hw/display/cg3.c - third_party/qemu - Git at Google

 /*
  * QEMU CG3 Frame buffer
  *
  * Copyright (c) 2012 Bob Breuer
  * Copyright (c) 2013 Mark Cave-Ayland
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */

 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu/datadir.h"
 #include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "ui/console.h"
 #include "hw/sysbus.h"
 #include "migration/vmstate.h"
 #include "hw/irq.h"
 #include "hw/loader.h"
 #include "hw/qdev-properties.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
 #include "trace.h"
 #include "qom/object.h"

 /* Change to 1 to enable debugging */
 #define DEBUG_CG3 0

 #define CG3_ROM_FILE  "QEMU,cgthree.bin"
 #define FCODE_MAX_ROM_SIZE 0x10000

 #define CG3_REG_SIZE            0x20

 #define CG3_REG_BT458_ADDR      0x0
 #define CG3_REG_BT458_COLMAP    0x4
 #define CG3_REG_FBC_CTRL        0x10
 #define CG3_REG_FBC_STATUS      0x11
 #define CG3_REG_FBC_CURSTART    0x12
 #define CG3_REG_FBC_CUREND      0x13
 #define CG3_REG_FBC_VCTRL       0x14

 /* Control register flags */
 #define CG3_CR_ENABLE_INTS      0x80

 /* Status register flags */
 #define CG3_SR_PENDING_INT      0x80
 #define CG3_SR_1152_900_76_B    0x60
 #define CG3_SR_ID_COLOR         0x01

 #define CG3_VRAM_SIZE 0x100000
 #define CG3_VRAM_OFFSET 0x800000

 #define TYPE_CG3 "cgthree"
 OBJECT_DECLARE_SIMPLE_TYPE(CG3State, CG3)

 struct CG3State {
     SysBusDevice parent_obj;

     QemuConsole *con;
     qemu_irq irq;
     hwaddr prom_addr;
     MemoryRegion vram_mem;
     MemoryRegion rom;
     MemoryRegion reg;
     uint32_t vram_size;
     int full_update;
     uint8_t regs[16];
     uint8_t r[256], g[256], b[256];
     uint16_t width, height, depth;
     uint8_t dac_index, dac_state;
 };

 static void cg3_update_display(void *opaque)
 {
     CG3State *s = opaque;
     DisplaySurface *surface = qemu_console_surface(s->con);
     const uint8_t *pix;
     uint32_t *data;
     uint32_t dval;
     int x, y, y_start;
     unsigned int width, height;
     ram_addr_t page;
     DirtyBitmapSnapshot *snap = NULL;

     if (surface_bits_per_pixel(surface) != 32) {
         return;
     }
     width = s->width;
     height = s->height;

     y_start = -1;
     pix = memory_region_get_ram_ptr(&s->vram_mem);
     data = (uint32_t *)surface_data(surface);

     if (!s->full_update) {
         snap = memory_region_snapshot_and_clear_dirty(&s->vram_mem, 0x0,
                                               memory_region_size(&s->vram_mem),
                                               DIRTY_MEMORY_VGA);
     }

     for (y = 0; y < height; y++) {
         int update;

         page = (ram_addr_t)y * width;

         if (s->full_update) {
             update = 1;
         } else {
             update = memory_region_snapshot_get_dirty(&s->vram_mem, snap, page,
                                                       width);
         }

         if (update) {
             if (y_start < 0) {
                 y_start = y;
             }

             for (x = 0; x < width; x++) {
                 dval = *pix++;
                 dval = (s->r[dval] << 16) | (s->g[dval] << 8) | s->b[dval];
                 *data++ = dval;
             }
         } else {
             if (y_start >= 0) {
                 dpy_gfx_update(s->con, 0, y_start, width, y - y_start);
                 y_start = -1;
             }
             pix += width;
             data += width;
         }
     }
     s->full_update = 0;
     if (y_start >= 0) {
         dpy_gfx_update(s->con, 0, y_start, width, y - y_start);
     }
     /* vsync interrupt? */
     if (s->regs[0] & CG3_CR_ENABLE_INTS) {
         s->regs[1] |= CG3_SR_PENDING_INT;
         qemu_irq_raise(s->irq);
     }
     g_free(snap);
 }

 static void cg3_invalidate_display(void *opaque)
 {
     CG3State *s = opaque;

     memory_region_set_dirty(&s->vram_mem, 0, CG3_VRAM_SIZE);
 }

 static uint64_t cg3_reg_read(void *opaque, hwaddr addr, unsigned size)
 {
     CG3State *s = opaque;
     int val;

