diff --git a/MAINTAINERS b/MAINTAINERS
index da10756abf..9b2aa18e1f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1183,6 +1183,7 @@ F: hw/intc/loongson_liointc.c
 F: hw/mips/loongson3_bootp.c
 F: hw/mips/loongson3_bootp.h
 F: hw/mips/loongson3_virt.c
+F: tests/acceptance/machine_mips_loongson3v.py
 
 Boston
 M: Paul Burton <paulburton@kernel.org>
diff --git a/hw/intc/loongson_liointc.c b/hw/intc/loongson_liointc.c
index f823d484e0..cc11b544cb 100644
--- a/hw/intc/loongson_liointc.c
+++ b/hw/intc/loongson_liointc.c
@@ -41,7 +41,7 @@
 #define R_IEN_CLR               0x2c
 #define R_ISR_SIZE              0x8
 #define R_START                 0x40
-#define R_END                   0x64
+#define R_END                   (R_START + R_ISR_SIZE * NUM_CORES)
 
 struct loongson_liointc {
     SysBusDevice parent_obj;
@@ -125,7 +125,12 @@ liointc_read(void *opaque, hwaddr addr, unsigned int size)
     }
 
     if (addr >= R_START && addr < R_END) {
-        int core = (addr - R_START) / R_ISR_SIZE;
+        hwaddr offset = addr - R_START;
+        int core = offset / R_ISR_SIZE;
+
+        if (offset % R_ISR_SIZE) {
+            goto out;
+        }
         r = p->per_core_isr[core];
         goto out;
     }
@@ -169,7 +174,12 @@ liointc_write(void *opaque, hwaddr addr,
     }
 
     if (addr >= R_START && addr < R_END) {
-        int core = (addr - R_START) / R_ISR_SIZE;
+        hwaddr offset = addr - R_START;
+        int core = offset / R_ISR_SIZE;
+
+        if (offset % R_ISR_SIZE) {
+            goto out;
+        }
         p->per_core_isr[core] = value;
         goto out;
     }
diff --git a/hw/isa/trace-events b/hw/isa/trace-events
index d267d3e652..641d69eedf 100644
--- a/hw/isa/trace-events
+++ b/hw/isa/trace-events
@@ -17,5 +17,7 @@ apm_io_write(uint8_t addr, uint8_t val) "write addr=0x%x val=0x%02x"
 # vt82c686.c
 via_isa_write(uint32_t addr, uint32_t val, int len) "addr 0x%x val 0x%x len 0x%x"
 via_pm_write(uint32_t addr, uint32_t val, int len) "addr 0x%x val 0x%x len 0x%x"
+via_pm_io_read(uint32_t addr, uint32_t val, int len) "addr 0x%x val 0x%x len 0x%x"
+via_pm_io_write(uint32_t addr, uint32_t val, int len) "addr 0x%x val 0x%x len 0x%x"
 via_superio_read(uint8_t addr, uint8_t val) "addr 0x%x val 0x%x"
 via_superio_write(uint8_t addr, uint32_t val) "addr 0x%x val 0x%x"
diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
index a6f5a0843d..5db9b1706c 100644
--- a/hw/isa/vt82c686.c
+++ b/hw/isa/vt82c686.c
@@ -16,70 +16,291 @@
 #include "hw/qdev-properties.h"
 #include "hw/isa/isa.h"
 #include "hw/isa/superio.h"
+#include "hw/intc/i8259.h"
+#include "hw/irq.h"
+#include "hw/dma/i8257.h"
+#include "hw/timer/i8254.h"
+#include "hw/rtc/mc146818rtc.h"
 #include "migration/vmstate.h"
 #include "hw/isa/apm.h"
 #include "hw/acpi/acpi.h"
 #include "hw/i2c/pm_smbus.h"
 #include "qapi/error.h"
+#include "qemu/log.h"
 #include "qemu/module.h"
+#include "qemu/range.h"
 #include "qemu/timer.h"
 #include "exec/address-spaces.h"
 #include "trace.h"
 
-typedef struct SuperIOConfig {
-    uint8_t regs[0x100];
-    uint8_t index;
-    uint8_t data;
-} SuperIOConfig;
+#define TYPE_VIA_PM "via-pm"
+OBJECT_DECLARE_SIMPLE_TYPE(ViaPMState, VIA_PM)
 
-struct VT82C686BISAState {
+struct ViaPMState {
     PCIDevice dev;
-    MemoryRegion superio;
-    SuperIOConfig superio_cfg;
+    MemoryRegion io;
+    ACPIREGS ar;
+    APMState apm;
+    PMSMBus smb;
 };
 
-OBJECT_DECLARE_SIMPLE_TYPE(VT82C686BISAState, VT82C686B_ISA)
+static void pm_io_space_update(ViaPMState *s)
+{
+    uint32_t pmbase = pci_get_long(s->dev.config + 0x48) & 0xff80UL;
+
+    memory_region_transaction_begin();
+    memory_region_set_address(&s->io, pmbase);
+    memory_region_set_enabled(&s->io, s->dev.config[0x41] & BIT(7));
+    memory_region_transaction_commit();
+}
+
+static void smb_io_space_update(ViaPMState *s)
+{
+    uint32_t smbase = pci_get_long(s->dev.config + 0x90) & 0xfff0UL;
+
+    memory_region_transaction_begin();
+    memory_region_set_address(&s->smb.io, smbase);
+    memory_region_set_enabled(&s->smb.io, s->dev.config[0xd2] & BIT(0));
+    memory_region_transaction_commit();
+}
+
+static int vmstate_acpi_post_load(void *opaque, int version_id)
+{
+    ViaPMState *s = opaque;
+
+    pm_io_space_update(s);
+    smb_io_space_update(s);
+    return 0;
+}
+
+static const VMStateDescription vmstate_acpi = {
+    .name = "vt82c686b_pm",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .post_load = vmstate_acpi_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_PCI_DEVICE(dev, ViaPMState),
+        VMSTATE_UINT16(ar.pm1.evt.sts, ViaPMState),
+        VMSTATE_UINT16(ar.pm1.evt.en, ViaPMState),
+        VMSTATE_UINT16(ar.pm1.cnt.cnt, ViaPMState),
+        VMSTATE_STRUCT(apm, ViaPMState, 0, vmstate_apm, APMState),
+        VMSTATE_TIMER_PTR(ar.tmr.timer, ViaPMState),
+        VMSTATE_INT64(ar.tmr.overflow_time, ViaPMState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void pm_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int len)
+{
+    ViaPMState *s = VIA_PM(d);
+
+    trace_via_pm_write(addr, val, len);
+    pci_default_write_config(d, addr, val, len);
+    if (ranges_overlap(addr, len, 0x48, 4)) {
+        uint32_t v = pci_get_long(s->dev.config + 0x48);
+        pci_set_long(s->dev.config + 0x48, (v & 0xff80UL) | 1);
+    }
+    if (range_covers_byte(addr, len, 0x41)) {
+        pm_io_space_update(s);
+    }
+    if (ranges_overlap(addr, len, 0x90, 4)) {
+        uint32_t v = pci_get_long(s->dev.config + 0x90);
+        pci_set_long(s->dev.config + 0x90, (v & 0xfff0UL) | 1);
+    }
+    if (range_covers_byte(addr, len, 0xd2)) {
+        s->dev.config[0xd2] &= 0xf;
+        smb_io_space_update(s);
+    }
+}
+
+static void pm_io_write(void *op, hwaddr addr, uint64_t data, unsigned size)
+{
+    trace_via_pm_io_write(addr, data, size);
+}
+
+static uint64_t pm_io_read(void *op, hwaddr addr, unsigned size)
+{
+    trace_via_pm_io_read(addr, 0, size);
+    return 0;
+}
+
+static const MemoryRegionOps pm_io_ops = {
+    .read = pm_io_read,
+    .write = pm_io_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .impl = {
+        .min_access_size = 1,
+        .max_access_size = 1,
+    },
+};
+
+static void pm_update_sci(ViaPMState *s)
+{
+    int sci_level, pmsts;
+
+    pmsts = acpi_pm1_evt_get_sts(&s->ar);
+    sci_level = (((pmsts & s->ar.pm1.evt.en) &
+                  (ACPI_BITMASK_RT_CLOCK_ENABLE |
+                   ACPI_BITMASK_POWER_BUTTON_ENABLE |
+                   ACPI_BITMASK_GLOBAL_LOCK_ENABLE |
+                   ACPI_BITMASK_TIMER_ENABLE)) != 0);
+    pci_set_irq(&s->dev, sci_level);
+    /* schedule a timer interruption if needed */
+    acpi_pm_tmr_update(&s->ar, (s->ar.pm1.evt.en & ACPI_BITMASK_TIMER_ENABLE) &&
+                       !(pmsts & ACPI_BITMASK_TIMER_STATUS));
+}
+
+static void pm_tmr_timer(ACPIREGS *ar)
+{
+    ViaPMState *s = container_of(ar, ViaPMState, ar);
+    pm_update_sci(s);
+}
+
+static void via_pm_reset(DeviceState *d)
+{
+    ViaPMState *s = VIA_PM(d);
+
+    memset(s->dev.config + PCI_CONFIG_HEADER_SIZE, 0,
+           PCI_CONFIG_SPACE_SIZE - PCI_CONFIG_HEADER_SIZE);
+    /* Power Management IO base */
+    pci_set_long(s->dev.config + 0x48, 1);
+    /* SMBus IO base */
+    pci_set_long(s->dev.config + 0x90, 1);
+
+    pm_io_space_update(s);
+    smb_io_space_update(s);
+}
+
+static void via_pm_realize(PCIDevice *dev, Error **errp)
+{
+    ViaPMState *s = VIA_PM(dev);
+
+    pci_set_word(dev->config + PCI_STATUS, PCI_STATUS_FAST_BACK |
+                 PCI_STATUS_DEVSEL_MEDIUM);
+
+    pm_smbus_init(DEVICE(s), &s->smb, false);
+    memory_region_add_subregion(pci_address_space_io(dev), 0, &s->smb.io);
+    memory_region_set_enabled(&s->smb.io, false);
+
+    apm_init(dev, &s->apm, NULL, s);
+
+    memory_region_init_io(&s->io, OBJECT(dev), &pm_io_ops, s, "via-pm", 128);
+    memory_region_add_subregion(pci_address_space_io(dev), 0, &s->io);
+    memory_region_set_enabled(&s->io, false);
+
+    acpi_pm_tmr_init(&s->ar, pm_tmr_timer, &s->io);
+    acpi_pm1_evt_init(&s->ar, pm_tmr_timer, &s->io);
+    acpi_pm1_cnt_init(&s->ar, &s->io, false, false, 2);
+}
+
+typedef struct via_pm_init_info {
+    uint16_t device_id;
+} ViaPMInitInfo;
+
+static void via_pm_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+    ViaPMInitInfo *info = data;
+
+    k->realize = via_pm_realize;
+    k->config_write = pm_write_config;
+    k->vendor_id = PCI_VENDOR_ID_VIA;
+    k->device_id = info->device_id;
+    k->class_id = PCI_CLASS_BRIDGE_OTHER;
+    k->revision = 0x40;
+    dc->reset = via_pm_reset;
+    /* Reason: part of VIA south bridge, does not exist stand alone */
+    dc->user_creatable = false;
+    dc->vmsd = &vmstate_acpi;
+}
+
+static const TypeInfo via_pm_info = {
+    .name          = TYPE_VIA_PM,
+    .parent        = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(ViaPMState),
+    .abstract      = true,
+    .interfaces = (InterfaceInfo[]) {
+        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
+        { },
+    },
+};
+
+static const ViaPMInitInfo vt82c686b_pm_init_info = {
+    .device_id = PCI_DEVICE_ID_VIA_82C686B_PM,
+};
+
+static const TypeInfo vt82c686b_pm_info = {
+    .name          = TYPE_VT82C686B_PM,
+    .parent        = TYPE_VIA_PM,
+    .class_init    = via_pm_class_init,
+    .class_data    = (void *)&vt82c686b_pm_init_info,
+};
+
+static const ViaPMInitInfo vt8231_pm_init_info = {
+    .device_id = PCI_DEVICE_ID_VIA_8231_PM,
+};
+
+static const TypeInfo vt8231_pm_info = {
+    .name          = TYPE_VT8231_PM,
+    .parent        = TYPE_VIA_PM,
+    .class_init    = via_pm_class_init,
+    .class_data    = (void *)&vt8231_pm_init_info,
+};
+
+
+typedef struct SuperIOConfig {
+    uint8_t regs[0x100];
+    MemoryRegion io;
+} SuperIOConfig;
 
 static void superio_cfg_write(void *opaque, hwaddr addr, uint64_t data,
                               unsigned size)
 {
     SuperIOConfig *sc = opaque;
+    uint8_t idx = sc->regs[0];
 
