hw/g364fb.c

   1 /*
   2  * QEMU G364 framebuffer Emulator.
   3  *
   4  * Copyright (c) 2007-2009 Herve Poussineau
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "hw.h"
  21 #include "mips.h"
  22 #include "console.h"
  23 #include "pixel_ops.h"
  24
  25 //#define DEBUG_G364
  26
  27 #ifdef DEBUG_G364
  28 #define DPRINTF(fmt, ...) \
  29 do { printf("g364: " fmt , ## __VA_ARGS__); } while (0)
  30 #else
  31 #define DPRINTF(fmt, ...) do {} while (0)
  32 #endif
  33 #define BADF(fmt, ...) \
  34 do { fprintf(stderr, "g364 ERROR: " fmt , ## __VA_ARGS__);} while (0)
  35
  36 typedef struct G364State {
  37     /* hardware */
  38     uint8_t *vram;
  39     ram_addr_t vram_offset;
  40     int vram_size;
  41     qemu_irq irq;
  42     /* registers */
  43     uint8_t color_palette[256][3];
  44     uint8_t cursor_palette[3][3];
  45     uint16_t cursor[512];
  46     uint32_t cursor_position;
  47     uint32_t ctla;
  48     uint32_t top_of_screen;
  49     uint32_t width, height; /* in pixels */
  50     /* display refresh support */
  51     DisplayState *ds;
  52     int depth;
  53     int blanked;
  54 } G364State;
  55
  56 #define REG_ID       0x000000
  57 #define REG_BOOT     0x080000
  58 #define REG_DISPLAY  0x080118
  59 #define REG_VDISPLAY 0x080150
  60 #define REG_CTLA     0x080300
  61 #define REG_TOP      0x080400
  62 #define REG_CURS_PAL 0x080508
  63 #define REG_CURS_POS 0x080638
  64 #define REG_CLR_PAL  0x080800
  65 #define REG_CURS_PAT 0x081000
  66 #define REG_RESET    0x180000
  67
  68 #define CTLA_FORCE_BLANK 0x00000400
  69 #define CTLA_NO_CURSOR   0x00800000
  70
  71 static inline int check_dirty(ram_addr_t page)
  72 {
  73     return cpu_physical_memory_get_dirty(page, VGA_DIRTY_FLAG);
  74 }
  75
  76 static inline void reset_dirty(G364State *s,
  77                                ram_addr_t page_min, ram_addr_t page_max)
  78 {
  79     cpu_physical_memory_reset_dirty(page_min, page_max + TARGET_PAGE_SIZE - 1,
  80                                     VGA_DIRTY_FLAG);
  81 }
  82
  83 static void g364fb_draw_graphic8(G364State *s)
  84 {
  85     int i, w;
  86     uint8_t *vram;
  87     uint8_t *data_display, *dd;
  88     ram_addr_t page, page_min, page_max;
  89     int x, y;
  90     int xmin, xmax;
  91     int ymin, ymax;
  92     int xcursor, ycursor;
  93     unsigned int (*rgb_to_pixel)(unsigned int r, unsigned int g, unsigned int b);
  94
  95     switch (ds_get_bits_per_pixel(s->ds)) {
  96         case 8:
  97             rgb_to_pixel = rgb_to_pixel8;
  98             w = 1;
  99             break;
 100         case 15:
 101             rgb_to_pixel = rgb_to_pixel15;
 102             w = 2;
 103             break;
 104         case 16:
 105             rgb_to_pixel = rgb_to_pixel16;
 106             w = 2;
 107             break;
 108         case 32:
 109             rgb_to_pixel = rgb_to_pixel32;
 110             w = 4;
 111             break;
 112         default:
 113             BADF("unknown host depth %d\n", ds_get_bits_per_pixel(s->ds));
 114             return;
 115     }
 116
 117     page = s->vram_offset;
 118     page_min = (ram_addr_t)-1;
 119     page_max = 0;
 120
 121     x = y = 0;
 122     xmin = s->width;
 123     xmax = 0;
 124     ymin = s->height;
 125     ymax = 0;
 126
 127     if (!(s->ctla & CTLA_NO_CURSOR)) {
 128         xcursor = s->cursor_position >> 12;
 129         ycursor = s->cursor_position & 0xfff;
 130     } else {
 131         xcursor = ycursor = -65;
 132     }
 133
 134     vram = s->vram + s->top_of_screen;
 135     /* XXX: out of range in vram? */
 136     data_display = dd = ds_get_data(s->ds);
 137     while (y < s->height) {
 138         if (check_dirty(page)) {
 139             if (y < ymin)
 140                 ymin = ymax = y;
 141             if (page_min == (ram_addr_t)-1)
 142                 page_min = page;
 143             page_max = page;
 144             if (x < xmin)
 145                 xmin = x;
 146             for (i = 0; i < TARGET_PAGE_SIZE; i++) {
 147                 uint8_t index;
 148                 unsigned int color;
