diff --git a/hw/ppc/ppc.c b/hw/ppc/ppc.c
index 5ce565d..99db56c 100644
--- a/hw/ppc/ppc.c
+++ b/hw/ppc/ppc.c
@@ -1318,167 +1318,6 @@ void PPC_debug_write (void *opaque, uint32_t addr, uint32_t val)
     }
 }
 
-/*****************************************************************************/
-/* NVRAM helpers */
-static inline uint32_t nvram_read (nvram_t *nvram, uint32_t addr)
-{
-    return (*nvram->read_fn)(nvram->opaque, addr);
-}
-
-static inline void nvram_write (nvram_t *nvram, uint32_t addr, uint32_t val)
-{
-    (*nvram->write_fn)(nvram->opaque, addr, val);
-}
-
-static void NVRAM_set_byte(nvram_t *nvram, uint32_t addr, uint8_t value)
-{
-    nvram_write(nvram, addr, value);
-}
-
-static uint8_t NVRAM_get_byte(nvram_t *nvram, uint32_t addr)
-{
-    return nvram_read(nvram, addr);
-}
-
-static void NVRAM_set_word(nvram_t *nvram, uint32_t addr, uint16_t value)
-{
-    nvram_write(nvram, addr, value >> 8);
-    nvram_write(nvram, addr + 1, value & 0xFF);
-}
-
-static uint16_t NVRAM_get_word(nvram_t *nvram, uint32_t addr)
-{
-    uint16_t tmp;
-
-    tmp = nvram_read(nvram, addr) << 8;
-    tmp |= nvram_read(nvram, addr + 1);
-
-    return tmp;
-}
-
-static void NVRAM_set_lword(nvram_t *nvram, uint32_t addr, uint32_t value)
-{
-    nvram_write(nvram, addr, value >> 24);
-    nvram_write(nvram, addr + 1, (value >> 16) & 0xFF);
-    nvram_write(nvram, addr + 2, (value >> 8) & 0xFF);
-    nvram_write(nvram, addr + 3, value & 0xFF);
-}
-
-uint32_t NVRAM_get_lword (nvram_t *nvram, uint32_t addr)
-{
-    uint32_t tmp;
-
-    tmp = nvram_read(nvram, addr) << 24;
-    tmp |= nvram_read(nvram, addr + 1) << 16;
-    tmp |= nvram_read(nvram, addr + 2) << 8;
-    tmp |= nvram_read(nvram, addr + 3);
-
-    return tmp;
-}
-
-static void NVRAM_set_string(nvram_t *nvram, uint32_t addr, const char *str,
-                             uint32_t max)
-{
-    int i;
-
-    for (i = 0; i < max && str[i] != '\0'; i++) {
-        nvram_write(nvram, addr + i, str[i]);
-    }
-    nvram_write(nvram, addr + i, str[i]);
-    nvram_write(nvram, addr + max - 1, '\0');
-}
-
-int NVRAM_get_string (nvram_t *nvram, uint8_t *dst, uint16_t addr, int max)
-{
-    int i;
-
-    memset(dst, 0, max);
-    for (i = 0; i < max; i++) {
-        dst[i] = NVRAM_get_byte(nvram, addr + i);
-        if (dst[i] == '\0')
-            break;
-    }
-
-    return i;
-}
-
-static uint16_t NVRAM_crc_update (uint16_t prev, uint16_t value)
-{
-    uint16_t tmp;
-    uint16_t pd, pd1, pd2;
-
-    tmp = prev >> 8;
-    pd = prev ^ value;
-    pd1 = pd & 0x000F;
-    pd2 = ((pd >> 4) & 0x000F) ^ pd1;
-    tmp ^= (pd1 << 3) | (pd1 << 8);
-    tmp ^= pd2 | (pd2 << 7) | (pd2 << 12);
-
-    return tmp;
-}
-
-static uint16_t NVRAM_compute_crc (nvram_t *nvram, uint32_t start, uint32_t count)
-{
-    uint32_t i;
-    uint16_t crc = 0xFFFF;
-    int odd;
-
-    odd = count & 1;
-    count &= ~1;
-    for (i = 0; i != count; i++) {
-        crc = NVRAM_crc_update(crc, NVRAM_get_word(nvram, start + i));
-    }
-    if (odd) {
-        crc = NVRAM_crc_update(crc, NVRAM_get_byte(nvram, start + i) << 8);
-    }
-
-    return crc;
-}
-
-#define CMDLINE_ADDR 0x017ff000
-