-    if (addr == 0x3f0) { /* config index register */
-        sc->index = data & 0xff;
-    } else {
-        bool can_write = true;
-        /* 0x3f1, config data register */
-        trace_via_superio_write(sc->index, data & 0xff);
-        switch (sc->index) {
-        case 0x00 ... 0xdf:
-        case 0xe4:
-        case 0xe5:
-        case 0xe9 ... 0xed:
-        case 0xf3:
-        case 0xf5:
-        case 0xf7:
-        case 0xf9 ... 0xfb:
-        case 0xfd ... 0xff:
-            can_write = false;
-            break;
-        /* case 0xe6 ... 0xe8: Should set base port of parallel and serial */
-        default:
-            break;
-
-        }
-        if (can_write) {
-            sc->regs[sc->index] = data & 0xff;
-        }
+    if (addr == 0) { /* config index register */
+        sc->regs[0] = data;
+        return;
     }
+
+    /* config data register */
+    trace_via_superio_write(idx, data);
+    switch (idx) {
+    case 0x00 ... 0xdf:
+    case 0xe4:
+    case 0xe5:
+    case 0xe9 ... 0xed:
+    case 0xf3:
+    case 0xf5:
+    case 0xf7:
+    case 0xf9 ... 0xfb:
+    case 0xfd ... 0xff:
+        /* ignore write to read only registers */
+        return;
+    /* case 0xe6 ... 0xe8: Should set base port of parallel and serial */
+    default:
+        qemu_log_mask(LOG_UNIMP,
+                      "via_superio_cfg: unimplemented register 0x%x\n", idx);
+        break;
+    }
+    sc->regs[idx] = data;
 }
 
 static uint64_t superio_cfg_read(void *opaque, hwaddr addr, unsigned size)
 {
     SuperIOConfig *sc = opaque;
-    uint8_t val = sc->regs[sc->index];
+    uint8_t idx = sc->regs[0];
+    uint8_t val = sc->regs[idx];
 
-    trace_via_superio_read(sc->index, val);
+    if (addr == 0) {
+        return idx;
+    }
+    if (addr == 1 && idx == 0) {
+        val = 0; /* reading reg 0 where we store index value */
+    }
+    trace_via_superio_read(idx, val);
     return val;
 }
 
@@ -93,6 +314,44 @@ static const MemoryRegionOps superio_cfg_ops = {
     },
 };
 
+
+OBJECT_DECLARE_SIMPLE_TYPE(VT82C686BISAState, VT82C686B_ISA)
+
+struct VT82C686BISAState {
+    PCIDevice dev;
+    qemu_irq cpu_intr;
+    SuperIOConfig superio_cfg;
+};
+
+static void via_isa_request_i8259_irq(void *opaque, int irq, int level)
+{
+    VT82C686BISAState *s = opaque;
+    qemu_set_irq(s->cpu_intr, level);
+}
+
+static void vt82c686b_write_config(PCIDevice *d, uint32_t addr,
+                                   uint32_t val, int len)
+{
+    VT82C686BISAState *s = VT82C686B_ISA(d);
+
+    trace_via_isa_write(addr, val, len);
+    pci_default_write_config(d, addr, val, len);
+    if (addr == 0x85) {
+        /* BIT(1): enable or disable superio config io ports */
+        memory_region_set_enabled(&s->superio_cfg.io, val & BIT(1));
+    }
+}
+
+static const VMStateDescription vmstate_via = {
+    .name = "vt82c686b",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_PCI_DEVICE(dev, VT82C686BISAState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static void vt82c686b_isa_reset(DeviceState *dev)
 {
     VT82C686BISAState *s = VT82C686B_ISA(dev);
@@ -120,206 +379,39 @@ static void vt82c686b_isa_reset(DeviceState *dev)
     s->superio_cfg.regs[0xe8] = 0xbe; /* Serial port 2 base addr */
 }
 
-/* write config pci function0 registers. PCI-ISA bridge */
-static void vt82c686b_write_config(PCIDevice *d, uint32_t addr,
-                                   uint32_t val, int len)
-{
-    VT82C686BISAState *s = VT82C686B_ISA(d);
-
-    trace_via_isa_write(addr, val, len);
-    pci_default_write_config(d, addr, val, len);
-    if (addr == 0x85) {  /* enable or disable super IO configure */
-        memory_region_set_enabled(&s->superio, val & 0x2);
-    }
-}
-
-struct VT686PMState {
-    PCIDevice dev;
-    MemoryRegion io;
-    ACPIREGS ar;
-    APMState apm;
-    PMSMBus smb;
-    uint32_t smb_io_base;
-};
-
-OBJECT_DECLARE_SIMPLE_TYPE(VT686PMState, VT82C686B_PM)
-
-static void pm_update_sci(VT686PMState *s)
-{
-    int sci_level, pmsts;
-
-    pmsts = acpi_pm1_evt_get_sts(&s->ar);
-    sci_level = (((pmsts & s->ar.pm1.evt.en) &
-                  (ACPI_BITMASK_RT_CLOCK_ENABLE |
-                   ACPI_BITMASK_POWER_BUTTON_ENABLE |
-                   ACPI_BITMASK_GLOBAL_LOCK_ENABLE |
-                   ACPI_BITMASK_TIMER_ENABLE)) != 0);
-    pci_set_irq(&s->dev, sci_level);
-    /* schedule a timer interruption if needed */
-    acpi_pm_tmr_update(&s->ar, (s->ar.pm1.evt.en & ACPI_BITMASK_TIMER_ENABLE) &&
-                       !(pmsts & ACPI_BITMASK_TIMER_STATUS));
-}
-
-static void pm_tmr_timer(ACPIREGS *ar)
-{
-    VT686PMState *s = container_of(ar, VT686PMState, ar);
-    pm_update_sci(s);
-}
-
-static void pm_io_space_update(VT686PMState *s)
-{
-    uint32_t pm_io_base;
-
-    pm_io_base = pci_get_long(s->dev.config + 0x40);
-    pm_io_base &= 0xffc0;
-
-    memory_region_transaction_begin();
-    memory_region_set_enabled(&s->io, s->dev.config[0x80] & 1);
-    memory_region_set_address(&s->io, pm_io_base);
-    memory_region_transaction_commit();
-}
-
-static void pm_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int len)
-{
-    trace_via_pm_write(addr, val, len);
-    pci_default_write_config(d, addr, val, len);
-}
-
-static int vmstate_acpi_post_load(void *opaque, int version_id)
-{
-    VT686PMState *s = opaque;
-
-    pm_io_space_update(s);
-    return 0;
-}
-
-static const VMStateDescription vmstate_acpi = {
-    .name = "vt82c686b_pm",
-    .version_id = 1,
-    .minimum_version_id = 1,
-    .post_load = vmstate_acpi_post_load,
-    .fields = (VMStateField[]) {
-        VMSTATE_PCI_DEVICE(dev, VT686PMState),
-        VMSTATE_UINT16(ar.pm1.evt.sts, VT686PMState),
-        VMSTATE_UINT16(ar.pm1.evt.en, VT686PMState),
-        VMSTATE_UINT16(ar.pm1.cnt.cnt, VT686PMState),
-        VMSTATE_STRUCT(apm, VT686PMState, 0, vmstate_apm, APMState),
-        VMSTATE_TIMER_PTR(ar.tmr.timer, VT686PMState),
-        VMSTATE_INT64(ar.tmr.overflow_time, VT686PMState),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-/* vt82c686 pm init */
-static void vt82c686b_pm_realize(PCIDevice *dev, Error **errp)
-{
-    VT686PMState *s = VT82C686B_PM(dev);
-    uint8_t *pci_conf;
-
-    pci_conf = s->dev.config;
-    pci_set_word(pci_conf + PCI_COMMAND, 0);
-    pci_set_word(pci_conf + PCI_STATUS, PCI_STATUS_FAST_BACK |
-                 PCI_STATUS_DEVSEL_MEDIUM);
-
-    /* 0x48-0x4B is Power Management I/O Base */
-    pci_set_long(pci_conf + 0x48, 0x00000001);
-
-    /* SMB ports:0xeee0~0xeeef */
-    s->smb_io_base = ((s->smb_io_base & 0xfff0) + 0x0);
-    pci_conf[0x90] = s->smb_io_base | 1;
-    pci_conf[0x91] = s->smb_io_base >> 8;
-    pci_conf[0xd2] = 0x90;
-    pm_smbus_init(DEVICE(s), &s->smb, false);
-    memory_region_add_subregion(get_system_io(), s->smb_io_base, &s->smb.io);
-
-    apm_init(dev, &s->apm, NULL, s);
-
-    memory_region_init(&s->io, OBJECT(dev), "vt82c686-pm", 64);
-    memory_region_set_enabled(&s->io, false);
-    memory_region_add_subregion(get_system_io(), 0, &s->io);
-
-    acpi_pm_tmr_init(&s->ar, pm_tmr_timer, &s->io);
-    acpi_pm1_evt_init(&s->ar, pm_tmr_timer, &s->io);
-    acpi_pm1_cnt_init(&s->ar, &s->io, false, false, 2);
-}
-
-static Property via_pm_properties[] = {
-    DEFINE_PROP_UINT32("smb_io_base", VT686PMState, smb_io_base, 0),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
-static void via_pm_class_init(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
-
-    k->realize = vt82c686b_pm_realize;
-    k->config_write = pm_write_config;
-    k->vendor_id = PCI_VENDOR_ID_VIA;
-    k->device_id = PCI_DEVICE_ID_VIA_ACPI;
-    k->class_id = PCI_CLASS_BRIDGE_OTHER;
-    k->revision = 0x40;
-    dc->desc = "PM";
-    dc->vmsd = &vmstate_acpi;
-    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
-    device_class_set_props(dc, via_pm_properties);
-}
-
-static const TypeInfo via_pm_info = {
-    .name          = TYPE_VT82C686B_PM,
-    .parent        = TYPE_PCI_DEVICE,
-    .instance_size = sizeof(VT686PMState),
-    .class_init    = via_pm_class_init,
-    .interfaces = (InterfaceInfo[]) {
-        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
-        { },
-    },
-};
-
-static const VMStateDescription vmstate_via = {
-    .name = "vt82c686b",
-    .version_id = 1,
-    .minimum_version_id = 1,
-    .fields = (VMStateField[]) {
-        VMSTATE_PCI_DEVICE(dev, VT82C686BISAState),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-/* init the PCI-to-ISA bridge */
 static void vt82c686b_realize(PCIDevice *d, Error **errp)
 {
     VT82C686BISAState *s = VT82C686B_ISA(d);
-    uint8_t *pci_conf;
+    DeviceState *dev = DEVICE(d);
     ISABus *isa_bus;
-    uint8_t *wmask;
+    qemu_irq *isa_irq;
     int i;
 
