; if (DO_UPDATE(vc)) vc->vc_sw->con_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols); break; default: return; } scr_memsetw(start, vc->vc_video_erase_char, 2 * count); vc->vc_need_wrap = 0; } static void csi_K(struct vc_data *vc, int vpar) { unsigned int count; unsigned short * start; switch (vpar) { case 0: /* erase from cursor to end of line */ count = vc->vc_cols - vc->vc_x; start = (unsigned short *)vc->vc_pos; if (DO_UPDATE(vc)) vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, vc->vc_cols - vc->vc_x); break; case 1: /* erase from start of line to cursor */ start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1)); count = vc->vc_x + 1; if (DO_UPDATE(vc)) vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1, vc->vc_x + 1); break; case 2: /* erase whole line */ start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1)); count = vc->vc_cols; if (DO_UPDATE(vc)) vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1, vc->vc_cols); break; default: return; } scr_memsetw(start, vc->vc_video_erase_char, 2 * count); vc->vc_need_wrap = 0; } static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */ { /* not vt100? */ int count; if (!vpar) vpar++; count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar; scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count); if (DO_UPDATE(vc)) vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count); vc->vc_need_wrap = 0; } static void default_attr(struct vc_data *vc) { vc->vc_intensity = 1; vc->vc_italic = 0; vc->vc_underline = 0; vc->vc_reverse = 0; vc->vc_blink = 0; vc->vc_color = vc->vc_def_color; } /* console_sem is held */ static void csi_m(struct vc_data *vc) { int i; for (i = 0; i <= vc->vc_npar; i++) switch (vc->vc_par[i]) { case 0: /* all attributes off */ default_attr(vc); break; case 1: vc->vc_intensity = 2; break; case 2: vc->vc_intensity = 0; break; case 3: vc->vc_italic = 1; break; case 4: vc->vc_underline = 1; break; case 5: vc->vc_blink = 1; break; case 7: vc->vc_reverse = 1; break; case 10: /* ANSI X3.64-1979 (SCO-ish?) * Select primary font, don't display * control chars if defined, don't set * bit 8 on output. */ vc->vc_translate = set_translate(vc->vc_charset == 0 ? vc->vc_G0_charset : vc->vc_G1_charset, vc); vc->vc_disp_ctrl = 0; vc->vc_toggle_meta = 0; break; case 11: /* ANSI X3.64-1979 (SCO-ish?) * Select first alternate font, lets * chars < 32 be displayed as ROM chars. */ vc->vc_translate = set_translate(IBMPC_MAP, vc); vc->vc_disp_ctrl = 1; vc->vc_toggle_meta = 0; break; case 12: /* ANSI X3.64-1979 (SCO-ish?) * Select second alternate font, toggle * high bit before displaying as ROM char. */ vc->vc_translate = set_translate(IBMPC_MAP, vc); vc->vc_disp_ctrl = 1; vc->vc_toggle_meta = 1; break; case 21: case 22: vc->vc_intensity = 1; break; case 23: vc->vc_italic = 0; break; case 24: vc->vc_underline = 0; break; case 25: vc->vc_blink = 0; break; case 27: vc->vc_reverse = 0; break; case 38: /* ANSI X3.64-1979 (SCO-ish?) * Enables underscore, white foreground * with white underscore (Linux - use * default foreground). */ vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0); vc->vc_underline = 1; break; case 39: /* ANSI X3.64-1979 (SCO-ish?) * Disable underline option. * Reset colour to default? It did this * before... */ vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0); vc->vc_underline = 0; break; case 49: vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f); break; default: if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37) vc->vc_color = color_table[vc->vc_par[i] - 30] | (vc->vc_color & 0xf0); else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47) vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4) | (vc->vc_color & 0x0f); break; } update_attr(vc); } static void respond_string(const char *p, struct tty_struct *tty) { while (*p) { tty_insert_flip_char(tty, *p, 0); p++; } con_schedule_flip(tty); } static void cursor_report(struct vc_data *vc, struct tty_struct *tty) { char buf[40]; sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1); respond_string(buf, tty); } static inline void status_report(struct tty_struct *tty) { respond_string("\033[0n", tty); /* Terminal ok */ } static inline void respond_ID(struct tty_struct * tty) { respond_string(VT102ID, tty); } void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry) { char buf[8]; sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx), (char)('!' + mry)); respond_string(buf, tty); } /* invoked via ioctl(TIOCLINUX) and through set_selection */ int mouse_reporting(void) { return vc_cons[fg_console].d->vc_report_mouse; } /* console_sem is held */ static void set_mode(struct vc_data *vc, int on_off) { int i; for (i = 0; i <= vc->vc_npar; i++) if (vc->vc_ques) { switch(vc->vc_par[i]) { /* DEC private modes set/reset */ case 1: /* Cursor keys send ^[Ox/^[[x */ if (on_off) set_kbd(vc, decckm); else clr_kbd(vc, decckm); break; case 3: /* 80/132 mode switch unimplemented */ vc->vc_deccolm = on_off; #if 0 vc_resize(deccolm ? 132 : 80, vc->vc_rows); /* this alone does not suffice; some user mode utility has to change the hardware regs */ #endif break; case 5: /* Inverted screen on/off */ if (vc->vc_decscnm != on_off) { vc->vc_decscnm = on_off; invert_screen(vc, 0, vc->vc_screenbuf_size, 0); update_attr(vc); } break; case 6: /* Origin relative/absolute */ vc->vc_decom = on_off; gotoxay(vc, 0, 0); break; case 7: /* Autowrap on/off */ vc->vc_decawm = on_off; break; case 8: /* Autorepeat on/off */ if (on_off) set_kbd(vc, decarm); else clr_kbd(vc, decarm); break; case 9: vc->vc_report_mouse = on_off ? 1 : 0; break; case 25: /* Cursor on/off */ vc->vc_deccm = on_off; break; case 1000: vc->vc_report_mouse = on_off ? 2 : 0; break; } } else { switch(vc->vc_par[i]) { /* ANSI modes set/reset */ case 3: /* Monitor (display ctrls) */ vc->vc_disp_ctrl = on_off; break; case 4: /* Insert Mode on/off */ vc->vc_decim = on_off; break; case 20: /* Lf, Enter == CrLf/Lf */ if (on_off) set_kbd(vc, lnm); else clr_kbd(vc, lnm); break; } } } /* console_sem is held */ static void setterm_command(struct vc_data *vc) { switch(vc->vc_par[0]) { case 1: /* set color for underline mode */ if (vc->vc_can_do_color && vc->vc_par[1] < 16) { vc->vc_ulcolor = color_table[vc->vc_par[1]]; if (vc->vc_underline) update_attr(vc); } break; case 2: /* set color for half intensity mode */ if (vc->vc_can_do_color && vc->vc_par[1] < 16) { vc->vc_halfcolor = color_table[vc->vc_par[1]]; if (vc->vc_intensity == 0) update_attr(vc); } break; case 8: /* store colors as defaults */ vc->vc_def_color = vc->vc_attr; if (vc->vc_hi_font_mask == 0x100) vc->vc_def_color >>= 1; default_attr(vc); update_attr(vc); break; case 9: /* set blanking interval */ blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60; poke_blanked_console(); break; case 10: /* set bell frequency in Hz */ if (vc->vc_npar >= 1) vc->vc_bell_pitch = vc->vc_par[1]; else vc->vc_bell_pitch = DEFAULT_BELL_PITCH; break; case 11: /* set bell duration in msec */ if (vc->vc_npar >= 1) vc->vc_bell_duration = (vc->vc_par[1] < 2000) ? vc->vc_par[1] * HZ / 1000 : 0; else vc->vc_bell_duration = DEFAULT_BELL_DURATION; break; case 12: /* bring specified console to the front */ if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1)) set_console(vc->vc_par[1] - 1); break; case 13: /* unblank the screen */ poke_blanked_console(); break; case 14: /* set vesa powerdown interval */ vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ; break; case 15: /* activate the previous console */ set_console(last_console); break; } } /* console_sem is held */ static void csi_at(struct vc_data *vc, unsigned int nr) { if (nr > vc->vc_cols - vc->vc_x) nr = vc->vc_cols - vc->vc_x; else if (!nr) nr = 1; insert_char(vc, nr); } /* console_sem is held */ static void csi_L(struct vc_data *vc, unsigned int nr) { if (nr > vc->vc_rows - vc->vc_y) nr = vc->vc_rows - vc->vc_y; else if (!nr) nr = 1; scrdown(vc, vc->vc_y, vc->vc_bottom, nr); vc->vc_need_wrap = 0; } /* console_sem is held */ static void csi_P(struct vc_data *vc, unsigned int nr) { if (nr > vc->vc_cols - vc->vc_x) nr = vc->vc_cols - vc->vc_x; else if (!nr) nr = 