drivers/char/console.c

/* */
This source file includes following definitions.
gotoxy
__set_origin
scrollback
scrollfront
set_origin
hide_cursor
set_cursor
scrup
scrdown
lf
ri
cr
bs
del
csi_J
csi_K
update_attr
default_attr
csi_m
respond_string
respond_num
cursor_report
status_report
respond_ID
invert_screen
set_mode
setterm_command
insert_char
insert_line
delete_char
delete_line
csi_at
csi_L
csi_P
csi_M
save_cur
restore_cur
reset_terminal
con_write
do_keyboard_interrupt
memsetw
console_print
con_init
kbdsave
get_scrmem
set_scrmem
blank_screen
unblank_screen
update_screen
do_screendump
con_open
highlight
inword
atedge
limit
set_selection
paste_selection
clear_selection
   1 /*
   2  *  linux/kernel/console.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6 
   7 /*
   8  *      console.c
   9  *
  10  * This module exports the console io functions:
  11  * 
  12  *      'long con_init(long)'
  13  *      'void con_open(struct tty_queue * queue, struct )'
  14  *      'void update_screen(int new_console)'
  15  *      'void blank_screen(void)'
  16  *      'void unblank_screen(void)'
  17  * 
  18  * Hopefully this will be a rather complete VT102 implementation.
  19  *
  20  * Beeping thanks to John T Kohl.
  21  * 
  22  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  23  *   Chars, and VT100 enhancements by Peter MacDonald.
  24  *
  25  * Copy and paste function by Andrew Haylett.
  26  */
  27 
  28 /*
  29  *  NOTE!!! We sometimes disable and enable interrupts for a short while
  30  * (to put a word in video IO), but this will work even for keyboard
  31  * interrupts. We know interrupts aren't enabled when getting a keyboard
  32  * interrupt, as we use trap-gates. Hopefully all is well.
  33  */
  34 
  35 /*
  36  * Code to check for different video-cards mostly by Galen Hunt,
  37  * <g-hunt@ee.utah.edu>
  38  */
  39 
  40 #include <linux/sched.h>
  41 #include <linux/timer.h>
  42 #include <linux/tty.h>
  43 #include <linux/config.h>
  44 #include <linux/kernel.h>
  45 #include <linux/string.h>
  46 #include <linux/errno.h>
  47 #include <linux/kd.h>
  48 #include <linux/keyboard.h>
  49 
  50 #include <asm/io.h>
  51 #include <asm/system.h>
  52 #include <asm/segment.h>
  53 
  54 #include "vt_kern.h"
  55 
  56 #ifdef CONFIG_SELECTION
  57 #include <linux/ctype.h>
  58 
  59 /* Routines for selection control. */
  60 int set_selection(const int arg);
  61 int paste_selection(struct tty_struct *tty);
  62 static void clear_selection(void);
  63 
  64 /* Variables for selection control. */
  65 #define SEL_BUFFER_SIZE TTY_BUF_SIZE
  66 static int sel_cons;
  67 static int sel_start = -1;
  68 static int sel_end;
  69 static char sel_buffer[SEL_BUFFER_SIZE] = { '\0' };
  70 #endif /* CONFIG_SELECTION */
  71 
  72 #define NPAR 16
  73 
  74 extern void vt_init(void);
  75 extern void register_console(void (*proc)(const char *));
  76 
  77 unsigned long   video_num_columns;              /* Number of text columns       */
  78 unsigned long   video_num_lines;                /* Number of test lines         */
  79 
  80 static unsigned char    video_type;             /* Type of display being used   */
  81 static unsigned long    video_mem_base;         /* Base of video memory         */
  82 static unsigned long    video_mem_term;         /* End of video memory          */
  83 static unsigned long    video_size_row;         /* Bytes per row                */
  84 static unsigned char    video_page;             /* Initial video page           */
  85 static unsigned short   video_port_reg;         /* Video register select port   */
  86 static unsigned short   video_port_val;         /* Video register value port    */
  87 static int can_do_color = 0;
  88 static int printable = 0;
  89 
  90 static struct {
  91         unsigned short  vc_video_erase_char;    /* Background erase character */
  92         unsigned char   vc_attr;                /* Current attributes */
  93         unsigned char   vc_def_color;           /* Default colors */
  94         unsigned char   vc_color;               /* Foreground & background */
  95         unsigned char   vc_s_color;             /* Saved foreground & background */
  96         unsigned char   vc_ulcolor;             /* Colour for underline mode */
  97         unsigned char   vc_halfcolor;           /* Colour for half intensity mode */
  98         unsigned long   vc_origin;              /* Used for EGA/VGA fast scroll */
  99         unsigned long   vc_scr_end;             /* Used for EGA/VGA fast scroll */
 100         unsigned long   vc_pos;
 101         unsigned long   vc_x,vc_y;
 102         unsigned long   vc_top,vc_bottom;
 103         unsigned long   vc_state;
 104         unsigned long   vc_npar,vc_par[NPAR];
 105         unsigned long   vc_video_mem_start;     /* Start of video RAM           */
 106         unsigned long   vc_video_mem_end;       /* End of video RAM (sort of)   */
 107         unsigned long   vc_saved_x;
 108         unsigned long   vc_saved_y;
 109         /* mode flags */
 110         unsigned long   vc_charset      : 1;    /* Character set G0 / G1 */
 111         unsigned long   vc_s_charset    : 1;    /* Saved character set */
 112         unsigned long   vc_decscnm      : 1;    /* Screen Mode */
 113         unsigned long   vc_decom        : 1;    /* Origin Mode */
 114         unsigned long   vc_decawm       : 1;    /* Autowrap Mode */
 115         unsigned long   vc_deccm        : 1;    /* Cursor Visible */
 116         unsigned long   vc_decim        : 1;    /* Insert Mode */
 117         /* attribute flags */
 118         unsigned long   vc_intensity    : 2;    /* 0=half-bright, 1=normal, 2=bold */
 119         unsigned long   vc_underline    : 1;
 120         unsigned long   vc_blink        : 1;
 121         unsigned long   vc_reverse      : 1;
 122         unsigned long   vc_s_intensity  : 2;    /* saved rendition */
 123         unsigned long   vc_s_underline  : 1;
 124         unsigned long   vc_s_blink      : 1;
 125         unsigned long   vc_s_reverse    : 1;
 126         /* misc */
 127         unsigned long   vc_ques         : 1;
 128         unsigned long   vc_need_wrap    : 1;
 129         unsigned long   vc_tab_stop[5];         /* Tab stops. 160 columns. */
 130         unsigned char   vc_kbdmode;
 131         unsigned char * vc_translate;
 132         unsigned char * vc_G0_charset;
 133         unsigned char * vc_G1_charset;
 134         unsigned char * vc_saved_G0;
 135         unsigned char * vc_saved_G1;
 136         /* additional information is in vt_kern.h */
 137 } vc_cons [NR_CONSOLES];
 138 
 139 unsigned short *vc_scrbuf[NR_CONSOLES];
 140 static unsigned short * vc_scrmembuf;
 141 static int console_blanked = 0;
 142 
 143 #define origin          (vc_cons[currcons].vc_origin)
 144 #define scr_end         (vc_cons[currcons].vc_scr_end)
 145 #define pos             (vc_cons[currcons].vc_pos)
 146 #define top             (vc_cons[currcons].vc_top)
 147 #define bottom          (vc_cons[currcons].vc_bottom)
 148 #define x               (vc_cons[currcons].vc_x)
 149 #define y               (vc_cons[currcons].vc_y)
 150 #define state           (vc_cons[currcons].vc_state)
 151 #define npar            (vc_cons[currcons].vc_npar)
 152 #define par             (vc_cons[currcons].vc_par)
 153 #define ques            (vc_cons[currcons].vc_ques)
 154 #define attr            (vc_cons[currcons].vc_attr)
 155 #define saved_x         (vc_cons[currcons].vc_saved_x)
 156 #define saved_y         (vc_cons[currcons].vc_saved_y)
 157 #define translate       (vc_cons[currcons].vc_translate)
 158 #define G0_charset      (vc_cons[currcons].vc_G0_charset)
