hw/nvram/fw_cfg.c - qemu - Git at Google

 /*
  * QEMU Firmware configuration device emulation
  *
  * Copyright (c) 2008 Gleb Natapov
  *
  * 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 "hw/hw.h"
 #include "sysemu/sysemu.h"
 #include "hw/isa/isa.h"
 #include "hw/nvram/fw_cfg.h"
 #include "hw/sysbus.h"
 #include "trace.h"
 #include "qemu/error-report.h"
 #include "qemu/config-file.h"

 #define FW_CFG_SIZE 2
 #define FW_CFG_NAME "fw_cfg"
 #define FW_CFG_PATH "/machine/" FW_CFG_NAME

 #define TYPE_FW_CFG     "fw_cfg"
 #define TYPE_FW_CFG_IO  "fw_cfg_io"
 #define TYPE_FW_CFG_MEM "fw_cfg_mem"

 #define FW_CFG(obj)     OBJECT_CHECK(FWCfgState,    (obj), TYPE_FW_CFG)
 #define FW_CFG_IO(obj)  OBJECT_CHECK(FWCfgIoState,  (obj), TYPE_FW_CFG_IO)
 #define FW_CFG_MEM(obj) OBJECT_CHECK(FWCfgMemState, (obj), TYPE_FW_CFG_MEM)

 typedef struct FWCfgEntry {
     uint32_t len;
     uint8_t *data;
     void *callback_opaque;
     FWCfgReadCallback read_callback;
 } FWCfgEntry;

 struct FWCfgState {
     /*< private >*/
     SysBusDevice parent_obj;
     /*< public >*/

     FWCfgEntry entries[2][FW_CFG_MAX_ENTRY];
     FWCfgFiles *files;
     uint16_t cur_entry;
     uint32_t cur_offset;
     Notifier machine_ready;
 };

 struct FWCfgIoState {
     /*< private >*/
     FWCfgState parent_obj;
     /*< public >*/

     MemoryRegion comb_iomem;
     uint32_t iobase;
 };

 struct FWCfgMemState {
     /*< private >*/
     FWCfgState parent_obj;
     /*< public >*/

     MemoryRegion ctl_iomem, data_iomem;
     uint32_t data_width;
     MemoryRegionOps wide_data_ops;
 };

 #define JPG_FILE 0
 #define BMP_FILE 1

 static char *read_splashfile(char *filename, gsize *file_sizep,
                              int *file_typep)
 {
     GError *err = NULL;
     gboolean res;
     gchar *content;
     int file_type;
     unsigned int filehead;
     int bmp_bpp;

     res = g_file_get_contents(filename, &content, file_sizep, &err);
     if (res == FALSE) {
         error_report("failed to read splash file '%s'", filename);
         g_error_free(err);
         return NULL;
     }

     /* check file size */
     if (*file_sizep < 30) {
         goto error;
     }

     /* check magic ID */
     filehead = ((content[0] & 0xff) + (content[1] << 8)) & 0xffff;
     if (filehead == 0xd8ff) {
         file_type = JPG_FILE;
     } else if (filehead == 0x4d42) {
         file_type = BMP_FILE;
     } else {
         goto error;
     }

     /* check BMP bpp */
     if (file_type == BMP_FILE) {
         bmp_bpp = (content[28] + (content[29] << 8)) & 0xffff;
         if (bmp_bpp != 24) {
             goto error;
         }
     }

     /* return values */
     *file_typep = file_type;

     return content;

 error:
     error_report("splash file '%s' format not recognized; must be JPEG "
                  "or 24 bit BMP", filename);
     g_free(content);
     return NULL;
 }

 static void fw_cfg_bootsplash(FWCfgState *s)
 {
     int boot_splash_time = -1;
     const char *boot_splash_filename = NULL;
     char *p;
     char *filename, *file_data;
     gsize file_size;
     int file_type;
     const char *temp;

     /* get user configuration */
     QemuOptsList *plist = qemu_find_opts("boot-opts");
     QemuOpts *opts = QTAILQ_FIRST(&plist->head);
     if (opts != NULL) {
         temp = qemu_opt_get(opts, "splash");
         if (temp != NULL) {
             boot_splash_filename = temp;
         }
         temp = qemu_opt_get(opts, "splash-time");
         if (temp != NULL) {
             p = (char *)temp;
             boot_splash_time = strtol(p, (char **)&p, 10);
         }
     }

     /* insert splash time if user configurated */
     if (boot_splash_time >= 0) {
         /* validate the input */
         if (boot_splash_time > 0xffff) {
             error_report("splash time is big than 65535, force it to 65535.");
             boot_splash_time = 0xffff;
         }
         /* use little endian format */
         qemu_extra_params_fw[0] = (uint8_t)(boot_splash_time & 0xff);
         qemu_extra_params_fw[1] = (uint8_t)((boot_splash_time >> 8) & 0xff);
         fw_cfg_add_file(s, "etc/boot-menu-wait", qemu_extra_params_fw, 2);
     }

     /* insert splash file if user configurated */
     if (boot_splash_filename != NULL) {
         filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, boot_splash_filename);
         if (filename == NULL) {
             error_report("failed to find file '%s'.", boot_splash_filename);
             return;
         }

         /* loading file data */
         file_data = read_splashfile(filename, &file_size, &file_type);
         if (file_data == NULL) {
             g_free(filename);
             return;
         }
         g_free(boot_splash_filedata);
         boot_splash_filedata = (uint8_t *)file_data;
         boot_splash_filedata_size = file_size;

         /* insert data */
         if (file_type == JPG_FILE) {
             fw_cfg_add_file(s, "bootsplash.jpg",
                     boot_splash_filedata, boot_splash_filedata_size);
         } else {
             fw_cfg_add_file(s, "bootsplash.bmp",
                     boot_splash_filedata, boot_splash_filedata_size);
         }
         g_free(filename);
     }
 }

 static void fw_cfg_reboot(FWCfgState *s)
 {
     int reboot_timeout = -1;
     char *p;
     const char *temp;

