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 static inline int check_dirty(G364State *s, ram_addr_t page)
  62 {
  63     return memory_region_get_dirty(&s->mem_vram, page, DIRTY_MEMORY_VGA);
  64 }
  65
  66 static inline void reset_dirty(G364State *s,
  67                                ram_addr_t page_min, ram_addr_t page_max)
  68 {
  69     memory_region_reset_dirty(&s->mem_vram,
  70                               page_min,
  71                               page_max + TARGET_PAGE_SIZE - page_min - 1,
  72                               DIRTY_MEMORY_VGA);
  73 }
  74
  75 static void g364fb_draw_graphic8(G364State *s)
  76 {
  77     int i, w;
  78     uint8_t *vram;
  79     uint8_t *data_display, *dd;
  80     ram_addr_t page, page_min, page_max;
  81     int x, y;
  82     int xmin, xmax;
  83     int ymin, ymax;
  84     int xcursor, ycursor;
  85     unsigned int (*rgb_to_pixel)(unsigned int r, unsigned int g, unsigned int b);
  86
  87     switch (ds_get_bits_per_pixel(s->ds)) {
  88         case 8:
  89             rgb_to_pixel = rgb_to_pixel8;
  90             w = 1;
  91             break;
  92         case 15:
  93             rgb_to_pixel = rgb_to_pixel15;
  94             w = 2;
  95             break;
  96         case 16:
  97             rgb_to_pixel = rgb_to_pixel16;
  98             w = 2;
  99             break;
 100         case 32:
 101             rgb_to_pixel = rgb_to_pixel32;
 102             w = 4;
 103             break;
 104         default:
 105             hw_error("g364: unknown host depth %d",
 106                      ds_get_bits_per_pixel(s->ds));
 107             return;
 108     }
 109
 110     page = 0;
 111     page_min = (ram_addr_t)-1;
 112     page_max = 0;
 113
 114     x = y = 0;
 115     xmin = s->width;
 116     xmax = 0;
 117     ymin = s->height;
 118     ymax = 0;
 119
 120     if (!(s->ctla & CTLA_NO_CURSOR)) {
 121         xcursor = s->cursor_position >> 12;
 122         ycursor = s->cursor_position & 0xfff;
 123     } else {
 124         xcursor = ycursor = -65;
 125     }
 126
 127     vram = s->vram + s->top_of_screen;
 128     /* XXX: out of range in vram? */
 129     data_display = dd = ds_get_data(s->ds);
 130     while (y < s->height) {
 131         if (check_dirty(s, page)) {
 132             if (y < ymin)
 133                 ymin = ymax = y;
 134             if (page_min == (ram_addr_t)-1)
 135                 page_min = page;
 136             page_max = page;
 137             if (x < xmin)
 138                 xmin = x;
 139             for (i = 0; i < TARGET_PAGE_SIZE; i++) {
 140                 uint8_t index;
 141                 unsigned int color;
 142                 if (unlikely((y >= ycursor && y < ycursor + 64) &&
 143                     (x >= xcursor && x < xcursor + 64))) {
 144                     /* pointer area */
 145                     int xdiff = x - xcursor;
 146                     uint16_t curs = s->cursor[(y - ycursor) * 8 + xdiff / 8];
 147                     int op = (curs >> ((xdiff & 7) * 2)) & 3;
 148                     if (likely(op == 0)) {
 149                         /* transparent */
 150                         index = *vram;
 151                         color = (*rgb_to_pixel)(
 152                             s->color_palette[index][0],
 153                             s->color_palette[index][1],
 154                             s->color_palette[index][2]);
 155                     } else {
 156                         /* get cursor color */
 157                         index = op - 1;
 158                         color = (*rgb_to_pixel)(
 159                             s->cursor_palette[index][0],
 160                             s->cursor_palette[index][1],
 161                             s->cursor_palette[index][2]);
 162                     }
 163                 } else {
 164                     /* normal area */
 165                     index = *vram;
 166                     color = (*rgb_to_pixel)(
 167                         s->color_palette[index][0],
 168                         s->color_palette[index][1],
 169                         s->color_palette[index][2]);
 170                 }
 171                 memcpy(dd, &color, w);
 172                 dd += w;
 173                 x++;
 174                 vram++;
 175                 if (x == s->width) {
 176                     xmax = s->width - 1;
 177                     y++;
 178                     if (y == s->height) {
