hw/display/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 "qemu/osdep.h"
  21 #include "qemu/units.h"
  22 #include "hw/hw.h"
  23 #include "qemu/error-report.h"
  24 #include "ui/console.h"
  25 #include "ui/pixel_ops.h"
  26 #include "trace.h"
  27 #include "hw/sysbus.h"
  28
  29 typedef struct G364State {
  30     /* hardware */
  31     uint8_t *vram;
  32     uint32_t vram_size;
  33     qemu_irq irq;
  34     MemoryRegion mem_vram;
  35     MemoryRegion mem_ctrl;
  36     /* registers */
  37     uint8_t color_palette[256][3];
  38     uint8_t cursor_palette[3][3];
  39     uint16_t cursor[512];
  40     uint32_t cursor_position;
  41     uint32_t ctla;
  42     uint32_t top_of_screen;
  43     uint32_t width, height; /* in pixels */
  44     /* display refresh support */
  45     QemuConsole *con;
  46     int depth;
  47     int blanked;
  48 } G364State;
  49
  50 #define REG_BOOT     0x000000
  51 #define REG_DISPLAY  0x000118
  52 #define REG_VDISPLAY 0x000150
  53 #define REG_CTLA     0x000300
  54 #define REG_TOP      0x000400
  55 #define REG_CURS_PAL 0x000508
  56 #define REG_CURS_POS 0x000638
  57 #define REG_CLR_PAL  0x000800
  58 #define REG_CURS_PAT 0x001000
  59 #define REG_RESET    0x100000
  60
  61 #define CTLA_FORCE_BLANK 0x00000400
  62 #define CTLA_NO_CURSOR   0x00800000
  63
  64 #define G364_PAGE_SIZE 4096
  65
  66 static inline int check_dirty(G364State *s, DirtyBitmapSnapshot *snap, ram_addr_t page)
  67 {
  68     return memory_region_snapshot_get_dirty(&s->mem_vram, snap, page, G364_PAGE_SIZE);
  69 }
  70
  71 static void g364fb_draw_graphic8(G364State *s)
  72 {
  73     DisplaySurface *surface = qemu_console_surface(s->con);
  74     DirtyBitmapSnapshot *snap;
  75     int i, w;
  76     uint8_t *vram;
  77     uint8_t *data_display, *dd;
  78     ram_addr_t page;
  79     int x, y;
  80     int xmin, xmax;
  81     int ymin, ymax;
  82     int xcursor, ycursor;
  83     unsigned int (*rgb_to_pixel)(unsigned int r, unsigned int g, unsigned int b);
  84
  85     switch (surface_bits_per_pixel(surface)) {
  86         case 8:
  87             rgb_to_pixel = rgb_to_pixel8;
  88             w = 1;
  89             break;
  90         case 15:
  91             rgb_to_pixel = rgb_to_pixel15;
  92             w = 2;
  93             break;
  94         case 16:
  95             rgb_to_pixel = rgb_to_pixel16;
  96             w = 2;
  97             break;
  98         case 32:
  99             rgb_to_pixel = rgb_to_pixel32;
 100             w = 4;
 101             break;
 102         default:
 103             hw_error("g364: unknown host depth %d",
 104                      surface_bits_per_pixel(surface));
 105             return;
 106     }
 107
 108     page = 0;
 109
 110     x = y = 0;
 111     xmin = s->width;
 112     xmax = 0;
 113     ymin = s->height;
 114     ymax = 0;
 115
 116     if (!(s->ctla & CTLA_NO_CURSOR)) {
 117         xcursor = s->cursor_position >> 12;
 118         ycursor = s->cursor_position & 0xfff;
 119     } else {
 120         xcursor = ycursor = -65;
 121     }
 122
 123     vram = s->vram + s->top_of_screen;
 124     /* XXX: out of range in vram? */
 125     data_display = dd = surface_data(surface);
 126     snap = memory_region_snapshot_and_clear_dirty(&s->mem_vram, 0, s->vram_size,
 127                                                   DIRTY_MEMORY_VGA);
 128     while (y < s->height) {
 129         if (check_dirty(s, snap, page)) {
 130             if (y < ymin)
 131                 ymin = ymax = y;
 132             if (x < xmin)
 133                 xmin = x;
