diff --git a/hw/apb_pci.c b/hw/apb_pci.c
index 3999879..1a16a22 100644
--- a/hw/apb_pci.c
+++ b/hw/apb_pci.c
@@ -235,10 +235,10 @@ static int pci_pbm_init_device(SysBusDevice *dev)
                                           pci_apb_iowrite, s);
     sysbus_init_mmio(dev, 0x10000ULL, pci_ioport);
     /* mem_config  */
-    pci_mem_config = pci_host_config_register_io_memory(&s->host_state);
+    pci_mem_config = pci_host_conf_register_mmio(&s->host_state);
     sysbus_init_mmio(dev, 0x10ULL, pci_mem_config);
     /* mem_data */
-    pci_mem_data = pci_host_data_register_io_memory(&s->host_state);
+    pci_mem_data = pci_host_data_register_mmio(&s->host_state);
     sysbus_init_mmio(dev, 0x10000000ULL, pci_mem_data);
     return 0;
 }
diff --git a/hw/grackle_pci.c b/hw/grackle_pci.c
index f3a8a7d..089d1fb 100644
--- a/hw/grackle_pci.c
+++ b/hw/grackle_pci.c
@@ -108,8 +108,8 @@ static int pci_grackle_init_device(SysBusDevice *dev)
 
     s = FROM_SYSBUS(GrackleState, dev);
 
-    pci_mem_config = pci_host_config_register_io_memory(&s->host_state);
-    pci_mem_data = pci_host_data_register_io_memory(&s->host_state);
+    pci_mem_config = pci_host_conf_register_mmio(&s->host_state);
+    pci_mem_data = pci_host_data_register_mmio(&s->host_state);
     sysbus_init_mmio(dev, 0x1000, pci_mem_config);
     sysbus_init_mmio(dev, 0x1000, pci_mem_data);
 
@@ -126,8 +126,8 @@ static int pci_dec_21154_init_device(SysBusDevice *dev)
 
     s = FROM_SYSBUS(GrackleState, dev);
 
-    pci_mem_config = pci_host_config_register_io_memory(&s->host_state);
-    pci_mem_data = pci_host_data_register_io_memory(&s->host_state);
+    pci_mem_config = pci_host_conf_register_mmio(&s->host_state);
+    pci_mem_data = pci_host_data_register_mmio(&s->host_state);
     sysbus_init_mmio(dev, 0x1000, pci_mem_config);
     sysbus_init_mmio(dev, 0x1000, pci_mem_data);
     return 0;
diff --git a/hw/pci_host.c b/hw/pci_host.c
index 403d040..45ddcd1 100644
--- a/hw/pci_host.c
+++ b/hw/pci_host.c
@@ -116,7 +116,7 @@ static CPUReadMemoryFunc * const pci_host_config_read[] = {
     &pci_host_config_readl,
 };
 
-int pci_host_config_register_io_memory(PCIHostState *s)
+int pci_host_conf_register_mmio(PCIHostState *s)
 {
     return cpu_register_io_memory(pci_host_config_read,
                                   pci_host_config_write, s);
@@ -156,7 +156,7 @@ static CPUReadMemoryFunc * const pci_host_config_read_noswap[] = {
     &pci_host_config_readl_noswap,
 };
 
-int pci_host_config_register_io_memory_noswap(PCIHostState *s)
+int pci_host_conf_register_mmio_noswap(PCIHostState *s)
 {
     return cpu_register_io_memory(pci_host_config_read_noswap,
                                   pci_host_config_write_noswap, s);
@@ -180,7 +180,7 @@ static uint32_t pci_host_config_readl_ioport(void *opaque, uint32_t addr)
     return val;
 }
 
-void pci_host_config_register_ioport(pio_addr_t ioport, PCIHostState *s)
+void pci_host_conf_register_ioport(pio_addr_t ioport, PCIHostState *s)
 {
     register_ioport_write(ioport, 4, 4, pci_host_config_writel_ioport, s);
     register_ioport_read(ioport, 4, 4, pci_host_config_readl_ioport, s);
@@ -203,7 +203,7 @@ static CPUReadMemoryFunc * const pci_host_data_read_mmio[] = {
     pci_host_data_readl_mmio,
 };
 
-int pci_host_data_register_io_memory(PCIHostState *s)
+int pci_host_data_register_mmio(PCIHostState *s)
 {
     return cpu_register_io_memory(pci_host_data_read_mmio,
                                   pci_host_data_write_mmio,
diff --git a/hw/pci_host.h b/hw/pci_host.h
index 7cfa693..cf3a339 100644
--- a/hw/pci_host.h
+++ b/hw/pci_host.h
@@ -40,12 +40,12 @@ void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, int len);
 uint32_t pci_data_read(PCIBus *s, uint32_t addr, int len);
 
 /* for mmio */
-int pci_host_config_register_io_memory(PCIHostState *s);
-int pci_host_config_register_io_memory_noswap(PCIHostState *s);
-int pci_host_data_register_io_memory(PCIHostState *s);
+int pci_host_conf_register_mmio(PCIHostState *s);
+int pci_host_conf_register_mmio_noswap(PCIHostState *s);
+int pci_host_data_register_mmio(PCIHostState *s);
 
 /* for ioio */
-void pci_host_config_register_ioport(pio_addr_t ioport, PCIHostState *s);
+void pci_host_conf_register_ioport(pio_addr_t ioport, PCIHostState *s);
 void pci_host_data_register_ioport(pio_addr_t ioport, PCIHostState *s);
 
 #endif /* PCI_HOST_H */
diff --git a/hw/piix_pci.c b/hw/piix_pci.c
index 5fb7d7b..a44f941 100644
--- a/hw/piix_pci.c
+++ b/hw/piix_pci.c
@@ -180,7 +180,7 @@ static int i440fx_pcihost_initfn(SysBusDevice *dev)
 {
     I440FXState *s = FROM_SYSBUS(I440FXState, dev);
 
