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 "hw/irq.h"
  24 #include "hw/qdev-properties.h"
  25 #include "qapi/error.h"
  26 #include "qemu/error-report.h"
  27 #include "qemu/module.h"
  28 #include "ui/console.h"
  29 #include "ui/pixel_ops.h"
  30 #include "trace.h"
  31 #include "hw/sysbus.h"
  32 #include "migration/vmstate.h"
  33 #include "qom/object.h"
  34
  35 typedef struct G364State {
  36     /* hardware */
  37     uint32_t vram_size;
  38     qemu_irq irq;
  39     MemoryRegion mem_vram;
  40     MemoryRegion mem_ctrl;
  41     /* registers */
  42     uint8_t color_palette[256][3];
  43     uint8_t cursor_palette[3][3];
  44     uint16_t cursor[512];
  45     uint32_t cursor_position;
  46     uint32_t ctla;
  47     uint32_t top_of_screen;
  48     uint32_t width, height; /* in pixels */
  49     /* display refresh support */
  50     QemuConsole *con;
  51     int depth;
  52     int blanked;
  53 } G364State;
  54
  55 #define REG_BOOT     0x000000
  56 #define REG_DISPLAY  0x000118
  57 #define REG_VDISPLAY 0x000150
  58 #define REG_CTLA     0x000300
  59 #define REG_TOP      0x000400
  60 #define REG_CURS_PAL 0x000508
  61 #define REG_CURS_POS 0x000638
  62 #define REG_CLR_PAL  0x000800
  63 #define REG_CURS_PAT 0x001000
  64 #define REG_RESET    0x100000
  65
  66 #define CTLA_FORCE_BLANK 0x00000400
  67 #define CTLA_NO_CURSOR   0x00800000
  68
  69 #define G364_PAGE_SIZE 4096
  70
  71 static inline int check_dirty(G364State *s, DirtyBitmapSnapshot *snap, ram_addr_t page)
  72 {
  73     return memory_region_snapshot_get_dirty(&s->mem_vram, snap, page, G364_PAGE_SIZE);
  74 }
  75
  76 static void g364fb_draw_graphic8(G364State *s)
  77 {
  78     DisplaySurface *surface = qemu_console_surface(s->con);
  79     DirtyBitmapSnapshot *snap;
  80     int i, w;
  81     uint8_t *vram;
  82     uint8_t *data_display, *dd;
  83     ram_addr_t page;
  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 (surface_bits_per_pixel(surface)) {
  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                      surface_bits_per_pixel(surface));
 110             return;
 111     }
 112
 113     page = 0;
 114
 115     x = y = 0;
 116     xmin = s->width;
 117     xmax = 0;
 118     ymin = s->height;
 119     ymax = 0;
 120
 121     if (!(s->ctla & CTLA_NO_CURSOR)) {
 122         xcursor = s->cursor_position >> 12;
 123         ycursor = s->cursor_position & 0xfff;
 124     } else {
 125         xcursor = ycursor = -65;
 126     }
 127
 128     vram = memory_region_get_ram_ptr(&s->mem_vram) + s->top_of_screen;
 129     /* XXX: out of range in vram? */
 130     data_display = dd = surface_data(surface);
 131     snap = memory_region_snapshot_and_clear_dirty(&s->mem_vram, 0, s->vram_size,
 132                                                   DIRTY_MEMORY_VGA);
 133     while (y < s->height) {
 134         if (check_dirty(s, snap, page)) {
 135             if (y < ymin)
 136                 ymin = ymax = y;
 137             if (x < xmin)
 138                 xmin = x;
 139             for (i = 0; i < G364_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 + surface_stride(surface);
 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 (xmax || ymax) {
 194                 dpy_gfx_update(s->con, xmin, ymin,
 195                                xmax - xmin + 1, ymax - ymin + 1);
 196                 xmin = s->width;
 197                 xmax = 0;
 198                 ymin = s->height;
 199                 ymax = 0;
 200             }
 201             x += G364_PAGE_SIZE;
 202             dy = x / s->width;
 203             x = x % s->width;
 204             y += dy;
 205             vram += G364_PAGE_SIZE;
 206             data_display += dy * surface_stride(surface);
 207             dd = data_display + x * w;
