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port92: handle A20 IRQ as GPIO 

The port92 device has outgouing IRQ line A20. Currently the IRQ is referenced
by a pointer which normally is set during machine initialization. The
pointer is never changed at runtime. Hence, common GPIO model can be applied
to A20 IRQ line. Note that checking for IRQ to be connected as in
previous version of code is not required qemu_set_irq will do it.

Signed-off-by: Efimov Vasily <real@ispras.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Efimov Vasily 2016-06-22 15:24:52 +03:00 committed by Paolo Bonzini
parent 3115b9e2d2
commit d812b3d68d
2 changed files with 7 additions and 5 deletions
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10
hw/i386/pc.c
View File

@ -505,7 +505,7 @@ typedef struct Port92State {
MemoryRegion io;
uint8_t outport;
qemu_irq *a20_out;
qemu_irq a20_out;
} Port92State;
static void port92_write(void *opaque, hwaddr addr, uint64_t val,
@ -516,7 +516,7 @@ static void port92_write(void *opaque, hwaddr addr, uint64_t val,
DPRINTF("port92: write 0x%02" PRIx64 "\n", val);
s->outport = val;
qemu_set_irq(*s->a20_out, (val >> 1) & 1);
qemu_set_irq(s->a20_out, (val >> 1) & 1);
if ((val & 1) && !(oldval & 1)) {
qemu_system_reset_request();
}
@ -535,9 +535,7 @@ static uint64_t port92_read(void *opaque, hwaddr addr,
static void port92_init(ISADevice *dev, qemu_irq *a20_out)
{
Port92State *s = PORT92(dev);
s->a20_out = a20_out;
qdev_connect_gpio_out_named(DEVICE(dev), PORT92_A20_LINE, 0, *a20_out);
}
static const VMStateDescription vmstate_port92_isa = {
@ -574,6 +572,8 @@ static void port92_initfn(Object *obj)
memory_region_init_io(&s->io, OBJECT(s), &port92_ops, s, "port92", 1);
s->outport = 0;
qdev_init_gpio_out_named(DEVICE(obj), &s->a20_out, PORT92_A20_LINE, 1);
}
static void port92_realizefn(DeviceState *dev, Error **errp)

2
include/hw/i386/pc.h
View File

@ -277,6 +277,8 @@ int cmos_get_fd_drive_type(FloppyDriveType fd0);
#define FW_CFG_IO_BASE 0x510
#define PORT92_A20_LINE "a20"
/* acpi_piix.c */
I2CBus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base,