 179                         ymax = s->height - 1;
 180                         goto done;
 181                     }
 182                     data_display = dd = data_display + ds_get_linesize(s->ds);
 183                     xmin = 0;
 184                     x = 0;
 185                 }
 186             }
 187             if (x > xmax)
 188                 xmax = x;
 189             if (y > ymax)
 190                 ymax = y;
 191         } else {
 192             int dy;
 193             if (page_min != (ram_addr_t)-1) {
 194                 reset_dirty(s, page_min, page_max);
 195                 page_min = (ram_addr_t)-1;
 196                 page_max = 0;
 197                 dpy_update(s->ds, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 198                 xmin = s->width;
 199                 xmax = 0;
 200                 ymin = s->height;
 201                 ymax = 0;
 202             }
 203             x += TARGET_PAGE_SIZE;
 204             dy = x / s->width;
 205             x = x % s->width;
 206             y += dy;
 207             vram += TARGET_PAGE_SIZE;
 208             data_display += dy * ds_get_linesize(s->ds);
 209             dd = data_display + x * w;
 210         }
 211         page += TARGET_PAGE_SIZE;
 212     }
 213
 214 done:
 215     if (page_min != (ram_addr_t)-1) {
 216         dpy_update(s->ds, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 217         reset_dirty(s, page_min, page_max);
 218     }
 219 }
 220
 221 static void g364fb_draw_blank(G364State *s)
 222 {
 223     int i, w;
 224     uint8_t *d;
 225
 226     if (s->blanked) {
 227         /* Screen is already blank. No need to redraw it */
 228         return;
 229     }
 230
 231     w = s->width * ((ds_get_bits_per_pixel(s->ds) + 7) >> 3);
 232     d = ds_get_data(s->ds);
 233     for (i = 0; i < s->height; i++) {
 234         memset(d, 0, w);
 235         d += ds_get_linesize(s->ds);
 236     }
 237
 238     dpy_update(s->ds, 0, 0, s->width, s->height);
 239     s->blanked = 1;
 240 }
 241
 242 static void g364fb_update_display(void *opaque)
 243 {
 244     G364State *s = opaque;
 245
 246     if (s->width == 0 || s->height == 0)
 247         return;
 248
 249     if (s->width != ds_get_width(s->ds) || s->height != ds_get_height(s->ds)) {
 250         qemu_console_resize(s->ds, s->width, s->height);
 251     }
 252
 253     if (s->ctla & CTLA_FORCE_BLANK) {
 254         g364fb_draw_blank(s);
 255     } else if (s->depth == 8) {
 256         g364fb_draw_graphic8(s);
 257     } else {
 258         error_report("g364: unknown guest depth %d", s->depth);
 259     }
 260
 261     qemu_irq_raise(s->irq);
 262 }
 263
 264 static inline void g364fb_invalidate_display(void *opaque)
 265 {
 266     G364State *s = opaque;
 267     int i;
 268
 269     s->blanked = 0;
 270     for (i = 0; i < s->vram_size; i += TARGET_PAGE_SIZE) {
 271         memory_region_set_dirty(&s->mem_vram, i);
 272     }
 273 }
 274
 275 static void g364fb_reset(G364State *s)
 276 {
 277     qemu_irq_lower(s->irq);
 278
 279     memset(s->color_palette, 0, sizeof(s->color_palette));
 280     memset(s->cursor_palette, 0, sizeof(s->cursor_palette));
 281     memset(s->cursor, 0, sizeof(s->cursor));
 282     s->cursor_position = 0;
 283     s->ctla = 0;
 284     s->top_of_screen = 0;
 285     s->width = s->height = 0;
 286     memset(s->vram, 0, s->vram_size);
 287     g364fb_invalidate_display(s);
 288 }
 289
 290 static void g364fb_screen_dump(void *opaque, const char *filename)
 291 {
 292     G364State *s = opaque;
 293     int y, x;
 294     uint8_t index;
 295     uint8_t *data_buffer;
 296     FILE *f;
 297
 298     if (s->depth != 8) {
 299         error_report("g364: unknown guest depth %d", s->depth);
 300         return;
 301     }
 302
 303     f = fopen(filename, "wb");
 304     if (!f)
 305         return;
 306
 307     if (s->ctla & CTLA_FORCE_BLANK) {
 308         /* blank screen */
 309         fprintf(f, "P4\n%d %d\n",
 310             s->width, s->height);
 311         for (y = 0; y < s->height; y++)
 312             for (x = 0; x < s->width; x++)
 313                 fputc(0, f);
 314     } else {
 315         data_buffer = s->vram + s->top_of_screen;
 316         fprintf(f, "P6\n%d %d\n%d\n",
 317             s->width, s->height, 255);
 318         for (y = 0; y < s->height; y++)
 319             for (x = 0; x < s->width; x++, data_buffer++) {