     /* get user configuration */
     QemuOptsList *plist = qemu_find_opts("boot-opts");
     QemuOpts *opts = QTAILQ_FIRST(&plist->head);
     if (opts != NULL) {
         temp = qemu_opt_get(opts, "reboot-timeout");
         if (temp != NULL) {
             p = (char *)temp;
             reboot_timeout = strtol(p, (char **)&p, 10);
         }
     }
     /* validate the input */
     if (reboot_timeout > 0xffff) {
         error_report("reboot timeout is larger than 65535, force it to 65535.");
         reboot_timeout = 0xffff;
     }
     fw_cfg_add_file(s, "etc/boot-fail-wait", g_memdup(&reboot_timeout, 4), 4);
 }

 static void fw_cfg_write(FWCfgState *s, uint8_t value)
 {
     /* nothing, write support removed in QEMU v2.4+ */
 }

 static int fw_cfg_select(FWCfgState *s, uint16_t key)
 {
     int ret;

     s->cur_offset = 0;
     if ((key & FW_CFG_ENTRY_MASK) >= FW_CFG_MAX_ENTRY) {
         s->cur_entry = FW_CFG_INVALID;
         ret = 0;
     } else {
         s->cur_entry = key;
         ret = 1;
     }

     trace_fw_cfg_select(s, key, ret);
     return ret;
 }

 static uint8_t fw_cfg_read(FWCfgState *s)
 {
     int arch = !!(s->cur_entry & FW_CFG_ARCH_LOCAL);
     FWCfgEntry *e = &s->entries[arch][s->cur_entry & FW_CFG_ENTRY_MASK];
     uint8_t ret;

     if (s->cur_entry == FW_CFG_INVALID || !e->data || s->cur_offset >= e->len)
         ret = 0;
     else {
         if (e->read_callback) {
             e->read_callback(e->callback_opaque, s->cur_offset);
         }
         ret = e->data[s->cur_offset++];
     }

     trace_fw_cfg_read(s, ret);
     return ret;
 }

 static uint64_t fw_cfg_data_mem_read(void *opaque, hwaddr addr,
                                      unsigned size)
 {
     FWCfgState *s = opaque;
     uint64_t value = 0;
     unsigned i;

     for (i = 0; i < size; ++i) {
         value = (value << 8) | fw_cfg_read(s);
     }
     return value;
 }

 static void fw_cfg_data_mem_write(void *opaque, hwaddr addr,
                                   uint64_t value, unsigned size)
 {
     FWCfgState *s = opaque;
     unsigned i = size;

     do {
         fw_cfg_write(s, value >> (8 * --i));
     } while (i);
 }

 static bool fw_cfg_data_mem_valid(void *opaque, hwaddr addr,
                                   unsigned size, bool is_write)
 {
     return addr == 0;
 }

 static void fw_cfg_ctl_mem_write(void *opaque, hwaddr addr,
                                  uint64_t value, unsigned size)
 {
     fw_cfg_select(opaque, (uint16_t)value);
 }

 static bool fw_cfg_ctl_mem_valid(void *opaque, hwaddr addr,
                                  unsigned size, bool is_write)
 {
     return is_write && size == 2;
 }

 static uint64_t fw_cfg_comb_read(void *opaque, hwaddr addr,
                                  unsigned size)
 {
     return fw_cfg_read(opaque);
 }

 static void fw_cfg_comb_write(void *opaque, hwaddr addr,
                               uint64_t value, unsigned size)
 {
     switch (size) {
     case 1:
         fw_cfg_write(opaque, (uint8_t)value);
         break;
     case 2:
         fw_cfg_select(opaque, (uint16_t)value);
         break;
     }
 }

 static bool fw_cfg_comb_valid(void *opaque, hwaddr addr,
                                   unsigned size, bool is_write)
 {
     return (size == 1) || (is_write && size == 2);
 }

 static const MemoryRegionOps fw_cfg_ctl_mem_ops = {
     .write = fw_cfg_ctl_mem_write,
     .endianness = DEVICE_BIG_ENDIAN,
     .valid.accepts = fw_cfg_ctl_mem_valid,
 };

 static const MemoryRegionOps fw_cfg_data_mem_ops = {
     .read = fw_cfg_data_mem_read,
     .write = fw_cfg_data_mem_write,
     .endianness = DEVICE_BIG_ENDIAN,
     .valid = {
         .min_access_size = 1,
         .max_access_size = 1,
         .accepts = fw_cfg_data_mem_valid,
     },
 };

 static const MemoryRegionOps fw_cfg_comb_mem_ops = {
     .read = fw_cfg_comb_read,
     .write = fw_cfg_comb_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
     .valid.accepts = fw_cfg_comb_valid,
 };

 static void fw_cfg_reset(DeviceState *d)
 {
     FWCfgState *s = FW_CFG(d);

     fw_cfg_select(s, 0);
 }

 /* Save restore 32 bit int as uint16_t
    This is a Big hack, but it is how the old state did it.
    Or we broke compatibility in the state, or we can't use struct tm
  */

 static int get_uint32_as_uint16(QEMUFile *f, void *pv, size_t size)
 {
     uint32_t *v = pv;
     *v = qemu_get_be16(f);
     return 0;
 }

 static void put_unused(QEMUFile *f, void *pv, size_t size)
 {
     fprintf(stderr, "uint32_as_uint16 is only used for backward compatibility.\n");
     fprintf(stderr, "This functions shouldn't be called.\n");
 }

 static const VMStateInfo vmstate_hack_uint32_as_uint16 = {
     .name = "int32_as_uint16",
     .get  = get_uint32_as_uint16,
     .put  = put_unused,
 };