 159 #define G1_charset      (vc_cons[currcons].vc_G1_charset)
 160 #define saved_G0        (vc_cons[currcons].vc_saved_G0)
 161 #define saved_G1        (vc_cons[currcons].vc_saved_G1)
 162 #define video_mem_start (vc_cons[currcons].vc_video_mem_start)
 163 #define video_mem_end   (vc_cons[currcons].vc_video_mem_end)
 164 #define video_erase_char (vc_cons[currcons].vc_video_erase_char)        
 165 #define decscnm         (vc_cons[currcons].vc_decscnm)
 166 #define decom           (vc_cons[currcons].vc_decom)
 167 #define decawm          (vc_cons[currcons].vc_decawm)
 168 #define deccm           (vc_cons[currcons].vc_deccm)
 169 #define decim           (vc_cons[currcons].vc_decim)
 170 #define need_wrap       (vc_cons[currcons].vc_need_wrap)
 171 #define color           (vc_cons[currcons].vc_color)
 172 #define s_color         (vc_cons[currcons].vc_s_color)
 173 #define def_color       (vc_cons[currcons].vc_def_color)
 174 #define foreground      (color & 0x0f)
 175 #define background      (color & 0xf0)
 176 #define charset         (vc_cons[currcons].vc_charset)
 177 #define s_charset       (vc_cons[currcons].vc_s_charset)
 178 #define intensity       (vc_cons[currcons].vc_intensity)
 179 #define underline       (vc_cons[currcons].vc_underline)
 180 #define blink           (vc_cons[currcons].vc_blink)
 181 #define reverse         (vc_cons[currcons].vc_reverse)
 182 #define s_intensity     (vc_cons[currcons].vc_s_intensity)
 183 #define s_underline     (vc_cons[currcons].vc_s_underline)
 184 #define s_blink         (vc_cons[currcons].vc_s_blink)
 185 #define s_reverse       (vc_cons[currcons].vc_s_reverse)
 186 #define ulcolor         (vc_cons[currcons].vc_ulcolor)
 187 #define halfcolor       (vc_cons[currcons].vc_halfcolor)
 188 #define kbdmode         (vc_cons[currcons].vc_kbdmode)
 189 #define tab_stop        (vc_cons[currcons].vc_tab_stop)
 190 #define vcmode          (vt_cons[currcons].vc_mode)
 191 #define vtmode          (vt_cons[currcons].vt_mode)
 192 #define vtpid           (vt_cons[currcons].vt_pid)
 193 #define vtnewvt         (vt_cons[currcons].vt_newvt)
 194 
 195 #define set_kbd(x) set_vc_kbd_flag(kbd_table+currcons,x)
 196 #define clr_kbd(x) clr_vc_kbd_flag(kbd_table+currcons,x)
 197 #define is_kbd(x) vc_kbd_flag(kbd_table+currcons,x)
 198 
 199 #define decarm          VC_REPEAT
 200 #define decckm          VC_CKMODE
 201 #define kbdapplic       VC_APPLIC
 202 #define kbdraw          VC_RAW
 203 #define lnm             VC_CRLF
 204 
 205 int blankinterval = 10*60*HZ;
 206 static int screen_size = 0;
 207 
 208 /*
 209  * this is what the terminal answers to a ESC-Z or csi0c query.
 210  */
 211 #define VT100ID "\033[?1;2c"
 212 #define VT102ID "\033[?6c"
 213 
 214 static unsigned char * translations[] = {
 215 /* 8-bit Latin-1 mapped to the PC charater set: '\0' means non-printable */
 216 (unsigned char *)
 217         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 218         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 219         " !\"#$%&'()*+,-./0123456789:;<=>?"
 220         "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_"
 221         "`abcdefghijklmnopqrstuvwxyz{|}~\0"
 222         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 223         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 224         "\040\255\233\234\376\235\174\025\376\376\246\256\252\055\376\376"
 225         "\370\361\375\376\376\346\024\371\376\376\247\257\254\253\376\250"
 226         "\376\376\376\376\216\217\222\200\376\220\376\376\376\376\376\376"
 227         "\376\245\376\376\376\376\231\376\235\376\376\376\232\376\376\341"
 228         "\205\240\203\376\204\206\221\207\212\202\210\211\215\241\214\213"
 229         "\376\244\225\242\223\376\224\366\233\227\243\226\201\376\376\230",
 230 /* vt100 graphics */
 231 (unsigned char *)
 232         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 233         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 234         " !\"#$%&'()*+,-./0123456789:;<=>?"
 235         "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^ "
 236         "\004\261\007\007\007\007\370\361\040\007\331\277\332\300\305\007"
 237         "\007\304\007\007\303\264\301\302\263\007\007\007\007\007\234\0"
 238         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 239         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 240         "\040\255\233\234\376\235\174\025\376\376\246\256\252\055\376\376"
 241         "\370\361\375\376\376\346\024\371\376\376\247\257\254\253\376\250"
 242         "\376\376\376\376\216\217\222\200\376\220\376\376\376\376\376\376"
 243         "\376\245\376\376\376\376\231\376\376\376\376\376\232\376\376\341"
 244         "\205\240\203\376\204\206\221\207\212\202\210\211\215\241\214\213"
 245         "\376\244\225\242\223\376\224\366\376\227\243\226\201\376\376\230",
 246 /* IBM graphics: minimal translations (BS, CR, LF, LL, SO, SI and ESC) */
 247 (unsigned char *)
 248         "\000\001\002\003\004\005\006\007\000\011\000\013\000\000\000\000"
 249         "\020\021\022\023\024\025\026\027\030\031\032\000\034\035\036\037"
 250         "\040\041\042\043\044\045\046\047\050\051\052\053\054\055\056\057"
 251         "\060\061\062\063\064\065\066\067\070\071\072\073\074\075\076\077"
 252         "\100\101\102\103\104\105\106\107\110\111\112\113\114\115\116\117"
 253         "\120\121\122\123\124\125\126\127\130\131\132\133\134\135\136\137"
 254         "\140\141\142\143\144\145\146\147\150\151\152\153\154\155\156\157"
 255         "\160\161\162\163\164\165\166\167\170\171\172\173\174\175\176\177"
 256         "\200\201\202\203\204\205\206\207\210\211\212\213\214\215\216\217"
 257         "\220\221\222\223\224\225\226\227\230\231\232\233\234\235\236\237"
 258         "\240\241\242\243\244\245\246\247\250\251\252\253\254\255\256\257"
 259         "\260\261\262\263\264\265\266\267\270\271\272\273\274\275\276\277"
 260         "\300\301\302\303\304\305\306\307\310\311\312\313\314\315\316\317"
 261         "\320\321\322\323\324\325\326\327\330\331\332\333\334\335\336\337"
 262         "\340\341\342\343\344\345\346\347\350\351\352\353\354\355\356\357"
 263         "\360\361\362\363\364\365\366\367\370\371\372\373\374\375\376\377"
 264 };
 265 
 266 #define NORM_TRANS (translations[0])
 267 #define GRAF_TRANS (translations[1])
 268 #define NULL_TRANS (translations[2])
 269 
 270 static unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 271                                        8,12,10,14, 9,13,11,15 };
 272 
 273 /*
 274  * gotoxy() must verify all boundaries, because the arguments
 275  * might also be negative. If the given position is out of
 276  * bounds, the cursor is placed at the nearest margin.
 277  */
 278 static void gotoxy(int currcons, int new_x, int new_y)
     /*  */
 279 {
 280         int max_y;
 281 
 282         if (new_x < 0)
 283                 x = 0;
 284         else
 285                 if (new_x >= video_num_columns)
 286                         x = video_num_columns - 1;
 287                 else
 288                         x = new_x;
 289         if (decom) {
 290                 new_y += top;
 291                 max_y = bottom;
 292         } else
 293                 max_y = video_num_lines;
 294         if (new_y < 0)
 295                 y = 0;
 296         else
 297                 if (new_y >= max_y)
 298                         y = max_y - 1;
 299                 else
 300                         y = new_y;
 301         pos = origin + y*video_size_row + (x<<1);
 302         need_wrap = 0;
 303 }
 304 
 305 /*
 306  * *Very* limited hardware scrollback support..