 149                 if (unlikely((y >= ycursor && y < ycursor + 64) &&
 150                     (x >= xcursor && x < xcursor + 64))) {
 151                     /* pointer area */
 152                     int xdiff = x - xcursor;
 153                     uint16_t curs = s->cursor[(y - ycursor) * 8 + xdiff / 8];
 154                     int op = (curs >> ((xdiff & 7) * 2)) & 3;
 155                     if (likely(op == 0)) {
 156                         /* transparent */
 157                         index = *vram;
 158                         color = (*rgb_to_pixel)(
 159                             s->color_palette[index][0],
 160                             s->color_palette[index][1],
 161                             s->color_palette[index][2]);
 162                     } else {
 163                         /* get cursor color */
 164                         index = op - 1;
 165                         color = (*rgb_to_pixel)(
 166                             s->cursor_palette[index][0],
 167                             s->cursor_palette[index][1],
 168                             s->cursor_palette[index][2]);
 169                     }
 170                 } else {
 171                     /* normal area */
 172                     index = *vram;
 173                     color = (*rgb_to_pixel)(
 174                         s->color_palette[index][0],
 175                         s->color_palette[index][1],
 176                         s->color_palette[index][2]);
 177                 }
 178                 memcpy(dd, &color, w);
 179                 dd += w;
 180                 x++;
 181                 vram++;
 182                 if (x == s->width) {
 183                     xmax = s->width - 1;
 184                     y++;
 185                     if (y == s->height) {
 186                         ymax = s->height - 1;
 187                         goto done;
 188                     }
 189                     data_display = dd = data_display + ds_get_linesize(s->ds);
 190                     xmin = 0;
 191                     x = 0;
 192                 }
 193             }
 194             if (x > xmax)
 195                 xmax = x;
 196             if (y > ymax)
 197                 ymax = y;
 198         } else {
 199             int dy;
 200             if (page_min != (ram_addr_t)-1) {
 201                 reset_dirty(s, page_min, page_max);
 202                 page_min = (ram_addr_t)-1;
 203                 page_max = 0;
 204                 dpy_update(s->ds, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 205                 xmin = s->width;
 206                 xmax = 0;
 207                 ymin = s->height;
 208                 ymax = 0;
 209             }
 210             x += TARGET_PAGE_SIZE;
 211             dy = x / s->width;
 212             x = x % s->width;
 213             y += dy;
 214             vram += TARGET_PAGE_SIZE;
 215             data_display += dy * ds_get_linesize(s->ds);
 216             dd = data_display + x * w;
 217         }
 218         page += TARGET_PAGE_SIZE;
 219     }
 220
 221 done:
 222     if (page_min != (ram_addr_t)-1) {
 223         dpy_update(s->ds, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 224         reset_dirty(s, page_min, page_max);
 225     }
 226 }
 227
 228 static void g364fb_draw_blank(G364State *s)
 229 {
 230     int i, w;
 231     uint8_t *d;
 232
 233     if (s->blanked) {
 234         /* Screen is already blank. No need to redraw it */
 235         return;
 236     }
 237
 238     w = s->width * ((ds_get_bits_per_pixel(s->ds) + 7) >> 3);
 239     d = ds_get_data(s->ds);
 240     for (i = 0; i < s->height; i++) {
 241         memset(d, 0, w);
 242         d += ds_get_linesize(s->ds);
 243     }
 244
 245     dpy_update(s->ds, 0, 0, s->width, s->height);
 246     s->blanked = 1;
 247 }
 248
 249 static void g364fb_update_display(void *opaque)
 250 {
 251     G364State *s = opaque;
 252
 253     if (s->width == 0 || s->height == 0)
 254         return;
 255
 256     if (s->width != ds_get_width(s->ds) || s->height != ds_get_height(s->ds)) {
 257         qemu_console_resize(s->ds, s->width, s->height);
 258     }
 259