 #define VMSTATE_UINT16_HACK(_f, _s, _t)                                    \
     VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_hack_uint32_as_uint16, uint32_t)


 static bool is_version_1(void *opaque, int version_id)
 {
     return version_id == 1;
 }

 static const VMStateDescription vmstate_fw_cfg = {
     .name = "fw_cfg",
     .version_id = 2,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
         VMSTATE_UINT16(cur_entry, FWCfgState),
         VMSTATE_UINT16_HACK(cur_offset, FWCfgState, is_version_1),
         VMSTATE_UINT32_V(cur_offset, FWCfgState, 2),
         VMSTATE_END_OF_LIST()
     }
 };

 static void fw_cfg_add_bytes_read_callback(FWCfgState *s, uint16_t key,
                                            FWCfgReadCallback callback,
                                            void *callback_opaque,
                                            void *data, size_t len)
 {
     int arch = !!(key & FW_CFG_ARCH_LOCAL);

     key &= FW_CFG_ENTRY_MASK;

     assert(key < FW_CFG_MAX_ENTRY && len < UINT32_MAX);
     assert(s->entries[arch][key].data == NULL); /* avoid key conflict */

     s->entries[arch][key].data = data;
     s->entries[arch][key].len = (uint32_t)len;
     s->entries[arch][key].read_callback = callback;
     s->entries[arch][key].callback_opaque = callback_opaque;
 }

 static void *fw_cfg_modify_bytes_read(FWCfgState *s, uint16_t key,
                                               void *data, size_t len)
 {
     void *ptr;
     int arch = !!(key & FW_CFG_ARCH_LOCAL);

     key &= FW_CFG_ENTRY_MASK;

     assert(key < FW_CFG_MAX_ENTRY && len < UINT32_MAX);

     /* return the old data to the function caller, avoid memory leak */
     ptr = s->entries[arch][key].data;
     s->entries[arch][key].data = data;
     s->entries[arch][key].len = len;
     s->entries[arch][key].callback_opaque = NULL;

     return ptr;
 }

 void fw_cfg_add_bytes(FWCfgState *s, uint16_t key, void *data, size_t len)
 {
     fw_cfg_add_bytes_read_callback(s, key, NULL, NULL, data, len);
 }

 void fw_cfg_add_string(FWCfgState *s, uint16_t key, const char *value)
 {
     size_t sz = strlen(value) + 1;

     fw_cfg_add_bytes(s, key, g_memdup(value, sz), sz);
 }

 void fw_cfg_add_i16(FWCfgState *s, uint16_t key, uint16_t value)
 {
     uint16_t *copy;

     copy = g_malloc(sizeof(value));
     *copy = cpu_to_le16(value);
     fw_cfg_add_bytes(s, key, copy, sizeof(value));
 }

 void fw_cfg_modify_i16(FWCfgState *s, uint16_t key, uint16_t value)
 {
     uint16_t *copy, *old;

     copy = g_malloc(sizeof(value));
     *copy = cpu_to_le16(value);
     old = fw_cfg_modify_bytes_read(s, key, copy, sizeof(value));
     g_free(old);
 }

 void fw_cfg_add_i32(FWCfgState *s, uint16_t key, uint32_t value)
 {
     uint32_t *copy;

     copy = g_malloc(sizeof(value));
     *copy = cpu_to_le32(value);
     fw_cfg_add_bytes(s, key, copy, sizeof(value));
 }

 void fw_cfg_add_i64(FWCfgState *s, uint16_t key, uint64_t value)
 {
     uint64_t *copy;

     copy = g_malloc(sizeof(value));
     *copy = cpu_to_le64(value);
     fw_cfg_add_bytes(s, key, copy, sizeof(value));
 }

 void fw_cfg_add_file_callback(FWCfgState *s,  const char *filename,
                               FWCfgReadCallback callback, void *callback_opaque,
                               void *data, size_t len)
 {
     int i, index;
     size_t dsize;

     if (!s->files) {
         dsize = sizeof(uint32_t) + sizeof(FWCfgFile) * FW_CFG_FILE_SLOTS;
         s->files = g_malloc0(dsize);
         fw_cfg_add_bytes(s, FW_CFG_FILE_DIR, s->files, dsize);
     }

     index = be32_to_cpu(s->files->count);
     assert(index < FW_CFG_FILE_SLOTS);

     pstrcpy(s->files->f[index].name, sizeof(s->files->f[index].name),
             filename);
     for (i = 0; i < index; i++) {
         if (strcmp(s->files->f[index].name, s->files->f[i].name) == 0) {
             error_report("duplicate fw_cfg file name: %s",
                          s->files->f[index].name);
             exit(1);
         }
     }

     fw_cfg_add_bytes_read_callback(s, FW_CFG_FILE_FIRST + index,
                                    callback, callback_opaque, data, len);

     s->files->f[index].size   = cpu_to_be32(len);
     s->files->f[index].select = cpu_to_be16(FW_CFG_FILE_FIRST + index);
     trace_fw_cfg_add_file(s, index, s->files->f[index].name, len);

     s->files->count = cpu_to_be32(index+1);
 }

 void fw_cfg_add_file(FWCfgState *s,  const char *filename,
                      void *data, size_t len)
 {
     fw_cfg_add_file_callback(s, filename, NULL, NULL, data, len);
 }

 void *fw_cfg_modify_file(FWCfgState *s, const char *filename,
                         void *data, size_t len)
 {
     int i, index;
     void *ptr = NULL;

     assert(s->files);

     index = be32_to_cpu(s->files->count);
     assert(index < FW_CFG_FILE_SLOTS);

     for (i = 0; i < index; i++) {
         if (strcmp(filename, s->files->f[i].name) == 0) {
             ptr = fw_cfg_modify_bytes_read(s, FW_CFG_FILE_FIRST + i,
                                            data, len);
             s->files->f[i].size   = cpu_to_be32(len);
             return ptr;
         }
     }
     /* add new one */
     fw_cfg_add_file_callback(s, filename, NULL, NULL, data, len);
     return NULL;
 }

 static void fw_cfg_machine_reset(void *opaque)
 {
     void *ptr;
     size_t len;
     FWCfgState *s = opaque;
     char *bootindex = get_boot_devices_list(&len, false);

     ptr = fw_cfg_modify_file(s, "bootorder", (uint8_t *)bootindex, len);
     g_free(ptr);
 }

