hpet: make optional

Ignore failure with hpet device creation.
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

Makefile.objs

@@ -195,6 +195,7 @@ hw-obj-$(CONFIG_FDC) += fdc.o
 hw-obj-$(CONFIG_ACPI) += acpi.o acpi_piix4.o
 hw-obj-$(CONFIG_APM) += pm_smbus.o apm.o
 hw-obj-$(CONFIG_DMA) += dma.o
+hw-obj-$(CONFIG_HPET) += hpet.o
 
 # PPC devices
 hw-obj-$(CONFIG_OPENPIC) += openpic.o

Makefile.target

@@ -215,7 +215,7 @@ obj-$(CONFIG_KVM) += ivshmem.o
 obj-i386-y += vga.o
 obj-i386-y += mc146818rtc.o i8259.o pc.o
 obj-i386-y += cirrus_vga.o apic.o ioapic.o piix_pci.o
-obj-i386-y += vmport.o hpet.o applesmc.o
+obj-i386-y += vmport.o applesmc.o
 obj-i386-y += device-hotplug.o pci-hotplug.o smbios.o wdt_ib700.o
 obj-i386-y += debugcon.o multiboot.o
 obj-i386-y += pc_piix.o

default-configs/i386-softmmu.mak

@@ -19,3 +19,4 @@ CONFIG_IDE_PIIX=y
 CONFIG_NE2000_ISA=y
 CONFIG_PIIX_PCI=y
 CONFIG_SOUND=y
+CONFIG_HPET=y

default-configs/x86_64-softmmu.mak

@@ -19,3 +19,4 @@ CONFIG_IDE_PIIX=y
 CONFIG_NE2000_ISA=y
 CONFIG_PIIX_PCI=y
 CONFIG_SOUND=y
+CONFIG_HPET=y

hw/hpet.c

@@ -74,8 +74,6 @@ typedef struct HPETState {
     uint8_t  hpet_id;           /* instance id */
 } HPETState;
 
-struct hpet_fw_config hpet_cfg = {.count = UINT8_MAX};
-
 static uint32_t hpet_in_legacy_mode(HPETState *s)
 {
     return s->config & HPET_CFG_LEGACY;

hw/pc.c

@@ -84,6 +84,7 @@ struct e820_table {
 } __attribute((__packed__, __aligned__(4)));
 
 static struct e820_table e820_table;
+struct hpet_fw_config hpet_cfg = {.count = UINT8_MAX};
 
 void isa_irq_handler(void *opaque, int n, int level)
 {
@@ -1104,12 +1105,14 @@ void pc_basic_device_init(qemu_irq *isa_irq,
     register_ioport_write(0xf0, 1, 1, ioportF0_write, NULL);
 
     if (!no_hpet) {
-        DeviceState *hpet = sysbus_create_simple("hpet", HPET_BASE, NULL);
+        DeviceState *hpet = sysbus_try_create_simple("hpet", HPET_BASE, NULL);
 
-        for (i = 0; i < 24; i++) {
-            sysbus_connect_irq(sysbus_from_qdev(hpet), i, isa_irq[i]);
+        if (hpet) {
+            for (i = 0; i < 24; i++) {
+                sysbus_connect_irq(sysbus_from_qdev(hpet), i, isa_irq[i]);
+            }
+            rtc_irq = qdev_get_gpio_in(hpet, 0);
         }
-        rtc_irq = qdev_get_gpio_in(hpet, 0);
     }
     *rtc_state = rtc_init(2000, rtc_irq);