     switch (addr) {
     case CG3_REG_BT458_ADDR:
     case CG3_REG_BT458_COLMAP:
         val = 0;
         break;
     case CG3_REG_FBC_CTRL:
         val = s->regs[0];
         break;
     case CG3_REG_FBC_STATUS:
         /* monitor ID 6, board type = 1 (color) */
         val = s->regs[1] | CG3_SR_1152_900_76_B | CG3_SR_ID_COLOR;
         break;
     case CG3_REG_FBC_CURSTART ... CG3_REG_SIZE - 1:
         val = s->regs[addr - 0x10];
         break;
     default:
         qemu_log_mask(LOG_UNIMP,
                   "cg3: Unimplemented register read "
                   "reg 0x%" HWADDR_PRIx " size 0x%x\n",
                   addr, size);
         val = 0;
         break;
     }
     trace_cg3_read(addr, val, size);

     return val;
 }

 static void cg3_reg_write(void *opaque, hwaddr addr, uint64_t val,
                           unsigned size)
 {
     CG3State *s = opaque;
     uint8_t regval;
     int i;

     trace_cg3_write(addr, val, size);
     switch (addr) {
     case CG3_REG_BT458_ADDR:
         s->dac_index = val;
         s->dac_state = 0;
         break;
     case CG3_REG_BT458_COLMAP:
         /* This register can be written to as either a long word or a byte */
         if (size == 1) {
             val <<= 24;
         }

         for (i = 0; i < size; i++) {
             regval = val >> 24;

             switch (s->dac_state) {
             case 0:
                 s->r[s->dac_index] = regval;
                 s->dac_state++;
                 break;
             case 1:
                 s->g[s->dac_index] = regval;
                 s->dac_state++;
                 break;
             case 2:
                 s->b[s->dac_index] = regval;
                 /* Index autoincrement */
                 s->dac_index = (s->dac_index + 1) & 0xff;
                 /* fall through */
             default:
                 s->dac_state = 0;
                 break;
             }
             val <<= 8;
         }
         s->full_update = 1;
         break;
     case CG3_REG_FBC_CTRL:
         s->regs[0] = val;
         break;
     case CG3_REG_FBC_STATUS:
         if (s->regs[1] & CG3_SR_PENDING_INT) {
             /* clear interrupt */
             s->regs[1] &= ~CG3_SR_PENDING_INT;
             qemu_irq_lower(s->irq);
         }
         break;
     case CG3_REG_FBC_CURSTART ... CG3_REG_SIZE - 1:
         s->regs[addr - 0x10] = val;
         break;
     default:
         qemu_log_mask(LOG_UNIMP,
                   "cg3: Unimplemented register write "
                   "reg 0x%" HWADDR_PRIx " size 0x%x value 0x%" PRIx64 "\n",
                   addr, size, val);
         break;
     }
 }

 static const MemoryRegionOps cg3_reg_ops = {
     .read = cg3_reg_read,
     .write = cg3_reg_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
     .valid = {
         .min_access_size = 1,
         .max_access_size = 4,
     },
 };

 static const GraphicHwOps cg3_ops = {
     .invalidate = cg3_invalidate_display,
     .gfx_update = cg3_update_display,
 };

 static void cg3_initfn(Object *obj)
 {
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
     CG3State *s = CG3(obj);

     memory_region_init_rom_nomigrate(&s->rom, obj, "cg3.prom",
                                      FCODE_MAX_ROM_SIZE, &error_fatal);
     sysbus_init_mmio(sbd, &s->rom);

     memory_region_init_io(&s->reg, obj, &cg3_reg_ops, s, "cg3.reg",
                           CG3_REG_SIZE);
     sysbus_init_mmio(sbd, &s->reg);
 }

 static void cg3_realizefn(DeviceState *dev, Error **errp)
 {
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
     CG3State *s = CG3(dev);
     int ret;
     char *fcode_filename;

     /* FCode ROM */
     vmstate_register_ram_global(&s->rom);
     fcode_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, CG3_ROM_FILE);
     if (fcode_filename) {
         ret = load_image_mr(fcode_filename, &s->rom);
         g_free(fcode_filename);
         if (ret < 0 || ret > FCODE_MAX_ROM_SIZE) {
             warn_report("cg3: could not load prom '%s'", CG3_ROM_FILE);
         }
     }

     memory_region_init_ram(&s->vram_mem, NULL, "cg3.vram", s->vram_size,
                            &error_fatal);
     memory_region_set_log(&s->vram_mem, true, DIRTY_MEMORY_VGA);
     sysbus_init_mmio(sbd, &s->vram_mem);

     sysbus_init_irq(sbd, &s->irq);