 307  */
 308 static unsigned short __real_origin;
 309 static unsigned short __origin;
 310 
 311 static inline void __set_origin(unsigned short offset)
     /*  */
 312 {
 313         unsigned long flags;
 314 #ifdef CONFIG_SELECTION
 315         clear_selection();
 316 #endif /* CONFIG_SELECTION */
 317         save_flags(flags); cli();
 318         __origin = offset;
 319         outb_p(12, video_port_reg);
 320         outb_p(offset >> 8, video_port_val);
 321         outb_p(13, video_port_reg);
 322         outb_p(offset, video_port_val);
 323         restore_flags(flags);
 324 }
 325 
 326 void scrollback(int lines)
     /*  */
 327 {
 328         if (!lines)
 329                 lines = video_num_lines/2;
 330         lines *= video_num_columns;
 331         lines = __origin - lines;
 332         if (lines < 0)
 333                 lines = 0;
 334         __set_origin(lines);
 335 }
 336 
 337 void scrollfront(int lines)
     /*  */
 338 {
 339         if (!lines)
 340                 lines = video_num_lines/2;
 341         lines *= video_num_columns;
 342         lines = __origin + lines;
 343         if (lines > __real_origin)
 344                 lines = __real_origin;
 345         __set_origin(lines);
 346 }
 347 
 348 static void set_origin(int currcons)
     /*  */
 349 {
 350         if (video_type != VIDEO_TYPE_EGAC && video_type != VIDEO_TYPE_EGAM)
 351                 return;
 352         if (currcons != fg_console || console_blanked || vcmode == KD_GRAPHICS)
 353                 return;
 354         __real_origin = (origin-video_mem_base) >> 1;
 355         __set_origin(__real_origin);
 356 }
 357 
 358 static inline void hide_cursor(int currcons)
     /*  */
 359 {
 360         outb_p(14, video_port_reg);
 361         outb_p(0xff&((scr_end-video_mem_base)>>9), video_port_val);
 362         outb_p(15, video_port_reg);
 363         outb_p(0xff&((scr_end-video_mem_base)>>1), video_port_val);
 364 }
 365 
 366 static inline void set_cursor(int currcons)
     /*  */
 367 {
 368         unsigned long flags;
 369 
 370         if (currcons != fg_console || console_blanked || vcmode == KD_GRAPHICS)
 371                 return;
 372         if (__real_origin != __origin)
 373                 set_origin(__real_origin);
 374         save_flags(flags); cli();
 375         if (deccm) {
 376                 outb_p(14, video_port_reg);
 377                 outb_p(0xff&((pos-video_mem_base)>>9), video_port_val);
 378                 outb_p(15, video_port_reg);
 379                 outb_p(0xff&((pos-video_mem_base)>>1), video_port_val);
 380         } else
 381                 hide_cursor(currcons);
 382         restore_flags(flags);
 383 }
 384 
 385 static void scrup(int currcons, unsigned int t, unsigned int b)
     /*  */
 386 {
 387         int hardscroll = 1;
 388 
 389         if (b > video_num_lines || t >= b)
 390                 return;
 391         if (video_type != VIDEO_TYPE_EGAC && video_type != VIDEO_TYPE_EGAM)
 392                 hardscroll = 0;
 393         else if (t || b != video_num_lines)
 394                 hardscroll = 0;
 395         if (hardscroll) {
 396                 origin += video_size_row;
 397                 pos += video_size_row;
 398                 scr_end += video_size_row;
 399                 if (scr_end > video_mem_end) {
 400                         __asm__("cld\n\t"
 401                                 "rep\n\t"
 402                                 "movsl\n\t"
 403                                 "movl _video_num_columns,%1\n\t"
 404                                 "rep\n\t"
 405                                 "stosw"
 406                                 : /* no output */
 407                                 :"a" (video_erase_char),
 408                                 "c" ((video_num_lines-1)*video_num_columns>>1),
 409                                 "D" (video_mem_start),
 410                                 "S" (origin)
 411                                 :"cx","di","si");
 412                         scr_end -= origin-video_mem_start;
 413                         pos -= origin-video_mem_start;
 414                         origin = video_mem_start;
 415                 } else {
 416                         __asm__("cld\n\t"
 417                                 "rep\n\t"
 418                                 "stosw"
 419                                 : /* no output */
 420                                 :"a" (video_erase_char),
 421                                 "c" (video_num_columns),
 422                                 "D" (scr_end-video_size_row)
 423                                 :"cx","di");
 424                 }
 425                 set_origin(currcons);
 426         } else {
 427                 __asm__("cld\n\t"
 428                         "rep\n\t"
 429                         "movsl\n\t"
 430                         "movl _video_num_columns,%%ecx\n\t"
 431                         "rep\n\t"
 432                         "stosw"
 433                         : /* no output */
 434                         :"a" (video_erase_char),
 435                         "c" ((b-t-1)*video_num_columns>>1),
 436                         "D" (origin+video_size_row*t),
 437                         "S" (origin+video_size_row*(t+1))
 438                         :"cx","di","si");
 439         }
 440 }
 441 
 442 static void scrdown(int currcons, unsigned int t, unsigned int b)
     /*  */
 443 {
 444         if (b > video_num_lines || t >= b)
 445                 return;
 446         __asm__("std\n\t"
 447                 "rep\n\t"
 448                 "movsl\n\t"
 449                 "addl $2,%%edi\n\t"     /* %edi has been decremented by 4 */
 450                 "movl _video_num_columns,%%ecx\n\t"
 451                 "rep\n\t"
 452                 "stosw\n\t"
 453                 "cld"
 454                 : /* no output */
 455                 :"a" (video_erase_char),
 456                 "c" ((b-t-1)*video_num_columns>>1),
 457                 "D" (origin+video_size_row*b-4),
 458                 "S" (origin+video_size_row*(b-1)-4)
 459                 :"ax","cx","di","si");
 460 }
 461 
 462 static void lf(int currcons)
     /*  */
 463 {
 464         if (y+1<bottom) {
 465                 y++;
 466                 pos += video_size_row;
 467                 return;
 468         } else 
 469                 scrup(currcons,top,bottom);
 470         need_wrap = 0;
 471 }
 472 
 473 static void ri(int currcons)
     /*  */
 474 {
 475         if (y>top) {
 476                 y--;
 477                 pos -= video_size_row;
 478                 return;
 479         } else
 480                 scrdown(currcons,top,bottom);
 481         need_wrap = 0;
 482 }
 483 
 484 static inline void cr(int currcons)
     /*  */
 485 {
 486         pos -= x<<1;
 487         need_wrap = x = 0;
 488 }
 489 
 490 static inline void bs(int currcons)
     /*  */
 491 {
 492         if (x) {
 493                 pos -= 2;
 494                 x--;
 495                 need_wrap = 0;
 496         }
 497 }
 498 
 499 static inline void del(int currcons)
     /*  */
 500 {
 501         if (x) {
 502                 pos -= 2;
 503                 x--;
 504                 *(unsigned short *)pos = video_erase_char;
 505                 need_wrap = 0;
 506         }
 507 }
 508 
 509 static void csi_J(int currcons, int vpar)
     /*  */
 510 {
 511         unsigned long count;
 512         unsigned long start;
 513 
 514         switch (vpar) {
 515                 case 0: /* erase from cursor to end of display */
 516                         count = (scr_end-pos)>>1;
 517                         start = pos;
 518                         break;
 519                 case 1: /* erase from start to cursor */
 520                         count = ((pos-origin)>>1)+1;
 521                         start = origin;
 522                         break;
 523                 case 2: /* erase whole display */
 524                         count = video_num_columns * video_num_lines;
 525                         start = origin;
 526                         break;
 527                 default:
 528                         return;
 529         }
 530         __asm__("cld\n\t"
 531                 "rep\n\t"
 532                 "stosw\n\t"
 533                 : /* no output */
 534                 :"c" (count),
 535                 "D" (start),"a" (video_erase_char)
 536                 :"cx","di");
 537         need_wrap = 0;
 538 }
 539 
 540 static void csi_K(int currcons, int vpar)
     /*  */
 541 {
 542         long count;
 543         long start;
 544 
 545         switch (vpar) {
 546                 case 0: /* erase from cursor to end of line */
 547                         count = video_num_columns-x;
 548                         start = pos;
 549                         break;
 550                 case 1: /* erase from start of line to cursor */
 551                         start = pos - (x<<1);
 552                         count = x+1;
 553                         break;
 554                 case 2: /* erase whole line */
 555                         start = pos - (x<<1);
 556                         count = video_num_columns;
 557                         break;
 558                 default:
 559                         return;
 560         }
 561         __asm__("cld\n\t"
 562                 "rep\n\t"
 563                 "stosw\n\t"
 564                 : /* no output */
 565                 :"c" (count),
 566                 "D" (start),"a" (video_erase_char)
 567                 :"cx","di");
 568         need_wrap = 0;
 569 }
 570 
 571 /*
 572  *  I hope this works. The monochrome part is untested.