 134             for (i = 0; i < G364_PAGE_SIZE; i++) {
 135                 uint8_t index;
 136                 unsigned int color;
 137                 if (unlikely((y >= ycursor && y < ycursor + 64) &&
 138                     (x >= xcursor && x < xcursor + 64))) {
 139                     /* pointer area */
 140                     int xdiff = x - xcursor;
 141                     uint16_t curs = s->cursor[(y - ycursor) * 8 + xdiff / 8];
 142                     int op = (curs >> ((xdiff & 7) * 2)) & 3;
 143                     if (likely(op == 0)) {
 144                         /* transparent */
 145                         index = *vram;
 146                         color = (*rgb_to_pixel)(
 147                             s->color_palette[index][0],
 148                             s->color_palette[index][1],
 149                             s->color_palette[index][2]);
 150                     } else {
 151                         /* get cursor color */
 152                         index = op - 1;
 153                         color = (*rgb_to_pixel)(
 154                             s->cursor_palette[index][0],
 155                             s->cursor_palette[index][1],
 156                             s->cursor_palette[index][2]);
 157                     }
 158                 } else {
 159                     /* normal area */
 160                     index = *vram;
 161                     color = (*rgb_to_pixel)(
 162                         s->color_palette[index][0],
 163                         s->color_palette[index][1],
 164                         s->color_palette[index][2]);
 165                 }
 166                 memcpy(dd, &color, w);
 167                 dd += w;
 168                 x++;
 169                 vram++;
 170                 if (x == s->width) {
 171                     xmax = s->width - 1;
 172                     y++;
 173                     if (y == s->height) {
 174                         ymax = s->height - 1;
 175                         goto done;
 176                     }
 177                     data_display = dd = data_display + surface_stride(surface);
 178                     xmin = 0;
 179                     x = 0;
 180                 }
 181             }
 182             if (x > xmax)
 183                 xmax = x;
 184             if (y > ymax)
 185                 ymax = y;
 186         } else {
 187             int dy;
 188             if (xmax || ymax) {
 189                 dpy_gfx_update(s->con, xmin, ymin,
 190                                xmax - xmin + 1, ymax - ymin + 1);
 191                 xmin = s->width;
 192                 xmax = 0;
 193                 ymin = s->height;
 194                 ymax = 0;
 195             }
 196             x += G364_PAGE_SIZE;
 197             dy = x / s->width;
 198             x = x % s->width;
 199             y += dy;
 200             vram += G364_PAGE_SIZE;
 201             data_display += dy * surface_stride(surface);
 202             dd = data_display + x * w;
 203         }
 204         page += G364_PAGE_SIZE;
 205     }
 206
 207 done:
 208     if (xmax || ymax) {
 209         dpy_gfx_update(s->con, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 210     }
 211     g_free(snap);
 212 }
 213
 214 static void g364fb_draw_blank(G364State *s)
 215 {
 216     DisplaySurface *surface = qemu_console_surface(s->con);
 217     int i, w;
 218     uint8_t *d;
 219
 220     if (s->blanked) {
 221         /* Screen is already blank. No need to redraw it */
 222         return;
 223     }
 224
 225     w = s->width * surface_bytes_per_pixel(surface);
