diff options
Diffstat (limited to 'hw/display/bochs-display.c')
| -rw-r--r-- | hw/display/bochs-display.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/hw/display/bochs-display.c b/hw/display/bochs-display.c new file mode 100644 index 0000000000..c33524b558 --- /dev/null +++ b/hw/display/bochs-display.c @@ -0,0 +1,363 @@ +/* + * QEMU PCI bochs display adapter. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ +#include "qemu/osdep.h" +#include "hw/hw.h" +#include "hw/pci/pci.h" +#include "hw/display/bochs-vbe.h" + +#include "qapi/error.h" + +#include "ui/console.h" +#include "ui/qemu-pixman.h" + +typedef struct BochsDisplayMode { + pixman_format_code_t format; + uint32_t bytepp; + uint32_t width; + uint32_t height; + uint32_t stride; + uint64_t offset; + uint64_t size; +} BochsDisplayMode; + +typedef struct BochsDisplayState { + /* parent */ + PCIDevice pci; + + /* device elements */ + QemuConsole *con; + MemoryRegion vram; + MemoryRegion mmio; + MemoryRegion vbe; + MemoryRegion qext; + + /* device config */ + uint64_t vgamem; + + /* device registers */ + uint16_t vbe_regs[VBE_DISPI_INDEX_NB]; + bool big_endian_fb; + + /* device state */ + BochsDisplayMode mode; +} BochsDisplayState; + +#define TYPE_BOCHS_DISPLAY "bochs-display" +#define BOCHS_DISPLAY(obj) OBJECT_CHECK(BochsDisplayState, (obj), \ + TYPE_BOCHS_DISPLAY) + +static const VMStateDescription vmstate_bochs_display = { + .name = "bochs-display", + .fields = (VMStateField[]) { + VMSTATE_PCI_DEVICE(pci, BochsDisplayState), + VMSTATE_UINT16_ARRAY(vbe_regs, BochsDisplayState, VBE_DISPI_INDEX_NB), + VMSTATE_BOOL(big_endian_fb, BochsDisplayState), + VMSTATE_END_OF_LIST() + } +}; + +static uint64_t bochs_display_vbe_read(void *ptr, hwaddr addr, + unsigned size) +{ + BochsDisplayState *s = ptr; + unsigned int index = addr >> 1; + + switch (index) { + case VBE_DISPI_INDEX_ID: + return VBE_DISPI_ID5; + case VBE_DISPI_INDEX_VIDEO_MEMORY_64K: + return s->vgamem / (64 * 1024); + } + + if (index >= ARRAY_SIZE(s->vbe_regs)) { + return -1; + } + return s->vbe_regs[index]; +} + +static void bochs_display_vbe_write(void *ptr, hwaddr addr, + uint64_t val, unsigned size) +{ + BochsDisplayState *s = ptr; + unsigned int index = addr >> 1; + + if (index >= ARRAY_SIZE(s->vbe_regs)) { + return; + } + s->vbe_regs[index] = val; +} + +static const MemoryRegionOps bochs_display_vbe_ops = { + .read = bochs_display_vbe_read, + .write = bochs_display_vbe_write, + .valid.min_access_size = 1, + .valid.max_access_size = 4, + .impl.min_access_size = 2, + .impl.max_access_size = 2, + .endianness = DEVICE_LITTLE_ENDIAN, +}; + +static uint64_t bochs_display_qext_read(void *ptr, hwaddr addr, + unsigned size) +{ + BochsDisplayState *s = ptr; + + switch (addr) { + case PCI_VGA_QEXT_REG_SIZE: + return PCI_VGA_QEXT_SIZE; + case PCI_VGA_QEXT_REG_BYTEORDER: + return s->big_endian_fb ? + PCI_VGA_QEXT_BIG_ENDIAN : PCI_VGA_QEXT_LITTLE_ENDIAN; + default: + return 0; + } +} + +static void bochs_display_qext_write(void *ptr, hwaddr addr, + uint64_t val, unsigned size) +{ + BochsDisplayState *s = ptr; + + switch (addr) { + case PCI_VGA_QEXT_REG_BYTEORDER: + if (val == PCI_VGA_QEXT_BIG_ENDIAN) { + s->big_endian_fb = true; + } + if (val == PCI_VGA_QEXT_LITTLE_ENDIAN) { + s->big_endian_fb = false; + } + break; + } +} + +static const MemoryRegionOps bochs_display_qext_ops = { + .read = bochs_display_qext_read, + .write = bochs_display_qext_write, + .valid.min_access_size = 4, + .valid.max_access_size = 4, + .endianness = DEVICE_LITTLE_ENDIAN, +}; + +static int bochs_display_get_mode(BochsDisplayState *s, + BochsDisplayMode *mode) +{ + uint16_t *vbe = s->vbe_regs; + uint32_t virt_width; + + if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) { + return -1; + } + + memset(mode, 0, sizeof(*mode)); + switch (vbe[VBE_DISPI_INDEX_BPP]) { + case 16: + /* best effort: support native endianess only */ + mode->format = PIXMAN_r5g6b5; + mode->bytepp = 2; + case 32: + mode->format = s->big_endian_fb + ? PIXMAN_BE_x8r8g8b8 + : PIXMAN_LE_x8r8g8b8; + mode->bytepp = 4; + break; + default: + return -1; + } + + mode->width = vbe[VBE_DISPI_INDEX_XRES]; + mode->height = vbe[VBE_DISPI_INDEX_YRES]; + virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH]; + if (virt_width < mode->width) { + virt_width = mode->width; + } + mode->stride = virt_width * mode->bytepp; + mode->size = (uint64_t)mode->stride * mode->height; + mode->offset = ((uint64_t)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp + + (uint64_t)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride); + + if (mode->width < 64 || mode->height < 64) { + return -1; + } + if (mode->offset + mode->size > s->vgamem) { + return -1; + } + return 0; +} + +static void bochs_display_update(void *opaque) +{ + BochsDisplayState *s = opaque; + DirtyBitmapSnapshot *snap = NULL; + bool full_update = false; + BochsDisplayMode mode; + DisplaySurface *ds; + uint8_t *ptr; + bool dirty; + int y, ys, ret; + + ret = bochs_display_get_mode(s, &mode); + if (ret < 0) { + /* no (valid) video mode */ + return; + } + + if (memcmp(&s->mode, &mode, sizeof(mode)) != 0) { + /* video mode switch */ + s->mode = mode; + ptr = memory_region_get_ram_ptr(&s->vram); + ds = qemu_create_displaysurface_from(mode.width, + mode.height, + mode.format, + mode.stride, + ptr + mode.offset); + dpy_gfx_replace_surface(s->con, ds); + full_update = true; + } + + if (full_update) { + dpy_gfx_update_full(s->con); + } else { + snap = memory_region_snapshot_and_clear_dirty(&s->vram, + mode.offset, mode.size, + DIRTY_MEMORY_VGA); + ys = -1; + for (y = 0; y < mode.height; y++) { + dirty = memory_region_snapshot_get_dirty(&s->vram, snap, + mode.offset + mode.stride * y, + mode.stride); + if (dirty && ys < 0) { + ys = y; + } + if (!dirty && ys >= 0) { + dpy_gfx_update(s->con, 0, ys, + mode.width, y - ys); + ys = -1; + } + } + if (ys >= 0) { + dpy_gfx_update(s->con, 0, ys, + mode.width, y - ys); + } + } +} + +static const GraphicHwOps bochs_display_gfx_ops = { + .gfx_update = bochs_display_update, +}; + +static void bochs_display_realize(PCIDevice *dev, Error **errp) +{ + BochsDisplayState *s = BOCHS_DISPLAY(dev); + Object *obj = OBJECT(dev); + int