kernel/chr_drv/console.c

/* */
This source file includes following definitions.
gotoxy
set_origin
scrup
scrdown
lf
ri
cr
bs
del
csi_J
csi_K
update_attr
default_attr
csi_m
hide_cursor
set_cursor
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
con_init
kbdsave
get_scrmem
set_scrmem
blank_screen
unblank_screen
update_screen
sysbeepstop
sysbeep
do_screendump
console_print
con_open
   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 
  26 /*
  27  *  NOTE!!! We sometimes disable and enable interrupts for a short while
  28  * (to put a word in video IO), but this will work even for keyboard
  29  * interrupts. We know interrupts aren't enabled when getting a keyboard
  30  * interrupt, as we use trap-gates. Hopefully all is well.
  31  */
  32 
  33 /*
  34  * Code to check for different video-cards mostly by Galen Hunt,
  35  * <g-hunt@ee.utah.edu>
  36  */
  37 
  38 #include <linux/sched.h>
  39 #include <linux/timer.h>
  40 #include <linux/tty.h>
  41 #include <linux/config.h>
  42 #include <linux/kernel.h>
  43 #include <linux/string.h>
  44 #include <linux/errno.h>
  45 #include <linux/kd.h>
  46 #include <linux/keyboard.h>
  47 
  48 #include <asm/io.h>
  49 #include <asm/system.h>
  50 #include <asm/segment.h>
  51 
  52 #include "vt_kern.h"
  53 
  54 #define NPAR 16
  55 
  56 extern void vt_init(void);
  57 
  58 unsigned long   video_num_columns;              /* Number of text columns       */
  59 unsigned long   video_num_lines;                /* Number of test lines         */
  60 
  61 static unsigned char    video_type;             /* Type of display being used   */
  62 static unsigned long    video_mem_base;         /* Base of video memory         */
  63 static unsigned long    video_mem_term;         /* End of video memory          */
  64 static unsigned long    video_size_row;         /* Bytes per row                */
  65 static unsigned char    video_page;             /* Initial video page           */
  66 static unsigned short   video_port_reg;         /* Video register select port   */
  67 static unsigned short   video_port_val;         /* Video register value port    */
  68 static int can_do_color = 0;
  69 static int printable = 0;
  70 
  71 static struct {
  72         unsigned short  vc_video_erase_char;    /* Background erase character */
  73         unsigned char   vc_attr;                /* Current attributes */
  74         unsigned char   vc_def_color;           /* Default colors */
  75         unsigned char   vc_color;               /* Foreground & background */
  76         unsigned char   vc_s_color;             /* Saved foreground & background */
  77         unsigned char   vc_ulcolor;             /* Colour for underline mode */
  78         unsigned char   vc_halfcolor;           /* Colour for half intensity mode */
  79         unsigned long   vc_origin;              /* Used for EGA/VGA fast scroll */
  80         unsigned long   vc_scr_end;             /* Used for EGA/VGA fast scroll */
  81         unsigned long   vc_pos;
  82         unsigned long   vc_x,vc_y;
  83         unsigned long   vc_top,vc_bottom;
  84         unsigned long   vc_state;
  85         unsigned long   vc_npar,vc_par[NPAR];
  86         unsigned long   vc_video_mem_start;     /* Start of video RAM           */
  87         unsigned long   vc_video_mem_end;       /* End of video RAM (sort of)   */
  88         unsigned long   vc_saved_x;
  89         unsigned long   vc_saved_y;
  90         /* mode flags */
  91         unsigned long   vc_charset      : 1;    /* Character set G0 / G1 */
  92         unsigned long   vc_s_charset    : 1;    /* Saved character set */
  93         unsigned long   vc_decscnm      : 1;    /* Screen Mode */
  94         unsigned long   vc_decom        : 1;    /* Origin Mode */
  95         unsigned long   vc_decawm       : 1;    /* Autowrap Mode */
  96         unsigned long   vc_deccm        : 1;    /* Cursor Visible */
  97         unsigned long   vc_decim        : 1;    /* Insert Mode */
  98         /* attribute flags */
  99         unsigned long   vc_intensity    : 2;    /* 0=half-bright, 1=normal, 2=bold */
 100         unsigned long   vc_underline    : 1;
 101         unsigned long   vc_blink        : 1;
 102         unsigned long   vc_reverse      : 1;
 103         unsigned long   vc_s_intensity  : 2;    /* saved rendition */
 104         unsigned long   vc_s_underline  : 1;
 105         unsigned long   vc_s_blink      : 1;
 106         unsigned long   vc_s_reverse    : 1;
 107         /* misc */
 108         unsigned long   vc_ques         : 1;
 109         unsigned long   vc_need_wrap    : 1;
 110         unsigned long   vc_tab_stop[5];         /* Tab stops. 160 columns. */
 111         unsigned char   vc_kbdmode;
 112         char *          vc_translate;
 113         char *          vc_G0_charset;
 114         char *          vc_G1_charset;
 115         char *          vc_saved_G0;
 116         char *          vc_saved_G1;
 117         /* additional information is in vt_kern.h */
 118 } vc_cons [NR_CONSOLES];
 119 
 120 #define MEM_BUFFER_SIZE (2*80*50*8) 
 121 
 122 unsigned short *vc_scrbuf[NR_CONSOLES];
 123 static unsigned short * vc_scrmembuf;
 124 static int console_blanked = 0;
 125 
 126 #define origin          (vc_cons[currcons].vc_origin)
 127 #define scr_end         (vc_cons[currcons].vc_scr_end)
 128 #define pos             (vc_cons[currcons].vc_pos)
 129 #define top             (vc_cons[currcons].vc_top)
 130 #define bottom          (vc_cons[currcons].vc_bottom)
 131 #define x               (vc_cons[currcons].vc_x)
 132 #define y               (vc_cons[currcons].vc_y)
 133 #define state           (vc_cons[currcons].vc_state)
 134 #define npar            (vc_cons[currcons].vc_npar)
 135 #define par             (vc_cons[currcons].vc_par)
 136 #define ques            (vc_cons[currcons].vc_ques)
 137 #define attr            (vc_cons[currcons].vc_attr)
 138 #define saved_x         (vc_cons[currcons].vc_saved_x)
 139 #define saved_y         (vc_cons[currcons].vc_saved_y)
 140 #define translate       (vc_cons[currcons].vc_translate)
 141 #define G0_charset      (vc_cons[currcons].vc_G0_charset)
 142 #define G1_charset      (vc_cons[currcons].vc_G1_charset)
 143 #define saved_G0        (vc_cons[currcons].vc_saved_G0)
 144 #define saved_G1        (vc_cons[currcons].vc_saved_G1)
 145 #define video_mem_start (vc_cons[currcons].vc_video_mem_start)