 static void fw_cfg_machine_ready(struct Notifier *n, void *data)
 {
     FWCfgState *s = container_of(n, FWCfgState, machine_ready);
     qemu_register_reset(fw_cfg_machine_reset, s);
 }


 static void fw_cfg_init1(DeviceState *dev)
 {
     FWCfgState *s = FW_CFG(dev);

     assert(!object_resolve_path(FW_CFG_PATH, NULL));

     object_property_add_child(qdev_get_machine(), FW_CFG_NAME, OBJECT(s), NULL);

     qdev_init_nofail(dev);

     fw_cfg_add_bytes(s, FW_CFG_SIGNATURE, (char *)"QEMU", 4);
     fw_cfg_add_i32(s, FW_CFG_ID, 1);
     fw_cfg_add_bytes(s, FW_CFG_UUID, qemu_uuid, 16);
     fw_cfg_add_i16(s, FW_CFG_NOGRAPHIC, (uint16_t)(display_type == DT_NOGRAPHIC));
     fw_cfg_add_i16(s, FW_CFG_NB_CPUS, (uint16_t)smp_cpus);
     fw_cfg_add_i16(s, FW_CFG_BOOT_MENU, (uint16_t)boot_menu);
     fw_cfg_bootsplash(s);
     fw_cfg_reboot(s);

     s->machine_ready.notify = fw_cfg_machine_ready;
     qemu_add_machine_init_done_notifier(&s->machine_ready);
 }

 FWCfgState *fw_cfg_init_io(uint32_t iobase)
 {
     DeviceState *dev;

     dev = qdev_create(NULL, TYPE_FW_CFG_IO);
     qdev_prop_set_uint32(dev, "iobase", iobase);
     fw_cfg_init1(dev);

     return FW_CFG(dev);
 }

 FWCfgState *fw_cfg_init_mem_wide(hwaddr ctl_addr, hwaddr data_addr,
                                  uint32_t data_width)
 {
     DeviceState *dev;
     SysBusDevice *sbd;

     dev = qdev_create(NULL, TYPE_FW_CFG_MEM);
     qdev_prop_set_uint32(dev, "data_width", data_width);

     fw_cfg_init1(dev);

     sbd = SYS_BUS_DEVICE(dev);
     sysbus_mmio_map(sbd, 0, ctl_addr);
     sysbus_mmio_map(sbd, 1, data_addr);

     return FW_CFG(dev);
 }

 FWCfgState *fw_cfg_init_mem(hwaddr ctl_addr, hwaddr data_addr)
 {
     return fw_cfg_init_mem_wide(ctl_addr, data_addr,
                                 fw_cfg_data_mem_ops.valid.max_access_size);
 }


 FWCfgState *fw_cfg_find(void)
 {
     return FW_CFG(object_resolve_path(FW_CFG_PATH, NULL));
 }

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

     dc->reset = fw_cfg_reset;
     dc->vmsd = &vmstate_fw_cfg;
 }

 static const TypeInfo fw_cfg_info = {
     .name          = TYPE_FW_CFG,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(FWCfgState),
     .class_init    = fw_cfg_class_init,
 };


 static Property fw_cfg_io_properties[] = {
     DEFINE_PROP_UINT32("iobase", FWCfgIoState, iobase, -1),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void fw_cfg_io_realize(DeviceState *dev, Error **errp)
 {
     FWCfgIoState *s = FW_CFG_IO(dev);
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);

     memory_region_init_io(&s->comb_iomem, OBJECT(s), &fw_cfg_comb_mem_ops,
                           FW_CFG(s), "fwcfg", FW_CFG_SIZE);
     sysbus_add_io(sbd, s->iobase, &s->comb_iomem);
 }

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

     dc->realize = fw_cfg_io_realize;
     dc->props = fw_cfg_io_properties;
 }

 static const TypeInfo fw_cfg_io_info = {
     .name          = TYPE_FW_CFG_IO,
     .parent        = TYPE_FW_CFG,
     .instance_size = sizeof(FWCfgIoState),
     .class_init    = fw_cfg_io_class_init,
 };


 static Property fw_cfg_mem_properties[] = {
     DEFINE_PROP_UINT32("data_width", FWCfgMemState, data_width, -1),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void fw_cfg_mem_realize(DeviceState *dev, Error **errp)
 {
     FWCfgMemState *s = FW_CFG_MEM(dev);
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
     const MemoryRegionOps *data_ops = &fw_cfg_data_mem_ops;

     memory_region_init_io(&s->ctl_iomem, OBJECT(s), &fw_cfg_ctl_mem_ops,
                           FW_CFG(s), "fwcfg.ctl", FW_CFG_SIZE);
     sysbus_init_mmio(sbd, &s->ctl_iomem);

     if (s->data_width > data_ops->valid.max_access_size) {
         /* memberwise copy because the "old_mmio" member is const */
         s->wide_data_ops.read       = data_ops->read;
         s->wide_data_ops.write      = data_ops->write;
         s->wide_data_ops.endianness = data_ops->endianness;
         s->wide_data_ops.valid      = data_ops->valid;
         s->wide_data_ops.impl       = data_ops->impl;

         s->wide_data_ops.valid.max_access_size = s->data_width;
         s->wide_data_ops.impl.max_access_size  = s->data_width;
         data_ops = &s->wide_data_ops;
     }
     memory_region_init_io(&s->data_iomem, OBJECT(s), data_ops, FW_CFG(s),
                           "fwcfg.data", data_ops->valid.max_access_size);
     sysbus_init_mmio(sbd, &s->data_iomem);
 }

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

     dc->realize = fw_cfg_mem_realize;
     dc->props = fw_cfg_mem_properties;
 }

 static const TypeInfo fw_cfg_mem_info = {
     .name          = TYPE_FW_CFG_MEM,
     .parent        = TYPE_FW_CFG,
     .instance_size = sizeof(FWCfgMemState),
     .class_init    = fw_cfg_mem_class_init,
 };


 static void fw_cfg_register_types(void)
 {
     type_register_static(&fw_cfg_info);
     type_register_static(&fw_cfg_io_info);
     type_register_static(&fw_cfg_mem_info);
 }

 type_init(fw_cfg_register_types)
	/*
	* QEMU Firmware configuration device emulation
	*
	* Copyright (c) 2008 Gleb Natapov
	*
	* 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 "hw/hw.h"
	#include "sysemu/sysemu.h"
	#include "hw/isa/isa.h"
	#include "hw/nvram/fw_cfg.h"
	#include "hw/sysbus.h"
	#include "trace.h"
	#include "qemu/error-report.h"
	#include "qemu/config-file.h"

