[Qemu-devel] [PATCH 0/4] qdev: add isa bus support

[Qemu-devel] [PATCH 0/4] qdev: add isa bus support

[Gerd Hoffmann]

  Hi,

This series adds isa bus support to qdev and converts one device
(pc kbd controller).

cheers,
  Gerd

[Qemu-devel] [PATCH 1/4] qdev/isa: add isa bus support to qdev.

[Gerd Hoffmann]

Wrong mmio stuff from previous version ripped out.
Pretty simple and straigt forward now.
IRQs modeled simliar to sysbus.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 Makefile.target |    8 +++---
 hw/isa-bus.c    |   82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/isa.h        |   25 +++++++++++++++++
 3 files changed, 111 insertions(+), 4 deletions(-)
 create mode 100644 hw/isa-bus.c

diff --git a/Makefile.target b/Makefile.target
index 1a71f3a..3395dee 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -563,7 +563,7 @@ obj-y += wdt_ib700.o wdt_i6300esb.o
 
 ifeq ($(TARGET_BASE_ARCH), i386)
 # Hardware support
-obj-y += ide.o pckbd.o vga.o $(sound-obj-y) dma.o
+obj-y += ide.o pckbd.o vga.o $(sound-obj-y) dma.o isa-bus.o
 obj-y += fdc.o mc146818rtc.o serial.o i8259.o i8254.o pcspk.o pc.o
 obj-y += cirrus_vga.o apic.o ioapic.o parallel.o acpi.o piix_pci.o
 obj-y += usb-uhci.o vmmouse.o vmport.o vmware_vga.o hpet.o
@@ -573,7 +573,7 @@ endif
 ifeq ($(TARGET_BASE_ARCH), ppc)
 CPPFLAGS += -DHAS_AUDIO -DHAS_AUDIO_CHOICE
 # shared objects
-obj-y += ppc.o ide.o vga.o $(sound-obj-y) dma.o openpic.o
+obj-y += ppc.o ide.o vga.o $(sound-obj-y) dma.o isa-bus.o openpic.o
 # PREP target
 obj-y += pckbd.o serial.o i8259.o i8254.o fdc.o mc146818rtc.o
 obj-y += prep_pci.o ppc_prep.o
@@ -599,7 +599,7 @@ obj-y += mips_r4k.o mips_jazz.o mips_malta.o mips_mipssim.o
 obj-y += mips_timer.o mips_int.o dma.o vga.o serial.o i8254.o i8259.o rc4030.o
 obj-y += g364fb.o jazz_led.o dp8393x.o
 obj-y += ide.o gt64xxx.o pckbd.o fdc.o mc146818rtc.o usb-uhci.o acpi.o ds1225y.o
-obj-y += piix_pci.o parallel.o cirrus_vga.o pcspk.o $(sound-obj-y)
+obj-y += piix_pci.o parallel.o cirrus_vga.o isa-bus.o pcspk.o $(sound-obj-y)
 obj-y += mipsnet.o
 obj-y += pflash_cfi01.o
 obj-y += vmware_vga.o
@@ -635,7 +635,7 @@ obj-y += pflash_cfi02.o
 endif
 ifeq ($(TARGET_BASE_ARCH), sparc)
 ifeq ($(TARGET_ARCH), sparc64)
-obj-y += sun4u.o ide.o pckbd.o vga.o apb_pci.o
+obj-y += sun4u.o ide.o isa-bus.o pckbd.o vga.o apb_pci.o
 obj-y += fdc.o mc146818rtc.o serial.o
 obj-y += cirrus_vga.o parallel.o
 else
diff --git a/hw/isa-bus.c b/hw/isa-bus.c
new file mode 100644
index 0000000..c0a6447
--- /dev/null
+++ b/hw/isa-bus.c
@@ -0,0 +1,82 @@
+#include "hw.h"
+#include "sysemu.h"
+#include "isa.h"
+
+struct ISABus {
+    BusState qbus;
+};
+static ISABus *isabus;
+
+static struct BusInfo isa_bus_info = {
+    .name  = "ISA",
+    .size  = sizeof(ISABus),
+    .props = (Property[]) {
+        {
+            .name   = "iobase",
+            .info   = &qdev_prop_hex32,
+            .offset = offsetof(ISADevice, iobase[0]),
+            .defval = (uint32_t[]) { -1 },
+        },{
+            .name   = "iobase2",
+            .info   = &qdev_prop_hex32,
+            .offset = offsetof(ISADevice, iobase[1]),
+            .defval = (uint32_t[]) { -1 },
+        },
+        {/* end of list */}
+    }
+};
+
+ISABus *isa_bus_new(DeviceState *dev)
+{
+    if (isabus) {
+        fprintf(stderr, "Can't create a second ISA bus\n");
+        return NULL;
+    }
+
+    isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));
+    return isabus;
+}
+
+void isa_connect_irq(ISADevice *dev, int n, qemu_irq irq)
+{
+    assert(n >= 0 && n < dev->nirqs);
+    if (dev->irqs[n])
+        *dev->irqs[n] = irq;
+}
+
+void isa_init_irq(ISADevice *dev, qemu_irq *p)
+{
+    assert(dev->nirqs < ARRAY_SIZE(dev->irqs));
+    dev->irqs[dev->nirqs] = p;
+    dev->nirqs++;
+}
+
+static void isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
+{
+    ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
+    ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
+
+    info->init(dev);
+}
+
+void isa_qdev_register(ISADeviceInfo *info)
+{
+    info->qdev.init = isa_qdev_init;
+    info->qdev.bus_info = &isa_bus_info;
+    qdev_register(&info->qdev);
+}
+
+ISADevice *isa_create_simple(const char *name, uint32_t iobase, uint32_t iobase2)
+{
+    DeviceState *dev;
+    ISADevice *isa;
+
+    if (!isabus)
+        return NULL;
+    dev = qdev_create(&isabus->qbus, name);
+    isa = DO_UPCAST(ISADevice, qdev, dev);
+    isa->iobase[0] = iobase;
+    isa->iobase[1] = iobase2;
+    qdev_init(dev);
+    return isa;
+}
diff --git a/hw/isa.h b/hw/isa.h
index f126ecc..49c58f8 100644
--- a/hw/isa.h
+++ b/hw/isa.h
@@ -1,8 +1,33 @@
 #ifndef HW_ISA_H
 #define HW_ISA_H
+
 /* ISA bus */
 
