diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index c4af1cc..e6525ac 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -447,7 +447,7 @@ static int piix4_pm_initfn(PCIDevice *dev)
 
 i2c_bus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base,
                        qemu_irq sci_irq, qemu_irq smi_irq,
-                       int kvm_enabled, void *fw_cfg)
+                       int kvm_enabled, FWCfgState *fw_cfg)
 {
     PCIDevice *dev;
     PIIX4PMState *s;
diff --git a/hw/core/loader.c b/hw/core/loader.c
index 7507914..a711145 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -733,7 +733,7 @@ int rom_load_all(void)
     return 0;
 }
 
-void rom_set_fw(void *f)
+void rom_set_fw(FWCfgState *f)
 {
     fw_cfg = f;
 }
diff --git a/hw/i386/multiboot.c b/hw/i386/multiboot.c
index d696507..09211e0 100644
--- a/hw/i386/multiboot.c
+++ b/hw/i386/multiboot.c
@@ -124,7 +124,7 @@ static void mb_add_mod(MultibootState *s,
     s->mb_mods_count++;
 }
 
-int load_multiboot(void *fw_cfg,
+int load_multiboot(FWCfgState *fw_cfg,
                    FILE *f,
                    const char *kernel_filename,
                    const char *initrd_filename,
diff --git a/hw/i386/multiboot.h b/hw/i386/multiboot.h
index 98fb1b7..60de309 100644
--- a/hw/i386/multiboot.h
+++ b/hw/i386/multiboot.h
@@ -1,7 +1,9 @@
 #ifndef QEMU_MULTIBOOT_H
 #define QEMU_MULTIBOOT_H
 
-int load_multiboot(void *fw_cfg,
+#include "hw/nvram/fw_cfg.h"
+
+int load_multiboot(FWCfgState *fw_cfg,
                    FILE *f,
                    const char *kernel_filename,
                    const char *initrd_filename,
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index f13dde5..338a672 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -593,9 +593,9 @@ static unsigned int pc_apic_id_limit(unsigned int max_cpus)
     return x86_cpu_apic_id_from_index(max_cpus - 1) + 1;
 }
 
-static void *bochs_bios_init(void)
+static FWCfgState *bochs_bios_init(void)
 {
-    void *fw_cfg;
+    FWCfgState *fw_cfg;
     uint8_t *smbios_table;
     size_t smbios_len;
     uint64_t *numa_fw_cfg;
@@ -672,7 +672,7 @@ static long get_file_size(FILE *f)
     return size;
 }
 
-static void load_linux(void *fw_cfg,
+static void load_linux(FWCfgState *fw_cfg,
                        const char *kernel_filename,
                        const char *initrd_filename,
                        const char *kernel_cmdline,
@@ -1010,19 +1010,19 @@ void pc_acpi_init(const char *default_dsdt)
     }
 }
 
-void *pc_memory_init(MemoryRegion *system_memory,
-                    const char *kernel_filename,
-                    const char *kernel_cmdline,
-                    const char *initrd_filename,
-                    ram_addr_t below_4g_mem_size,
-                    ram_addr_t above_4g_mem_size,
-                    MemoryRegion *rom_memory,
-                    MemoryRegion **ram_memory)
+FWCfgState *pc_memory_init(MemoryRegion *system_memory,
+                           const char *kernel_filename,
+                           const char *kernel_cmdline,
+                           const char *initrd_filename,
+                           ram_addr_t below_4g_mem_size,
+                           ram_addr_t above_4g_mem_size,
+                           MemoryRegion *rom_memory,
+                           MemoryRegion **ram_memory)
 {
     int linux_boot, i;
     MemoryRegion *ram, *option_rom_mr;
     MemoryRegion *ram_below_4g, *ram_above_4g;
-    void *fw_cfg;
+    FWCfgState *fw_cfg;
 
     linux_boot = (kernel_filename != NULL);
 
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index f7c80ad..207115c 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -89,7 +89,7 @@ static void pc_init1(MemoryRegion *system_memory,
     MemoryRegion *pci_memory;
     MemoryRegion *rom_memory;
     DeviceState *icc_bridge;
-    void *fw_cfg = NULL;
+    FWCfgState *fw_cfg = NULL;
 
     icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
     object_property_add_child(qdev_get_machine(), "icc-bridge",
diff --git a/hw/sparc/sun4m.c b/hw/sparc/sun4m.c
index 635115f..47439fe 100644
--- a/hw/sparc/sun4m.c
+++ b/hw/sparc/sun4m.c
@@ -873,7 +873,7 @@ static void sun4m_hw_init(const struct sun4m_hwdef *hwdef, ram_addr_t RAM_size,
     qemu_irq *cpu_halt;
     unsigned long kernel_size;
     DriveInfo *fd[MAX_FD];
-    void *fw_cfg;
+    FWCfgState *fw_cfg;
     unsigned int num_vsimms;
 