 208         }
 209         page += G364_PAGE_SIZE;
 210     }
 211
 212 done:
 213     if (xmax || ymax) {
 214         dpy_gfx_update(s->con, xmin, ymin, xmax - xmin + 1, ymax - ymin + 1);
 215     }
 216     g_free(snap);
 217 }
 218
 219 static void g364fb_draw_blank(G364State *s)
 220 {
 221     DisplaySurface *surface = qemu_console_surface(s->con);
 222     int i, w;
 223     uint8_t *d;
 224
 225     if (s->blanked) {
 226         /* Screen is already blank. No need to redraw it */
 227         return;
 228     }
 229
 230     w = s->width * surface_bytes_per_pixel(surface);
 231     d = surface_data(surface);
 232     for (i = 0; i < s->height; i++) {
 233         memset(d, 0, w);
 234         d += surface_stride(surface);
 235     }
 236
 237     dpy_gfx_update_full(s->con);
 238     s->blanked = 1;
 239 }
 240
 241 static void g364fb_update_display(void *opaque)
 242 {
 243     G364State *s = opaque;
 244     DisplaySurface *surface = qemu_console_surface(s->con);
 245
 246     qemu_flush_coalesced_mmio_buffer();
 247
 248     if (s->width == 0 || s->height == 0)
 249         return;
 250
 251     if (s->width != surface_width(surface) ||
 252         s->height != surface_height(surface)) {
 253         qemu_console_resize(s->con, s->width, s->height);
 254     }
 255
 256     if (s->ctla & CTLA_FORCE_BLANK) {
 257         g364fb_draw_blank(s);
 258     } else if (s->depth == 8) {
 259         g364fb_draw_graphic8(s);
 260     } else {
 261         error_report("g364: unknown guest depth %d", s->depth);
 262     }
 263
 264     qemu_irq_raise(s->irq);
 265 }
 266
 267 static inline void g364fb_invalidate_display(void *opaque)
 268 {
 269     G364State *s = opaque;
 270
 271     s->blanked = 0;
 272     memory_region_set_dirty(&s->mem_vram, 0, s->vram_size);
 273 }
 274
 275 static void g364fb_reset(G364State *s)
 276 {
 277     uint8_t *vram = memory_region_get_ram_ptr(&s->mem_vram);
 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(vram, 0, s->vram_size);
 289     g364fb_invalidate_display(s);
 290 }
 291
 292 /* called for accesses to io ports */
 293 static uint64_t g364fb_ctrl_read(void *opaque,
 294                                  hwaddr addr,
 295                                  unsigned int size)
 296 {
 297     G364State *s = opaque;
 298     uint32_t val;
 299
 300     if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 301         /* cursor pattern */
 302         int idx = (addr - REG_CURS_PAT) >> 3;
 303         val = s->cursor[idx];
 304     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 305         /* cursor palette */
 306         int idx = (addr - REG_CURS_PAL) >> 3;
 307         val = ((uint32_t)s->cursor_palette[idx][0] << 16);
 308         val |= ((uint32_t)s->cursor_palette[idx][1] << 8);
 309         val |= ((uint32_t)s->cursor_palette[idx][2] << 0);
 310     } else {
 311         switch (addr) {
 312             case REG_DISPLAY:
 313                 val = s->width / 4;
 314                 break;
 315             case REG_VDISPLAY:
 316                 val = s->height * 2;
 317                 break;
 318             case REG_CTLA:
 319                 val = s->ctla;
 320                 break;
 321             default:
 322             {
 323                 error_report("g364: invalid read at [" TARGET_FMT_plx "]",
 324                              addr);
 325                 val = 0;
 326                 break;
 327             }
 328         }
 329     }
 330
 331     trace_g364fb_read(addr, val);
 332
 333     return val;
 334 }
 335
 336 static void g364fb_update_depth(G364State *s)
 337 {
 338     static const int depths[8] = { 1, 2, 4, 8, 15, 16, 0 };
 339     s->depth = depths[(s->ctla & 0x00700000) >> 20];
 340 }
 341
 342 static void g364_invalidate_cursor_position(G364State *s)
 343 {