-    isa_bus = isa_bus_new(DEVICE(d), get_system_memory(),
-                          pci_address_space_io(d), errp);
-    if (!isa_bus) {
-        return;
-    }
+    qdev_init_gpio_out(dev, &s->cpu_intr, 1);
+    isa_irq = qemu_allocate_irqs(via_isa_request_i8259_irq, s, 1);
+    isa_bus = isa_bus_new(dev, get_system_memory(), pci_address_space_io(d),
+                          &error_fatal);
+    isa_bus_irqs(isa_bus, i8259_init(isa_bus, *isa_irq));
+    i8254_pit_init(isa_bus, 0x40, 0, NULL);
+    i8257_dma_init(isa_bus, 0);
+    isa_create_simple(isa_bus, TYPE_VT82C686B_SUPERIO);
+    mc146818_rtc_init(isa_bus, 2000, NULL);
 
-    pci_conf = d->config;
-    pci_config_set_prog_interface(pci_conf, 0x0);
-
-    wmask = d->wmask;
-    for (i = 0x00; i < 0xff; i++) {
-        if (i <= 0x03 || (i >= 0x08 && i <= 0x3f)) {
-            wmask[i] = 0x00;
+    for (i = 0; i < PCI_CONFIG_HEADER_SIZE; i++) {
+        if (i < PCI_COMMAND || i >= PCI_REVISION_ID) {
+            d->wmask[i] = 0;
         }
     }
 
-    memory_region_init_io(&s->superio, OBJECT(d), &superio_cfg_ops,
-                          &s->superio_cfg, "superio", 2);
-    memory_region_set_enabled(&s->superio, false);
+    memory_region_init_io(&s->superio_cfg.io, OBJECT(d), &superio_cfg_ops,
+                          &s->superio_cfg, "superio_cfg", 2);
+    memory_region_set_enabled(&s->superio_cfg.io, false);
     /*
      * The floppy also uses 0x3f0 and 0x3f1.
      * But we do not emulate a floppy, so just set it here.
      */
     memory_region_add_subregion(isa_bus->address_space_io, 0x3f0,
-                                &s->superio);
+                                &s->superio_cfg.io);
 }
 
 static void via_class_init(ObjectClass *klass, void *data)
@@ -354,6 +446,7 @@ static const TypeInfo via_info = {
     },
 };
 
+
 static void vt82c686b_superio_class_init(ObjectClass *klass, void *data)
 {
     ISASuperIOClass *sc = ISA_SUPERIO_CLASS(klass);
@@ -372,11 +465,14 @@ static const TypeInfo via_superio_info = {
     .class_init    = vt82c686b_superio_class_init,
 };
 
+
 static void vt82c686b_register_types(void)
 {
     type_register_static(&via_pm_info);
-    type_register_static(&via_superio_info);
+    type_register_static(&vt82c686b_pm_info);
+    type_register_static(&vt8231_pm_info);
     type_register_static(&via_info);
+    type_register_static(&via_superio_info);
 }
 
 type_init(vt82c686b_register_types)
diff --git a/hw/mips/bootloader.c b/hw/mips/bootloader.c
new file mode 100644
index 0000000000..6ec8314490
--- /dev/null
+++ b/hw/mips/bootloader.c
@@ -0,0 +1,200 @@
+/*
+ * Utility for QEMU MIPS to generate it's simple bootloader
+ *
+ * Instructions used here are carefully selected to keep compatibility with
+ * MIPS Release 6.
+ *
+ * Copyright (C) 2020 Jiaxun Yang <jiaxun.yang@flygoat.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/bitops.h"
+#include "cpu.h"
+#include "hw/mips/bootloader.h"
+
+typedef enum bl_reg {
+    BL_REG_ZERO = 0,
+    BL_REG_AT = 1,
+    BL_REG_V0 = 2,
+    BL_REG_V1 = 3,
+    BL_REG_A0 = 4,
+    BL_REG_A1 = 5,
+    BL_REG_A2 = 6,
+    BL_REG_A3 = 7,
+    BL_REG_T0 = 8,
+    BL_REG_T1 = 9,
+    BL_REG_T2 = 10,
+    BL_REG_T3 = 11,
+    BL_REG_T4 = 12,
+    BL_REG_T5 = 13,
+    BL_REG_T6 = 14,
+    BL_REG_T7 = 15,
+    BL_REG_S0 = 16,
+    BL_REG_S1 = 17,
+    BL_REG_S2 = 18,
+    BL_REG_S3 = 19,
+    BL_REG_S4 = 20,
+    BL_REG_S5 = 21,
+    BL_REG_S6 = 22,
+    BL_REG_S7 = 23,
+    BL_REG_T8 = 24,
+    BL_REG_T9 = 25,
+    BL_REG_K0 = 26,
+    BL_REG_K1 = 27,
+    BL_REG_GP = 28,
+    BL_REG_SP = 29,
+    BL_REG_FP = 30,
+    BL_REG_RA = 31,
+} bl_reg;
+
+static bool bootcpu_supports_isa(uint64_t isa_mask)
+{
+    return cpu_supports_isa(&MIPS_CPU(first_cpu)->env, isa_mask);
+}
+
+/* Base types */
+static void bl_gen_nop(uint32_t **p)
+{
+    stl_p(*p, 0);
+    *p = *p + 1;
+}
+
+static void bl_gen_r_type(uint32_t **p, uint8_t opcode,
+                          bl_reg rs, bl_reg rt, bl_reg rd,
+                          uint8_t shift, uint8_t funct)
+{
+    uint32_t insn = 0;
+
+    insn = deposit32(insn, 26, 6, opcode);
+    insn = deposit32(insn, 21, 5, rs);
+    insn = deposit32(insn, 16, 5, rt);
+    insn = deposit32(insn, 11, 5, rd);
+    insn = deposit32(insn, 6, 5, shift);
+    insn = deposit32(insn, 0, 6, funct);
+
+    stl_p(*p, insn);
+    *p = *p + 1;
+}
+
+static void bl_gen_i_type(uint32_t **p, uint8_t opcode,
+                          bl_reg rs, bl_reg rt, uint16_t imm)
+{
+    uint32_t insn = 0;
+
+    insn = deposit32(insn, 26, 6, opcode);
+    insn = deposit32(insn, 21, 5, rs);
+    insn = deposit32(insn, 16, 5, rt);
+    insn = deposit32(insn, 0, 16, imm);
+
+    stl_p(*p, insn);
+    *p = *p + 1;
+}
+
+/* Single instructions */
+static void bl_gen_dsll(uint32_t **p, bl_reg rd, bl_reg rt, uint8_t sa)
+{
+    if (bootcpu_supports_isa(ISA_MIPS3)) {
+        bl_gen_r_type(p, 0, 0, rt, rd, sa, 0x38);
+    } else {
+        g_assert_not_reached(); /* unsupported */
+    }
+}
+
+static void bl_gen_jalr(uint32_t **p, bl_reg rs)
+{
+    bl_gen_r_type(p, 0, rs, 0, BL_REG_RA, 0, 0x09);
+}
+
+static void bl_gen_lui(uint32_t **p, bl_reg rt, uint16_t imm)
+{
+    /* R6: It's a alias of AUI with RS = 0 */
+    bl_gen_i_type(p, 0x0f, 0, rt, imm);
+}
+
+static void bl_gen_ori(uint32_t **p, bl_reg rt, bl_reg rs, uint16_t imm)
+{
+    bl_gen_i_type(p, 0x0d, rs, rt, imm);
+}
+
+static void bl_gen_sw(uint32_t **p, bl_reg rt, uint8_t base, uint16_t offset)
+{
+    bl_gen_i_type(p, 0x2b, base, rt, offset);
+}
+
+static void bl_gen_sd(uint32_t **p, bl_reg rt, uint8_t base, uint16_t offset)
+{
+    if (bootcpu_supports_isa(ISA_MIPS3)) {
+        bl_gen_i_type(p, 0x3f, base, rt, offset);
+    } else {
+        g_assert_not_reached(); /* unsupported */
+    }
+}
+
+/* Pseudo instructions */
+static void bl_gen_li(uint32_t **p, bl_reg rt, uint32_t imm)
+{
+    bl_gen_lui(p, rt, extract32(imm, 16, 16));
+    bl_gen_ori(p, rt, rt, extract32(imm, 0, 16));
+}
+
+static void bl_gen_dli(uint32_t **p, bl_reg rt, uint64_t imm)
+{
+    bl_gen_li(p, rt, extract64(imm, 32, 32));
+    bl_gen_dsll(p, rt, rt, 16);
+    bl_gen_ori(p, rt, rt, extract64(imm, 16, 16));
+    bl_gen_dsll(p, rt, rt, 16);
+    bl_gen_ori(p, rt, rt, extract64(imm, 0, 16));
+}
+
+static void bl_gen_load_ulong(uint32_t **p, bl_reg rt, target_ulong imm)
+{
+    if (bootcpu_supports_isa(ISA_MIPS3)) {
+        bl_gen_dli(p, rt, imm); /* 64bit */
+    } else {
+        bl_gen_li(p, rt, imm); /* 32bit */
+    }
+}
+
+/* Helpers */
+void bl_gen_jump_to(uint32_t **p, target_ulong jump_addr)
+{
+    bl_gen_load_ulong(p, BL_REG_T9, jump_addr);
+    bl_gen_jalr(p, BL_REG_T9);
+    bl_gen_nop(p); /* delay slot */
+}
+
+void bl_gen_jump_kernel(uint32_t **p, target_ulong sp, target_ulong a0,
+                        target_ulong a1, target_ulong a2, target_ulong a3,
+                        target_ulong kernel_addr)
+{
+    bl_gen_load_ulong(p, BL_REG_SP, sp);
+    bl_gen_load_ulong(p, BL_REG_A0, a0);
+    bl_gen_load_ulong(p, BL_REG_A1, a1);
+    bl_gen_load_ulong(p, BL_REG_A2, a2);
+    bl_gen_load_ulong(p, BL_REG_A3, a3);
+
+    bl_gen_jump_to(p, kernel_addr);
+}
+
+void bl_gen_write_ulong(uint32_t **p, target_ulong addr, target_ulong val)
+{
+    bl_gen_load_ulong(p, BL_REG_K0, val);
+    bl_gen_load_ulong(p, BL_REG_K1, addr);
+    bl_gen_sd(p, BL_REG_K0, BL_REG_K1, 0x0);
+}
+
+void bl_gen_write_u32(uint32_t **p, target_ulong addr, uint32_t val)
+{
+    bl_gen_li(p, BL_REG_K0, val);
+    bl_gen_load_ulong(p, BL_REG_K1, addr);
+    bl_gen_sw(p, BL_REG_K0, BL_REG_K1, 0x0);
+}
+
+void bl_gen_write_u64(uint32_t **p, target_ulong addr, uint64_t val)
+{
+    bl_gen_dli(p, BL_REG_K0, val);
+    bl_gen_load_ulong(p, BL_REG_K1, addr);
+    bl_gen_sd(p, BL_REG_K0, BL_REG_K1, 0x0);
+}
diff --git a/hw/mips/boston.c b/hw/mips/boston.c
index 467fbc1c8b..ac2e93a05a 100644
--- a/hw/mips/boston.c
+++ b/hw/mips/boston.c
@@ -27,6 +27,7 @@
 #include "hw/ide/ahci.h"
 #include "hw/loader.h"
 #include "hw/loader-fit.h"
+#include "hw/mips/bootloader.h"
 #include "hw/mips/cps.h"
 #include "hw/pci-host/xilinx-pcie.h"
 #include "hw/qdev-clock.h"
@@ -273,48 +274,26 @@ static void boston_register_types(void)
 }
 type_init(boston_register_types)
 