1; delete_char(vc, nr); } /* console_sem is held */ static void csi_M(struct vc_data *vc, unsigned int nr) { if (nr > vc->vc_rows - vc->vc_y) nr = vc->vc_rows - vc->vc_y; else if (!nr) nr=1; scrup(vc, vc->vc_y, vc->vc_bottom, nr); vc->vc_need_wrap = 0; } /* console_sem is held (except via vc_init->reset_terminal */ static void save_cur(struct vc_data *vc) { vc->vc_saved_x = vc->vc_x; vc->vc_saved_y = vc->vc_y; vc->vc_s_intensity = vc->vc_intensity; vc->vc_s_italic = vc->vc_italic; vc->vc_s_underline = vc->vc_underline; vc->vc_s_blink = vc->vc_blink; vc->vc_s_reverse = vc->vc_reverse; vc->vc_s_charset = vc->vc_charset; vc->vc_s_color = vc->vc_color; vc->vc_saved_G0 = vc->vc_G0_charset; vc->vc_saved_G1 = vc->vc_G1_charset; } /* console_sem is held */ static void restore_cur(struct vc_data *vc) { gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y); vc->vc_intensity = vc->vc_s_intensity; vc->vc_italic = vc->vc_s_italic; vc->vc_underline = vc->vc_s_underline; vc->vc_blink = vc->vc_s_blink; vc->vc_reverse = vc->vc_s_reverse; vc->vc_charset = vc->vc_s_charset; vc->vc_color = vc->vc_s_color; vc->vc_G0_charset = vc->vc_saved_G0; vc->vc_G1_charset = vc->vc_saved_G1; vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc); update_attr(vc); vc->vc_need_wrap = 0; } enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey, EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd, ESpalette }; /* console_sem is held (except via vc_init()) */ static void reset_terminal(struct vc_data *vc, int do_clear) { vc->vc_top = 0; vc->vc_bottom = vc->vc_rows; vc->vc_state = ESnormal; vc->vc_ques = 0; vc->vc_translate = set_translate(LAT1_MAP, vc); vc->vc_G0_charset = LAT1_MAP; vc->vc_G1_charset = GRAF_MAP; vc->vc_charset = 0; vc->vc_need_wrap = 0; vc->vc_report_mouse = 0; vc->vc_utf = default_utf8; vc->vc_utf_count = 0; vc->vc_disp_ctrl = 0; vc->vc_toggle_meta = 0; vc->vc_decscnm = 0; vc->vc_decom = 0; vc->vc_decawm = 1; vc->vc_deccm = global_cursor_default; vc->vc_decim = 0; set_kbd(vc, decarm); clr_kbd(vc, decckm); clr_kbd(vc, kbdapplic); clr_kbd(vc, lnm); kbd_table[vc->vc_num].lockstate = 0; kbd_table[vc->vc_num].slockstate = 0; kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS; kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate; /* do not do set_leds here because this causes an endless tasklet loop when the keyboard hasn't been initialized yet */ vc->vc_cursor_type = cur_default; vc->vc_complement_mask = vc->vc_s_complement_mask; default_attr(vc); update_attr(vc); vc->vc_tab_stop[0] = 0x01010100; vc->vc_tab_stop[1] = vc->vc_tab_stop[2] = vc->vc_tab_stop[3] = vc->vc_tab_stop[4] = vc->vc_tab_stop[5] = vc->vc_tab_stop[6] = vc->vc_tab_stop[7] = 0x01010101; vc->vc_bell_pitch = DEFAULT_BELL_PITCH; vc->vc_bell_duration = DEFAULT_BELL_DURATION; gotoxy(vc, 0, 0); save_cur(vc); if (do_clear) csi_J(vc, 2); } /* console_sem is held */ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c) { /* * Control characters can be used in the _middle_ * of an escape sequence. */ switch (c) { case 0: return; case 7: if (vc->vc_bell_duration) kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration); return; case 8: bs(vc); return; case 9: vc->vc_pos -= (vc->vc_x << 1); while (vc->vc_x < vc->vc_cols - 1) { vc->vc_x++; if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31))) break; } vc->vc_pos += (vc->vc_x << 1); notify_write(vc, '\t'); return; case 10: case 11: case 12: lf(vc); if (!is_kbd(vc, lnm)) return; case 13: cr(vc); return; case 14: vc->vc_charset = 1; vc->vc_translate = set_translate(vc->vc_G1_charset, vc); vc->vc_disp_ctrl = 1; return; case 15: vc->vc_charset = 0; vc->vc_translate = set_translate(vc->vc_G0_charset, vc); vc->vc_disp_ctrl = 0; return; case 24: case 26: vc->vc_state = ESnormal; return; case 27: vc->vc_state = ESesc; return; case 127: del(vc); return; case 128+27: vc->vc_state = ESsquare; return; } switch(vc->vc_state) { case ESesc: vc->vc_state = ESnormal; switch (c) { case '[': vc->vc_state = ESsquare; return; case ']': vc->vc_state = ESnonstd; return; case '%': vc->vc_state = ESpercent; return; case 'E': cr(vc); lf(vc); return; case 'M': ri(vc); return; case 'D': lf(vc); return; case 'H': vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31)); return; case 'Z': respond_ID(tty); return; case '7': save_cur(vc); return; case '8': restore_cur(vc); return; case '(': vc->vc_state = ESsetG0; return; case ')': vc->vc_state = ESsetG1; return; case '#': vc->vc_state = EShash; return; case 'c': reset_terminal(vc, 1); return; case '>': /* Numeric keypad */ clr_kbd(vc, kbdapplic); return; case '=': /* Appl. keypad */ set_kbd(vc, kbdapplic); return; } return; case ESnonstd: if (c=='P') { /* palette escape sequence */ for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++) vc->vc_par[vc->vc_npar] = 0; vc->vc_npar = 0; vc->vc_state = ESpalette; return; } else if (c=='R') { /* reset palette */ reset_palette(vc); vc->vc_state = ESnormal; } else vc->vc_state = ESnormal; return; case ESpalette: if (isxdigit(c)) { vc->vc_par[vc->vc_npar++] = hex_to_bin(c); if (vc->vc_npar == 7) { int i = vc->vc_par[0] * 3, j = 1; vc->vc_palette[i] = 16 * vc->vc_par[j++]; vc->vc_palette[i++] += vc->vc_par[j++]; vc->vc_palette[i] = 16 * vc->vc_par[j++]; vc->vc_palette[i++] += vc->vc_par[j++]; vc->vc_palette[i] = 16 * vc->vc_par[j++]; vc->vc_palette[i] += vc->vc_par[j]; set_palette(vc); vc->vc_state = ESnormal; } } else vc->vc_state = ESnormal; return; case ESsquare: for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++) vc->vc_par[vc->vc_npar] = 0; vc->vc_npar = 0; vc->vc_state = ESgetpars; if (c == '[') { /* Function key */ vc->vc_state=ESfunckey; return; } vc->vc_ques = (c == '?'); if (vc->vc_ques) return; case ESgetpars: if (c == ';' && vc->vc_npar < NPAR - 1) { vc->vc_npar++; return; } else if (c>='0' && c<='9') { vc->vc_par[vc->vc_npar] *= 10; vc->vc_par[vc->vc_npar] += c - '0'; return; } else vc->vc_state = ESgotpars; case ESgotpars: vc->vc_state = ESnormal; switch(c) { case 'h': set_mode(vc, 1); return; case 'l': set_mode(vc, 0); return; case 'c': if (vc->vc_ques) { if (vc->vc_par[0]) vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16); else vc->vc_cursor_type = cur_default; return; } break; case 'm': if (vc->vc_ques) { clear_selection(); if (vc->vc_par[0]) vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1]; else vc->vc_complement_mask = vc->vc_s_complement_mask; return; } break; case 'n': if (!vc->vc_ques) { if (vc->vc_par[0] == 5) status_report(tty); else if (vc->vc_par[0] == 6) cursor_report(vc, tty); } return; } if (vc->vc_ques) { vc->vc_ques = 0; return; } switch(c) { case 'G': case '`': if (vc->vc_par[0]) vc->vc_par[0]--; gotoxy(vc, vc->vc_par[0], vc->vc_y); return; case 'A': if (!vc->vc_par[0]) vc->vc_par[0]++; gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]); return; case 'B': case 'e': if (!vc->vc_par[0]) vc->vc_par[0]++; gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]); return; case 'C': case 'a': if (!vc->vc_par[0]) vc->vc_par[0]++; gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y); return; case 'D': if (!vc->vc_par[0]) vc->vc_par[0]++; gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y); return; case 'E': if (!vc->vc_par[0]) vc->vc_par[0]++; gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]); return; case 'F': if (!vc->vc_par[0]) vc->vc_par[0]++; gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]); return; case 'd': if (vc->vc_par[0]) vc->vc_par[0]--; gotoxay(vc, vc->vc_x ,vc->vc_par[0]); return; case 'H': case 'f': if (vc->vc_par[0]) vc->vc_par[0]--; if (vc->vc_par[1]) vc->vc_par[1]--; gotoxay(vc, vc->vc_par[1], vc->vc_par[0]); return; case 'J': csi_J(vc, vc->vc_par[0]); return; case 'K': csi_K(vc, vc->vc_par[0]); return; case 'L': csi_L(vc, vc->vc_par[0]); return; case 'M': csi_M(vc, vc->vc_par[0]); return; case 'P': csi_P(vc, vc->vc_par[0]); return; case 'c': if (!vc->vc_par[0]) respond_ID(tty); return; case 'g': if (!vc->vc_par[0]) vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31)); else if (vc->vc_par[0] == 3) { vc->vc_tab_stop[0] = vc->vc_tab_stop[1] = vc->vc_tab_stop[2] = vc->vc_tab_stop[3] = vc->vc_tab_stop[4] = vc->vc_tab_stop[5] = vc->vc_tab_stop[6] = vc->vc_tab_stop[7] = 