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     MemoryRegion vram_region;
  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(G364State *s, ram_addr_t page)
  72 {
  73     return memory_region_get_dirty(&s->vram_region, page, DIRTY_MEMORY_VGA);
  74 }
  75
  76 static inline void reset_dirty(G364State *s,
  77                                ram_addr_t page_min, ram_addr_t page_max)
  78 {
  79     memory_region_reset_dirty(&s->vram_region, page_min,
  80                               page_max + TARGET_PAGE_SIZE - 1,
  81                               DIRTY_MEMORY_VGA);
  82 }
  83
  84 static void g364fb_draw_graphic8(G364State *s)
  85 {
  86     int i, w;
  87     uint8_t *vram;
  88     uint8_t *data_display, *dd;
  89     ram_addr_t page, page_min, page_max;
  90     int x, y;
  91     int xmin, xmax;
  92     int ymin, ymax;
  93     int xcursor, ycursor;
  94     unsigned int (*rgb_to_pixel)(unsigned int r, unsigned int g, unsigned int b);
  95
  96     switch (ds_get_bits_per_pixel(s->ds)) {
  97         case 8:
  98             rgb_to_pixel = rgb_to_pixel8;
  99             w = 1;
 100             break;
 101         case 15:
 102             rgb_to_pixel = rgb_to_pixel15;
 103             w = 2;
 104             break;
 105         case 16:
 106             rgb_to_pixel = rgb_to_pixel16;
 107             w = 2;
 108             break;
 109         case 32:
 110             rgb_to_pixel = rgb_to_pixel32;
 111             w = 4;
 112             break;
 113         default:
 114             BADF("unknown host depth %d\n", ds_get_bits_per_pixel(s->ds));
 115             return;
 116     }
 117
 118     page = 0;
 119     page_min = (ram_addr_t)-1;
 120     page_max = 0;
 121
 122     x = y = 0;
 123     xmin = s->width;
 124     xmax = 0;
 125     ymin = s->height;
 126     ymax = 0;
 127
 128     if (!(s->ctla & CTLA_NO_CURSOR)) {
 129         xcursor = s->cursor_position >> 12;
 130         ycursor = s->cursor_position & 0xfff;
 131     } else {
 132         xcursor = ycursor = -65;
 133     }
 134
 135     vram = s->vram + s->top_of_screen;
 136     /* XXX: out of range in vram? */
 137     data_display = dd = ds_get_data(s->ds);
 138     while (y < s->height) {
 139         if (check_dirty(s, page)) {
 140             if (y < ymin)
 141                 ymin = ymax = y;
 142             if (page_min == (ram_addr_t)-1)
 143                 page_min = page;
 144             page_max = page;
 145             if (x < xmin)
 146                 xmin = x;
 147             for (i = 0; i < TARGET_PAGE_SIZE; i++) {
 148                 uint8_t index;
 149                 unsigned int color;
 150                 if (unlikely((y >= ycursor && y < ycursor + 64) &&
 151                     (x >= xcursor && x < xcursor + 64))) {
 152                     /* pointer area */
 153                     int xdiff = x - xcursor;
 154                     uint16_t curs = s->cursor[(y - ycursor) * 8 + xdiff / 8];
 155                     int op = (curs >> ((xdiff & 7) * 2)) & 3;
 156                     if (likely(op == 0)) {
 157                         /* transparent */
 158                         index = *vram;
 159                         color = (*rgb_to_pixel)(
 160                             s->color_palette[index][0],
 161                             s->color_palette[index][1],
 162                             s->color_palette[index][2]);
 163                     } else {
 164                         /* get cursor color */
 165                         index = op - 1;
 166                         color = (*rgb_to_pixel)(
 167                             s->cursor_palette[index][0],
 168                             s->cursor_palette[index][1],
 169                             s->cursor_palette[index][2]);
 170                     }
 171                 } else {
 172                     /* normal area */