-int PPC_NVRAM_set_params (nvram_t *nvram, uint16_t NVRAM_size,
-                          const char *arch,
-                          uint32_t RAM_size, int boot_device,
-                          uint32_t kernel_image, uint32_t kernel_size,
-                          const char *cmdline,
-                          uint32_t initrd_image, uint32_t initrd_size,
-                          uint32_t NVRAM_image,
-                          int width, int height, int depth)
-{
-    uint16_t crc;
-
-    /* Set parameters for Open Hack'Ware BIOS */
-    NVRAM_set_string(nvram, 0x00, "QEMU_BIOS", 16);
-    NVRAM_set_lword(nvram,  0x10, 0x00000002); /* structure v2 */
-    NVRAM_set_word(nvram,   0x14, NVRAM_size);
-    NVRAM_set_string(nvram, 0x20, arch, 16);
-    NVRAM_set_lword(nvram,  0x30, RAM_size);
-    NVRAM_set_byte(nvram,   0x34, boot_device);
-    NVRAM_set_lword(nvram,  0x38, kernel_image);
-    NVRAM_set_lword(nvram,  0x3C, kernel_size);
-    if (cmdline) {
-        /* XXX: put the cmdline in NVRAM too ? */
-        pstrcpy_targphys("cmdline", CMDLINE_ADDR, RAM_size - CMDLINE_ADDR, cmdline);
-        NVRAM_set_lword(nvram,  0x40, CMDLINE_ADDR);
-        NVRAM_set_lword(nvram,  0x44, strlen(cmdline));
-    } else {
-        NVRAM_set_lword(nvram,  0x40, 0);
-        NVRAM_set_lword(nvram,  0x44, 0);
-    }
-    NVRAM_set_lword(nvram,  0x48, initrd_image);
-    NVRAM_set_lword(nvram,  0x4C, initrd_size);
-    NVRAM_set_lword(nvram,  0x50, NVRAM_image);
-
-    NVRAM_set_word(nvram,   0x54, width);
-    NVRAM_set_word(nvram,   0x56, height);
-    NVRAM_set_word(nvram,   0x58, depth);
-    crc = NVRAM_compute_crc(nvram, 0x00, 0xF8);
-    NVRAM_set_word(nvram,   0xFC, crc);
-
-    return 0;
-}
-
 /* CPU device-tree ID helpers */
 int ppc_get_vcpu_dt_id(PowerPCCPU *cpu)
 {
diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c
index 15df7f3..9290846 100644
--- a/hw/ppc/prep.c
+++ b/hw/ppc/prep.c
@@ -181,7 +181,7 @@ static const MemoryRegionOps PPC_XCSR_ops = {
 /* Fake super-io ports for PREP platform (Intel 82378ZB) */
 typedef struct sysctrl_t {
     qemu_irq reset_irq;
-    M48t59State *nvram;
+    Nvram *nvram;
     uint8_t state;
     uint8_t syscontrol;
     int contiguous_map;
@@ -235,13 +235,17 @@ static void PREP_io_800_writeb (void *opaque, uint32_t addr, uint32_t val)
         break;
     case 0x0810:
         /* Password protect 1 register */
-        if (sysctrl->nvram != NULL)
-            m48t59_toggle_lock(sysctrl->nvram, 1);
+        if (sysctrl->nvram != NULL) {
+            NvramClass *k = NVRAM_GET_CLASS(sysctrl->nvram);
+            (k->toggle_lock)(sysctrl->nvram, 1);
+        }
         break;
     case 0x0812:
         /* Password protect 2 register */
-        if (sysctrl->nvram != NULL)
-            m48t59_toggle_lock(sysctrl->nvram, 2);
+        if (sysctrl->nvram != NULL) {
+            NvramClass *k = NVRAM_GET_CLASS(sysctrl->nvram);
+            (k->toggle_lock)(sysctrl->nvram, 2);
+        }
         break;
     case 0x0814:
         /* L2 invalidate register */
@@ -360,6 +364,144 @@ static const MemoryRegionPortio prep_portio_list[] = {
 
 static PortioList prep_port_list;
 
