hw/g364fb.c

   1 /*
   2  * QEMU G364 framebuffer Emulator.
   3  *
   4  * Copyright (c) 2007-2011 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 "console.h"
  22 #include "pixel_ops.h"
  23 #include "trace.h"
  24 #include "sysbus.h"
  25
  26 typedef struct G364State {
  27     /* hardware */
  28     uint8_t *vram;
  29     uint32_t vram_size;
  30     qemu_irq irq;
  31     MemoryRegion mem_vram;
  32     MemoryRegion mem_ctrl;
  33     /* registers */
  34     uint8_t color_palette[256][3];
  35     uint8_t cursor_palette[3][3];
  36     uint16_t cursor[512];
  37     uint32_t cursor_position;
  38     uint32_t ctla;
  39     uint32_t top_of_screen;
  40     uint32_t width, height; /* in pixels */
  41     /* display refresh support */
  42     DisplayState *ds;
  43     int depth;
  44     int blanked;
  45 } G364State;
  46
  47 #define REG_BOOT     0x000000
  48 #define REG_DISPLAY  0x000118
  49 #define REG_VDISPLAY 0x000150
  50 #define REG_CTLA     0x000300
  51 #define REG_TOP      0x000400
  52 #define REG_CURS_PAL 0x000508
  53 #define REG_CURS_POS 0x000638
  54 #define REG_CLR_PAL  0x000800
  55 #define REG_CURS_PAT 0x001000
  56 #define REG_RESET    0x100000
  57
  58 #define CTLA_FORCE_BLANK 0x00000400
  59 #define CTLA_NO_CURSOR   0x00800000
  60
  61 #define G364_PAGE_SIZE 4096
  62
  63 static inline int check_dirty(G364State *s, ram_addr_t page)
  64 {
  65     return memory_region_get_dirty(&s->mem_vram, page, G364_PAGE_SIZE,
  66                                    DIRTY_MEMORY_VGA);
  67 }
  68
  69 static inline void reset_dirty(G364State *s,
  70                                ram_addr_t page_min, ram_addr_t page_max)
  71 {
  72     memory_region_reset_dirty(&s->mem_vram,
  73                               page_min,
  74                               page_max + G364_PAGE_SIZE - page_min - 1,
  75                               DIRTY_MEMORY_VGA);
  76 }
  77
  78 static void g364fb_draw_graphic8(G364State *s)
  79 {
  80     int i, w;
  81     uint8_t *vram;
  82     uint8_t *data_display, *dd;
  83     ram_addr_t page, page_min, page_max;
  84     int x, y;
  85     int xmin, xmax;
  86     int ymin, ymax;
  87     int xcursor, ycursor;
  88     unsigned int (*rgb_to_pixel)(unsigned int r, unsigned int g, unsigned int b);
  89
  90     switch (ds_get_bits_per_pixel(s->ds)) {
  91         case 8:
  92             rgb_to_pixel = rgb_to_pixel8;
  93             w = 1;
  94             break;
  95         case 15:
  96             rgb_to_pixel = rgb_to_pixel15;
  97             w = 2;
  98             break;
  99         case 16:
 100             rgb_to_pixel = rgb_to_pixel16;
 101             w = 2;
 102             break;
 103         case 32:
 104             rgb_to_pixel = rgb_to_pixel32;
 105             w = 4;
 106             break;
 107         default:
 108             hw_error("g364: unknown host depth %d",
 109                      ds_get_bits_per_pixel(s->ds));
 110             return;
 111     }
 112
 113     page = 0;
 114     page_min = (ram_addr_t)-1;
 115     page_max = 0;
 116
 117     x = y = 0;
 118     xmin = s->width;
 119     xmax = 0;
 120     ymin = s->height;
 121     ymax = 0;
 122
 123     if (!(s->ctla & CTLA_NO_CURSOR)) {
 124         xcursor = s->cursor_position >> 12;
 125         ycursor = s->cursor_position & 0xfff;
 126     } else {
 127         xcursor = ycursor = -65;
 128     }
 129
 130     vram = s->vram + s->top_of_screen;
 131     /* XXX: out of range in vram? */
 132     data_display = dd = ds_get_data(s->ds);
 133     while (y < s->height) {
 134         if (check_dirty(s, page)) {
 135             if (y < ymin)
 136                 ymin = ymax = y;
 137             if (page_min == (ram_addr_t)-1)
 138                 page_min = page;
 139             page_max = page;
 140             if (x < xmin)
 141                 xmin = x;
 142             for (i = 0; i < G364_PAGE_SIZE; i++) {
 143                 uint8_t index;
 144                 unsigned int color;
 145                 if (unlikely((y >= ycursor && y < ycursor + 64) &&
