console.c

   1 /*
   2  * QEMU graphical console
   3  *
   4  * Copyright (c) 2004 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "vl.h"
  25
  26 #define DEFAULT_BACKSCROLL 512
  27 #define MAX_CONSOLES 12
  28
  29 #define RGBA(r, g, b, a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
  30 #define RGB(r, g, b) RGBA(r, g, b, 0xff)
  31
  32 typedef struct TextCell {
  33     uint8_t ch;
  34     uint8_t bgcol:4;
  35     uint8_t fgcol:4;
  36 } TextCell;
  37
  38 #define MAX_ESC_PARAMS 3
  39
  40 enum TTYState {
  41     TTY_STATE_NORM,
  42     TTY_STATE_ESC,
  43     TTY_STATE_CSI,
  44 };
  45
  46 struct TextConsole {
  47     int text_console; /* true if text console */
  48     DisplayState *ds;
  49     int g_width, g_height;
  50     int width;
  51     int height;
  52     int total_height;
  53     int backscroll_height;
  54     int fgcol;
  55     int bgcol;
  56     int x, y;
  57     int y_displayed;
  58     int y_base;
  59     TextCell *cells;
  60
  61     enum TTYState state;
  62     int esc_params[MAX_ESC_PARAMS];
  63     int nb_esc_params;
  64
  65     /* kbd read handler */
  66     IOReadHandler *fd_read;
  67     void *fd_opaque;
  68 };
  69
  70 static TextConsole *active_console;
  71 static TextConsole *consoles[MAX_CONSOLES];
  72 static int nb_consoles = 0;
  73
  74 /* convert a RGBA color to a color index usable in graphic primitives */
  75 static unsigned int vga_get_color(DisplayState *ds, unsigned int rgba)
  76 {
  77     unsigned int r, g, b, color;
  78
  79     switch(ds->depth) {
  80 #if 0
  81     case 8:
  82         r = (rgba >> 16) & 0xff;
  83         g = (rgba >> 8) & 0xff;
  84         b = (rgba) & 0xff;
  85         color = (rgb_to_index[r] * 6 * 6) +
  86             (rgb_to_index[g] * 6) +
  87             (rgb_to_index[b]);
  88         break;
  89 #endif
  90     case 15:
  91         r = (rgba >> 16) & 0xff;
  92         g = (rgba >> 8) & 0xff;
  93         b = (rgba) & 0xff;
  94         color = ((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3);
  95         break;
  96     case 16:
  97         r = (rgba >> 16) & 0xff;
  98         g = (rgba >> 8) & 0xff;
  99         b = (rgba) & 0xff;
 100         color = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 101         break;
 102     case 32:
 103     default:
 104         color = rgba;
 105         break;
 106     }
 107     return color;
 108 }
 109
 110 static void vga_fill_rect (DisplayState *ds,
 111                            int posx, int posy, int width, int height, uint32_t color)
 112 {
 113     uint8_t *d, *d1;
 114     int x, y, bpp;
 115
 116     bpp = (ds->depth + 7) >> 3;
 117     d1 = ds->data +
 118         ds->linesize * posy + bpp * posx;
 119     for (y = 0; y < height; y++) {
 120         d = d1;
 121         switch(bpp) {
 122         case 1:
 123             for (x = 0; x < width; x++) {
 124                 *((uint8_t *)d) = color;
 125                 d++;
 126             }
 127             break;
 128         case 2:
 129             for (x = 0; x < width; x++) {
 130                 *((uint16_t *)d) = color;
 131                 d += 2;
 132             }
 133             break;
 134         case 4:
 135             for (x = 0; x < width; x++) {
 136                 *((uint32_t *)d) = color;
 137                 d += 4;
 138             }
 139             break;
 140         }
 141         d1 += ds->linesize;
 142     }
 143 }
 144
 145 /* copy from (xs, ys) to (xd, yd) a rectangle of size (w, h) */
 146 static void vga_bitblt(DisplayState *ds, int xs, int ys, int xd, int yd, int w, int h)
 147 {
 148     const uint8_t *s;
 149     uint8_t *d;