 320                 index = *data_buffer;
 321                 fputc(s->color_palette[index][0], f);
 322                 fputc(s->color_palette[index][1], f);
 323                 fputc(s->color_palette[index][2], f);
 324         }
 325     }
 326
 327     fclose(f);
 328 }
 329
 330 /* called for accesses to io ports */
 331 static uint64_t g364fb_ctrl_read(void *opaque,
 332                                  target_phys_addr_t addr,
 333                                  unsigned int size)
 334 {
 335     G364State *s = opaque;
 336     uint32_t val;
 337
 338     if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 339         /* cursor pattern */
 340         int idx = (addr - REG_CURS_PAT) >> 3;
 341         val = s->cursor[idx];
 342     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 343         /* cursor palette */
 344         int idx = (addr - REG_CURS_PAL) >> 3;
 345         val = ((uint32_t)s->cursor_palette[idx][0] << 16);
 346         val |= ((uint32_t)s->cursor_palette[idx][1] << 8);
 347         val |= ((uint32_t)s->cursor_palette[idx][2] << 0);
 348     } else {
 349         switch (addr) {
 350             case REG_DISPLAY:
 351                 val = s->width / 4;
 352                 break;
 353             case REG_VDISPLAY:
 354                 val = s->height * 2;
 355                 break;
 356             case REG_CTLA:
 357                 val = s->ctla;
 358                 break;
 359             default:
 360             {
 361                 error_report("g364: invalid read at [" TARGET_FMT_plx "]",
 362                              addr);
 363                 val = 0;
 364                 break;
 365             }
 366         }
 367     }
 368
 369     trace_g364fb_read(addr, val);
 370
 371     return val;
 372 }
 373
 374 static void g364fb_update_depth(G364State *s)
 375 {
 376     static const int depths[8] = { 1, 2, 4, 8, 15, 16, 0 };
 377     s->depth = depths[(s->ctla & 0x00700000) >> 20];
 378 }
 379
 380 static void g364_invalidate_cursor_position(G364State *s)
 381 {
 382     int ymin, ymax, start, end, i;
 383
 384     /* invalidate only near the cursor */
 385     ymin = s->cursor_position & 0xfff;
 386     ymax = MIN(s->height, ymin + 64);
 387     start = ymin * ds_get_linesize(s->ds);
 388     end = (ymax + 1) * ds_get_linesize(s->ds);
 389
 390     for (i = start; i < end; i += TARGET_PAGE_SIZE) {
 391         memory_region_set_dirty(&s->mem_vram, i);
 392     }
 393 }
 394
 395 static void g364fb_ctrl_write(void *opaque,
 396                               target_phys_addr_t addr,
 397                               uint64_t val,
 398                               unsigned int size)
 399 {
 400     G364State *s = opaque;
 401
 402     trace_g364fb_write(addr, val);
 403
 404     if (addr >= REG_CLR_PAL && addr < REG_CLR_PAL + 0x800) {
 405         /* color palette */
 406         int idx = (addr - REG_CLR_PAL) >> 3;
 407         s->color_palette[idx][0] = (val >> 16) & 0xff;
 408         s->color_palette[idx][1] = (val >> 8) & 0xff;
 409         s->color_palette[idx][2] = val & 0xff;
 410         g364fb_invalidate_display(s);
 411     } else if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 412         /* cursor pattern */
 413         int idx = (addr - REG_CURS_PAT) >> 3;
 414         s->cursor[idx] = val;
 415         g364fb_invalidate_display(s);
 416     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 417         /* cursor palette */
 418         int idx = (addr - REG_CURS_PAL) >> 3;
 419         s->cursor_palette[idx][0] = (val >> 16) & 0xff;
 420         s->cursor_palette[idx][1] = (val >> 8) & 0xff;
 421         s->cursor_palette[idx][2] = val & 0xff;
 422         g364fb_invalidate_display(s);
 423     } else {
 424         switch (addr) {
 425         case REG_BOOT: /* Boot timing */
 426         case 0x00108: /* Line timing: half sync */
 427         case 0x00110: /* Line timing: back porch */
 428         case 0x00120: /* Line timing: short display */
 429         case 0x00128: /* Frame timing: broad pulse */
 430         case 0x00130: /* Frame timing: v sync */
 431         case 0x00138: /* Frame timing: v preequalise */
 432         case 0x00140: /* Frame timing: v postequalise */
 433         case 0x00148: /* Frame timing: v blank */
 434         case 0x00158: /* Line timing: line time */
 435         case 0x00160: /* Frame store: line start */
 436         case 0x00168: /* vram cycle: mem init */