 #include "ioport.h"
+#include "qdev.h"
+
+typedef struct ISABus ISABus;
+typedef struct ISADevice ISADevice;
+typedef struct ISADeviceInfo ISADeviceInfo;
+
+struct ISADevice {
+    DeviceState qdev;
+    uint32_t iobase[2];
+    qemu_irq *irqs[2];
+    int nirqs;
+};
+
+typedef void (*isa_qdev_initfn)(ISADevice *dev);
+struct ISADeviceInfo {
+    DeviceInfo qdev;
+    isa_qdev_initfn init;
+};
+
+ISABus *isa_bus_new(DeviceState *dev);
+void isa_connect_irq(ISADevice *dev, int n, qemu_irq irq);
+void isa_init_irq(ISADevice *dev, qemu_irq *p);
+void isa_qdev_register(ISADeviceInfo *info);
+ISADevice *isa_create_simple(const char *name, uint32_t iobase, uint32_t iobase2);
 
 extern target_phys_addr_t isa_mem_base;
 
-- 
1.6.2.5

Re: [Qemu-devel] [PATCH 1/4] qdev/isa: add isa bus support to qdev.

[Filip Navara]

2009/7/15 Gerd Hoffmann <kraxel@redhat.com>:
> +static struct BusInfo isa_bus_info = {
> +    .name  = "ISA",
> +    .size  = sizeof(ISABus),
> +    .props = (Property[]) {
> +        {
> +            .name   = "iobase",
> +            .info   = &qdev_prop_hex32,
> +            .offset = offsetof(ISADevice, iobase[0]),
> +            .defval = (uint32_t[]) { -1 },
> +        },{
> +            .name   = "iobase2",
> +            .info   = &qdev_prop_hex32,
> +            .offset = offsetof(ISADevice, iobase[1]),
> +            .defval = (uint32_t[]) { -1 },
> +        },
> +        {/* end of list */}
> +    }
> +};

Why exactly two IO bases? That sounds like bad design to me. IMHO it
should be handled more like sysbus_init_mmio (or sysbus_init_mmio_cb)
and sysbus_mmio_map and the number of IO bases should be virtually
unlimited (something like QDEV_MAX_MMIO is acceptable).

Best regards,
Filip Navara

Re: [Qemu-devel] [PATCH 1/4] qdev/isa: add isa bus support to qdev.

