diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
index 655db9d..2707f93 100644
--- a/hw/cirrus_vga.c
+++ b/hw/cirrus_vga.c
@@ -2891,7 +2891,7 @@
 				 s->cirrus_mmio_io_addr);
 }
 
-void pci_cirrus_vga_init(DisplayState *ds, uint8_t *vga_ram_base, 
+void pci_cirrus_vga_init(PCIBus *bus, DisplayState *ds, uint8_t *vga_ram_base, 
                          unsigned long vga_ram_offset, int vga_ram_size)
 {
     PCICirrusVGAState *d;
@@ -2902,9 +2902,9 @@
     device_id = CIRRUS_ID_CLGD5446;
 
     /* setup PCI configuration registers */
-    d = (PCICirrusVGAState *)pci_register_device("Cirrus VGA", 
+    d = (PCICirrusVGAState *)pci_register_device(bus, "Cirrus VGA", 
                                                  sizeof(PCICirrusVGAState), 
-                                                 0, -1, NULL, NULL);
+                                                 -1, NULL, NULL);
     pci_conf = d->dev.config;
     pci_conf[0x00] = (uint8_t) (PCI_VENDOR_CIRRUS & 0xff);
     pci_conf[0x01] = (uint8_t) (PCI_VENDOR_CIRRUS >> 8);
diff --git a/hw/ide.c b/hw/ide.c
index 0908737..c352c63 100644
--- a/hw/ide.c
+++ b/hw/ide.c
@@ -1579,14 +1579,14 @@
 }
 
 /* hd_table must contain 4 block drivers */
-void pci_ide_init(BlockDriverState **hd_table)
+void pci_ide_init(PCIBus *bus, BlockDriverState **hd_table)
 {
     PCIIDEState *d;
     uint8_t *pci_conf;
     int i;
 
-    d = (PCIIDEState *)pci_register_device("IDE", sizeof(PCIIDEState),
-                                           0, -1, 
+    d = (PCIIDEState *)pci_register_device(bus, "IDE", sizeof(PCIIDEState),
+                                           -1, 
                                            NULL, NULL);
     pci_conf = d->dev.config;
     pci_conf[0x00] = 0x86; // Intel
@@ -1621,14 +1621,15 @@
 
 /* hd_table must contain 4 block drivers */
 /* NOTE: for the PIIX3, the IRQs and IOports are hardcoded */
-void pci_piix3_ide_init(BlockDriverState **hd_table)
+void pci_piix3_ide_init(PCIBus *bus, BlockDriverState **hd_table)
 {
     PCIIDEState *d;
     uint8_t *pci_conf;
     
     /* register a function 1 of PIIX3 */
-    d = (PCIIDEState *)pci_register_device("PIIX3 IDE", sizeof(PCIIDEState),
-                                           0, ((PCIDevice *)piix3_state)->devfn + 1, 
+    d = (PCIIDEState *)pci_register_device(bus, "PIIX3 IDE", 
+                                           sizeof(PCIIDEState),
+                                           ((PCIDevice *)piix3_state)->devfn + 1, 
                                            NULL, NULL);
     pci_conf = d->dev.config;
     pci_conf[0x00] = 0x86; // Intel
diff --git a/hw/ne2000.c b/hw/ne2000.c
index 9f35f19..50a3417 100644
--- a/hw/ne2000.c
+++ b/hw/ne2000.c
@@ -613,14 +613,15 @@
     register_ioport_read(addr + 0x1f, 1, 1, ne2000_reset_ioport_read, s);
 }
 
-void pci_ne2000_init(NetDriverState *nd)
+void pci_ne2000_init(PCIBus *bus, NetDriverState *nd)
 {
     PCINE2000State *d;
     NE2000State *s;
     uint8_t *pci_conf;
     
-    d = (PCINE2000State *)pci_register_device("NE2000", sizeof(PCINE2000State),
-                                              0, -1, 
+    d = (PCINE2000State *)pci_register_device(bus,
+                                              "NE2000", sizeof(PCINE2000State),
+                                              -1, 
                                               NULL, NULL);
     pci_conf = d->dev.config;
     pci_conf[0x00] = 0xec; // Realtek 8029
diff --git a/hw/openpic.c b/hw/openpic.c
index cc2137e..eab6d08 100644
--- a/hw/openpic.c
+++ b/hw/openpic.c
@@ -964,7 +964,8 @@
 #endif
 }
 
