diff --git a/hw/ide.h b/hw/ide.h
index 08bebb4..e0a508b 100644
--- a/hw/ide.h
+++ b/hw/ide.h
@@ -10,10 +10,8 @@
 /* ide-pci.c */
 void pci_cmd646_ide_init(PCIBus *bus, DriveInfo **hd_table,
                          int secondary_ide_enabled);
-void pci_piix3_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn,
-                        qemu_irq *pic);
-void pci_piix4_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn,
-                        qemu_irq *pic);
+void pci_piix3_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn);
+void pci_piix4_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn);
 
 /* ide-macio.c */
 int pmac_ide_init (DriveInfo **hd_table, qemu_irq irq,
diff --git a/hw/ide/pci.c b/hw/ide/pci.c
index 0e8583a..607472b 100644
--- a/hw/ide/pci.c
+++ b/hw/ide/pci.c
@@ -443,8 +443,7 @@
 
 /* hd_table must contain 4 block drivers */
 /* NOTE: for the PIIX3, the IRQs and IOports are hardcoded */
-void pci_piix3_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn,
-                        qemu_irq *pic)
+void pci_piix3_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn)
 {
     PCIIDEState *d;
     uint8_t *pci_conf;
@@ -479,8 +478,7 @@
 
 /* hd_table must contain 4 block drivers */
 /* NOTE: for the PIIX4, the IRQs and IOports are hardcoded */
-void pci_piix4_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn,
-                        qemu_irq *pic)
+void pci_piix4_ide_init(PCIBus *bus, DriveInfo **hd_table, int devfn)
 {
     PCIIDEState *d;
     uint8_t *pci_conf;
@@ -505,11 +503,8 @@
     pci_register_bar((PCIDevice *)d, 4, 0x10,
                            PCI_ADDRESS_SPACE_IO, bmdma_map);
 
-    /*
-     * These should call isa_reserve_irq() instead when MIPS supports it
-     */
-    ide_init2(&d->bus[0], hd_table[0], hd_table[1], pic[14]);
-    ide_init2(&d->bus[1], hd_table[2], hd_table[3], pic[15]);
+    ide_init2(&d->bus[0], hd_table[0], hd_table[1], isa_reserve_irq(14));
+    ide_init2(&d->bus[1], hd_table[2], hd_table[3], isa_reserve_irq(15));
     ide_init_ioport(&d->bus[0], 0x1f0, 0x3f6);
     ide_init_ioport(&d->bus[1], 0x170, 0x376);
 
diff --git a/hw/mips_malta.c b/hw/mips_malta.c
index 275f72c..bb6364b 100644
--- a/hw/mips_malta.c
+++ b/hw/mips_malta.c
@@ -765,6 +765,7 @@
     target_long bios_size;
     int64_t kernel_entry;
     PCIBus *pci_bus;
+    ISADevice *isa_dev;
     CPUState *env;
     RTCState *rtc_state;
     fdctrl_t *floppy_controller;
@@ -903,9 +904,10 @@
     }
 
     piix4_devfn = piix4_init(pci_bus, 80);
-    pci_piix4_ide_init(pci_bus, hd, piix4_devfn + 1, i8259);
+    isa_bus_irqs(i8259);
+    pci_piix4_ide_init(pci_bus, hd, piix4_devfn + 1);
     usb_uhci_piix4_init(pci_bus, piix4_devfn + 2);
-    smbus = piix4_pm_init(pci_bus, piix4_devfn + 3, 0x1100, i8259[9]);
+    smbus = piix4_pm_init(pci_bus, piix4_devfn + 3, 0x1100, isa_reserve_irq(9));
     eeprom_buf = qemu_mallocz(8 * 256); /* XXX: make this persistent */
     for (i = 0; i < 8; i++) {
         /* TODO: Populate SPD eeprom data.  */
@@ -915,16 +917,17 @@
         qdev_prop_set_ptr(eeprom, "data", eeprom_buf + (i * 256));
         qdev_init(eeprom);
     }
-    pit = pit_init(0x40, i8259[0]);
+    pit = pit_init(0x40, isa_reserve_irq(0));
     DMA_init(0);
 
     /* Super I/O */
-    i8042_init(i8259[1], i8259[12], 0x60);
-    rtc_state = rtc_init(0x70, i8259[8], 2000);
-    serial_init(0x3f8, i8259[4], 115200, serial_hds[0]);
-    serial_init(0x2f8, i8259[3], 115200, serial_hds[1]);
+    isa_dev = isa_create_simple("i8042", 0x60, 0x64, 1, 12);
+ 
+    rtc_state = rtc_init(0x70, isa_reserve_irq(8), 2000);
+    serial_init(0x3f8, isa_reserve_irq(4), 115200, serial_hds[0]);
+    serial_init(0x2f8, isa_reserve_irq(3), 115200, serial_hds[1]);
     if (parallel_hds[0])
-        parallel_init(0x378, i8259[7], parallel_hds[0]);
+        parallel_init(0x378, isa_reserve_irq(7), parallel_hds[0]);
     for(i = 0; i < MAX_FD; i++) {
         dinfo = drive_get(IF_FLOPPY, 0, i);
         fd[i] = dinfo ? dinfo->bdrv : NULL;
diff --git a/hw/pc.c b/hw/pc.c
index 9004393..e5f3231 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -1363,7 +1363,7 @@
     }
 
     if (pci_enabled) {
-        pci_piix3_ide_init(pci_bus, hd, piix3_devfn + 1, isa_irq);
+        pci_piix3_ide_init(pci_bus, hd, piix3_devfn + 1);
     } else {
         for(i = 0; i < MAX_IDE_BUS; i++) {
             isa_ide_init(ide_iobase[i], ide_iobase2[i],
diff --git a/hw/piix4.c b/hw/piix4.c
index a9849ee..a6aea15 100644
--- a/hw/piix4.c
+++ b/hw/piix4.c
@@ -86,6 +86,7 @@
 {
     uint8_t *pci_conf;
 
+    isa_bus_new(&d->qdev);
     register_savevm("PIIX4", 0, 2, piix_save, piix_load, d);
 
     pci_conf = d->config;