[Gerd Hoffmann]

On 07/17/09 20:12, Filip Navara wrote:
> 2009/7/15 Gerd Hoffmann<kraxel@redhat.com>:
>> +static struct BusInfo isa_bus_info = {
>> +    .name  = "ISA",
>> +    .size  = sizeof(ISABus),
>> +    .props = (Property[]) {
>> +        {
>> +            .name   = "iobase",
>> +            .name   = "iobase2",
>
> Why exactly two IO bases? That sounds like bad design to me. IMHO it
> should be handled more like sysbus_init_mmio (or sysbus_init_mmio_cb)
> and sysbus_mmio_map and the number of IO bases should be virtually
> unlimited (something like QDEV_MAX_MMIO is acceptable).

Do we really need that?  As new isa devices most likely wouldn't show up 
looking at the existing ones should give us a pretty complete picture ;)

Most devices use one iobase.  A few (ide, ps/2) need two.  Any devices 
which need more?

cheers,
   Gerd

[Qemu-devel] [PATCH 2/4] qdev/isa: add qdev support to i8042 (aka ps/2 kbd+mouse).

[Gerd Hoffmann]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/pckbd.c |   40 ++++++++++++++++++++++++++++++++++++++++
 1 files changed, 40 insertions(+), 0 deletions(-)

diff --git a/hw/pckbd.c b/hw/pckbd.c
index d50cd6e..bb4cc0e 100644
--- a/hw/pckbd.c
+++ b/hw/pckbd.c
@@ -440,3 +440,43 @@ void i8042_mm_init(qemu_irq kbd_irq, qemu_irq mouse_irq,
 #endif
     qemu_register_reset(kbd_reset, s);
 }
+
+typedef struct ISAKBDState {
+    ISADevice dev;
+    KBDState  kbd;
+} ISAKBDState;
+
+static void i8042_initfn(ISADevice *dev)
+{
+    KBDState *s = &(DO_UPCAST(ISAKBDState, dev, dev)->kbd);
+
+    isa_init_irq(dev, &s->irq_kbd);
+    isa_init_irq(dev, &s->irq_mouse);
+
+    kbd_reset(s);
+    register_savevm("pckbd", 0, 3, kbd_save, kbd_load, s);
+    register_ioport_read(dev->iobase[0], 1, 1, kbd_read_data, s);
+    register_ioport_write(dev->iobase[0], 1, 1, kbd_write_data, s);
+    register_ioport_read(dev->iobase[1], 1, 1, kbd_read_status, s);
+    register_ioport_write(dev->iobase[1], 1, 1, kbd_write_command, s);
+
+    s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
+    s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
+#ifdef TARGET_I386
+    vmmouse_init(s->mouse);
+#endif
+    qemu_register_reset(kbd_reset, s);
+}
+
+static ISADeviceInfo i8042_info = {
+    .qdev.name     = "i8042",
+    .qdev.size     = sizeof(ISAKBDState),
+    .qdev.no_user  = 1,
+    .init          = i8042_initfn,
+};
+
+static void i8042_register(void)
+{
+    isa_qdev_register(&i8042_info);
+}
+device_init(i8042_register)
-- 
1.6.2.5

[Qemu-devel] [PATCH 3/4] qdev/isa: make the piix isa bridge register an isa bus.

[Gerd Hoffmann]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/piix_pci.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/hw/piix_pci.c b/hw/piix_pci.c
index 91cebc9..c4f304b 100644
--- a/hw/piix_pci.c
+++ b/hw/piix_pci.c
@@ -25,6 +25,7 @@
 #include "hw.h"
 #include "pc.h"
 #include "pci.h"
+#include "isa.h"
 #include "sysbus.h"
 
 typedef uint32_t pci_addr_t;
@@ -342,6 +343,7 @@ static void piix3_initfn(PCIDevice *d)
 {
     uint8_t *pci_conf;
 
+    isa_bus_new(&d->qdev);
     register_savevm("PIIX3", 0, 2, piix_save, piix_load, d);
 
     pci_conf = d->config;
-- 
1.6.2.5

[Qemu-devel] [PATCH 4/4] qdev/isa: make pc use qdev for i8042 setup.