	#define FW_CFG_SIZE 2
	#define FW_CFG_NAME "fw_cfg"
	#define FW_CFG_PATH "/machine/" FW_CFG_NAME

	#define TYPE_FW_CFG "fw_cfg"
	#define TYPE_FW_CFG_IO "fw_cfg_io"
	#define TYPE_FW_CFG_MEM "fw_cfg_mem"

	#define FW_CFG(obj) OBJECT_CHECK(FWCfgState, (obj), TYPE_FW_CFG)
	#define FW_CFG_IO(obj) OBJECT_CHECK(FWCfgIoState, (obj), TYPE_FW_CFG_IO)
	#define FW_CFG_MEM(obj) OBJECT_CHECK(FWCfgMemState, (obj), TYPE_FW_CFG_MEM)

	typedef struct FWCfgEntry {
	uint32_t len;
	uint8_t *data;
	void *callback_opaque;
	FWCfgReadCallback read_callback;
	} FWCfgEntry;

	struct FWCfgState {
	/< private >/
	SysBusDevice parent_obj;
	/< public >/

	FWCfgEntry entries[2][FW_CFG_MAX_ENTRY];
	FWCfgFiles *files;
	uint16_t cur_entry;
	uint32_t cur_offset;
	Notifier machine_ready;
	};

	struct FWCfgIoState {
	/< private >/
	FWCfgState parent_obj;
	/< public >/

	MemoryRegion comb_iomem;
	uint32_t iobase;
	};

	struct FWCfgMemState {
	/< private >/
	FWCfgState parent_obj;
	/< public >/

	MemoryRegion ctl_iomem, data_iomem;
	uint32_t data_width;
	MemoryRegionOps wide_data_ops;
	};

	#define JPG_FILE 0
	#define BMP_FILE 1

	static char read_splashfile(char filename, gsize *file_sizep,
	int *file_typep)
	{
	GError *err = NULL;
	gboolean res;
	gchar *content;
	int file_type;
	unsigned int filehead;
	int bmp_bpp;

	res = g_file_get_contents(filename, &content, file_sizep, &err);
	if (res == FALSE) {
	error_report("failed to read splash file '%s'", filename);
	g_error_free(err);
	return NULL;
	}

	/* check file size */
	if (*file_sizep < 30) {
	goto error;
	}

	/* check magic ID */
	filehead = ((content[0] & 0xff) + (content[1] << 8)) & 0xffff;
	if (filehead == 0xd8ff) {
	file_type = JPG_FILE;
	} else if (filehead == 0x4d42) {
	file_type = BMP_FILE;
	} else {
	goto error;
	}

	/* check BMP bpp */
	if (file_type == BMP_FILE) {
	bmp_bpp = (content[28] + (content[29] << 8)) & 0xffff;
	if (bmp_bpp != 24) {
	goto error;
	}
	}

	/* return values */
	*file_typep = file_type;

	return content;

	error:
	error_report("splash file '%s' format not recognized; must be JPEG "
	"or 24 bit BMP", filename);
	g_free(content);
	return NULL;
	}

	static void fw_cfg_bootsplash(FWCfgState *s)
	{
	int boot_splash_time = -1;
	const char *boot_splash_filename = NULL;
	char *p;
	char filename, file_data;
	gsize file_size;
	int file_type;
	const char *temp;

	/* get user configuration */
	QemuOptsList *plist = qemu_find_opts("boot-opts");
	QemuOpts *opts = QTAILQ_FIRST(&plist->head);
	if (opts != NULL) {
	temp = qemu_opt_get(opts, "splash");
	if (temp != NULL) {
	boot_splash_filename = temp;
	}
	temp = qemu_opt_get(opts, "splash-time");
	if (temp != NULL) {
	p = (char *)temp;
	boot_splash_time = strtol(p, (char **)&p, 10);
	}
	}

	/* insert splash time if user configurated */
	if (boot_splash_time >= 0) {
	/* validate the input */
	if (boot_splash_time > 0xffff) {
	error_report("splash time is big than 65535, force it to 65535.");
	boot_splash_time = 0xffff;
	}
	/* use little endian format */
	qemu_extra_params_fw[0] = (uint8_t)(boot_splash_time & 0xff);
	qemu_extra_params_fw[1] = (uint8_t)((boot_splash_time >> 8) & 0xff);
	fw_cfg_add_file(s, "etc/boot-menu-wait", qemu_extra_params_fw, 2);
	}

	/* insert splash file if user configurated */
	if (boot_splash_filename != NULL) {
	filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, boot_splash_filename);
	if (filename == NULL) {
	error_report("failed to find file '%s'.", boot_splash_filename);
	return;
	}

	/* loading file data */
	file_data = read_splashfile(filename, &file_size, &file_type);
	if (file_data == NULL) {
	g_free(filename);
	return;
	}
	g_free(boot_splash_filedata);
	boot_splash_filedata = (uint8_t *)file_data;
	boot_splash_filedata_size = file_size;

	/* insert data */
	if (file_type == JPG_FILE) {
	fw_cfg_add_file(s, "bootsplash.jpg",
	boot_splash_filedata, boot_splash_filedata_size);
	} else {
	fw_cfg_add_file(s, "bootsplash.bmp",
	boot_splash_filedata, boot_splash_filedata_size);
	}
	g_free(filename);
	}
	}

	static void fw_cfg_reboot(FWCfgState *s)
	{
	int reboot_timeout = -1;
	char *p;
	const char *temp;