-openpic_t *openpic_init (uint32_t isu_base, uint32_t idu_base, int nb_cpus)
+openpic_t *openpic_init (PCIBus *bus,
+                         uint32_t isu_base, uint32_t idu_base, int nb_cpus)
 {
     openpic_t *opp;
     uint8_t *pci_conf;
@@ -973,8 +974,8 @@
     /* XXX: for now, only one CPU is supported */
     if (nb_cpus != 1)
         return NULL;
-    opp = (openpic_t *)pci_register_device("OpenPIC", sizeof(openpic_t),
-                                           0, -1, NULL, NULL);
+    opp = (openpic_t *)pci_register_device(bus, "OpenPIC", sizeof(openpic_t),
+                                           -1, NULL, NULL);
     if (opp == NULL)
         return NULL;
     pci_conf = opp->pci_dev.config;
diff --git a/hw/pc.c b/hw/pc.c
index 233f028..f578325 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -324,7 +324,8 @@
     int ret, linux_boot, initrd_size, i, nb_nics1, fd;
     unsigned long bios_offset, vga_bios_offset;
     int bios_size, isa_bios_size;
-
+    PCIBus *pci_bus;
+    
     linux_boot = (kernel_filename != NULL);
 
     /* allocate RAM */
@@ -432,8 +433,10 @@
     }
 
     if (pci_enabled) {
-        i440fx_init();
-        piix3_init();
+        pci_bus = i440fx_init();
+        piix3_init(pci_bus);
+    } else {
+        pci_bus = NULL;
     }
 
     /* init basic PC hardware */
@@ -443,15 +446,16 @@
 
     if (cirrus_vga_enabled) {
         if (pci_enabled) {
-            pci_cirrus_vga_init(ds, phys_ram_base + ram_size, ram_size, 
+            pci_cirrus_vga_init(pci_bus, 
+                                ds, phys_ram_base + ram_size, ram_size, 
                                 vga_ram_size);
         } else {
             isa_cirrus_vga_init(ds, phys_ram_base + ram_size, ram_size, 
                                 vga_ram_size);
         }
     } else {
-        vga_initialize(ds, phys_ram_base + ram_size, ram_size, 
-                       vga_ram_size, pci_enabled);
+        vga_initialize(pci_bus, ds, phys_ram_base + ram_size, ram_size, 
+                       vga_ram_size);
     }
 
     rtc_state = rtc_init(0x70, 8);
@@ -469,9 +473,9 @@
 
     if (pci_enabled) {
         for(i = 0; i < nb_nics; i++) {
-            pci_ne2000_init(&nd_table[i]);
+            pci_ne2000_init(pci_bus, &nd_table[i]);
         }
-        pci_piix3_ide_init(bs_table);
+        pci_piix3_ide_init(pci_bus, bs_table);
     } else {
         nb_nics1 = nb_nics;
         if (nb_nics1 > NE2000_NB_MAX)
diff --git a/hw/ppc_chrp.c b/hw/ppc_chrp.c
index 5411806..fce4348 100644
--- a/hw/ppc_chrp.c
+++ b/hw/ppc_chrp.c
@@ -89,13 +89,12 @@
     cpu_register_physical_memory(addr + 0x20000, 0x1000, ide1_mem_index);
 }
 
-static void macio_init(void)
+static void macio_init(PCIBus *bus)
 {
     PCIDevice *d;
 
-    d = pci_register_device("macio", sizeof(PCIDevice),
-                            0, -1, 
-                            NULL, NULL);
+    d = pci_register_device(bus, "macio", sizeof(PCIDevice),
+                            -1, NULL, NULL);
     /* Note: this code is strongly inspirated from the corresponding code
        in PearPC */
     d->config[0x00] = 0x6b; // vendor_id
@@ -128,7 +127,8 @@
     int ret, linux_boot, i, fd;
     unsigned long bios_offset;
     uint32_t kernel_base, kernel_size, initrd_base, initrd_size;
-    
+    PCIBus *pci_bus;
+
     linux_boot = (kernel_filename != NULL);
 
     /* allocate RAM */
@@ -182,17 +182,18 @@
     cpu_ppc_tb_init(cpu_single_env, 100UL * 1000UL * 1000UL);
 
     isa_mem_base = 0x80000000;
-    pci_pmac_init();
+    pci_bus = pci_pmac_init();
 