 344     DisplaySurface *surface = qemu_console_surface(s->con);
 345     int ymin, ymax, start, end;
 346
 347     /* invalidate only near the cursor */
 348     ymin = s->cursor_position & 0xfff;
 349     ymax = MIN(s->height, ymin + 64);
 350     start = ymin * surface_stride(surface);
 351     end = (ymax + 1) * surface_stride(surface);
 352
 353     memory_region_set_dirty(&s->mem_vram, start, end - start);
 354 }
 355
 356 static void g364fb_ctrl_write(void *opaque,
 357                               hwaddr addr,
 358                               uint64_t val,
 359                               unsigned int size)
 360 {
 361     G364State *s = opaque;
 362
 363     trace_g364fb_write(addr, val);
 364
 365     if (addr >= REG_CLR_PAL && addr < REG_CLR_PAL + 0x800) {
 366         /* color palette */
 367         int idx = (addr - REG_CLR_PAL) >> 3;
 368         s->color_palette[idx][0] = (val >> 16) & 0xff;
 369         s->color_palette[idx][1] = (val >> 8) & 0xff;
 370         s->color_palette[idx][2] = val & 0xff;
 371         g364fb_invalidate_display(s);
 372     } else if (addr >= REG_CURS_PAT && addr < REG_CURS_PAT + 0x1000) {
 373         /* cursor pattern */
 374         int idx = (addr - REG_CURS_PAT) >> 3;
 375         s->cursor[idx] = val;
 376         g364fb_invalidate_display(s);
 377     } else if (addr >= REG_CURS_PAL && addr < REG_CURS_PAL + 0x18) {
 378         /* cursor palette */
 379         int idx = (addr - REG_CURS_PAL) >> 3;
 380         s->cursor_palette[idx][0] = (val >> 16) & 0xff;
 381         s->cursor_palette[idx][1] = (val >> 8) & 0xff;
 382         s->cursor_palette[idx][2] = val & 0xff;
 383         g364fb_invalidate_display(s);
 384     } else {
 385         switch (addr) {
 386         case REG_BOOT: /* Boot timing */
 387         case 0x00108: /* Line timing: half sync */
 388         case 0x00110: /* Line timing: back porch */
 389         case 0x00120: /* Line timing: short display */
 390         case 0x00128: /* Frame timing: broad pulse */
 391         case 0x00130: /* Frame timing: v sync */
 392         case 0x00138: /* Frame timing: v preequalise */
 393         case 0x00140: /* Frame timing: v postequalise */
 394         case 0x00148: /* Frame timing: v blank */
 395         case 0x00158: /* Line timing: line time */
 396         case 0x00160: /* Frame store: line start */
 397         case 0x00168: /* vram cycle: mem init */
 398         case 0x00170: /* vram cycle: transfer delay */
 399         case 0x00200: /* vram cycle: mask register */
 400             /* ignore */
 401             break;
 402         case REG_TOP:
 403             s->top_of_screen = val;
 404             g364fb_invalidate_display(s);
 405             break;
 406         case REG_DISPLAY:
 407             s->width = val * 4;
 408             break;
 409         case REG_VDISPLAY:
 410             s->height = val / 2;
 411             break;
 412         case REG_CTLA:
 413             s->ctla = val;
 414             g364fb_update_depth(s);
 415             g364fb_invalidate_display(s);
 416             break;
 417         case REG_CURS_POS:
 418             g364_invalidate_cursor_position(s);
 419             s->cursor_position = val;
 420             g364_invalidate_cursor_position(s);
 421             break;
 422         case REG_RESET:
 423             g364fb_reset(s);
 424             break;
 425         default:
 426             error_report("g364: invalid write of 0x%" PRIx64
 427                          " at [" TARGET_FMT_plx "]", val, addr);
 428             break;
 429         }
 430     }
 431     qemu_irq_lower(s->irq);
 432 }
 433
 434 static const MemoryRegionOps g364fb_ctrl_ops = {
 435     .read = g364fb_ctrl_read,
 436     .write = g364fb_ctrl_write,
 437     .endianness = DEVICE_LITTLE_ENDIAN,
