VPICD_Convert_IRQ_To_Int

include vpicd.inc

mov     eax, IRQNum
mov     ebx, VMHandle
VxDcall VPICD_Convert_IRQ_To_Int
jc      not_valid
mov     [VecNum], eax

Retrieves the interrupt vector number that corresponds to the specified IRQ number for the given virtual machine. Uses EAX and Flags.

• Returns an interrupt vector number in EAX and clears the carry flag if the IRQ number is valid; otherwise sets the carry flag.

IRQNum

IRQ number.

VMHandle

Handle of the virtual machine.

Since virtual machines can map IRQ numbers of the virtual PIC to any interrupt vector numbers, virtual devices should always explicitly check which interrupt vector is mapped to a particular IRQ.