VID_Mask_Change

VID_Mask_Change_Proc

include vpicd.inc

mov eax, IRQHand ; IRQ handle

mov ebx, VMId ; current VM handle

mov ecx, Mask ; zero if unmasking IRQ, nonzero if masking

call VID_Mask_Change_Proc

The VID_Mask_Change_Proc procedure processes attempts to mask or unmask the specified IRQ. The system calls this procedure whenever a virtual machine attempts to mask or unmask an interrupt.

The system disables interrupts before calling this procedure. The procedure can re-enable interrupts if necessary.

Parameters

IRQHand

Specifies the handle for the interrupt request.

VMId

Specifies the handle of the current virtual machine.

Mask

Specifies whether the IRQ is being masked or unmasked. This parameter is nonzero if the IRQ is being masked, and is zero if it is being masked.

Return Value

This procedure has no return value.

Comments

A virtual device typically uses this procedure to detect contention for a device. The default interrupt routines use this callback to detect conflicts with nonglobal interrupts.

This procedure may modify the EAX, EBX, ECX, EDX, ESI, and Flags registers.