0; } return; case 'm': csi_m(vc); return; case 'q': /* DECLL - but only 3 leds */ /* map 0,1,2,3 to 0,1,2,4 */ if (vc->vc_par[0] < 4) setledstate(kbd_table + vc->vc_num, (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4); return; case 'r': if (!vc->vc_par[0]) vc->vc_par[0]++; if (!vc->vc_par[1]) vc->vc_par[1] = vc->vc_rows; /* Minimum allowed region is 2 lines */ if (vc->vc_par[0] < vc->vc_par[1] && vc->vc_par[1] <= vc->vc_rows) { vc->vc_top = vc->vc_par[0] - 1; vc->vc_bottom = vc->vc_par[1]; gotoxay(vc, 0, 0); } return; case 's': save_cur(vc); return; case 'u': restore_cur(vc); return; case 'X': csi_X(vc, vc->vc_par[0]); return; case '@': csi_at(vc, vc->vc_par[0]); return; case ']': /* setterm functions */ setterm_command(vc); return; } return; case ESpercent: vc->vc_state = ESnormal; switch (c) { case '@': /* defined in ISO 2022 */ vc->vc_utf = 0; return; case 'G': /* prelim official escape code */ case '8': /* retained for compatibility */ vc->vc_utf = 1; return; } return; case ESfunckey: vc->vc_state = ESnormal; return; case EShash: vc->vc_state = ESnormal; if (c == '8') { /* DEC screen alignment test. kludge :-) */ vc->vc_video_erase_char = (vc->vc_video_erase_char & 0xff00) | 'E'; csi_J(vc, 2); vc->vc_video_erase_char = (vc->vc_video_erase_char & 0xff00) | ' '; do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2); } return; case ESsetG0: if (c == '0') vc->vc_G0_charset = GRAF_MAP; else if (c == 'B') vc->vc_G0_charset = LAT1_MAP; else if (c == 'U') vc->vc_G0_charset = IBMPC_MAP; else if (c == 'K') vc->vc_G0_charset = USER_MAP; if (vc->vc_charset == 0) vc->vc_translate = set_translate(vc->vc_G0_charset, vc); vc->vc_state = ESnormal; return; case ESsetG1: if (c == '0') vc->vc_G1_charset = GRAF_MAP; else if (c == 'B') vc->vc_G1_charset = LAT1_MAP; else if (c == 'U') vc->vc_G1_charset = IBMPC_MAP; else if (c == 'K') vc->vc_G1_charset = USER_MAP; if (vc->vc_charset == 1) vc->vc_translate = set_translate(vc->vc_G1_charset, vc); vc->vc_state = ESnormal; return; default: vc->vc_state = ESnormal; } } /* This is a temporary buffer used to prepare a tty console write * so that we can easily avoid touching user space while holding the * console spinlock. It is allocated in con_init and is shared by * this code and the vc_screen read/write tty calls. * * We have to allocate this statically in the kernel data section * since console_init (and thus con_init) are called before any * kernel memory allocation is available. */ char con_buf[CON_BUF_SIZE]; DEFINE_MUTEX(con_buf_mtx); /* is_double_width() is based on the wcwidth() implementation by * Markus Kuhn -- 2007-05-26 (Unicode 5.0) * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c */ struct interval { uint32_t first; uint32_t last; }; static int bisearch(uint32_t ucs, const struct interval *table, int max) { int min = 0; int mid; if (ucs < table[0].first || ucs > table[max].last) return 0; while (max >= min) { mid = (min + max) / 2; if (ucs > table[mid].last) min = mid + 1; else if (ucs < table[mid].first) max = mid - 1; else return 1; } return 0; } static int is_double_width(uint32_t ucs) { static const struct interval double_width[] = { { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E }, { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF }, { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 }, { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD } }; return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1); } /* acquires console_sem */ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count) { #ifdef VT_BUF_VRAM_ONLY #define FLUSH do { } while(0); #else #define FLUSH if (draw_x >= 0) { \ vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \ draw_x = -1; \ } #endif int c, tc, ok, n = 0, draw_x = -1; unsigned int currcons; unsigned long draw_from = 0, draw_to = 0; struct vc_data *vc; unsigned char vc_attr; struct vt_notifier_param param; uint8_t rescan; uint8_t inverse; uint8_t width; u16 himask, charmask; if (in_interrupt()) return count; might_sleep(); acquire_console_sem(); vc = tty->driver_data; if (vc == NULL) { printk(KERN_ERR "vt: argh, driver_data is NULL !\n"); release_console_sem(); return 0; } currcons = vc->vc_num; if (!vc_cons_allocated(currcons)) { /* could this happen? */ printk_once("con_write: tty %d not allocated\n", currcons+1); release_console_sem(); return 0; } himask = vc->vc_hi_font_mask; charmask = himask ? 0x1ff : 0xff; /* undraw cursor first */ if (IS_FG(vc)) hide_cursor(vc); param.vc = vc; while (!tty->stopped && count) { int orig = *buf; c = orig; buf++; n++; count--; rescan = 0; inverse = 0; width = 1; /* Do no translation at all in control states */ if (vc->vc_state != ESnormal) { tc = c; } else if (vc->vc_utf && !vc->vc_disp_ctrl) { /* Combine UTF-8 into Unicode in vc_utf_char. * vc_utf_count is the number of continuation bytes still * expected to arrive. * vc_npar is the number of continuation bytes arrived so * far */ rescan_last_byte: if ((c & 0xc0) == 0x80) { /* Continuation byte received */ static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff }; if (vc->vc_utf_count) { vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f); vc->vc_npar++; if (--vc->vc_utf_count) { /* Still need some bytes */ continue; } /* Got a whole character */ c = vc->vc_utf_char; /* Reject overlong sequences */ if (c <= utf8_length_changes[vc->vc_npar - 1] || c > utf8_length_changes[vc->vc_npar]) c = 0xfffd; } else { /* Unexpected continuation byte */ vc->vc_utf_count = 0; c = 0xfffd; } } else { /* Single ASCII byte or first byte of a sequence received */ if (vc->vc_utf_count) { /* Continuation byte expected */ rescan = 1; vc->vc_utf_count = 0; c = 0xfffd; } else if (c > 0x7f) { /* First byte of a multibyte sequence received */ vc->vc_npar = 0; if ((c & 0xe0) == 0xc0) { vc->vc_utf_count = 1; vc->vc_utf_char = (c & 0x1f); } else if ((c & 0xf0) == 0xe0) { vc->vc_utf_count = 2; vc->vc_utf_char = (c & 0x0f); } else if ((c & 0xf8) == 0xf0) { vc->vc_utf_count = 3; vc->vc_utf_char = (c & 0x07); } else if ((c & 0xfc) == 0xf8) { vc->vc_utf_count = 4; vc->vc_utf_char = (c & 0x03); } else if ((c & 0xfe) == 0xfc) { vc->vc_utf_count = 5; vc->vc_utf_char = (c & 0x01); } else { /* 254 and 255 are invalid */ c = 0xfffd; } if (vc->vc_utf_count) { /* Still need some bytes */ continue; } } /* Nothing to do if an ASCII byte was received */ } /* End of UTF-8 decoding. */ /* c is the received character, or U+FFFD for invalid sequences. */ /* Replace invalid Unicode code points with U+FFFD too */ if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff) c = 0xfffd; tc = c; } else { /* no utf or alternate charset mode */ tc = vc_translate(vc, c); } param.c = tc; if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE, ¶m) == NOTIFY_STOP) continue; /* If the original code was a control character we * only allow a glyph to be displayed if the code is * not normally used (such as for cursor movement) or * if the disp_ctrl mode has been explicitly enabled. * Certain characters (as given by the CTRL_ALWAYS * bitmap) are always displayed as control characters, * as the console would be pretty useless without * them; to display an arbitrary font position use the * direct-to-font zone in UTF-8 mode. */ ok = tc && (c >= 32 || !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 : vc->vc_utf || ((CTRL_ACTION >> c) & 1))) && (c != 127 || vc->vc_disp_ctrl) && (c != 128+27); if (vc->vc_state == ESnormal && ok) { if (vc->vc_utf && !vc->vc_disp_ctrl) { if (is_double_width(c)) width = 2; } /* Now try to find out how to display it */ tc = conv_uni_to_pc(vc, tc); if (tc & ~charmask) { if (tc == -1 || tc == -2) { continue; /* nothing to display */ } /* Glyph not found */ if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) { /* In legacy mode use the glyph we get by a 1:1 mapping. This would make absolutely no sense with Unicode in mind, but do this for ASCII characters since a font may lack Unicode mapping info and we don't want to end up with having question marks only. */ tc = c; } else { /* Display U+FFFD. If it's not found, display an inverse question mark. */ tc = conv_uni_to_pc(vc, 0xfffd); if (tc < 0) { inverse = 1; tc = conv_uni_to_pc(vc, '?'); if (tc < 0) tc = '?'; } } } if (!inverse) { vc_attr = vc->vc_attr; } else { /* invert vc_attr */ if (!vc->vc_can_do_color) { vc_attr = (vc->vc_attr) ^ 0x08; } else if (vc->vc_hi_font_mask == 0x100) { vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4); } else { vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4); } FLUSH } while (1) { if (vc->vc_need_wrap || vc->vc_decim) FLUSH if (vc->vc_need_wrap) { cr(vc); lf(vc); } if (vc->vc_decim) insert_char(vc, 1); scr_writew(himask ? ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) : (vc_attr << 8) + tc, (u16 *) vc->vc_pos); if (DO_UPDATE(vc) && draw_x < 0) { draw_x = vc->vc_x; draw_from = vc->vc_pos; } if (vc->vc_x == vc->vc_cols - 1) { vc->vc_need_wrap = vc->vc_decawm; draw_to = vc->vc_pos + 2; } else { vc->vc_x++; draw_to = (vc->vc_pos += 2); } if (!--width) break; tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */ if (tc < 0) tc = ' '; } notify_write(vc, c); if (inverse) { FLUSH } if (rescan) { rescan = 0; inverse = 0; width = 1; c = orig; goto rescan_last_byte; } continue; } FLUSH do_con_trol(tty, vc, orig); } FLUSH console_conditional_schedule(); release_console_sem(); notify_update(vc); return n; #undef FLUSH } /* * This is the console switching callback. * * Doing console switching in a process context allows * us to do the switches asynchronously (needed when we want * to switch due to a keyboard interrupt). Synchronization * with other console code and prevention of re-entrancy is * ensured with console_sem. */ static void console_callback(struct work_struct *ignored) { acquire_console_sem(); if (want_console >= 0) { if (want_console != fg_console && vc_cons_allocated(want_console)) { hide_cursor(vc_cons[fg_console].d); change_console(vc_cons[want_console].d); /* we only changed when the console had already been allocated - a new console is not created in an interrupt routine */ } want_console = -1; } if (do_poke_blanked_console) { /* do not unblank for a LED change */ do_poke_blanked_console = 0; poke_blanked_console(); } if (scrollback_delta) { struct vc_data *vc = vc_cons[fg_console].d; clear_selection(); if (vc->vc_mode == KD_TEXT) vc->vc_sw->con_scrolldelta(vc, scrollback_delta); scrollback_delta = 0; } if (blank_timer_expired) { do_blank_screen(0); blank_timer_expired = 0; } notify_update(vc_cons[fg_console].d); release_console_sem(); } int set_console(int nr) { struct vc_data *vc = vc_cons[fg_console].d; if (!vc_cons_allocated(nr) || vt_dont_switch || (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) { /* * Console switch will fail in console_callback() or * change_console() so there is no point scheduling * the callback * * Existing set_console() users don't check the return * value so this shouldn't break anything */ return -EINVAL; } want_console = nr; schedule_console_callback(); return 0; } struct tty_driver *console_driver; #ifdef CONFIG_VT_CONSOLE /** * vt_kmsg_redirect() - Sets/gets the kernel message console * @new: The new virtual terminal number or -1 if the console should stay * unchanged * * By default, the kernel messages are always printed on the current virtual * console. However, the user may modify that default with the * TIOCL_SETKMSGREDIRECT ioctl call. * * This function sets the kernel message console to be @new. It returns the old * virtual console number. The virtual terminal number 0 (both as parameter and * return value) means no redirection (i.e. always printed on the currently * active console). * * The parameter -1 means that only the current console is returned, but the * value is not modified. You may use the macro vt_get_kmsg_redirect() in that * case to make the code more understandable. * * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores * the parameter and always returns 0. */ int vt_kmsg_redirect(int new) { static int kmsg_con; if (new != -1) return xchg(&kmsg_con, new); else return kmsg_con; } /* * Console on virtual terminal * * The console must be locked when we get here. */ static void vt_console_print(struct console *co, const char *b, unsigned count) { struct vc_data *vc = vc_cons[fg_console].d; unsigned char c; static DEFINE_SPINLOCK(printing_lock); const ushort *start; ushort cnt = 0; ushort myx; int kmsg_console; /* console busy or not yet initialized */ if (!printable) return; if (!spin_trylock(&printing_lock)) return; kmsg_console = vt_get_kmsg_redirect(); if (kmsg_console && vc_cons_allocated(kmsg_console - 1)) vc = vc_cons[kmsg_console - 1].d; /* read `x' only after setting currcons properly (otherwise the `x' macro will read the x of the foreground console). */ myx = vc->vc_x; if (!vc_cons_allocated(fg_console)) { /* impossible */ /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */ goto quit; } if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc)) goto quit; /* undraw cursor first */ if (IS_FG(vc)) hide_cursor(vc); start = (ushort *)vc->vc_pos; /* Contrived structure to try to emulate original need_wrap behaviour * Problems caused when we have need_wrap set on '\n' character */ while (count--) { c = *b++; if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) { if (cnt > 0) { if (CON_IS_VISIBLE(vc)) vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x); vc->vc_x += cnt; if (vc->vc_need_wrap) vc->vc_x--; cnt = 0; } if (c == 8) { /* backspace */ bs(vc); start = (ushort *)vc->vc_pos; myx = vc->vc_x; continue; } if (c != 13) lf(vc); cr(vc); start = (ushort *)vc->vc_pos; myx = vc->vc_x; if (c == 10 || c == 13) continue; } scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos); notify_write(vc, c); cnt++; if (myx == vc->vc_cols - 1) { vc->vc_need_wrap = 1; continue; } vc->vc_pos += 2; myx++; } if (cnt > 0) { if (CON_IS_VISIBLE(vc)) vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x); vc->vc_x += cnt; if (vc->vc_x == vc->vc_cols) { vc->vc_x--; vc->vc_need_wrap = 1; } } set_cursor(vc); notify_update(vc); quit: spin_unlock(&printing_lock); } static struct tty_driver *vt_console_device(struct console *c, int *index) { *index = c->index ? c->index-1 : fg_console; return console_driver; } static struct console vt_console_driver = { .name = "tty", .write = vt_console_print, .device = vt_console_device, .unblank = unblank_screen, .flags = CON_PRINTBUFFER, .index = -1, }; #endif /* * Handling of Linux-specific VC ioctls */ /* * Generally a bit racy with respect to console_sem(). * * There are some functions which don't need it. * * There are some functions which can sleep for arbitrary periods * (paste_selection) but we don't need the lock there anyway. * * set_selection has locking, and definitely needs it */ int tioclinux(struct tty_struct *tty, unsigned long arg) { char type, data; char __user *p = (char __user *)arg; int lines; int ret; if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN)) return -EPERM; if (get_user(type, p)) return -EFAULT; ret = 0; switch (type) { case TIOCL_SETSEL: acquire_console_sem(); ret = set_selection((struct tiocl_selection __user *)(p+1), tty); release_console_sem(); break; case TIOCL_PASTESEL: ret = paste_selection(tty); break; case TIOCL_UNBLANKSCREEN: acquire_console_sem(); unblank_screen(); release_console_sem(); break; case TIOCL_SELLOADLUT: ret = sel_loadlut(p); break; case TIOCL_GETSHIFTSTATE: /* * Make it possible to react to Shift+Mousebutton. * Note that 'shift_state' is an undocumented * kernel-internal variable; programs not closely * related to the kernel should not use this. */ data = shift_state; ret = __put_user(data, p); break; case TIOCL_GETMOUSEREPORTING: data = mouse_reporting(); ret = __put_user(data, p); break; case TIOCL_SETVESABLANK: ret = set_vesa_blanking(p); break; case TIOCL_GETKMSGREDIRECT: data = vt_get_kmsg_redirect(); ret = __put_user(data, p); break; case TIOCL_SETKMSGREDIRECT: if (!capable(CAP_SYS_ADMIN)) { ret = -EPERM; } else { if (get_user(data, p+1)) ret = -EFAULT; else vt_kmsg_redirect(data); } break; case TIOCL_GETFGCONSOLE: ret = fg_console; break; case TIOCL_SCROLLCONSOLE: if (get_user(lines, (s32 __user *)(p+4))) { ret = -EFAULT; } else { scrollfront(vc_cons[fg_console].d, lines); ret = 0; } break; case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */ acquire_console_sem(); ignore_poke = 1; do_blank_screen(0); release_console_sem(); break; case TIOCL_BLANKEDSCREEN: ret = console_blanked; break; default: ret = -EINVAL; break; } return ret; } /* * /dev/ttyN handling */ static int con_write(struct tty_struct *tty, const unsigned char *buf, int count) { int retval; retval = do_con_write(tty, buf, count); con_flush_chars(tty); return retval; } static int con_put_char(struct tty_struct *tty, unsigned char ch) { if (in_interrupt()) return 0; /* n_r3964 calls put_char() from interrupt context */ return do_con_write(tty, &ch, 1); } static int con_write_room(struct tty_struct *tty) { if (tty->stopped) return 0; return 32768; /* No limit, really; we're not buffering */ } static int con_chars_in_buffer(struct tty_struct *tty) { return 0; /* we're not buffering */ } /* * con_throttle and con_unthrottle are only used for * paste_selection(), which has to stuff in a large number of * characters... */ static void con_throttle(struct tty_struct *tty) { } static void con_unthrottle(struct tty_struct *tty) { struct vc_data *vc = tty->driver_data; wake_up_interruptible(&vc->paste_wait); } /* * Turn the Scroll-Lock LED on when the tty is stopped */ static void con_stop(struct tty_struct *tty) { int console_num; if (!tty) return; console_num = tty->index; if (!vc_cons_allocated(console_num)) return; set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK); set_leds(); } /* * Turn the Scroll-Lock LED off when the console is started */ static void con_start(struct tty_struct *tty) { int console_num; if (!tty) return; console_num = tty->index; if (!vc_cons_allocated(console_num)) return; clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK); set_leds(); } static void con_flush_chars(struct tty_struct *tty) { struct vc_data *vc; if (in_interrupt()) /* from flush_to_ldisc */ return; /* if we race with con_close(), vt may be null */ acquire_console_sem(); vc = tty->driver_data; if (vc) set_cursor(vc); release_console_sem(); } /* * Allocate the console screen memory. */ static int con_open(struct tty_struct *tty, struct file *filp) { unsigned int currcons = tty->index; int ret = 0; acquire_console_sem(); if (tty->driver_data == NULL) { ret = vc_allocate(currcons); if (ret == 0) { struct vc_data *vc = vc_cons[currcons].d; /* Still being freed */ if (vc->port.tty) { release_console_sem(); return -ERESTARTSYS; } tty->driver_data = vc; vc->port.tty = tty; if (!tty->winsize.ws_row && !tty->winsize.ws_col) { tty->winsize.ws_row = vc_cons[currcons].d->vc_rows; tty->winsize.ws_col = vc_cons[currcons].d->vc_cols; } if (vc->vc_utf) tty->termios->c_iflag |= IUTF8; else tty->termios->c_iflag &= ~IUTF8; release_console_sem(); return ret; } } release_console_sem(); return ret; } static void con_close(struct tty_struct *tty, struct file *filp) { /* Nothing to do - we defer to shutdown */ } static void con_shutdown(struct tty_struct *tty) { struct vc_data *vc = tty->driver_data; BUG_ON(vc == NULL); acquire_console_sem(); vc->port.tty = NULL; release_console_sem(); tty_shutdown(tty); } static int default_italic_color = 2; // green (ASCII) static int default_underline_color = 3; // cyan (ASCII) module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR); module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR); static void vc_init(struct vc_data *vc, unsigned int rows, unsigned int cols, int do_clear) { int j, k ; vc->vc_cols = cols; vc->vc_rows = rows; vc->vc_size_row = cols << 1; vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row; set_origin(vc); vc->vc_pos = vc->vc_origin; reset_vc(vc); for (j=k=0; j<16; j++) { vc->vc_palette[k++] = default_red[j] ; vc->vc_palette[k++] = default_grn[j] ; vc->vc_palette[k++] = default_blu[j] ; } vc->vc_def_color = 0x07; /* white */ vc->vc_ulcolor = default_underline_color; vc->vc_itcolor = default_italic_color; vc->vc_halfcolor = 0x08; /* grey */ init_waitqueue_head(&vc->paste_wait); reset_terminal(vc, do_clear); } /* * This routine initializes console interrupts, and does nothing * else. If you want the screen to clear, call tty_write with * the appropriate escape-sequence. */ static int __init con_init(void) { const char *display_desc = NULL; struct vc_data *vc; unsigned int currcons = 0, i; acquire_console_sem(); if (conswitchp) display_desc = conswitchp->con_startup(); if (!display_desc) { fg_console = 0; release_console_sem(); return 0; } for (i = 0; i < MAX_NR_CON_DRIVER; i++) { struct con_driver *con_driver = ®istered_con_driver[i]; if (con_driver->con == NULL) { con_driver->con = conswitchp; con_driver->desc = display_desc; con_driver->flag = CON_DRIVER_FLAG_INIT; con_driver->first = 0; con_driver->last = MAX_NR_CONSOLES - 1; break; } } for (i = 0; i < MAX_NR_CONSOLES; i++) con_driver_map[i] = conswitchp; if (blankinterval) { blank_state = blank_normal_wait; mod_timer(&console_timer, jiffies + (blankinterval * HZ)); } for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) { vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT); INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK); tty_port_init(&vc->port); visual_init(vc, currcons, 1); vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT); vc_init(vc, vc->vc_rows, vc->vc_cols, currcons || !vc->vc_sw->con_save_screen); } currcons = fg_console = 0; master_display_fg = vc = vc_cons[currcons].d; set_origin(vc); save_screen(vc); gotoxy(vc, vc->vc_x, vc->vc_y); csi_J(vc, 0); update_screen(vc); printk("Console: %s %s %dx%d", vc->vc_can_do_color ? "colour" : "mono", display_desc, vc->vc_cols, vc->vc_rows); printable = 1; printk("\n"); release_console_sem(); #ifdef CONFIG_VT_CONSOLE register_console(&vt_console_driver); #endif return 0; } console_initcall(con_init); static const struct tty_operations con_ops = { .open = con_open, .close = con_close, .write = con_write, .write_room = con_write_room, .put_char = con_put_char, .flush_chars = con_flush_chars, .chars_in_buffer = con_chars_in_buffer, .ioctl = vt_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = vt_compat_ioctl, #endif .stop = con_stop, .start = con_start, .throttle = con_throttle, .unthrottle = con_unthrottle, .resize = vt_resize, .shutdown = con_shutdown }; static struct cdev vc0_cdev; int __init vty_init(const struct file_operations *console_fops) { cdev_init(&vc0_cdev, console_fops); if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) || register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0) panic("Couldn't register /dev/tty0 driver\n"); device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0"); vcs_init(); console_driver = alloc_tty_driver(MAX_NR_CONSOLES); if (!console_driver) panic("Couldn't allocate console driver\n"); console_driver->owner = THIS_MODULE; console_driver->name = "tty"; console_driver->name_base = 1; console_driver->major = TTY_MAJOR; console_driver->minor_start = 1; console_driver->type = TTY_DRIVER_TYPE_CONSOLE; console_driver->init_termios = tty_std_termios; if (default_utf8) console_driver->init_termios.c_iflag |= IUTF8; console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS; tty_set_operations(console_driver, &con_ops); if (tty_register_driver(console_driver)) panic("Couldn't register console driver\n"); kbd_init(); console_map_init(); #ifdef CONFIG_MDA_CONSOLE mda_console_init(); #endif return 0; } #ifndef VT_SINGLE_DRIVER static struct class *vtconsole_class; static int bind_con_driver(const struct consw *csw, int first, int last, int deflt) { struct module *owner = csw->owner; const char *desc = NULL; struct con_driver *con_driver; int i, j = -1, k = -1, retval = -ENODEV; if (!try_module_get(owner)) return -ENODEV; acquire_console_sem(); /* check if driver is registered */ for (i = 0; i < MAX_NR_CON_DRIVER; i++) { con_driver = ®istered_con_driver[i]; if (con_driver->con == csw) { desc = con_driver->desc; retval = 0; break; } } if (retval) goto err; if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) { csw->con_startup(); con_driver->flag |= CON_DRIVER_FLAG_INIT; } if (deflt) { if (conswitchp) module_put(conswitchp->owner); __module_get(owner); conswitchp = csw; } first = max(first, con_driver->first); last = min(last, con_driver->last); for (i = first; i <= last; i++) { int old_was_color; struct vc_data *vc = vc_cons[i].d; if (con_driver_map[i]) module_put(con_driver_map[i]->owner); __module_get(owner); con_driver_map[i] = csw; if (!vc || !vc->vc_sw) continue; j = i; if (CON_IS_VISIBLE(vc)) { k = i; save_screen(vc); } old_was_color = vc->vc_can_do_color; vc->vc_sw->con_deinit(vc); vc->vc_origin = (unsigned long)vc->vc_screenbuf; visual_init(vc, i, 0); set_origin(vc); update_attr(vc); /* If the console changed between mono <-> color, then * the attributes in the screenbuf will be wrong. The * following resets all attributes to something sane. */ if (old_was_color != vc->vc_can_do_color) clear_buffer_attributes(vc); } printk("Console: switching "); if (!deflt) printk("consoles %d-%d ", first+1, last+1); if (j >= 0) { struct vc_data *vc = vc_cons[j].d; printk("to %s %s %dx%d\n", vc->vc_can_do_color ? "colour" : "mono", desc, vc->vc_cols, vc->vc_rows); if (k >= 0) { vc = vc_cons[k].d; update_screen(vc); } } else printk("to %s\n", desc); retval = 0; err: release_console_sem(); module_put(owner); return retval; }; #ifdef CONFIG_VT_HW_CONSOLE_BINDING static int con_is_graphics(const struct consw *csw, int first, int last) { int i, retval = 0; for (i = first; i <= last; i++) { struct vc_data *vc = vc_cons[i].d; if (vc && vc->vc_mode == KD_GRAPHICS) { retval = 1; break; } } return retval; } /** * unbind_con_driver - unbind a console driver * @csw: pointer to console driver to unregister * @first: first in range of consoles that @csw should be unbound from * @last: last in range of consoles that @csw should be unbound from * @deflt: should next bound console driver be default after @csw is unbound? * * To unbind a driver from all possible consoles, pass 0 as @first and * %MAX_NR_CONSOLES as @last. * * @deflt controls whether the console that ends up replacing @csw should be * the default console. * * RETURNS: * -ENODEV if @csw isn't a registered console driver or can't be unregistered * or 0 on success. */ int unbind_con_driver(const struct consw *csw, int first, int last, int deflt) { struct module *owner = csw->owner; const struct consw *defcsw = NULL; struct con_driver *con_driver = NULL, *con_back = NULL; int i, retval = -ENODEV; if (!try_module_get(owner)) return -ENODEV; acquire_console_sem(); /* check if driver is registered and if it is unbindable */ for (i = 0; i < MAX_NR_CON_DRIVER; i++) { con_driver = ®istered_con_driver[i]; if (con_driver->con == csw && con_driver->flag & CON_DRIVER_FLAG_MODULE) { retval = 0; break; } } if (retval) { release_console_sem(); goto err; } retval = -ENODEV; /* check if backup driver exists */ for (i = 0; i < MAX_NR_CON_DRIVER; i++) { con_back = ®istered_con_driver[i]; if (con_back->con && !(con_back->flag & CON_DRIVER_FLAG_MODULE)) { defcsw = con_back->con; retval = 0; break; } } if (retval) { release_console_sem(); goto err; } if (!con_is_bound(csw)) { release_console_sem(); goto err; } first = max(first, con_driver->first); last = min(last, con_driver->last); for (i = first; i <= last; i++) { if (con_driver_map[i] == csw) { module_put(csw->owner); con_driver_map[i] = NULL; } } if (!con_is_bound(defcsw)) { const struct consw *defconsw = conswitchp; defcsw->con_startup(); con_back->flag |= CON_DRIVER_FLAG_INIT; /* * vgacon may change the default driver to point * to dummycon, we restore it here... */ conswitchp = defconsw; } if (!con_is_bound(csw)) con_driver->flag &= ~CON_DRIVER_FLAG_INIT; release_console_sem(); /* ignore return value, binding should not fail */ bind_con_driver(defcsw, first, last, deflt); err: module_put(owner); return retval; } EXPORT_SYMBOL(unbind_con_driver); static int vt_bind(struct con_driver *con) { const struct consw *defcsw = NULL, *csw = NULL; int i, more = 1, first = -1, last = -1, deflt = 0; if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) || con_is_graphics(con->con, con->first, con->last)) goto err; csw = con->con; for (i = 0; i < MAX_NR_CON_DRIVER; i++) { struct con_driver *con = ®istered_con_driver[i]; if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) { defcsw = con->con; break; } } if (!defcsw) goto err; while (more) { more = 0; for (i = con->first; i <= con->last; i++) { if (con_driver_map[i] == defcsw) { if (first == -1) first = i; last = i; more = 1; } else if (first != -1) break; } if (first == 0 && last == MAX_NR_CONSOLES -1) deflt = 1; if (first != -1) bind_con_driver(csw, first, last, deflt); first = -1; last = -1; deflt = 0; } err: return 0; } static int vt_unbind(struct con_driver *con) { const struct consw *csw = NULL; int i, more = 1, first = -1, last = -1, deflt = 0; if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) || con_is_graphics(con->con, con->first, con->last)) goto err; csw = con->con; while (more) { more = 0; for (i = con->first; i <= con->last; i++) { if (con_driver_map[i] == csw) { if (first == -1) first = i; last = i; more = 1; } else if (first != -1) break; } if (first == 0 && last == MAX_NR_CONSOLES -1) deflt = 1; if (first != -1) unbind_con_driver(csw, first, last, deflt); first = -1; last = -1; deflt = 0; } err: return 0; } #else static inline int vt_bind(struct con_driver *con) { return 0; } static inline int vt_unbind(struct con_driver *con) { return 0; } #endif /* CONFIG_VT_HW_CONSOLE_BINDING */ static ssize_t store_bind(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct con_driver *con = dev_get_drvdata(dev); int bind = simple_strtoul(buf, NULL, 0); if (bind) vt_bind(con); else vt_unbind(con); return count; } static ssize_t show_bind(struct device *dev, struct device_attribute *attr, char *buf) { struct con_driver *con = dev_get_drvdata(dev); int bind = con_is_bound(con->con); return snprintf(buf, PAGE_SIZE, "%i\n", bind); } static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf) { struct con_driver *con = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%s %s\n", (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)", con->desc); } static struct device_attribute device_attrs[] = { __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind), __ATTR(name, S_IRUGO, show_name, NULL), }; static int vtconsole_init_device(struct con_driver *con) { int i; int error = 0; con->flag |= CON_DRIVER_FLAG_ATTR; dev_set_drvdata(con->dev, con); for (i = 0; i < ARRAY_SIZE(device_attrs); i++) { error = device_create_file(con->dev, &device_attrs[i]); if (error) break; } if (error) { while (--i >= 0) device_remove_file(con->dev, &device_attrs[i]); con->flag &= ~CON_DRIVER_FLAG_ATTR; } return error; } static void vtconsole_deinit_device(struct con_driver *con) { int i; if (con->flag & CON_DRIVER_FLAG_ATTR) { for (i = 0; i < ARRAY_SIZE(device_attrs); i++) device_remove_file(con->dev, &device_attrs[i]); con->flag &= ~CON_DRIVER_FLAG_ATTR; } } /** * con_is_bound - checks if driver is bound to the console * @csw: console driver * * RETURNS: zero if unbound, nonzero if bound * * Drivers can call this and if zero, they should release * all resources allocated on con_startup() */ int con_is_bound(const struct consw *csw) { int i, bound = 0; for (i = 0; i < MAX_NR_CONSOLES; i++) { if (con_driver_map[i] == csw) { bound = 1; break; } } return bound; } EXPORT_SYMBOL(con_is_bound); /** * con_debug_enter - prepare the console for the kernel debugger * @sw: console driver * * Called when the console is taken over by the kernel debugger, this * function needs to save the current console state, then put the console * into a state suitable for the kernel debugger. * * RETURNS: * Zero on success, nonzero if a failure occurred when trying to prepare * the console for the debugger. */ int con_debug_enter(struct vc_data *vc) { int ret = 0; saved_fg_console = fg_console; saved_last_console = last_console; saved_want_console = want_console; saved_vc_mode = vc->vc_mode; saved_console_blanked = console_blanked; vc->vc_mode = KD_TEXT; console_blanked = 0; if (vc->vc_sw->con_debug_enter) ret = vc->vc_sw->con_debug_enter(vc); #ifdef CONFIG_KGDB_KDB /* Set the initial LINES variable if it is not already set */ if (vc->vc_rows < 999) { int linecount; char