 226     d = surface_data(surface);
 227     for (i = 0; i < s->height; i++) {
 228         memset(d, 0, w);
 229         d += surface_stride(surface);
 230     }
 231
 232     dpy_gfx_update_full(s->con);
 233     s->blanked = 1;
 234 }
 235
 236 static void g364fb_update_display(void *opaque)
 237 {
 238     G364State *s = opaque;
 239     DisplaySurface *surface = qemu_console_surface(s->con);
 240
 241     qemu_flush_coalesced_mmio_buffer();
 242
 243     if (s->width == 0 || s->height == 0)
 244         return;
 245
 246     if (s->width != surface_width(surface) ||
 247         s->height != surface_height(surface)) {
 248         qemu_console_resize(s->con, s->width, s->height);
 249     }
 250
 251     if (s->ctla & CTLA_FORCE_BLANK) {
 252         g364fb_draw_blank(s);
 253     } else if (s->depth == 8) {
 254         g364fb_draw_graphic8(s);
 255     } else {
 256         error_report("g364: unknown guest depth %d", s->depth);
 257     }
 258
 259     qemu_irq_raise(s->irq);
 260 }
 261
 262 static inline void g364fb_invalidate_display(void *opaque)
 263 {
 264     G364State *s = opaque;
 265
 266     s->blanked = 0;
 267     memory_region_set_dirty(&s->mem_vram, 0, s->vram_size);
 268 }
 269
 270 static void g364fb_reset(G364State *s)
 271 {
 272     qemu_irq_lower(s->irq);
 273
 274     memset(s->color_palette, 0, sizeof(s->color_palette));
 275     memset(s->cursor_palette, 0, sizeof(s->cursor_palette));
 276     memset(s->cursor, 0, sizeof(s->cursor));
 277     s->cursor_position = 0;
 278     s->ctla = 0;
 279     s->top_of_screen = 0;
 280     s->width = s->height = 0;
 281     memset(s->vram, 0, s->vram_size);
 282     g364fb_invalidate_display(s);
 283 }
 284
 285 /* called for accesses to io ports */
 286 static uint64_t g364fb_ctrl_read(void *opaque,
 287                                  hwaddr addr,
 288                                  unsigned int size)
 289 {
 290     G364State *s = opaque;
 291     uint32_t val;
 292
 293     if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 294         /* cursor pattern */
 295         int idx = (addr - REG_CURS_PAT) >> 3;
 296         val = s->cursor[idx];
 297     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 298         /* cursor palette */
 299         int idx = (addr - REG_CURS_PAL) >> 3;
 300         val = ((uint32_t)s->cursor_palette[idx][0] << 16);
 301         val |= ((uint32_t)s->cursor_palette[idx][1] << 8);
 302         val |= ((uint32_t)s->cursor_palette[idx][2] << 0);
 303     } else {
 304         switch (addr) {
 305             case REG_DISPLAY:
 306                 val = s->width / 4;
 307                 break;
 308             case REG_VDISPLAY:
 309                 val = s->height * 2;
 310                 break;
 311             case REG_CTLA:
 312                 val = s->ctla;
 313                 break;
 314             default:
 315             {
 316                 error_report("g364: invalid read at [" TARGET_FMT_plx "]",
 317                              addr);
 318                 val = 0;
 319                 break;
 320             }
 321         }
 322     }
 323
 324     trace_g364fb_read(addr, val);
 325
 326     return val;
 327 }
 328
 329 static void g364fb_update_depth(G364State *s)
 330 {
 331     static const int depths[8] = { 1, 2, 4, 8, 15, 16, 0 };
 332     s->depth = depths[(s->ctla & 0x00700000) >> 20];
 333 }
 334
 335 static void g364_invalidate_cursor_position(G364State *s)
 336 {
 337     DisplaySurface *surface = qemu_console_surface(s->con);
 338     int ymin, ymax, start, end;
 339
 340     /* invalidate only near the cursor */