     s->con = graphic_console_init(dev, 0, &cg3_ops, s);
     qemu_console_resize(s->con, s->width, s->height);
 }

 static int vmstate_cg3_post_load(void *opaque, int version_id)
 {
     CG3State *s = opaque;

     cg3_invalidate_display(s);

     return 0;
 }

 static const VMStateDescription vmstate_cg3 = {
     .name = "cg3",
     .version_id = 1,
     .minimum_version_id = 1,
     .post_load = vmstate_cg3_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_UINT16(height, CG3State),
         VMSTATE_UINT16(width, CG3State),
         VMSTATE_UINT16(depth, CG3State),
         VMSTATE_BUFFER(r, CG3State),
         VMSTATE_BUFFER(g, CG3State),
         VMSTATE_BUFFER(b, CG3State),
         VMSTATE_UINT8(dac_index, CG3State),
         VMSTATE_UINT8(dac_state, CG3State),
         VMSTATE_END_OF_LIST()
     }
 };

 static void cg3_reset(DeviceState *d)
 {
     CG3State *s = CG3(d);

     /* Initialize palette */
     memset(s->r, 0, 256);
     memset(s->g, 0, 256);
     memset(s->b, 0, 256);

     s->dac_state = 0;
     s->full_update = 1;
     qemu_irq_lower(s->irq);
 }

 static Property cg3_properties[] = {
     DEFINE_PROP_UINT32("vram-size",    CG3State, vram_size, -1),
     DEFINE_PROP_UINT16("width",        CG3State, width,     -1),
     DEFINE_PROP_UINT16("height",       CG3State, height,    -1),
     DEFINE_PROP_UINT16("depth",        CG3State, depth,     -1),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void cg3_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     dc->realize = cg3_realizefn;
     dc->reset = cg3_reset;
     dc->vmsd = &vmstate_cg3;
     device_class_set_props(dc, cg3_properties);
 }

 static const TypeInfo cg3_info = {
     .name          = TYPE_CG3,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(CG3State),
     .instance_init = cg3_initfn,
     .class_init    = cg3_class_init,
 };

 static void cg3_register_types(void)
 {
     type_register_static(&cg3_info);
 }

 type_init(cg3_register_types)
	/*
	* QEMU CG3 Frame buffer
	*
	* Copyright (c) 2012 Bob Breuer
	* Copyright (c) 2013 Mark Cave-Ayland
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/

	#include "qemu/osdep.h"
	#include "qemu-common.h"
	#include "qemu/datadir.h"
	#include "qapi/error.h"
	#include "qemu/error-report.h"
	#include "ui/console.h"
	#include "hw/sysbus.h"
	#include "migration/vmstate.h"
	#include "hw/irq.h"
	#include "hw/loader.h"
	#include "hw/qdev-properties.h"
	#include "qemu/log.h"
	#include "qemu/module.h"
	#include "trace.h"
	#include "qom/object.h"

	/* Change to 1 to enable debugging */
	#define DEBUG_CG3 0

	#define CG3_ROM_FILE "QEMU,cgthree.bin"
	#define FCODE_MAX_ROM_SIZE 0x10000

	#define CG3_REG_SIZE 0x20

	#define CG3_REG_BT458_ADDR 0x0
	#define CG3_REG_BT458_COLMAP 0x4
	#define CG3_REG_FBC_CTRL 0x10
	#define CG3_REG_FBC_STATUS 0x11
	#define CG3_REG_FBC_CURSTART 0x12
	#define CG3_REG_FBC_CUREND 0x13
	#define CG3_REG_FBC_VCTRL 0x14

	/* Control register flags */
	#define CG3_CR_ENABLE_INTS 0x80

	/* Status register flags */
	#define CG3_SR_PENDING_INT 0x80
	#define CG3_SR_1152_900_76_B 0x60
	#define CG3_SR_ID_COLOR 0x01

	#define CG3_VRAM_SIZE 0x100000
	#define CG3_VRAM_OFFSET 0x800000

	#define TYPE_CG3 "cgthree"
	OBJECT_DECLARE_SIMPLE_TYPE(CG3State, CG3)

	struct CG3State {
	SysBusDevice parent_obj;