-static void gen_firmware(uint32_t *p, hwaddr kernel_entry, hwaddr fdt_addr,
-                         bool is_64b)
+static void gen_firmware(uint32_t *p, hwaddr kernel_entry, hwaddr fdt_addr)
 {
     const uint32_t cm_base = 0x16100000;
     const uint32_t gic_base = 0x16120000;
     const uint32_t cpc_base = 0x16200000;
 
     /* Move CM GCRs */
-    if (is_64b) {
-        stl_p(p++, 0x40287803);                 /* dmfc0 $8, CMGCRBase */
-        stl_p(p++, 0x00084138);                 /* dsll $8, $8, 4 */
-    } else {
-        stl_p(p++, 0x40087803);                 /* mfc0 $8, CMGCRBase */
-        stl_p(p++, 0x00084100);                 /* sll  $8, $8, 4 */
-    }
-    stl_p(p++, 0x3c09a000);                     /* lui  $9, 0xa000 */
-    stl_p(p++, 0x01094025);                     /* or   $8, $9 */
-    stl_p(p++, 0x3c0a0000 | (cm_base >> 16));   /* lui  $10, cm_base >> 16 */
-    if (is_64b) {
-        stl_p(p++, 0xfd0a0008);                 /* sd   $10, 0x8($8) */
-    } else {
-        stl_p(p++, 0xad0a0008);                 /* sw   $10, 0x8($8) */
-    }
-    stl_p(p++, 0x012a4025);                     /* or   $8, $10 */
+    bl_gen_write_ulong(&p,
+                       cpu_mips_phys_to_kseg1(NULL, GCR_BASE_ADDR + GCR_BASE_OFS),
+                       cm_base);
 
     /* Move & enable GIC GCRs */
-    stl_p(p++, 0x3c090000 | (gic_base >> 16));  /* lui  $9, gic_base >> 16 */
-    stl_p(p++, 0x35290001);                     /* ori  $9, 0x1 */
-    if (is_64b) {
-        stl_p(p++, 0xfd090080);                 /* sd   $9, 0x80($8) */
-    } else {
-        stl_p(p++, 0xad090080);                 /* sw   $9, 0x80($8) */
-    }
+    bl_gen_write_ulong(&p,
+                       cpu_mips_phys_to_kseg1(NULL, cm_base + GCR_GIC_BASE_OFS),
+                       gic_base | GCR_GIC_BASE_GICEN_MSK);
 
     /* Move & enable CPC GCRs */
-    stl_p(p++, 0x3c090000 | (cpc_base >> 16));  /* lui  $9, cpc_base >> 16 */
-    stl_p(p++, 0x35290001);                     /* ori  $9, 0x1 */
-    if (is_64b) {
-        stl_p(p++, 0xfd090088);                 /* sd   $9, 0x88($8) */
-    } else {
-        stl_p(p++, 0xad090088);                 /* sw   $9, 0x88($8) */
-    }
+    bl_gen_write_ulong(&p,
+                       cpu_mips_phys_to_kseg1(NULL, cm_base + GCR_CPC_BASE_OFS),
+                       cpc_base | GCR_CPC_BASE_CPCEN_MSK);
 
     /*
      * Setup argument registers to follow the UHI boot protocol:
@@ -324,21 +303,7 @@ static void gen_firmware(uint32_t *p, hwaddr kernel_entry, hwaddr fdt_addr,
      * a2/$6 = 0
      * a3/$7 = 0
      */
-    stl_p(p++, 0x2404fffe);                     /* li   $4, -2 */
-                                                /* lui  $5, hi(fdt_addr) */
-    stl_p(p++, 0x3c050000 | ((fdt_addr >> 16) & 0xffff));
-    if (fdt_addr & 0xffff) {                    /* ori  $5, lo(fdt_addr) */
-        stl_p(p++, 0x34a50000 | (fdt_addr & 0xffff));
-    }
-    stl_p(p++, 0x34060000);                     /* li   $6, 0 */
-    stl_p(p++, 0x34070000);                     /* li   $7, 0 */
-
-    /* Load kernel entry address & jump to it */
-                                                /* lui  $25, hi(kernel_entry) */
-    stl_p(p++, 0x3c190000 | ((kernel_entry >> 16) & 0xffff));
-                                                /* ori  $25, lo(kernel_entry) */
-    stl_p(p++, 0x37390000 | (kernel_entry & 0xffff));
-    stl_p(p++, 0x03200009);                     /* jr   $25 */
+    bl_gen_jump_kernel(&p, 0, (int32_t)-2, fdt_addr, 0, 0, kernel_entry);
 }
 
 static const void *boston_fdt_filter(void *opaque, const void *fdt_orig,
@@ -542,8 +507,7 @@ static void boston_mach_init(MachineState *machine)
         }
 
         gen_firmware(memory_region_get_ram_ptr(flash) + 0x7c00000,
-                     s->kernel_entry, s->fdt_base,
-                     cpu_type_is_64bit(machine->cpu_type));
+                     s->kernel_entry, s->fdt_base);
     } else if (!qtest_enabled()) {
         error_report("Please provide either a -kernel or -bios argument");
         exit(1);
diff --git a/hw/mips/fuloong2e.c b/hw/mips/fuloong2e.c
index bac2adbd5a..4f61f2c873 100644
--- a/hw/mips/fuloong2e.c
+++ b/hw/mips/fuloong2e.c
@@ -25,26 +25,24 @@
 #include "qapi/error.h"
 #include "cpu.h"
 #include "hw/clock.h"
-#include "hw/intc/i8259.h"
-#include "hw/dma/i8257.h"
-#include "hw/isa/superio.h"
 #include "net/net.h"
 #include "hw/boards.h"
 #include "hw/i2c/smbus_eeprom.h"
 #include "hw/block/flash.h"
 #include "hw/mips/mips.h"
+#include "hw/mips/bootloader.h"
 #include "hw/mips/cpudevs.h"
 #include "hw/pci/pci.h"
 #include "qemu/log.h"
 #include "hw/loader.h"
 #include "hw/ide/pci.h"
+#include "hw/qdev-properties.h"
 #include "elf.h"
 #include "hw/isa/vt82c686.h"
-#include "hw/rtc/mc146818rtc.h"
-#include "hw/timer/i8254.h"
 #include "exec/address-spaces.h"
 #include "sysemu/qtest.h"
 #include "sysemu/reset.h"
+#include "sysemu/sysemu.h"
 #include "qemu/error-report.h"
 
 #define ENVP_PADDR              0x2000
@@ -185,30 +183,8 @@ static void write_bootloader(CPUMIPSState *env, uint8_t *base,
     /* Second part of the bootloader */
     p = (uint32_t *)(base + 0x040);
 
-    /* lui a0, 0 */
-    stl_p(p++, 0x3c040000);
-    /* ori a0, a0, 2 */
-    stl_p(p++, 0x34840002);
-    /* lui a1, high(ENVP_VADDR) */
-    stl_p(p++, 0x3c050000 | ((ENVP_VADDR >> 16) & 0xffff));
-    /* ori a1, a0, low(ENVP_VADDR) */
-    stl_p(p++, 0x34a50000 | (ENVP_VADDR & 0xffff));
-    /* lui a2, high(ENVP_VADDR + 8) */
-    stl_p(p++, 0x3c060000 | (((ENVP_VADDR + 8) >> 16) & 0xffff));
-    /* ori a2, a2, low(ENVP_VADDR + 8) */
-    stl_p(p++, 0x34c60000 | ((ENVP_VADDR + 8) & 0xffff));
-    /* lui a3, high(env->ram_size) */
-    stl_p(p++, 0x3c070000 | (loaderparams.ram_size >> 16));
-    /* ori a3, a3, low(env->ram_size) */
-    stl_p(p++, 0x34e70000 | (loaderparams.ram_size & 0xffff));
-    /* lui ra, high(kernel_addr) */
-    stl_p(p++, 0x3c1f0000 | ((kernel_addr >> 16) & 0xffff));
-    /* ori ra, ra, low(kernel_addr) */
-    stl_p(p++, 0x37ff0000 | (kernel_addr & 0xffff));
-    /* jr ra */
-    stl_p(p++, 0x03e00008);
-    /* nop */
-    stl_p(p++, 0x00000000);
+    bl_gen_jump_kernel(&p, ENVP_VADDR - 64, 2, ENVP_VADDR, ENVP_VADDR + 8,
+                       loaderparams.ram_size, kernel_addr);
 }
 
 static void main_cpu_reset(void *opaque)
@@ -224,26 +200,13 @@ static void main_cpu_reset(void *opaque)
 }
 
 static void vt82c686b_southbridge_init(PCIBus *pci_bus, int slot, qemu_irq intc,
-                                       I2CBus **i2c_bus, ISABus **p_isa_bus)
+                                       I2CBus **i2c_bus)
 {
-    qemu_irq *i8259;
-    ISABus *isa_bus;
     PCIDevice *dev;
 
     dev = pci_create_simple_multifunction(pci_bus, PCI_DEVFN(slot, 0), true,
                                           TYPE_VT82C686B_ISA);
-    isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(dev), "isa.0"));
-    assert(isa_bus);
-    *p_isa_bus = isa_bus;
-    /* Interrupt controller */
-    /* The 8259 -> IP5  */
-    i8259 = i8259_init(isa_bus, intc);
-    isa_bus_irqs(isa_bus, i8259);
-    /* init other devices */
-    i8254_pit_init(isa_bus, 0x40, 0, NULL);
-    i8257_dma_init(isa_bus, 0);
-    /* Super I/O */
-    isa_create_simple(isa_bus, TYPE_VT82C686B_SUPERIO);
+    qdev_connect_gpio_out(DEVICE(dev), 0, intc);
 
     dev = pci_create_simple(pci_bus, PCI_DEVFN(slot, 1), "via-ide");
     pci_ide_create_devs(dev);
@@ -251,9 +214,7 @@ static void vt82c686b_southbridge_init(PCIBus *pci_bus, int slot, qemu_irq intc,
     pci_create_simple(pci_bus, PCI_DEVFN(slot, 2), "vt82c686b-usb-uhci");
     pci_create_simple(pci_bus, PCI_DEVFN(slot, 3), "vt82c686b-usb-uhci");
 