 341     ymin = s->cursor_position & 0xfff;
 342     ymax = MIN(s->height, ymin + 64);
 343     start = ymin * surface_stride(surface);
 344     end = (ymax + 1) * surface_stride(surface);
 345
 346     memory_region_set_dirty(&s->mem_vram, start, end - start);
 347 }
 348
 349 static void g364fb_ctrl_write(void *opaque,
 350                               hwaddr addr,
 351                               uint64_t val,
 352                               unsigned int size)
 353 {
 354     G364State *s = opaque;
 355
 356     trace_g364fb_write(addr, val);
 357
 358     if (addr >= REG_CLR_PAL && addr < REG_CLR_PAL + 0x800) {
 359         /* color palette */
 360         int idx = (addr - REG_CLR_PAL) >> 3;
 361         s->color_palette[idx][0] = (val >> 16) & 0xff;
 362         s->color_palette[idx][1] = (val >> 8) & 0xff;
 363         s->color_palette[idx][2] = val & 0xff;
 364         g364fb_invalidate_display(s);
 365     } else if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 366         /* cursor pattern */
 367         int idx = (addr - REG_CURS_PAT) >> 3;
 368         s->cursor[idx] = val;
 369         g364fb_invalidate_display(s);
 370     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 371         /* cursor palette */
 372         int idx = (addr - REG_CURS_PAL) >> 3;
 373         s->cursor_palette[idx][0] = (val >> 16) & 0xff;
 374         s->cursor_palette[idx][1] = (val >> 8) & 0xff;
 375         s->cursor_palette[idx][2] = val & 0xff;
 376         g364fb_invalidate_display(s);
 377     } else {
 378         switch (addr) {
 379         case REG_BOOT: /* Boot timing */
 380         case 0x00108: /* Line timing: half sync */
 381         case 0x00110: /* Line timing: back porch */
 382         case 0x00120: /* Line timing: short display */
 383         case 0x00128: /* Frame timing: broad pulse */
 384         case 0x00130: /* Frame timing: v sync */
 385         case 0x00138: /* Frame timing: v preequalise */
 386         case 0x00140: /* Frame timing: v postequalise */
 387         case 0x00148: /* Frame timing: v blank */
 388         case 0x00158: /* Line timing: line time */
 389         case 0x00160: /* Frame store: line start */
 390         case 0x00168: /* vram cycle: mem init */
 391         case 0x00170: /* vram cycle: transfer delay */
 392         case 0x00200: /* vram cycle: mask register */
 393             /* ignore */
 394             break;
 395         case REG_TOP:
 396             s->top_of_screen = val;
 397             g364fb_invalidate_display(s);
 398             break;
 399         case REG_DISPLAY:
 400             s->width = val * 4;
 401             break;
 402         case REG_VDISPLAY:
 403             s->height = val / 2;
 404             break;
 405         case REG_CTLA:
 406             s->ctla = val;
 407             g364fb_update_depth(s);
 408             g364fb_invalidate_display(s);
 409             break;
 410         case REG_CURS_POS:
 411             g364_invalidate_cursor_position(s);
 412             s->cursor_position = val;
 413             g364_invalidate_cursor_position(s);
 414             break;
 415         case REG_RESET:
 416             g364fb_reset(s);
 417             break;
 418         default:
 419             error_report("g364: invalid write of 0x%" PRIx64
 420                          " at [" TARGET_FMT_plx "]", val, addr);
 421             break;
 422         }
 423     }
 424     qemu_irq_lower(s->irq);
 425 }
 426
 427 static const MemoryRegionOps g364fb_ctrl_ops = {
 428     .read = g364fb_ctrl_read,
 429     .write = g364fb_ctrl_write,
 430     .endianness = DEVICE_LITTLE_ENDIAN,