 150     int wb, y, bpp;
 151
 152     bpp = (ds->depth + 7) >> 3;
 153     wb = w * bpp;
 154     if (yd <= ys) {
 155         s = ds->data +
 156             ds->linesize * ys + bpp * xs;
 157         d = ds->data +
 158             ds->linesize * yd + bpp * xd;
 159         for (y = 0; y < h; y++) {
 160             memmove(d, s, wb);
 161             d += ds->linesize;
 162             s += ds->linesize;
 163         }
 164     } else {
 165         s = ds->data +
 166             ds->linesize * (ys + h - 1) + bpp * xs;
 167         d = ds->data +
 168             ds->linesize * (yd + h - 1) + bpp * xd;
 169        for (y = 0; y < h; y++) {
 170             memmove(d, s, wb);
 171             d -= ds->linesize;
 172             s -= ds->linesize;
 173         }
 174     }
 175 }
 176
 177 /***********************************************************/
 178 /* basic char display */
 179
 180 #define FONT_HEIGHT 16
 181 #define FONT_WIDTH 8
 182
 183 #include "vgafont.h"
 184
 185 #define cbswap_32(__x) \
 186 ((uint32_t)( \
 187                 (((uint32_t)(__x) & (uint32_t)0x000000ffUL) << 24) | \
 188                 (((uint32_t)(__x) & (uint32_t)0x0000ff00UL) <<  8) | \
 189                 (((uint32_t)(__x) & (uint32_t)0x00ff0000UL) >>  8) | \
 190                 (((uint32_t)(__x) & (uint32_t)0xff000000UL) >> 24) ))
 191
 192 #ifdef WORDS_BIGENDIAN
 193 #define PAT(x) x
 194 #else
 195 #define PAT(x) cbswap_32(x)
 196 #endif
 197
 198 static const uint32_t dmask16[16] = {
 199     PAT(0x00000000),
 200     PAT(0x000000ff),
 201     PAT(0x0000ff00),
 202     PAT(0x0000ffff),
 203     PAT(0x00ff0000),
 204     PAT(0x00ff00ff),
 205     PAT(0x00ffff00),
 206     PAT(0x00ffffff),
 207     PAT(0xff000000),
 208     PAT(0xff0000ff),
 209     PAT(0xff00ff00),
 210     PAT(0xff00ffff),
 211     PAT(0xffff0000),
 212     PAT(0xffff00ff),
 213     PAT(0xffffff00),
 214     PAT(0xffffffff),
 215 };
 216
 217 static const uint32_t dmask4[4] = {
 218     PAT(0x00000000),
 219     PAT(0x0000ffff),
 220     PAT(0xffff0000),
 221     PAT(0xffffffff),
 222 };
 223
 224 static uint32_t color_table[8];
 225
 226 static const uint32_t color_table_rgb[8] = {
 227     RGB(0x00, 0x00, 0x00),
 228     RGB(0xff, 0x00, 0x00),
 229     RGB(0x00, 0xff, 0x00),
 230     RGB(0xff, 0xff, 0x00),
 231     RGB(0x00, 0x00, 0xff),
 232     RGB(0xff, 0x00, 0xff),
 233     RGB(0x00, 0xff, 0xff),
 234     RGB(0xff, 0xff, 0xff),
 235 };
 236
 237 static inline unsigned int col_expand(DisplayState *ds, unsigned int col)
 238 {
 239     switch(ds->depth) {
 240     case 8:
 241         col |= col << 8;
 242         col |= col << 16;
 243         break;
 244     case 15:
 245     case 16:
 246         col |= col << 16;
 247         break;
 248     default:
 249         break;
 250     }
 251
 252     return col;
 253 }
 254
 255 static void vga_putcharxy(DisplayState *ds, int x, int y, int ch,
 256                           unsigned int fgcol, unsigned int bgcol)
 257 {
 258     uint8_t *d;
 259     const uint8_t *font_ptr;
 260     unsigned int font_data, linesize, xorcol, bpp;
 261     int i;
 262
 263     bpp = (ds->depth + 7) >> 3;
 264     d = ds->data +
 265         ds->linesize * y * FONT_HEIGHT + bpp * x * FONT_WIDTH;
 266     linesize = ds->linesize;
 267     font_ptr = vgafont16 + FONT_HEIGHT * ch;
 268     xorcol = bgcol ^ fgcol;
 269     switch(ds->depth) {
 270     case 8:
 271         for(i = 0; i < FONT_HEIGHT; i++) {
 272             font_data = *font_ptr++;
 273             ((uint32_t *)d)[0] = (dmask16[(font_data >> 4)] & xorcol) ^ bgcol;
 274             ((uint32_t *)d)[1] = (dmask16[(font_data >> 0) & 0xf] & xorcol) ^ bgcol;