 573  */
 574 static void update_attr(int currcons)
     /*  */
 575 {
 576         attr = color;
 577         if (can_do_color) {
 578                 if (underline)
 579                         attr = (attr & 0xf0) | ulcolor;
 580                 else if (intensity == 0)
 581                         attr = (attr & 0xf0) | halfcolor;
 582         }
 583         if (reverse ^ decscnm)
 584                 attr = (attr & 0x88) | (((attr >> 4) | (attr << 4)) & 0x77);
 585         if (blink)
 586                 attr ^= 0x80;
 587         if (intensity == 2)
 588                 attr ^= 0x08;
 589         if (!can_do_color) {
 590                 if (underline)
 591                         attr = (attr & 0xf8) | 0x01;
 592                 else if (intensity == 0)
 593                         attr = (attr & 0xf0) | 0x08;
 594         }
 595         if (decscnm)
 596                 video_erase_char = ((color & 0x88) | (((color >> 4) |
 597                         (color << 4)) & 0x77) << 8) | ' ';
 598         else
 599                 video_erase_char = (color << 8) | ' ';
 600 }
 601 
 602 static void default_attr(int currcons)
     /*  */
 603 {
 604         intensity = 1;
 605         underline = 0;
 606         reverse = 0;
 607         blink = 0;
 608         color = def_color;
 609 }
 610 
 611 static void csi_m(int currcons)
     /*  */
 612 {
 613         int i;
 614 
 615         for (i=0;i<=npar;i++)
 616                 switch (par[i]) {
 617                         case 0: /* all attributes off */
 618                                 default_attr(currcons);
 619                                 break;
 620                         case 1:
 621                                 intensity = 2;
 622                                 break;
 623                         case 2:
 624                                 intensity = 0;
 625                                 break;
 626                         case 4:
 627                                 underline = 1;
 628                                 break;
 629                         case 5:
 630                                 blink = 1;
 631                                 break;
 632                         case 7:
 633                                 reverse = 1;
 634                                 break;
 635                         case 21:
 636                         case 22:
 637                                 intensity = 1;
 638                                 break;
 639                         case 24:
 640                                 underline = 0;
 641                                 break;
 642                         case 25:
 643                                 blink = 0;
 644                                 break;
 645                         case 27:
 646                                 reverse = 0;
 647                                 break;
 648                         case 39:
 649                                 color = (def_color & 0x0f) | background;
 650                                 break;
 651                         case 49:
 652                                 color = (def_color & 0xf0) | foreground;
 653                                 break;
 654                         default:
 655                                 if (par[i] >= 30 && par[i] <= 37)
 656                                         color = color_table[par[i]-30]
 657                                                 | background; 
 658                                 else if (par[i] >= 40 && par[i] <= 47)
 659                                         color = (color_table[par[i]-40]<<4)
 660                                                 | foreground;
 661                                 break;
 662                 }
 663         update_attr(currcons);
 664 }
 665 
 666 static void respond_string(char * p, int currcons, struct tty_struct * tty)
     /*  */
 667 {
 668         while (*p) {
 669                 put_tty_queue(*p, &tty->read_q);
 670                 p++;
 671         }
 672         TTY_READ_FLUSH(tty);
 673 }
 674 
 675 static void respond_num(unsigned int n, int currcons, struct tty_struct * tty)
     /*  */
 676 {
 677         char buff[3];
 678         int i = 0;
 679 
 680         do {
 681                 buff[i++] = (n%10)+'0';
 682                 n /= 10;
 683         } while(n && i < 3);    /* We'll take no chances */
 684         while (i--) {
 685                 put_tty_queue(buff[i], &tty->read_q);
 686         }
 687         /* caller must flush */
 688 }
 689 
 690 static void cursor_report(int currcons, struct tty_struct * tty)
     /*  */
 691 {
 692         put_tty_queue('\033', &tty->read_q);
 693         put_tty_queue('[', &tty->read_q);
 694         respond_num(y + (decom ? top+1 : 1), currcons, tty);
 695         put_tty_queue(';', &tty->read_q);
 696         respond_num(x+1, currcons, tty);
 697         put_tty_queue('R', &tty->read_q);
 698         TTY_READ_FLUSH(tty);
 699 }
 700 
 701 static inline void status_report(int currcons, struct tty_struct * tty)
     /*  */
 702 {
 703         respond_string("\033[0n", currcons, tty);       /* Terminal ok */
 704 }
 705 
 706 static inline void respond_ID(int currcons, struct tty_struct * tty)
     /*  */
 707 {
 708         respond_string(VT102ID, currcons, tty);
 709 }
 710 
 711 static void invert_screen(int currcons) {
     /*  */
 712         unsigned char *p;
 713 
 714         if (can_do_color)
 715                 for (p = (unsigned char *)origin+1; p < (unsigned char *)scr_end; p+=2)
 716                         *p = (*p & 0x88) | (((*p >> 4) | (*p << 4)) & 0x77);
 717         else
 718                 for (p = (unsigned char *)origin+1; p < (unsigned char *)scr_end; p+=2)
 719                         *p ^= *p & 0x07 == 1 ? 0x70 : 0x77;
 720 }
 721 
 722 static void set_mode(int currcons, int on_off)
     /*  */
 723 {
 724         int i;
 725 
 726         for (i=0; i<=npar; i++)
 727                 if (ques) switch(par[i]) {      /* DEC private modes set/reset */
 728                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
 729                                 if (on_off)
 730                                         set_kbd(decckm);
 731                                 else
 732                                         clr_kbd(decckm);
 733                                 break;
 734                         case 3: /* 80/132 mode switch unimplemented */
 735                                 csi_J(currcons,2);
 736                                 gotoxy(currcons,0,0);
 737                                 break;
 738                         case 5:                 /* Inverted screen on/off */
 739                                 if (decscnm != on_off) {
 740                                         decscnm = on_off;
 741                                         invert_screen(currcons);
 742                                         update_attr(currcons);
 743                                 }
 744                                 break;
 745                         case 6:                 /* Origin relative/absolute */
 746                                 decom = on_off;
 747                                 gotoxy(currcons,0,0);
 748                                 break;
 749                         case 7:                 /* Autowrap on/off */
 750                                 decawm = on_off;
 751                                 break;
 752                         case 8:                 /* Autorepeat on/off */
 753                                 if (on_off)
 754                                         set_kbd(decarm);
 755                                 else
 756                                         clr_kbd(decarm);
 757                                 break;
 758                         case 25:                /* Cursor on/off */
 759                                 deccm = on_off;
 760                                 set_cursor(currcons);
 761                                 break;
 762                 } else switch(par[i]) {         /* ANSI modes set/reset */
 763                         case 4:                 /* Insert Mode on/off */
 764                                 decim = on_off;
 765                                 break;
 766                         case 20:                /* Lf, Enter == CrLf/Lf */
 767                                 if (on_off)
 768                                         set_kbd(lnm);
 769                                 else
 770                                         clr_kbd(lnm);
 771                                 break;
 772                 }
 773 }
 774 
 775 static void setterm_command(int currcons)
     /*  */
 776 {
 777         switch(par[0]) {
 778                 case 1: /* set color for underline mode */
 779                         if (can_do_color && par[1] < 16) {
 780                                 ulcolor = color_table[par[1]];
 781                                 if (underline)
 782                                         update_attr(currcons);
 783                         }
 784                         break;
 785                 case 2: /* set color for half intensity mode */
 786                         if (can_do_color && par[1] < 16) {
 787                                 halfcolor = color_table[par[1]];
 788                                 if (intensity == 0)
 789                                         update_attr(currcons);
 790                         }
 791                         break;
 792                 case 8: /* store colors as defaults */
 793                         def_color = attr;
 794                         default_attr(currcons);
 795                         update_attr(currcons);
 796                         break;
 797                 case 9: /* set blanking interval */
 798                         blankinterval = ((par[1] < 60) ? par[1] : 60) * 60 * HZ;
 799                         break;
 800         }
 801 }
 802 
 803 static void insert_char(int currcons)
     /*  */
 804 {
 805         unsigned int i = x;
 806         unsigned short tmp, old = video_erase_char;
 807         unsigned short * p = (unsigned short *) pos;
 808 
 809         while (i++ < video_num_columns) {
 810                 tmp = *p;
 811                 *p = old;
 812                 old = tmp;
 813                 p++;
 814         }
 815         need_wrap = 0;
 816 }
 817 
 818 static void insert_line(int currcons)
     /*  */
 819 {
 820         scrdown(currcons,y,bottom);
 821         need_wrap = 0;
 822 }
 823 
 824 static void delete_char(int currcons)
     /*  */
 825 {
 826         unsigned int i = x;
 827         unsigned short * p = (unsigned short *) pos;
 828 
 829         while (++i < video_num_columns) {
 830                 *p = *(p+1);
 831                 p++;
 832         }
 833         *p = video_erase_char;
 834         need_wrap = 0;
 835 }
 836 
 837 static void delete_line(int currcons)
     /*  */
 838 {
 839         scrup(currcons,y,bottom);
 840         need_wrap = 0;
 841 }
 842 
 843 static void csi_at(int currcons, unsigned int nr)
     /*  */
 844 {
 845         if (nr > video_num_columns)
 846                 nr = video_num_columns;
 847         else if (!nr)
 848                 nr = 1;
 849         while (nr--)
 850                 insert_char(currcons);
 851 }
 852 
 853 static void csi_L(int currcons, unsigned int nr)
     /*  */
 854 {
 855         if (nr > video_num_lines)
 856                 nr = video_num_lines;
 857         else if (!nr)
 858                 nr = 1;
 859         while (nr--)
 860                 insert_line(currcons);
 861 }
 862 
 863 static void csi_P(int currcons, unsigned int nr)
     /*  */
 864 {
 865         if (nr > video_num_columns)
 866                 nr = video_num_columns;
 867         else if (!nr)
 868                 nr = 1;
 869         while (nr--)
