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/hw.h"
  21 #include "ui/console.h"
  22 #include "ui/pixel_ops.h"
  23 #include "trace.h"
  24 #include "hw/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     QemuConsole *con;
  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     DisplaySurface *surface = qemu_console_surface(s->con);
  81     int i, w;
  82     uint8_t *vram;
  83     uint8_t *data_display, *dd;
  84     ram_addr_t page, page_min, page_max;
  85     int x, y;
  86     int xmin, xmax;
  87     int ymin, ymax;
  88     int xcursor, ycursor;
  89     unsigned int (*rgb_to_pixel)(unsigned int r, unsigned int g, unsigned int b);
  90
  91     switch (surface_bits_per_pixel(surface)) {
  92         case 8:
  93             rgb_to_pixel = rgb_to_pixel8;
  94             w = 1;
  95             break;
  96         case 15:
  97             rgb_to_pixel = rgb_to_pixel15;
  98             w = 2;
  99             break;
 100         case 16:
 101             rgb_to_pixel = rgb_to_pixel16;
 102             w = 2;
 103             break;
 104         case 32:
 105             rgb_to_pixel = rgb_to_pixel32;
 106             w = 4;
 107             break;
 108         default:
 109             hw_error("g364: unknown host depth %d",
 110                      surface_bits_per_pixel(surface));
 111             return;
 112     }
 113
 114     page = 0;
 115     page_min = (ram_addr_t)-1;
 116     page_max = 0;
 117
 118     x = y = 0;
 119     xmin = s->width;
 120     xmax = 0;
 121     ymin = s->height;
 122     ymax = 0;
 123
 124     if (!(s->ctla & CTLA_NO_CURSOR)) {
 125         xcursor = s->cursor_position >> 12;
 126         ycursor = s->cursor_position & 0xfff;
 127     } else {
 128         xcursor = ycursor = -65;
 129     }
 130
 131     vram = s->vram + s->top_of_screen;
 132     /* XXX: out of range in vram? */
 133     data_display = dd = surface_data(surface);
 134     while (y < s->height) {
 135         if (check_dirty(s, page)) {
 136             if (y < ymin)
 137                 ymin = ymax = y;
 138             if (page_min == (ram_addr_t)-1)
 139                 page_min = page;
 140             page_max = page;
 141             if (x < xmin)
 142                 xmin = x;
 143             for (i = 0; i < G364_PAGE_SIZE; i++) {
 144                 uint8_t index;
 145                 unsigned int color;
 146                 if (unlikely((y >= ycursor && y < ycursor + 64) &&
 147                     (x >= xcursor && x < xcursor + 64))) {
 148                     /* pointer area */
 149                     int xdiff = x - xcursor;
 150                     uint16_t curs = s->cursor[(y - ycursor) * 8 + xdiff / 8];
 151                     int op = (curs >> ((xdiff & 7) * 2)) & 3;
 152                     if (likely(op == 0)) {
 153                         /* transparent */
 154                         index = *vram;
 155                         color = (*rgb_to_pixel)(
 156                             s->color_palette[index][0],
 157                             s->color_palette[index][1],
 158                             s->color_palette[index][2]);
 159                     } else {
 160                         /* get cursor color */
 161                         index = op - 1;
 162                         color = (*rgb_to_pixel)(
 163                             s->cursor_palette[index][0],
 164                             s->cursor_palette[index][1],
 165                             s->cursor_palette[index][2]);
 166                     }
 167                 } else {
 168                     /* normal area */
 169                     index = *vram;
 170                     color = (*rgb_to_pixel)(
 171                         s->color_palette[index][0],
 172                         s->color_palette[index][1],