-    dev = pci_new(PCI_DEVFN(slot, 4), TYPE_VT82C686B_PM);
-    qdev_prop_set_uint32(DEVICE(dev), "smb_io_base", 0xeee1);
-    pci_realize_and_unref(dev, pci_bus, &error_fatal);
+    dev = pci_create_simple(pci_bus, PCI_DEVFN(slot, 4), TYPE_VT82C686B_PM);
     *i2c_bus = I2C_BUS(qdev_get_child_bus(DEVICE(dev), "i2c"));
 
     /* Audio support */
@@ -292,7 +253,6 @@ static void mips_fuloong2e_init(MachineState *machine)
     uint64_t kernel_entry;
     PCIDevice *pci_dev;
     PCIBus *pci_bus;
-    ISABus *isa_bus;
     I2CBus *smbus;
     Clock *cpuclk;
     MIPSCPU *cpu;
@@ -359,7 +319,7 @@ static void mips_fuloong2e_init(MachineState *machine)
 
     /* South bridge -> IP5 */
     vt82c686b_southbridge_init(pci_bus, FULOONG2E_VIA_SLOT, env->irq[5],
-                               &smbus, &isa_bus);
+                               &smbus);
 
     /* GPU */
     if (vga_interface_type != VGA_NONE) {
@@ -374,8 +334,6 @@ static void mips_fuloong2e_init(MachineState *machine)
     spd_data = spd_data_generate(DDR, machine->ram_size);
     smbus_eeprom_init_one(smbus, 0x50, spd_data);
 
-    mc146818_rtc_init(isa_bus, 2000, NULL);
-
     /* Network card: RTL8139D */
     network_init(pci_bus);
 }
diff --git a/hw/mips/loongson3_bootp.h b/hw/mips/loongson3_bootp.h
index 09f8480abf..d525ab745a 100644
--- a/hw/mips/loongson3_bootp.h
+++ b/hw/mips/loongson3_bootp.h
@@ -228,12 +228,7 @@ enum {
     LOADER_PARAM,
 };
 
-struct MemmapEntry {
-    hwaddr base;
-    hwaddr size;
-};
-
-extern const struct MemmapEntry virt_memmap[];
+extern const MemMapEntry virt_memmap[];
 void init_loongson_params(struct loongson_params *lp, void *p,
                           uint64_t cpu_freq, uint64_t ram_size);
 void init_reset_system(struct efi_reset_system_t *reset);
diff --git a/hw/mips/loongson3_virt.c b/hw/mips/loongson3_virt.c
index d4a82fa536..b15071defc 100644
--- a/hw/mips/loongson3_virt.c
+++ b/hw/mips/loongson3_virt.c
@@ -72,7 +72,7 @@
 #define RTC_IRQ             1
 #define PCIE_IRQ_BASE       2
 
-const struct MemmapEntry virt_memmap[] = {
+const MemMapEntry virt_memmap[] = {
     [VIRT_LOWMEM] =      { 0x00000000,    0x10000000 },
     [VIRT_PM] =          { 0x10080000,         0x100 },
     [VIRT_FW_CFG] =      { 0x10080100,         0x100 },
@@ -86,13 +86,13 @@ const struct MemmapEntry virt_memmap[] = {
     [VIRT_HIGHMEM] =     { 0x80000000,           0x0 }, /* Variable */
 };
 
-static const struct MemmapEntry loader_memmap[] = {
+static const MemMapEntry loader_memmap[] = {
     [LOADER_KERNEL] =    { 0x00000000,     0x4000000 },
     [LOADER_INITRD] =    { 0x04000000,           0x0 }, /* Variable */
     [LOADER_CMDLINE] =   { 0x0ff00000,      0x100000 },
 };
 
-static const struct MemmapEntry loader_rommap[] = {
+static const MemMapEntry loader_rommap[] = {
     [LOADER_BOOTROM] =   { 0x1fc00000,        0x1000 },
     [LOADER_PARAM] =     { 0x1fc01000,       0x10000 },
 };
diff --git a/hw/mips/meson.build b/hw/mips/meson.build
index ee19cc204d..1195716dc7 100644
--- a/hw/mips/meson.build
+++ b/hw/mips/meson.build
@@ -1,5 +1,5 @@
 mips_ss = ss.source_set()
-mips_ss.add(files('mips_int.c'))
+mips_ss.add(files('bootloader.c', 'mips_int.c'))
 mips_ss.add(when: 'CONFIG_FW_CFG_MIPS', if_true: files('fw_cfg.c'))
 mips_ss.add(when: 'CONFIG_FULOONG', if_true: files('fuloong2e.c'))
 mips_ss.add(when: 'CONFIG_LOONGSON3V', if_true: files('loongson3_bootp.c', 'loongson3_virt.c'))
diff --git a/include/hw/isa/vt82c686.h b/include/hw/isa/vt82c686.h
index 5b0a1ffe72..9b6d610e83 100644
--- a/include/hw/isa/vt82c686.h
+++ b/include/hw/isa/vt82c686.h
@@ -4,6 +4,7 @@
 #define TYPE_VT82C686B_ISA "vt82c686b-isa"
 #define TYPE_VT82C686B_SUPERIO "vt82c686b-superio"
 #define TYPE_VT82C686B_PM "vt82c686b-pm"
+#define TYPE_VT8231_PM "vt8231-pm"
 #define TYPE_VIA_AC97 "via-ac97"
 #define TYPE_VIA_MC97 "via-mc97"
 
diff --git a/include/hw/mips/bootloader.h b/include/hw/mips/bootloader.h
new file mode 100644
index 0000000000..b5f48d71bb
--- /dev/null
+++ b/include/hw/mips/bootloader.h
@@ -0,0 +1,22 @@
+/*
+ * Utility for QEMU MIPS to generate it's simple bootloader
+ *
+ * Copyright (C) 2020 Jiaxun Yang <jiaxun.yang@flygoat.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef HW_MIPS_BOOTLOADER_H
+#define HW_MIPS_BOOTLOADER_H
+
+#include "exec/cpu-defs.h"
+
+void bl_gen_jump_to(uint32_t **p, target_ulong jump_addr);
+void bl_gen_jump_kernel(uint32_t **p, target_ulong sp, target_ulong a0,
+                        target_ulong a1, target_ulong a2, target_ulong a3,
+                        target_ulong kernel_addr);
+void bl_gen_write_ulong(uint32_t **p, target_ulong addr, target_ulong val);
+void bl_gen_write_u32(uint32_t **p, target_ulong addr, uint32_t val);
+void bl_gen_write_u64(uint32_t **p, target_ulong addr, uint64_t val);
+
+#endif
diff --git a/include/hw/pci/pci_ids.h b/include/hw/pci/pci_ids.h
index bd0c17dc78..ea28dcc850 100644
--- a/include/hw/pci/pci_ids.h
+++ b/include/hw/pci/pci_ids.h
@@ -207,9 +207,10 @@
 #define PCI_DEVICE_ID_VIA_ISA_BRIDGE     0x0686
 #define PCI_DEVICE_ID_VIA_IDE            0x0571
 #define PCI_DEVICE_ID_VIA_UHCI           0x3038
-#define PCI_DEVICE_ID_VIA_ACPI           0x3057
+#define PCI_DEVICE_ID_VIA_82C686B_PM     0x3057
 #define PCI_DEVICE_ID_VIA_AC97           0x3058
 #define PCI_DEVICE_ID_VIA_MC97           0x3068
+#define PCI_DEVICE_ID_VIA_8231_PM        0x8235
 
 #define PCI_VENDOR_ID_MARVELL            0x11ab
 
diff --git a/target/mips/cpu.h b/target/mips/cpu.h
index b9e227a30e..075c24abda 100644
--- a/target/mips/cpu.h
+++ b/target/mips/cpu.h
@@ -460,6 +460,13 @@ typedef struct mips_def_t mips_def_t;
 typedef struct TCState TCState;
 struct TCState {
     target_ulong gpr[32];
+#if defined(TARGET_MIPS64)
+    /*
+     * For CPUs using 128-bit GPR registers, we put the lower halves in gpr[])
+     * and the upper halves in gpr_hi[].
+     */
+    uint64_t gpr_hi[32];
+#endif /* TARGET_MIPS64 */
     target_ulong PC;
     target_ulong HI[MIPS_DSP_ACC];
     target_ulong LO[MIPS_DSP_ACC];
@@ -505,9 +512,6 @@ struct TCState {
 
     float_status msa_fp_status;
 
-    /* Upper 64-bit MMRs (multimedia registers); the lower 64-bit are GPRs */
-    uint64_t mmr[32];
-
 #define NUMBER_OF_MXU_REGISTERS 16
     target_ulong mxu_gpr[NUMBER_OF_MXU_REGISTERS - 1];
     target_ulong mxu_cr;
@@ -1220,22 +1224,6 @@ typedef MIPSCPU ArchCPU;
 
 #include "exec/cpu-all.h"
 
-/*
- * Memory access type :
- * may be needed for precise access rights control and precise exceptions.
- */
-enum {
-    /* 1 bit to define user level / supervisor access */
-    ACCESS_USER  = 0x00,
-    ACCESS_SUPER = 0x01,
-    /* 1 bit to indicate direction */
-    ACCESS_STORE = 0x02,
-    /* Type of instruction that generated the access */
-    ACCESS_CODE  = 0x10, /* Code fetch access                */
-    ACCESS_INT   = 0x20, /* Integer load/store access        */
-    ACCESS_FLOAT = 0x30, /* floating point load/store access */
-};
-
 /* Exceptions */
 enum {
     EXCP_NONE          = -1,
diff --git a/target/mips/internal.h b/target/mips/internal.h
index 5dd17ff733..99264b8bf6 100644
--- a/target/mips/internal.h
+++ b/target/mips/internal.h
@@ -111,7 +111,7 @@ struct CPUMIPSTLBContext {
     uint32_t nb_tlb;
     uint32_t tlb_in_use;
     int (*map_address)(struct CPUMIPSState *env, hwaddr *physical, int *prot,
-                       target_ulong address, int rw, int access_type);
+                       target_ulong address, MMUAccessType access_type);
     void (*helper_tlbwi)(struct CPUMIPSState *env);
     void (*helper_tlbwr)(struct CPUMIPSState *env);
     void (*helper_tlbp)(struct CPUMIPSState *env);
@@ -126,11 +126,11 @@ struct CPUMIPSTLBContext {
 };
 
 int no_mmu_map_address(CPUMIPSState *env, hwaddr *physical, int *prot,
-                       target_ulong address, int rw, int access_type);
+                       target_ulong address, MMUAccessType access_type);
 int fixed_mmu_map_address(CPUMIPSState *env, hwaddr *physical, int *prot,
-                          target_ulong address, int rw, int access_type);
+                          target_ulong address, MMUAccessType access_type);
 int r4k_map_address(CPUMIPSState *env, hwaddr *physical, int *prot,
-                    target_ulong address, int rw, int access_type);
+                    target_ulong address, MMUAccessType access_type);
 void r4k_helper_tlbwi(CPUMIPSState *env);
 void r4k_helper_tlbwr(CPUMIPSState *env);
 void r4k_helper_tlbp(CPUMIPSState *env);
@@ -146,7 +146,7 @@ void mips_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
                                     int mmu_idx, MemTxAttrs attrs,
                                     MemTxResult response, uintptr_t retaddr);
 hwaddr cpu_mips_translate_address(CPUMIPSState *env, target_ulong address,
-                                  int rw);
+                                  MMUAccessType access_type);
 #endif
 