	QemuConsole *con;
	qemu_irq irq;
	hwaddr prom_addr;
	MemoryRegion vram_mem;
	MemoryRegion rom;
	MemoryRegion reg;
	uint32_t vram_size;
	int full_update;
	uint8_t regs[16];
	uint8_t r[256], g[256], b[256];
	uint16_t width, height, depth;
	uint8_t dac_index, dac_state;
	};

	static void cg3_update_display(void *opaque)
	{
	CG3State *s = opaque;
	DisplaySurface *surface = qemu_console_surface(s->con);
	const uint8_t *pix;
	uint32_t *data;
	uint32_t dval;
	int x, y, y_start;
	unsigned int width, height;
	ram_addr_t page;
	DirtyBitmapSnapshot *snap = NULL;

	if (surface_bits_per_pixel(surface) != 32) {
	return;
	}
	width = s->width;
	height = s->height;

	y_start = -1;
	pix = memory_region_get_ram_ptr(&s->vram_mem);
	data = (uint32_t *)surface_data(surface);

	if (!s->full_update) {
	snap = memory_region_snapshot_and_clear_dirty(&s->vram_mem, 0x0,
	memory_region_size(&s->vram_mem),
	DIRTY_MEMORY_VGA);
	}

	for (y = 0; y < height; y++) {
	int update;

	page = (ram_addr_t)y * width;

	if (s->full_update) {
	update = 1;
	} else {
	update = memory_region_snapshot_get_dirty(&s->vram_mem, snap, page,
	width);
	}

	if (update) {
	if (y_start < 0) {
	y_start = y;
	}

	for (x = 0; x < width; x++) {
	dval = *pix++;
	dval = (s->r[dval] << 16) \| (s->g[dval] << 8) \| s->b[dval];
	*data++ = dval;
	}
	} else {
	if (y_start >= 0) {
	dpy_gfx_update(s->con, 0, y_start, width, y - y_start);
	y_start = -1;
	}
	pix += width;
	data += width;
	}
	}
	s->full_update = 0;
	if (y_start >= 0) {
	dpy_gfx_update(s->con, 0, y_start, width, y - y_start);
	}
	/* vsync interrupt? */
	if (s->regs[0] & CG3_CR_ENABLE_INTS) {
	s->regs[1] \|= CG3_SR_PENDING_INT;
	qemu_irq_raise(s->irq);
	}
	g_free(snap);
	}

	static void cg3_invalidate_display(void *opaque)
	{
	CG3State *s = opaque;

	memory_region_set_dirty(&s->vram_mem, 0, CG3_VRAM_SIZE);
	}

	static uint64_t cg3_reg_read(void *opaque, hwaddr addr, unsigned size)
	{
	CG3State *s = opaque;
	int val;

	switch (addr) {
	case CG3_REG_BT458_ADDR:
	case CG3_REG_BT458_COLMAP:
	val = 0;
	break;
	case CG3_REG_FBC_CTRL:
	val = s->regs[0];
	break;
	case CG3_REG_FBC_STATUS:
	/* monitor ID 6, board type = 1 (color) */
	val = s->regs[1] \| CG3_SR_1152_900_76_B \| CG3_SR_ID_COLOR;
	break;
	case CG3_REG_FBC_CURSTART ... CG3_REG_SIZE - 1:
	val = s->regs[addr - 0x10];
	break;
	default:
	qemu_log_mask(LOG_UNIMP,
	"cg3: Unimplemented register read "
	"reg 0x%" HWADDR_PRIx " size 0x%x\n",
	addr, size);
	val = 0;
	break;
	}
	trace_cg3_read(addr, val, size);

	return val;
	}

	static void cg3_reg_write(void *opaque, hwaddr addr, uint64_t val,
	unsigned size)
	{
	CG3State *s = opaque;
	uint8_t regval;
	int i;

	trace_cg3_write(addr, val, size);
	switch (addr) {
	case CG3_REG_BT458_ADDR:
	s->dac_index = val;
	s->dac_state = 0;
	break;
	case CG3_REG_BT458_COLMAP:
	/* This register can be written to as either a long word or a byte */
	if (size == 1) {
	val <<= 24;
	}

	for (i = 0; i < size; i++) {
	regval = val >> 24;

	switch (s->dac_state) {
	case 0:
	s->r[s->dac_index] = regval;
	s->dac_state++;
	break;
	case 1:
	s->g[s->dac_index] = regval;
	s->dac_state++;
	break;
	case 2:
	s->b[s->dac_index] = regval;
	/* Index autoincrement */
	s->dac_index = (s->dac_index + 1) & 0xff;
	/* fall through */
	default:
	s->dac_state = 0;
	break;
	}
	val <<= 8;
	}
	s->full_update = 1;
	break;
	case CG3_REG_FBC_CTRL:
	s->regs[0] = val;
	break;
	case CG3_REG_FBC_STATUS:
	if (s->regs[1] & CG3_SR_PENDING_INT) {
	/* clear interrupt */
	s->regs[1] &= ~CG3_SR_PENDING_INT;
	qemu_irq_lower(s->irq);
	}
	break;
	case CG3_REG_FBC_CURSTART ... CG3_REG_SIZE - 1:
	s->regs[addr - 0x10] = val;
	break;
	default:
	qemu_log_mask(LOG_UNIMP,
	"cg3: Unimplemented register write "
	"reg 0x%" HWADDR_PRIx " size 0x%x value 0x%" PRIx64 "\n",
	addr, size, val);
	break;
	}
	}