 173                         s->color_palette[index][2]);
 174                 }
 175                 memcpy(dd, &color, w);
 176                 dd += w;
 177                 x++;
 178                 vram++;
 179                 if (x == s->width) {
 180                     xmax = s->width - 1;
 181                     y++;
 182                     if (y == s->height) {
 183                         ymax = s->height - 1;
 184                         goto done;
 185                     }
 186                     data_display = dd = data_display + surface_stride(surface);
 187                     xmin = 0;
 188                     x = 0;
 189                 }
 190             }
 191             if (x > xmax)
 192                 xmax = x;
 193             if (y > ymax)
 194                 ymax = y;
 195         } else {
 196             int dy;
 197             if (page_min != (ram_addr_t)-1) {
 198                 reset_dirty(s, page_min, page_max);
 199                 page_min = (ram_addr_t)-1;
 200                 page_max = 0;
 201                 dpy_gfx_update(s->con, xmin, ymin,
 202                                xmax - xmin + 1, ymax - ymin + 1);
 203                 xmin = s->width;
 204                 xmax = 0;
 205                 ymin = s->height;
 206                 ymax = 0;
 207             }
 208             x += G364_PAGE_SIZE;
 209             dy = x / s->width;
 210             x = x % s->width;
 211             y += dy;
 212             vram += G364_PAGE_SIZE;
 213             data_display += dy * surface_stride(surface);
 214             dd = data_display + x * w;
 215         }
 216         page += G364_PAGE_SIZE;
 217     }
 218
 219 done:
 220     if (page_min != (ram_addr_t)-1) {
 221         dpy_gfx_update(s->con, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 222         reset_dirty(s, page_min, page_max);
 223     }
 224 }
 225
 226 static void g364fb_draw_blank(G364State *s)
 227 {
 228     DisplaySurface *surface = qemu_console_surface(s->con);
 229     int i, w;
 230     uint8_t *d;
 231
 232     if (s->blanked) {
 233         /* Screen is already blank. No need to redraw it */
 234         return;
 235     }
 236
 237     w = s->width * surface_bytes_per_pixel(surface);
 238     d = surface_data(surface);
 239     for (i = 0; i < s->height; i++) {
 240         memset(d, 0, w);
 241         d += surface_stride(surface);
 242     }
 243
 244     dpy_gfx_update(s->con, 0, 0, s->width, s->height);
 245     s->blanked = 1;
 246 }
 247
 248 static void g364fb_update_display(void *opaque)
 249 {
 250     G364State *s = opaque;
 251     DisplaySurface *surface = qemu_console_surface(s->con);
 252
 253     qemu_flush_coalesced_mmio_buffer();
 254
 255     if (s->width == 0 || s->height == 0)
 256         return;
 257
 258     if (s->width != surface_width(surface) ||
 259         s->height != surface_height(surface)) {
 260         qemu_console_resize(s->con, s->width, s->height);
 261     }
 262
 263     if (s->ctla & CTLA_FORCE_BLANK) {
 264         g364fb_draw_blank(s);
 265     } else if (s->depth == 8) {
 266         g364fb_draw_graphic8(s);
 267     } else {
 268         error_report("g364: unknown guest depth %d", s->depth);
 269     }
 270
 271     qemu_irq_raise(s->irq);
 272 }
 273
 274 static inline void g364fb_invalidate_display(void *opaque)
 275 {
 276     G364State *s = opaque;
 277
 278     s->blanked = 0;
 279     memory_region_set_dirty(&s->mem_vram, 0, s->vram_size);
 280 }
 281
 282 static void g364fb_reset(G364State *s)
 283 {
 284     qemu_irq_lower(s->irq);
 285
 286     memset(s->color_palette, 0, sizeof(s->color_palette));
 287     memset(s->cursor_palette, 0, sizeof(s->cursor_palette));
 288     memset(s->cursor, 0, sizeof(s->cursor));
 289     s->cursor_position = 0;
 290     s->ctla = 0;