 146 #define video_mem_end   (vc_cons[currcons].vc_video_mem_end)
 147 #define video_erase_char (vc_cons[currcons].vc_video_erase_char)        
 148 #define decscnm         (vc_cons[currcons].vc_decscnm)
 149 #define decom           (vc_cons[currcons].vc_decom)
 150 #define decawm          (vc_cons[currcons].vc_decawm)
 151 #define deccm           (vc_cons[currcons].vc_deccm)
 152 #define decim           (vc_cons[currcons].vc_decim)
 153 #define need_wrap       (vc_cons[currcons].vc_need_wrap)
 154 #define color           (vc_cons[currcons].vc_color)
 155 #define s_color         (vc_cons[currcons].vc_s_color)
 156 #define def_color       (vc_cons[currcons].vc_def_color)
 157 #define foreground      (color & 0x0f)
 158 #define background      (color & 0xf0)
 159 #define charset         (vc_cons[currcons].vc_charset)
 160 #define s_charset       (vc_cons[currcons].vc_s_charset)
 161 #define intensity       (vc_cons[currcons].vc_intensity)
 162 #define underline       (vc_cons[currcons].vc_underline)
 163 #define blink           (vc_cons[currcons].vc_blink)
 164 #define reverse         (vc_cons[currcons].vc_reverse)
 165 #define s_intensity     (vc_cons[currcons].vc_s_intensity)
 166 #define s_underline     (vc_cons[currcons].vc_s_underline)
 167 #define s_blink         (vc_cons[currcons].vc_s_blink)
 168 #define s_reverse       (vc_cons[currcons].vc_s_reverse)
 169 #define ulcolor         (vc_cons[currcons].vc_ulcolor)
 170 #define halfcolor       (vc_cons[currcons].vc_halfcolor)
 171 #define kbdmode         (vc_cons[currcons].vc_kbdmode)
 172 #define tab_stop        (vc_cons[currcons].vc_tab_stop)
 173 #define vcmode          (vt_cons[currcons].vc_mode)
 174 #define vtmode          (vt_cons[currcons].vt_mode)
 175 #define vtpid           (vt_cons[currcons].vt_pid)
 176 #define vtnewvt         (vt_cons[currcons].vt_newvt)
 177 
 178 #define set_kbd(x) set_vc_kbd_flag(kbd_table+currcons,x)
 179 #define clr_kbd(x) clr_vc_kbd_flag(kbd_table+currcons,x)
 180 #define is_kbd(x) vc_kbd_flag(kbd_table+currcons,x)
 181 
 182 #define decarm          VC_REPEAT
 183 #define decckm          VC_CKMODE
 184 #define kbdapplic       VC_APPLIC
 185 #define kbdraw          VC_RAW
 186 #define lnm             VC_CRLF
 187 
 188 int blankinterval = 10*60*HZ;
 189 static int screen_size = 0;
 190 
 191 static void sysbeep(void);
 192 
 193 /*
 194  * this is what the terminal answers to a ESC-Z or csi0c query.
 195  */
 196 #define VT100ID "\033[?1;2c"
 197 #define VT102ID "\033[?6c"
 198 
 199 static char * translations[] = {
 200 /* 8-bit Latin-1 mapped to the PC charater set: '\0' means non-printable */
 201         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 202         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 203         " !\"#$%&'()*+,-./0123456789:;<=>?"
 204         "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_"
 205         "`abcdefghijklmnopqrstuvwxyz{|}~\0"
 206         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 207         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 208         "\040\255\233\234\376\235\174\025\376\376\246\256\252\055\376\376"
 209         "\370\361\375\376\376\346\024\371\376\376\247\257\254\253\376\250"
 210         "\376\376\376\376\216\217\222\200\376\220\376\376\376\376\376\376"
 211         "\376\245\376\376\376\376\231\376\376\376\376\376\232\376\376\341"
 212         "\205\240\203\376\204\206\221\207\212\202\210\211\215\241\214\213"
 213         "\376\244\225\242\223\376\224\366\376\227\243\226\201\376\376\230",
 214 /* vt100 graphics */
 215         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 216         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 217         " !\"#$%&'()*+,-./0123456789:;<=>?"
 218         "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^ "
 219         "\004\261\007\007\007\007\370\361\040\007\331\277\332\300\305\007"
 220         "\007\304\007\007\303\264\301\302\263\007\007\007\007\007\234\0"
 221         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 222         "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 223         "\040\255\233\234\376\235\174\025\376\376\246\256\252\055\376\376"
 224         "\370\361\375\376\376\346\024\371\376\376\247\257\254\253\376\250"
 225         "\376\376\376\376\216\217\222\200\376\220\376\376\376\376\376\376"
 226         "\376\245\376\376\376\376\231\376\376\376\376\376\232\376\376\341"
 227         "\205\240\203\376\204\206\221\207\212\202\210\211\215\241\214\213"
 228         "\376\244\225\242\223\376\224\366\376\227\243\226\201\376\376\230",
 229 /* IBM grapgics: minimal translations (CR, LF, LL and ESC) */
 230         "\000\001\002\003\004\005\006\007\010\011\000\013\000\000\016\017"
 231         "\020\021\022\023\024\025\026\027\030\031\032\000\034\035\036\037"
 232         "\040\041\042\043\044\045\046\047\050\051\052\053\054\055\056\057"
 233         "\060\061\062\063\064\065\066\067\070\071\072\073\074\075\076\077"
 234         "\100\101\102\103\104\105\106\107\110\111\112\113\114\115\116\117"
 235         "\120\121\122\123\124\125\126\127\130\131\132\133\134\135\136\137"
 236         "\140\141\142\143\144\145\146\147\150\151\152\153\154\155\156\157"
 237         "\160\161\162\163\164\165\166\167\170\171\172\173\174\175\176\177"
 238         "\200\201\202\203\204\205\206\207\210\211\212\213\214\215\216\217"
 239         "\220\221\222\223\224\225\226\227\230\231\232\233\234\235\236\237"
 240         "\240\241\242\243\244\245\246\247\250\251\252\253\254\255\256\257"
 241         "\260\261\262\263\264\265\266\267\270\271\272\273\274\275\276\277"
 242         "\300\301\302\303\304\305\306\307\310\311\312\313\314\315\316\317"
 243         "\320\321\322\323\324\325\326\327\330\331\332\333\334\335\336\337"
 244         "\340\341\342\343\344\345\346\347\350\351\352\353\354\355\356\357"
 245         "\360\361\362\363\364\365\366\367\370\371\372\373\374\375\376\377"
 246 };
 247 
 248 #define NORM_TRANS (translations[0])
 249 #define GRAF_TRANS (translations[1])
 250 #define NULL_TRANS (translations[2])
 251 
 252 static unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 253                                        8,12,10,14, 9,13,11,15 };
 254 
 255 /*
 256  * gotoxy() must verify all boundaries, because the arguments
 257  * might also be negative. If the given position is out of
 258  * bounds, the cursor is placed at the nearest margin.