lns[4]; const char *setargs[3] = { "set", "LINES", lns, }; if (kdbgetintenv(setargs[0], &linecount)) { snprintf(lns, 4, "%i", vc->vc_rows); kdb_set(2, setargs); } } #endif /* CONFIG_KGDB_KDB */ return ret; } EXPORT_SYMBOL_GPL(con_debug_enter); /** * con_debug_leave - restore console state * @sw: console driver * * Restore the console state to what it was before the kernel debugger * was invoked. * * RETURNS: * Zero on success, nonzero if a failure occurred when trying to restore * the console. */ int con_debug_leave(void) { struct vc_data *vc; int ret = 0; fg_console = saved_fg_console; last_console = saved_last_console; want_console = saved_want_console; console_blanked = saved_console_blanked; vc_cons[fg_console].d->vc_mode = saved_vc_mode; vc = vc_cons[fg_console].d; if (vc->vc_sw->con_debug_leave) ret = vc->vc_sw->con_debug_leave(vc); return ret; } EXPORT_SYMBOL_GPL(con_debug_leave); /** * register_con_driver - register console driver to console layer * @csw: console driver * @first: the first console to take over, minimum value is 0 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1 * * DESCRIPTION: This function registers a console driver which can later * bind to a range of consoles specified by @first and @last. It will * also initialize the console driver by calling con_startup(). */ int register_con_driver(const struct consw *csw, int first, int last) { struct module *owner = csw->owner; struct con_driver *con_driver; const char *desc; int i, retval = 0; if (!try_module_get(owner)) return -ENODEV; acquire_console_sem(); for (i = 0; i < MAX_NR_CON_DRIVER; i++) { con_driver = ®istered_con_driver[i]; /* already registered */ if (con_driver->con == csw) retval = -EINVAL; } if (retval) goto err; desc = csw->con_startup(); if (!desc) goto err; retval = -EINVAL; for (i = 0; i < MAX_NR_CON_DRIVER; i++) { con_driver = ®istered_con_driver[i]; if (con_driver->con == NULL) { con_driver->con = csw; con_driver->desc = desc; con_driver->node = i; con_driver->flag = CON_DRIVER_FLAG_MODULE | CON_DRIVER_FLAG_INIT; con_driver->first = first; con_driver->last = last; retval = 0; break; } } if (retval) goto err; con_driver->dev = device_create(vtconsole_class, NULL, MKDEV(0, con_driver->node), NULL, "vtcon%i", con_driver->node); if (IS_ERR(con_driver->dev)) { printk(KERN_WARNING "Unable to create device for %s; " "errno = %ld\n", con_driver->desc, PTR_ERR(con_driver->dev)); con_driver->dev = NULL; } else { vtconsole_init_device(con_driver); } err: release_console_sem(); module_put(owner); return retval; } EXPORT_SYMBOL(register_con_driver); /** * unregister_con_driver - unregister console driver from console layer * @csw: console driver * * DESCRIPTION: All drivers that registers to the console layer must * call this function upon exit, or if the console driver is in a state * where it won't be able to handle console services, such as the * framebuffer console without loaded framebuffer drivers. * * The driver must unbind first prior to unregistration. */ int unregister_con_driver(const struct consw *csw) { int i, retval = -ENODEV; acquire_console_sem(); /* cannot unregister a bound driver */ if (con_is_bound(csw)) goto err; for (i = 0; i < MAX_NR_CON_DRIVER; i++) { struct con_driver *con_driver = ®istered_con_driver[i]; if (con_driver->con == csw && con_driver->flag & CON_DRIVER_FLAG_MODULE) { vtconsole_deinit_device(con_driver); device_destroy(vtconsole_class, MKDEV(0, con_driver->node)); con_driver->con = NULL; con_driver->desc = NULL; con_driver->dev = NULL; con_driver->node = 0; con_driver->flag = 0; con_driver->first = 0; con_driver->last = 0; retval = 0; break; } } err: release_console_sem(); return retval; } EXPORT_SYMBOL(unregister_con_driver); /* * If we support more console drivers, this function is used * when a driver wants to take over some existing consoles * and become default driver for newly opened ones. * * take_over_console is basically a register followed by unbind */ int take_over_console(const struct consw *csw, int first, int last, int deflt) { int err; err = register_con_driver(csw, first, last); if (!err) bind_con_driver(csw, first, last, deflt); return err; } /* * give_up_console is a wrapper to unregister_con_driver. It will only * work if driver is fully unbound. */ void give_up_console(const struct consw *csw) { unregister_con_driver(csw); } static int __init vtconsole_class_init(void) { int i; vtconsole_class = class_create(THIS_MODULE, "vtconsole"); if (IS_ERR(vtconsole_class)) { printk(KERN_WARNING "Unable to create vt console class; " "errno = %ld\n", PTR_ERR(vtconsole_class)); vtconsole_class = NULL; } /* Add system drivers to sysfs */ for (i = 0; i < MAX_NR_CON_DRIVER; i++) { struct con_driver *con = ®istered_con_driver[i]; if (con->con && !con->dev) { con->dev = device_create(vtconsole_class, NULL, MKDEV(0, con->node), NULL, "vtcon%i", con->node); if (IS_ERR(con->dev)) { printk(KERN_WARNING "Unable to create " "device for %s; errno = %ld\n", con->desc, PTR_ERR(con->dev)); con->dev = NULL; } else { vtconsole_init_device(con); } } } return 0; } postcore_initcall(vtconsole_class_init); #endif /* * Screen blanking */ static int set_vesa_blanking(char __user *p) { unsigned int mode; if (get_user(mode, p + 1)) return -EFAULT; vesa_blank_mode = (mode < 4) ? mode : 0; return 0; } void do_blank_screen(int entering_gfx) { struct vc_data *vc = vc_cons[fg_console].d; int i; WARN_CONSOLE_UNLOCKED(); if (console_blanked) { if (blank_state == blank_vesa_wait) { blank_state = blank_off; vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0); } return; } /* entering graphics mode? */ if (entering_gfx) { hide_cursor(vc); save_screen(vc); vc->vc_sw->con_blank(vc, -1, 1); console_blanked = fg_console + 1; blank_state = blank_off; set_origin(vc); return; } if (blank_state != blank_normal_wait) return; blank_state = blank_off; /* don't blank graphics */ if (vc->vc_mode != KD_TEXT) { console_blanked = fg_console + 1; return; } hide_cursor(vc); del_timer_sync(&console_timer); blank_timer_expired = 0; save_screen(vc); /* In case we need to reset origin, blanking hook returns 1 */ i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0); console_blanked = fg_console + 1; if (i) set_origin(vc); if (console_blank_hook && console_blank_hook(1)) return; if (vesa_off_interval && vesa_blank_mode) { blank_state = blank_vesa_wait; mod_timer(&console_timer, jiffies + vesa_off_interval); } vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num); } EXPORT_SYMBOL(do_blank_screen); /* * Called by timer as well as from vt_console_driver */ void do_unblank_screen(int leaving_gfx) { struct vc_data *vc; /* This should now always be called from a "sane" (read: can schedule) * context for the sake of the low level drivers, except in the special * case of oops_in_progress */ if (!oops_in_progress) might_sleep(); WARN_CONSOLE_UNLOCKED(); ignore_poke = 0; if (!console_blanked) return; if (!vc_cons_allocated(fg_console)) { /* impossible */ printk("unblank_screen: tty %d not allocated ??