 870                 delete_char(currcons);
 871 }
 872 
 873 static void csi_M(int currcons, unsigned int nr)
     /*  */
 874 {
 875         if (nr > video_num_lines)
 876                 nr = video_num_lines;
 877         else if (!nr)
 878                 nr=1;
 879         while (nr--)
 880                 delete_line(currcons);
 881 }
 882 
 883 static void save_cur(int currcons)
     /*  */
 884 {
 885         saved_x         = x;
 886         saved_y         = y;
 887         s_intensity     = intensity;
 888         s_underline     = underline;
 889         s_blink         = blink;
 890         s_reverse       = reverse;
 891         s_charset       = charset;
 892         s_color         = color;
 893         saved_G0        = G0_charset;
 894         saved_G1        = G1_charset;
 895 }
 896 
 897 static void restore_cur(int currcons)
     /*  */
 898 {
 899         gotoxy(currcons,saved_x,saved_y);
 900         intensity       = s_intensity;
 901         underline       = s_underline;
 902         blink           = s_blink;
 903         reverse         = s_reverse;
 904         charset         = s_charset;
 905         color           = s_color;
 906         G0_charset      = saved_G0;
 907         G1_charset      = saved_G1;
 908         translate       = charset ? G1_charset : G0_charset;
 909         update_attr(currcons);
 910         need_wrap = 0;
 911 }
 912 
 913 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey, 
 914         EShash, ESsetG0, ESsetG1, ESignore };
 915 
 916 static void reset_terminal(int currcons, int do_clear)
     /*  */
 917 {
 918         top             = 0;
 919         bottom          = video_num_lines;
 920         state           = ESnormal;
 921         ques            = 0;
 922         translate       = NORM_TRANS;
 923         G0_charset      = NORM_TRANS;
 924         G1_charset      = GRAF_TRANS;
 925         charset         = 0;
 926         need_wrap       = 0;
 927 
 928         decscnm         = 0;
 929         decom           = 0;
 930         decawm          = 1;
 931         deccm           = 1;
 932         decim           = 0;
 933 
 934         set_kbd(decarm);
 935         clr_kbd(decckm);
 936         clr_kbd(kbdapplic);
 937         clr_kbd(lnm);
 938         kbd_table[currcons].flags =
 939                 (kbd_table[currcons].flags & ~LED_MASK) |
 940                 (kbd_table[currcons].default_flags & LED_MASK);
 941         kbdmode         = 0;
 942         set_leds();
 943 
 944         default_attr(currcons);
 945         update_attr(currcons);
 946 
 947         tab_stop[0]     = 0x01010100;
 948         tab_stop[1]     =
 949         tab_stop[2]     =
 950         tab_stop[3]     =
 951         tab_stop[4]     = 0x01010101;
 952 
 953         if (do_clear) {
 954                 gotoxy(currcons,0,0);
 955                 csi_J(currcons,2);
 956                 save_cur(currcons);
 957         }
 958 }
 959 
 960 void con_write(struct tty_struct * tty)
     /*  */
 961 {
 962         int c;
 963         unsigned int currcons;
 964 
 965         wake_up_interruptible(&tty->write_q.proc_list);
 966         currcons = tty->line - 1;
 967         if (currcons >= NR_CONSOLES) {
 968                 printk("con_write: illegal tty (%d)\n", currcons);
 969                 return;
 970         }
 971 #ifdef CONFIG_SELECTION
 972         /* clear the selection as soon as any characters are to be written
 973            out on the console holding the selection. */
 974         if (!EMPTY(&tty->write_q) && currcons == sel_cons)
 975                 clear_selection();
 976 #endif /* CONFIG_SELECTION */
 977         disable_bh(KEYBOARD_BH);
 978         while (!tty->stopped && (c = get_tty_queue(&tty->write_q)) >= 0) {
 979                 if (state == ESnormal && translate[c]) {
 980                         if (need_wrap) {
 981                                 cr(currcons);
 982                                 lf(currcons);
 983                         }
 984                         if (decim)
 985                                 insert_char(currcons);
 986                         c = translate[c];
 987                         *(unsigned short *) pos = (attr << 8) + c;
 988                         if (x == video_num_columns - 1)
 989                                 need_wrap = decawm;
 990                         else {
 991                                 x++;
 992                                 pos+=2;
 993                         }
 994                         continue;
 995                 }
 996 
 997                 /*
 998                  *  Control characters can be used in the _middle_
 999                  *  of an escape sequence.
1000                  */
1001                 switch (c) {
1002                         case 7:
1003                                 kd_mksound(0x637, HZ/8);
1004                                 continue;
1005                         case 8:
1006                                 bs(currcons);
1007                                 continue;
1008                         case 9:
1009                                 pos -= (x << 1);
1010                                 while (x < video_num_columns - 1) {
1011                                         x++;
1012                                         if (tab_stop[x >> 5] & (1 << (x & 31)))
1013                                                 break;
1014                                 }
1015                                 pos += (x << 1);
1016                                 continue;
1017                         case 10: case 11: case 12:
1018                                 lf(currcons);
1019                                 if (!is_kbd(lnm))
1020                                         continue;
1021                         case 13:
1022                                 cr(currcons);
1023                                 continue;
1024                         case 14:
1025                                 charset = 1;
1026                                 translate = G1_charset;
1027                                 continue;
1028                         case 15:
1029                                 charset = 0;
1030                                 translate = G0_charset;
1031                                 continue;
1032                         case 24: case 26:
1033                                 state = ESnormal;
1034                                 continue;
1035                         case 27:
1036                                 state = ESesc;
1037                                 continue;
1038                         case 127:
1039                                 del(currcons);
1040                                 continue;
1041                         case 128+27:
1042                                 state = ESsquare;
1043                                 continue;
1044                 }
1045                 switch(state) {
1046                         case ESesc:
1047                                 state = ESnormal;
1048                                 switch (c) {
1049                                   case '[':
1050                                         state = ESsquare;
1051                                         continue;
1052                                   case 'E':
1053                                         cr(currcons);
1054                                         lf(currcons);
1055                                         continue;
1056                                   case 'M':
1057                                         ri(currcons);
1058                                         continue;
1059                                   case 'D':
1060                                         lf(currcons);
1061                                         continue;
1062                                   case 'H':
1063                                         tab_stop[x >> 5] |= (1 << (x & 31));
1064                                         continue;
1065                                   case 'Z':
1066                                         respond_ID(currcons,tty);
1067                                         continue;
1068                                   case '7':
1069                                         save_cur(currcons);
1070                                         continue;
1071                                   case '8':
1072                                         restore_cur(currcons);
1073                                         continue;
1074                                   case '(':
1075                                         state = ESsetG0;
1076                                         continue;
1077                                   case ')':
1078                                         state = ESsetG1;
1079                                         continue;
1080                                   case '#':
1081                                         state = EShash;
1082                                         continue;
1083                                   case 'c':
1084                                         reset_terminal(currcons,1);
1085                                         continue;
1086                                   case '>':  /* Numeric keypad */
1087                                         clr_kbd(kbdapplic);
1088                                         continue;
1089                                   case '=':  /* Appl. keypad */
1090                                         set_kbd(kbdapplic);
1091                                         continue;
1092                                 }       
1093                                 continue;
1094                         case ESsquare:
1095                                 for(npar = 0 ; npar < NPAR ; npar++)
1096                                         par[npar] = 0;
1097                                 npar = 0;
1098                                 state = ESgetpars;
1099                                 if (c == '[') { /* Function key */
1100                                         state=ESfunckey;
1101                                         continue;
1102                                 }
1103                                 ques = (c=='?');
1104                                 if (ques)
1105                                         continue;
1106                         case ESgetpars:
1107                                 if (c==';' && npar<NPAR-1) {
1108                                         npar++;
1109                                         continue;
1110                                 } else if (c>='0' && c<='9') {
1111                                         par[npar] *= 10;
1112                                         par[npar] += c-'0';
1113                                         continue;
1114                                 } else state=ESgotpars;
1115                         case ESgotpars:
1116                                 state = ESnormal;
1117                                 switch(c) {
1118                                         case 'h':
1119                                                 set_mode(currcons,1);
1120                                                 continue;
1121                                         case 'l':
1122                                                 set_mode(currcons,0);
1123                                                 continue;
1124                                         case 'n':
1125                                                 if (!ques)
1126                                                         if (par[0] == 5)
1127                                                                 status_report(currcons,tty);
1128                                                         else if (par[0] == 6)
1129                                                                 cursor_report(currcons,tty);
1130                                                 continue;