 259  */
 260 static void gotoxy(int currcons, int new_x, int new_y)
     /*  */
 261 {
 262         int max_y;
 263 
 264         if (new_x < 0)
 265                 x = 0;
 266         else
 267                 if (new_x >= video_num_columns)
 268                         x = video_num_columns - 1;
 269                 else
 270                         x = new_x;
 271         if (decom) {
 272                 new_y += top;
 273                 max_y = bottom;
 274         } else
 275                 max_y = video_num_lines;
 276         if (new_y < 0)
 277                 y = 0;
 278         else
 279                 if (new_y >= max_y)
 280                         y = max_y - 1;
 281                 else
 282                         y = new_y;
 283         pos = origin + y*video_size_row + (x<<1);
 284         need_wrap = 0;
 285 }
 286 
 287 static void set_origin(int currcons)
     /*  */
 288 {
 289         if (video_type != VIDEO_TYPE_EGAC && video_type != VIDEO_TYPE_EGAM)
 290                 return;
 291         if (currcons != fg_console || console_blanked || vcmode == KD_GRAPHICS)
 292                 return;
 293         cli();
 294         outb_p(12, video_port_reg);
 295         outb_p(0xff&((origin-video_mem_base)>>9), video_port_val);
 296         outb_p(13, video_port_reg);
 297         outb_p(0xff&((origin-video_mem_base)>>1), video_port_val);
 298         sti();
 299 }
 300 
 301 static void scrup(int currcons, unsigned int t, unsigned int b)
     /*  */
 302 {
 303         int hardscroll = 1;
 304 
 305         if (b > video_num_lines || t >= b)
 306                 return;
 307         if (video_type != VIDEO_TYPE_EGAC && video_type != VIDEO_TYPE_EGAM)
 308                 hardscroll = 0;
 309         else if (t || b != video_num_lines)
 310                 hardscroll = 0;
 311         if (hardscroll) {
 312                 origin += video_size_row;
 313                 pos += video_size_row;
 314                 scr_end += video_size_row;
 315                 if (scr_end > video_mem_end) {
 316                         __asm__("cld\n\t"
 317                                 "rep\n\t"
 318                                 "movsl\n\t"
 319                                 "movl _video_num_columns,%1\n\t"
 320                                 "rep\n\t"
 321                                 "stosw"
 322                                 ::"a" (video_erase_char),
 323                                 "c" ((video_num_lines-1)*video_num_columns>>1),
 324                                 "D" (video_mem_start),
 325                                 "S" (origin)
 326                                 :"cx","di","si");
 327                         scr_end -= origin-video_mem_start;
 328                         pos -= origin-video_mem_start;
 329                         origin = video_mem_start;
 330                 } else {
 331                         __asm__("cld\n\t"
 332                                 "rep\n\t"
 333                                 "stosw"
 334                                 ::"a" (video_erase_char),
 335                                 "c" (video_num_columns),
 336                                 "D" (scr_end-video_size_row)
 337                                 :"cx","di");
 338                 }
 339                 set_origin(currcons);
 340         } else {
 341                 __asm__("cld\n\t"
 342                         "rep\n\t"
 343                         "movsl\n\t"
 344                         "movl _video_num_columns,%%ecx\n\t"
 345                         "rep\n\t"
 346                         "stosw"
 347                         ::"a" (video_erase_char),
 348                         "c" ((b-t-1)*video_num_columns>>1),
 349                         "D" (origin+video_size_row*t),
 350                         "S" (origin+video_size_row*(t+1))
 351                         :"cx","di","si");
 352         }
 353 }
 354 
 355 static void scrdown(int currcons, unsigned int t, unsigned int b)
     /*  */
 356 {
 357         if (b > video_num_lines || t >= b)
 358                 return;
 359         __asm__("std\n\t"
 360                 "rep\n\t"
 361                 "movsl\n\t"
 362                 "addl $2,%%edi\n\t"     /* %edi has been decremented by 4 */
 363                 "movl _video_num_columns,%%ecx\n\t"
 364                 "rep\n\t"
 365                 "stosw\n\t"
 366                 "cld"
 367                 ::"a" (video_erase_char),
 368                 "c" ((b-t-1)*video_num_columns>>1),
 369                 "D" (origin+video_size_row*b-4),
 370                 "S" (origin+video_size_row*(b-1)-4)
 371                 :"ax","cx","di","si");
 372 }
 373 
 374 static void lf(int currcons)
     /*  */
 375 {
 376         if (y+1<bottom) {
 377                 y++;
 378                 pos += video_size_row;
 379                 return;
 380         } else 
 381                 scrup(currcons,top,bottom);
 382         need_wrap = 0;
 383 }
 384 
 385 static void ri(int currcons)
     /*  */
 386 {
 387         if (y>top) {
 388                 y--;
 389                 pos -= video_size_row;
 390                 return;
 391         } else
 392                 scrdown(currcons,top,bottom);
 393         need_wrap = 0;
 394 }
 395 
 396 static inline void cr(int currcons)
     /*  */
 397 {
 398         pos -= x<<1;
 399         need_wrap = x = 0;
 400 }
 401 
 402 static inline void bs(int currcons)
     /*  */
 403 {
 404         if (x) {
 405                 pos -= 2;
 406                 x--;
 407                 need_wrap = 0;
 408         }
 409 }
 410 
 411 static inline void del(int currcons)
     /*  */
 412 {
 413         if (x) {
 414                 pos -= 2;
 415                 x--;
 416                 *(unsigned short *)pos = video_erase_char;
 417                 need_wrap = 0;
 418         }
 419 }
 420 
 421 static void csi_J(int currcons, int vpar)
     /*  */
 422 {
 423         unsigned long count;
 424         unsigned long start;
 425 
 426         switch (vpar) {
 427                 case 0: /* erase from cursor to end of display */
 428                         count = (scr_end-pos)>>1;
 429                         start = pos;
 430                         break;
 431                 case 1: /* erase from start to cursor */
 432                         count = ((pos-origin)>>1)+1;
 433                         start = origin;
 434                         break;
 435                 case 2: /* erase whole display */
 436                         count = video_num_columns * video_num_lines;
 437                         start = origin;
 438                         break;
 439                 default:
 440                         return;
 441         }
 442         __asm__("cld\n\t"
 443                 "rep\n\t"
 444                 "stosw\n\t"
 445                 ::"c" (count),
 446                 "D" (start),"a" (video_erase_char)
 447                 :"cx","di");
 448         need_wrap = 0;
 449 }
 450 
 451 static void csi_K(int currcons, int vpar)
     /*  */
 452 {
 453         long count;
 454         long start;
 455 
 456         switch (vpar) {
 457                 case 0: /* erase from cursor to end of line */
 458                         count = video_num_columns-x;
 459                         start = pos;
 460                         break;
 461                 case 1: /* erase from start of line to cursor */
 462                         start = pos - (x<<1);
 463                         count = x+1;
 464                         break;
 465                 case 2: /* erase whole line */
 466                         start = pos - (x<<1);
 467                         count = video_num_columns;
 468                         break;
 469                 default:
 470                         return;
 471         }
 472         __asm__("cld\n\t"
 473                 "rep\n\t"
 474                 "stosw\n\t"
 475                 ::"c" (count),
 476                 "D" (start),"a" (video_erase_char)
 477                 :"cx","di");
 478         need_wrap = 0;
 479 }
 480 
 481 /*
 482  *  I hope this works. The monochrome part is untested.