 173                     index = *vram;
 174                     color = (*rgb_to_pixel)(
 175                         s->color_palette[index][0],
 176                         s->color_palette[index][1],
 177                         s->color_palette[index][2]);
 178                 }
 179                 memcpy(dd, &color, w);
 180                 dd += w;
 181                 x++;
 182                 vram++;
 183                 if (x == s->width) {
 184                     xmax = s->width - 1;
 185                     y++;
 186                     if (y == s->height) {
 187                         ymax = s->height - 1;
 188                         goto done;
 189                     }
 190                     data_display = dd = data_display + ds_get_linesize(s->ds);
 191                     xmin = 0;
 192                     x = 0;
 193                 }
 194             }
 195             if (x > xmax)
 196                 xmax = x;
 197             if (y > ymax)
 198                 ymax = y;
 199         } else {
 200             int dy;
 201             if (page_min != (ram_addr_t)-1) {
 202                 reset_dirty(s, page_min, page_max);
 203                 page_min = (ram_addr_t)-1;
 204                 page_max = 0;
 205                 dpy_update(s->ds, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 206                 xmin = s->width;
 207                 xmax = 0;
 208                 ymin = s->height;
 209                 ymax = 0;
 210             }
 211             x += TARGET_PAGE_SIZE;
 212             dy = x / s->width;
 213             x = x % s->width;
 214             y += dy;
 215             vram += TARGET_PAGE_SIZE;
 216             data_display += dy * ds_get_linesize(s->ds);
 217             dd = data_display + x * w;
 218         }
 219         page += TARGET_PAGE_SIZE;
 220     }
 221
 222 done:
 223     if (page_min != (ram_addr_t)-1) {
 224         dpy_update(s->ds, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 225         reset_dirty(s, page_min, page_max);
 226     }
 227 }
 228
 229 static void g364fb_draw_blank(G364State *s)
 230 {
 231     int i, w;
 232     uint8_t *d;
 233
 234     if (s->blanked) {
 235         /* Screen is already blank. No need to redraw it */
 236         return;
 237     }
 238
 239     w = s->width * ((ds_get_bits_per_pixel(s->ds) + 7) >> 3);
 240     d = ds_get_data(s->ds);
 241     for (i = 0; i < s->height; i++) {
 242         memset(d, 0, w);
 243         d += ds_get_linesize(s->ds);
 244     }
 245
 246     dpy_update(s->ds, 0, 0, s->width, s->height);
 247     s->blanked = 1;
 248 }
 249
 250 static void g364fb_update_display(void *opaque)
 251 {
 252     G364State *s = opaque;
 253
 254     if (s->width == 0 || s->height == 0)
 255         return;
 256
 257     if (s->width != ds_get_width(s->ds) || s->height != ds_get_height(s->ds)) {
 258         qemu_console_resize(s->ds, s->width, s->height);
 259     }
 260
 261     if (s->ctla & CTLA_FORCE_BLANK) {
 262         g364fb_draw_blank(s);
 263     } else if (s->depth == 8) {
 264         g364fb_draw_graphic8(s);
 265     } else {
 266         BADF("unknown guest depth %d\n", s->depth);
 267     }
 268
 269     qemu_irq_raise(s->irq);
 270 }
 271
 272 static inline void g364fb_invalidate_display(void *opaque)
 273 {
 274     G364State *s = opaque;
 275     int i;
 276
 277     s->blanked = 0;
 278     for (i = 0; i < s->vram_size; i += TARGET_PAGE_SIZE) {
 279         memory_region_set_dirty(&s->vram_region, i);
 280     }
 281 }
 282
 283 static void g364fb_reset(void *opaque)
 284 {
 285     G364State *s = opaque;
 286     qemu_irq_lower(s->irq);
 287
 288     memset(s->color_palette, 0, sizeof(s->color_palette));
 289     memset(s->cursor_palette, 0, sizeof(s->cursor_palette));
 290     memset(s->cursor, 0, sizeof(s->cursor));
 291     s->cursor_position = 0;
 292     s->ctla = 0;
 293     s->top_of_screen = 0;
