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_update(s->ds, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 201                 xmin = s->width;
 202                 xmax = 0;
 203                 ymin = s->height;
 204                 ymax = 0;
 205             }
 206             x += G364_PAGE_SIZE;
 207             dy = x / s->width;
 208             x = x % s->width;
 209             y += dy;
 210             vram += G364_PAGE_SIZE;
 211             data_display += dy * ds_get_linesize(s->ds);
 212             dd = data_display + x * w;
 213         }
 214         page += G364_PAGE_SIZE;
 215     }
 216
 217 done:
 218     if (page_min != (ram_addr_t)-1) {
 219         dpy_update(s->ds, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 220         reset_dirty(s, page_min, page_max);
 221     }
 222 }
 223
 224 static void g364fb_draw_blank(G364State *s)
 225 {
 226     int i, w;
 227     uint8_t *d;
 228
 229     if (s->blanked) {
 230         /* Screen is already blank. No need to redraw it */
 231         return;
 232     }
 233
 234     w = s->width * ((ds_get_bits_per_pixel(s->ds) + 7) >> 3);
 235     d = ds_get_data(s->ds);
 236     for (i = 0; i < s->height; i++) {
 237         memset(d, 0, w);
 238         d += ds_get_linesize(s->ds);
 239     }
 240
 241     dpy_update(s->ds, 0, 0, s->width, s->height);
 242     s->blanked = 1;
 243 }
 244
 245 static void g364fb_update_display(void *opaque)
 246 {
 247     G364State *s = opaque;
 248
 249     qemu_flush_coalesced_mmio_buffer();
 250
 251     if (s->width == 0 || s->height == 0)
 252         return;
 253
 254     if (s->width != ds_get_width(s->ds) || s->height != ds_get_height(s->ds)) {
 255         qemu_console_resize(s->ds, s->width, s->height);
 256     }
 257
 258     if (s->ctla & CTLA_FORCE_BLANK) {
 259         g364fb_draw_blank(s);
 260     } else if (s->depth == 8) {
 261         g364fb_draw_graphic8(s);
 262     } else {
 263         error_report("g364: unknown guest depth %d", s->depth);
 264     }
 265
 266     qemu_irq_raise(s->irq);
 267 }
 268
 269 static inline void g364fb_invalidate_display(void *opaque)
 270 {
 271     G364State *s = opaque;
 272
 273     s->blanked = 0;
 274     memory_region_set_dirty(&s->mem_vram, 0, s->vram_size);
 275 }
 276
 277 static void g364fb_reset(G364State *s)
 278 {
 279     qemu_irq_lower(s->irq);
 280
 281     memset(s->color_palette, 0, sizeof(s->color_palette));
 282     memset(s->cursor_palette, 0, sizeof(s->cursor_palette));
 283     memset(s->cursor, 0, sizeof(s->cursor));
 284     s->cursor_position = 0;
 285     s->ctla = 0;
 286     s->top_of_screen = 0;
 287     s->width = s->height = 0;
 288     memset(s->vram, 0, s->vram_size);
 289     g364fb_invalidate_display(s);
 290 }
 291
 292 static void g364fb_screen_dump(void *opaque, const char *filename, bool cswitch,
 293                                Error **errp)
 294 {
 295     G364State *s = opaque;
 296     int ret, y, x;
 297     uint8_t index;
 298     uint8_t *data_buffer;
 299     FILE *f;
 300
 301     qemu_flush_coalesced_mmio_buffer();
 302
 303     if (s->depth != 8) {
 304         error_setg(errp, "g364: unknown guest depth %d", s->depth);
 305         return;
 306     }
 307
 308     f = fopen(filename, "wb");
 309     if (!f) {
 310         error_setg(errp, "failed to open file '%s': %s", filename,
 311                    strerror(errno));
 312         return;
 313     }
 314
 315     if (s->ctla & CTLA_FORCE_BLANK) {
 316         /* blank screen */
 317         ret = fprintf(f, "P4\n%d %d\n", s->width, s->height);
 318         if (ret < 0) {
 319             goto write_err;
 320         }
 321         for (y = 0; y < s->height; y++)
 322             for (x = 0; x < s->width; x++) {
 323                 ret = fputc(0, f);
 324                 if (ret == EOF) {
 325                     goto write_err;
 326                 }
 327             }
 328     } else {
 329         data_buffer = s->vram + s->top_of_screen;
 330         ret = fprintf(f, "P6\n%d %d\n%d\n", s->width, s->height, 255);
 331         if (ret < 0) {
 332             goto write_err;
 333         }
 334         for (y = 0; y < s->height; y++)
 335             for (x = 0; x < s->width; x++, data_buffer++) {
 336                 index = *data_buffer;
 337                 ret = fputc(s->color_palette[index][0], f);
 338                 if (ret == EOF) {
 339                     goto write_err;
 340                 }
 341                 ret = fputc(s->color_palette[index][1], f);
 342                 if (ret == EOF) {
 343                     goto write_err;
 344                 }
 345                 ret = fputc(s->color_palette[index][2], f);