 483  */
 484 static void update_attr(int currcons)
     /*  */
 485 {
 486         attr = color;
 487         if (can_do_color) {
 488                 if (underline)
 489                         attr = (attr & 0xf0) | ulcolor;
 490                 else if (intensity == 0)
 491                         attr = (attr & 0xf0) | halfcolor;
 492         }
 493         if (reverse ^ decscnm)
 494                 attr = (attr & 0x88) | (((attr >> 4) | (attr << 4)) & 0x77);
 495         if (blink)
 496                 attr ^= 0x80;
 497         if (intensity == 2)
 498                 attr ^= 0x08;
 499         if (!can_do_color) {
 500                 if (underline)
 501                         attr = (attr & 0xf8) | 0x01;
 502                 else if (intensity == 0)
 503                         attr = (attr & 0xf0) | 0x08;
 504         }
 505         if (decscnm)
 506                 video_erase_char = ((color & 0x88) | (((color >> 4) |
 507                         (color << 4)) & 0x77) << 8) | ' ';
 508         else
 509                 video_erase_char = (color << 8) | ' ';
 510 }
 511 
 512 static void default_attr(int currcons) {
     /*  */
 513         intensity = 1;
 514         underline = 0;
 515         reverse = 0;
 516         blink = 0;
 517         color = def_color;
 518 }
 519 
 520 static void csi_m(int currcons)
     /*  */
 521 {
 522         int i;
 523 
 524         for (i=0;i<=npar;i++)
 525                 switch (par[i]) {
 526                         case 0: /* all attributes off */
 527                                 default_attr(currcons);
 528                                 break;
 529                         case 1:
 530                                 intensity = 2;
 531                                 break;
 532                         case 2:
 533                                 intensity = 0;
 534                                 break;
 535                         case 4:
 536                                 underline = 1;
 537                                 break;
 538                         case 5:
 539                                 blink = 1;
 540                                 break;
 541                         case 7:
 542                                 reverse = 1;
 543                                 break;
 544                         case 21:
 545                         case 22:
 546                                 intensity = 1;
 547                                 break;
 548                         case 24:
 549                                 underline = 0;
 550                                 break;
 551                         case 25:
 552                                 blink = 0;
 553                                 break;
 554                         case 27:
 555                                 reverse = 0;
 556                                 break;
 557                         case 39:
 558                                 color = (def_color & 0x0f) | background;
 559                                 break;
 560                         case 49:
 561                                 color = (def_color & 0xf0) | foreground;
 562                                 break;
 563                         default:
 564                                 if (par[i] >= 30 && par[i] <= 37)
 565                                         color = color_table[par[i]-30]
 566                                                 | background; 
 567                                 else if (par[i] >= 40 && par[i] <= 47)
 568                                         color = (color_table[par[i]-40]<<4)
 569                                                 | foreground;
 570                                 break;
 571                 }
 572         update_attr(currcons);
 573 }
 574 
 575 static inline void hide_cursor(int currcons)
     /*  */
 576 {
 577         outb_p(14, video_port_reg);
 578         outb_p(0xff&((scr_end-video_mem_base)>>9), video_port_val);
 579         outb_p(15, video_port_reg);
 580         outb_p(0xff&((scr_end-video_mem_base)>>1), video_port_val);
 581 }
 582 
 583 static inline void set_cursor(int currcons)
     /*  */
 584 {
 585         if (currcons != fg_console || console_blanked)
 586                 return;
 587         cli();
 588         if (deccm) {
 589                 outb_p(14, video_port_reg);
 590                 outb_p(0xff&((pos-video_mem_base)>>9), video_port_val);
 591                 outb_p(15, video_port_reg);
 592                 outb_p(0xff&((pos-video_mem_base)>>1), video_port_val);
 593         } else
 594                 hide_cursor(currcons);
 595         sti();
 596 }
 597 
 598 static void respond_string(char * p, int currcons, struct tty_struct * tty)
     /*  */
 599 {
 600         while (*p) {
 601                 put_tty_queue(*p, &tty->read_q);
 602                 p++;
 603         }
 604         TTY_READ_FLUSH(tty);
 605 }
 606 
 607 static void respond_num(unsigned int n, int currcons, struct tty_struct * tty)
     /*  */
 608 {
 609         char buff[3];
 610         int i = 0;
 611 
 612         do {
 613                 buff[i++] = (n%10)+'0';
 614                 n /= 10;
 615         } while(n && i < 3);    /* We'll take no chances */
 616         while (i--) {
 617                 put_tty_queue(buff[i], &tty->read_q);
 618         }
 619         /* caller must flush */
 620 }
 621 
 622 static void cursor_report(int currcons, struct tty_struct * tty)
     /*  */
 623 {
 624         put_tty_queue('\033', &tty->read_q);
 625         put_tty_queue('[', &tty->read_q);
 626         respond_num(y + (decom ? top+1 : 1), currcons, tty);
 627         put_tty_queue(';', &tty->read_q);
 628         respond_num(x+1, currcons, tty);
 629         put_tty_queue('R', &tty->read_q);
 630         TTY_READ_FLUSH(tty);
 631 }
 632 
 633 static inline void status_report(int currcons, struct tty_struct * tty)
     /*  */
 634 {
 635         respond_string("\033[0n", currcons, tty);       /* Terminal ok */
 636 }
 637 
 638 static inline void respond_ID(int currcons, struct tty_struct * tty)
     /*  */
 639 {
 640         respond_string(VT102ID, currcons, tty);
 641 }
 642 
 643 static void invert_screen(int currcons) {
     /*  */
 644         unsigned char *p;
 645 
 646         if (can_do_color)
 647                 for (p = (unsigned char *)origin+1; p < (unsigned char *)scr_end; p+=2)
 648                         *p = (*p & 0x88) | (((*p >> 4) | (*p << 4)) & 0x77);
 649         else
 650                 for (p = (unsigned char *)origin+1; p < (unsigned char *)scr_end; p+=2)
 651                         *p ^= *p & 0x07 == 1 ? 0x70 : 0x77;
 652 }
 653 
 654 static void set_mode(int currcons, int on_off)
     /*  */
 655 {
 656         int i;
 657 
 658         for (i=0; i<=npar; i++)
 659                 if (ques) switch(par[i]) {      /* DEC private modes set/reset */
 660                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
 661                                 if (on_off)
 662                                         set_kbd(decckm);
 663                                 else
 664                                         clr_kbd(decckm);
 665                                 break;
 666                         case 3: /* 80/132 mode switch unimplemented */
 667                                 csi_J(currcons,2);
 668                                 gotoxy(currcons,0,0);
 669                                 break;
 670                         case 5:                 /* Inverted screen on/off */
 671                                 if (decscnm != on_off) {
 672                                         decscnm = on_off;
 673                                         invert_screen(currcons);
 674                                         update_attr(currcons);
 675                                 }
 676                                 break;
 677                         case 6:                 /* Origin relative/absolute */
 678                                 decom = on_off;
 679                                 gotoxy(currcons,0,0);
 680                                 break;
 681                         case 7:                 /* Autowrap on/off */
 682                                 decawm = on_off;
 683                                 break;
 684                         case 8:                 /* Autorepeat on/off */
 685                                 if (on_off)
 686                                         set_kbd(decarm);
 687                                 else
 688                                         clr_kbd(decarm);