 275             d += linesize;
 276         }
 277         break;
 278     case 16:
 279     case 15:
 280         for(i = 0; i < FONT_HEIGHT; i++) {
 281             font_data = *font_ptr++;
 282             ((uint32_t *)d)[0] = (dmask4[(font_data >> 6)] & xorcol) ^ bgcol;
 283             ((uint32_t *)d)[1] = (dmask4[(font_data >> 4) & 3] & xorcol) ^ bgcol;
 284             ((uint32_t *)d)[2] = (dmask4[(font_data >> 2) & 3] & xorcol) ^ bgcol;
 285             ((uint32_t *)d)[3] = (dmask4[(font_data >> 0) & 3] & xorcol) ^ bgcol;
 286             d += linesize;
 287         }
 288         break;
 289     case 32:
 290         for(i = 0; i < FONT_HEIGHT; i++) {
 291             font_data = *font_ptr++;
 292             ((uint32_t *)d)[0] = (-((font_data >> 7)) & xorcol) ^ bgcol;
 293             ((uint32_t *)d)[1] = (-((font_data >> 6) & 1) & xorcol) ^ bgcol;
 294             ((uint32_t *)d)[2] = (-((font_data >> 5) & 1) & xorcol) ^ bgcol;
 295             ((uint32_t *)d)[3] = (-((font_data >> 4) & 1) & xorcol) ^ bgcol;
 296             ((uint32_t *)d)[4] = (-((font_data >> 3) & 1) & xorcol) ^ bgcol;
 297             ((uint32_t *)d)[5] = (-((font_data >> 2) & 1) & xorcol) ^ bgcol;
 298             ((uint32_t *)d)[6] = (-((font_data >> 1) & 1) & xorcol) ^ bgcol;
 299             ((uint32_t *)d)[7] = (-((font_data >> 0) & 1) & xorcol) ^ bgcol;
 300             d += linesize;
 301         }
 302         break;
 303     }
 304 }
 305
 306 static void text_console_resize(TextConsole *s)
 307 {
 308     TextCell *cells, *c, *c1;
 309     int w1, x, y, last_width;
 310
 311     last_width = s->width;
 312     s->width = s->g_width / FONT_WIDTH;
 313     s->height = s->g_height / FONT_HEIGHT;
 314
 315     w1 = last_width;
 316     if (s->width < w1)
 317         w1 = s->width;
 318
 319     cells = qemu_malloc(s->width * s->total_height * sizeof(TextCell));
 320     for(y = 0; y < s->total_height; y++) {
 321         c = &cells[y * s->width];
 322         if (w1 > 0) {
 323             c1 = &s->cells[y * last_width];
 324             for(x = 0; x < w1; x++) {
 325                 *c++ = *c1++;
 326             }
 327         }
 328         for(x = w1; x < s->width; x++) {
 329             c->ch = ' ';
 330             c->fgcol = 7;
 331             c->bgcol = 0;
 332             c++;
 333         }
 334     }
 335     free(s->cells);
 336     s->cells = cells;
 337 }
 338
 339 static void update_xy(TextConsole *s, int x, int y)
 340 {
 341     TextCell *c;
 342     int y1, y2;
 343
 344     if (s == active_console) {
 345         y1 = (s->y_base + y) % s->total_height;
 346         y2 = y1 - s->y_displayed;
 347         if (y2 < 0)
 348             y2 += s->total_height;
 349         if (y2 < s->height) {
 350             c = &s->cells[y1 * s->width + x];
 351             vga_putcharxy(s->ds, x, y2, c->ch,
 352                           color_table[c->fgcol], color_table[c->bgcol]);
 353             dpy_update(s->ds, x * FONT_WIDTH, y2 * FONT_HEIGHT,
 354                        FONT_WIDTH, FONT_HEIGHT);
 355         }
 356     }
 357 }
 358
 359 static void console_show_cursor(TextConsole *s, int show)
 360 {
 361     TextCell *c;
 362     int y, y1;
 363
 364     if (s == active_console) {
 365         y1 = (s->y_base + s->y) % s->total_height;
 366         y = y1 - s->y_displayed;
 367         if (y < 0)
 368             y += s->total_height;
 369         if (y < s->height) {
 370             c = &s->cells[y1 * s->width + s->x];
 371             if (show) {
 372                 vga_putcharxy(s->ds, s->x, y, c->ch,
 373                               color_table[0], color_table[7]);
 374             } else {