1131                                 }
1132                                 if (ques) {
1133                                         ques = 0;
1134                                         continue;
1135                                 }
1136                                 switch(c) {
1137                                         case 'G': case '`':
1138                                                 if (par[0]) par[0]--;
1139                                                 gotoxy(currcons,par[0],y);
1140                                                 continue;
1141                                         case 'A':
1142                                                 if (!par[0]) par[0]++;
1143                                                 gotoxy(currcons,x,y-par[0]);
1144                                                 continue;
1145                                         case 'B': case 'e':
1146                                                 if (!par[0]) par[0]++;
1147                                                 gotoxy(currcons,x,y+par[0]);
1148                                                 continue;
1149                                         case 'C': case 'a':
1150                                                 if (!par[0]) par[0]++;
1151                                                 gotoxy(currcons,x+par[0],y);
1152                                                 continue;
1153                                         case 'D':
1154                                                 if (!par[0]) par[0]++;
1155                                                 gotoxy(currcons,x-par[0],y);
1156                                                 continue;
1157                                         case 'E':
1158                                                 if (!par[0]) par[0]++;
1159                                                 gotoxy(currcons,0,y+par[0]);
1160                                                 continue;
1161                                         case 'F':
1162                                                 if (!par[0]) par[0]++;
1163                                                 gotoxy(currcons,0,y-par[0]);
1164                                                 continue;
1165                                         case 'd':
1166                                                 if (par[0]) par[0]--;
1167                                                 gotoxy(currcons,x,par[0]);
1168                                                 continue;
1169                                         case 'H': case 'f':
1170                                                 if (par[0]) par[0]--;
1171                                                 if (par[1]) par[1]--;
1172                                                 gotoxy(currcons,par[1],par[0]);
1173                                                 continue;
1174                                         case 'J':
1175                                                 csi_J(currcons,par[0]);
1176                                                 continue;
1177                                         case 'K':
1178                                                 csi_K(currcons,par[0]);
1179                                                 continue;
1180                                         case 'L':
1181                                                 csi_L(currcons,par[0]);
1182                                                 continue;
1183                                         case 'M':
1184                                                 csi_M(currcons,par[0]);
1185                                                 continue;
1186                                         case 'P':
1187                                                 csi_P(currcons,par[0]);
1188                                                 continue;
1189                                         case 'c':
1190                                                 if (!par[0])
1191                                                         respond_ID(currcons,tty);
1192                                                 continue;
1193                                         case 'g':
1194                                                 if (!par[0])
1195                                                         tab_stop[x >> 5] &= ~(1 << (x & 31));
1196                                                 else if (par[0] == 3) {
1197                                                         tab_stop[0] =
1198                                                         tab_stop[1] =
1199                                                         tab_stop[2] =
1200                                                         tab_stop[3] =
1201                                                         tab_stop[4] = 0;
1202                                                 }
1203                                                 continue;
1204                                         case 'm':
1205                                                 csi_m(currcons);
1206                                                 continue;
1207                                         case 'r':
1208                                                 if (!par[0])
1209                                                         par[0]++;
1210                                                 if (!par[1])
1211                                                         par[1] = video_num_lines;
1212                                                 /* Minimum allowed region is 2 lines */
1213                                                 if (par[0] < par[1] &&
1214                                                     par[1] <= video_num_lines) {
1215                                                         top=par[0]-1;
1216                                                         bottom=par[1];
1217                                                         gotoxy(currcons,0,0);
1218                                                 }
1219                                                 continue;
1220                                         case 's':
1221                                                 save_cur(currcons);
1222                                                 continue;
1223                                         case 'u':
1224                                                 restore_cur(currcons);
1225                                                 continue;
1226                                         case '@':
1227                                                 csi_at(currcons,par[0]);
1228                                                 continue;
1229                                         case ']': /* setterm functions */
1230                                                 setterm_command(currcons);
1231                                                 continue;
1232                                 }
1233                                 continue;
1234                         case ESfunckey:
1235                                 state = ESnormal;
1236                                 continue;
1237                         case EShash:
1238                                 state = ESnormal;
1239                                 if (c == '8') {
1240                                         /* DEC screen alignment test. kludge :-) */
1241                                         video_erase_char =
1242                                                 (video_erase_char & 0xff00) | 'E';
1243                                         csi_J(currcons, 2);
1244                                         video_erase_char =
1245                                                 (video_erase_char & 0xff00) | ' ';
1246                                 }
1247                                 continue;
1248                         case ESsetG0:
1249                                 if (c == '0')
1250                                         G0_charset = GRAF_TRANS;
1251                                 else if (c == 'B')
1252                                         G0_charset = NORM_TRANS;
1253                                 else if (c == 'U')
1254                                         G0_charset = NULL_TRANS;
1255                                 if (charset == 0)
1256                                         translate = G0_charset;
1257                                 state = ESnormal;
1258                                 continue;
1259                         case ESsetG1:
1260                                 if (c == '0')
1261                                         G1_charset = GRAF_TRANS;
1262                                 else if (c == 'B')
1263                                         G1_charset = NORM_TRANS;
1264                                 else if (c == 'U')
1265                                         G1_charset = NULL_TRANS;
1266                                 if (charset == 1)
1267                                         translate = G1_charset;
1268                                 state = ESnormal;
1269                                 continue;
1270                         default:
1271                                 state = ESnormal;
1272                 }
1273         }
1274         if (vcmode != KD_GRAPHICS)
1275                 set_cursor(currcons);
1276         enable_bh(KEYBOARD_BH);
1277 }
1278 
1279 void do_keyboard_interrupt(void)
     /*  */
1280 {
1281         TTY_READ_FLUSH(TTY_TABLE(0));
1282         timer_active &= ~(1<<BLANK_TIMER);
1283         if (vt_cons[fg_console].vc_mode == KD_GRAPHICS)
1284                 return;
1285         if (console_blanked) {
1286                 timer_table[BLANK_TIMER].expires = 0;
1287                 timer_active |= 1<<BLANK_TIMER;
1288         } else if (blankinterval) {
1289                 timer_table[BLANK_TIMER].expires = jiffies + blankinterval;
1290                 timer_active |= 1<<BLANK_TIMER;
1291         }
1292 }
1293 
1294 void * memsetw(void * s,unsigned short c,int count)
     /*  */
1295 {
1296 __asm__("cld\n\t"
1297         "rep\n\t"
1298         "stosw"
1299         : /* no output */
1300         :"a" (c),"D" (s),"c" (count)
1301         :"cx","di");
1302 return s;
1303 }
1304 
1305 void console_print(const char * b)
     /*  */
1306 {
1307         int currcons = fg_console;
1308         unsigned char c;
1309 
1310         if (!printable || currcons<0 || currcons>=NR_CONSOLES)
1311                 return;
1312         while ((c = *(b++)) != 0) {
1313                 if (c == 10 || c == 13 || need_wrap) {
1314                         if (c != 13)
1315                                 lf(currcons);
1316                         cr(currcons);
1317                         if (c == 10 || c == 13)
1318                                 continue;
1319                 }
1320                 *(unsigned short *) pos = (attr << 8) + c;
1321                 if (x == video_num_columns - 1) {
1322                         need_wrap = 1;
1323                         continue;
1324                 }
1325                 x++;
1326                 pos+=2;
1327         }
1328         set_cursor(currcons);
1329         if (vt_cons[fg_console].vc_mode == KD_GRAPHICS)
1330                 return;
1331         timer_active &= ~(1<<BLANK_TIMER);
1332         if (console_blanked) {
1333                 timer_table[BLANK_TIMER].expires = 0;
1334                 timer_active |= 1<<BLANK_TIMER;
1335         } else if (blankinterval) {
1336                 timer_table[BLANK_TIMER].expires = jiffies + blankinterval;
1337                 timer_active |= 1<<BLANK_TIMER;
1338         }
1339 }
1340 
1341 /*
1342  *  long con_init(long);
1343  *
1344  * This routine initalizes console interrupts, and does nothing
1345  * else. If you want the screen to clear, call tty_write with
1346  * the appropriate escape-sequece.