 689                                 break;
 690                         case 25:                /* Cursor on/off */
 691                                 deccm = on_off;
 692                                 set_cursor(currcons);
 693                                 break;
 694                 } else switch(par[i]) {         /* ANSI modes set/reset */
 695                         case 4:                 /* Insert Mode on/off */
 696                                 decim = on_off;
 697                                 break;
 698                         case 20:                /* Lf, Enter == CrLf/Lf */
 699                                 if (on_off)
 700                                         set_kbd(lnm);
 701                                 else
 702                                         clr_kbd(lnm);
 703                                 break;
 704                 }
 705 }
 706 
 707 static void setterm_command(int currcons)
     /*  */
 708 {
 709         switch(par[0]) {
 710                 case 1: /* set color for underline mode */
 711                         if (can_do_color && par[1] < 16) {
 712                                 ulcolor = color_table[par[1]];
 713                                 if (underline)
 714                                         update_attr(currcons);
 715                         }
 716                         break;
 717                 case 2: /* set color for half intensity mode */
 718                         if (can_do_color && par[1] < 16) {
 719                                 halfcolor = color_table[par[1]];
 720                                 if (intensity == 0)
 721                                         update_attr(currcons);
 722                         }
 723                         break;
 724                 case 8: /* store colors as defaults */
 725                         def_color = attr;
 726                         default_attr(currcons);
 727                         update_attr(currcons);
 728                         break;
 729                 case 9: /* set blanking interval */
 730                         blankinterval = ((par[1] < 60) ? par[1] : 60) * 60 * HZ;
 731                         break;
 732         }
 733 }
 734 
 735 static void insert_char(int currcons)
     /*  */
 736 {
 737         unsigned int i = x;
 738         unsigned short tmp, old = video_erase_char;
 739         unsigned short * p = (unsigned short *) pos;
 740 
 741         while (i++ < video_num_columns) {
 742                 tmp = *p;
 743                 *p = old;
 744                 old = tmp;
 745                 p++;
 746         }
 747         need_wrap = 0;
 748 }
 749 
 750 static void insert_line(int currcons)
     /*  */
 751 {
 752         scrdown(currcons,y,bottom);
 753         need_wrap = 0;
 754 }
 755 
 756 static void delete_char(int currcons)
     /*  */
 757 {
 758         unsigned int i = x;
 759         unsigned short * p = (unsigned short *) pos;
 760 
 761         while (++i < video_num_columns) {
 762                 *p = *(p+1);
 763                 p++;
 764         }
 765         *p = video_erase_char;
 766         need_wrap = 0;
 767 }
 768 
 769 static void delete_line(int currcons)
     /*  */
 770 {
 771         scrup(currcons,y,bottom);
 772         need_wrap = 0;
 773 }
 774 
 775 static void csi_at(int currcons, unsigned int nr)
     /*  */
 776 {
 777         if (nr > video_num_columns)
 778                 nr = video_num_columns;
 779         else if (!nr)
 780                 nr = 1;
 781         while (nr--)
 782                 insert_char(currcons);
 783 }
 784 
 785 static void csi_L(int currcons, unsigned int nr)
     /*  */
 786 {
 787         if (nr > video_num_lines)
 788                 nr = video_num_lines;
 789         else if (!nr)
 790                 nr = 1;
 791         while (nr--)
 792                 insert_line(currcons);
 793 }
 794 
 795 static void csi_P(int currcons, unsigned int nr)
     /*  */
 796 {
 797         if (nr > video_num_columns)
 798                 nr = video_num_columns;
 799         else if (!nr)
 800                 nr = 1;
 801         while (nr--)
 802                 delete_char(currcons);
 803 }
 804 
 805 static void csi_M(int currcons, unsigned int nr)
     /*  */
 806 {
 807         if (nr > video_num_lines)
 808                 nr = video_num_lines;
 809         else if (!nr)
 810                 nr=1;
 811         while (nr--)
 812                 delete_line(currcons);
 813 }
 814 
 815 static void save_cur(int currcons)
     /*  */
 816 {
 817         saved_x         = x;
 818         saved_y         = y;
 819         s_intensity     = intensity;
 820         s_underline     = underline;
 821         s_blink         = blink;
 822         s_reverse       = reverse;
 823         s_charset       = charset;
 824         s_color         = color;
 825         saved_G0        = G0_charset;
 826         saved_G1        = G1_charset;
 827 }
 828 
 829 static void restore_cur(int currcons)
     /*  */
 830 {
 831         gotoxy(currcons,saved_x,saved_y);
 832         intensity       = s_intensity;
 833         underline       = s_underline;
 834         blink           = s_blink;
 835         reverse         = s_reverse;
 836         charset         = s_charset;
 837         color           = s_color;
 838         G0_charset      = saved_G0;
 839         G1_charset      = saved_G1;
 840         translate       = charset ? G1_charset : G0_charset;
 841         update_attr(currcons);
 842         need_wrap = 0;
 843 }
 844 
 845 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey, 
 846         EShash, ESsetG0, ESsetG1, ESignore };
 847 
 848 static void reset_terminal(int currcons, int do_clear)
     /*  */
 849 {
 850         top             = 0;
 851         bottom          = video_num_lines;
 852         state           = ESnormal;
 853         ques            = 0;
 854         translate       = NORM_TRANS;
 855         G0_charset      = NORM_TRANS;
 856         G1_charset      = GRAF_TRANS;
 857         charset         = 0;
 858         need_wrap       = 0;
 859 
 860         decscnm         = 0;
 861         decom           = 0;
 862         decawm          = 1;
 863         deccm           = 1;
 864         decim           = 0;
 865 
 866         set_kbd(decarm);
 867         clr_kbd(decckm);
 868         clr_kbd(kbdapplic);
 869         clr_kbd(lnm);
 870         kbd_table[currcons].flags =
 871                 (kbd_table[currcons].flags & ~LED_MASK) |
 872                 (kbd_table[currcons].default_flags & LED_MASK);
 873         kbdmode         = 0;
 874         set_leds();
 875 
 876         default_attr(currcons);
 877         update_attr(currcons);
 878 
 879         tab_stop[0]     = 0x01010100;
 880         tab_stop[1]     =
 881         tab_stop[2]     =
 882         tab_stop[3]     =
 883         tab_stop[4]     = 0x01010101;
 884 
 885         if (do_clear) {
 886                 gotoxy(currcons,0,0);
 887                 csi_J(currcons,2);
 888                 save_cur(currcons);
 889         }
 890 }
 891 
 892 void con_write(struct tty_struct * tty)
     /*  */
 893 {
 894         int c;
 895         unsigned int currcons;
 896 
 897         wake_up_interruptible(&tty->write_q.proc_list);
 898         currcons = tty->line - 1;
 899         if (currcons >= NR_CONSOLES) {
 900                 printk("con_write: illegal tty (%d)\n", currcons);
 901                 return;
 902         }
 903         while (!tty->stopped && (c = get_tty_queue(&tty->write_q)) >= 0) {
 904                 if (state == ESnormal && translate[c]) {
 905                         if (need_wrap) {
 906                                 cr(currcons);
 907                                 lf(currcons);
 908                         }
 909                         if (decim)
 910                                 insert_char(currcons);
 911                         c = translate[c];
 912                         *(char *) pos = c;
 913                         *(char *) (pos+1) = attr;
 914                         if (x == video_num_columns - 1)
 915                                 need_wrap = decawm;
 916                         else {
 917                                 x++;
 918                                 pos+=2;
 919                         }
 920                         continue;
 921                 }
 922 
 923                 /*
 924                  *  Control characters can be used in the _middle_
 925                  *  of an escape sequence.