 375                 vga_putcharxy(s->ds, s->x, y, c->ch,
 376                               color_table[c->fgcol], color_table[c->bgcol]);
 377             }
 378             dpy_update(s->ds, s->x * FONT_WIDTH, y * FONT_HEIGHT,
 379                        FONT_WIDTH, FONT_HEIGHT);
 380         }
 381     }
 382 }
 383
 384 static void console_refresh(TextConsole *s)
 385 {
 386     TextCell *c;
 387     int x, y, y1;
 388
 389     if (s != active_console)
 390         return;
 391
 392     vga_fill_rect(s->ds, 0, 0, s->ds->width, s->ds->height,
 393                   color_table[0]);
 394     y1 = s->y_displayed;
 395     for(y = 0; y < s->height; y++) {
 396         c = s->cells + y1 * s->width;
 397         for(x = 0; x < s->width; x++) {
 398             vga_putcharxy(s->ds, x, y, c->ch,
 399                           color_table[c->fgcol], color_table[c->bgcol]);
 400             c++;
 401         }
 402         if (++y1 == s->total_height)
 403             y1 = 0;
 404     }
 405     dpy_update(s->ds, 0, 0, s->ds->width, s->ds->height);
 406     console_show_cursor(s, 1);
 407 }
 408
 409 static void console_scroll(int ydelta)
 410 {
 411     TextConsole *s;
 412     int i, y1;
 413
 414     s = active_console;
 415     if (!s || !s->text_console)
 416         return;
 417
 418     if (ydelta > 0) {
 419         for(i = 0; i < ydelta; i++) {
 420             if (s->y_displayed == s->y_base)
 421                 break;
 422             if (++s->y_displayed == s->total_height)
 423                 s->y_displayed = 0;
 424         }
 425     } else {
 426         ydelta = -ydelta;
 427         i = s->backscroll_height;
 428         if (i > s->total_height - s->height)
 429             i = s->total_height - s->height;
 430         y1 = s->y_base - i;
 431         if (y1 < 0)
 432             y1 += s->total_height;
 433         for(i = 0; i < ydelta; i++) {
 434             if (s->y_displayed == y1)
 435                 break;
 436             if (--s->y_displayed < 0)
 437                 s->y_displayed = s->total_height - 1;
 438         }
 439     }
 440     console_refresh(s);
 441 }
 442
 443 static void console_put_lf(TextConsole *s)
 444 {
 445     TextCell *c;
 446     int x, y1;
 447
 448     s->x = 0;
 449     s->y++;
 450     if (s->y >= s->height) {
 451         s->y = s->height - 1;
 452
 453         if (s->y_displayed == s->y_base) {
 454             if (++s->y_displayed == s->total_height)
 455                 s->y_displayed = 0;
 456         }
 457         if (++s->y_base == s->total_height)
 458             s->y_base = 0;
 459         if (s->backscroll_height < s->total_height)
 460             s->backscroll_height++;
 461         y1 = (s->y_base + s->height - 1) % s->total_height;
 462         c = &s->cells[y1 * s->width];
 463         for(x = 0; x < s->width; x++) {
 464             c->ch = ' ';
 465             c->fgcol = s->fgcol;
 466             c->bgcol = s->bgcol;
 467             c++;
 468         }
 469         if (s == active_console && s->y_displayed == s->y_base) {
 470             vga_bitblt(s->ds, 0, FONT_HEIGHT, 0, 0,
 471                        s->width * FONT_WIDTH,
 472                        (s->height - 1) * FONT_HEIGHT);
 473             vga_fill_rect(s->ds, 0, (s->height - 1) * FONT_HEIGHT,
 474                           s->width * FONT_WIDTH, FONT_HEIGHT,
 475                           color_table[s->bgcol]);
 476             dpy_update(s->ds, 0, 0,
 477                        s->width * FONT_WIDTH, s->height * FONT_HEIGHT);
 478         }
 479     }
 480 }
 481
 482 static void console_putchar(TextConsole *s, int ch)
 483 {
 484     TextCell *c;
 485     int y1, i, x;
 486