ret; + + s->con = graphic_console_init(DEVICE(dev), 0, &bochs_display_gfx_ops, s); + + if (s->vgamem < (4 * 1024 * 1024)) { + error_setg(errp, "bochs-display: video memory too small"); + } + if (s->vgamem > (256 * 1024 * 1024)) { + error_setg(errp, "bochs-display: video memory too big"); + } + s->vgamem = pow2ceil(s->vgamem); + + memory_region_init_ram(&s->vram, obj, "bochs-display-vram", s->vgamem, + &error_fatal); + memory_region_init_io(&s->vbe, obj, &bochs_display_vbe_ops, s, + "bochs dispi interface", PCI_VGA_BOCHS_SIZE); + memory_region_init_io(&s->qext, obj, &bochs_display_qext_ops, s, + "qemu extended regs", PCI_VGA_QEXT_SIZE); + + memory_region_init(&s->mmio, obj, "bochs-display-mmio", + PCI_VGA_MMIO_SIZE); + memory_region_add_subregion(&s->mmio, PCI_VGA_BOCHS_OFFSET, &s->vbe); + memory_region_add_subregion(&s->mmio, PCI_VGA_QEXT_OFFSET, &s->qext); + + pci_set_byte(&s->pci.config[PCI_REVISION_ID], 2); + pci_register_bar(&s->pci, 0, PCI_BASE_ADDRESS_MEM_PREFETCH, &s->vram); + pci_register_bar(&s->pci, 2, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->mmio); + + if (pci_bus_is_express(pci_get_bus(dev))) { + dev->cap_present |= QEMU_PCI_CAP_EXPRESS; + ret = pcie_endpoint_cap_init(dev, 0x80); + assert(ret > 0); + } + + memory_region_set_log(&s->vram, true, DIRTY_MEMORY_VGA); +} + +static bool bochs_display_get_big_endian_fb(Object *obj, Error **errp) +{ + BochsDisplayState *s = BOCHS_DISPLAY(obj); + + return s->big_endian_fb; +} + +static void bochs_display_set_big_endian_fb(Object *obj, bool value, + Error **errp) +{ + BochsDisplayState *s = BOCHS_DISPLAY(obj); + + s->big_endian_fb = value; +} + +static void bochs_display_init(Object *obj) +{ + /* Expose framebuffer byteorder via QOM */ + object_property_add_bool(obj, "big-endian-framebuffer", + bochs_display_get_big_endian_fb, + bochs_display_set_big_endian_fb, + NULL); +} + +static void bochs_display_exit(PCIDevice *dev) +{ + BochsDisplayState *s = BOCHS_DISPLAY(dev); + + graphic_console_close(s->con); +} + +static Property bochs_display_properties[] = { + DEFINE_PROP_SIZE("vgamem", BochsDisplayState, vgamem, 16 * 1024 * 1024), + DEFINE_PROP_END_OF_LIST(), +}; + +static void bochs_display_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); + + k->class_id = PCI_CLASS_DISPLAY_OTHER; + k->vendor_id = PCI_VENDOR_ID_QEMU; + k->device_id = PCI_DEVICE_ID_QEMU_VGA; + + k->realize = bochs_display_realize; + k->exit = bochs_display_exit; + dc->vmsd = &vmstate_bochs_display; + dc->props = bochs_display_properties; + set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories); +} + +static const TypeInfo bochs_display_type_info = { + .name = TYPE_BOCHS_DISPLAY, + .parent = TYPE_PCI_DEVICE, + .instance_size = sizeof(BochsDisplayState), + .instance_init = bochs_display_init, + .class_init = bochs_display_class_init, + .interfaces = (InterfaceInfo[]) { + { INTERFACE_PCIE_DEVICE }, + { INTERFACE_CONVENTIONAL_PCI_DEVICE }, + { }, + }, +}; + +static void bochs_display_register_types(void) +{ + type_register_static(&bochs_display_type_info); +} + +type_init(bochs_display_register_types) |