 291     s->top_of_screen = 0;
 292     s->width = s->height = 0;
 293     memset(s->vram, 0, s->vram_size);
 294     g364fb_invalidate_display(s);
 295 }
 296
 297 static void g364fb_screen_dump(void *opaque, const char *filename, bool cswitch,
 298                                Error **errp)
 299 {
 300     G364State *s = opaque;
 301     int ret, y, x;
 302     uint8_t index;
 303     uint8_t *data_buffer;
 304     FILE *f;
 305
 306     qemu_flush_coalesced_mmio_buffer();
 307
 308     if (s->depth != 8) {
 309         error_setg(errp, "g364: unknown guest depth %d", s->depth);
 310         return;
 311     }
 312
 313     f = fopen(filename, "wb");
 314     if (!f) {
 315         error_setg(errp, "failed to open file '%s': %s", filename,
 316                    strerror(errno));
 317         return;
 318     }
 319
 320     if (s->ctla & CTLA_FORCE_BLANK) {
 321         /* blank screen */
 322         ret = fprintf(f, "P4\n%d %d\n", s->width, s->height);
 323         if (ret < 0) {
 324             goto write_err;
 325         }
 326         for (y = 0; y < s->height; y++)
 327             for (x = 0; x < s->width; x++) {
 328                 ret = fputc(0, f);
 329                 if (ret == EOF) {
 330                     goto write_err;
 331                 }
 332             }
 333     } else {
 334         data_buffer = s->vram + s->top_of_screen;
 335         ret = fprintf(f, "P6\n%d %d\n%d\n", s->width, s->height, 255);
 336         if (ret < 0) {
 337             goto write_err;
 338         }
 339         for (y = 0; y < s->height; y++)
 340             for (x = 0; x < s->width; x++, data_buffer++) {
 341                 index = *data_buffer;
 342                 ret = fputc(s->color_palette[index][0], f);
 343                 if (ret == EOF) {
 344                     goto write_err;
 345                 }
 346                 ret = fputc(s->color_palette[index][1], f);
 347                 if (ret == EOF) {
 348                     goto write_err;
 349                 }
 350                 ret = fputc(s->color_palette[index][2], f);
 351                 if (ret == EOF) {
 352                     goto write_err;
 353                 }
 354         }
 355     }
 356
 357 out:
 358     fclose(f);
 359     return;
 360
 361 write_err:
 362     error_setg(errp, "failed to write to file '%s': %s", filename,
 363                strerror(errno));
 364     unlink(filename);
 365     goto out;
 366 }
 367
 368 /* called for accesses to io ports */
 369 static uint64_t g364fb_ctrl_read(void *opaque,
 370                                  hwaddr addr,
 371                                  unsigned int size)
 372 {
 373     G364State *s = opaque;
 374     uint32_t val;
 375
 376     if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 377         /* cursor pattern */
 378         int idx = (addr - REG_CURS_PAT) >> 3;
 379         val = s->cursor[idx];
 380     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 381         /* cursor palette */
 382         int idx = (addr - REG_CURS_PAL) >> 3;
 383         val = ((uint32_t)s->cursor_palette[idx][0] << 16);
 384         val |= ((uint32_t)s->cursor_palette[idx][1] << 8);
 385         val |= ((uint32_t)s->cursor_palette[idx][2] << 0);
 386     } else {
 387         switch (addr) {
 388             case REG_DISPLAY:
 389                 val = s->width / 4;
 390                 break;
 391             case REG_VDISPLAY:
 392                 val = s->height * 2;
 393                 break;
 394             case REG_CTLA:
 395                 val = s->ctla;
 396                 break;
 397             default:
 398             {
 399                 error_report("g364: invalid read at [" TARGET_FMT_plx "]",
 400                              addr);
 401                 val = 0;
 402                 break;