 146                     (x >= xcursor && x < xcursor + 64))) {
 147                     /* pointer area */
 148                     int xdiff = x - xcursor;
 149                     uint16_t curs = s->cursor[(y - ycursor) * 8 + xdiff / 8];
 150                     int op = (curs >> ((xdiff & 7) * 2)) & 3;
 151                     if (likely(op == 0)) {
 152                         /* transparent */
 153                         index = *vram;
 154                         color = (*rgb_to_pixel)(
 155                             s->color_palette[index][0],
 156                             s->color_palette[index][1],
 157                             s->color_palette[index][2]);
 158                     } else {
 159                         /* get cursor color */
 160                         index = op - 1;
 161                         color = (*rgb_to_pixel)(
 162                             s->cursor_palette[index][0],
 163                             s->cursor_palette[index][1],
 164                             s->cursor_palette[index][2]);
 165                     }
 166                 } else {
 167                     /* normal area */
 168                     index = *vram;
 169                     color = (*rgb_to_pixel)(
 170                         s->color_palette[index][0],
 171                         s->color_palette[index][1],
 172                         s->color_palette[index][2]);
 173                 }
 174                 memcpy(dd, &color, w);
 175                 dd += w;
 176                 x++;
 177                 vram++;
 178                 if (x == s->width) {
 179                     xmax = s->width - 1;
 180                     y++;
 181                     if (y == s->height) {
 182                         ymax = s->height - 1;
 183                         goto done;
 184                     }
 185                     data_display = dd = data_display + ds_get_linesize(s->ds);
 186                     xmin = 0;
 187                     x = 0;
 188                 }
 189             }
 190             if (x > xmax)
 191                 xmax = x;
 192             if (y > ymax)
 193                 ymax = y;
 194         } else {
 195             int dy;
 196             if (page_min != (ram_addr_t)-1) {
 197                 reset_dirty(s, page_min, page_max);
 198                 page_min = (ram_addr_t)-1;
 199                 page_max = 0;
 200                 dpy_gfx_update(s->ds, xmin, ymin,
 201                                xmax - xmin + 1, ymax - ymin + 1);
 202                 xmin = s->width;
 203                 xmax = 0;
 204                 ymin = s->height;
 205                 ymax = 0;
 206             }
 207             x += G364_PAGE_SIZE;
 208             dy = x / s->width;
 209             x = x % s->width;
 210             y += dy;
 211             vram += G364_PAGE_SIZE;
 212             data_display += dy * ds_get_linesize(s->ds);
 213             dd = data_display + x * w;
 214         }
 215         page += G364_PAGE_SIZE;
 216     }
 217
 218 done:
 219     if (page_min != (ram_addr_t)-1) {
 220         dpy_gfx_update(s->ds, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 221         reset_dirty(s, page_min, page_max);
 222     }
 223 }
 224
 225 static void g364fb_draw_blank(G364State *s)
 226 {
 227     int i, w;
 228     uint8_t *d;
 229
 230     if (s->blanked) {
 231         /* Screen is already blank. No need to redraw it */
 232         return;
 233     }
 234
 235     w = s->width * ((ds_get_bits_per_pixel(s->ds) + 7) >> 3);
 236     d = ds_get_data(s->ds);
 237     for (i = 0; i < s->height; i++) {
 238         memset(d, 0, w);
 239         d += ds_get_linesize(s->ds);
 240     }
 241
 242     dpy_gfx_update(s->ds, 0, 0, s->width, s->height);
 243     s->blanked = 1;
 244 }
 245
 246 static void g364fb_update_display(void *opaque)
 247 {
 248     G364State *s = opaque;
 249
 250     qemu_flush_coalesced_mmio_buffer();
 251
 252     if (s->width == 0 || s->height == 0)
 253         return;
 254
 255     if (s->width != ds_get_width(s->ds) || s->height != ds_get_height(s->ds)) {