+/*****************************************************************************/
+/* NVRAM helpers */
+static inline uint32_t nvram_read(Nvram *nvram, uint32_t addr)
+{
+    NvramClass *k = NVRAM_GET_CLASS(sysctrl->nvram);
+    return (k->read)(nvram, addr);
+}
+
+static inline void nvram_write(Nvram *nvram, uint32_t addr, uint32_t val)
+{
+    NvramClass *k = NVRAM_GET_CLASS(sysctrl->nvram);
+    (k->write)(nvram, addr, val);
+}
+
+static void NVRAM_set_byte(Nvram *nvram, uint32_t addr, uint8_t value)
+{
+    nvram_write(nvram, addr, value);
+}
+
+static uint8_t NVRAM_get_byte(Nvram *nvram, uint32_t addr)
+{
+    return nvram_read(nvram, addr);
+}
+
+static void NVRAM_set_word(Nvram *nvram, uint32_t addr, uint16_t value)
+{
+    nvram_write(nvram, addr, value >> 8);
+    nvram_write(nvram, addr + 1, value & 0xFF);
+}
+
+static uint16_t NVRAM_get_word(Nvram *nvram, uint32_t addr)
+{
+    uint16_t tmp;
+
+    tmp = nvram_read(nvram, addr) << 8;
+    tmp |= nvram_read(nvram, addr + 1);
+
+    return tmp;
+}
+
+static void NVRAM_set_lword(Nvram *nvram, uint32_t addr, uint32_t value)
+{
+    nvram_write(nvram, addr, value >> 24);
+    nvram_write(nvram, addr + 1, (value >> 16) & 0xFF);
+    nvram_write(nvram, addr + 2, (value >> 8) & 0xFF);
+    nvram_write(nvram, addr + 3, value & 0xFF);
+}
+
+static void NVRAM_set_string(Nvram *nvram, uint32_t addr, const char *str,
+                             uint32_t max)
+{
+    int i;
+
+    for (i = 0; i < max && str[i] != '\0'; i++) {
+        nvram_write(nvram, addr + i, str[i]);
+    }
+    nvram_write(nvram, addr + i, str[i]);
+    nvram_write(nvram, addr + max - 1, '\0');
+}
+
+static uint16_t NVRAM_crc_update (uint16_t prev, uint16_t value)
+{
+    uint16_t tmp;
+    uint16_t pd, pd1, pd2;
+
+    tmp = prev >> 8;
+    pd = prev ^ value;
+    pd1 = pd & 0x000F;
+    pd2 = ((pd >> 4) & 0x000F) ^ pd1;
+    tmp ^= (pd1 << 3) | (pd1 << 8);
+    tmp ^= pd2 | (pd2 << 7) | (pd2 << 12);
+
+    return tmp;
+}
+
+static uint16_t NVRAM_compute_crc (Nvram *nvram, uint32_t start, uint32_t count)
+{
+    uint32_t i;
+    uint16_t crc = 0xFFFF;
+    int odd;
+
+    odd = count & 1;
+    count &= ~1;
+    for (i = 0; i != count; i++) {
+        crc = NVRAM_crc_update(crc, NVRAM_get_word(nvram, start + i));
+    }
+    if (odd) {
+        crc = NVRAM_crc_update(crc, NVRAM_get_byte(nvram, start + i) << 8);
+    }
+
+    return crc;
+}
+
+#define CMDLINE_ADDR 0x017ff000
+
+static int PPC_NVRAM_set_params (Nvram *nvram, uint16_t NVRAM_size,
+                          const char *arch,
+                          uint32_t RAM_size, int boot_device,
+                          uint32_t kernel_image, uint32_t kernel_size,
+                          const char *cmdline,
+                          uint32_t initrd_image, uint32_t initrd_size,
+                          uint32_t NVRAM_image,
+                          int width, int height, int depth)
+{
+    uint16_t crc;
+
+    /* Set parameters for Open Hack'Ware BIOS */
+    NVRAM_set_string(nvram, 0x00, "QEMU_BIOS", 16);
+    NVRAM_set_lword(nvram,  0x10, 0x00000002); /* structure v2 */
+    NVRAM_set_word(nvram,   0x14, NVRAM_size);
+    NVRAM_set_string(nvram, 0x20, arch, 16);
+    NVRAM_set_lword(nvram,  0x30, RAM_size);
+    NVRAM_set_byte(nvram,   0x34, boot_device);
+    NVRAM_set_lword(nvram,  0x38, kernel_image);
+    NVRAM_set_lword(nvram,  0x3C, kernel_size);
+    if (cmdline) {
+        /* XXX: put the cmdline in NVRAM too ? */
+        pstrcpy_targphys("cmdline", CMDLINE_ADDR, RAM_size - CMDLINE_ADDR,
+                         cmdline);
+        NVRAM_set_lword(nvram,  0x40, CMDLINE_ADDR);
+        NVRAM_set_lword(nvram,  0x44, strlen(cmdline));
+    } else {
+        NVRAM_set_lword(nvram,  0x40, 0);
+        NVRAM_set_lword(nvram,  0x44, 0);
+    }
+    NVRAM_set_lword(nvram,  0x48, initrd_image);
+    NVRAM_set_lword(nvram,  0x4C, initrd_size);
+    NVRAM_set_lword(nvram,  0x50, NVRAM_image);
+
+    NVRAM_set_word(nvram,   0x54, width);
+    NVRAM_set_word(nvram,   0x56, height);
+    NVRAM_set_word(nvram,   0x58, depth);
+    crc = NVRAM_compute_crc(nvram, 0x00, 0xF8);
+    NVRAM_set_word(nvram,   0xFC, crc);
+
+    return 0;
+}
+
 /* PowerPC PREP hardware initialisation */
 static void ppc_prep_init(MachineState *machine)
 {
@@ -372,8 +514,7 @@ static void ppc_prep_init(MachineState *machine)
     MemoryRegion *sysmem = get_system_memory();
     PowerPCCPU *cpu = NULL;
     CPUPPCState *env = NULL;
-    nvram_t nvram;
-    M48t59State *m48t59;
+    Nvram *m48t59;
 #if 0
     MemoryRegion *xcsr = g_new(MemoryRegion, 1);
 #endif
@@ -549,10 +690,8 @@ static void ppc_prep_init(MachineState *machine)
     sysctrl->nvram = m48t59;
 