-    pci_host_config_register_ioport(0xcf8, s);
+    pci_host_conf_register_ioport(0xcf8, s);
 
     pci_host_data_register_ioport(0xcfc, s);
     return 0;
diff --git a/hw/ppc4xx_pci.c b/hw/ppc4xx_pci.c
index 3aa7489..2d00b61 100644
--- a/hw/ppc4xx_pci.c
+++ b/hw/ppc4xx_pci.c
@@ -378,7 +378,7 @@ PCIBus *ppc4xx_pci_init(CPUState *env, qemu_irq pci_irqs[4],
     cpu_register_physical_memory(config_space + PCIC0_CFGADDR, 4, index);
 
     /* CFGDATA */
-    index = pci_host_data_register_io_memory(&controller->pci_state);
+    index = pci_host_data_register_mmio(&controller->pci_state);
     if (index < 0)
         goto free;
     cpu_register_physical_memory(config_space + PCIC0_CFGDATA, 4, index);
diff --git a/hw/ppce500_pci.c b/hw/ppce500_pci.c
index 223de3a..a72fb86 100644
--- a/hw/ppce500_pci.c
+++ b/hw/ppce500_pci.c
@@ -293,13 +293,13 @@ PCIBus *ppce500_pci_init(qemu_irq pci_irqs[4], target_phys_addr_t registers)
     controller->pci_dev = d;
 
     /* CFGADDR */
-    index = pci_host_config_register_io_memory_noswap(&controller->pci_state);
+    index = pci_host_conf_register_mmio_noswap(&controller->pci_state);
     if (index < 0)
         goto free;
     cpu_register_physical_memory(registers + PCIE500_CFGADDR, 4, index);
 
     /* CFGDATA */
-    index = pci_host_data_register_io_memory(&controller->pci_state);
+    index = pci_host_data_register_mmio(&controller->pci_state);
     if (index < 0)
         goto free;
     cpu_register_physical_memory(registers + PCIE500_CFGDATA, 4, index);
diff --git a/hw/prep_pci.c b/hw/prep_pci.c
index a338f81..aceb645 100644
--- a/hw/prep_pci.c
+++ b/hw/prep_pci.c
@@ -127,7 +127,7 @@ PCIBus *pci_prep_init(qemu_irq *pic)
     s->bus = pci_register_bus(NULL, "pci",
                               prep_set_irq, prep_map_irq, pic, 0, 4);
 
-    pci_host_config_register_ioport(0xcf8, s);
+    pci_host_conf_register_ioport(0xcf8, s);
 
     pci_host_data_register_ioport(0xcfc, s);
 
diff --git a/hw/unin_pci.c b/hw/unin_pci.c
index f089cbd..50d2897 100644
--- a/hw/unin_pci.c
+++ b/hw/unin_pci.c
@@ -84,8 +84,8 @@ static int pci_unin_main_init_device(SysBusDevice *dev)
     /* Uninorth main bus */
     s = FROM_SYSBUS(UNINState, dev);
 
-    pci_mem_config = pci_host_config_register_io_memory(&s->host_state);
-    pci_mem_data = pci_host_data_register_io_memory(&s->host_state);
+    pci_mem_config = pci_host_conf_register_mmio(&s->host_state);
+    pci_mem_data = pci_host_data_register_mmio(&s->host_state);
     sysbus_init_mmio(dev, 0x1000, pci_mem_config);
     sysbus_init_mmio(dev, 0x1000, pci_mem_data);
 
@@ -103,8 +103,8 @@ static int pci_dec_21154_init_device(SysBusDevice *dev)
     s = FROM_SYSBUS(UNINState, dev);
 
     // XXX: s = &pci_bridge[2];
-    pci_mem_config = pci_host_config_register_io_memory_noswap(&s->host_state);
-    pci_mem_data = pci_host_data_register_io_memory(&s->host_state);
+    pci_mem_config = pci_host_conf_register_mmio_noswap(&s->host_state);
+    pci_mem_data = pci_host_data_register_mmio(&s->host_state);
     sysbus_init_mmio(dev, 0x1000, pci_mem_config);
     sysbus_init_mmio(dev, 0x1000, pci_mem_data);
     return 0;
@@ -118,8 +118,8 @@ static int pci_unin_agp_init_device(SysBusDevice *dev)
     /* Uninorth AGP bus */
     s = FROM_SYSBUS(UNINState, dev);
 
-    pci_mem_config = pci_host_config_register_io_memory_noswap(&s->host_state);
-    pci_mem_data = pci_host_data_register_io_memory(&s->host_state);
+    pci_mem_config = pci_host_conf_register_mmio_noswap(&s->host_state);
+    pci_mem_data = pci_host_data_register_mmio(&s->host_state);
     sysbus_init_mmio(dev, 0x1000, pci_mem_config);
     sysbus_init_mmio(dev, 0x1000, pci_mem_data);
     return 0;
@@ -133,8 +133,8 @@ static int pci_unin_internal_init_device(SysBusDevice *dev)
     /* Uninorth internal bus */
     s = FROM_SYSBUS(UNINState, dev);
 
-    pci_mem_config = pci_host_config_register_io_memory_noswap(&s->host_state);
-    pci_mem_data = pci_host_data_register_io_memory(&s->host_state);
+    pci_mem_config = pci_host_conf_register_mmio_noswap(&s->host_state);
+    pci_mem_data = pci_host_data_register_mmio(&s->host_state);
     sysbus_init_mmio(dev, 0x1000, pci_mem_config);
     sysbus_init_mmio(dev, 0x1000, pci_mem_data);
     return 0;