[Gerd Hoffmann]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/pc.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c
index 8be1277..0dd03df 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -1095,6 +1095,7 @@ static void pc_init1(ram_addr_t ram_size,
     int bios_size, isa_bios_size, oprom_area_size;
     PCIBus *pci_bus;
     PCIDevice *pci_dev;
+    ISADevice *isa_dev;
     int piix3_devfn = -1;
     CPUState *env;
     qemu_irq *cpu_irq;
@@ -1344,7 +1345,9 @@ static void pc_init1(ram_addr_t ram_size,
         }
     }
 
-    i8042_init(i8259[1], i8259[12], 0x60);
+    isa_dev = isa_create_simple("i8042", 0x60, 0x64);
+    isa_connect_irq(isa_dev, 0, i8259[1]);
+    isa_connect_irq(isa_dev, 1, i8259[12]);
     DMA_init(0);
 #ifdef HAS_AUDIO
     audio_init(pci_enabled ? pci_bus : NULL, i8259);
-- 
1.6.2.5

[Qemu-devel] [PATCH 0/4] qdev: isa bus.

[Gerd Hoffmann]

  Hi,

This is a proof-of-concept / RfC patch series to add isa bus support to
qdev.  It adds isa-bus.c and converts one user (pc keyboard+mouse).

I've tried to also handle isa-via-mmio used by certain architectures and
hide that in isa-bus.c, so the individual drivers don't have to care
once everything is converted over to qdev.

Reviews especially from people knowing non-pc archs better than I do are
very welcome.

thanks,
  Gerd

[Qemu-devel] [PATCH 1/4] qdev/isa: add isa bus support to qdev.

[Gerd Hoffmann]

The implementation tries to cover both the pc-ish ioport case and the
mmio-based isa port access found in other architectures.  The common
code in isa-bus.c handles mmio internally, so the separate init path for
mmio present in many drivers can go away once all users are switched
over to qdev.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 Makefile.target |    8 +-
 hw/isa-bus.c    |  216 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/isa.h        |   31 ++++++++
 3 files changed, 251 insertions(+), 4 deletions(-)
 create mode 100644 hw/isa-bus.c

diff --git a/Makefile.target b/Makefile.target
index a593503..1a865fa 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -562,7 +562,7 @@ obj-y += wdt_ib700.o wdt_i6300esb.o
 