     /* Initialise NVRAM */
-    nvram.opaque = m48t59;
-    nvram.read_fn = &m48t59_read;
-    nvram.write_fn = &m48t59_write;
-    PPC_NVRAM_set_params(&nvram, NVRAM_SIZE, "PREP", ram_size, ppc_boot_device,
+    PPC_NVRAM_set_params(m48t59, NVRAM_SIZE, "PREP", ram_size,
+                         ppc_boot_device,
                          kernel_base, kernel_size,
                          kernel_cmdline,
                          initrd_base, initrd_size,
diff --git a/hw/sparc/sun4m.c b/hw/sparc/sun4m.c
index 09afccf..d391f8e 100644
--- a/hw/sparc/sun4m.c
+++ b/hw/sparc/sun4m.c
@@ -127,7 +127,7 @@ static void fw_cfg_boot_set(void *opaque, const char *boot_device,
     fw_cfg_add_i16(opaque, FW_CFG_BOOT_DEVICE, boot_device[0]);
 }
 
-static void nvram_init(M48t59State *nvram, uint8_t *macaddr,
+static void nvram_init(Nvram *nvram, uint8_t *macaddr,
                        const char *cmdline, const char *boot_devices,
                        ram_addr_t RAM_size, uint32_t kernel_size,
                        int width, int height, int depth,
@@ -137,6 +137,7 @@ static void nvram_init(M48t59State *nvram, uint8_t *macaddr,
     uint32_t start, end;
     uint8_t image[0x1ff0];
     struct OpenBIOS_nvpart_v1 *part_header;
+    NvramClass *k = NVRAM_GET_CLASS(nvram);
 
     memset(image, '\0', sizeof(image));
 
@@ -170,8 +171,9 @@ static void nvram_init(M48t59State *nvram, uint8_t *macaddr,
     Sun_init_header((struct Sun_nvram *)&image[0x1fd8], macaddr,
                     nvram_machine_id);
 
-    for (i = 0; i < sizeof(image); i++)
-        m48t59_write(nvram, i, image[i]);
+    for (i = 0; i < sizeof(image); i++) {
+        (k->write)(nvram, i, image[i]);
+    }
 }
 
 static DeviceState *slavio_intctl;
diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
index b310588..9873e39 100644
--- a/hw/sparc64/sun4u.c
+++ b/hw/sparc64/sun4u.c
@@ -130,7 +130,7 @@ static void fw_cfg_boot_set(void *opaque, const char *boot_device,
     fw_cfg_add_i16(opaque, FW_CFG_BOOT_DEVICE, boot_device[0]);
 }
 