 926                  */
 927                 switch (c) {
 928                         case 7:
 929                                 sysbeep();
 930                                 continue;
 931                         case 8:
 932                                 bs(currcons);
 933                                 continue;
 934                         case 9:
 935                                 pos -= (x << 1);
 936                                 while (x < video_num_columns - 1) {
 937                                         x++;
 938                                         if (tab_stop[x >> 5] & (1 << (x & 31)))
 939                                                 break;
 940                                 }
 941                                 pos += (x << 1);
 942                                 continue;
 943                         case 10: case 11: case 12:
 944                                 lf(currcons);
 945                                 if (!is_kbd(lnm))
 946                                         continue;
 947                         case 13:
 948                                 cr(currcons);
 949                                 continue;
 950                         case 14:
 951                                 charset = 1;
 952                                 translate = G1_charset;
 953                                 continue;
 954                         case 15:
 955                                 charset = 0;
 956                                 translate = G0_charset;
 957                                 continue;
 958                         case 24: case 26:
 959                                 state = ESnormal;
 960                                 continue;
 961                         case 27:
 962                                 state = ESesc;
 963                                 continue;
 964                         case 127:
 965                                 del(currcons);
 966                                 continue;
 967                         case 128+27:
 968                                 state = ESsquare;
 969                                 continue;
 970                 }
 971                 switch(state) {
 972                         case ESesc:
 973                                 state = ESnormal;
 974                                 switch (c) {
 975                                   case '[':
 976                                         state = ESsquare;
 977                                         continue;
 978                                   case 'E':
 979                                         cr(currcons);
 980                                         lf(currcons);
 981                                         continue;
 982                                   case 'M':
 983                                         ri(currcons);
 984                                         continue;
 985                                   case 'D':
 986                                         lf(currcons);
 987                                         continue;
 988                                   case 'H':
 989                                         tab_stop[x >> 5] |= (1 << (x & 31));
 990                                         continue;
 991                                   case 'Z':
 992                                         respond_ID(currcons,tty);
 993                                         continue;
 994                                   case '7':
 995                                         save_cur(currcons);
 996                                         continue;
 997                                   case '8':
 998                                         restore_cur(currcons);
 999                                         continue;
1000                                   case '(':
1001                                         state = ESsetG0;
1002                                         continue;
1003                                   case ')':
1004                                         state = ESsetG1;
1005                                         continue;
1006                                   case '#':
1007                                         state = EShash;
1008                                         continue;
1009                                   case 'c':
1010                                         reset_terminal(currcons,1);
1011                                         continue;
1012                                   case '>':  /* Numeric keypad */
1013                                         clr_kbd(kbdapplic);
1014                                         continue;
1015                                   case '=':  /* Appl. keypad */
1016                                         set_kbd(kbdapplic);
1017                                         continue;
1018                                 }       
1019                                 continue;
1020                         case ESsquare:
1021                                 for(npar = 0 ; npar < NPAR ; npar++)
1022                                         par[npar] = 0;
1023                                 npar = 0;
1024                                 state = ESgetpars;
1025                                 if (c == '[') { /* Function key */
1026                                         state=ESfunckey;
1027                                         continue;
1028                                 }
1029                                 ques = (c=='?');
1030                                 if (ques)
1031                                         continue;
1032                         case ESgetpars:
1033                                 if (c==';' && npar<NPAR-1) {
1034                                         npar++;
1035                                         continue;
1036                                 } else if (c>='0' && c<='9') {
1037                                         par[npar] *= 10;
1038                                         par[npar] += c-'0';
1039                                         continue;
1040                                 } else state=ESgotpars;
1041                         case ESgotpars:
1042                                 state = ESnormal;
1043                                 switch(c) {
1044                                         case 'h':
1045                                                 set_mode(currcons,1);
1046                                                 continue;
1047                                         case 'l':
1048                                                 set_mode(currcons,0);
1049                                                 continue;
1050                                         case 'n':
1051                                                 if (!ques)
1052                                                         if (par[0] == 5)
1053                                                                 status_report(currcons,tty);
1054                                                         else if (par[0] == 6)
1055                                                                 cursor_report(currcons,tty);
1056                                                 continue;
1057                                 }
1058                                 if (ques) {
1059                                         ques = 0;
1060                                         continue;
1061                                 }
1062                                 switch(c) {
1063                                         case 'G': case '`':
1064                                                 if (par[0]) par[0]--;
1065                                                 gotoxy(currcons,par[0],y);
1066                                                 continue;
1067                                         case 'A':
1068                                                 if (!par[0]) par[0]++;
1069                                                 gotoxy(currcons,x,y-par[0]);
1070                                                 continue;
1071                                         case 'B': case 'e':
1072                                                 if (!par[0]) par[0]++;
1073                                                 gotoxy(currcons,x,y+par[0]);
1074                                                 continue;
1075                                         case 'C': case 'a':
1076                                                 if (!par[0]) par[0]++;
1077                                                 gotoxy(currcons,x+par[0],y);
1078                                                 continue;
1079                                         case 'D':
1080                                                 if (!par[0]) par[0]++;
1081                                                 gotoxy(currcons,x-par[0],y);
1082                                                 continue;
1083                                         case 'E':
1084                                                 if (!par[0]) par[0]++;
1085                                                 gotoxy(currcons,0,y+par[0]);
1086                                                 continue;
1087                                         case 'F':
1088                                                 if (!par[0]) par[0]++;
1089                                                 gotoxy(currcons,0,y-par[0]);
1090                                                 continue;
1091                                         case 'd':
1092                                                 if (par[0]) par[0]--;
1093                                                 gotoxy(currcons,x,par[0]);
1094                                                 continue;
1095                                         case 'H': case 'f':
1096                                                 if (par[0]) par[0]--;
1097                                                 if (par[1]) par[1]--;
1098                                                 gotoxy(currcons,par[1],par[0]);
1099                                                 continue;
1100                                         case 'J':
1101                                                 csi_J(currcons,par[0]);
1102                                                 continue;
1103                                         case 'K':
1104                                                 csi_K(currcons,par[0]);
1105                                                 continue;
1106                                         case 'L':
1107                                                 csi_L(currcons,par[0]);
1108                                                 continue;
1109                                         case 'M':
1110                                                 csi_M(currcons,par[0]);
1111                                                 continue;
1112                                         case 'P':
1113                                                 csi_P(currcons,par[0]);
1114                                                 continue;