 ifeq ($(TARGET_BASE_ARCH), i386)
 # Hardware support
-obj-y += ide.o pckbd.o vga.o $(sound-obj-y) dma.o
+obj-y += ide.o pckbd.o vga.o $(sound-obj-y) dma.o isa-bus.o
 obj-y += fdc.o mc146818rtc.o serial.o i8259.o i8254.o pcspk.o pc.o
 obj-y += cirrus_vga.o apic.o ioapic.o parallel.o acpi.o piix_pci.o
 obj-y += usb-uhci.o vmmouse.o vmport.o vmware_vga.o hpet.o
@@ -572,7 +572,7 @@ endif
 ifeq ($(TARGET_BASE_ARCH), ppc)
 CPPFLAGS += -DHAS_AUDIO -DHAS_AUDIO_CHOICE
 # shared objects
-obj-y += ppc.o ide.o vga.o $(sound-obj-y) dma.o openpic.o
+obj-y += ppc.o ide.o vga.o $(sound-obj-y) dma.o isa-bus.o openpic.o
 # PREP target
 obj-y += pckbd.o serial.o i8259.o i8254.o fdc.o mc146818rtc.o
 obj-y += prep_pci.o ppc_prep.o
@@ -598,7 +598,7 @@ obj-y += mips_r4k.o mips_jazz.o mips_malta.o mips_mipssim.o
 obj-y += mips_timer.o mips_int.o dma.o vga.o serial.o i8254.o i8259.o rc4030.o
 obj-y += g364fb.o jazz_led.o dp8393x.o
 obj-y += ide.o gt64xxx.o pckbd.o fdc.o mc146818rtc.o usb-uhci.o acpi.o ds1225y.o
-obj-y += piix_pci.o parallel.o cirrus_vga.o pcspk.o $(sound-obj-y)
+obj-y += piix_pci.o parallel.o cirrus_vga.o isa-bus.o pcspk.o $(sound-obj-y)
 obj-y += mipsnet.o
 obj-y += pflash_cfi01.o
 obj-y += vmware_vga.o
@@ -634,7 +634,7 @@ obj-y += pflash_cfi02.o
 endif
 ifeq ($(TARGET_BASE_ARCH), sparc)
 ifeq ($(TARGET_ARCH), sparc64)
-obj-y += sun4u.o ide.o pckbd.o vga.o apb_pci.o
+obj-y += sun4u.o ide.o isa-bus.o pckbd.o vga.o apb_pci.o
 obj-y += fdc.o mc146818rtc.o serial.o
 obj-y += cirrus_vga.o parallel.o
 else
diff --git a/hw/isa-bus.c b/hw/isa-bus.c
new file mode 100644
index 0000000..96f95a9
--- /dev/null
+++ b/hw/isa-bus.c
@@ -0,0 +1,216 @@
+#include "hw.h"
+#include "sysemu.h"
+#include "isa.h"
+
+typedef struct ISAMMIO {
+    ISADevice     *dev;
+    ISADeviceInfo *info;
+    int           region;
+    int           io_memory;
+} ISAMMIO;
+
+struct ISABus {
+    BusState qbus;
+    int mmio;
+    int it_shift;
+};
+static ISABus *isabus;
+
+static struct BusInfo isa_bus_info = {
+    .name  = "ISA",
+    .size  = sizeof(ISABus),
+    .props = (Property[]) {
+        {
+            .name   = "iobase",
+            .info   = &qdev_prop_hex32,
+            .offset = offsetof(ISADevice, iobase[0]),
+            .defval = (uint32_t[]) { -1 },
+        },{
+            .name   = "iobase2",
+            .info   = &qdev_prop_hex32,
+            .offset = offsetof(ISADevice, iobase[1]),
+            .defval = (uint32_t[]) { -1 },
+        },
+        {/* end of list */}
+    }
+};
+
+ISABus *isa_bus_new(DeviceState *dev, int mmio, int it_shift)
+{
+    if (isabus) {
+        fprintf(stderr, "Can't create a second ISA bus\n");
+        return NULL;
+    }
+
+    isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, "isa"));
+    isabus->mmio = mmio;
+    isabus->it_shift = it_shift;
+    return isabus;
+}
+
+void isa_connect_irq(ISADevice *dev, int n, qemu_irq irq)
+{
+    assert(n >= 0 && n < dev->nirqs);
+    if (dev->irqs[n])
+        *dev->irqs[n] = irq;
+}
+
+void isa_init_irq(ISADevice *dev, qemu_irq *p)
+{
+    assert(dev->nirqs < ARRAY_SIZE(dev->irqs));
+    dev->irqs[dev->nirqs] = p;
+    dev->nirqs++;
+}
+
+static uint32_t isa_mm_readb(void *opaque, target_phys_addr_t addr)
+{
+    ISAMMIO *mm = opaque;
+    IOPortReadFunc *ioread = mm->info->io[mm->region].read;
+
+    return ioread(mm->dev, addr >> isabus->it_shift) & 0xFF;
+}
+
+static void isa_mm_writeb(void *opaque,
+                          target_phys_addr_t addr, uint32_t value)
+{
+    ISAMMIO *mm = opaque;
+    IOPortWriteFunc *iowrite = mm->info->io[mm->region].write;
+
+    iowrite(mm->dev, addr >> isabus->it_shift, value & 0xFF);
+}
+
+static uint32_t isa_mm_readw(void *opaque, target_phys_addr_t addr)
+{
+    ISAMMIO *mm = opaque;
+    IOPortReadFunc *ioread = mm->info->io[mm->region].read;
+    uint32_t value;
+
+    value = ioread(mm->dev, addr >> isabus->it_shift) & 0xFFFF;
+#ifdef TARGET_WORDS_BIGENDIAN
+    value = bswap16(value);
+#endif
+    return value;
+}
+
+static void isa_mm_writew(void *opaque,
+                       target_phys_addr_t addr, uint32_t value)
+{
+    ISAMMIO *mm = opaque;
+    IOPortWriteFunc *iowrite = mm->info->io[mm->region].write;
+
+#ifdef TARGET_WORDS_BIGENDIAN
+    value = bswap16(value);