 487     switch(s->state) {
 488     case TTY_STATE_NORM:
 489         switch(ch) {
 490         case '\r':
 491             s->x = 0;
 492             break;
 493         case '\n':
 494             console_put_lf(s);
 495             break;
 496         case 27:
 497             s->state = TTY_STATE_ESC;
 498             break;
 499         default:
 500             y1 = (s->y_base + s->y) % s->total_height;
 501             c = &s->cells[y1 * s->width + s->x];
 502             c->ch = ch;
 503             c->fgcol = s->fgcol;
 504             c->bgcol = s->bgcol;
 505             update_xy(s, s->x, s->y);
 506             s->x++;
 507             if (s->x >= s->width)
 508                 console_put_lf(s);
 509             break;
 510         }
 511         break;
 512     case TTY_STATE_ESC:
 513         if (ch == '[') {
 514             for(i=0;i<MAX_ESC_PARAMS;i++)
 515                 s->esc_params[i] = 0;
 516             s->nb_esc_params = 0;
 517             s->state = TTY_STATE_CSI;
 518         } else {
 519             s->state = TTY_STATE_NORM;
 520         }
 521         break;
 522     case TTY_STATE_CSI:
 523         if (ch >= '0' && ch <= '9') {
 524             if (s->nb_esc_params < MAX_ESC_PARAMS) {
 525                 s->esc_params[s->nb_esc_params] =
 526                     s->esc_params[s->nb_esc_params] * 10 + ch - '0';
 527             }
 528         } else {
 529             s->nb_esc_params++;
 530             if (ch == ';')
 531                 break;
 532             s->state = TTY_STATE_NORM;
 533             switch(ch) {
 534             case 'D':
 535                 if (s->x > 0)
 536                     s->x--;
 537                 break;
 538             case 'C':
 539                 if (s->x < (s->width - 1))
 540                     s->x++;
 541                 break;
 542             case 'K':
 543                 /* clear to eol */
 544                 y1 = (s->y_base + s->y) % s->total_height;
 545                 for(x = s->x; x < s->width; x++) {
 546                     c = &s->cells[y1 * s->width + x];
 547                     c->ch = ' ';
 548                     c->fgcol = s->fgcol;
 549                     c->bgcol = s->bgcol;
 550                     c++;
 551                     update_xy(s, x, s->y);
 552                 }
 553                 break;
 554             default:
 555                 break;
 556             }
 557             break;
 558         }
 559     }
 560 }
 561
 562 void console_select(unsigned int index)
 563 {
 564     TextConsole *s;
 565
 566     if (index >= MAX_CONSOLES)
 567         return;
 568     s = consoles[index];
 569     if (s) {
 570         active_console = s;
 571         if (s->text_console) {
 572             if (s->g_width != s->ds->width ||
 573                 s->g_height != s->ds->height) {
 574                 s->g_width = s->ds->width;
 575                 s->g_height = s->ds->height;
 576                 text_console_resize(s);
 577             }
 578             console_refresh(s);
 579         }
 580     }
 581 }
 582
 583 static int console_puts(CharDriverState *chr, const uint8_t *buf, int len)
 584 {
 585     TextConsole *s = chr->opaque;
 586     int i;
 587
 588     console_show_cursor(s, 0);
 589     for(i = 0; i < len; i++) {
 590         console_putchar(s, buf[i]);
 591     }
 592     console_show_cursor(s, 1);
 593     return len;
 594 }
 595
 596 static void console_chr_add_read_handler(CharDriverState *chr,
 597                                          IOCanRWHandler *fd_can_read,
 598                                          IOReadHandler *fd_read, void *opaque)
 599 {
 600     TextConsole *s = chr->opaque;