	static const MemoryRegionOps cg3_reg_ops = {
	.read = cg3_reg_read,
	.write = cg3_reg_write,
	.endianness = DEVICE_NATIVE_ENDIAN,
	.valid = {
	.min_access_size = 1,
	.max_access_size = 4,
	},
	};

	static const GraphicHwOps cg3_ops = {
	.invalidate = cg3_invalidate_display,
	.gfx_update = cg3_update_display,
	};

	static void cg3_initfn(Object *obj)
	{
	SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
	CG3State *s = CG3(obj);

	memory_region_init_rom_nomigrate(&s->rom, obj, "cg3.prom",
	FCODE_MAX_ROM_SIZE, &error_fatal);
	sysbus_init_mmio(sbd, &s->rom);

	memory_region_init_io(&s->reg, obj, &cg3_reg_ops, s, "cg3.reg",
	CG3_REG_SIZE);
	sysbus_init_mmio(sbd, &s->reg);
	}

	static void cg3_realizefn(DeviceState dev, Error *errp)
	{
	SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
	CG3State *s = CG3(dev);
	int ret;
	char *fcode_filename;

	/* FCode ROM */
	vmstate_register_ram_global(&s->rom);
	fcode_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, CG3_ROM_FILE);
	if (fcode_filename) {
	ret = load_image_mr(fcode_filename, &s->rom);
	g_free(fcode_filename);
	if (ret < 0 \|\| ret > FCODE_MAX_ROM_SIZE) {
	warn_report("cg3: could not load prom '%s'", CG3_ROM_FILE);
	}
	}

	memory_region_init_ram(&s->vram_mem, NULL, "cg3.vram", s->vram_size,
	&error_fatal);
	memory_region_set_log(&s->vram_mem, true, DIRTY_MEMORY_VGA);
	sysbus_init_mmio(sbd, &s->vram_mem);

	sysbus_init_irq(sbd, &s->irq);

	s->con = graphic_console_init(dev, 0, &cg3_ops, s);
	qemu_console_resize(s->con, s->width, s->height);
	}

	static int vmstate_cg3_post_load(void *opaque, int version_id)
	{
	CG3State *s = opaque;

	cg3_invalidate_display(s);

	return 0;
	}

	static const VMStateDescription vmstate_cg3 = {
	.name = "cg3",
	.version_id = 1,
	.minimum_version_id = 1,
	.post_load = vmstate_cg3_post_load,
	.fields = (VMStateField[]) {
	VMSTATE_UINT16(height, CG3State),
	VMSTATE_UINT16(width, CG3State),
	VMSTATE_UINT16(depth, CG3State),
	VMSTATE_BUFFER(r, CG3State),
	VMSTATE_BUFFER(g, CG3State),
	VMSTATE_BUFFER(b, CG3State),
	VMSTATE_UINT8(dac_index, CG3State),
	VMSTATE_UINT8(dac_state, CG3State),
	VMSTATE_END_OF_LIST()
	}
	};

	static void cg3_reset(DeviceState *d)
	{
	CG3State *s = CG3(d);

	/* Initialize palette */
	memset(s->r, 0, 256);
	memset(s->g, 0, 256);
	memset(s->b, 0, 256);

	s->dac_state = 0;
	s->full_update = 1;
	qemu_irq_lower(s->irq);
	}

	static Property cg3_properties[] = {
	DEFINE_PROP_UINT32("vram-size", CG3State, vram_size, -1),
	DEFINE_PROP_UINT16("width", CG3State, width, -1),
	DEFINE_PROP_UINT16("height", CG3State, height, -1),
	DEFINE_PROP_UINT16("depth", CG3State, depth, -1),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void cg3_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	dc->realize = cg3_realizefn;
	dc->reset = cg3_reset;
	dc->vmsd = &vmstate_cg3;
	device_class_set_props(dc, cg3_properties);
	}

	static const TypeInfo cg3_info = {
	.name = TYPE_CG3,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(CG3State),
	.instance_init = cg3_initfn,
	.class_init = cg3_class_init,
	};

	static void cg3_register_types(void)
	{
	type_register_static(&cg3_info);
	}

	type_init(cg3_register_types)