 294     s->width = s->height = 0;
 295     memset(s->vram, 0, s->vram_size);
 296     g364fb_invalidate_display(opaque);
 297 }
 298
 299 static void g364fb_screen_dump(void *opaque, const char *filename)
 300 {
 301     G364State *s = opaque;
 302     int y, x;
 303     uint8_t index;
 304     uint8_t *data_buffer;
 305     FILE *f;
 306
 307     if (s->depth != 8) {
 308         BADF("unknown guest depth %d\n", s->depth);
 309         return;
 310     }
 311
 312     f = fopen(filename, "wb");
 313     if (!f)
 314         return;
 315
 316     if (s->ctla & CTLA_FORCE_BLANK) {
 317         /* blank screen */
 318         fprintf(f, "P4\n%d %d\n",
 319             s->width, s->height);
 320         for (y = 0; y < s->height; y++)
 321             for (x = 0; x < s->width; x++)
 322                 fputc(0, f);
 323     } else {
 324         data_buffer = s->vram + s->top_of_screen;
 325         fprintf(f, "P6\n%d %d\n%d\n",
 326             s->width, s->height, 255);
 327         for (y = 0; y < s->height; y++)
 328             for (x = 0; x < s->width; x++, data_buffer++) {
 329                 index = *data_buffer;
 330                 fputc(s->color_palette[index][0], f);
 331                 fputc(s->color_palette[index][1], f);
 332                 fputc(s->color_palette[index][2], f);
 333         }
 334     }
 335
 336     fclose(f);
 337 }
 338
 339 /* called for accesses to io ports */
 340 static uint32_t g364fb_ctrl_readl(void *opaque, target_phys_addr_t addr)
 341 {
 342     G364State *s = opaque;
 343     uint32_t val;
 344
 345     if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 346         /* cursor pattern */
 347         int idx = (addr - REG_CURS_PAT) >> 3;
 348         val = s->cursor[idx];
 349     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 350         /* cursor palette */
 351         int idx = (addr - REG_CURS_PAL) >> 3;
 352         val = ((uint32_t)s->cursor_palette[idx][0] << 16);
 353         val |= ((uint32_t)s->cursor_palette[idx][1] << 8);
 354         val |= ((uint32_t)s->cursor_palette[idx][2] << 0);
 355     } else {
 356         switch (addr) {
 357             case REG_ID:
 358                 val = 0x10; /* Mips G364 */
 359                 break;
 360             case REG_DISPLAY:
 361                 val = s->width / 4;
 362                 break;
 363             case REG_VDISPLAY:
 364                 val = s->height * 2;
 365                 break;
 366             case REG_CTLA:
 367                 val = s->ctla;
 368                 break;
 369             default:
 370             {
 371                 BADF("invalid read at [" TARGET_FMT_plx "]\n", addr);
 372                 val = 0;
 373                 break;
 374             }
 375         }
 376     }
 377
 378     DPRINTF("read 0x%08x at [" TARGET_FMT_plx "]\n", val, addr);
 379
 380     return val;
 381 }
 382
 383 static uint32_t g364fb_ctrl_readw(void *opaque, target_phys_addr_t addr)
 384 {
 385     uint32_t v = g364fb_ctrl_readl(opaque, addr & ~0x3);
 386     if (addr & 0x2)
 387         return v >> 16;
 388     else
 389         return v & 0xffff;
 390 }
 391
 392 static uint32_t g364fb_ctrl_readb(void *opaque, target_phys_addr_t addr)
 393 {
 394     uint32_t v = g364fb_ctrl_readl(opaque, addr & ~0x3);
 395     return (v >> (8 * (addr & 0x3))) & 0xff;
 396 }
 397
 398 static void g364fb_update_depth(G364State *s)
 399 {
 400     static const int depths[8] = { 1, 2, 4, 8, 15, 16, 0 };
 401     s->depth = depths[(s->ctla & 0x00700000) >> 20];
 402 }
 403
 404 static void g364_invalidate_cursor_position(G364State *s)
 405 {
 406     int ymin, ymax, start, end, i;
 407
 408     /* invalidate only near the cursor */
 409     ymin = s->cursor_position & 0xfff;
 410     ymax = MIN(s->height, ymin + 64);
 411     start = ymin * ds_get_linesize(s->ds);
 412     end = (ymax + 1) * ds_get_linesize(s->ds);