 260     if (s->ctla & CTLA_FORCE_BLANK) {
 261         g364fb_draw_blank(s);
 262     } else if (s->depth == 8) {
 263         g364fb_draw_graphic8(s);
 264     } else {
 265         BADF("unknown guest depth %d\n", s->depth);
 266     }
 267
 268     qemu_irq_raise(s->irq);
 269 }
 270
 271 static inline void g364fb_invalidate_display(void *opaque)
 272 {
 273     G364State *s = opaque;
 274     int i;
 275
 276     s->blanked = 0;
 277     for (i = 0; i < s->vram_size; i += TARGET_PAGE_SIZE) {
 278         cpu_physical_memory_set_dirty(s->vram_offset + i);
 279     }
 280 }
 281
 282 static void g364fb_reset(void *opaque)
 283 {
 284     G364State *s = opaque;
 285     qemu_irq_lower(s->irq);
 286
 287     memset(s->color_palette, 0, sizeof(s->color_palette));
 288     memset(s->cursor_palette, 0, sizeof(s->cursor_palette));
 289     memset(s->cursor, 0, sizeof(s->cursor));
 290     s->cursor_position = 0;
 291     s->ctla = 0;
 292     s->top_of_screen = 0;
 293     s->width = s->height = 0;
 294     memset(s->vram, 0, s->vram_size);
 295     g364fb_invalidate_display(opaque);
 296 }
 297
 298 static void g364fb_screen_dump(void *opaque, const char *filename)
 299 {
 300     G364State *s = opaque;
 301     int y, x;
 302     uint8_t index;
 303     uint8_t *data_buffer;
 304     FILE *f;
 305
 306     if (s->depth != 8) {
 307         BADF("unknown guest depth %d\n", s->depth);
 308         return;
 309     }
 310
 311     f = fopen(filename, "wb");
 312     if (!f)
 313         return;
 314
 315     if (s->ctla & CTLA_FORCE_BLANK) {
 316         /* blank screen */
 317         fprintf(f, "P4\n%d %d\n",
 318             s->width, s->height);
 319         for (y = 0; y < s->height; y++)
 320             for (x = 0; x < s->width; x++)
 321                 fputc(0, f);
 322     } else {
 323         data_buffer = s->vram + s->top_of_screen;
 324         fprintf(f, "P6\n%d %d\n%d\n",
 325             s->width, s->height, 255);
 326         for (y = 0; y < s->height; y++)
 327             for (x = 0; x < s->width; x++, data_buffer++) {
 328                 index = *data_buffer;
 329                 fputc(s->color_palette[index][0], f);
 330                 fputc(s->color_palette[index][1], f);
 331                 fputc(s->color_palette[index][2], f);
 332         }
 333     }
 334
 335     fclose(f);
 336 }
 337
 338 /* called for accesses to io ports */
 339 static uint32_t g364fb_ctrl_readl(void *opaque, target_phys_addr_t addr)
 340 {
 341     G364State *s = opaque;
 342     uint32_t val;
 343
 344     if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 345         /* cursor pattern */
 346         int idx = (addr - REG_CURS_PAT) >> 3;
 347         val = s->cursor[idx];
 348     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 349         /* cursor palette */
 350         int idx = (addr - REG_CURS_PAL) >> 3;
 351         val = ((uint32_t)s->cursor_palette[idx][0] << 16);
 352         val |= ((uint32_t)s->cursor_palette[idx][1] << 8);
 353         val |= ((uint32_t)s->cursor_palette[idx][2] << 0);
 354     } else {
 355         switch (addr) {
 356             case REG_ID:
 357                 val = 0x10; /* Mips G364 */
 358                 break;
 359             case REG_DISPLAY:
 360                 val = s->width / 4;
 361                 break;
 362             case REG_VDISPLAY:
 363                 val = s->height * 2;
 364                 break;
 365             case REG_CTLA:
 366                 val = s->ctla;
 367                 break;
 368             default:
 369             {
 370                 BADF("invalid read at [" TARGET_FMT_plx "]\n", addr);
 371                 val = 0;
 372                 break;
 373             }
 374         }
 375     }
 376
 377     DPRINTF("read 0x%08x at [" TARGET_FMT_plx "]\n", val, addr);
 378
 379     return val;
 380 }
 381
 382 static uint32_t g364fb_ctrl_readw(void *opaque, target_phys_addr_t addr)
 383 {
 384     uint32_t v = g364fb_ctrl_readl(opaque, addr & ~0x3);
 385     if (addr & 0x2)
 386         return v >> 16;
 387     else
 388         return v & 0xffff;
 389 }
 390
