hw/display/bochs-display.c

   1 /*
   2  * QEMU PCI bochs display adapter.
   3  *
   4  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   5  * See the COPYING file in the top-level directory.
   6  */
   7
   8 #include "qemu/osdep.h"
   9 #include "qemu/module.h"
  10 #include "qemu/units.h"
  11 #include "hw/pci/pci_device.h"
  12 #include "hw/qdev-properties.h"
  13 #include "migration/vmstate.h"
  14 #include "hw/display/bochs-vbe.h"
  15 #include "hw/display/edid.h"
  16
  17 #include "qapi/error.h"
  18
  19 #include "ui/console.h"
  20 #include "ui/qemu-pixman.h"
  21 #include "qom/object.h"
  22
  23 typedef struct BochsDisplayMode {
  24     pixman_format_code_t format;
  25     uint32_t             bytepp;
  26     uint32_t             width;
  27     uint32_t             height;
  28     uint32_t             stride;
  29     uint64_t             offset;
  30     uint64_t             size;
  31 } BochsDisplayMode;
  32
  33 struct BochsDisplayState {
  34     /* parent */
  35     PCIDevice        pci;
  36
  37     /* device elements */
  38     QemuConsole      *con;
  39     MemoryRegion     vram;
  40     MemoryRegion     mmio;
  41     MemoryRegion     vbe;
  42     MemoryRegion     qext;
  43     MemoryRegion     edid;
  44
  45     /* device config */
  46     uint64_t         vgamem;
  47     bool             enable_edid;
  48     qemu_edid_info   edid_info;
  49     uint8_t          edid_blob[256];
  50
  51     /* device registers */
  52     uint16_t         vbe_regs[VBE_DISPI_INDEX_NB];
  53     bool             big_endian_fb;
  54
  55     /* device state */
  56     BochsDisplayMode mode;
  57 };
  58
  59 #define TYPE_BOCHS_DISPLAY "bochs-display"
  60 OBJECT_DECLARE_SIMPLE_TYPE(BochsDisplayState, BOCHS_DISPLAY)
  61
  62 static const VMStateDescription vmstate_bochs_display = {
  63     .name = "bochs-display",
  64     .fields = (const VMStateField[]) {
  65         VMSTATE_PCI_DEVICE(pci, BochsDisplayState),
  66         VMSTATE_UINT16_ARRAY(vbe_regs, BochsDisplayState, VBE_DISPI_INDEX_NB),
  67         VMSTATE_BOOL(big_endian_fb, BochsDisplayState),
  68         VMSTATE_END_OF_LIST()
  69     }
  70 };
  71
  72 static uint64_t bochs_display_vbe_read(void *ptr, hwaddr addr,
  73                                        unsigned size)
  74 {
  75     BochsDisplayState *s = ptr;
  76     unsigned int index = addr >> 1;
  77
  78     switch (index) {
  79     case VBE_DISPI_INDEX_ID:
  80         return VBE_DISPI_ID5;
  81     case VBE_DISPI_INDEX_VIDEO_MEMORY_64K:
  82         return s->vgamem / (64 * KiB);
  83     }
  84
  85     if (index >= ARRAY_SIZE(s->vbe_regs)) {
  86         return -1;
  87     }
  88     return s->vbe_regs[index];
  89 }
  90
  91 static void bochs_display_vbe_write(void *ptr, hwaddr addr,
  92                                     uint64_t val, unsigned size)
  93 {
  94     BochsDisplayState *s = ptr;
  95     unsigned int index = addr >> 1;
  96
  97     if (index >= ARRAY_SIZE(s->vbe_regs)) {
  98         return;
  99     }
 100     s->vbe_regs[index] = val;
 101 }
 102
 103 static const MemoryRegionOps bochs_display_vbe_ops = {
 104     .read = bochs_display_vbe_read,
 105     .write = bochs_display_vbe_write,
 106     .valid.min_access_size = 1,
 107     .valid.max_access_size = 4,
 108     .impl.min_access_size = 2,
 109     .impl.max_access_size = 2,
 110     .endianness = DEVICE_LITTLE_ENDIAN,
 111 };
 112
 113 static uint64_t bochs_display_qext_read(void *ptr, hwaddr addr,
 114                                         unsigned size)
 115 {
 116     BochsDisplayState *s = ptr;
 117
 118     switch (addr) {
 119     case PCI_VGA_QEXT_REG_SIZE:
 120         return PCI_VGA_QEXT_SIZE;
 121     case PCI_VGA_QEXT_REG_BYTEORDER:
 122         return s->big_endian_fb ?