	/* get user configuration */
	QemuOptsList *plist = qemu_find_opts("boot-opts");
	QemuOpts *opts = QTAILQ_FIRST(&plist->head);
	if (opts != NULL) {
	temp = qemu_opt_get(opts, "reboot-timeout");
	if (temp != NULL) {
	p = (char *)temp;
	reboot_timeout = strtol(p, (char **)&p, 10);
	}
	}
	/* validate the input */
	if (reboot_timeout > 0xffff) {
	error_report("reboot timeout is larger than 65535, force it to 65535.");
	reboot_timeout = 0xffff;
	}
	fw_cfg_add_file(s, "etc/boot-fail-wait", g_memdup(&reboot_timeout, 4), 4);
	}

	static void fw_cfg_write(FWCfgState *s, uint8_t value)
	{
	/* nothing, write support removed in QEMU v2.4+ */
	}

	static int fw_cfg_select(FWCfgState *s, uint16_t key)
	{
	int ret;

	s->cur_offset = 0;
	if ((key & FW_CFG_ENTRY_MASK) >= FW_CFG_MAX_ENTRY) {
	s->cur_entry = FW_CFG_INVALID;
	ret = 0;
	} else {
	s->cur_entry = key;
	ret = 1;
	}

	trace_fw_cfg_select(s, key, ret);
	return ret;
	}

	static uint8_t fw_cfg_read(FWCfgState *s)
	{
	int arch = !!(s->cur_entry & FW_CFG_ARCH_LOCAL);
	FWCfgEntry *e = &s->entries[arch][s->cur_entry & FW_CFG_ENTRY_MASK];
	uint8_t ret;

	if (s->cur_entry == FW_CFG_INVALID \|\| !e->data \|\| s->cur_offset >= e->len)
	ret = 0;
	else {
	if (e->read_callback) {
	e->read_callback(e->callback_opaque, s->cur_offset);
	}
	ret = e->data[s->cur_offset++];
	}

	trace_fw_cfg_read(s, ret);
	return ret;
	}

	static uint64_t fw_cfg_data_mem_read(void *opaque, hwaddr addr,
	unsigned size)
	{
	FWCfgState *s = opaque;
	uint64_t value = 0;
	unsigned i;

	for (i = 0; i < size; ++i) {
	value = (value << 8) \| fw_cfg_read(s);
	}
	return value;
	}

	static void fw_cfg_data_mem_write(void *opaque, hwaddr addr,
	uint64_t value, unsigned size)
	{
	FWCfgState *s = opaque;
	unsigned i = size;

	do {
	fw_cfg_write(s, value >> (8 * --i));
	} while (i);
	}

	static bool fw_cfg_data_mem_valid(void *opaque, hwaddr addr,
	unsigned size, bool is_write)
	{
	return addr == 0;
	}

	static void fw_cfg_ctl_mem_write(void *opaque, hwaddr addr,
	uint64_t value, unsigned size)
	{
	fw_cfg_select(opaque, (uint16_t)value);
	}

	static bool fw_cfg_ctl_mem_valid(void *opaque, hwaddr addr,
	unsigned size, bool is_write)
	{
	return is_write && size == 2;
	}

	static uint64_t fw_cfg_comb_read(void *opaque, hwaddr addr,
	unsigned size)
	{
	return fw_cfg_read(opaque);
	}

	static void fw_cfg_comb_write(void *opaque, hwaddr addr,
	uint64_t value, unsigned size)
	{
	switch (size) {
	case 1:
	fw_cfg_write(opaque, (uint8_t)value);
	break;
	case 2:
	fw_cfg_select(opaque, (uint16_t)value);
	break;
	}
	}

	static bool fw_cfg_comb_valid(void *opaque, hwaddr addr,
	unsigned size, bool is_write)
	{
	return (size == 1) \|\| (is_write && size == 2);
	}

	static const MemoryRegionOps fw_cfg_ctl_mem_ops = {
	.write = fw_cfg_ctl_mem_write,
	.endianness = DEVICE_BIG_ENDIAN,
	.valid.accepts = fw_cfg_ctl_mem_valid,
	};

	static const MemoryRegionOps fw_cfg_data_mem_ops = {
	.read = fw_cfg_data_mem_read,
	.write = fw_cfg_data_mem_write,
	.endianness = DEVICE_BIG_ENDIAN,
	.valid = {
	.min_access_size = 1,
	.max_access_size = 1,
	.accepts = fw_cfg_data_mem_valid,
	},
	};

	static const MemoryRegionOps fw_cfg_comb_mem_ops = {
	.read = fw_cfg_comb_read,
	.write = fw_cfg_comb_write,
	.endianness = DEVICE_LITTLE_ENDIAN,
	.valid.accepts = fw_cfg_comb_valid,
	};

	static void fw_cfg_reset(DeviceState *d)
	{
	FWCfgState *s = FW_CFG(d);

	fw_cfg_select(s, 0);
	}

	/* Save restore 32 bit int as uint16_t
	This is a Big hack, but it is how the old state did it.
	Or we broke compatibility in the state, or we can't use struct tm
	*/

	static int get_uint32_as_uint16(QEMUFile f, void pv, size_t size)
	{
	uint32_t *v = pv;
	*v = qemu_get_be16(f);
	return 0;
	}

	static void put_unused(QEMUFile f, void pv, size_t size)
	{
	fprintf(stderr, "uint32_as_uint16 is only used for backward compatibility.\n");
	fprintf(stderr, "This functions shouldn't be called.\n");
	}

	static const VMStateInfo vmstate_hack_uint32_as_uint16 = {
	.name = "int32_as_uint16",
	.get = get_uint32_as_uint16,
	.put = put_unused,
	};