 413
 414     for (i = start; i < end; i += TARGET_PAGE_SIZE) {
 415         memory_region_set_dirty(&s->vram_region, i);
 416     }
 417 }
 418
 419 static void g364fb_ctrl_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
 420 {
 421     G364State *s = opaque;
 422
 423     DPRINTF("write 0x%08x at [" TARGET_FMT_plx "]\n", val, addr);
 424
 425     if (addr >= REG_CLR_PAL && addr < REG_CLR_PAL + 0x800) {
 426         /* color palette */
 427         int idx = (addr - REG_CLR_PAL) >> 3;
 428         s->color_palette[idx][0] = (val >> 16) & 0xff;
 429         s->color_palette[idx][1] = (val >> 8) & 0xff;
 430         s->color_palette[idx][2] = val & 0xff;
 431         g364fb_invalidate_display(s);
 432     } else if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 433         /* cursor pattern */
 434         int idx = (addr - REG_CURS_PAT) >> 3;
 435         s->cursor[idx] = val;
 436         g364fb_invalidate_display(s);
 437     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 438         /* cursor palette */
 439         int idx = (addr - REG_CURS_PAL) >> 3;
 440         s->cursor_palette[idx][0] = (val >> 16) & 0xff;
 441         s->cursor_palette[idx][1] = (val >> 8) & 0xff;
 442         s->cursor_palette[idx][2] = val & 0xff;
 443         g364fb_invalidate_display(s);
 444     } else {
 445         switch (addr) {
 446             case REG_ID: /* Card identifier; read-only */
 447             case REG_BOOT: /* Boot timing */
 448             case 0x80108: /* Line timing: half sync */
 449             case 0x80110: /* Line timing: back porch */
 450             case 0x80120: /* Line timing: short display */
 451             case 0x80128: /* Frame timing: broad pulse */
 452             case 0x80130: /* Frame timing: v sync */
 453             case 0x80138: /* Frame timing: v preequalise */
 454             case 0x80140: /* Frame timing: v postequalise */
 455             case 0x80148: /* Frame timing: v blank */
 456             case 0x80158: /* Line timing: line time */
 457             case 0x80160: /* Frame store: line start */
 458             case 0x80168: /* vram cycle: mem init */
 459             case 0x80170: /* vram cycle: transfer delay */
 460             case 0x80200: /* vram cycle: mask register */
 461                 /* ignore */
 462                 break;
 463             case REG_TOP:
 464                 s->top_of_screen = val;
 465                 g364fb_invalidate_display(s);
 466                 break;
 467             case REG_DISPLAY:
 468                 s->width = val * 4;
 469                 break;
 470             case REG_VDISPLAY:
 471                 s->height = val / 2;
 472                 break;
 473             case REG_CTLA:
 474                 s->ctla = val;
 475                 g364fb_update_depth(s);
 476                 g364fb_invalidate_display(s);
 477                 break;
 478             case REG_CURS_POS:
 479                 g364_invalidate_cursor_position(s);
 480                 s->cursor_position = val;
 481                 g364_invalidate_cursor_position(s);
 482                 break;
 483             case REG_RESET:
 484                 g364fb_reset(s);
 485                 break;
 486             default:
 487                 BADF("invalid write of 0x%08x at [" TARGET_FMT_plx "]\n", val, addr);
 488                 break;
 489         }
 490     }
 491     qemu_irq_lower(s->irq);
 492 }
 493
 494 static void g364fb_ctrl_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
 495 {
 496     uint32_t old_val = g364fb_ctrl_readl(opaque, addr & ~0x3);
 497
 498     if (addr & 0x2)
 499         val = (val << 16) | (old_val & 0x0000ffff);
 500     else
 501         val = val | (old_val & 0xffff0000);
 502     g364fb_ctrl_writel(opaque, addr & ~0x3, val);
 503 }
 504
 505 static void g364fb_ctrl_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