1347  *
1348  * Reads the information preserved by setup.s to determine the current display
1349  * type and sets everything accordingly.
1350  */
1351 long con_init(long kmem_start)
     /*  */
1352 {
1353         char *display_desc = "????";
1354         int currcons = 0;
1355         long base;
1356         int orig_x = ORIG_X;
1357         int orig_y = ORIG_Y;
1358 
1359         vc_scrmembuf = (unsigned short *) kmem_start;
1360         video_num_columns = ORIG_VIDEO_COLS;
1361         video_size_row = video_num_columns * 2;
1362         video_num_lines = ORIG_VIDEO_LINES;
1363         video_page = ORIG_VIDEO_PAGE;
1364         screen_size = (video_num_lines * video_size_row);
1365         kmem_start += NR_CONSOLES * screen_size;
1366         timer_table[BLANK_TIMER].fn = blank_screen;
1367         timer_table[BLANK_TIMER].expires = 0;
1368         if (blankinterval) {
1369                 timer_table[BLANK_TIMER].expires = jiffies+blankinterval;
1370                 timer_active |= 1<<BLANK_TIMER;
1371         }
1372         
1373         if (ORIG_VIDEO_MODE == 7)       /* Is this a monochrome display? */
1374         {
1375                 video_mem_base = 0xb0000;
1376                 video_port_reg = 0x3b4;
1377                 video_port_val = 0x3b5;
1378                 if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10)
1379                 {
1380                         video_type = VIDEO_TYPE_EGAM;
1381                         video_mem_term = 0xb8000;
1382                         display_desc = "EGA+";
1383                 }
1384                 else
1385                 {
1386                         video_type = VIDEO_TYPE_MDA;
1387                         video_mem_term = 0xb2000;
1388                         display_desc = "*MDA";
1389                 }
1390         }
1391         else                            /* If not, it is color. */
1392         {
1393                 can_do_color = 1;
1394                 video_mem_base = 0xb8000;
1395                 video_port_reg  = 0x3d4;
1396                 video_port_val  = 0x3d5;
1397                 if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10)
1398                 {
1399                         video_type = VIDEO_TYPE_EGAC;
1400                         video_mem_term = 0xc0000;
1401                         display_desc = "EGA+";
1402                 }
1403                 else
1404                 {
1405                         video_type = VIDEO_TYPE_CGA;
1406                         video_mem_term = 0xba000;
1407                         display_desc = "*CGA";
1408                 }
1409         }
1410         
1411         /* Initialize the variables used for scrolling (mostly EGA/VGA) */
1412 
1413         base = (long)vc_scrmembuf;
1414         for (currcons = 0; currcons<NR_CONSOLES; currcons++) {
1415                 pos = origin = video_mem_start = base;
1416                 scr_end = video_mem_end = (base += screen_size);
1417                 vc_scrbuf[currcons] = (unsigned short *) origin;
1418                 vcmode          = KD_TEXT;
1419                 vtmode.mode     = VT_AUTO;
1420                 vtmode.waitv    = 0;
1421                 vtmode.relsig   = 0;
1422                 vtmode.acqsig   = 0;
1423                 vtmode.frsig    = 0;
1424                 vtpid           = -1;
1425                 vtnewvt         = -1;
1426                 clr_kbd(kbdraw);
1427                 def_color       = 0x07;   /* white */
1428                 ulcolor         = 0x0f;   /* bold white */
1429                 halfcolor       = 0x08;   /* grey */
1430                 reset_terminal(currcons, currcons);
1431         }
1432         currcons = fg_console = 0;
1433 
1434         video_mem_start = video_mem_base;
1435         video_mem_end = video_mem_term;
1436         origin = video_mem_start;
1437         scr_end = video_mem_start + video_num_lines * video_size_row;
1438         gotoxy(currcons,0,0);
1439         save_cur(currcons);
1440         gotoxy(currcons,orig_x,orig_y);
1441         update_screen(fg_console);
1442         printable = 1;
1443         printk("Console: %s %s %ldx%ld, %d virtual consoles\n",
1444                 can_do_color?"colour":"mono",
1445                 display_desc,
1446                 video_num_columns,video_num_lines,
1447                 NR_CONSOLES);
1448         register_console(console_print);
1449         return kmem_start;
1450 }
1451 
1452 /*
1453  * kbdsave doesn't need to do anything: it's all handled automatically
1454  * with the new data structures..
1455  */
1456 void kbdsave(int new_console)
     /*  */
1457 {
1458 }
1459 
1460 static void get_scrmem(int currcons)
     /*  */
1461 {
1462         memcpy((void *)vc_scrbuf[currcons],(void *)origin, screen_size);
1463         video_mem_start = (unsigned long)vc_scrbuf[currcons];
1464         origin  = video_mem_start;
1465         scr_end = video_mem_end = video_mem_start+screen_size;
1466         pos = origin + y*video_size_row + (x<<1);
1467 }
1468 
1469 static void set_scrmem(int currcons)
     /*  */
1470 {
1471         video_mem_start = video_mem_base;
1472         video_mem_end = video_mem_term;
1473         origin  = video_mem_start;
1474         scr_end = video_mem_start + screen_size;
1475         pos = origin + y*video_size_row + (x<<1);
1476         memcpy((void *)video_mem_base, (void *)vc_scrbuf[fg_console], screen_size);
1477 }
1478 
1479 void blank_screen(void)
     /*  */
1480 {
1481         if (console_blanked)
1482                 return;
1483         timer_table[BLANK_TIMER].fn = unblank_screen;
1484         get_scrmem(fg_console);
1485         hide_cursor(fg_console);
1486         console_blanked = 1;
1487         memsetw((void *)video_mem_base, 0x0020, video_mem_term-video_mem_base );
1488 }
1489 
1490 void unblank_screen(void)
     /*  */
1491 {
1492         if (!console_blanked)
1493                 return;
1494         timer_table[BLANK_TIMER].fn = blank_screen;
1495         if (blankinterval) {
1496                 timer_table[BLANK_TIMER].expires = jiffies + blankinterval;
1497                 timer_active |= 1<<BLANK_TIMER;
1498         }
1499         console_blanked = 0;
1500         set_scrmem(fg_console);
1501         set_origin(fg_console);
1502         set_cursor(fg_console);
1503 }
1504 
1505 void update_screen(int new_console)
     /*  */
1506 {
1507         static int lock = 0;
1508 
1509         if (new_console == fg_console || lock)
1510                 return;
1511         lock = 1;
1512         kbdsave(new_console);
1513         get_scrmem(fg_console); 
1514         fg_console = new_console;
1515         set_scrmem(fg_console); 
1516         set_origin(fg_console);
1517         set_cursor(new_console);
1518         set_leds();
1519         lock = 0;
1520 }
1521 
1522 int do_screendump(int arg)
     /*  */
1523 {
1524         char *sptr, *buf = (char *)arg;
1525         int currcons, l;
1526 
1527         if (!suser())
1528                 return -EPERM;
1529         l = verify_area(VERIFY_WRITE, buf,2+video_num_columns*video_num_lines);
1530         if (l)
1531                 return l;
1532         currcons = get_fs_byte(buf+1);
1533         if ((currcons<0) || (currcons>NR_CONSOLES))
1534                 return -EIO;
1535         put_fs_byte((char)(video_num_lines),buf++);     
1536         put_fs_byte((char)(video_num_columns),buf++);
1537         currcons = (currcons ? currcons-1 : fg_console);
1538         sptr = (char *) origin;
1539         for (l=video_num_lines*video_num_columns; l>0 ; l--, sptr++)
1540                 put_fs_byte(*sptr++,buf++);     
1541         return(0);
1542 }
1543 
1544 /*
1545  * All we do is set the write and ioctl subroutines; later on maybe we'll
1546  * dynamically allocate the console screen memory.