	#define VMSTATE_UINT16_HACK(_f, _s, _t) \
	VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_hack_uint32_as_uint16, uint32_t)


	static bool is_version_1(void *opaque, int version_id)
	{
	return version_id == 1;
	}

	static const VMStateDescription vmstate_fw_cfg = {
	.name = "fw_cfg",
	.version_id = 2,
	.minimum_version_id = 1,
	.fields = (VMStateField[]) {
	VMSTATE_UINT16(cur_entry, FWCfgState),
	VMSTATE_UINT16_HACK(cur_offset, FWCfgState, is_version_1),
	VMSTATE_UINT32_V(cur_offset, FWCfgState, 2),
	VMSTATE_END_OF_LIST()
	}
	};

	static void fw_cfg_add_bytes_read_callback(FWCfgState *s, uint16_t key,
	FWCfgReadCallback callback,
	void *callback_opaque,
	void *data, size_t len)
	{
	int arch = !!(key & FW_CFG_ARCH_LOCAL);

	key &= FW_CFG_ENTRY_MASK;

	assert(key < FW_CFG_MAX_ENTRY && len < UINT32_MAX);
	assert(s->entries[arch][key].data == NULL); /* avoid key conflict */

	s->entries[arch][key].data = data;
	s->entries[arch][key].len = (uint32_t)len;
	s->entries[arch][key].read_callback = callback;
	s->entries[arch][key].callback_opaque = callback_opaque;
	}

	static void fw_cfg_modify_bytes_read(FWCfgState s, uint16_t key,
	void *data, size_t len)
	{
	void *ptr;
	int arch = !!(key & FW_CFG_ARCH_LOCAL);

	key &= FW_CFG_ENTRY_MASK;

	assert(key < FW_CFG_MAX_ENTRY && len < UINT32_MAX);

	/* return the old data to the function caller, avoid memory leak */
	ptr = s->entries[arch][key].data;
	s->entries[arch][key].data = data;
	s->entries[arch][key].len = len;
	s->entries[arch][key].callback_opaque = NULL;

	return ptr;
	}

	void fw_cfg_add_bytes(FWCfgState s, uint16_t key, void data, size_t len)
	{
	fw_cfg_add_bytes_read_callback(s, key, NULL, NULL, data, len);
	}

	void fw_cfg_add_string(FWCfgState s, uint16_t key, const char value)
	{
	size_t sz = strlen(value) + 1;

	fw_cfg_add_bytes(s, key, g_memdup(value, sz), sz);
	}

	void fw_cfg_add_i16(FWCfgState *s, uint16_t key, uint16_t value)
	{
	uint16_t *copy;

	copy = g_malloc(sizeof(value));
	*copy = cpu_to_le16(value);
	fw_cfg_add_bytes(s, key, copy, sizeof(value));
	}

	void fw_cfg_modify_i16(FWCfgState *s, uint16_t key, uint16_t value)
	{
	uint16_t copy, old;

	copy = g_malloc(sizeof(value));
	*copy = cpu_to_le16(value);
	old = fw_cfg_modify_bytes_read(s, key, copy, sizeof(value));
	g_free(old);
	}

	void fw_cfg_add_i32(FWCfgState *s, uint16_t key, uint32_t value)
	{
	uint32_t *copy;

	copy = g_malloc(sizeof(value));
	*copy = cpu_to_le32(value);
	fw_cfg_add_bytes(s, key, copy, sizeof(value));
	}

	void fw_cfg_add_i64(FWCfgState *s, uint16_t key, uint64_t value)
	{
	uint64_t *copy;

	copy = g_malloc(sizeof(value));
	*copy = cpu_to_le64(value);
	fw_cfg_add_bytes(s, key, copy, sizeof(value));
	}

	void fw_cfg_add_file_callback(FWCfgState s, const char filename,
	FWCfgReadCallback callback, void *callback_opaque,
	void *data, size_t len)
	{
	int i, index;
	size_t dsize;

	if (!s->files) {
	dsize = sizeof(uint32_t) + sizeof(FWCfgFile) * FW_CFG_FILE_SLOTS;
	s->files = g_malloc0(dsize);
	fw_cfg_add_bytes(s, FW_CFG_FILE_DIR, s->files, dsize);
	}

	index = be32_to_cpu(s->files->count);
	assert(index < FW_CFG_FILE_SLOTS);

	pstrcpy(s->files->f[index].name, sizeof(s->files->f[index].name),
	filename);
	for (i = 0; i < index; i++) {
	if (strcmp(s->files->f[index].name, s->files->f[i].name) == 0) {
	error_report("duplicate fw_cfg file name: %s",
	s->files->f[index].name);
	exit(1);
	}
	}

	fw_cfg_add_bytes_read_callback(s, FW_CFG_FILE_FIRST + index,
	callback, callback_opaque, data, len);

	s->files->f[index].size = cpu_to_be32(len);
	s->files->f[index].select = cpu_to_be16(FW_CFG_FILE_FIRST + index);
	trace_fw_cfg_add_file(s, index, s->files->f[index].name, len);

	s->files->count = cpu_to_be32(index+1);
	}

	void fw_cfg_add_file(FWCfgState s, const char filename,
	void *data, size_t len)
	{
	fw_cfg_add_file_callback(s, filename, NULL, NULL, data, len);
	}

	void fw_cfg_modify_file(FWCfgState s, const char *filename,
	void *data, size_t len)
	{
	int i, index;
	void *ptr = NULL;

	assert(s->files);

	index = be32_to_cpu(s->files->count);
	assert(index < FW_CFG_FILE_SLOTS);

	for (i = 0; i < index; i++) {
	if (strcmp(filename, s->files->f[i].name) == 0) {
	ptr = fw_cfg_modify_bytes_read(s, FW_CFG_FILE_FIRST + i,
	data, len);
	s->files->f[i].size = cpu_to_be32(len);
	return ptr;
	}
	}
	/* add new one */
	fw_cfg_add_file_callback(s, filename, NULL, NULL, data, len);
	return NULL;
	}

	static void fw_cfg_machine_reset(void *opaque)
	{
	void *ptr;
	size_t len;
	FWCfgState *s = opaque;
	char *bootindex = get_boot_devices_list(&len, false);

	ptr = fw_cfg_modify_file(s, "bootorder", (uint8_t *)bootindex, len);
	g_free(ptr);
	}

	static void fw_cfg_machine_ready(struct Notifier n, void data)
	{
	FWCfgState *s = container_of(n, FWCfgState, machine_ready);
	qemu_register_reset(fw_cfg_machine_reset, s);
	}



