new file mode 100644
@@ -0,0 +1,119 @@
+/*
+ * QEMU model of ROM
+ *
+ * Copyright (C) 2012 Faraday Technology
+ * Written by Dante Su <dantesu@faraday-tech.com>
+ *
+ * This file is licensed under GNU GPL v2.
+ */
+
+#include "sysbus.h"
+#include "sysemu/sysemu.h"
+#include "sysemu/blockdev.h"
+
+#define TYPE_ROM "rom"
+
+typedef struct ROMState {
+ SysBusDevice busdev;
+ MemoryRegion mem;
+ MemoryRegion *mem_mappings; /* array; one per mapping */
+ MemoryRegion orig_mem;
+ BlockDriverState *bdrv;
+ uint8_t *storage;
+ uint32_t size;
+} rom_state;
+
+#define ROM(obj) \
+ OBJECT_CHECK(rom_state, obj, TYPE_ROM)
+
+static uint64_t
+rom_mem_read(void *opaque, hwaddr addr, unsigned int size)
+{
+ return 0;
+}
+
+static void
+rom_mem_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
+{
+}
+
+static const MemoryRegionOps rom_ops = {
+ .read = rom_mem_read,
+ .write = rom_mem_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .valid = {
+ .min_access_size = 1,
+ .max_access_size = 8
+ }
+};
+
+static int rom_init(SysBusDevice *dev)
+{
+ rom_state *s = ROM(FROM_SYSBUS(rom_state, dev));
+ DriveInfo *dinfo;
+
+ memory_region_init_rom_device(&s->orig_mem, &rom_ops, s, "rom", s->size);
+ vmstate_register_ram(&s->orig_mem, DEVICE(s));
+ s->storage = memory_region_get_ram_ptr(&s->orig_mem);
+
+ dinfo = drive_get_next(IF_PFLASH);
+ if (dinfo && dinfo->bdrv) {
+ s->bdrv = dinfo->bdrv;
+ /* read the initial flash content */
+ bdrv_read(s->bdrv, 0, s->storage,
+ DIV_ROUND_UP(s->size, BDRV_SECTOR_SIZE));
+ } else {
+ memset(s->storage, 0x00, s->size);
+ }
+
+ memory_region_init(&s->mem, "rom", s->size);
+ s->mem_mappings = g_new(MemoryRegion, 1);
+ memory_region_init_alias(&s->mem_mappings[0],
+ "rom-alias",
+ &s->orig_mem,
+ 0,
+ s->size);
+ memory_region_add_subregion(&s->mem, 0, &s->mem_mappings[0]);
+
+ sysbus_init_mmio(dev, &s->mem);
+ return 0;
+}
+
+static Property rom_properties[] = {
+ DEFINE_PROP_UINT32("size", rom_state, size, 16384),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static const VMStateDescription vmstate_rom = {
+ .name = "rom",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void rom_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+ k->init = rom_init;
+ dc->props = rom_properties;
+ dc->vmsd = &vmstate_rom;
+}
+
+static const TypeInfo rom_info = {
+ .name = TYPE_ROM,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(rom_state),
+ .class_init = rom_class_init,
+};
+
+static void rom_register_types(void)
+{
+ type_register_static(&rom_info);
+}
+
+type_init(rom_register_types)