1547  */
1548 int con_open(struct tty_struct *tty, struct file * filp)
     /*  */
1549 {
1550         tty->write = con_write;
1551         tty->ioctl = vt_ioctl;
1552         if (tty->line > NR_CONSOLES)
1553                 return -ENODEV;
1554         return 0;
1555 }
1556 
1557 #ifdef CONFIG_SELECTION
1558 /* correction factor for when screen is hardware-scrolled */
1559 #define hwscroll_offset (currcons == fg_console ? ((__real_origin - __origin) << 1) : 0)
1560 
1561 /* set reverse video on characters s-e of console with selection. */
1562 static void highlight(const int currcons, const int s, const int e)
     /*  */
1563 {
1564         unsigned char *p, *p1, *p2;
1565 
1566         p1 = (unsigned char *)origin - hwscroll_offset + s + 1;
1567         p2 = (unsigned char *)origin - hwscroll_offset + e + 1;
1568         if (p1 > p2)
1569         {
1570                 p = p1;
1571                 p1 = p2;
1572                 p2 = p;
1573         }
1574         for (p = p1; p <= p2; p += 2)
1575                 *p = (*p & 0x88) | ((*p << 4) & 0x70) | ((*p >> 4) & 0x07);
1576 }
1577 
1578 /* is c in range [a-zA-Z0-9_]? */
1579 static inline int inword(const char c) { return (isalnum(c) || c == '_'); }
     /*  */
1580 
1581 /* does screen address p correspond to character at LH/RH edge of screen? */
1582 static inline int atedge(const int p)
     /*  */
1583 {
1584         return (!(p % video_size_row) || !((p + 2) % video_size_row));
1585 }
1586 
1587 /* constrain v such that l <= v <= u */
1588 static inline short limit(const int v, const int l, const int u)
     /*  */
1589 {
1590         return (v < l) ? l : ((v > u) ? u : v);
1591 }
1592 
1593 /* set the current selection. Invoked by ioctl(). */
1594 int set_selection(const int arg)
     /*  */
1595 {
1596         unsigned short *args, xs, ys, xe, ye;
1597         int currcons = fg_console;
1598         int sel_mode, new_sel_start, new_sel_end, spc;
1599         char *bp, *obp, *spos;
1600         int i, ps, pe;
1601         char *off = (char *)origin - hwscroll_offset;
1602 
1603         unblank_screen();
1604         args = (unsigned short *)(arg + 1);
1605         xs = get_fs_word(args++) - 1;
1606         ys = get_fs_word(args++) - 1;
1607         xe = get_fs_word(args++) - 1;
1608         ye = get_fs_word(args++) - 1;
1609         sel_mode = get_fs_word(args);
1610 
1611         xs = limit(xs, 0, video_num_columns - 1);
1612         ys = limit(ys, 0, video_num_lines - 1);
1613         xe = limit(xe, 0, video_num_columns - 1);
1614         ye = limit(ye, 0, video_num_lines - 1);
1615         ps = ys * video_size_row + (xs << 1);
1616         pe = ye * video_size_row + (xe << 1);
1617 
1618         if (ps > pe)    /* make sel_start <= sel_end */
1619         {
1620                 int tmp = ps;
1621                 ps = pe;
1622                 pe = tmp;
1623         }
1624 
1625         switch (sel_mode)
1626         {
1627                 case 0: /* character-by-character selection */
1628                 default:
1629                         new_sel_start = ps;
1630                         new_sel_end = pe;
1631                         break;
1632                 case 1: /* word-by-word selection */
1633                         spc = isspace(*(off + ps));
1634                         for (new_sel_start = ps; ; ps -= 2)
1635                         {
1636                                 if ((spc && !isspace(*(off + ps))) ||
1637                                     (!spc && !inword(*(off + ps))))
1638                                         break;
1639                                 new_sel_start = ps;
1640                                 if (!(ps % video_size_row))
1641                                         break;
1642                         }
1643                         spc = isspace(*(off + pe));
1644                         for (new_sel_end = pe; ; pe += 2)
1645                         {
1646                                 if ((spc && !isspace(*(off + pe))) ||
1647                                     (!spc && !inword(*(off + pe))))
1648                                         break;
1649                                 new_sel_end = pe;
1650                                 if (!((pe + 2) % video_size_row))
1651                                         break;
1652                         }
1653                         break;
1654                 case 2: /* line-by-line selection */
1655                         new_sel_start = ps - ps % video_size_row;
1656                         new_sel_end = pe + video_size_row
1657                                     - pe % video_size_row - 2;
1658                         break;
1659         }
1660         /* select to end of line if on trailing space */
1661         if (new_sel_end > new_sel_start &&
1662                 !atedge(new_sel_end) && isspace(*(off + new_sel_end)))
1663         {
1664                 for (pe = new_sel_end + 2; ; pe += 2)
1665                 {
1666                         if (!isspace(*(off + pe)) || atedge(pe))
1667                                 break;
1668                 }
1669                 if (isspace(*(off + pe)))
1670                         new_sel_end = pe;
1671         }
1672         if (sel_cons != currcons)
1673         {
1674                 clear_selection();
1675                 sel_cons = currcons;
1676         }
1677         if (sel_start == -1)    /* no current selection */
1678                 highlight(sel_cons, new_sel_start, new_sel_end);
1679         else if (new_sel_start == sel_start)
1680         {
1681                 if (new_sel_end == sel_end)     /* no action required */
1682                         return 0;
1683                 else if (new_sel_end > sel_end) /* extend to right */
1684                         highlight(sel_cons, sel_end + 2, new_sel_end);
1685                 else                            /* contract from right */
1686                         highlight(sel_cons, new_sel_end + 2, sel_end);
1687         }
1688         else if (new_sel_end == sel_end)
1689         {
1690                 if (new_sel_start < sel_start)  /* extend to left */
1691                         highlight(sel_cons, new_sel_start, sel_start - 2);
1692                 else                            /* contract from left */
1693                         highlight(sel_cons, sel_start, new_sel_start - 2);
1694         }
1695         else    /* some other case; start selection from scratch */
1696         {
1697                 clear_selection();
1698                 highlight(sel_cons, new_sel_start, new_sel_end);
1699         }
1700         sel_start = new_sel_start;
1701         sel_end = new_sel_end;
1702         obp = bp = sel_buffer;
1703         for (i = sel_start; i <= sel_end; i += 2)
1704         {
1705                 spos = (char *)off + i;
1706                 *bp++ = *spos;
1707                 if (!isspace(*spos))
1708                         obp = bp;
1709                 if (! ((i + 2) % video_size_row))
1710                 {
1711                         /* strip trailing blanks from line and add newline,
1712                            unless non-space at end of line. */
1713                         if (obp != bp)
1714                         {
1715                                 bp = obp;
1716                                 *bp++ = '\r';
1717                         }
1718                         obp = bp;
1719                 }
1720                 /* check for space, leaving room for next character, possible
1721                    newline, and null at end. */
1722                 if (bp - sel_buffer > SEL_BUFFER_SIZE - 3)
1723                         break;
1724         }
1725         *bp = '\0';
1726         return 0;
1727 }
1728 
1729 /* insert the contents of the selection buffer into the queue of the
1730    tty associated with the current console. Invoked by ioctl(). */
1731 int paste_selection(struct tty_struct *tty)
     /*  */
1732 {
1733         char *bp = sel_buffer;
1734 
1735         if (! *bp)
1736                 return 0;
1737         unblank_screen();
1738         while (*bp)
1739         {
1740                 put_tty_queue(*bp, &tty->read_q);
1741                 bp++;
1742         }
1743         TTY_READ_FLUSH(tty);
1744         return 0;
1745 }
1746 
1747 /* remove the current selection highlight, if any, from the console holding
1748    the selection. */
1749 static void clear_selection()
     /*  */
1750 {
1751         if (sel_start != -1)
1752         {
1753                 highlight(sel_cons, sel_start, sel_end);
1754                 sel_start = -1;
1755         }
1756 }
1757 #endif /* CONFIG_SELECTION */
/* */
root/drivers/char/console.c

DEFINITIONS