1115                                         case 'c':
1116                                                 if (!par[0])
1117                                                         respond_ID(currcons,tty);
1118                                                 continue;
1119                                         case 'g':
1120                                                 if (!par[0])
1121                                                         tab_stop[x >> 5] &= ~(1 << (x & 31));
1122                                                 else if (par[0] == 3) {
1123                                                         tab_stop[0] =
1124                                                         tab_stop[1] =
1125                                                         tab_stop[2] =
1126                                                         tab_stop[3] =
1127                                                         tab_stop[4] = 0;
1128                                                 }
1129                                                 continue;
1130                                         case 'm':
1131                                                 csi_m(currcons);
1132                                                 continue;
1133                                         case 'r':
1134                                                 if (!par[0])
1135                                                         par[0]++;
1136                                                 if (!par[1])
1137                                                         par[1] = video_num_lines;
1138                                                 /* Minimum allowed region is 2 lines */
1139                                                 if (par[0] < par[1] &&
1140                                                     par[1] <= video_num_lines) {
1141                                                         top=par[0]-1;
1142                                                         bottom=par[1];
1143                                                         gotoxy(currcons,0,0);
1144                                                 }
1145                                                 continue;
1146                                         case 's':
1147                                                 save_cur(currcons);
1148                                                 continue;
1149                                         case 'u':
1150                                                 restore_cur(currcons);
1151                                                 continue;
1152                                         case '@':
1153                                                 csi_at(currcons,par[0]);
1154                                                 continue;
1155                                         case ']': /* setterm functions */
1156                                                 setterm_command(currcons);
1157                                                 continue;
1158                                 }
1159                                 continue;
1160                         case ESfunckey:
1161                                 state = ESnormal;
1162                                 continue;
1163                         case EShash:
1164                                 state = ESnormal;
1165                                 if (c == '8') {
1166                                         /* DEC screen alignment test. kludge :-) */
1167                                         video_erase_char =
1168                                                 (video_erase_char & 0xff00) | 'E';
1169                                         csi_J(currcons, 2);
1170                                         video_erase_char =
1171                                                 (video_erase_char & 0xff00) | ' ';
1172                                 }
1173                                 continue;
1174                         case ESsetG0:
1175                                 if (c == '0')
1176                                         G0_charset = GRAF_TRANS;
1177                                 else if (c == 'B')
1178                                         G0_charset = NORM_TRANS;
1179                                 else if (c == 'U')
1180                                         G0_charset = NULL_TRANS;
1181                                 if (charset == 0)
1182                                         translate = G0_charset;
1183                                 state = ESnormal;
1184                                 continue;
1185                         case ESsetG1:
1186                                 if (c == '0')
1187                                         G1_charset = GRAF_TRANS;
1188                                 else if (c == 'B')
1189                                         G1_charset = NORM_TRANS;
1190                                 else if (c == 'U')
1191                                         G1_charset = NULL_TRANS;
1192                                 if (charset == 1)
1193                                         translate = G1_charset;
1194                                 state = ESnormal;
1195                                 continue;
1196                         default:
1197                                 state = ESnormal;
1198                 }
1199         }
1200         if (vcmode == KD_GRAPHICS)
1201                 return;
1202         set_cursor(currcons);
1203 }
1204 
1205 void do_keyboard_interrupt(void)
     /*  */
1206 {
1207         TTY_READ_FLUSH(TTY_TABLE(0));
1208         timer_active &= ~(1<<BLANK_TIMER);
1209         if (vt_cons[fg_console].vc_mode == KD_GRAPHICS)
1210                 return;
1211         if (console_blanked) {
1212                 timer_table[BLANK_TIMER].expires = 0;
1213                 timer_active |= 1<<BLANK_TIMER;
1214         } else if (blankinterval) {
1215                 timer_table[BLANK_TIMER].expires = jiffies + blankinterval;
1216                 timer_active |= 1<<BLANK_TIMER;
1217         }
1218 }       
1219 
1220 void * memsetw(void * s,unsigned short c,int count)
     /*  */
1221 {
1222 __asm__("cld\n\t"
1223         "rep\n\t"
1224         "stosw"
1225         ::"a" (c),"D" (s),"c" (count)
1226         :"cx","di");
1227 return s;
1228 }
1229 
1230 /*
1231  *  long con_init(long);
1232  *
1233  * This routine initalizes console interrupts, and does nothing
1234  * else. If you want the screen to clear, call tty_write with
1235  * the appropriate escape-sequece.
1236  *
1237  * Reads the information preserved by setup.s to determine the current display
1238  * type and sets everything accordingly.
1239  */
1240 long con_init(long kmem_start)
     /*  */
1241 {
1242         char *display_desc = "????";
1243         int currcons = 0;
1244         long base;
1245         int orig_x = ORIG_X;
1246         int orig_y = ORIG_Y;
1247 
1248         vc_scrmembuf = (unsigned short *) kmem_start;
1249         video_num_columns = ORIG_VIDEO_COLS;
1250         video_size_row = video_num_columns * 2;
1251         video_num_lines = ORIG_VIDEO_LINES;
1252         video_page = ORIG_VIDEO_PAGE;
1253         screen_size = (video_num_lines * video_size_row);
1254         kmem_start += NR_CONSOLES * screen_size;
1255         timer_table[BLANK_TIMER].fn = blank_screen;
1256         timer_table[BLANK_TIMER].expires = 0;
1257         if (blankinterval) {
1258                 timer_table[BLANK_TIMER].expires = jiffies+blankinterval;
1259                 timer_active |= 1<<BLANK_TIMER;
1260         }
1261         
1262         if (ORIG_VIDEO_MODE == 7)       /* Is this a monochrome display? */
1263         {
1264                 video_mem_base = 0xb0000;
1265                 video_port_reg = 0x3b4;
1266                 video_port_val = 0x3b5;
1267                 if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10)
1268                 {
1269                         video_type = VIDEO_TYPE_EGAM;
1270                         video_mem_term = 0xb8000;
1271                         display_desc = "EGA+";
1272                 }
1273                 else
1274                 {
1275                         video_type = VIDEO_TYPE_MDA;
1276                         video_mem_term = 0xb2000;
1277                         display_desc = "*MDA";
1278                 }
1279         }
1280         else                            /* If not, it is color. */
1281         {
1282                 can_do_color = 1;
1283                 video_mem_base = 0xb8000;
1284                 video_port_reg  = 0x3d4;
1285                 video_port_val  = 0x3d5;
1286                 if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10)
1287                 {
1288                         video_type = VIDEO_TYPE_EGAC;
1289                         video_mem_term = 0xc0000;
1290                         display_desc = "EGA+";
1291                 }
1292                 else
1293                 {
1294                         video_type = VIDEO_TYPE_CGA;
1295                         video_mem_term = 0xba000;
1296                         display_desc = "*CGA";
1297                 }
1298         }
1299         
1300         /* Initialize the variables used for scrolling (mostly EGA/VGA) */
1301 
1302         base = (long)vc_scrmembuf;
1303         for (currcons = 0; currcons<NR_CONSOLES; currcons++) {
1304                 pos = origin = video_mem_start = base;
1305                 scr_end = video_mem_end = (base += screen_size);
1306                 vc_scrbuf[currcons] = (unsigned short *) origin;
1307                 vcmode          = KD_TEXT;
1308                 vtmode.mode     = VT_AUTO;
1309                 vtmode.waitv    = 0;
1310                 vtmode.relsig   = 0;
1311                 vtmode.acqsig   = 0;
1312                 vtmode.frsig    = 0;
1313                 vtpid           = -1;
1314                 vtnewvt         = -1;
1315                 clr_kbd(kbdraw);
1316                 def_color       = 0x07;   /* white */
1317                 ulcolor         = 0x0f;   /* bold white */
1318                 halfcolor       = 0x08;   /* grey */
1319                 reset_terminal(currcons, currcons);
1320         }
1321         currcons = fg_console = 0;
1322 
1323         video_mem_start = video_mem_base;
1324         video_mem_end = video_mem_term;
1325         origin = video_mem_start;
1326         scr_end = video_mem_start + video_num_lines * video_size_row;
1327         gotoxy(currcons,0,0);
1328         save_cur(currcons);
1329         gotoxy(currcons,orig_x,orig_y);
1330         update_screen(fg_console);
1331         printable = 1;
1332         printk("Console: %s %s %dx%d, %d virtual consoles\n",
1333                 can_do_color?"colour":"mono",
1334                 display_desc,
1335                 video_num_columns,video_num_lines,
1336                 NR_CONSOLES);
1337         return kmem_start;
1338 }
1339 
1340 /*
1341  * kbdsave doesn't need to do anything: it's all handled automatically
1342  * with the new data structures..