 256         qemu_console_resize(s->ds, s->width, s->height);
 257     }
 258
 259     if (s->ctla & CTLA_FORCE_BLANK) {
 260         g364fb_draw_blank(s);
 261     } else if (s->depth == 8) {
 262         g364fb_draw_graphic8(s);
 263     } else {
 264         error_report("g364: unknown guest depth %d", s->depth);
 265     }
 266
 267     qemu_irq_raise(s->irq);
 268 }
 269
 270 static inline void g364fb_invalidate_display(void *opaque)
 271 {
 272     G364State *s = opaque;
 273
 274     s->blanked = 0;
 275     memory_region_set_dirty(&s->mem_vram, 0, s->vram_size);
 276 }
 277
 278 static void g364fb_reset(G364State *s)
 279 {
 280     qemu_irq_lower(s->irq);
 281
 282     memset(s->color_palette, 0, sizeof(s->color_palette));
 283     memset(s->cursor_palette, 0, sizeof(s->cursor_palette));
 284     memset(s->cursor, 0, sizeof(s->cursor));
 285     s->cursor_position = 0;
 286     s->ctla = 0;
 287     s->top_of_screen = 0;
 288     s->width = s->height = 0;
 289     memset(s->vram, 0, s->vram_size);
 290     g364fb_invalidate_display(s);
 291 }
 292
 293 static void g364fb_screen_dump(void *opaque, const char *filename, bool cswitch,
 294                                Error **errp)
 295 {
 296     G364State *s = opaque;
 297     int ret, y, x;
 298     uint8_t index;
 299     uint8_t *data_buffer;
 300     FILE *f;
 301
 302     qemu_flush_coalesced_mmio_buffer();
 303
 304     if (s->depth != 8) {
 305         error_setg(errp, "g364: unknown guest depth %d", s->depth);
 306         return;
 307     }
 308
 309     f = fopen(filename, "wb");
 310     if (!f) {
 311         error_setg(errp, "failed to open file '%s': %s", filename,
 312                    strerror(errno));
 313         return;
 314     }
 315
 316     if (s->ctla & CTLA_FORCE_BLANK) {
 317         /* blank screen */
 318         ret = fprintf(f, "P4\n%d %d\n", s->width, s->height);
 319         if (ret < 0) {
 320             goto write_err;
 321         }
 322         for (y = 0; y < s->height; y++)
 323             for (x = 0; x < s->width; x++) {
 324                 ret = fputc(0, f);
 325                 if (ret == EOF) {
 326                     goto write_err;
 327                 }
 328             }
 329     } else {
 330         data_buffer = s->vram + s->top_of_screen;
 331         ret = fprintf(f, "P6\n%d %d\n%d\n", s->width, s->height, 255);
 332         if (ret < 0) {
 333             goto write_err;
 334         }
 335         for (y = 0; y < s->height; y++)
 336             for (x = 0; x < s->width; x++, data_buffer++) {
 337                 index = *data_buffer;
 338                 ret = fputc(s->color_palette[index][0], f);
 339                 if (ret == EOF) {
 340                     goto write_err;
 341                 }
 342                 ret = fputc(s->color_palette[index][1], f);
 343                 if (ret == EOF) {
 344                     goto write_err;
 345                 }
 346                 ret = fputc(s->color_palette[index][2], f);
 347                 if (ret == EOF) {
 348                     goto write_err;
 349                 }
 350         }
 351     }
 352
 353 out:
 354     fclose(f);
 355     return;
 356
 357 write_err:
 358     error_setg(errp, "failed to write to file '%s': %s", filename,
 359                strerror(errno));
 360     unlink(filename);
 361     goto out;
 362 }
 363
 364 /* called for accesses to io ports */
 365 static uint64_t g364fb_ctrl_read(void *opaque,
 366                                  hwaddr addr,
 367                                  unsigned int size)
 368 {
 369     G364State *s = opaque;
 370     uint32_t val;
 371
 372     if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 373         /* cursor pattern */
 374         int idx = (addr - REG_CURS_PAT) >> 3;
 375         val = s->cursor[idx];
 376     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 377         /* cursor palette */
 378         int idx = (addr - REG_CURS_PAL) >> 3;
 379         val = ((uint32_t)s->cursor_palette[idx][0] << 16);
 380         val |= ((uint32_t)s->cursor_palette[idx][1] << 8);