\n", fg_console+1); return; } vc = vc_cons[fg_console].d; /* Try to unblank in oops case too */ if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc)) return; /* but leave console_blanked != 0 */ if (blankinterval) { mod_timer(&console_timer, jiffies + (blankinterval * HZ)); blank_state = blank_normal_wait; } console_blanked = 0; if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc)) /* Low-level driver cannot restore -> do it ourselves */ update_screen(vc); if (console_blank_hook) console_blank_hook(0); set_palette(vc); set_cursor(vc); vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num); } EXPORT_SYMBOL(do_unblank_screen); /* * This is called by the outside world to cause a forced unblank, mostly for * oopses. Currently, I just call do_unblank_screen(0), but we could eventually * call it with 1 as an argument and so force a mode restore... that may kill * X or at least garbage the screen but would also make the Oops visible... */ void unblank_screen(void) { do_unblank_screen(0); } /* * We defer the timer blanking to work queue so it can take the console mutex * (console operations can still happen at irq time, but only from printk which * has the console mutex. Not perfect yet, but better than no locking */ static void blank_screen_t(unsigned long dummy) { if (unlikely(!keventd_up())) { mod_timer(&console_timer, jiffies + (blankinterval * HZ)); return; } blank_timer_expired = 1; schedule_work(&console_work); } void poke_blanked_console(void) { WARN_CONSOLE_UNLOCKED(); /* Add this so we quickly catch whoever might call us in a non * safe context. Nowadays, unblank_screen() isn't to be called in * atomic contexts and is allowed to schedule (with the special case * of oops_in_progress, but that isn't of any concern for this * function. --BenH. */ might_sleep(); /* This isn't perfectly race free, but a race here would be mostly harmless, * at worse, we'll do a spurrious blank and it's unlikely */ del_timer(&console_timer); blank_timer_expired = 0; if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS) return; if (console_blanked) unblank_screen(); else if (blankinterval) { mod_timer(&console_timer, jiffies + (blankinterval * HZ)); blank_state = blank_normal_wait; } } /* * Palettes */ static void set_palette(struct vc_data *vc) { WARN_CONSOLE_UNLOCKED(); if (vc->vc_mode != KD_GRAPHICS) vc->vc_sw->con_set_palette(vc, color_table); } static int set_get_cmap(unsigned char __user *arg, int set) { int i, j, k; WARN_CONSOLE_UNLOCKED(); for (i = 0; i < 16; i++) if (set) { get_user(default_red[i], arg++); get_user(default_grn[i], arg++); get_user(default_blu[i], arg++); } else { put_user(default_red[i], arg++); put_user(default_grn[i], arg++); put_user(default_blu[i], arg++); } if (set) { for (i = 0; i < MAX_NR_CONSOLES; i++) if (vc_cons_allocated(i)) { for (j = k = 0; j < 16; j++) { vc_cons[i].d->vc_palette[k++] = default_red[j]; vc_cons[i].d->vc_palette[k++] = default_grn[j]; vc_cons[i].d->vc_palette[k++] = default_blu[j]; } set_palette(vc_cons[i].d); } } return 0; } /* * Load palette into the DAC registers. arg points to a colour * map, 3 bytes per colour, 16 colours, range from 0 to 255. */ int con_set_cmap(unsigned char __user *arg) { int rc; acquire_console_sem(); rc = set_get_cmap (arg,1); release_console_sem(); return rc; } int con_get_cmap(unsigned char __user *arg) { int rc; acquire_console_sem(); rc = set_get_cmap (arg,0); release_console_sem(); return rc; } void reset_palette(struct vc_data *vc) { int j, k; for (j=k=0; j<16; j++) { vc->vc_palette[k++] = default_red[j]; vc->vc_palette[k++] = default_grn[j]; vc->vc_palette[k++] = default_blu[j]; } set_palette(vc); } /* * Font switching * * Currently we only support fonts up to 32 pixels wide, at a maximum height * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, * depending on width) reserved for each character which is kinda wasty, but * this is done in order to maintain compatibility with the EGA/VGA fonts. It * is upto the actual low-level console-driver convert data into its favorite * format (maybe we should add a `fontoffset' field to the `display' * structure so we won't have to convert the fontdata all the time. * /Jes */ #define max_font_size 65536 static int con_font_get(struct vc_data *vc, struct console_font_op *op) { struct console_font font; int rc = -EINVAL; int c; if (vc->vc_mode != KD_TEXT) return -EINVAL; if (op->data) { font.data = kmalloc(max_font_size, GFP_KERNEL); if (!font.data) return -ENOMEM; } else font.data = NULL; acquire_console_sem(); if (vc->vc_sw->con_font_get) rc = vc->vc_sw->con_font_get(vc, &font); else rc = -ENOSYS; release_console_sem(); if (rc) goto out; c = (font.width+7)/8 * 32 * font.charcount; if (op->data && font.charcount > op->charcount) rc = -ENOSPC; if (!(op->flags & KD_FONT_FLAG_OLD)) { if (font.width > op->width || font.height > op->height) rc = -ENOSPC; } else { if (font.width != 8) rc = -EIO; else if ((op->height && font.height > op->height) || font.height > 32) rc = -ENOSPC; } if (rc) goto out; op->height = font.height; op->width = font.width; op->charcount = font.charcount; if (op->data && copy_to_user(op->data, font.data, c)) rc = -EFAULT; out: kfree(font.data); return rc; } static int con_font_set(struct vc_data *vc, struct console_font_op *op) { struct console_font font; int rc = -EINVAL; int size; if (vc->vc_mode != KD_TEXT) return -EINVAL; if (!op->data) return -EINVAL; if (op->charcount > 512) return -EINVAL; if (!op->height) { /* Need to guess font height [compat] */ int h, i; u8 __user *charmap = op->data; u8 tmp; /* If from KDFONTOP ioctl, don't allow things which can be done in userland, so that we can get rid of this soon */ if (!(op->flags & KD_FONT_FLAG_OLD)) return -EINVAL; for (h = 32; h > 0; h--) for (i = 0; i < op->charcount; i++) { if (get_user(tmp, &charmap[32*i+h-1])) return -EFAULT; if (tmp) goto nonzero; } return -EINVAL; nonzero: op->height = h; } if (op->width <= 0 || op->width > 32 || op->height > 32) return -EINVAL; size = (op->width+7)/8 * 32 * op->charcount; if (size > max_font_size) return -ENOSPC; font.charcount = op->charcount; font.height = op->height; font.width = op->width; font.data = memdup_user(op->data, size); if (IS_ERR(font.data)) return PTR_ERR(font.data); acquire_console_sem(); if (vc->vc_sw->con_font_set) rc = vc->vc_sw->con_font_set(vc, &font, op->flags); else rc = -ENOSYS; release_console_sem(); kfree(font.data); return rc; } static int con_font_default(struct vc_data *vc, struct console_font_op *op) { struct console_font font = {.width = op->width, .height = op->height}; char name[MAX_FONT_NAME]; char *s = name; int rc; if (vc->vc_mode != KD_TEXT) return -EINVAL; if (!op->data) s = NULL; else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0) return -EFAULT; else name[MAX_FONT_NAME - 1] = 0; acquire_console_sem(); if (vc->vc_sw->con_font_default) rc = vc->vc_sw->con_font_default(vc, &font, s); else rc = -ENOSYS; release_console_sem(); if (!rc) { op->width = font.width; op->height = font.height; } return rc; } static int con_font_copy(struct vc_data *vc, struct console_font_op *op) { int con = op->height; int rc; if (vc->vc_mode != KD_TEXT) return -EINVAL; acquire_console_sem(); if (!vc->vc_sw->con_font_copy) rc = -ENOSYS; else if (con < 0 || !vc_cons_allocated(con)) rc = -ENOTTY; else if (con == vc->vc_num) /* nothing to do */ rc = 0; else rc = vc->vc_sw->con_font_copy(vc, con); release_console_sem(); return rc; } int con_font_op(struct vc_data *vc, struct console_font_op *op) { switch (op->op) { case KD_FONT_OP_SET: return con_font_set(vc, op); case KD_FONT_OP_GET: return con_font_get(vc, op); case KD_FONT_OP_SET_DEFAULT: return con_font_default(vc, op); case KD_FONT_OP_COPY: return con_font_copy(vc, op); } return -ENOSYS; } /* * Interface exported to selection and vcs. */ /* used by selection */ u16 screen_glyph(struct vc_data *vc, int offset) { u16 w = scr_readw(screenpos(vc, offset, 1)); u16 c = w & 0xff; if (w & vc->vc_hi_font_mask) c |= 0x100; return c; } EXPORT_SYMBOL_GPL(screen_glyph); /* used by vcs - note the word offset */ unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed) { return screenpos(vc, 2 * w_offset, viewed); } void getconsxy(struct vc_data *vc, unsigned char *p) { p[0] = vc->vc_x; p[1] = vc->vc_y; } void putconsxy(struct vc_data *vc, unsigned char *p) { hide_cursor(vc); gotoxy(vc, p[0], p[1]); set_cursor(vc); } u16 vcs_scr_readw(struct vc_data *vc, const u16 *org) { if ((unsigned long)org == vc->vc_pos && softcursor_original != -1) return softcursor_original; return scr_readw(org); } void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org) { scr_writew(val, org); if ((unsigned long)org == vc->vc_pos) { softcursor_original = -1; add_softcursor(vc); } } void vcs_scr_updated(struct vc_data *vc) { notify_update(vc); } /* * Visible symbols for modules */ EXPORT_SYMBOL(color_table); EXPORT_SYMBOL(default_red); EXPORT_SYMBOL(default_grn); EXPORT_SYMBOL(default_blu); EXPORT_SYMBOL(update_region); EXPORT_SYMBOL(redraw_screen); EXPORT_SYMBOL(vc_resize); EXPORT_SYMBOL(fg_console); EXPORT_SYMBOL(console_blank_hook); EXPORT_SYMBOL(console_blanked); EXPORT_SYMBOL(vc_cons); EXPORT_SYMBOL(global_cursor_default); #ifndef VT_SINGLE_DRIVER EXPORT_SYMBOL(take_over_console); EXPORT_SYMBOL(give_up_console); #endif