 123             PCI_VGA_QEXT_BIG_ENDIAN : PCI_VGA_QEXT_LITTLE_ENDIAN;
 124     default:
 125         return 0;
 126     }
 127 }
 128
 129 static void bochs_display_qext_write(void *ptr, hwaddr addr,
 130                                      uint64_t val, unsigned size)
 131 {
 132     BochsDisplayState *s = ptr;
 133
 134     switch (addr) {
 135     case PCI_VGA_QEXT_REG_BYTEORDER:
 136         if (val == PCI_VGA_QEXT_BIG_ENDIAN) {
 137             s->big_endian_fb = true;
 138         }
 139         if (val == PCI_VGA_QEXT_LITTLE_ENDIAN) {
 140             s->big_endian_fb = false;
 141         }
 142         break;
 143     }
 144 }
 145
 146 static const MemoryRegionOps bochs_display_qext_ops = {
 147     .read = bochs_display_qext_read,
 148     .write = bochs_display_qext_write,
 149     .valid.min_access_size = 4,
 150     .valid.max_access_size = 4,
 151     .endianness = DEVICE_LITTLE_ENDIAN,
 152 };
 153
 154 static int bochs_display_get_mode(BochsDisplayState *s,
 155                                    BochsDisplayMode *mode)
 156 {
 157     uint16_t *vbe = s->vbe_regs;
 158     uint32_t virt_width;
 159
 160     if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) {
 161         return -1;
 162     }
 163
 164     memset(mode, 0, sizeof(*mode));
 165     switch (vbe[VBE_DISPI_INDEX_BPP]) {
 166     case 16:
 167         /* best effort: support native endianness only */
 168         mode->format = PIXMAN_r5g6b5;
 169         mode->bytepp = 2;
 170         break;
 171     case 32:
 172         mode->format = s->big_endian_fb
 173             ? PIXMAN_BE_x8r8g8b8
 174             : PIXMAN_LE_x8r8g8b8;
 175         mode->bytepp = 4;
 176         break;
 177     default:
 178         return -1;
 179     }
 180
 181     mode->width  = vbe[VBE_DISPI_INDEX_XRES];
 182     mode->height = vbe[VBE_DISPI_INDEX_YRES];
 183     virt_width  = vbe[VBE_DISPI_INDEX_VIRT_WIDTH];
 184     if (virt_width < mode->width) {
 185         virt_width = mode->width;
 186     }
 187     mode->stride = virt_width * mode->bytepp;
 188     mode->size   = (uint64_t)mode->stride * mode->height;
 189     mode->offset = ((uint64_t)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp +
 190                     (uint64_t)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride);
 191
 192     if (mode->width < 64 || mode->height < 64) {
 193         return -1;
 194     }
 195     if (mode->offset + mode->size > s->vgamem) {
 196         return -1;
 197     }
 198     return 0;
 199 }
 200
 201 static void bochs_display_update(void *opaque)
 202 {
 203     BochsDisplayState *s = opaque;
 204     DirtyBitmapSnapshot *snap = NULL;
 205     bool full_update = false;
 206     BochsDisplayMode mode;
 207     DisplaySurface *ds;
 208     uint8_t *ptr;
 209     bool dirty;
 210     int y, ys, ret;
 211
 212     ret = bochs_display_get_mode(s, &mode);
 213     if (ret < 0) {
 214         /* no (valid) video mode */
 215         return;
 216     }
 217
 218     if (memcmp(&s->mode, &mode, sizeof(mode)) != 0) {
 219         /* video mode switch */
 220         s->mode = mode;
 221         ptr = memory_region_get_ram_ptr(&s->vram);
 222         ds = qemu_create_displaysurface_from(mode.width,
 223                                              mode.height,
 224                                              mode.format,
 225                                              mode.stride,
 226                                              ptr + mode.offset);
 227         dpy_gfx_replace_surface(s->con, ds);
 228         full_update = true;
 229     }
 230
 231     if (full_update) {
 232         dpy_gfx_update_full(s->con);
 233     } else {
 234         snap = memory_region_snapshot_and_clear_dirty(&s->vram,
 235                                                       mode.offset, mode.size,
 236                                                       DIRTY_MEMORY_VGA);
 237         ys = -1;
 238         for (y = 0; y < mode.height; y++) {
 239             dirty = memory_region_snapshot_get_dirty(&s->vram, snap,
 240                                                      mode.offset + mode.stride * y,
 241                                                      mode.stride);
 242             if (dirty && ys < 0) {
 243                 ys = y;
 244             }
 245             if (!dirty && ys >= 0) {
 246                 dpy_gfx_update(s->con, 0, ys,
 247                                mode.width, y - ys);
 248                 ys = -1;
 249             }
 250         }
 251         if (ys >= 0) {
 252             dpy_gfx_update(s->con, 0, ys,
 253                            mode.width, y - ys);
 254         }
 255
 256         g_free(snap);
 257     }
 258 }
 259
 260 static const GraphicHwOps bochs_display_gfx_ops = {
 261     .gfx_update = bochs_display_update,
 262 };
 263