-static int sun4u_NVRAM_set_params(M48t59State *nvram, uint16_t NVRAM_size,
+static int sun4u_NVRAM_set_params(Nvram *nvram, uint16_t NVRAM_size,
                                   const char *arch, ram_addr_t RAM_size,
                                   const char *boot_devices,
                                   uint32_t kernel_image, uint32_t kernel_size,
@@ -144,6 +144,7 @@ static int sun4u_NVRAM_set_params(M48t59State *nvram, uint16_t NVRAM_size,
     uint32_t start, end;
     uint8_t image[0x1ff0];
     struct OpenBIOS_nvpart_v1 *part_header;
+    NvramClass *k = NVRAM_GET_CLASS(nvram);
 
     memset(image, '\0', sizeof(image));
 
@@ -176,8 +177,9 @@ static int sun4u_NVRAM_set_params(M48t59State *nvram, uint16_t NVRAM_size,
 
     Sun_init_header((struct Sun_nvram *)&image[0x1fd8], macaddr, 0x80);
 
-    for (i = 0; i < sizeof(image); i++)
-        m48t59_write(nvram, i, image[i]);
+    for (i = 0; i < sizeof(image); i++) {
+        (k->write)(nvram, i, image[i]);
+    }
 
     return 0;
 }
@@ -818,7 +820,7 @@ static void sun4uv_init(MemoryRegion *address_space_mem,
                         const struct hwdef *hwdef)
 {
     SPARCCPU *cpu;
-    M48t59State *nvram;
+    Nvram *nvram;
     unsigned int i;
     uint64_t initrd_addr, initrd_size, kernel_addr, kernel_size, kernel_entry;
     PCIBus *pci_bus, *pci_bus2, *pci_bus3;
diff --git a/hw/timer/m48t59.c b/hw/timer/m48t59.c
index c5e74ce..08f0d57 100644
--- a/hw/timer/m48t59.c
+++ b/hw/timer/m48t59.c
@@ -74,7 +74,7 @@ typedef struct M48txxInfo {
  * http://www.st.com/stonline/products/literature/od/7001/m48t59y.pdf
  */
 
-struct M48t59State {
+typedef struct M48t59State {
     /* Hardware parameters */
     qemu_irq IRQ;
     MemoryRegion iomem;
@@ -93,7 +93,7 @@ struct M48t59State {
     /* NVRAM storage */
     uint16_t addr;
     uint8_t  lock;
-};
+} M48t59State;
 
 typedef struct M48txxISAState {
     ISADevice parent_obj;
@@ -240,9 +240,8 @@ static void set_up_watchdog(M48t59State *NVRAM, uint8_t value)
 }
 
 /* Direct access to NVRAM */
-void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
+static void m48t59_write(M48t59State *NVRAM, uint32_t addr, uint32_t val)
 {
-    M48t59State *NVRAM = opaque;
     struct tm tm;
     int tmp;
 
@@ -410,9 +409,8 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
     }
 }
 
-uint32_t m48t59_read (void *opaque, uint32_t addr)
+static uint32_t m48t59_read(M48t59State *NVRAM, uint32_t addr)
 {
-    M48t59State *NVRAM = opaque;
     struct tm tm;
     uint32_t retval = 0xFF;
 
@@ -519,10 +517,8 @@ uint32_t m48t59_read (void *opaque, uint32_t addr)
     return retval;
 }
 
-void m48t59_toggle_lock (void *opaque, int lock)
+static void m48t59_toggle_lock(M48t59State *NVRAM, int lock)
 {
-    M48t59State *NVRAM = opaque;
-
     NVRAM->lock ^= 1 << lock;
 }
 
@@ -683,13 +679,11 @@ static const MemoryRegionOps m48t59_io_ops = {
 };
 