 381         val |= ((uint32_t)s->cursor_palette[idx][2] << 0);
 382     } else {
 383         switch (addr) {
 384             case REG_DISPLAY:
 385                 val = s->width / 4;
 386                 break;
 387             case REG_VDISPLAY:
 388                 val = s->height * 2;
 389                 break;
 390             case REG_CTLA:
 391                 val = s->ctla;
 392                 break;
 393             default:
 394             {
 395                 error_report("g364: invalid read at [" TARGET_FMT_plx "]",
 396                              addr);
 397                 val = 0;
 398                 break;
 399             }
 400         }
 401     }
 402
 403     trace_g364fb_read(addr, val);
 404
 405     return val;
 406 }
 407
 408 static void g364fb_update_depth(G364State *s)
 409 {
 410     static const int depths[8] = { 1, 2, 4, 8, 15, 16, 0 };
 411     s->depth = depths[(s->ctla & 0x00700000) >> 20];
 412 }
 413
 414 static void g364_invalidate_cursor_position(G364State *s)
 415 {
 416     int ymin, ymax, start, end;
 417
 418     /* invalidate only near the cursor */
 419     ymin = s->cursor_position & 0xfff;
 420     ymax = MIN(s->height, ymin + 64);
 421     start = ymin * ds_get_linesize(s->ds);
 422     end = (ymax + 1) * ds_get_linesize(s->ds);
 423
 424     memory_region_set_dirty(&s->mem_vram, start, end - start);
 425 }
 426
 427 static void g364fb_ctrl_write(void *opaque,
 428                               hwaddr addr,
 429                               uint64_t val,
 430                               unsigned int size)
 431 {
 432     G364State *s = opaque;
 433
 434     trace_g364fb_write(addr, val);
 435
 436     if (addr >= REG_CLR_PAL && addr < REG_CLR_PAL + 0x800) {
 437         /* color palette */
 438         int idx = (addr - REG_CLR_PAL) >> 3;
 439         s->color_palette[idx][0] = (val >> 16) & 0xff;
 440         s->color_palette[idx][1] = (val >> 8) & 0xff;
 441         s->color_palette[idx][2] = val & 0xff;
 442         g364fb_invalidate_display(s);
 443     } else if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 444         /* cursor pattern */
 445         int idx = (addr - REG_CURS_PAT) >> 3;
 446         s->cursor[idx] = val;
 447         g364fb_invalidate_display(s);
 448     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 449         /* cursor palette */
 450         int idx = (addr - REG_CURS_PAL) >> 3;
 451         s->cursor_palette[idx][0] = (val >> 16) & 0xff;
 452         s->cursor_palette[idx][1] = (val >> 8) & 0xff;
 453         s->cursor_palette[idx][2] = val & 0xff;
 454         g364fb_invalidate_display(s);
 455     } else {
 456         switch (addr) {
 457         case REG_BOOT: /* Boot timing */
 458         case 0x00108: /* Line timing: half sync */
 459         case 0x00110: /* Line timing: back porch */
 460         case 0x00120: /* Line timing: short display */
 461         case 0x00128: /* Frame timing: broad pulse */
 462         case 0x00130: /* Frame timing: v sync */
 463         case 0x00138: /* Frame timing: v preequalise */
 464         case 0x00140: /* Frame timing: v postequalise */
 465         case 0x00148: /* Frame timing: v blank */
 466         case 0x00158: /* Line timing: line time */
 467         case 0x00160: /* Frame store: line start */
 468         case 0x00168: /* vram cycle: mem init */
 469         case 0x00170: /* vram cycle: transfer delay */
 470         case 0x00200: /* vram cycle: mask register */
 471             /* ignore */
 472             break;
 473         case REG_TOP:
 474             s->top_of_screen = val;
 475             g364fb_invalidate_display(s);
 476             break;
 477         case REG_DISPLAY:
 478             s->width = val * 4;
 479             break;
 480         case REG_VDISPLAY:
 481             s->height = val / 2;
 482             break;
 483         case REG_CTLA:
 484             s->ctla = val;
 485             g364fb_update_depth(s);
 486             g364fb_invalidate_display(s);
 487             break;
 488         case REG_CURS_POS:
 489             g364_invalidate_cursor_position(s);
