PAGE ,132 TITLE DXNETBIO.ASM -- Dos Extender NetBIOS API Mapper ; Copyright (c) Microsoft Corporation 1989-1991. All Rights Reserved. ;*********************************************************************** ; ; DXNETBIO.ASM - DOS Extender NetBIOS API Mapper ; ;----------------------------------------------------------------------- ; ; This module provides the 286 DOS Extender's API mapping of Int 2Ah and ; 5Ch NetBIOS requests. It allows a protected mode application to ; issue NetBIOS requests without worrying about segment to selector ; translations and mapping of buffers between extended and conventional ; memory. ; ;----------------------------------------------------------------------- ; ; 11/29/90 amitc Modified code to have the POST routine in GlobalMemory ; and queue the POST when DOSX is not around. ; 11/29/90 amitc Call to InitLowHeap moved to this file from DXOEM.ASM ; 02/01/90 jimmat Update Api mapping table for Ungerman-Bass extensions ; as per new data from UB. ; 06/15/89 w-glenns Finished TermNetMapper, added Delay/ResumeNetPosting ; 04/18/89 jimmat Original version. ; 18-Dec-1992 sudeepb Changed cli/sti to faster FCLI/FSTI ; ;*********************************************************************** .286p ; ------------------------------------------------------- ; INCLUDE FILE DEFINITIONS ; ------------------------------------------------------- .xlist .sall include segdefs.inc include gendefs.inc include pmdefs.inc include interupt.inc include netbios.inc IFDEF ROM include dxrom.inc ENDIF include intmac.inc include stackchk.inc include bop.inc include rdrsvc.inc .list ; ------------------------------------------------------- ; FLAG FOR PM NCB HANDLING ; ------------------------------------------------------- PM_NCB_HANDLING equ 1 ; set to 0 for NCB handling in VM ; ------------------------------------------------------- ; GENERAL SYMBOL DEFINITIONS ; ------------------------------------------------------- ; The following equates define the codes that map between a NCB Command code ; and the mapping flags used to process it. To be compatible with Windows/386, ; these values are all increments of 4 (they use 32 bit offsets). These ; values should always correspond to the values used by the Windows/386 ; NetBIOS mapping! ApiMapUnknown EQU 00h ApiMapNone EQU 04h ApiMapIn EQU 08h ApiMapOut EQU 0Ch ApiMapInOut EQU 10h ApiChainSend EQU 14h ApiCancel EQU 18h ApiBufferIn EQU 1Ch ApiBufferOut EQU 20h ApiBufferInOut EQU 24h ; The following equates define the bit flags which identify the actions ; to take on entry and exit of a NetBIOS request. BUFF_IN EQU 01h ;Buffer data to the int handler BUFF_OUT EQU 02h ;Buffer data from the int handler BUFF_CHAIN EQU 04h ;Special chain send buffering BUFF_CANCEL EQU 08h ;Special cancel buffering REPLACE_MAP_TABLE EQU 1607h ;Int2fh replace net map table service VNETBIOS_DEV_ID EQU 14h ;VNETBIOS device ID ; ------------------------------------------------------- ; EXTERNAL SYMBOL DEFINITIONS ; ------------------------------------------------------- extrn EnterIntHandler:NEAR extrn LeaveIntHandler:NEAR extrn EnterRealMode:NEAR extrn EnterProtectedMode:NEAR extrn AllocateLowBlock:NEAR extrn FreeLowBlock:NEAR extrn GetSegmentAddress:NEAR externFP NSetSegmentDscr extrn AllocateLDTSelector:NEAR extrn Lma2SegOff:NEAR extrn InitLowHeap:NEAR ; ------------------------------------------------------- ; DATA SEGMENT DEFINITIONS ; ------------------------------------------------------- DXDATA segment extrn pbReflStack:WORD extrn bReflStack:WORD extrn rglpfnRmISR:DWORD extrn regUserSS:WORD extrn regUserSP:WORD extrn rgbXfrBuf1:BYTE extrn segDXCode:WORD extrn NetHeapSize:WORD ifdef WOW_x86 extrn FastBop:fword endif OldInt76 dd 0 public HCB_List