     /* init CPUs */
@@ -1591,7 +1591,7 @@ static void sun4d_hw_init(const struct sun4d_hwdef *hwdef, ram_addr_t RAM_size,
         espdma_irq, ledma_irq;
     qemu_irq esp_reset, dma_enable;
     unsigned long kernel_size;
-    void *fw_cfg;
+    FWCfgState *fw_cfg;
     DeviceState *dev;
 
     /* init CPUs */
@@ -1792,7 +1792,7 @@ static void sun4c_hw_init(const struct sun4c_hwdef *hwdef, ram_addr_t RAM_size,
     qemu_irq fdc_tc;
     unsigned long kernel_size;
     DriveInfo *fd[MAX_FD];
-    void *fw_cfg;
+    FWCfgState *fw_cfg;
     DeviceState *dev;
     unsigned int i;
 
diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
index 5c2bbd4..5ce5ed6 100644
--- a/hw/sparc64/sun4u.c
+++ b/hw/sparc64/sun4u.c
@@ -818,7 +818,7 @@ static void sun4uv_init(MemoryRegion *address_space_mem,
     qemu_irq *ivec_irqs, *pbm_irqs;
     DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
     DriveInfo *fd[MAX_FD];
-    void *fw_cfg;
+    FWCfgState *fw_cfg;
 
     /* init CPUs */
     cpu = cpu_devinit(cpu_model, hwdef);
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 417afe4..def52aa 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -9,6 +9,7 @@
 #include "net/net.h"
 #include "exec/memory.h"
 #include "hw/i386/ioapic.h"
+#include "hw/nvram/fw_cfg.h"
 
 /* PC-style peripherals (also used by other machines).  */
 
@@ -81,14 +82,14 @@ void pc_acpi_smi_interrupt(void *opaque, int irq, int level);
 void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge);
 void pc_hot_add_cpu(const int64_t id, Error **errp);
 void pc_acpi_init(const char *default_dsdt);
-void *pc_memory_init(MemoryRegion *system_memory,
-                    const char *kernel_filename,
-                    const char *kernel_cmdline,
-                    const char *initrd_filename,
-                    ram_addr_t below_4g_mem_size,
-                    ram_addr_t above_4g_mem_size,
-                    MemoryRegion *rom_memory,
-                    MemoryRegion **ram_memory);
+FWCfgState *pc_memory_init(MemoryRegion *system_memory,
+                           const char *kernel_filename,
+                           const char *kernel_cmdline,
+                           const char *initrd_filename,
+                           ram_addr_t below_4g_mem_size,
+                           ram_addr_t above_4g_mem_size,
+                           MemoryRegion *rom_memory,
+                           MemoryRegion **ram_memory);
 qemu_irq *pc_allocate_cpu_irq(void);
 DeviceState *pc_vga_init(ISABus *isa_bus, PCIBus *pci_bus);
 void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
@@ -112,7 +113,7 @@ void ioapic_init_gsi(GSIState *gsi_state, const char *parent_name);
 
 i2c_bus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base,
                        qemu_irq sci_irq, qemu_irq smi_irq,
-                       int kvm_enabled, void *fw_cfg);
+                       int kvm_enabled, FWCfgState *fw_cfg);
 void piix4_smbus_register_device(SMBusDevice *dev, uint8_t addr);
 
 /* hpet.c */
diff --git a/include/hw/loader.h b/include/hw/loader.h
index 0958f06..15d4cc9 100644
--- a/include/hw/loader.h
+++ b/include/hw/loader.h
@@ -1,6 +1,7 @@
 #ifndef LOADER_H
 #define LOADER_H
 #include "qapi/qmp/qdict.h"
+#include "hw/nvram/fw_cfg.h"
 
 /* loader.c */
 int get_image_size(const char *filename);
@@ -30,7 +31,7 @@ int rom_add_blob(const char *name, const void *blob, size_t len,
 int rom_add_elf_program(const char *name, void *data, size_t datasize,
                         size_t romsize, hwaddr addr);
 int rom_load_all(void);
-void rom_set_fw(void *f);
+void rom_set_fw(FWCfgState *f);
 int rom_copy(uint8_t *dest, hwaddr addr, size_t size);
 void *rom_ptr(hwaddr addr);
 void do_info_roms(Monitor *mon, const QDict *qdict);