 506 {
 507     uint32_t old_val = g364fb_ctrl_readl(opaque, addr & ~0x3);
 508
 509     switch (addr & 3) {
 510     case 0:
 511         val = val | (old_val & 0xffffff00);
 512         break;
 513     case 1:
 514         val = (val << 8) | (old_val & 0xffff00ff);
 515         break;
 516     case 2:
 517         val = (val << 16) | (old_val & 0xff00ffff);
 518         break;
 519     case 3:
 520         val = (val << 24) | (old_val & 0x00ffffff);
 521         break;
 522     }
 523     g364fb_ctrl_writel(opaque, addr & ~0x3, val);
 524 }
 525
 526 static const MemoryRegionOps g364fb_ctrl_ops = {
 527     .old_mmio = {
 528         .read = {
 529             g364fb_ctrl_readb,
 530             g364fb_ctrl_readw,
 531             g364fb_ctrl_readl,
 532         },
 533         .write = {
 534             g364fb_ctrl_writeb,
 535             g364fb_ctrl_writew,
 536             g364fb_ctrl_writel,
 537         },
 538     },
 539     .endianness = DEVICE_NATIVE_ENDIAN,
 540 };
 541
 542 static int g364fb_load(QEMUFile *f, void *opaque, int version_id)
 543 {
 544     G364State *s = opaque;
 545     unsigned int i, vram_size;
 546
 547     if (version_id != 1)
 548         return -EINVAL;
 549
 550     vram_size = qemu_get_be32(f);
 551     if (vram_size < s->vram_size)
 552         return -EINVAL;
 553     qemu_get_buffer(f, s->vram, s->vram_size);
 554     for (i = 0; i < 256; i++)
 555         qemu_get_buffer(f, s->color_palette[i], 3);
 556     for (i = 0; i < 3; i++)
 557         qemu_get_buffer(f, s->cursor_palette[i], 3);
 558     qemu_get_buffer(f, (uint8_t *)s->cursor, sizeof(s->cursor));
 559     s->cursor_position = qemu_get_be32(f);
 560     s->ctla = qemu_get_be32(f);
 561     s->top_of_screen = qemu_get_be32(f);
 562     s->width = qemu_get_be32(f);
 563     s->height = qemu_get_be32(f);
 564
 565     /* force refresh */
 566     g364fb_update_depth(s);
 567     g364fb_invalidate_display(s);
 568
 569     return 0;
 570 }
 571
 572 static void g364fb_save(QEMUFile *f, void *opaque)
 573 {
 574     G364State *s = opaque;
 575     int i;
 576
 577     qemu_put_be32(f, s->vram_size);
 578     qemu_put_buffer(f, s->vram, s->vram_size);
 579     for (i = 0; i < 256; i++)
 580         qemu_put_buffer(f, s->color_palette[i], 3);
 581     for (i = 0; i < 3; i++)
 582         qemu_put_buffer(f, s->cursor_palette[i], 3);
 583     qemu_put_buffer(f, (uint8_t *)s->cursor, sizeof(s->cursor));
 584     qemu_put_be32(f, s->cursor_position);
 585     qemu_put_be32(f, s->ctla);
 586     qemu_put_be32(f, s->top_of_screen);
 587     qemu_put_be32(f, s->width);
 588     qemu_put_be32(f, s->height);
 589 }
 590
 591 int g364fb_mm_init(MemoryRegion *system_memory,
 592                    target_phys_addr_t vram_base,
 593                    target_phys_addr_t ctrl_base, int it_shift,
 594                    qemu_irq irq)
 595 {
 596     G364State *s;
 597     MemoryRegion *io_ctrl = g_new(MemoryRegion, 1);
 598
 599     s = g_malloc0(sizeof(G364State));
 600
 601     s->vram_size = 8 * 1024 * 1024;
 602     memory_region_init_ram(&s->vram_region, NULL, "g364fb.vram", s->vram_size);
 603     s->vram = memory_region_get_ram_ptr(&s->vram_region);
 604     s->irq = irq;
 605
 606     qemu_register_reset(g364fb_reset, s);
 607     register_savevm(NULL, "g364fb", 0, 1, g364fb_save, g364fb_load, s);
 608     g364fb_reset(s);
 609
 610     s->ds = graphic_console_init(g364fb_update_display,
 611                                  g364fb_invalidate_display,
 612                                  g364fb_screen_dump, NULL, s);
 613
 614     memory_region_add_subregion(system_memory, vram_base, &s->vram_region);
 615
 616     memory_region_init_io(io_ctrl, &g364fb_ctrl_ops, s,
 617                           "g364fb-ctrl", 0x200000);
 618     memory_region_add_subregion(system_memory, ctrl_base, io_ctrl);
 619
 620     return 0;
 621 }