 264 static void bochs_display_realize(PCIDevice *dev, Error **errp)
 265 {
 266     BochsDisplayState *s = BOCHS_DISPLAY(dev);
 267     Object *obj = OBJECT(dev);
 268     int ret;
 269
 270     if (s->vgamem < 4 * MiB) {
 271         error_setg(errp, "bochs-display: video memory too small");
 272         return;
 273     }
 274     if (s->vgamem > 256 * MiB) {
 275         error_setg(errp, "bochs-display: video memory too big");
 276         return;
 277     }
 278     s->vgamem = pow2ceil(s->vgamem);
 279
 280     s->con = graphic_console_init(DEVICE(dev), 0, &bochs_display_gfx_ops, s);
 281
 282     memory_region_init_ram(&s->vram, obj, "bochs-display-vram", s->vgamem,
 283                            &error_fatal);
 284     memory_region_init_io(&s->vbe, obj, &bochs_display_vbe_ops, s,
 285                           "bochs dispi interface", PCI_VGA_BOCHS_SIZE);
 286     memory_region_init_io(&s->qext, obj, &bochs_display_qext_ops, s,
 287                           "qemu extended regs", PCI_VGA_QEXT_SIZE);
 288
 289     memory_region_init_io(&s->mmio, obj, &unassigned_io_ops, NULL,
 290                           "bochs-display-mmio", PCI_VGA_MMIO_SIZE);
 291     memory_region_add_subregion(&s->mmio, PCI_VGA_BOCHS_OFFSET, &s->vbe);
 292     memory_region_add_subregion(&s->mmio, PCI_VGA_QEXT_OFFSET, &s->qext);
 293
 294     pci_set_byte(&s->pci.config[PCI_REVISION_ID], 2);
 295     pci_register_bar(&s->pci, 0, PCI_BASE_ADDRESS_MEM_PREFETCH, &s->vram);
 296     pci_register_bar(&s->pci, 2, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->mmio);
 297
 298     if (s->enable_edid) {
 299         qemu_edid_generate(s->edid_blob, sizeof(s->edid_blob), &s->edid_info);
 300         qemu_edid_region_io(&s->edid, obj, s->edid_blob, sizeof(s->edid_blob));
 301         memory_region_add_subregion(&s->mmio, 0, &s->edid);
 302     }
 303
 304     if (pci_bus_is_express(pci_get_bus(dev))) {
 305         ret = pcie_endpoint_cap_init(dev, 0x80);
 306         assert(ret > 0);
 307     } else {
 308         dev->cap_present &= ~QEMU_PCI_CAP_EXPRESS;
 309     }
 310
 311     memory_region_set_log(&s->vram, true, DIRTY_MEMORY_VGA);
 312 }
 313
 314 static bool bochs_display_get_big_endian_fb(Object *obj, Error **errp)
 315 {
 316     BochsDisplayState *s = BOCHS_DISPLAY(obj);
 317
 318     return s->big_endian_fb;
 319 }
 320
 321 static void bochs_display_set_big_endian_fb(Object *obj, bool value,
 322                                             Error **errp)
 323 {
 324     BochsDisplayState *s = BOCHS_DISPLAY(obj);
 325
 326     s->big_endian_fb = value;
 327 }
 328
 329 static void bochs_display_init(Object *obj)
 330 {
 331     PCIDevice *dev = PCI_DEVICE(obj);
 332
 333     /* Expose framebuffer byteorder via QOM */
 334     object_property_add_bool(obj, "big-endian-framebuffer",
 335                              bochs_display_get_big_endian_fb,
 336                              bochs_display_set_big_endian_fb);
 337
 338     dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
 339 }
 340
 341 static void bochs_display_exit(PCIDevice *dev)
 342 {
 343     BochsDisplayState *s = BOCHS_DISPLAY(dev);
 344
 345     graphic_console_close(s->con);
 346 }
 347
 348 static Property bochs_display_properties[] = {
 349     DEFINE_PROP_SIZE("vgamem", BochsDisplayState, vgamem, 16 * MiB),
 350     DEFINE_PROP_BOOL("edid", BochsDisplayState, enable_edid, true),
 351     DEFINE_EDID_PROPERTIES(BochsDisplayState, edid_info),
 352     DEFINE_PROP_END_OF_LIST(),
 353 };
 354
 355 static void bochs_display_class_init(ObjectClass *klass, void *data)
 356 {
 357     DeviceClass *dc = DEVICE_CLASS(klass);
 358     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 359
 360     k->class_id  = PCI_CLASS_DISPLAY_OTHER;
 361     k->vendor_id = PCI_VENDOR_ID_QEMU;
 362     k->device_id = PCI_DEVICE_ID_QEMU_VGA;
 363
 364     k->realize   = bochs_display_realize;
 365     k->romfile   = "vgabios-bochs-display.bin";
 366     k->exit      = bochs_display_exit;
 367     dc->vmsd     = &vmstate_bochs_display;
 368     device_class_set_props(dc, bochs_display_properties);
 369     set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
 370 }
 371
 372 static const TypeInfo bochs_display_type_info = {
 373     .name           = TYPE_BOCHS_DISPLAY,
 374     .parent         = TYPE_PCI_DEVICE,
 375     .instance_size  = sizeof(BochsDisplayState),
 376     .instance_init  = bochs_display_init,
 377     .class_init     = bochs_display_class_init,
 378     .interfaces     = (InterfaceInfo[]) {
 379         { INTERFACE_PCIE_DEVICE },
 380         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 381         { },
 382     },
 383 };
 384
 385 static void bochs_display_register_types(void)
 386 {
 387     type_register_static(&bochs_display_type_info);
 388 }
 389
 390 type_init(bochs_display_register_types)