1343  */
1344 void kbdsave(int new_console)
     /*  */
1345 {
1346 }
1347 
1348 static void get_scrmem(int currcons)
     /*  */
1349 {
1350         memcpy((void *)vc_scrbuf[fg_console],(void *)origin, screen_size);
1351         video_mem_start = (unsigned long)vc_scrbuf[fg_console];
1352         origin  = video_mem_start;
1353         scr_end = video_mem_end = video_mem_start+screen_size;
1354         pos = origin + y*video_size_row + (x<<1);
1355 }
1356 
1357 static void set_scrmem(int currcons)
     /*  */
1358 {
1359         video_mem_start = video_mem_base;
1360         video_mem_end = video_mem_term;
1361         origin  = video_mem_start;
1362         scr_end = video_mem_start + screen_size;
1363         pos = origin + y*video_size_row + (x<<1);
1364         memcpy((void *)video_mem_base, (void *)vc_scrbuf[fg_console], screen_size);
1365 }
1366 
1367 void blank_screen(void)
     /*  */
1368 {
1369         if (console_blanked)
1370                 return;
1371         timer_table[BLANK_TIMER].fn = unblank_screen;
1372         get_scrmem(fg_console);
1373         hide_cursor(fg_console);
1374         console_blanked = 1;
1375         memsetw((void *)video_mem_base, 0x0020, video_mem_term-video_mem_base );
1376 }
1377 
1378 void unblank_screen(void)
     /*  */
1379 {
1380         if (!console_blanked)
1381                 return;
1382         timer_table[BLANK_TIMER].fn = blank_screen;
1383         if (blankinterval) {
1384                 timer_table[BLANK_TIMER].expires = jiffies + blankinterval;
1385                 timer_active |= 1<<BLANK_TIMER;
1386         }
1387         console_blanked = 0;
1388         set_scrmem(fg_console);
1389         set_origin(fg_console);
1390         set_cursor(fg_console);
1391 }
1392 
1393 void update_screen(int new_console)
     /*  */
1394 {
1395         static int lock = 0;
1396 
1397         if (new_console == fg_console || lock)
1398                 return;
1399         lock = 1;
1400         kbdsave(new_console);
1401         get_scrmem(fg_console); 
1402         fg_console = new_console;
1403         set_scrmem(fg_console); 
1404         set_origin(fg_console);
1405         set_cursor(new_console);
1406         set_leds();
1407         lock = 0;
1408 }
1409 
1410 /* from bsd-net-2: */
1411 
1412 static void sysbeepstop(void)
     /*  */
1413 {
1414         /* disable counter 2 */
1415         outb(inb_p(0x61)&0xFC, 0x61);
1416 }
1417 
1418 static void sysbeep(void)
     /*  */
1419 {
1420         /* enable counter 2 */
1421         outb_p(inb_p(0x61)|3, 0x61);
1422         /* set command for counter 2, 2 byte write */
1423         outb_p(0xB6, 0x43);
1424         /* send 0x637 for 750 HZ */
1425         outb_p(0x37, 0x42);
1426         outb(0x06, 0x42);
1427         /* 1/8 second */
1428         timer_table[BEEP_TIMER].expires = jiffies + HZ/8;
1429         timer_table[BEEP_TIMER].fn = sysbeepstop;
1430         timer_active |= 1<<BEEP_TIMER;
1431 }
1432 
1433 int do_screendump(int arg)
     /*  */
1434 {
1435         char *sptr, *buf = (char *)arg;
1436         int currcons, l;
1437 
1438         verify_area(buf,2+video_num_columns*video_num_lines);
1439         currcons = get_fs_byte(buf+1);
1440         if ((currcons<0) || (currcons>=NR_CONSOLES))
1441                 return -EIO;
1442         put_fs_byte((char)(video_num_lines),buf++);     
1443         put_fs_byte((char)(video_num_columns),buf++);
1444         currcons = (currcons ? currcons-1 : fg_console);
1445         sptr = (char *) origin;
1446         for (l=video_num_lines*video_num_columns; l>0 ; l--, sptr++)
1447                 put_fs_byte(*sptr++,buf++);     
1448         return(0);
1449 }
1450 
1451 void console_print(const char * b)
     /*  */
1452 {
1453         int currcons = fg_console;
1454         char c;
1455 
1456         if (!printable || currcons<0 || currcons>=NR_CONSOLES)
1457                 return;
1458         while ((c = *(b++)) != 0) {
1459                 if (c == 10 || c == 13 || need_wrap) {
1460                         if (c != 13)
1461                                 lf(currcons);
1462                         cr(currcons);
1463                         if (c == 10 || c == 13)
1464                                 continue;
1465                 }
1466                 *(char *) pos = c;
1467                 *(char *) (pos+1) = attr;
1468                 if (x == video_num_columns - 1) {
1469                         need_wrap = 1;
1470                         continue;
1471                 }
1472                 x++;
1473                 pos+=2;
1474         }
1475         set_cursor(currcons);
1476         if (vt_cons[fg_console].vc_mode == KD_GRAPHICS)
1477                 return;
1478         timer_active &= ~(1<<BLANK_TIMER);
1479         if (console_blanked) {
1480                 timer_table[BLANK_TIMER].expires = 0;
1481                 timer_active |= 1<<BLANK_TIMER;
1482         } else if (blankinterval) {
1483                 timer_table[BLANK_TIMER].expires = jiffies + blankinterval;
1484                 timer_active |= 1<<BLANK_TIMER;
1485         }
1486 }
1487 
1488 /*
1489  * All we do is set the write and ioctl subroutines; later on maybe we'll
1490  * dynamically allocate the console screen memory.
1491  */
1492 int con_open(struct tty_struct *tty, struct file * filp)
     /*  */
1493 {
1494         tty->write = con_write;
1495         tty->ioctl = vt_ioctl;
1496         if (tty->line > NR_CONSOLES)
1497                 return -ENODEV;
1498         return 0;
1499 }
/* */
root/kernel/chr_drv/console.c

DEFINITIONS
