diff --git a/hw/dec_pci.c b/hw/dec_pci.c
index f6b5a0c..f51132d 100644
--- a/hw/dec_pci.c
+++ b/hw/dec_pci.c
@@ -69,8 +69,8 @@ static int pci_dec_21154_init_device(SysBusDevice *dev)

     s = FROM_SYSBUS(DECState, dev);

-    pci_mem_config = pci_host_conf_register_mmio(&s->host_state, 0);
-    pci_mem_data = pci_host_data_register_mmio(&s->host_state, 0);
+    pci_mem_config = pci_host_conf_register_mmio(&s->host_state);
+    pci_mem_data = pci_host_data_register_mmio(&s->host_state);
     pci_mem_config = cpu_physical_memory_toggle_bswap(pci_mem_config);
     pci_mem_data = cpu_physical_memory_toggle_bswap(pci_mem_data);
     sysbus_init_mmio(dev, 0x1000, pci_mem_config);
diff --git a/hw/grackle_pci.c b/hw/grackle_pci.c
index ae69c21..b9d28a1 100644
--- a/hw/grackle_pci.c
+++ b/hw/grackle_pci.c
@@ -108,9 +108,9 @@ static int pci_grackle_init_device(SysBusDevice *dev)

     s = FROM_SYSBUS(GrackleState, dev);

-    pci_mem_config = pci_host_conf_register_mmio(&s->host_state, 0);
+    pci_mem_config = pci_host_conf_register_mmio(&s->host_state);
     pci_mem_config = cpu_physical_memory_toggle_bswap(pci_mem_config);
-    pci_mem_data = pci_host_data_register_mmio(&s->host_state, 0);
+    pci_mem_data = pci_host_data_register_mmio(&s->host_state);
     pci_mem_data = cpu_physical_memory_toggle_bswap(pci_mem_data);
     sysbus_init_mmio(dev, 0x1000, pci_mem_config);
     sysbus_init_mmio(dev, 0x1000, pci_mem_data);
diff --git a/hw/pci_host.c b/hw/pci_host.c
index bc5b771..57b8598 100644
--- a/hw/pci_host.c
+++ b/hw/pci_host.c
@@ -78,64 +78,39 @@ uint32_t pci_data_read(PCIBus *s, uint32_t addr, int len)
     return val;
 }

-static void pci_host_config_write_swap(ReadWriteHandler *handler,
-                                       pcibus_t addr, uint32_t val, int len)
+static void pci_host_config_write(ReadWriteHandler *handler,
+                                  pcibus_t addr, uint32_t val, int len)
 {
     PCIHostState *s = container_of(handler, PCIHostState, conf_handler);

     PCI_DPRINTF("%s addr %" FMT_PCIBUS " %d val %"PRIx32"\n",
                 __func__, addr, len, val);
-    val = qemu_bswap_len(val, len);
     s->config_reg = val;
 }

-static uint32_t pci_host_config_read_swap(ReadWriteHandler *handler,
-                                          pcibus_t addr, int len)
+static uint32_t pci_host_config_read(ReadWriteHandler *handler,
+                                     pcibus_t addr, int len)
 {
     PCIHostState *s = container_of(handler, PCIHostState, conf_handler);
     uint32_t val = s->config_reg;

-    val = qemu_bswap_len(val, len);
     PCI_DPRINTF("%s addr %" FMT_PCIBUS " len %d val %"PRIx32"\n",
                 __func__, addr, len, val);
     return val;
 }

-static void pci_host_config_write_noswap(ReadWriteHandler *handler,
-                                         pcibus_t addr, uint32_t val, int len)
-{
-    PCIHostState *s = container_of(handler, PCIHostState, conf_noswap_handler);
-
-    PCI_DPRINTF("%s addr %" FMT_PCIBUS " %d val %"PRIx32"\n",
-                __func__, addr, len, val);
-    s->config_reg = val;
-}
-
-static uint32_t pci_host_config_read_noswap(ReadWriteHandler *handler,
-                                            pcibus_t addr, int len)
-{
-    PCIHostState *s = container_of(handler, PCIHostState, conf_noswap_handler);
-    uint32_t val = s->config_reg;
-
-    PCI_DPRINTF("%s addr %" FMT_PCIBUS " len %d val %"PRIx32"\n",
-                __func__, addr, len, val);
-    return val;
-}
-
-static void pci_host_data_write_swap(ReadWriteHandler *handler,
-                                     pcibus_t addr, uint32_t val, int len)
+static void pci_host_data_write(ReadWriteHandler *handler,
+                                pcibus_t addr, uint32_t val, int len)
 {
     PCIHostState *s = container_of(handler, PCIHostState, data_handler);
-
-    val = qemu_bswap_len(val, len);
     PCI_DPRINTF("write addr %" FMT_PCIBUS " len %d val %x\n",
                 addr, len, val);
     if (s->config_reg & (1u << 31))
         pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
 }