 391 static uint32_t g364fb_ctrl_readb(void *opaque, target_phys_addr_t addr)
 392 {
 393     uint32_t v = g364fb_ctrl_readl(opaque, addr & ~0x3);
 394     return (v >> (8 * (addr & 0x3))) & 0xff;
 395 }
 396
 397 static void g364fb_update_depth(G364State *s)
 398 {
 399     static const int depths[8] = { 1, 2, 4, 8, 15, 16, 0 };
 400     s->depth = depths[(s->ctla & 0x00700000) >> 20];
 401 }
 402
 403 static void g364_invalidate_cursor_position(G364State *s)
 404 {
 405     int ymin, ymax, start, end, i;
 406
 407     /* invalidate only near the cursor */
 408     ymin = s->cursor_position & 0xfff;
 409     ymax = MIN(s->height, ymin + 64);
 410     start = ymin * ds_get_linesize(s->ds);
 411     end = (ymax + 1) * ds_get_linesize(s->ds);
 412
 413     for (i = start; i < end; i += TARGET_PAGE_SIZE) {
 414         cpu_physical_memory_set_dirty(s->vram_offset + i);
 415     }
 416 }
 417
 418 static void g364fb_ctrl_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
 419 {
 420     G364State *s = opaque;
 421
 422     DPRINTF("write 0x%08x at [" TARGET_FMT_plx "]\n", val, addr);
 423
 424     if (addr >= REG_CLR_PAL && addr < REG_CLR_PAL + 0x800) {
 425         /* color palette */
 426         int idx = (addr - REG_CLR_PAL) >> 3;
 427         s->color_palette[idx][0] = (val >> 16) & 0xff;
 428         s->color_palette[idx][1] = (val >> 8) & 0xff;
 429         s->color_palette[idx][2] = val & 0xff;
 430         g364fb_invalidate_display(s);
 431     } else if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 432         /* cursor pattern */
 433         int idx = (addr - REG_CURS_PAT) >> 3;
 434         s->cursor[idx] = val;
 435         g364fb_invalidate_display(s);
 436     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 437         /* cursor palette */
 438         int idx = (addr - REG_CURS_PAL) >> 3;
 439         s->cursor_palette[idx][0] = (val >> 16) & 0xff;
 440         s->cursor_palette[idx][1] = (val >> 8) & 0xff;
 441         s->cursor_palette[idx][2] = val & 0xff;
 442         g364fb_invalidate_display(s);
 443     } else {
 444         switch (addr) {
 445             case REG_ID: /* Card identifier; read-only */
 446             case REG_BOOT: /* Boot timing */
 447             case 0x80108: /* Line timing: half sync */
 448             case 0x80110: /* Line timing: back porch */
 449             case 0x80120: /* Line timing: short display */
 450             case 0x80128: /* Frame timing: broad pulse */
 451             case 0x80130: /* Frame timing: v sync */
 452             case 0x80138: /* Frame timing: v preequalise */
 453             case 0x80140: /* Frame timing: v postequalise */
 454             case 0x80148: /* Frame timing: v blank */
 455             case 0x80158: /* Line timing: line time */
 456             case 0x80160: /* Frame store: line start */
 457             case 0x80168: /* vram cycle: mem init */
 458             case 0x80170: /* vram cycle: transfer delay */
 459             case 0x80200: /* vram cycle: mask register */
 460                 /* ignore */
 461                 break;
 462             case REG_TOP:
 463                 s->top_of_screen = val;
 464                 g364fb_invalidate_display(s);
 465                 break;
 466             case REG_DISPLAY:
 467                 s->width = val * 4;
 468                 break;
 469             case REG_VDISPLAY:
 470                 s->height = val / 2;
 471                 break;
 472             case REG_CTLA:
 473                 s->ctla = val;
 474                 g364fb_update_depth(s);
 475                 g364fb_invalidate_display(s);
 476                 break;
 477             case REG_CURS_POS:
 478                 g364_invalidate_cursor_position(s);
 479                 s->cursor_position = val;
 480                 g364_invalidate_cursor_position(s);
 481                 break;
 482             case REG_RESET:
 483                 g364fb_reset(s);
 484                 break;
 485             default:
 486                 BADF("invalid write of 0x%08x at [" TARGET_FMT_plx "]\n", val, addr);
 487                 break;
 488         }
 489     }
 490     qemu_irq_lower(s->irq);