 #define cpu_signal_handler cpu_mips_signal_handler
diff --git a/target/mips/msa_helper.c b/target/mips/msa_helper.c
index 1298a1917c..4caefe29ad 100644
--- a/target/mips/msa_helper.c
+++ b/target/mips/msa_helper.c
@@ -20,6 +20,7 @@
 #include "qemu/osdep.h"
 #include "cpu.h"
 #include "internal.h"
+#include "tcg/tcg.h"
 #include "exec/exec-all.h"
 #include "exec/helper-proto.h"
 #include "exec/memop.h"
diff --git a/target/mips/op_helper.c b/target/mips/op_helper.c
index 89c7d4556a..b80e8f7540 100644
--- a/target/mips/op_helper.c
+++ b/target/mips/op_helper.c
@@ -288,13 +288,14 @@ target_ulong helper_rotx(target_ulong rs, uint32_t shift, uint32_t shiftx,
 #ifndef CONFIG_USER_ONLY
 
 static inline hwaddr do_translate_address(CPUMIPSState *env,
-                                                      target_ulong address,
-                                                      int rw, uintptr_t retaddr)
+                                          target_ulong address,
+                                          MMUAccessType access_type,
+                                          uintptr_t retaddr)
 {
     hwaddr paddr;
     CPUState *cs = env_cpu(env);
 
-    paddr = cpu_mips_translate_address(env, address, rw);
+    paddr = cpu_mips_translate_address(env, address, access_type);
 
     if (paddr == -1LL) {
         cpu_loop_exit_restore(cs, retaddr);
@@ -312,7 +313,7 @@ target_ulong helper_##name(CPUMIPSState *env, target_ulong arg, int mem_idx)  \
         }                                                                     \
         do_raise_exception(env, EXCP_AdEL, GETPC());                          \
     }                                                                         \
-    env->CP0_LLAddr = do_translate_address(env, arg, 0, GETPC());             \
+    env->CP0_LLAddr = do_translate_address(env, arg, MMU_DATA_LOAD, GETPC()); \
     env->lladdr = arg;                                                        \
     env->llval = do_cast cpu_##insn##_mmuidx_ra(env, arg, mem_idx, GETPC());  \
     return env->llval;                                                        \
diff --git a/target/mips/tlb_helper.c b/target/mips/tlb_helper.c
index 082c17928d..8d3ea49780 100644
--- a/target/mips/tlb_helper.c
+++ b/target/mips/tlb_helper.c
@@ -39,7 +39,7 @@ enum {
 
 /* no MMU emulation */
 int no_mmu_map_address(CPUMIPSState *env, hwaddr *physical, int *prot,
-                       target_ulong address, int rw, int access_type)
+                       target_ulong address, MMUAccessType access_type)
 {
     *physical = address;
     *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
@@ -48,7 +48,7 @@ int no_mmu_map_address(CPUMIPSState *env, hwaddr *physical, int *prot,
 
 /* fixed mapping MMU emulation */
 int fixed_mmu_map_address(CPUMIPSState *env, hwaddr *physical, int *prot,
-                          target_ulong address, int rw, int access_type)
+                          target_ulong address, MMUAccessType access_type)
 {
     if (address <= (int32_t)0x7FFFFFFFUL) {
         if (!(env->CP0_Status & (1 << CP0St_ERL))) {
@@ -68,7 +68,7 @@ int fixed_mmu_map_address(CPUMIPSState *env, hwaddr *physical, int *prot,
 
 /* MIPS32/MIPS64 R4000-style MMU emulation */
 int r4k_map_address(CPUMIPSState *env, hwaddr *physical, int *prot,
-                    target_ulong address, int rw, int access_type)
+                    target_ulong address, MMUAccessType access_type)
 {
     uint16_t ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask;
     uint32_t MMID = env->CP0_MemoryMapID;
@@ -97,13 +97,13 @@ int r4k_map_address(CPUMIPSState *env, hwaddr *physical, int *prot,
             if (!(n ? tlb->V1 : tlb->V0)) {
                 return TLBRET_INVALID;
             }
-            if (rw == MMU_INST_FETCH && (n ? tlb->XI1 : tlb->XI0)) {
+            if (access_type == MMU_INST_FETCH && (n ? tlb->XI1 : tlb->XI0)) {
                 return TLBRET_XI;
             }
-            if (rw == MMU_DATA_LOAD && (n ? tlb->RI1 : tlb->RI0)) {
+            if (access_type == MMU_DATA_LOAD && (n ? tlb->RI1 : tlb->RI0)) {
                 return TLBRET_RI;
             }
-            if (rw != MMU_DATA_STORE || (n ? tlb->D1 : tlb->D0)) {
+            if (access_type != MMU_DATA_STORE || (n ? tlb->D1 : tlb->D0)) {
                 *physical = tlb->PFN[n] | (address & (mask >> 1));
                 *prot = PAGE_READ;
                 if (n ? tlb->D1 : tlb->D0) {
@@ -222,7 +222,7 @@ static int is_seg_am_mapped(unsigned int am, bool eu, int mmu_idx)
 
 static int get_seg_physical_address(CPUMIPSState *env, hwaddr *physical,
                                     int *prot, target_ulong real_address,
-                                    int rw, int access_type, int mmu_idx,
+                                    MMUAccessType access_type, int mmu_idx,
                                     unsigned int am, bool eu,
                                     target_ulong segmask,
                                     hwaddr physical_base)
@@ -234,7 +234,7 @@ static int get_seg_physical_address(CPUMIPSState *env, hwaddr *physical,
         return mapped;
     } else if (mapped) {
         /* The segment is TLB mapped */
-        return env->tlb->map_address(env, physical, prot, real_address, rw,
+        return env->tlb->map_address(env, physical, prot, real_address,
                                      access_type);
     } else {
         /* The segment is unmapped */
@@ -246,21 +246,21 @@ static int get_seg_physical_address(CPUMIPSState *env, hwaddr *physical,
 
 static int get_segctl_physical_address(CPUMIPSState *env, hwaddr *physical,
                                        int *prot, target_ulong real_address,
-                                       int rw, int access_type, int mmu_idx,
+                                       MMUAccessType access_type, int mmu_idx,
                                        uint16_t segctl, target_ulong segmask)
 {
     unsigned int am = (segctl & CP0SC_AM_MASK) >> CP0SC_AM;
     bool eu = (segctl >> CP0SC_EU) & 1;
     hwaddr pa = ((hwaddr)segctl & CP0SC_PA_MASK) << 20;
 
-    return get_seg_physical_address(env, physical, prot, real_address, rw,
+    return get_seg_physical_address(env, physical, prot, real_address,
                                     access_type, mmu_idx, am, eu, segmask,
                                     pa & ~(hwaddr)segmask);
 }
 
 static int get_physical_address(CPUMIPSState *env, hwaddr *physical,
                                 int *prot, target_ulong real_address,
-                                int rw, int access_type, int mmu_idx)
+                                MMUAccessType access_type, int mmu_idx)
 {
     /* User mode can only access useg/xuseg */
 #if defined(TARGET_MIPS64)
@@ -307,14 +307,14 @@ static int get_physical_address(CPUMIPSState *env, hwaddr *physical,
             segctl = env->CP0_SegCtl2 >> 16;
         }
         ret = get_segctl_physical_address(env, physical, prot,
-                                          real_address, rw, access_type,
+                                          real_address, access_type,
                                           mmu_idx, segctl, 0x3FFFFFFF);
 #if defined(TARGET_MIPS64)
     } else if (address < 0x4000000000000000ULL) {
         /* xuseg */
         if (UX && address <= (0x3FFFFFFFFFFFFFFFULL & env->SEGMask)) {
             ret = env->tlb->map_address(env, physical, prot,
-                                        real_address, rw, access_type);
+                                        real_address, access_type);
         } else {
             ret = TLBRET_BADADDR;
         }
@@ -323,7 +323,7 @@ static int get_physical_address(CPUMIPSState *env, hwaddr *physical,
         if ((supervisor_mode || kernel_mode) &&
             SX && address <= (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) {
             ret = env->tlb->map_address(env, physical, prot,
-                                        real_address, rw, access_type);
+                                        real_address, access_type);
         } else {
             ret = TLBRET_BADADDR;
         }
@@ -350,7 +350,7 @@ static int get_physical_address(CPUMIPSState *env, hwaddr *physical,
             /* Does CP0_Status.KX/SX/UX permit the access mode (am) */
             if (env->CP0_Status & am_ksux[am]) {
                 ret = get_seg_physical_address(env, physical, prot,
-                                               real_address, rw, access_type,
+                                               real_address, access_type,
                                                mmu_idx, am, false, env->PAMask,
                                                0);
             } else {
@@ -364,24 +364,24 @@ static int get_physical_address(CPUMIPSState *env, hwaddr *physical,
         if (kernel_mode && KX &&
             address <= (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) {
             ret = env->tlb->map_address(env, physical, prot,
-                                        real_address, rw, access_type);
+                                        real_address, access_type);
         } else {
             ret = TLBRET_BADADDR;
         }
 #endif
     } else if (address < KSEG1_BASE) {
         /* kseg0 */
-        ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
+        ret = get_segctl_physical_address(env, physical, prot, real_address,
                                           access_type, mmu_idx,
                                           env->CP0_SegCtl1 >> 16, 0x1FFFFFFF);
     } else if (address < KSEG2_BASE) {
         /* kseg1 */
-        ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
+        ret = get_segctl_physical_address(env, physical, prot, real_address,
                                           access_type, mmu_idx,
                                           env->CP0_SegCtl1, 0x1FFFFFFF);
     } else if (address < KSEG3_BASE) {
         /* sseg (kseg2) */
-        ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
+        ret = get_segctl_physical_address(env, physical, prot, real_address,
                                           access_type, mmu_idx,
                                           env->CP0_SegCtl0 >> 16, 0x1FFFFFFF);
     } else {
@@ -389,7 +389,7 @@ static int get_physical_address(CPUMIPSState *env, hwaddr *physical,
          * kseg3
          * XXX: debug segment is not emulated
          */
-        ret = get_segctl_physical_address(env, physical, prot, real_address, rw,
+        ret = get_segctl_physical_address(env, physical, prot, real_address,
                                           access_type, mmu_idx,
                                           env->CP0_SegCtl0, 0x1FFFFFFF);
     }
@@ -406,12 +406,12 @@ void cpu_mips_tlb_flush(CPUMIPSState *env)
 #endif /* !CONFIG_USER_ONLY */
 
 static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
-                                int rw, int tlb_error)
+                                MMUAccessType access_type, int tlb_error)
 {
     CPUState *cs = env_cpu(env);
     int exception = 0, error_code = 0;
 
