1 files changed, 19 insertions, 60 deletions

diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index e881e3b812..5bd904487f 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -37,17 +37,6 @@
 
 #define FW_CFG_FILE_SLOTS_DFLT 0x20
 
-#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)
-
 /* FW_CFG_VERSION bits */
 #define FW_CFG_VERSION      0x01
 #define FW_CFG_VERSION_DMA  0x02
@@ -61,51 +50,12 @@
 
 #define FW_CFG_DMA_SIGNATURE 0x51454d5520434647ULL /* "QEMU CFG" */
 
-typedef struct FWCfgEntry {
+struct FWCfgEntry {
     uint32_t len;
     bool allow_write;
     uint8_t *data;
     void *callback_opaque;
     FWCfgReadCallback read_callback;
-} FWCfgEntry;
-
-struct FWCfgState {
-    /*< private >*/
-    SysBusDevice parent_obj;
-    /*< public >*/
-
-    uint16_t file_slots;
-    FWCfgEntry *entries[2];
-    int *entry_order;
-    FWCfgFiles *files;
-    uint16_t cur_entry;
-    uint32_t cur_offset;
-    Notifier machine_ready;
-
-    int fw_cfg_order_override;
-
-    bool dma_enabled;
-    dma_addr_t dma_addr;
-    AddressSpace *dma_as;
-    MemoryRegion dma_iomem;
-};
-
-struct FWCfgIoState {
-    /*< private >*/
-    FWCfgState parent_obj;
-    /*< public >*/
-
-    MemoryRegion comb_iomem;
-};
-
-struct FWCfgMemState {
-    /*< private >*/
-    FWCfgState parent_obj;
-    /*< public >*/
-
-    MemoryRegion ctl_iomem, data_iomem;
-    uint32_t data_width;
-    MemoryRegionOps wide_data_ops;
 };
 
 #define JPG_FILE 0
@@ -909,17 +859,16 @@ static void fw_cfg_machine_ready(struct Notifier *n, void *data)
 
 
 
-static void fw_cfg_init1(DeviceState *dev)
+static void fw_cfg_common_realize(DeviceState *dev, Error **errp)
 {
     FWCfgState *s = FW_CFG(dev);
     MachineState *machine = MACHINE(qdev_get_machine());
     uint32_t version = FW_CFG_VERSION;
 
-    assert(!object_resolve_path(FW_CFG_PATH, NULL));
-
-    object_property_add_child(OBJECT(machine), FW_CFG_NAME, OBJECT(s), NULL);
-
-    qdev_init_nofail(dev);
+    if (!fw_cfg_find()) {
+        error_setg(errp, "at most one %s device is permitted", TYPE_FW_CFG);
+        return;
+    }
 
     fw_cfg_add_bytes(s, FW_CFG_SIGNATURE, (char *)"QEMU", 4);
     fw_cfg_add_bytes(s, FW_CFG_UUID, &qemu_uuid, 16);
@@ -952,7 +901,9 @@ FWCfgState *fw_cfg_init_io_dma(uint32_t iobase, uint32_t dma_iobase,
         qdev_prop_set_bit(dev, "dma_enabled", false);
     }
 
-    fw_cfg_init1(dev);
+    object_property_add_child(OBJECT(qdev_get_machine()), TYPE_FW_CFG,
+                              OBJECT(dev), NULL);
+    qdev_init_nofail(dev);
 
     sbd = SYS_BUS_DEVICE(dev);
     ios = FW_CFG_IO(dev);
@@ -990,7 +941,9 @@ FWCfgState *fw_cfg_init_mem_wide(hwaddr ctl_addr,
         qdev_prop_set_bit(dev, "dma_enabled", false);
     }
 
-    fw_cfg_init1(dev);
+    object_property_add_child(OBJECT(qdev_get_machine()), TYPE_FW_CFG,
+                              OBJECT(dev), NULL);
+    qdev_init_nofail(dev);
 
     sbd = SYS_BUS_DEVICE(dev);
     sysbus_mmio_map(sbd, 0, ctl_addr);
@@ -1017,9 +970,11 @@ FWCfgState *fw_cfg_init_mem(hwaddr ctl_addr, hwaddr data_addr)
 
 FWCfgState *fw_cfg_find(void)
 {
-    return FW_CFG(object_resolve_path(FW_CFG_PATH, NULL));
+    /* Returns NULL unless there is exactly one fw_cfg device */
+    return FW_CFG(object_resolve_path_type("", TYPE_FW_CFG, NULL));
 }
 
+
 static void fw_cfg_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -1091,6 +1046,8 @@ static void fw_cfg_io_realize(DeviceState *dev, Error **errp)
                               &fw_cfg_dma_mem_ops, FW_CFG(s), "fwcfg.dma",
                               sizeof(dma_addr_t));
     }
+
+    fw_cfg_common_realize(dev, errp);
 }
 
 static void fw_cfg_io_class_init(ObjectClass *klass, void *data)
@@ -1157,6 +1114,8 @@ static void fw_cfg_mem_realize(DeviceState *dev, Error **errp)
                               sizeof(dma_addr_t));
         sysbus_init_mmio(sbd, &FW_CFG(s)->dma_iomem);
     }
+
+    fw_cfg_common_realize(dev, errp);
 }
 
 static void fw_cfg_mem_class_init(ObjectClass *klass, void *data)