 403             }
 404         }
 405     }
 406
 407     trace_g364fb_read(addr, val);
 408
 409     return val;
 410 }
 411
 412 static void g364fb_update_depth(G364State *s)
 413 {
 414     static const int depths[8] = { 1, 2, 4, 8, 15, 16, 0 };
 415     s->depth = depths[(s->ctla & 0x00700000) >> 20];
 416 }
 417
 418 static void g364_invalidate_cursor_position(G364State *s)
 419 {
 420     DisplaySurface *surface = qemu_console_surface(s->con);
 421     int ymin, ymax, start, end;
 422
 423     /* invalidate only near the cursor */
 424     ymin = s->cursor_position & 0xfff;
 425     ymax = MIN(s->height, ymin + 64);
 426     start = ymin * surface_stride(surface);
 427     end = (ymax + 1) * surface_stride(surface);
 428
 429     memory_region_set_dirty(&s->mem_vram, start, end - start);
 430 }
 431
 432 static void g364fb_ctrl_write(void *opaque,
 433                               hwaddr addr,
 434                               uint64_t val,
 435                               unsigned int size)
 436 {
 437     G364State *s = opaque;
 438
 439     trace_g364fb_write(addr, val);
 440
 441     if (addr >= REG_CLR_PAL && addr < REG_CLR_PAL + 0x800) {
 442         /* color palette */
 443         int idx = (addr - REG_CLR_PAL) >> 3;
 444         s->color_palette[idx][0] = (val >> 16) & 0xff;
 445         s->color_palette[idx][1] = (val >> 8) & 0xff;
 446         s->color_palette[idx][2] = val & 0xff;
 447         g364fb_invalidate_display(s);
 448     } else if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 449         /* cursor pattern */
 450         int idx = (addr - REG_CURS_PAT) >> 3;
 451         s->cursor[idx] = val;
 452         g364fb_invalidate_display(s);
 453     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 454         /* cursor palette */
 455         int idx = (addr - REG_CURS_PAL) >> 3;
 456         s->cursor_palette[idx][0] = (val >> 16) & 0xff;
 457         s->cursor_palette[idx][1] = (val >> 8) & 0xff;
 458         s->cursor_palette[idx][2] = val & 0xff;
 459         g364fb_invalidate_display(s);
 460     } else {
 461         switch (addr) {
 462         case REG_BOOT: /* Boot timing */
 463         case 0x00108: /* Line timing: half sync */
 464         case 0x00110: /* Line timing: back porch */
 465         case 0x00120: /* Line timing: short display */
 466         case 0x00128: /* Frame timing: broad pulse */
 467         case 0x00130: /* Frame timing: v sync */
 468         case 0x00138: /* Frame timing: v preequalise */
 469         case 0x00140: /* Frame timing: v postequalise */
 470         case 0x00148: /* Frame timing: v blank */
 471         case 0x00158: /* Line timing: line time */
 472         case 0x00160: /* Frame store: line start */
 473         case 0x00168: /* vram cycle: mem init */
 474         case 0x00170: /* vram cycle: transfer delay */
 475         case 0x00200: /* vram cycle: mask register */
 476             /* ignore */
 477             break;
 478         case REG_TOP:
 479             s->top_of_screen = val;
 480             g364fb_invalidate_display(s);
 481             break;
 482         case REG_DISPLAY:
 483             s->width = val * 4;
 484             break;
 485         case REG_VDISPLAY:
 486             s->height = val / 2;
 487             break;
 488         case REG_CTLA:
 489             s->ctla = val;
 490             g364fb_update_depth(s);
 491             g364fb_invalidate_display(s);
 492             break;
 493         case REG_CURS_POS:
 494             g364_invalidate_cursor_position(s);
 495             s->cursor_position = val;
 496             g364_invalidate_cursor_position(s);
 497             break;
 498         case REG_RESET:
 499             g364fb_reset(s);
 500             break;
 501         default:
 502             error_report("g364: invalid write of 0x%" PRIx64
