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;
movzx edx, WORD PTR [VPD_BIOS_Base_Addr][ecx*2]
test edx, edx ; Q: Is there a printer here?
jz SHORT VPD_Init_Next_LPT ; N: Test next one
mov [esi.VPD_IO_Base], edx ; Y: Save port base addr
inc edi ; One more LPT virtualized
test dh, dh ; Q: Hardware port? (> 0FFh)
jz SHORT VPD_Init_Next_LPT ; N: Network printer!
cmp esi, [VPD_Sgrab_LPT] ; Y: Q: SGRAB using it?
je SHORT VPD_Init_Next_LPT ; Y: Don't trap I/O
; N: Hook I/O ports
;
; Some networks place the I/O address for LPT1 into the LPT2 and LPT3
; base address fields. Make sure that hasn't happened.
;
cmp esi, OFFSET32 VPD_LPT1
je SHORT VPD_Hardware_Port
cmp [VPD_LPT1.VPD_IO_Base], edx
je SHORT VPD_Duplicate_IO_Port
cmp esi, OFFSET32 VPD_LPT2
je SHORT VPD_Hardware_Port
cmp [VPD_LPT2.VPD_IO_Base], edx
jne SHORT VPD_Hardware_Port
.ERRNZ VPD_Max_Virt_LPTs - 3
VPD_Duplicate_IO_Port: ; I/O base address duplicated
mov [esi.VPD_IO_Base], 1 ; Set IO base to 1 to indicate
jmp SHORT VPD_Init_Next_LPT ; a network printer port
;
; This is a physical printer port. Hook the I/O ports starting with
; port # in EDX.
;
VPD_Hardware_Port:
push ecx ; Save loop counter
push esi ; and data structure pointer
mov esi, [esi.VPD_Proc_Addr] ; ESI -> Procedure to call
mov ecx, VPD_Num_Ports_Per_LPT ; ECX = # of ports to hook
VPD_ITrap_Loop:
VMMcall Install_IO_Handler ; Install port hook
inc edx ; EDX = Next LPT port to hook
loopd VPD_ITrap_Loop ; Loop until all hooked
pop esi ; Restore
pop ecx
VPD_Init_Next_LPT:
add esi, SIZE VPD_Struc ; ESI -> Next data structure
inc ecx ; Bump counter
cmp ecx, VPD_Max_Virt_LPTs ; Q: More LPTs to init?
jb VPD_Init_Loop ; Y: Loop
;
; All printer ports hooked. At this point we check to see if there are
; any printers (network or hardware) connected. If there are none then
; VPD_Device_Init will return with carry SET to indicate that it should
; never be called again. If any printers do exist then VPD hooks IRQ 7
; hardware interrupt an
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