	static void fw_cfg_init1(DeviceState *dev)
	{
	FWCfgState *s = FW_CFG(dev);

	assert(!object_resolve_path(FW_CFG_PATH, NULL));

	object_property_add_child(qdev_get_machine(), FW_CFG_NAME, OBJECT(s), NULL);

	qdev_init_nofail(dev);

	fw_cfg_add_bytes(s, FW_CFG_SIGNATURE, (char *)"QEMU", 4);
	fw_cfg_add_i32(s, FW_CFG_ID, 1);
	fw_cfg_add_bytes(s, FW_CFG_UUID, qemu_uuid, 16);
	fw_cfg_add_i16(s, FW_CFG_NOGRAPHIC, (uint16_t)(display_type == DT_NOGRAPHIC));
	fw_cfg_add_i16(s, FW_CFG_NB_CPUS, (uint16_t)smp_cpus);
	fw_cfg_add_i16(s, FW_CFG_BOOT_MENU, (uint16_t)boot_menu);
	fw_cfg_bootsplash(s);
	fw_cfg_reboot(s);

	s->machine_ready.notify = fw_cfg_machine_ready;
	qemu_add_machine_init_done_notifier(&s->machine_ready);
	}

	FWCfgState *fw_cfg_init_io(uint32_t iobase)
	{
	DeviceState *dev;

	dev = qdev_create(NULL, TYPE_FW_CFG_IO);
	qdev_prop_set_uint32(dev, "iobase", iobase);
	fw_cfg_init1(dev);

	return FW_CFG(dev);
	}

	FWCfgState *fw_cfg_init_mem_wide(hwaddr ctl_addr, hwaddr data_addr,
	uint32_t data_width)
	{
	DeviceState *dev;
	SysBusDevice *sbd;

	dev = qdev_create(NULL, TYPE_FW_CFG_MEM);
	qdev_prop_set_uint32(dev, "data_width", data_width);

	fw_cfg_init1(dev);

	sbd = SYS_BUS_DEVICE(dev);
	sysbus_mmio_map(sbd, 0, ctl_addr);
	sysbus_mmio_map(sbd, 1, data_addr);

	return FW_CFG(dev);
	}

	FWCfgState *fw_cfg_init_mem(hwaddr ctl_addr, hwaddr data_addr)
	{
	return fw_cfg_init_mem_wide(ctl_addr, data_addr,
	fw_cfg_data_mem_ops.valid.max_access_size);
	}


	FWCfgState *fw_cfg_find(void)
	{
	return FW_CFG(object_resolve_path(FW_CFG_PATH, NULL));
	}

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

	dc->reset = fw_cfg_reset;
	dc->vmsd = &vmstate_fw_cfg;
	}

	static const TypeInfo fw_cfg_info = {
	.name = TYPE_FW_CFG,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(FWCfgState),
	.class_init = fw_cfg_class_init,
	};


	static Property fw_cfg_io_properties[] = {
	DEFINE_PROP_UINT32("iobase", FWCfgIoState, iobase, -1),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void fw_cfg_io_realize(DeviceState dev, Error *errp)
	{
	FWCfgIoState *s = FW_CFG_IO(dev);
	SysBusDevice *sbd = SYS_BUS_DEVICE(dev);

	memory_region_init_io(&s->comb_iomem, OBJECT(s), &fw_cfg_comb_mem_ops,
	FW_CFG(s), "fwcfg", FW_CFG_SIZE);
	sysbus_add_io(sbd, s->iobase, &s->comb_iomem);
	}

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

	dc->realize = fw_cfg_io_realize;
	dc->props = fw_cfg_io_properties;
	}

	static const TypeInfo fw_cfg_io_info = {
	.name = TYPE_FW_CFG_IO,
	.parent = TYPE_FW_CFG,
	.instance_size = sizeof(FWCfgIoState),
	.class_init = fw_cfg_io_class_init,
	};


	static Property fw_cfg_mem_properties[] = {
	DEFINE_PROP_UINT32("data_width", FWCfgMemState, data_width, -1),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void fw_cfg_mem_realize(DeviceState dev, Error *errp)
	{
	FWCfgMemState *s = FW_CFG_MEM(dev);
	SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
	const MemoryRegionOps *data_ops = &fw_cfg_data_mem_ops;

	memory_region_init_io(&s->ctl_iomem, OBJECT(s), &fw_cfg_ctl_mem_ops,
	FW_CFG(s), "fwcfg.ctl", FW_CFG_SIZE);
	sysbus_init_mmio(sbd, &s->ctl_iomem);

	if (s->data_width > data_ops->valid.max_access_size) {
	/* memberwise copy because the "old_mmio" member is const */
	s->wide_data_ops.read = data_ops->read;
	s->wide_data_ops.write = data_ops->write;
	s->wide_data_ops.endianness = data_ops->endianness;
	s->wide_data_ops.valid = data_ops->valid;
	s->wide_data_ops.impl = data_ops->impl;

	s->wide_data_ops.valid.max_access_size = s->data_width;
	s->wide_data_ops.impl.max_access_size = s->data_width;
	data_ops = &s->wide_data_ops;
	}
	memory_region_init_io(&s->data_iomem, OBJECT(s), data_ops, FW_CFG(s),
	"fwcfg.data", data_ops->valid.max_access_size);
	sysbus_init_mmio(sbd, &s->data_iomem);
	}

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

	dc->realize = fw_cfg_mem_realize;
	dc->props = fw_cfg_mem_properties;
	}

	static const TypeInfo fw_cfg_mem_info = {
	.name = TYPE_FW_CFG_MEM,
	.parent = TYPE_FW_CFG,
	.instance_size = sizeof(FWCfgMemState),
	.class_init = fw_cfg_mem_class_init,
	};


	static void fw_cfg_register_types(void)
	{
	type_register_static(&fw_cfg_info);
	type_register_static(&fw_cfg_io_info);
	type_register_static(&fw_cfg_mem_info);
	}

	type_init(fw_cfg_register_types)