Cancel_NCB EQU rgbXfrBuf1 ;Easier for commenting/readability HCB_List dw 0 ;linked list of low HCB/NCB/Buffers selNetScr dw 0 ;scratch selector lpfnOldInt2A dd ? ;old int vector 2Ah & 5Ch routines lpfnOldInt5C dd ? lpfnRmNetIsr dd ? ;Real Mode vector to Network Int Rtn SelNetStubCode dw 0 ;sel for stub code SegNetStubCode dw 0 ;segment for stub code AddrfStubDelayNetPosting dw ? ;address of fStubDelayNetPosting in StubSeg AddrfStubTermNetRequest dw ? ;address of fStubTermNetRequest in StubSeg NBPSp dw 0 ; The ApiMapTbl converts an NCB Command code (0-7F) into a code that ; identifies the particular mapping routine to execute. ApiMapTbl label byte db ApiMapUnknown ; 00h - db ApiMapUnknown ; 01h - db ApiMapUnknown ; 02h - db ApiMapUnknown ; 03h - db ApiMapUnknown ; 04h - db ApiMapUnknown ; 05h - db ApiMapUnknown ; 06h - db ApiMapUnknown ; 07h - db ApiMapUnknown ; 08h - db ApiMapUnknown ; 09h - db ApiMapUnknown ; 0Ah - db ApiMapUnknown ; 0Bh - db ApiMapUnknown ; 0Ch - db ApiMapUnknown ; 0Dh - db ApiMapUnknown ; 0Eh - db ApiMapUnknown ; 0Fh - db ApiMapNone ; 10h - Call db ApiMapNone ; 11h - Listen db ApiMapNone ; 12h - Hang up db ApiMapUnknown ; 13h - db ApiBufferIn ; 14h - Send db ApiBufferOut ; 15h - Receive db ApiBufferOut ; 16h - Receive any db ApiChainSend ; 17h - Chain send db ApiMapUnknown ; 18h - db ApiMapUnknown ; 19h - db ApiMapUnknown ; 1Ah - db ApiMapUnknown ; 1Bh - db ApiMapUnknown ; 1Ch - db ApiMapUnknown ; 1Dh - db ApiMapUnknown ; 1Eh - db ApiMapUnknown ; 1Fh - db ApiBufferIn ; 20h - Send datagram db ApiBufferOut ; 21h - Receive datagram db ApiBufferIn ; 22h - Send broadcast datagram db ApiBufferOut ; 23h - Receive broadcast dgram db ApiMapUnknown ; 24h - db ApiMapUnknown ; 25h - db ApiMapUnknown ; 26h - db ApiMapUnknown ; 27h - db ApiMapUnknown ; 28h - db ApiMapUnknown ; 29h - db ApiMapUnknown ; 2Ah - db ApiMapUnknown ; 2Bh - db ApiMapUnknown ; 2Ch - db ApiMapUnknown ; 2Dh - db ApiMapUnknown ; 2Eh - db ApiMapUnknown ; 2Fh - db ApiMapNone ; 30h - Add name db ApiMapNone ; 31h - Delete name db ApiMapNone ; 32h - Reset db ApiMapOut ; 33h - Adapter status db ApiMapOut ; 34h - Session status db ApiCancel ; 35h - Cancel db ApiMapNone ; 36h - Add group name db ApiMapUnknown ; 37h - db ApiMapUnknown ; 38h - db ApiMapUnknown ; 39h - db ApiMapUnknown ; 3Ah - db ApiMapUnknown ; 3Bh - db ApiMapUnknown ; 3Ch - db ApiMapUnknown ; 3Dh - db ApiMapUnknown ; 3Eh - db ApiMapUnknown ; 3Fh - db ApiMapUnknown ; 40h - db ApiMapUnknown ; 41h - db ApiMapUnknown ; 42h - db ApiMapUnknown ; 43h - db ApiMapUnknown ; 44h - db ApiMapUnknown ; 45h - db ApiMapUnknown ; 46h - db ApiMapUnknown ; 47h - db ApiMapUnknown ; 48h - db ApiMapUnknown ; 49h - db ApiMapUnknown ; 4Ah - db ApiMapUnknown ; 4Bh - db ApiMapUnknown ; 4Ch - db ApiMapUnknown ; 4Dh - db ApiMapUnknown ; 4Eh - db ApiMapUnknown ; 4Fh - db ApiMapUnknown ; 50h - db ApiMapUnknown ; 51h - db ApiMapUnknown ; 52h - db ApiMapUnknown ; 53h - db ApiMapUnknown ; 54h - db ApiMapUnknown ; 55h - db ApiMapUnknown ; 56h - db ApiMapUnknown ; 57h - db ApiMapUnknown ; 58h - db ApiMapUnknown ; 59h - db ApiMapUnknown ; 5Ah - db ApiMapUnknown ; 5Bh - db ApiMapUnknown ; 5Ch - db ApiMapUnknown ; 5Dh - db ApiMapUnknown ; 5Eh - db ApiMapUnknown ; 5Fh - db ApiMapUnknown ; 60h - db ApiMapUnknown ; 61h - db ApiMapUnknown ; 62h - db ApiMapUnknown ; 63h - db ApiMapUnknown ; 64h - db ApiMapUnknown ; 65h - db ApiMapUnknown ; 66h - db ApiMapUnknown ; 67h - db ApiMapUnknown ; 68h - db ApiMapUnknown ; 69h - db ApiMapUnknown ; 6Ah - db ApiMapUnknown ; 6Bh - db ApiMapUnknown ; 6Ch - db ApiMapUnknown ; 6Dh - db ApiMapUnknown ; 6Eh - db ApiMapUnknown ; 6Fh - db ApiMapNone ; 70h - Unlink db ApiMapUnknown ; 71h - db ApiMapNone ; 72h - Ungerman Bass Register db ApiBufferIn ; 73h - Ungerman Bass SendNmc db ApiMapNone ; 74h - Ungerman Bass Callniu db ApiMapNone ; 75h - Ungerman Bass Calladdr db ApiMapNone ; 76h - Ungerman Bass Listenaddr db ApiBufferIn ; 77h - Ungerman Bass SendPkt db ApiBufferOut ; 78h - Ungerman Bass RcvPkt db ApiBufferIn ; 79h - Ungerman Bass SendAttn db ApiBufferOut ; 7Ah - Ungerman Bass RcvAttn db ApiBufferOut ; 7Bh - Ungerman Bass Listenniu db ApiBufferOut ; 7Ch - Ungerman Bass RcvRaw db ApiBufferIn ; 7Dh - Ungerman Bass SendNmc2 db ApiMapUnknown ; 7Eh - db ApiMapNone ; 7Fh - Install check ; The next table maps the (Windows/386 compatible) code from ApiMapTbl ; to the bit flags which control our entry/exit mapping. EntryExitFlags label byte db BUFF_IN+BUFF_OUT ;ApiMapUnknown db 0 ;ApiMapNone db BUFF_IN ;ApiMapIn db BUFF_OUT ;ApiMapOut db BUFF_IN+BUFF_OUT ;ApiMapInOut db BUFF_CHAIN ;ApiChainSend db BUFF_CANCEL ;ApiCancel db BUFF_IN ;ApiBufferIn db BUFF_OUT ;ApiBufferOut db BUFF_IN+BUFF_OUT ;ApiBufferInOut DXDATA ends ; ------------------------------------------------------- ; CODE SEGMENT VARIABLES ; ------------------------------------------------------- DXCODE segment IFNDEF ROM extrn selDgroup:WORD ENDIF DXCODE ends DXPMCODE segment extrn selDgroupPM:WORD DXPMCODE ends page ; ---------------------------------------------------------------------- ; ; The following routines handle INT 2Ah and 5Ch interrupts that ; request NetBIOS services. Typically, these interrupts require ; that a NCB and/or buffer be copied between conventional and ; extended memory, and register values be modified due to real- ; mode/protected-mode addressing differences. ; ; (Note: this comment copied almost unchanged from DXINTR.ASM) ; ; The following conventions are used: ; ; A stack is allocated from the interrupt reflector stack for these ; routines to use. This allows nested servicing of interrupts. ; A stack frame is built in the allocated stack which contains the ; following information: ; ; original caller's stack address ; caller's original flags and general registers (in pusha form) ; caller's original segment registers (DS & ES) ; flags and general registers to be passed to interrupt routine ; (initially the same as caller's original values) ; segment registers (DS & ES) to be passed to interrupt routine ; (initially set to the Dos Extender data segment address) ; ; This stack frame is built by the routine EnterIntHandler, and its ; format is defined by the structure INTRSTACK. The stack frame is ; destroyed and the processor registers set up for return to the user ; by the function LeaveIntHandler. ; ; There are two sets of general registers and two sets of segment ; registers (DS & ES) on the stack frame. One set of register values ; has member names of the form intUserXX. The values in these stack ; frame members will be passed to the interrupt service routine when ; it is called, and will be loaded with the register values returned ; by the interrupt service routine. The other set of registers values ; has member names of the form pmUserXX. These stack frame members ; contain the original values in the registers on entry from the ; user program that called the interrupt. ; ; When we return to the original caller, we want to pass back the ; general registers as returned by the interrupt routine (and possibly ; modified by the exit handler), and the same segment registers as ; on entry, unless the interrupt routine returns a value in a segment ; register. (in this case, there must be some code in the exit routine ; to handle this). This means that when we return to the caller, we ; return the general register values from the intUserXX set of stack ; frame members, but we return the segment registers from the pmUserXX ; set of frame members. By