+#endif
+    iowrite(mm->dev, addr >> isabus->it_shift, value & 0xFFFF);
+}
+
+static uint32_t isa_mm_readl(void *opaque, target_phys_addr_t addr)
+{
+    ISAMMIO *mm = opaque;
+    IOPortReadFunc *ioread = mm->info->io[mm->region].read;
+    uint32_t value;
+
+    value = ioread(mm->dev, addr >> isabus->it_shift);
+#ifdef TARGET_WORDS_BIGENDIAN
+    value = bswap32(value);
+#endif
+    return value;
+}
+
+static void isa_mm_writel(void *opaque,
+                          target_phys_addr_t addr, uint32_t value)
+{
+    ISAMMIO *mm = opaque;
+    IOPortWriteFunc *iowrite = mm->info->io[mm->region].write;
+
+#ifdef TARGET_WORDS_BIGENDIAN
+    value = bswap32(value);
+#endif
+    iowrite(mm->dev, addr >> isabus->it_shift, value & 0xFFFF);
+}
+
+static CPUReadMemoryFunc *isa_mm_read[] = {
+    &isa_mm_readb,
+    &isa_mm_readw,
+    &isa_mm_readl,
+};
+
+static CPUWriteMemoryFunc *isa_mm_write[] = {
+    &isa_mm_writeb,
+    &isa_mm_writew,
+    &isa_mm_writel,
+};
+
+static void isa_setup_ioport(ISADevice *dev, ISADeviceInfo *info)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(dev->iobase); i++) {
+        if (!dev->iobase[i])
+            continue;
+        if (info->io[i].read)
+            register_ioport_read(dev->iobase[i], info->io[i].length, 1,
+                                 info->io[i].read, dev);
+        if (info->io[i].write)
+            register_ioport_write(dev->iobase[i], info->io[i].length, 1,
+                                  info->io[i].write, dev);
+        fprintf(stderr, "%s: ioport 0x%x (+%d) %c%c for %s\n", __FUNCTION__,
+                dev->iobase[i], info->io[i].length,
+                info->io[i].read  ? 'r' : '-',
+                info->io[i].write ? 'w' : '-',
+                info->qdev.name);
+    }
+}
+
+static void isa_setup_mmio(ISADevice *dev, ISADeviceInfo *info)
+{
+    struct ISAMMIO *mm;
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(dev->iobase); i++) {
+        if (!dev->iobase[i])
+            continue;
+        mm = qemu_mallocz(sizeof(*mm));
+        mm->dev = dev;
+        mm->info = info;
+        mm->region = i;
+        mm->io_memory = cpu_register_io_memory(isa_mm_read, isa_mm_write, mm);
+        cpu_register_physical_memory(dev->iobase[i], info->io[i].length, mm->io_memory);
+     }
+}
+
+static void isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
+{
+    ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
+    ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
+
+    if (isabus->mmio) {
+        isa_setup_mmio(dev, info);
+    } else {
+        isa_setup_ioport(dev, info);
+    }
+
+    info->init(dev);
+}
+
+void isa_qdev_register(ISADeviceInfo *info)
+{
+    info->qdev.init = isa_qdev_init;
+    info->qdev.bus_info = &isa_bus_info;
+    qdev_register(&info->qdev);
+}
+
+ISADevice *isa_create_simple(const char *name, uint32_t iobase, uint32_t iobase2)
+{
+    DeviceState *dev;
+    ISADevice *isa;
+
+    if (!isabus)
+        return NULL;
+    dev = qdev_create(&isabus->qbus, name);
+    isa = DO_UPCAST(ISADevice, qdev, dev);
+    isa->iobase[0] = iobase;
+    isa->iobase[1] = iobase2;
+    qdev_init(dev);
+    return isa;
+}
diff --git a/hw/isa.h b/hw/isa.h
index a8c1a56..941bfe3 100644
--- a/hw/isa.h
+++ b/hw/isa.h
@@ -1,7 +1,38 @@
 #ifndef HW_ISA_H
 #define HW_ISA_H
+
 /* ISA bus */
 
+#include "qdev.h"
+
+typedef struct ISABus ISABus;
+typedef struct ISADevice ISADevice;
+typedef struct ISADeviceInfo ISADeviceInfo;
+
+struct ISADevice {
+    DeviceState qdev;
+    uint32_t iobase[2];
+    qemu_irq *irqs[2];
+    int nirqs;
+};
+
+typedef void (*isa_qdev_initfn)(ISADevice *dev);
+struct ISADeviceInfo {
+    DeviceInfo qdev;
+    isa_qdev_initfn init;
+    struct {
+        IOPortReadFunc  *read;
+        IOPortWriteFunc *write;
+        uint32_t        length;
+    } io[2];
+};
+
+ISABus *isa_bus_new(DeviceState *dev, int mmio, int it_shift);
+void isa_connect_irq(ISADevice *dev, int n, qemu_irq irq);
+void isa_init_irq(ISADevice *dev, qemu_irq *p);
+void isa_qdev_register(ISADeviceInfo *info);
+ISADevice *isa_create_simple(const char *name, uint32_t iobase, uint32_t iobase2);
+
 extern target_phys_addr_t isa_mem_base;
 
 int register_ioport_read(int start, int length, int size,
-- 
1.6.2.5