 503                          " at [" TARGET_FMT_plx "]", val, addr);
 504             break;
 505         }
 506     }
 507     qemu_irq_lower(s->irq);
 508 }
 509
 510 static const MemoryRegionOps g364fb_ctrl_ops = {
 511     .read = g364fb_ctrl_read,
 512     .write = g364fb_ctrl_write,
 513     .endianness = DEVICE_LITTLE_ENDIAN,
 514     .impl.min_access_size = 4,
 515     .impl.max_access_size = 4,
 516 };
 517
 518 static int g364fb_post_load(void *opaque, int version_id)
 519 {
 520     G364State *s = opaque;
 521
 522     /* force refresh */
 523     g364fb_update_depth(s);
 524     g364fb_invalidate_display(s);
 525
 526     return 0;
 527 }
 528
 529 static const VMStateDescription vmstate_g364fb = {
 530     .name = "g364fb",
 531     .version_id = 1,
 532     .minimum_version_id = 1,
 533     .minimum_version_id_old = 1,
 534     .post_load = g364fb_post_load,
 535     .fields = (VMStateField[]) {
 536         VMSTATE_VBUFFER_UINT32(vram, G364State, 1, NULL, 0, vram_size),
 537         VMSTATE_BUFFER_UNSAFE(color_palette, G364State, 0, 256 * 3),
 538         VMSTATE_BUFFER_UNSAFE(cursor_palette, G364State, 0, 9),
 539         VMSTATE_UINT16_ARRAY(cursor, G364State, 512),
 540         VMSTATE_UINT32(cursor_position, G364State),
 541         VMSTATE_UINT32(ctla, G364State),
 542         VMSTATE_UINT32(top_of_screen, G364State),
 543         VMSTATE_UINT32(width, G364State),
 544         VMSTATE_UINT32(height, G364State),
 545         VMSTATE_END_OF_LIST()
 546     }
 547 };
 548
 549 static void g364fb_init(DeviceState *dev, G364State *s)
 550 {
 551     s->vram = g_malloc0(s->vram_size);
 552
 553     s->con = graphic_console_init(g364fb_update_display,
 554                                   g364fb_invalidate_display,
 555                                   g364fb_screen_dump, NULL, s);
 556
 557     memory_region_init_io(&s->mem_ctrl, &g364fb_ctrl_ops, s, "ctrl", 0x180000);
 558     memory_region_init_ram_ptr(&s->mem_vram, "vram",
 559                                s->vram_size, s->vram);
 560     vmstate_register_ram(&s->mem_vram, dev);
 561     memory_region_set_coalescing(&s->mem_vram);
 562 }
 563
 564 typedef struct {
 565     SysBusDevice busdev;
 566     G364State g364;
 567 } G364SysBusState;
 568
 569 static int g364fb_sysbus_init(SysBusDevice *dev)
 570 {
 571     G364State *s = &FROM_SYSBUS(G364SysBusState, dev)->g364;
 572
 573     g364fb_init(&dev->qdev, s);
 574     sysbus_init_irq(dev, &s->irq);
 575     sysbus_init_mmio(dev, &s->mem_ctrl);
 576     sysbus_init_mmio(dev, &s->mem_vram);
 577
 578     return 0;
 579 }
 580
 581 static void g364fb_sysbus_reset(DeviceState *d)
 582 {
 583     G364SysBusState *s = DO_UPCAST(G364SysBusState, busdev.qdev, d);
 584     g364fb_reset(&s->g364);
 585 }
 586
 587 static Property g364fb_sysbus_properties[] = {
 588     DEFINE_PROP_HEX32("vram_size", G364SysBusState, g364.vram_size,
 589     8 * 1024 * 1024),
 590     DEFINE_PROP_END_OF_LIST(),
 591 };
 592
 593 static void g364fb_sysbus_class_init(ObjectClass *klass, void *data)
 594 {
 595     DeviceClass *dc = DEVICE_CLASS(klass);
 596     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 597
 598     k->init = g364fb_sysbus_init;
 599     dc->desc = "G364 framebuffer";
 600     dc->reset = g364fb_sysbus_reset;
 601     dc->vmsd = &vmstate_g364fb;
 602     dc->props = g364fb_sysbus_properties;
 603 }
 604
 605 static const TypeInfo g364fb_sysbus_info = {
 606     .name          = "sysbus-g364",
 607     .parent        = TYPE_SYS_BUS_DEVICE,
 608     .instance_size = sizeof(G364SysBusState),
 609     .class_init    = g364fb_sysbus_class_init,
 610 };
 611
 612 static void g364fb_register_types(void)
 613 {
 614     type_register_static(&g364fb_sysbus_info);
 615 }
 616
 617 type_init(g364fb_register_types)