 346                 if (ret == EOF) {
 347                     goto write_err;
 348                 }
 349         }
 350     }
 351
 352 out:
 353     fclose(f);
 354     return;
 355
 356 write_err:
 357     error_setg(errp, "failed to write to file '%s': %s", filename,
 358                strerror(errno));
 359     unlink(filename);
 360     goto out;
 361 }
 362
 363 /* called for accesses to io ports */
 364 static uint64_t g364fb_ctrl_read(void *opaque,
 365                                  hwaddr addr,
 366                                  unsigned int size)
 367 {
 368     G364State *s = opaque;
 369     uint32_t val;
 370
 371     if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 372         /* cursor pattern */
 373         int idx = (addr - REG_CURS_PAT) >> 3;
 374         val = s->cursor[idx];
 375     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 376         /* cursor palette */
 377         int idx = (addr - REG_CURS_PAL) >> 3;
 378         val = ((uint32_t)s->cursor_palette[idx][0] << 16);
 379         val |= ((uint32_t)s->cursor_palette[idx][1] << 8);
 380         val |= ((uint32_t)s->cursor_palette[idx][2] << 0);
 381     } else {
 382         switch (addr) {
 383             case REG_DISPLAY:
 384                 val = s->width / 4;
 385                 break;
 386             case REG_VDISPLAY:
 387                 val = s->height * 2;
 388                 break;
 389             case REG_CTLA:
 390                 val = s->ctla;
 391                 break;
 392             default:
 393             {
 394                 error_report("g364: invalid read at [" TARGET_FMT_plx "]",
 395                              addr);
 396                 val = 0;
 397                 break;
 398             }
 399         }
 400     }
 401
 402     trace_g364fb_read(addr, val);
 403
 404     return val;
 405 }
 406
 407 static void g364fb_update_depth(G364State *s)
 408 {
 409     static const int depths[8] = { 1, 2, 4, 8, 15, 16, 0 };
 410     s->depth = depths[(s->ctla & 0x00700000) >> 20];
 411 }
 412
 413 static void g364_invalidate_cursor_position(G364State *s)
 414 {
 415     int ymin, ymax, start, end;
 416
 417     /* invalidate only near the cursor */
 418     ymin = s->cursor_position & 0xfff;
 419     ymax = MIN(s->height, ymin + 64);
 420     start = ymin * ds_get_linesize(s->ds);
 421     end = (ymax + 1) * ds_get_linesize(s->ds);
 422
 423     memory_region_set_dirty(&s->mem_vram, start, end - start);
 424 }
 425
 426 static void g364fb_ctrl_write(void *opaque,
 427                               hwaddr addr,
 428                               uint64_t val,
 429                               unsigned int size)
 430 {
 431     G364State *s = opaque;
 432
 433     trace_g364fb_write(addr, val);
 434
 435     if (addr >= REG_CLR_PAL && addr < REG_CLR_PAL + 0x800) {
 436         /* color palette */
 437         int idx = (addr - REG_CLR_PAL) >> 3;
 438         s->color_palette[idx][0] = (val >> 16) & 0xff;
 439         s->color_palette[idx][1] = (val >> 8) & 0xff;
 440         s->color_palette[idx][2] = val & 0xff;
 441         g364fb_invalidate_display(s);
 442     } else if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 443         /* cursor pattern */
 444         int idx = (addr - REG_CURS_PAT) >> 3;
 445         s->cursor[idx] = val;
 446         g364fb_invalidate_display(s);
 447     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 448         /* cursor palette */
 449         int idx = (addr - REG_CURS_PAL) >> 3;
 450         s->cursor_palette[idx][0] = (val >> 16) & 0xff;
 451         s->cursor_palette[idx][1] = (val >> 8) & 0xff;
 452         s->cursor_palette[idx][2] = val & 0xff;
 453         g364fb_invalidate_display(s);
 454     } else {
 455         switch (addr) {
 456         case REG_BOOT: /* Boot timing */
 457         case 0x00108: /* Line timing: half sync */
 458         case 0x00110: /* Line timing: back porch */
 459         case 0x00120: /* Line timing: short display */
 460         case 0x00128: /* Frame timing: broad pulse */
 461         case 0x00130: /* Frame timing: v sync */
 462         case 0x00138: /* Frame timing: v preequalise */
 463         case 0x00140: /* Frame timing: v postequalise */
 464         case 0x00148: /* Frame timing: v blank */
 465         case 0x00158: /* Line timing: line time */
 466         case 0x00160: /* Frame store: line start */
 467         case 0x00168: /* vram cycle: mem init */
 468         case 0x00170: /* vram cycle: transfer delay */
 469         case 0x00200: /* vram cycle: mask register */
 470             /* ignore */
 471             break;