 490             s->cursor_position = val;
 491             g364_invalidate_cursor_position(s);
 492             break;
 493         case REG_RESET:
 494             g364fb_reset(s);
 495             break;
 496         default:
 497             error_report("g364: invalid write of 0x%" PRIx64
 498                          " at [" TARGET_FMT_plx "]", val, addr);
 499             break;
 500         }
 501     }
 502     qemu_irq_lower(s->irq);
 503 }
 504
 505 static const MemoryRegionOps g364fb_ctrl_ops = {
 506     .read = g364fb_ctrl_read,
 507     .write = g364fb_ctrl_write,
 508     .endianness = DEVICE_LITTLE_ENDIAN,
 509     .impl.min_access_size = 4,
 510     .impl.max_access_size = 4,
 511 };
 512
 513 static int g364fb_post_load(void *opaque, int version_id)
 514 {
 515     G364State *s = opaque;
 516
 517     /* force refresh */
 518     g364fb_update_depth(s);
 519     g364fb_invalidate_display(s);
 520
 521     return 0;
 522 }
 523
 524 static const VMStateDescription vmstate_g364fb = {
 525     .name = "g364fb",
 526     .version_id = 1,
 527     .minimum_version_id = 1,
 528     .minimum_version_id_old = 1,
 529     .post_load = g364fb_post_load,
 530     .fields = (VMStateField[]) {
 531         VMSTATE_VBUFFER_UINT32(vram, G364State, 1, NULL, 0, vram_size),
 532         VMSTATE_BUFFER_UNSAFE(color_palette, G364State, 0, 256 * 3),
 533         VMSTATE_BUFFER_UNSAFE(cursor_palette, G364State, 0, 9),
 534         VMSTATE_UINT16_ARRAY(cursor, G364State, 512),
 535         VMSTATE_UINT32(cursor_position, G364State),
 536         VMSTATE_UINT32(ctla, G364State),
 537         VMSTATE_UINT32(top_of_screen, G364State),
 538         VMSTATE_UINT32(width, G364State),
 539         VMSTATE_UINT32(height, G364State),
 540         VMSTATE_END_OF_LIST()
 541     }
 542 };
 543
 544 static void g364fb_init(DeviceState *dev, G364State *s)
 545 {
 546     s->vram = g_malloc0(s->vram_size);
 547
 548     s->ds = graphic_console_init(g364fb_update_display,
 549                                  g364fb_invalidate_display,
 550                                  g364fb_screen_dump, NULL, s);
 551
 552     memory_region_init_io(&s->mem_ctrl, &g364fb_ctrl_ops, s, "ctrl", 0x180000);
 553     memory_region_init_ram_ptr(&s->mem_vram, "vram",
 554                                s->vram_size, s->vram);
 555     vmstate_register_ram(&s->mem_vram, dev);
 556     memory_region_set_coalescing(&s->mem_vram);
 557 }
 558
 559 typedef struct {
 560     SysBusDevice busdev;
 561     G364State g364;
 562 } G364SysBusState;
 563
 564 static int g364fb_sysbus_init(SysBusDevice *dev)
 565 {
 566     G364State *s = &FROM_SYSBUS(G364SysBusState, dev)->g364;
 567
 568     g364fb_init(&dev->qdev, s);
 569     sysbus_init_irq(dev, &s->irq);
 570     sysbus_init_mmio(dev, &s->mem_ctrl);
 571     sysbus_init_mmio(dev, &s->mem_vram);
 572
 573     return 0;
 574 }
 575
 576 static void g364fb_sysbus_reset(DeviceState *d)
 577 {
 578     G364SysBusState *s = DO_UPCAST(G364SysBusState, busdev.qdev, d);
 579     g364fb_reset(&s->g364);
 580 }
 581
 582 static Property g364fb_sysbus_properties[] = {
 583     DEFINE_PROP_HEX32("vram_size", G364SysBusState, g364.vram_size,
 584     8 * 1024 * 1024),
 585     DEFINE_PROP_END_OF_LIST(),
 586 };
 587
 588 static void g364fb_sysbus_class_init(ObjectClass *klass, void *data)
 589 {
 590     DeviceClass *dc = DEVICE_CLASS(klass);
 591     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 592
 593     k->init = g364fb_sysbus_init;
 594     dc->desc = "G364 framebuffer";
 595     dc->reset = g364fb_sysbus_reset;
 596     dc->vmsd = &vmstate_g364fb;
 597     dc->props = g364fb_sysbus_properties;
 598 }
 599
 600 static TypeInfo g364fb_sysbus_info = {
 601     .name          = "sysbus-g364",
 602     .parent        = TYPE_SYS_BUS_DEVICE,
 603     .instance_size = sizeof(G364SysBusState),
 604     .class_init    = g364fb_sysbus_class_init,
 605 };
 606
 607 static void g364fb_register_types(void)
 608 {
 609     type_register_static(&g364fb_sysbus_info);
 610 }
 611
 612 type_init(g364fb_register_types)