     /* Register 8 MB of ISA IO space */
     PPC_io_memory = cpu_register_io_memory(0, PPC_io_read, PPC_io_write, NULL);
     cpu_register_physical_memory(0xF2000000, 0x00800000, PPC_io_memory);
 
     /* init basic PC hardware */
-    vga_initialize(ds, phys_ram_base + ram_size, ram_size, 
-                   vga_ram_size, 1);
-    openpic = openpic_init(0x00000000, 0xF0000000, 1);
-
+    vga_initialize(pci_bus, ds, phys_ram_base + ram_size, ram_size, 
+                   vga_ram_size);
+    openpic = openpic_init(pci_bus, 0x00000000, 0xF0000000, 1);
+    pci_pmac_set_openpic(pci_bus, openpic);
+    
     /* XXX: suppress that */
     pic_init();
 
@@ -201,7 +202,7 @@
     serial_init(0x3f8, 4, fd);
 
     for(i = 0; i < nb_nics; i++) {
-        pci_ne2000_init(&nd_table[i]);
+        pci_ne2000_init(pci_bus, &nd_table[i]);
     }
 
     ide0_mem_index = pmac_ide_init(&bs_table[0], openpic, 0x13);
@@ -213,7 +214,7 @@
     adb_kbd_init(&adb_bus);
     adb_mouse_init(&adb_bus);
     
-    macio_init();
+    macio_init(pci_bus);
 
     nvram = m48t59_init(8, 0xFFF04000, 0x0074, NVRAM_SIZE);
     
diff --git a/hw/ppc_prep.c b/hw/ppc_prep.c
index 8d4e980..88dcac8 100644
--- a/hw/ppc_prep.c
+++ b/hw/ppc_prep.c
@@ -418,6 +418,7 @@
     int ret, linux_boot, i, nb_nics1, fd;
     unsigned long bios_offset;
     uint32_t kernel_base, kernel_size, initrd_base, initrd_size;
+    PCIBus *pci_bus;
 
     sysctrl = qemu_mallocz(sizeof(sysctrl_t));
     if (sysctrl == NULL)
@@ -477,14 +478,14 @@
     cpu_ppc_tb_init(cpu_single_env, 100UL * 1000UL * 1000UL);
 
     isa_mem_base = 0xc0000000;
-    pci_prep_init();
+    pci_bus = pci_prep_init();
     /* Register 64 KB of ISA IO space */
     PPC_io_memory = cpu_register_io_memory(0, PPC_io_read, PPC_io_write, NULL);
     cpu_register_physical_memory(0x80000000, 0x00010000, PPC_io_memory);
 
     /* init basic PC hardware */
-    vga_initialize(ds, phys_ram_base + ram_size, ram_size, 
-                   vga_ram_size, 1);
+    vga_initialize(pci_bus, ds, phys_ram_base + ram_size, ram_size, 
+                   vga_ram_size);
     rtc_init(0x70, 8);
     //    openpic = openpic_init(0x00000000, 0xF0000000, 1);
     //    pic_init(openpic);
@@ -545,6 +546,4 @@
                          /* XXX: need an option to load a NVRAM image */
                          0,
                          graphic_width, graphic_height, graphic_depth);
-
-    pci_ppc_bios_init();
 }
diff --git a/hw/vga.c b/hw/vga.c
index 57bad8f..1a55975 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -1747,9 +1747,8 @@
 }
 
 
-int vga_initialize(DisplayState *ds, uint8_t *vga_ram_base, 
-                   unsigned long vga_ram_offset, int vga_ram_size, 
-                   int is_pci)
+int vga_initialize(PCIBus *bus, DisplayState *ds, uint8_t *vga_ram_base, 
+                   unsigned long vga_ram_offset, int vga_ram_size)
 {
     VGAState *s;
 
@@ -1805,14 +1804,13 @@
     cpu_register_physical_memory(isa_mem_base + 0x000a0000, 0x20000, 
                                  vga_io_memory);
 
-    if (is_pci) {
+    if (bus) {
         PCIDevice *d;
         uint8_t *pci_conf;
 