doing it this way, we don't have to do ; any work for the case where the interrupt subfuntion doesn't require ; any parameter manipulation. NOTE however, this means that when ; manipulating register values to be returned to the user, the segment ; registers are treated opposite to the way the general registers are ; treated. For general registers, to return a value to the user, ; store it in a intUserXX stack frame member. To return a segment ; value to the user, store it in a pmUserXX stack frame member. ; ; ------------------------------------------------------- subttl NetBIOS API Mapper Initialization Routine page ; ------------------------------------------------------- ; NetBIOS API MAPPER INITIALIZATION ROUTINE ; ------------------------------------------------------- DXPMCODE segment assume cs:DXPMCODE ;-------------------------------------------------------- ; InitNetMapper -- This routine initializates the NetBIOS API mapper. ; ; Input: none ; Output: none ; Errors: none ; Uses: all registers preserved ; ; Note: This routine expects to be called late enough in the DOS ; extender initialization cycle that it can use other interrupt ; mapping functions (like INT 21h). It must be called in ; PROTECTED MODE! ; And, assumes interrupts are to be enabled. assume ds:DGROUP,es:NOTHING,ss:NOTHING public InitNetMapper InitNetMapper proc near pusha push es ; Do an installation check before doing anything else SwitchToRealMode assume ds:DGROUP,es:DGROUP FSTI mov ax,355Ch ;make sure the Int 5Ch vector int 21h ; really points somewhere assume es:NOTHING mov ax,es ;can't be installed if 0 vector or ax,bx jz inm20 push ds pop es assume es:DGROUP mov cx,(size NCB_Struc)/2 ;build a dummy NCB with an invalid mov di,offset rgbXfrBuf1 ; 7Fh (Install) command code mov bx,di xor ax,ax cld rep stosw mov [bx].NCB_Command,Install ;issue invalid request int 5Ch xor bx,bx ;assume not installed cmp al,RC_Invalid_Cmd ;if it says invalid command, then jnz inm20 ; it must be installed dec bx ;bx !=0 means NetBIOS is installed inm20: SwitchToProtectedMode FSTI or bx,bx ;skip install if no NetBIOS jnz inm20A ;net bios is there jmp inm80 ;no NetBios inm20A: ; we are going to have our net mapping layer installed. For this we need ; global memory for the post stub code. Allocate and initialize global ; memory now. mov ax,NetHeapSize ;get size of low heap call InitLowHeap ;init the low net heap jnc inm20B ;low memory successfully initialized jmp inm80 ;return with failure inm20B: ; we need to allocate a block of memory in the low heap and copy some code ; down there which would handle the POST calls from the NetWork. It is ; necessary to have a piece in global memory do the POST handling because ; DOSX might have been swapped out by the Switcher when a POST request ; comes in. mov cx, SIZE_OF_GLOBAL_NET_STUB_CODE xor dx,dx ;DX:CX has the size call AllocateLowBlock ;allocate a block in low memory jnc inm20C ;allocation succeeded jmp inm80 ;fail the initialization inm20C: ; AX has a selector pointing to the start of the block. Copy the stub routine ; down into the block. push es ;save mov [SelNetStubCode],ax ;save the selector value push ds ;save mov es,ax ;destination sel of the xfer push cs pop ds xor di,di ;destination offset lea si,NetBiosStubCode ;source offset of xfer mov cx,SIZE_OF_GLOBAL_NET_STUB_CODE ;size of the block cld rep movsb ;copy the block down pop ds ;restore our DS ; now get the real mode segment value for the selector value in AX mov bx,ax ;get selector value in BX mov ax,6 ;get base DPMI call int 31h ;CX:DX has the base address shr dx,4 ;discard last 4 bits and cx,0fh ;discarded bits were 0 shl cl,4 ;get it in MS nibble or dh,cl ;DX has the RM segment mov [SegNetStubCode],dx ;save it ; now copy the FAR address of the RMPostRtn into the stub code segment lea di,FarAddrOfRMPostRtn ;variable where address to be saved lea ax,NetBiosStubCode ;offset of the routine sub di,ax ;DI has the offset in the stub mov ax,segDXCode ;segment of real mode DosX mov es:[di][2],ax ;save the segment lea ax,RMPostRtn ;offset of the POST routine mov es:[di][0],ax ;save the offset ; patch the address 'NBS_Patch_CalFarAddr' with the address in DI mov si,NBS_Patch_CallFarAddr ;address to patch mov es:[si],di ;patch it. ; calculate the offset to the other flag bytes in the stub code area that ; we will have to access. lea di,fStubDelayNetPosting ;address when assembled lea ax, NetBiosStubCode ;address of start of routine sub di,ax ;address after move mov [AddrfStubDelayNetPosting],di ;save it ; patch the address 'NBS_Patch_fsDelayNetPosting' with the value in DI mov si,NBS_Patch_fsDelayNetPosting ;address to patch mov es:[si],di ;patch it. lea di,fStubTermNetRequests ;address when assembled sub di,ax ;address after move mov [AddrfStubTermNetRequest],di ;save it ; patch the address 'NBS_Patch_fsTermNetRequests' with the value in DI mov si,NBS_Patch_fsTermNetRequests ;address to patch mov es:[si],di ;patch it. pop es ; The stub routine in global memory has now been put in place to handle POST ; calls. We now need to hook the INT 2AH and 5CH PM vectors to trap the network ; calls. ; The network seems to be installed, hook the INT 2Ah & 5Ch PM vectors mov ax,352Ah ;get/store old Int 2Ah vector int 21h assume es:NOTHING mov word ptr lpfnOldInt2A,bx mov word ptr [lpfnOldInt2A+2],es mov ax,355Ch ;get/store old Int 5Ch vector int 21h mov word ptr lpfnOldInt5C,bx mov word ptr [lpfnOldInt5C+2],es push ds pop es push cs pop ds assume ds:NOTHING,es:DGROUP mov ax,252Ah ;set new Int 2Ah handler mov dx,offset DXPMCODE:PMIntr2A int 21h mov ax,255Ch ;set new Int 5Ch handler mov dx,offset DXPMCODE:PMIntr5C int 21h push es pop ds assume ds:DGROUP ; Allocate a selector to use for scratch purposes later call AllocateLDTSelector mov selNetScr,ax ; See if anybody wants to provide a different NetBIOS mapping table SwitchToRealMode assume ds:DGROUP,es:DGROUP FSTI ;don't need 'em disabled xor cx,cx ;subf'n zero mov es,cx ;preset address to copy to NULL mov di,cx mov ax,REPLACE_MAP_TABLE ; DOSX net extender API call to substitute alternate NETBIOS ; mapping table mov bx,VNETBIOS_DEV_ID ;VNETBIOS device ID int 2Fh ; ES:DI contains address of alternate mapping table or NULL mov cx,es ;Q: valid table pointer ? jcxz inm70 ;N: NULL...keep current table ;Y: copy table pointed to by es:di to table area (simple replace) mov ax,ds ; string move source (int 2F provided) table mov es,ax ; in ds:si, and destination ApiMapTbl in the mov ds,cx ; data segment now in es:di mov si,di mov di,offset ApiMapTbl ;ptr to table mov cx,64 ;copy over 128 byte table cld rep movsw mov ds,ax ;recall data segment inm70: SwitchToProtectedMode assume ds:DGROUP,es:DGROUP,ss:NOTHING FSTI clc jmp short inm90 inm80: stc ;tell caller we didn't install inm90: pop es popa ret InitNetMapper endp ;----------------------------------------------------------------------------- ; NetBiosStubCode ; ; DESCRIPTION This routine is actually relocated to a block of Global Memory ; obtained from the Switcher. It handles the POST calls from the ; NETBIOS layer. If DosX has been swapped out, fStubDelayPosting ; would be true and this routine would set a flag in the HCB ; to imply that the POSTing must be done. If DosX is active, this ; routine will call off to the RMPostRtn in DosX via a far call ; pointer. ; ; ENTRY: ; ES:BX - HCB ; ; EXIT: ; All registers preserved but for flags. ; ; USES: ; Flags ; ; NOTE: ; This routine will actually be copied to a global memory