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mips_malta: move i8259 initialization after piix4 initialization

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i8259 is an ISA device (or at least, depends on the ISA infrastructure to
register its ioport); and the ISA bus is supplied by piix4.  Later patches
make this dependency explicit.

Use qemu_irq_proxy() to stop the cycle by adding an extra layer of
indirection.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2011-09-12 13:00:05 +03:00
parent 60ea6aa8fc
commit 5632ae46d5
1 changed files with 15 additions and 5 deletions
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20
hw/mips_malta.c
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@ -778,7 +778,7 @@ void mips_malta_init (ram_addr_t ram_size,
int64_t kernel_entry;
PCIBus *pci_bus;
CPUState *env;
qemu_irq *i8259;
qemu_irq *i8259 = NULL, *isa_irq;
qemu_irq *cpu_exit_irq;
int piix4_devfn;
i2c_bus *smbus;
@ -928,17 +928,27 @@ void mips_malta_init (ram_addr_t ram_size,
cpu_mips_irq_init_cpu(env);
cpu_mips_clock_init(env);
/* Interrupt controller */
/* The 8259 is attached to the MIPS CPU INT0 pin, ie interrupt 2 */
i8259 = i8259_init(env->irq[2]);
/*
* We have a circular dependency problem: pci_bus depends on isa_irq,
* isa_irq is provided by i8259, i8259 depends on ISA, ISA depends
* on piix4, and piix4 depends on pci_bus. To stop the cycle we have
* qemu_irq_proxy() adds an extra bit of indirection, allowing us
* to resolve the isa_irq -> i8259 dependency after i8259 is initialized.
*/
isa_irq = qemu_irq_proxy(&i8259, 16);
/* Northbridge */
pci_bus = gt64120_register(i8259);
pci_bus = gt64120_register(isa_irq);
/* Southbridge */
ide_drive_get(hd, MAX_IDE_BUS);
piix4_devfn = piix4_init(pci_bus, 80);
/* Interrupt controller */
/* The 8259 is attached to the MIPS CPU INT0 pin, ie interrupt 2 */
i8259 = i8259_init(env->irq[2]);
isa_bus_irqs(i8259);
pci_piix4_ide_init(pci_bus, hd, piix4_devfn + 1);
usb_uhci_piix4_init(pci_bus, piix4_devfn + 2);