DevHlp GetIRQMask

Retrieve the mask state of an IRQ level

This function reads the current IRQ mask state for the specified IRQ.

Parameters

Specified IRQ level.

Exit

• EAX=0, mask disabled (IRQ enabled).
• EAX=1, mask enabled (IRQ disabled)

Assembly language

     ;       dh_GetIRQMask - Retrieve a specified IRQ mask state
     ;
     ;       This function reads the current IRQ mask state for the specified IRQ.
     ;
     ;       ENTRY   AL = IRQ
     ;
     ;       EXIT-SUCCESS
     ;           EAX - 0 = mask disabled (IRQ enabled)
     ;               - 1 = mask enabled (IRQ disabled)
     ;
     ;       EXIT-FAILURE
     ;           NONE
     ;

       MOV     AL,IRQ whose mask state is to be retrieved
       MOV     DL,DevHlp_GetIRQMask
       CALL    DevHlp
       JC      Error