 431     .impl.min_access_size = 4,
 432     .impl.max_access_size = 4,
 433 };
 434
 435 static int g364fb_post_load(void *opaque, int version_id)
 436 {
 437     G364State *s = opaque;
 438
 439     /* force refresh */
 440     g364fb_update_depth(s);
 441     g364fb_invalidate_display(s);
 442
 443     return 0;
 444 }
 445
 446 static const VMStateDescription vmstate_g364fb = {
 447     .name = "g364fb",
 448     .version_id = 1,
 449     .minimum_version_id = 1,
 450     .post_load = g364fb_post_load,
 451     .fields = (VMStateField[]) {
 452         VMSTATE_VBUFFER_UINT32(vram, G364State, 1, NULL, vram_size),
 453         VMSTATE_BUFFER_UNSAFE(color_palette, G364State, 0, 256 * 3),
 454         VMSTATE_BUFFER_UNSAFE(cursor_palette, G364State, 0, 9),
 455         VMSTATE_UINT16_ARRAY(cursor, G364State, 512),
 456         VMSTATE_UINT32(cursor_position, G364State),
 457         VMSTATE_UINT32(ctla, G364State),
 458         VMSTATE_UINT32(top_of_screen, G364State),
 459         VMSTATE_UINT32(width, G364State),
 460         VMSTATE_UINT32(height, G364State),
 461         VMSTATE_END_OF_LIST()
 462     }
 463 };
 464
 465 static const GraphicHwOps g364fb_ops = {
 466     .invalidate  = g364fb_invalidate_display,
 467     .gfx_update  = g364fb_update_display,
 468 };
 469
 470 static void g364fb_init(DeviceState *dev, G364State *s)
 471 {
 472     s->vram = g_malloc0(s->vram_size);
 473
 474     s->con = graphic_console_init(dev, 0, &g364fb_ops, s);
 475
 476     memory_region_init_io(&s->mem_ctrl, NULL, &g364fb_ctrl_ops, s, "ctrl", 0x180000);
 477     memory_region_init_ram_ptr(&s->mem_vram, NULL, "vram",
 478                                s->vram_size, s->vram);
 479     vmstate_register_ram(&s->mem_vram, dev);
 480     memory_region_set_log(&s->mem_vram, true, DIRTY_MEMORY_VGA);
 481 }
 482
 483 #define TYPE_G364 "sysbus-g364"
 484 #define G364(obj) OBJECT_CHECK(G364SysBusState, (obj), TYPE_G364)
 485
 486 typedef struct {
 487     SysBusDevice parent_obj;
 488
 489     G364State g364;
 490 } G364SysBusState;
 491
 492 static void g364fb_sysbus_realize(DeviceState *dev, Error **errp)
 493 {
 494     G364SysBusState *sbs = G364(dev);
 495     G364State *s = &sbs->g364;
 496     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 497
 498     g364fb_init(dev, s);
 499     sysbus_init_irq(sbd, &s->irq);
 500     sysbus_init_mmio(sbd, &s->mem_ctrl);
 501     sysbus_init_mmio(sbd, &s->mem_vram);
 502 }
 503
 504 static void g364fb_sysbus_reset(DeviceState *d)
 505 {
 506     G364SysBusState *s = G364(d);
 507
 508     g364fb_reset(&s->g364);
 509 }
 510
 511 static Property g364fb_sysbus_properties[] = {
 512     DEFINE_PROP_UINT32("vram_size", G364SysBusState, g364.vram_size, 8 * MiB),
 513     DEFINE_PROP_END_OF_LIST(),
 514 };
 515
 516 static void g364fb_sysbus_class_init(ObjectClass *klass, void *data)
 517 {
 518     DeviceClass *dc = DEVICE_CLASS(klass);
 519
 520     dc->realize = g364fb_sysbus_realize;
 521     set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
 522     dc->desc = "G364 framebuffer";
 523     dc->reset = g364fb_sysbus_reset;
 524     dc->vmsd = &vmstate_g364fb;
 525     dc->props = g364fb_sysbus_properties;
 526 }
 527
 528 static const TypeInfo g364fb_sysbus_info = {
 529     .name          = TYPE_G364,
 530     .parent        = TYPE_SYS_BUS_DEVICE,
 531     .instance_size = sizeof(G364SysBusState),
 532     .class_init    = g364fb_sysbus_class_init,
 533 };
 534
 535 static void g364fb_register_types(void)
 536 {
 537     type_register_static(&g364fb_sysbus_info);
 538 }
 539
 540 type_init(g364fb_register_types)