 438     .impl.min_access_size = 4,
 439     .impl.max_access_size = 4,
 440 };
 441
 442 static int g364fb_post_load(void *opaque, int version_id)
 443 {
 444     G364State *s = opaque;
 445
 446     /* force refresh */
 447     g364fb_update_depth(s);
 448     g364fb_invalidate_display(s);
 449
 450     return 0;
 451 }
 452
 453 static const VMStateDescription vmstate_g364fb = {
 454     .name = "g364fb",
 455     .version_id = 2,
 456     .minimum_version_id = 2,
 457     .post_load = g364fb_post_load,
 458     .fields = (VMStateField[]) {
 459         VMSTATE_BUFFER_UNSAFE(color_palette, G364State, 0, 256 * 3),
 460         VMSTATE_BUFFER_UNSAFE(cursor_palette, G364State, 0, 9),
 461         VMSTATE_UINT16_ARRAY(cursor, G364State, 512),
 462         VMSTATE_UINT32(cursor_position, G364State),
 463         VMSTATE_UINT32(ctla, G364State),
 464         VMSTATE_UINT32(top_of_screen, G364State),
 465         VMSTATE_UINT32(width, G364State),
 466         VMSTATE_UINT32(height, G364State),
 467         VMSTATE_END_OF_LIST()
 468     }
 469 };
 470
 471 static const GraphicHwOps g364fb_ops = {
 472     .invalidate  = g364fb_invalidate_display,
 473     .gfx_update  = g364fb_update_display,
 474 };
 475
 476 static void g364fb_init(DeviceState *dev, G364State *s)
 477 {
 478     s->con = graphic_console_init(dev, 0, &g364fb_ops, s);
 479
 480     memory_region_init_io(&s->mem_ctrl, OBJECT(dev), &g364fb_ctrl_ops, s,
 481                           "ctrl", 0x180000);
 482     memory_region_init_ram(&s->mem_vram, NULL, "g364fb.vram", s->vram_size,
 483                            &error_fatal);
 484     memory_region_set_log(&s->mem_vram, true, DIRTY_MEMORY_VGA);
 485 }
 486
 487 #define TYPE_G364 "sysbus-g364"
 488 OBJECT_DECLARE_SIMPLE_TYPE(G364SysBusState, G364)
 489
 490 struct G364SysBusState {
 491     SysBusDevice parent_obj;
 492
 493     G364State g364;
 494 };
 495
 496 static void g364fb_sysbus_realize(DeviceState *dev, Error **errp)
 497 {
 498     G364SysBusState *sbs = G364(dev);
 499     G364State *s = &sbs->g364;
 500     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 501
 502     g364fb_init(dev, s);
 503     sysbus_init_irq(sbd, &s->irq);
 504     sysbus_init_mmio(sbd, &s->mem_ctrl);
 505     sysbus_init_mmio(sbd, &s->mem_vram);
 506 }
 507
 508 static void g364fb_sysbus_reset(DeviceState *d)
 509 {
 510     G364SysBusState *s = G364(d);
 511
 512     g364fb_reset(&s->g364);
 513 }
 514
 515 static Property g364fb_sysbus_properties[] = {
 516     DEFINE_PROP_UINT32("vram_size", G364SysBusState, g364.vram_size, 8 * MiB),
 517     DEFINE_PROP_END_OF_LIST(),
 518 };
 519
 520 static const VMStateDescription vmstate_g364fb_sysbus = {
 521     .name = "g364fb-sysbus",
 522     .version_id = 2,
 523     .minimum_version_id = 2,
 524     .fields = (VMStateField[]) {
 525         VMSTATE_STRUCT(g364, G364SysBusState, 2, vmstate_g364fb, G364State),
 526         VMSTATE_END_OF_LIST()
 527     }
 528 };
 529
 530 static void g364fb_sysbus_class_init(ObjectClass *klass, void *data)
 531 {
 532     DeviceClass *dc = DEVICE_CLASS(klass);
 533
 534     dc->realize = g364fb_sysbus_realize;
 535     set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
 536     dc->desc = "G364 framebuffer";
 537     dc->reset = g364fb_sysbus_reset;
 538     dc->vmsd = &vmstate_g364fb_sysbus;
 539     device_class_set_props(dc, g364fb_sysbus_properties);
 540 }
 541
 542 static const TypeInfo g364fb_sysbus_info = {
 543     .name          = TYPE_G364,
 544     .parent        = TYPE_SYS_BUS_DEVICE,
 545     .instance_size = sizeof(G364SysBusState),
 546     .class_init    = g364fb_sysbus_class_init,
 547 };
 548
 549 static void g364fb_register_types(void)
 550 {
 551     type_register_static(&g364fb_sysbus_info);
 552 }
 553
 554 type_init(g364fb_register_types)