-static uint32_t pci_host_data_read_swap(ReadWriteHandler *handler,
-                                        pcibus_t addr, int len)
+static uint32_t pci_host_data_read(ReadWriteHandler *handler,
+                                   pcibus_t addr, int len)
 {
     PCIHostState *s = container_of(handler, PCIHostState, data_handler);
     uint32_t val;
@@ -144,75 +119,39 @@ static uint32_t
pci_host_data_read_swap(ReadWriteHandler *handler,
     val = pci_data_read(s->bus, s->config_reg | (addr & 3), len);
     PCI_DPRINTF("read addr %" FMT_PCIBUS " len %d val %x\n",
                 addr, len, val);
-    val = qemu_bswap_len(val, len);
-    return val;
-}
-
-static void pci_host_data_write_noswap(ReadWriteHandler *handler,
-                                       pcibus_t addr, uint32_t val, int len)
-{
-    PCIHostState *s = container_of(handler, PCIHostState, data_noswap_handler);
-    PCI_DPRINTF("write addr %" FMT_PCIBUS " len %d val %x\n",
-                addr, len, val);
-    if (s->config_reg & (1u << 31))
-        pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
-}
-
-static uint32_t pci_host_data_read_noswap(ReadWriteHandler *handler,
-                                          pcibus_t addr, int len)
-{
-    PCIHostState *s = container_of(handler, PCIHostState, data_noswap_handler);
-    uint32_t val;
-    if (!(s->config_reg & (1 << 31)))
-        return 0xffffffff;
-    val = pci_data_read(s->bus, s->config_reg | (addr & 3), len);
-    PCI_DPRINTF("read addr %" FMT_PCIBUS " len %d val %x\n",
-                addr, len, val);
     return val;
 }

 static void pci_host_init(PCIHostState *s)
 {
-    s->conf_handler.write = pci_host_config_write_swap;
-    s->conf_handler.read = pci_host_config_read_swap;
-    s->conf_noswap_handler.write = pci_host_config_write_noswap;
-    s->conf_noswap_handler.read = pci_host_config_read_noswap;
-    s->data_handler.write = pci_host_data_write_swap;
-    s->data_handler.read = pci_host_data_read_swap;
-    s->data_noswap_handler.write = pci_host_data_write_noswap;
-    s->data_noswap_handler.read = pci_host_data_read_noswap;
+    s->conf_handler.write = pci_host_config_write;
+    s->conf_handler.read = pci_host_config_read;
+    s->data_handler.write = pci_host_data_write;
+    s->data_handler.read = pci_host_data_read;
 }

-int pci_host_conf_register_mmio(PCIHostState *s, int swap)
+int pci_host_conf_register_mmio(PCIHostState *s)
 {
     pci_host_init(s);
-    if (swap) {
-        return cpu_register_io_memory_simple(&s->conf_handler);
-    } else {
-        return cpu_register_io_memory_simple(&s->conf_noswap_handler);
-    }
+    return cpu_register_io_memory_simple(&s->conf_handler);
 }

 void pci_host_conf_register_ioport(pio_addr_t ioport, PCIHostState *s)
 {
     pci_host_init(s);
-    register_ioport_simple(&s->conf_noswap_handler, ioport, 4, 4);
+    register_ioport_simple(&s->conf_handler, ioport, 4, 4);
 }

-int pci_host_data_register_mmio(PCIHostState *s, int swap)
+int pci_host_data_register_mmio(PCIHostState *s)
 {
     pci_host_init(s);
-    if (swap) {
-        return cpu_register_io_memory_simple(&s->data_handler);
-    } else {
-        return cpu_register_io_memory_simple(&s->data_noswap_handler);
-    }
+    return cpu_register_io_memory_simple(&s->data_handler);
 }

 void pci_host_data_register_ioport(pio_addr_t ioport, PCIHostState *s)
 {
     pci_host_init(s);
-    register_ioport_simple(&s->data_noswap_handler, ioport, 4, 1);
-    register_ioport_simple(&s->data_noswap_handler, ioport, 4, 2);
-    register_ioport_simple(&s->data_noswap_handler, ioport, 4, 4);
+    register_ioport_simple(&s->data_handler, ioport, 4, 1);
+    register_ioport_simple(&s->data_handler, ioport, 4, 2);
+    register_ioport_simple(&s->data_handler, ioport, 4, 4);
 }
diff --git a/hw/pci_host.h b/hw/pci_host.h
index bd8ede8..c70c044 100644
--- a/hw/pci_host.h
+++ b/hw/pci_host.h
@@ -33,9 +33,7 @@

 struct PCIHostState {
     SysBusDevice busdev;
-    ReadWriteHandler conf_noswap_handler;
     ReadWriteHandler conf_handler;
-    ReadWriteHandler data_noswap_handler;
     ReadWriteHandler data_handler;
     uint32_t config_reg;
     PCIBus *bus;
@@ -45,8 +43,8 @@ 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_conf_register_mmio(PCIHostState *s, int swap);
-int pci_host_data_register_mmio(PCIHostState *s, int swap);
+int pci_host_conf_register_mmio(PCIHostState *s);
+int pci_host_data_register_mmio(PCIHostState *s);