-    if (rw == MMU_INST_FETCH) {
+    if (access_type == MMU_INST_FETCH) {
         error_code |= EXCP_INST_NOTAVAIL;
     }
 
@@ -420,7 +420,7 @@ static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
     case TLBRET_BADADDR:
         /* Reference to kernel address from user mode or supervisor mode */
         /* Reference to supervisor address from user mode */
-        if (rw == MMU_DATA_STORE) {
+        if (access_type == MMU_DATA_STORE) {
             exception = EXCP_AdES;
         } else {
             exception = EXCP_AdEL;
@@ -428,7 +428,7 @@ static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
         break;
     case TLBRET_NOMATCH:
         /* No TLB match for a mapped address */
-        if (rw == MMU_DATA_STORE) {
+        if (access_type == MMU_DATA_STORE) {
             exception = EXCP_TLBS;
         } else {
             exception = EXCP_TLBL;
@@ -437,7 +437,7 @@ static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
         break;
     case TLBRET_INVALID:
         /* TLB match with no valid bit */
-        if (rw == MMU_DATA_STORE) {
+        if (access_type == MMU_DATA_STORE) {
             exception = EXCP_TLBS;
         } else {
             exception = EXCP_TLBL;
@@ -493,7 +493,7 @@ hwaddr mips_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
     hwaddr phys_addr;
     int prot;
 
-    if (get_physical_address(env, &phys_addr, &prot, addr, 0, ACCESS_INT,
+    if (get_physical_address(env, &phys_addr, &prot, addr, MMU_DATA_LOAD,
                              cpu_mmu_index(env, false)) != 0) {
         return -1;
     }
@@ -571,7 +571,7 @@ static int walk_directory(CPUMIPSState *env, uint64_t *vaddr,
     uint64_t w = 0;
 
     if (get_physical_address(env, &paddr, &prot, *vaddr, MMU_DATA_LOAD,
-                             ACCESS_INT, cpu_mmu_index(env, false)) !=
+                             cpu_mmu_index(env, false)) !=
                              TLBRET_MATCH) {
         /* wrong base address */
         return 0;
@@ -599,7 +599,7 @@ static int walk_directory(CPUMIPSState *env, uint64_t *vaddr,
                 *pw_entrylo0 = entry;
             }
             if (get_physical_address(env, &paddr, &prot, vaddr2, MMU_DATA_LOAD,
-                                     ACCESS_INT, cpu_mmu_index(env, false)) !=
+                                     cpu_mmu_index(env, false)) !=
                                      TLBRET_MATCH) {
                 return 0;
             }
@@ -622,8 +622,8 @@ static int walk_directory(CPUMIPSState *env, uint64_t *vaddr,
     }
 }
 
-static bool page_table_walk_refill(CPUMIPSState *env, vaddr address, int rw,
-        int mmu_idx)
+static bool page_table_walk_refill(CPUMIPSState *env, vaddr address,
+                                   int mmu_idx)
 {
     int gdw = (env->CP0_PWSize >> CP0PS_GDW) & 0x3F;
     int udw = (env->CP0_PWSize >> CP0PS_UDW) & 0x3F;
@@ -753,7 +753,7 @@ static bool page_table_walk_refill(CPUMIPSState *env, vaddr address, int rw,
     /* Leaf Level Page Table - First half of PTE pair */
     vaddr |= ptoffset0;
     if (get_physical_address(env, &paddr, &prot, vaddr, MMU_DATA_LOAD,
-                             ACCESS_INT, cpu_mmu_index(env, false)) !=
+                             cpu_mmu_index(env, false)) !=
                              TLBRET_MATCH) {
         return false;
     }
@@ -766,7 +766,7 @@ static bool page_table_walk_refill(CPUMIPSState *env, vaddr address, int rw,
     /* Leaf Level Page Table - Second half of PTE pair */
     vaddr |= ptoffset1;
     if (get_physical_address(env, &paddr, &prot, vaddr, MMU_DATA_LOAD,
-                             ACCESS_INT, cpu_mmu_index(env, false)) !=
+                             cpu_mmu_index(env, false)) !=
                              TLBRET_MATCH) {
         return false;
     }
@@ -844,16 +844,14 @@ bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 #if !defined(CONFIG_USER_ONLY)
     hwaddr physical;
     int prot;
-    int mips_access_type;
 #endif
     int ret = TLBRET_BADADDR;
 
     /* data access */
 #if !defined(CONFIG_USER_ONLY)
     /* XXX: put correct access by using cpu_restore_state() correctly */
-    mips_access_type = ACCESS_INT;
     ret = get_physical_address(env, &physical, &prot, address,
-                               access_type, mips_access_type, mmu_idx);
+                               access_type, mmu_idx);
     switch (ret) {
     case TLBRET_MATCH:
         qemu_log_mask(CPU_LOG_MMU,
@@ -881,11 +879,11 @@ bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
         int mode = (env->hflags & MIPS_HFLAG_KSU);
         bool ret_walker;
         env->hflags &= ~MIPS_HFLAG_KSU;
-        ret_walker = page_table_walk_refill(env, address, access_type, mmu_idx);
+        ret_walker = page_table_walk_refill(env, address, mmu_idx);
         env->hflags |= mode;
         if (ret_walker) {
             ret = get_physical_address(env, &physical, &prot, address,
-                                       access_type, mips_access_type, mmu_idx);
+                                       access_type, mmu_idx);
             if (ret == TLBRET_MATCH) {
                 tlb_set_page(cs, address & TARGET_PAGE_MASK,
                              physical & TARGET_PAGE_MASK, prot,
@@ -906,19 +904,17 @@ bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 
 #ifndef CONFIG_USER_ONLY
 hwaddr cpu_mips_translate_address(CPUMIPSState *env, target_ulong address,
-                                  int rw)
+                                  MMUAccessType access_type)
 {
     hwaddr physical;
     int prot;
-    int access_type;
     int ret = 0;
 
     /* data access */
-    access_type = ACCESS_INT;
-    ret = get_physical_address(env, &physical, &prot, address, rw, access_type,
+    ret = get_physical_address(env, &physical, &prot, address, access_type,
                                cpu_mmu_index(env, false));
     if (ret != TLBRET_MATCH) {
-        raise_mmu_exception(env, address, rw, ret);
+        raise_mmu_exception(env, address, access_type, ret);
         return -1LL;
     } else {
         return physical;
diff --git a/target/mips/translate.c b/target/mips/translate.c
index a5cf1742a8..70891c37cd 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -26,7 +26,7 @@
 #include "cpu.h"
 #include "internal.h"
 #include "tcg/tcg-op.h"
-#include "exec/cpu_ldst.h"
+#include "exec/translator.h"
 #include "exec/helper-proto.h"
 #include "exec/helper-gen.h"
 #include "hw/semihosting/semihost.h"
@@ -2179,7 +2179,12 @@ enum {
 
 /* global register indices */
 TCGv cpu_gpr[32], cpu_PC;
-static TCGv cpu_HI[MIPS_DSP_ACC], cpu_LO[MIPS_DSP_ACC];
+/*
+ * For CPUs using 128-bit GPR registers, we put the lower halves in cpu_gpr[])
+ * and the upper halves in cpu_gpr_hi[].
+ */
+TCGv_i64 cpu_gpr_hi[32];
+TCGv cpu_HI[MIPS_DSP_ACC], cpu_LO[MIPS_DSP_ACC];
 static TCGv cpu_dspctrl, btarget;
 TCGv bcond;
 static TCGv cpu_lladdr, cpu_llval;
@@ -2187,11 +2192,6 @@ static TCGv_i32 hflags;
 TCGv_i32 fpu_fcr0, fpu_fcr31;
 TCGv_i64 fpu_f64[32];
 
-#if defined(TARGET_MIPS64)
-/* Upper halves of R5900's 128-bit registers: MMRs (multimedia registers) */
-static TCGv_i64 cpu_mmr[32];
-#endif
-
 #if !defined(TARGET_MIPS64)
 /* MXU registers */
 static TCGv mxu_gpr[NUMBER_OF_MXU_REGISTERS - 1];
@@ -2291,6 +2291,24 @@ void gen_store_gpr(TCGv t, int reg)
     }
 }
 
+#if defined(TARGET_MIPS64)
+void gen_load_gpr_hi(TCGv_i64 t, int reg)
+{
+    if (reg == 0) {
+        tcg_gen_movi_i64(t, 0);
+    } else {
+        tcg_gen_mov_i64(t, cpu_gpr_hi[reg]);
+    }
+}
+
+void gen_store_gpr_hi(TCGv_i64 t, int reg)
+{
+    if (reg != 0) {
+        tcg_gen_mov_i64(cpu_gpr_hi[reg], t);
+    }
+}
+#endif /* TARGET_MIPS64 */
+
 /* Moves to/from shadow registers. */
 static inline void gen_load_srsgpr(int from, int to)
 {
@@ -4108,31 +4126,18 @@ static void gen_shift(DisasContext *ctx, uint32_t opc,
 /* Copy GPR to and from TX79 HI1/LO1 register. */
 static void gen_HILO1_tx79(DisasContext *ctx, uint32_t opc, int reg)
 {
-    if (reg == 0 && (opc == MMI_OPC_MFHI1 || opc == MMI_OPC_MFLO1)) {
-        /* Treat as NOP. */
-        return;
-    }
-
     switch (opc) {
     case MMI_OPC_MFHI1:
-        tcg_gen_mov_tl(cpu_gpr[reg], cpu_HI[1]);
+        gen_store_gpr(cpu_HI[1], reg);
         break;
     case MMI_OPC_MFLO1:
-        tcg_gen_mov_tl(cpu_gpr[reg], cpu_LO[1]);
+        gen_store_gpr(cpu_LO[1], reg);
         break;
     case MMI_OPC_MTHI1:
-        if (reg != 0) {
-            tcg_gen_mov_tl(cpu_HI[1], cpu_gpr[reg]);
-        } else {
-            tcg_gen_movi_tl(cpu_HI[1], 0);
-        }
+        gen_load_gpr(cpu_HI[1], reg);
         break;
     case MMI_OPC_MTLO1:
-        if (reg != 0) {
-            tcg_gen_mov_tl(cpu_LO[1], cpu_gpr[reg]);
-        } else {
-            tcg_gen_movi_tl(cpu_LO[1], 0);
-        }
+        gen_load_gpr(cpu_LO[1], reg);
         break;
     default:
         MIPS_INVAL("mfthilo1 TX79");
@@ -13911,7 +13916,7 @@ static void decode_i64_mips16(DisasContext *ctx,
 
 static int decode_extended_mips16_opc(CPUMIPSState *env, DisasContext *ctx)
 {
-    int extend = cpu_lduw_code(env, ctx->base.pc_next + 2);
+    int extend = translator_lduw(env, ctx->base.pc_next + 2);
     int op, rx, ry, funct, sa;
     int16_t imm, offset;
 
