mos6522: expose mos6522_update_irq() through MOS6522DeviceClass

In the case where we have an interrupt generated externally from inputs to
bits 1 and 2 of port A and/or port B, it is necessary to expose
mos6522_update_irq() so it can be called by the interrupt source.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/misc/mos6522.c

@@ -463,6 +463,7 @@ static void mos6522_class_init(ObjectClass *oc, void *data)
     mdc->set_sr_int = mos6522_set_sr_int;
     mdc->portB_write = mos6522_portB_write;
     mdc->portA_write = mos6522_portA_write;
+    mdc->update_irq = mos6522_update_irq;
     mdc->get_timer1_counter_value = mos6522_get_counter_value;
     mdc->get_timer2_counter_value = mos6522_get_counter_value;
     mdc->get_timer1_load_time = mos6522_get_load_time;

include/hw/misc/mos6522.h

@@ -134,6 +134,7 @@ typedef struct MOS6522DeviceClass {
     void (*set_sr_int)(MOS6522State *dev);
     void (*portB_write)(MOS6522State *dev);
     void (*portA_write)(MOS6522State *dev);
+    void (*update_irq)(MOS6522State *dev);
     /* These are used to influence the CUDA MacOS timebase calibration */
     uint64_t (*get_timer1_counter_value)(MOS6522State *dev, MOS6522Timer *ti);
     uint64_t (*get_timer2_counter_value)(MOS6522State *dev, MOS6522Timer *ti);