 /* for ioio */
 void pci_host_conf_register_ioport(pio_addr_t ioport, PCIHostState *s);
diff --git a/hw/ppc4xx_pci.c b/hw/ppc4xx_pci.c
index f7335b7..7a7b251 100644
--- a/hw/ppc4xx_pci.c
+++ b/hw/ppc4xx_pci.c
@@ -369,7 +369,7 @@ 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_mmio(&controller->pci_state, 0);
+    index = pci_host_data_register_mmio(&controller->pci_state);
     if (index < 0)
         goto free;
     index = cpu_physical_memory_toggle_bswap(index);
diff --git a/hw/ppce500_pci.c b/hw/ppce500_pci.c
index 8ac99f2..b5b7d25 100644
--- a/hw/ppce500_pci.c
+++ b/hw/ppce500_pci.c
@@ -292,13 +292,13 @@ PCIBus *ppce500_pci_init(qemu_irq pci_irqs[4],
target_phys_addr_t registers)
     controller->pci_dev = d;

     /* CFGADDR */
-    index = pci_host_conf_register_mmio(&controller->pci_state, 0);
+    index = pci_host_conf_register_mmio(&controller->pci_state);
     if (index < 0)
         goto free;
     cpu_register_physical_memory(registers + PCIE500_CFGADDR, 4, index);

     /* CFGDATA */
-    index = pci_host_data_register_mmio(&controller->pci_state, 0);
+    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/unin_pci.c b/hw/unin_pci.c
index 6694a00..5517f69 100644
--- a/hw/unin_pci.c
+++ b/hw/unin_pci.c
@@ -150,7 +150,7 @@ static int pci_unin_main_init_device(SysBusDevice *dev)
     /* Uninorth main bus */
     s = FROM_SYSBUS(UNINState, dev);

-    pci_mem_config = pci_host_conf_register_mmio(&s->host_state, 0);
+    pci_mem_config = pci_host_conf_register_mmio(&s->host_state);
     pci_mem_config = cpu_physical_memory_toggle_bswap(pci_mem_config);
     s->data_handler.read = unin_data_read;
     s->data_handler.write = unin_data_write;
@@ -173,7 +173,7 @@ static int pci_u3_agp_init_device(SysBusDevice *dev)
     /* Uninorth U3 AGP bus */
     s = FROM_SYSBUS(UNINState, dev);

-    pci_mem_config = pci_host_conf_register_mmio(&s->host_state, 0);
+    pci_mem_config = pci_host_conf_register_mmio(&s->host_state);
     pci_mem_config = cpu_physical_memory_toggle_bswap(pci_mem_config);
     s->data_handler.read = unin_data_read;
     s->data_handler.write = unin_data_write;
@@ -197,9 +197,9 @@ static int pci_unin_agp_init_device(SysBusDevice *dev)
     /* Uninorth AGP bus */
     s = FROM_SYSBUS(UNINState, dev);

-    pci_mem_config = pci_host_conf_register_mmio(&s->host_state, 0);
+    pci_mem_config = pci_host_conf_register_mmio(&s->host_state);
     pci_mem_config = cpu_physical_memory_toggle_bswap(pci_mem_config);
-    pci_mem_data = pci_host_data_register_mmio(&s->host_state, 0);
+    pci_mem_data = pci_host_data_register_mmio(&s->host_state);
     pci_mem_data = cpu_physical_memory_toggle_bswap(pci_mem_data);
     sysbus_init_mmio(dev, 0x1000, pci_mem_config);
     sysbus_init_mmio(dev, 0x1000, pci_mem_data);
@@ -214,8 +214,8 @@ static int pci_unin_internal_init_device(SysBusDevice *dev)
     /* Uninorth internal bus */
     s = FROM_SYSBUS(UNINState, dev);

-    pci_mem_config = pci_host_conf_register_mmio(&s->host_state, 0);
-    pci_mem_data = pci_host_data_register_mmio(&s->host_state, 0);
+    pci_mem_config = pci_host_conf_register_mmio(&s->host_state);
+    pci_mem_data = pci_host_data_register_mmio(&s->host_state);
     pci_mem_data = cpu_physical_memory_toggle_bswap(pci_mem_data);
     sysbus_init_mmio(dev, 0x1000, pci_mem_config);
     sysbus_init_mmio(dev, 0x1000, pci_mem_data);