 472         case REG_TOP:
 473             s->top_of_screen = val;
 474             g364fb_invalidate_display(s);
 475             break;
 476         case REG_DISPLAY:
 477             s->width = val * 4;
 478             break;
 479         case REG_VDISPLAY:
 480             s->height = val / 2;
 481             break;
 482         case REG_CTLA:
 483             s->ctla = val;
 484             g364fb_update_depth(s);
 485             g364fb_invalidate_display(s);
 486             break;
 487         case REG_CURS_POS:
 488             g364_invalidate_cursor_position(s);
 489             s->cursor_position = val;
 490             g364_invalidate_cursor_position(s);
 491             break;
 492         case REG_RESET:
 493             g364fb_reset(s);
 494             break;
 495         default:
 496             error_report("g364: invalid write of 0x%" PRIx64
 497                          " at [" TARGET_FMT_plx "]", val, addr);
 498             break;
 499         }
 500     }
 501     qemu_irq_lower(s->irq);
 502 }
 503
 504 static const MemoryRegionOps g364fb_ctrl_ops = {
 505     .read = g364fb_ctrl_read,
 506     .write = g364fb_ctrl_write,
 507     .endianness = DEVICE_LITTLE_ENDIAN,
 508     .impl.min_access_size = 4,
 509     .impl.max_access_size = 4,
 510 };
 511
 512 static int g364fb_post_load(void *opaque, int version_id)
 513 {
 514     G364State *s = opaque;
 515
 516     /* force refresh */
 517     g364fb_update_depth(s);
 518     g364fb_invalidate_display(s);
 519
 520     return 0;
 521 }
 522
 523 static const VMStateDescription vmstate_g364fb = {
 524     .name = "g364fb",
 525     .version_id = 1,
 526     .minimum_version_id = 1,
 527     .minimum_version_id_old = 1,
 528     .post_load = g364fb_post_load,
 529     .fields = (VMStateField[]) {
 530         VMSTATE_VBUFFER_UINT32(vram, G364State, 1, NULL, 0, vram_size),
 531         VMSTATE_BUFFER_UNSAFE(color_palette, G364State, 0, 256 * 3),
 532         VMSTATE_BUFFER_UNSAFE(cursor_palette, G364State, 0, 9),
 533         VMSTATE_UINT16_ARRAY(cursor, G364State, 512),
 534         VMSTATE_UINT32(cursor_position, G364State),
 535         VMSTATE_UINT32(ctla, G364State),
 536         VMSTATE_UINT32(top_of_screen, G364State),
 537         VMSTATE_UINT32(width, G364State),
 538         VMSTATE_UINT32(height, G364State),
 539         VMSTATE_END_OF_LIST()
 540     }
 541 };
 542
 543 static void g364fb_init(DeviceState *dev, G364State *s)
 544 {
 545     s->vram = g_malloc0(s->vram_size);
 546
 547     s->ds = graphic_console_init(g364fb_update_display,
 548                                  g364fb_invalidate_display,
 549                                  g364fb_screen_dump, NULL, s);
 550
 551     memory_region_init_io(&s->mem_ctrl, &g364fb_ctrl_ops, s, "ctrl", 0x180000);
 552     memory_region_init_ram_ptr(&s->mem_vram, "vram",
 553                                s->vram_size, s->vram);
 554     vmstate_register_ram(&s->mem_vram, dev);
 555     memory_region_set_coalescing(&s->mem_vram);
 556 }
 557
 558 typedef struct {
 559     SysBusDevice busdev;
 560     G364State g364;
 561 } G364SysBusState;
 562
 563 static int g364fb_sysbus_init(SysBusDevice *dev)
 564 {
 565     G364State *s = &FROM_SYSBUS(G364SysBusState, dev)->g364;
 566
 567     g364fb_init(&dev->qdev, s);
 568     sysbus_init_irq(dev, &s->irq);
 569     sysbus_init_mmio(dev, &s->mem_ctrl);
 570     sysbus_init_mmio(dev, &s->mem_vram);
 571
 572     return 0;
 573 }
 574
 575 static void g364fb_sysbus_reset(DeviceState *d)
 576 {
 577     G364SysBusState *s = DO_UPCAST(G364SysBusState, busdev.qdev, d);
 578     g364fb_reset(&s->g364);
 579 }
 580
 581 static Property g364fb_sysbus_properties[] = {
 582     DEFINE_PROP_HEX32("vram_size", G364SysBusState, g364.vram_size,
 583     8 * 1024 * 1024),
 584     DEFINE_PROP_END_OF_LIST(),
 585 };
 586
 587 static void g364fb_sysbus_class_init(ObjectClass *klass, void *data)
 588 {
 589     DeviceClass *dc = DEVICE_CLASS(klass);
 590     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 591
 592     k->init = g364fb_sysbus_init;
 593     dc->desc = "G364 framebuffer";
 594     dc->reset = g364fb_sysbus_reset;
 595     dc->vmsd = &vmstate_g364fb;
 596     dc->props = g364fb_sysbus_properties;
 597 }
 598
 599 static TypeInfo g364fb_sysbus_info = {
 600     .name          = "sysbus-g364",
 601     .parent        = TYPE_SYS_BUS_DEVICE,
 602     .instance_size = sizeof(G364SysBusState),
 603     .class_init    = g364fb_sysbus_class_init,
 604 };
 605
 606 static void g364fb_register_types(void)
 607 {
 608     type_register_static(&g364fb_sysbus_info);
 609 }
 610
 611 type_init(g364fb_register_types)