stub segment ; and will execute from there. However, since the routine would be moved ; while we are in protected mode, the routine is being assembled in the ; protected mode code segment. ;----------------------------------------------------------------------------- NetBiosStubCode proc far assume ds:NOTHING,es:NOTHING,ss:NOTHING FCLI ;just to be sure ; Don't post anything if in the process of terminating ;----------------------------------------------------------------------------- ; The following instruction will have to be patched after the move: ; ; cmp cs:[fStubTermNetRequests],1 ; ; we will mark the place that has to be patched. ;----------------------------------------------------------------------------- db 2eh, 80h, 3eh ;CS: CMP BYTE PTR NBS_Patch_fsTermNetRequests equ $ - NetBiosStubCode dw ? ;address to compare db 1 ;value to comapare ;----------------------------------------------------------------------------- je NBSC_post_done ; Check if posting should be delayed ;----------------------------------------------------------------------------- ; The following instruction will have to be patched after the move: ; ; cmp cs:[fStubDelayNetPosting],0;Q: delay postings ? ; ; we will mark the place that has to be patched. ;----------------------------------------------------------------------------- db 2eh, 80h, 3eh ;CS: CMP BYTE PTR NBS_Patch_fsDelayNetPosting equ $ - NetBiosStubCode dw ? ;address to compare db 0 ;value to comapare ;----------------------------------------------------------------------------- je NBSC_post_no_delay ;N: don't delay this posting ; we can do no posting. DosX has been swapped out. Set a flag in the HCB to ; imply that POSTing must be done later. or byte ptr es:[bx.HCB_Flags],HCB_DELAY ;Y: mark as delayed jmp short NBSC_post_done NBSC_post_no_delay: ;----------------------------------------------------------------------------- ; call off to RMPostRtn in DosX. We will have to patch the following ; instruction after the move. ; ; call cs:[FarAddrOfRMPostRtn] ;call routine in DosX proper ; ; we will mark the place to match ;----------------------------------------------------------------------------- db 2eh,0ffh,1eh ;CALL CS: DWORD PTR NBS_Patch_CallFarAddr equ $ - NetBiosStubCode dw ? ;call far address ;------------------------------------------------------------------------------ NBSC_post_done: riret NetBiosStubCode endp ;----------------------------------------------------------------------------; ; allocate space for some of the variables that the Stub Code uses. These ; ; will be filled in by PMODE code in the DosX. ; ;----------------------------------------------------------------------------; fStubTermNetRequests db 0 ;DosX is terminating fStubDelayNetPosting db 0 ;delay posting, DosX swapped FarAddrOfRMPostRtn dd ? ;address of the actual POST rtn SIZE_OF_GLOBAL_NET_STUB_CODE equ $ - NetBiosStubCode ;-----------------------------------------------------------------------------; DXPMCODE ends ; ------------------------------------------------------- subttl NetBIOS API Mapper Termination Routine page ; ------------------------------------------------------- ; NetBIOS API MAPPER TERMINATION ROUTINE ; ------------------------------------------------------- DXCODE segment assume cs:DXCODE ; TermNetMapper -- This routine is called when the 286 DOS extender ; is winding down so that any pending network requests from the ; protected mode application can be canceled. ; ; Input: none ; Output: none ; Errors: none ; Uses: ax,bx,cx,dx,si,di,es ; ; Note: This routine must be called in REAL MODE! assume ds:DGROUP,es:NOTHING,ss:NOTHING public TermNetMapper TermNetMapper proc near ; set a flag in the stub code to imply that DosX is terminating and