 601     s->fd_read = fd_read;
 602     s->fd_opaque = opaque;
 603 }
 604
 605 static void console_send_event(CharDriverState *chr, int event)
 606 {
 607     TextConsole *s = chr->opaque;
 608     int i;
 609
 610     if (event == CHR_EVENT_FOCUS) {
 611         for(i = 0; i < nb_consoles; i++) {
 612             if (consoles[i] == s) {
 613                 console_select(i);
 614                 break;
 615             }
 616         }
 617     }
 618 }
 619
 620 /* called when an ascii key is pressed */
 621 void kbd_put_keysym(int keysym)
 622 {
 623     TextConsole *s;
 624     uint8_t buf[16], *q;
 625     int c;
 626
 627     s = active_console;
 628     if (!s || !s->text_console)
 629         return;
 630
 631     switch(keysym) {
 632     case QEMU_KEY_CTRL_UP:
 633         console_scroll(-1);
 634         break;
 635     case QEMU_KEY_CTRL_DOWN:
 636         console_scroll(1);
 637         break;
 638     case QEMU_KEY_CTRL_PAGEUP:
 639         console_scroll(-10);
 640         break;
 641     case QEMU_KEY_CTRL_PAGEDOWN:
 642         console_scroll(10);
 643         break;
 644     default:
 645         if (s->fd_read) {
 646             /* convert the QEMU keysym to VT100 key string */
 647             q = buf;
 648             if (keysym >= 0xe100 && keysym <= 0xe11f) {
 649                 *q++ = '\033';
 650                 *q++ = '[';
 651                 c = keysym - 0xe100;
 652                 if (c >= 10)
 653                     *q++ = '0' + (c / 10);
 654                 *q++ = '0' + (c % 10);
 655                 *q++ = '~';
 656             } else if (keysym >= 0xe120 && keysym <= 0xe17f) {
 657                 *q++ = '\033';
 658                 *q++ = '[';
 659                 *q++ = keysym & 0xff;
 660             } else {
 661                 *q++ = keysym;
 662             }
 663             s->fd_read(s->fd_opaque, buf, q - buf);
 664         }
 665         break;
 666     }
 667 }
 668
 669 TextConsole *graphic_console_init(DisplayState *ds)
 670 {
 671     TextConsole *s;
 672
 673     if (nb_consoles >= MAX_CONSOLES)
 674         return NULL;
 675     s = qemu_mallocz(sizeof(TextConsole));
 676     if (!s) {
 677         return NULL;
 678     }
 679     if (!active_console)
 680         active_console = s;
 681     s->ds = ds;
 682     consoles[nb_consoles++] = s;
 683     return s;
 684 }
 685
 686 int is_active_console(TextConsole *s)
 687 {
 688     return s == active_console;
 689 }
 690
 691 CharDriverState *text_console_init(DisplayState *ds)
 692 {
 693     CharDriverState *chr;
 694     TextConsole *s;
 695     int i;
 696     static int color_inited;
 697
 698     chr = qemu_mallocz(sizeof(CharDriverState));
 699     if (!chr)
 700         return NULL;
 701     s = graphic_console_init(ds);
 702     if (!s) {
 703         free(chr);
 704         return NULL;
 705     }
 706     s->text_console = 1;
 707     chr->opaque = s;
 708     chr->chr_write = console_puts;
 709     chr->chr_add_read_handler = console_chr_add_read_handler;
 710     chr->chr_send_event = console_send_event;
 711
 712     if (!color_inited) {
 713         color_inited = 1;
 714         for(i = 0; i < 8; i++) {
 715             color_table[i] = col_expand(s->ds,
 716                                         vga_get_color(s->ds, color_table_rgb[i]));
 717         }
 718     }
 719     s->y_displayed = 0;
 720     s->y_base = 0;
 721     s->total_height = DEFAULT_BACKSCROLL;
 722     s->x = 0;
 723     s->y = 0;
 724     s->fgcol = 7;
 725     s->bgcol = 0;
 726     s->g_width = s->ds->width;
 727     s->g_height = s->ds->height;
 728     text_console_resize(s);
 729
 730     return chr;
 731 }