acpi.c: make qemu_system_device_hot_add piix independent.

introruce piix4_device_hot_add() for piix4 specific code
and make qemu_system_device_hot_add() generic.
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/acpi.c

@@ -714,7 +714,9 @@ static void pciej_write(void *opaque, uint32_t addr, uint32_t val)
 #endif
 }
 
-void qemu_system_hot_add_init(void)
+static void piix4_device_hot_add(int bus, int slot, int state);
+
+void piix4_acpi_system_hot_add_init(void)
 {
     register_ioport_write(GPE_BASE, 4, 1, gpe_writeb, &gpe);
     register_ioport_read(GPE_BASE, 4, 1,  gpe_readb, &gpe);
@@ -724,6 +726,8 @@ void qemu_system_hot_add_init(void)
 
     register_ioport_write(PCI_EJ_BASE, 4, 4, pciej_write, NULL);
     register_ioport_read(PCI_EJ_BASE, 4, 4,  pciej_read, NULL);
+
+    qemu_system_device_hot_add_register(piix4_device_hot_add);
 }
 
 static void enable_device(struct pci_status *p, struct gpe_regs *g, int slot)
@@ -738,7 +742,7 @@ static void disable_device(struct pci_status *p, struct gpe_regs *g, int slot)
     p->down |= (1 << slot);
 }
 
-void qemu_system_device_hot_add(int bus, int slot, int state)
+static void piix4_device_hot_add(int bus, int slot, int state)
 {
     pci0_status.up = 0;
     pci0_status.down = 0;
@@ -752,6 +756,18 @@ void qemu_system_device_hot_add(int bus, int slot, int state)
     }
 }
 
+static qemu_system_device_hot_add_t device_hot_add_callback;
+void qemu_system_device_hot_add_register(qemu_system_device_hot_add_t callback)
+{
+    device_hot_add_callback = callback;
+}
+
+void qemu_system_device_hot_add(int pcibus, int slot, int state)
+{
+    if (device_hot_add_callback)
+        device_hot_add_callback(pcibus, slot, state);
+}
+
 struct acpi_table_header
 {
     char signature [4];    /* ACPI signature (4 ASCII characters) */

hw/pc.c

@@ -1081,7 +1081,7 @@ static void pc_init1(ram_addr_t ram_size,
             pci_nic_init(pci_bus, nd, -1, "ne2k_pci");
     }
 
-    qemu_system_hot_add_init();
+    piix4_acpi_system_hot_add_init();
 
     if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {
         fprintf(stderr, "qemu: too many IDE bus\n");

hw/pc.h

@@ -108,11 +108,14 @@ extern int acpi_enabled;
 extern char *acpi_tables;
 extern size_t acpi_tables_len;
 
+void acpi_bios_init(void);
+int acpi_table_add(const char *table_desc);
+
+/* acpi_piix.c */
 i2c_bus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base,
                        qemu_irq sci_irq);
 void piix4_smbus_register_device(SMBusDevice *dev, uint8_t addr);
-void acpi_bios_init(void);
-int acpi_table_add(const char *table_desc);
+void piix4_acpi_system_hot_add_init(void);
 
 /* hpet.c */
 extern int no_hpet;

sysemu.h

@@ -194,7 +194,8 @@ extern int drive_add(const char *file, const char *fmt, ...);
 extern int drive_init(struct drive_opt *arg, int snapshot, void *machine);
 
 /* acpi */
-void qemu_system_hot_add_init(void);
+typedef void (*qemu_system_device_hot_add_t)(int pcibus, int slot, int state);
+void qemu_system_device_hot_add_register(qemu_system_device_hot_add_t callback);
 void qemu_system_device_hot_add(int pcibus, int slot, int state);
 
 /* device-hotplug */