 /* Initialisation routine */
-M48t59State *m48t59_init(qemu_irq IRQ, hwaddr mem_base,
-                         uint32_t io_base, uint16_t size, int model)
+Nvram *m48t59_init(qemu_irq IRQ, hwaddr mem_base,
+                   uint32_t io_base, uint16_t size, int model)
 {
     DeviceState *dev;
     SysBusDevice *s;
-    M48txxSysBusState *d;
-    M48t59State *state;
     int i;
 
     for (i = 0; i < ARRAY_SIZE(m48txx_info); i++) {
@@ -702,8 +696,6 @@ M48t59State *m48t59_init(qemu_irq IRQ, hwaddr mem_base,
         dev = qdev_create(NULL, m48txx_info[i].sysbus_name);
         qdev_init_nofail(dev);
         s = SYS_BUS_DEVICE(dev);
-        d = M48TXX_SYS_BUS(s);
-        state = &d->state;
         sysbus_connect_irq(s, 0, IRQ);
         if (io_base != 0) {
             memory_region_add_subregion(get_system_io(), io_base,
@@ -713,15 +705,15 @@ M48t59State *m48t59_init(qemu_irq IRQ, hwaddr mem_base,
             sysbus_mmio_map(s, 0, mem_base);
         }
 
-        return state;
+        return NVRAM(s);
     }
 
     assert(false);
     return NULL;
 }
 
-M48t59State *m48t59_init_isa(ISABus *bus, uint32_t io_base, uint16_t size,
-                             int model)
+Nvram *m48t59_init_isa(ISABus *bus, uint32_t io_base, uint16_t size,
+                       int model)
 {
     DeviceState *dev;
     int i;
@@ -736,7 +728,7 @@ M48t59State *m48t59_init_isa(ISABus *bus, uint32_t io_base, uint16_t size,
         dev = DEVICE(isa_create(bus, m48txx_info[i].isa_name));
         qdev_prop_set_uint32(dev, "iobase", io_base);
         qdev_init_nofail(dev);
-        return &M48TXX_ISA(dev)->state;
+        return NVRAM(dev);
     }
 
     assert(false);
diff --git a/include/hw/timer/m48t59.h b/include/hw/timer/m48t59.h
index ddbbda2..cf80d20 100644
--- a/include/hw/timer/m48t59.h
+++ b/include/hw/timer/m48t59.h
@@ -4,39 +4,6 @@
 #include "qemu-common.h"
 #include "qom/object.h"
 
-/* NVRAM helpers */
-typedef uint32_t (*nvram_read_t)(void *private, uint32_t addr);
-typedef void (*nvram_write_t)(void *private, uint32_t addr, uint32_t val);
-typedef struct nvram_t {
-    void *opaque;
-    nvram_read_t read_fn;
-    nvram_write_t write_fn;
-} nvram_t;
-
-uint32_t NVRAM_get_lword (nvram_t *nvram, uint32_t addr);
-int NVRAM_get_string (nvram_t *nvram, uint8_t *dst, uint16_t addr, int max);
-
-int PPC_NVRAM_set_params (nvram_t *nvram, uint16_t NVRAM_size,
-                          const char *arch,
-                          uint32_t RAM_size, int boot_device,
-                          uint32_t kernel_image, uint32_t kernel_size,
-                          const char *cmdline,
-                          uint32_t initrd_image, uint32_t initrd_size,
-                          uint32_t NVRAM_image,
-                          int width, int height, int depth);
-
-#define TYPE_SYSBUS_M48T59 "m48t59"
-
-typedef struct M48t59State M48t59State;
-
-void m48t59_write (void *private, uint32_t addr, uint32_t val);
-uint32_t m48t59_read (void *private, uint32_t addr);
-void m48t59_toggle_lock (void *private, int lock);
-M48t59State *m48t59_init_isa(ISABus *bus, uint32_t io_base, uint16_t size,
-                             int type);
-M48t59State *m48t59_init(qemu_irq IRQ, hwaddr mem_base,
-                         uint32_t io_base, uint16_t size, int type);
-
 #define TYPE_NVRAM "nvram"
 
 #define NVRAM_CLASS(klass) \
@@ -58,4 +25,9 @@ typedef struct NvramClass {
     void (*toggle_lock)(Nvram *obj, int lock);
 } NvramClass;
 
+Nvram *m48t59_init_isa(ISABus *bus, uint32_t io_base, uint16_t size,
+                       int type);
+Nvram *m48t59_init(qemu_irq IRQ, hwaddr mem_base,
+                   uint32_t io_base, uint16_t size, int type);
+
 #endif /* !NVRAM_H */