 437         case 0x00170: /* vram cycle: transfer delay */
 438         case 0x00200: /* vram cycle: mask register */
 439             /* ignore */
 440             break;
 441         case REG_TOP:
 442             s->top_of_screen = val;
 443             g364fb_invalidate_display(s);
 444             break;
 445         case REG_DISPLAY:
 446             s->width = val * 4;
 447             break;
 448         case REG_VDISPLAY:
 449             s->height = val / 2;
 450             break;
 451         case REG_CTLA:
 452             s->ctla = val;
 453             g364fb_update_depth(s);
 454             g364fb_invalidate_display(s);
 455             break;
 456         case REG_CURS_POS:
 457             g364_invalidate_cursor_position(s);
 458             s->cursor_position = val;
 459             g364_invalidate_cursor_position(s);
 460             break;
 461         case REG_RESET:
 462             g364fb_reset(s);
 463             break;
 464         default:
 465             error_report("g364: invalid write of 0x%" PRIx64
 466                          " at [" TARGET_FMT_plx "]", val, addr);
 467             break;
 468         }
 469     }
 470     qemu_irq_lower(s->irq);
 471 }
 472
 473 static const MemoryRegionOps g364fb_ctrl_ops = {
 474     .read = g364fb_ctrl_read,
 475     .write = g364fb_ctrl_write,
 476     .endianness = DEVICE_LITTLE_ENDIAN,
 477     .impl.min_access_size = 4,
 478     .impl.max_access_size = 4,
 479 };
 480
 481 static int g364fb_post_load(void *opaque, int version_id)
 482 {
 483     G364State *s = opaque;
 484
 485     /* force refresh */
 486     g364fb_update_depth(s);
 487     g364fb_invalidate_display(s);
 488
 489     return 0;
 490 }
 491
 492 static const VMStateDescription vmstate_g364fb = {
 493     .name = "g364fb",
 494     .version_id = 1,
 495     .minimum_version_id = 1,
 496     .minimum_version_id_old = 1,
 497     .post_load = g364fb_post_load,
 498     .fields = (VMStateField[]) {
 499         VMSTATE_VBUFFER_UINT32(vram, G364State, 1, NULL, 0, vram_size),
 500         VMSTATE_BUFFER_UNSAFE(color_palette, G364State, 0, 256 * 3),
 501         VMSTATE_BUFFER_UNSAFE(cursor_palette, G364State, 0, 9),
 502         VMSTATE_UINT16_ARRAY(cursor, G364State, 512),
 503         VMSTATE_UINT32(cursor_position, G364State),
 504         VMSTATE_UINT32(ctla, G364State),
 505         VMSTATE_UINT32(top_of_screen, G364State),
 506         VMSTATE_UINT32(width, G364State),
 507         VMSTATE_UINT32(height, G364State),
 508         VMSTATE_END_OF_LIST()
 509     }
 510 };
 511
 512 static void g364fb_init(DeviceState *dev, G364State *s)
 513 {
 514     s->vram = g_malloc0(s->vram_size);
 515
 516     s->ds = graphic_console_init(g364fb_update_display,
 517                                  g364fb_invalidate_display,
 518                                  g364fb_screen_dump, NULL, s);
 519
 520     memory_region_init_io(&s->mem_ctrl, &g364fb_ctrl_ops, s, "ctrl", 0x180000);
 521     memory_region_init_ram_ptr(&s->mem_vram, dev, "vram",
 522                                s->vram_size, s->vram);
 523     memory_region_set_coalescing(&s->mem_vram);
 524 }
 525
 526 typedef struct {
 527     SysBusDevice busdev;
 528     G364State g364;
 529 } G364SysBusState;
 530
 531 static int g364fb_sysbus_init(SysBusDevice *dev)
 532 {
 533     G364State *s = &FROM_SYSBUS(G364SysBusState, dev)->g364;
 534
 535     g364fb_init(&dev->qdev, s);
 536     sysbus_init_irq(dev, &s->irq);
 537     sysbus_init_mmio_region(dev, &s->mem_ctrl);
 538     sysbus_init_mmio_region(dev, &s->mem_vram);
 539
 540     return 0;
 541 }
 542
 543 static void g364fb_sysbus_reset(DeviceState *d)
 544 {
 545     G364SysBusState *s = DO_UPCAST(G364SysBusState, busdev.qdev, d);
 546     g364fb_reset(&s->g364);
 547 }
 548
 549 static SysBusDeviceInfo g364fb_sysbus_info = {
 550     .init = g364fb_sysbus_init,
 551     .qdev.name = "sysbus-g364",
 552     .qdev.desc = "G364 framebuffer",
 553     .qdev.size = sizeof(G364SysBusState),
 554     .qdev.vmsd = &vmstate_g364fb,
 555     .qdev.reset = g364fb_sysbus_reset,
 556     .qdev.props = (Property[]) {
 557         DEFINE_PROP_HEX32("vram_size", G364SysBusState, g364.vram_size,
 558                           8 * 1024 * 1024),
 559         DEFINE_PROP_END_OF_LIST(),
 560     }
 561 };
 562
 563 static void g364fb_register(void)
 564 {
 565     sysbus_register_withprop(&g364fb_sysbus_info);
 566 }
 567
 568 device_init(g364fb_register);