-        d = pci_register_device("VGA", 
+        d = pci_register_device(bus, "VGA", 
                                 sizeof(PCIDevice),
-                                0, -1, 
-                                NULL, NULL);
+                                -1, NULL, NULL);
         pci_conf = d->config;
         pci_conf[0x00] = 0x34; // dummy VGA (same as Bochs ID)
         pci_conf[0x01] = 0x12;
diff --git a/vl.h b/vl.h
index 1573df7..aa99c27 100644
--- a/vl.h
+++ b/vl.h
@@ -457,6 +457,7 @@
 
 extern target_phys_addr_t pci_mem_base;
 
+typedef struct PCIBus PCIBus;
 typedef struct PCIDevice PCIDevice;
 
 typedef void PCIConfigWriteFunc(PCIDevice *pci_dev, 
@@ -484,7 +485,7 @@
     uint8_t config[256];
 
     /* the following fields are read only */
-    int bus_num;
+    PCIBus *bus;
     int devfn;
     char name[64];
     PCIIORegion io_regions[PCI_NUM_REGIONS];
@@ -495,8 +496,8 @@
     int irq_index;
 };
 
-PCIDevice *pci_register_device(const char *name, int instance_size,
-                               int bus_num, int devfn,
+PCIDevice *pci_register_device(PCIBus *bus, const char *name,
+                               int instance_size, int devfn,
                                PCIConfigReadFunc *config_read, 
                                PCIConfigWriteFunc *config_write);
 
@@ -513,20 +514,22 @@
 
 extern struct PIIX3State *piix3_state;
 
-void i440fx_init(void);
-void piix3_init(void);
+PCIBus *i440fx_init(void);
+void piix3_init(PCIBus *bus);
 void pci_bios_init(void);
 void pci_info(void);
 
 /* temporary: will be moved in platform specific file */
-void pci_prep_init(void);
-void pci_pmac_init(void);
-void pci_ppc_bios_init(void);
+PCIBus *pci_prep_init(void);
+struct openpic_t;
+void pci_pmac_set_openpic(PCIBus *bus, struct openpic_t *openpic);
+PCIBus *pci_pmac_init(void);
 
 /* openpic.c */
 typedef struct openpic_t openpic_t;
 void openpic_set_irq (openpic_t *opp, int n_IRQ, int level);
-openpic_t *openpic_init (uint32_t isu_base, uint32_t idu_base, int nb_cpus);
+openpic_t *openpic_init (PCIBus *bus,
+                         uint32_t isu_base, uint32_t idu_base, int nb_cpus);
 
 /* vga.c */
 
@@ -551,17 +554,15 @@
     s->dpy_resize(s, w, h);
 }
 
-int vga_initialize(DisplayState *ds, uint8_t *vga_ram_base, 
-                   unsigned long vga_ram_offset, int vga_ram_size, 
-                   int is_pci);
+int vga_initialize(PCIBus *bus, DisplayState *ds, uint8_t *vga_ram_base, 
+                   unsigned long vga_ram_offset, int vga_ram_size);
 void vga_update_display(void);
 void vga_invalidate_display(void);
 void vga_screen_dump(const char *filename);
 
 /* cirrus_vga.c */
-void pci_cirrus_vga_init(DisplayState *ds, uint8_t *vga_ram_base, 
+void pci_cirrus_vga_init(PCIBus *bus, DisplayState *ds, uint8_t *vga_ram_base, 
                          unsigned long vga_ram_offset, int vga_ram_size);
-
 void isa_cirrus_vga_init(DisplayState *ds, uint8_t *vga_ram_base, 
                          unsigned long vga_ram_offset, int vga_ram_size);
 
@@ -575,8 +576,8 @@
 
 void isa_ide_init(int iobase, int iobase2, int irq,
                   BlockDriverState *hd0, BlockDriverState *hd1);
-void pci_ide_init(BlockDriverState **hd_table);
-void pci_piix3_ide_init(BlockDriverState **hd_table);
+void pci_ide_init(PCIBus *bus, BlockDriverState **hd_table);
+void pci_piix3_ide_init(PCIBus *bus, BlockDriverState **hd_table);
 int pmac_ide_init (BlockDriverState **hd_table,
                    openpic_t *openpic, int irq);
 
@@ -627,7 +628,7 @@
 /* ne2000.c */
 
 void isa_ne2000_init(int base, int irq, NetDriverState *nd);
-void pci_ne2000_init(NetDriverState *nd);
+void pci_ne2000_init(PCIBus *bus, NetDriverState *nd);
 
 /* pckbd.c */