@@ -14161,7 +14166,7 @@ static int decode_mips16_opc(CPUMIPSState *env, DisasContext *ctx)
         /* No delay slot, so just process as a normal instruction */
         break;
     case M16_OPC_JAL:
-        offset = cpu_lduw_code(env, ctx->base.pc_next + 2);
+        offset = translator_lduw(env, ctx->base.pc_next + 2);
         offset = (((ctx->opcode & 0x1f) << 21)
                   | ((ctx->opcode >> 5) & 0x1f) << 16
                   | offset) << 2;
@@ -16295,7 +16300,7 @@ static void decode_micromips32_opc(CPUMIPSState *env, DisasContext *ctx)
     uint32_t op, minor, minor2, mips32_op;
     uint32_t cond, fmt, cc;
 
-    insn = cpu_lduw_code(env, ctx->base.pc_next + 2);
+    insn = translator_lduw(env, ctx->base.pc_next + 2);
     ctx->opcode = (ctx->opcode << 16) | insn;
 
     rt = (ctx->opcode >> 21) & 0x1f;
@@ -21350,7 +21355,7 @@ static int decode_nanomips_32_48_opc(CPUMIPSState *env, DisasContext *ctx)
     int offset;
     int imm;
 
-    insn = cpu_lduw_code(env, ctx->base.pc_next + 2);
+    insn = translator_lduw(env, ctx->base.pc_next + 2);
     ctx->opcode = (ctx->opcode << 16) | insn;
 
     rt = extract32(ctx->opcode, 21, 5);
@@ -21469,7 +21474,7 @@ static int decode_nanomips_32_48_opc(CPUMIPSState *env, DisasContext *ctx)
         break;
     case NM_P48I:
         {
-            insn = cpu_lduw_code(env, ctx->base.pc_next + 4);
+            insn = translator_lduw(env, ctx->base.pc_next + 4);
             target_long addr_off = extract32(ctx->opcode, 0, 16) | insn << 16;
             switch (extract32(ctx->opcode, 16, 5)) {
             case NM_LI48:
@@ -24784,7 +24789,7 @@ static void gen_mmi_pcpyh(DisasContext *ctx)
         /* nop */
     } else if (rt == 0) {
         tcg_gen_movi_i64(cpu_gpr[rd], 0);
-        tcg_gen_movi_i64(cpu_mmr[rd], 0);
+        tcg_gen_movi_i64(cpu_gpr_hi[rd], 0);
     } else {
         TCGv_i64 t0 = tcg_temp_new();
         TCGv_i64 t1 = tcg_temp_new();
@@ -24802,7 +24807,7 @@ static void gen_mmi_pcpyh(DisasContext *ctx)
 
         tcg_gen_mov_i64(cpu_gpr[rd], t1);
 
-        tcg_gen_andi_i64(t0, cpu_mmr[rt], mask);
+        tcg_gen_andi_i64(t0, cpu_gpr_hi[rt], mask);
         tcg_gen_movi_i64(t1, 0);
         tcg_gen_or_i64(t1, t0, t1);
         tcg_gen_shli_i64(t0, t0, 16);
@@ -24812,7 +24817,7 @@ static void gen_mmi_pcpyh(DisasContext *ctx)
         tcg_gen_shli_i64(t0, t0, 16);
         tcg_gen_or_i64(t1, t0, t1);
 
-        tcg_gen_mov_i64(cpu_mmr[rd], t1);
+        tcg_gen_mov_i64(cpu_gpr_hi[rd], t1);
 
         tcg_temp_free(t0);
         tcg_temp_free(t1);
@@ -24844,9 +24849,9 @@ static void gen_mmi_pcpyld(DisasContext *ctx)
         /* nop */
     } else {
         if (rs == 0) {
-            tcg_gen_movi_i64(cpu_mmr[rd], 0);
+            tcg_gen_movi_i64(cpu_gpr_hi[rd], 0);
         } else {
-            tcg_gen_mov_i64(cpu_mmr[rd], cpu_gpr[rs]);
+            tcg_gen_mov_i64(cpu_gpr_hi[rd], cpu_gpr[rs]);
         }
         if (rt == 0) {
             tcg_gen_movi_i64(cpu_gpr[rd], 0);
@@ -24885,13 +24890,13 @@ static void gen_mmi_pcpyud(DisasContext *ctx)
         if (rs == 0) {
             tcg_gen_movi_i64(cpu_gpr[rd], 0);
         } else {
-            tcg_gen_mov_i64(cpu_gpr[rd], cpu_mmr[rs]);
+            tcg_gen_mov_i64(cpu_gpr[rd], cpu_gpr_hi[rs]);
         }
         if (rt == 0) {
-            tcg_gen_movi_i64(cpu_mmr[rd], 0);
+            tcg_gen_movi_i64(cpu_gpr_hi[rd], 0);
         } else {
             if (rd != rt) {
-                tcg_gen_mov_i64(cpu_mmr[rd], cpu_mmr[rt]);
+                tcg_gen_mov_i64(cpu_gpr_hi[rd], cpu_gpr_hi[rt]);
             }
         }
     }
@@ -29087,17 +29092,17 @@ static void mips_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
 
     is_slot = ctx->hflags & MIPS_HFLAG_BMASK;
     if (ctx->insn_flags & ISA_NANOMIPS32) {
-        ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next);
+        ctx->opcode = translator_lduw(env, ctx->base.pc_next);
         insn_bytes = decode_nanomips_opc(env, ctx);
     } else if (!(ctx->hflags & MIPS_HFLAG_M16)) {
-        ctx->opcode = cpu_ldl_code(env, ctx->base.pc_next);
+        ctx->opcode = translator_ldl(env, ctx->base.pc_next);
         insn_bytes = 4;
         decode_opc(env, ctx);
     } else if (ctx->insn_flags & ASE_MICROMIPS) {
-        ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next);
+        ctx->opcode = translator_lduw(env, ctx->base.pc_next);
         insn_bytes = decode_micromips_opc(env, ctx);
     } else if (ctx->insn_flags & ASE_MIPS16) {
-        ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next);
+        ctx->opcode = translator_lduw(env, ctx->base.pc_next);
         insn_bytes = decode_mips16_opc(env, ctx);
     } else {
         gen_reserved_instruction(ctx);
@@ -29285,6 +29290,18 @@ void mips_tcg_init(void)
                                         offsetof(CPUMIPSState,
                                                  active_tc.gpr[i]),
                                         regnames[i]);
+#if defined(TARGET_MIPS64)
+    cpu_gpr_hi[0] = NULL;
+
+    for (unsigned i = 1; i < 32; i++) {
+        g_autofree char *rname = g_strdup_printf("%s[hi]", regnames[i]);
+
+        cpu_gpr_hi[i] = tcg_global_mem_new_i64(cpu_env,
+                                               offsetof(CPUMIPSState,
+                                                        active_tc.gpr_hi[i]),
+                                               rname);
+    }
+#endif /* !TARGET_MIPS64 */
     for (i = 0; i < 32; i++) {
         int off = offsetof(CPUMIPSState, active_fpu.fpr[i].wr.d[0]);
 
@@ -29323,16 +29340,6 @@ void mips_tcg_init(void)
     cpu_llval = tcg_global_mem_new(cpu_env, offsetof(CPUMIPSState, llval),
                                    "llval");
 
-#if defined(TARGET_MIPS64)
-    cpu_mmr[0] = NULL;
-    for (i = 1; i < 32; i++) {
-        cpu_mmr[i] = tcg_global_mem_new_i64(cpu_env,
-                                            offsetof(CPUMIPSState,
-                                                     active_tc.mmr[i]),
-                                            regnames[i]);
-    }
-#endif
-
 #if !defined(TARGET_MIPS64)
     for (i = 0; i < NUMBER_OF_MXU_REGISTERS - 1; i++) {
         mxu_gpr[i] = tcg_global_mem_new(cpu_env,
@@ -29344,7 +29351,7 @@ void mips_tcg_init(void)
     mxu_CR = tcg_global_mem_new(cpu_env,
                                 offsetof(CPUMIPSState, active_tc.mxu_cr),
                                 mxuregnames[NUMBER_OF_MXU_REGISTERS - 1]);
-#endif
+#endif /* !TARGET_MIPS64 */
 }
 
 void restore_state_to_opc(CPUMIPSState *env, TranslationBlock *tb,
diff --git a/target/mips/translate.h b/target/mips/translate.h
index f47b5f2c8d..468e29d757 100644
--- a/target/mips/translate.h
+++ b/target/mips/translate.h
@@ -131,6 +131,10 @@ void gen_move_low32(TCGv ret, TCGv_i64 arg);
 void gen_move_high32(TCGv ret, TCGv_i64 arg);
 void gen_load_gpr(TCGv t, int reg);
 void gen_store_gpr(TCGv t, int reg);
+#if defined(TARGET_MIPS64)
+void gen_load_gpr_hi(TCGv_i64 t, int reg);
+void gen_store_gpr_hi(TCGv_i64 t, int reg);
+#endif /* TARGET_MIPS64 */
 void gen_load_fpr32(DisasContext *ctx, TCGv_i32 t, int reg);
 void gen_load_fpr64(DisasContext *ctx, TCGv_i64 t, int reg);
 void gen_store_fpr32(DisasContext *ctx, TCGv_i32 t, int reg);
@@ -145,6 +149,10 @@ bool gen_lsa(DisasContext *ctx, int rd, int rt, int rs, int sa);
 bool gen_dlsa(DisasContext *ctx, int rd, int rt, int rs, int sa);
 
 extern TCGv cpu_gpr[32], cpu_PC;
+#if defined(TARGET_MIPS64)
+extern TCGv_i64 cpu_gpr_hi[32];
+#endif
+extern TCGv cpu_HI[MIPS_DSP_ACC], cpu_LO[MIPS_DSP_ACC];
 extern TCGv_i32 fpu_fcr0, fpu_fcr31;
 extern TCGv_i64 fpu_f64[32];
 extern TCGv bcond;
diff --git a/tests/acceptance/machine_mips_loongson3v.py b/tests/acceptance/machine_mips_loongson3v.py
new file mode 100644
index 0000000000..85b131a40f
--- /dev/null
+++ b/tests/acceptance/machine_mips_loongson3v.py
@@ -0,0 +1,39 @@
+# Functional tests for the Generic Loongson-3 Platform.
+#
+# Copyright (c) 2021 Jiaxun Yang <jiaxun.yang@flygoat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+import os
+import time
+
+from avocado import skipUnless
+from avocado_qemu import Test
+from avocado_qemu import wait_for_console_pattern
+
+class MipsLoongson3v(Test):
+    timeout = 60
+
+    @skipUnless(os.getenv('AVOCADO_ALLOW_UNTRUSTED_CODE'), 'untrusted code')
+    def test_pmon_serial_console(self):
+        """
+        :avocado: tags=arch:mips64el
+        :avocado: tags=endian:little
+        :avocado: tags=machine:loongson3-virt
+        :avocado: tags=cpu:Loongson-3A1000
+        :avocado: tags=device:liointc
+        :avocado: tags=device:goldfish_rtc
+        """
+
+        pmon_hash = '7c8b45dd81ccfc55ff28f5aa267a41c3'
+        pmon_path = self.fetch_asset('https://github.com/loongson-community/pmon/'
+                                    'releases/download/20210112/pmon-3avirt.bin',
+                                     asset_hash=pmon_hash, algorithm='md5')
+
+        self.vm.set_console()
+        self.vm.add_args('-bios', pmon_path)
+        self.vm.launch()
+        wait_for_console_pattern(self, 'CPU GODSON3 BogoMIPS:')