 491 }
 492
 493 static void g364fb_ctrl_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
 494 {
 495     uint32_t old_val = g364fb_ctrl_readl(opaque, addr & ~0x3);
 496
 497     if (addr & 0x2)
 498         val = (val << 16) | (old_val & 0x0000ffff);
 499     else
 500         val = val | (old_val & 0xffff0000);
 501     g364fb_ctrl_writel(opaque, addr & ~0x3, val);
 502 }
 503
 504 static void g364fb_ctrl_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
 505 {
 506     uint32_t old_val = g364fb_ctrl_readl(opaque, addr & ~0x3);
 507
 508     switch (addr & 3) {
 509     case 0:
 510         val = val | (old_val & 0xffffff00);
 511         break;
 512     case 1:
 513         val = (val << 8) | (old_val & 0xffff00ff);
 514         break;
 515     case 2:
 516         val = (val << 16) | (old_val & 0xff00ffff);
 517         break;
 518     case 3:
 519         val = (val << 24) | (old_val & 0x00ffffff);
 520         break;
 521     }
 522     g364fb_ctrl_writel(opaque, addr & ~0x3, val);
 523 }
 524
 525 static CPUReadMemoryFunc * const g364fb_ctrl_read[3] = {
 526     g364fb_ctrl_readb,
 527     g364fb_ctrl_readw,
 528     g364fb_ctrl_readl,
 529 };
 530
 531 static CPUWriteMemoryFunc * const g364fb_ctrl_write[3] = {
 532     g364fb_ctrl_writeb,
 533     g364fb_ctrl_writew,
 534     g364fb_ctrl_writel,
 535 };
 536
 537 static int g364fb_load(QEMUFile *f, void *opaque, int version_id)
 538 {
 539     G364State *s = opaque;
 540     unsigned int i, vram_size;
 541
 542     if (version_id != 1)
 543         return -EINVAL;
 544
 545     vram_size = qemu_get_be32(f);
 546     if (vram_size < s->vram_size)
 547         return -EINVAL;
 548     qemu_get_buffer(f, s->vram, s->vram_size);
 549     for (i = 0; i < 256; i++)
 550         qemu_get_buffer(f, s->color_palette[i], 3);
 551     for (i = 0; i < 3; i++)
 552         qemu_get_buffer(f, s->cursor_palette[i], 3);
 553     qemu_get_buffer(f, (uint8_t *)s->cursor, sizeof(s->cursor));
 554     s->cursor_position = qemu_get_be32(f);
 555     s->ctla = qemu_get_be32(f);
 556     s->top_of_screen = qemu_get_be32(f);
 557     s->width = qemu_get_be32(f);
 558     s->height = qemu_get_be32(f);
 559
 560     /* force refresh */
 561     g364fb_update_depth(s);
 562     g364fb_invalidate_display(s);
 563
 564     return 0;
 565 }
 566
 567 static void g364fb_save(QEMUFile *f, void *opaque)
 568 {
 569     G364State *s = opaque;
 570     int i;
 571
 572     qemu_put_be32(f, s->vram_size);
 573     qemu_put_buffer(f, s->vram, s->vram_size);
 574     for (i = 0; i < 256; i++)
 575         qemu_put_buffer(f, s->color_palette[i], 3);
 576     for (i = 0; i < 3; i++)
 577         qemu_put_buffer(f, s->cursor_palette[i], 3);
 578     qemu_put_buffer(f, (uint8_t *)s->cursor, sizeof(s->cursor));
 579     qemu_put_be32(f, s->cursor_position);
 580     qemu_put_be32(f, s->ctla);
 581     qemu_put_be32(f, s->top_of_screen);
 582     qemu_put_be32(f, s->width);
 583     qemu_put_be32(f, s->height);
 584 }
 585
 586 int g364fb_mm_init(target_phys_addr_t vram_base,
 587                    target_phys_addr_t ctrl_base, int it_shift,
 588                    qemu_irq irq)
 589 {
 590     G364State *s;
 591     int io_ctrl;
 592
 593     s = qemu_mallocz(sizeof(G364State));
 594
 595     s->vram_size = 8 * 1024 * 1024;
 596     s->vram_offset = qemu_ram_alloc(NULL, "g364fb.vram", s->vram_size);
 597     s->vram = qemu_get_ram_ptr(s->vram_offset);
 598     s->irq = irq;
 599
 600     qemu_register_reset(g364fb_reset, s);
 601     register_savevm(NULL, "g364fb", 0, 1, g364fb_save, g364fb_load, s);
 602     g364fb_reset(s);
 603
 604     s->ds = graphic_console_init(g364fb_update_display,
 605                                  g364fb_invalidate_display,
 606                                  g364fb_screen_dump, NULL, s);
 607
 608     cpu_register_physical_memory(vram_base, s->vram_size, s->vram_offset);
 609
 610     io_ctrl = cpu_register_io_memory(g364fb_ctrl_read, g364fb_ctrl_write, s,
 611                                      DEVICE_NATIVE_ENDIAN);
 612     cpu_register_physical_memory(ctrl_base, 0x200000, io_ctrl);
 613
 614     return 0;
 615 }