no more ; POSTs to be done. mov di,[SelNetStubCode] ;selector for the stub area or di,di ;is global heap in place ? jnz @f ;yes. ret @@: SwitchToProtectedMode assume ds:DGROUP,es:DGROUP,ss:NOTHING push es mov es,di assume es:nothing ; get the address of the flag byte fStubTermNetRequest after the block was ; relocated mov di,[AddrfStubTermNetRequest] ; ES:DI has the flag byte address. Set the flag mov byte ptr es:[di],1 ;set flag to delay posting pop es assume es:dgroup ; terminating the net driver interface...no more postings allowed FSTI mov cx,size NCB_Struc / 2 mov si,offset Cancel_NCB ;cancel control block buffer mov di,si xor ax,ax ;zero fill structure cld rep stosw mov ds:[si.NCB_Command],Cancel ;Cancel command NCB ; We don't need to release the NCB/buffer(s) from the low heap because ; the entire low heap will soon be released. ; Search low heap list looking for copy of target NCB mov cx,HCB_List mov di,HCB_Header_Size ;offset of NCB in low heap block term_next: jcxz term_done mov ax,cx call GetSegmentAddress add dx,di adc bx,0 ;BX:DX = lma of low target NCB call Lma2SegOff ;BX:DX = normalized SEG:OFF dec bx ;return the same slightly unnormalized add dx,10h ; SEG:OFF that was used initially mov ds:[si.NCB_Buffer_Seg],bx ; point to NCB to cancel mov ds:[si.NCB_Buffer_Off],dx SwitchToRealMode ;also disables ints for us assume ds:DGROUP,es:DGROUP mov bx,si ;ES:BX points to cancelling NCB pushf call lpfnRmNetIsr ;do the cancel call ; return code in AL SwitchToProtectedMode assume ds:DGROUP,es:NOTHING,ss:NOTHING FSTI mov es,cx mov cx,es:[di.HCB_Next] jmp short term_next term_done: SwitchToRealMode assume ds:DGROUP,es:DGROUP FSTI ret TermNetMapper endp ; ------------------------------------------------------- DXCODE ends ; ------------------------------------------------------- subttl NetBIOS API Int 2Ah Mapper Interrupt Hook page ; ------------------------------------------------------- ; NetBIOS API INT 2Ah MAPPER INTERRUPT HOOK ; ------------------------------------------------------- DXPMCODE segment assume cs:DXPMCODE ; ------------------------------------------------------- ; PMIntr2A -- This routine traps Int 2Ah requests from a ; protected mode application. NetBIOS requests (ah = ; 1 or 4) are passed on to the Int 5Ch handler for ; further processing. Other requests are passed on ; to the next Int 2Ah handler in the interrupt chain. ; ; Input: User regs at time of interrupt ; Output: none ; Errors: none ; Uses: none ; assume ds:NOTHING,es:NOTHING,ss:NOTHING public PMIntr2A PMIntr2A proc near cld ;cya... cmp ah,1 ;we only need to map the Int 2Ah jz @f ; ah = 1 & 4 services--if it's cmp ah,4 ; not one of those, just pass it jz @f ; on down the chain... sub sp,4 ; build a stack frame push bp mov bp,sp push ax push ds mov ds,selDgroupPM assume ds:DGROUP mov ax,word ptr [lpfnOldInt2A+2] ; store previous INT 2A mov word ptr [bp+4],ax ; handler mov ax,word ptr [lpfnOldInt2A] mov word ptr [bp+2],ax pop ds assume ds:NOTHING pop ax pop bp ; SS:SP -> previous handler ;let someone else deal with it retf ; (most likely PMIntrReflector) @@: if PM_NCB_HANDLING ; ; if this is NT then we have decided we are making a NetBIOS call (es:bx points ; to an NCB in protect-mode memory). INT 0x2A, ah=1 or ah=4 just ends up calling ; the 0x5C entry point; ah is returned as 1 or 0, depending on whether an error ; is returned from 0x5C or not ; push dx mov dl,2ah else push bx ;save caller's bx mov bx,4*2Ah ;indicate we came from int 2A handler endif ; PM_NCB_HANDLING jmp short DoNetRqst ;int 2Ah/5Ch common code PMIntr2A endp ; ------------------------------------------------------- subttl NetBIOS API Int 5Ch Mapper Interrupt Hook page ; ------------------------------------------------------- ; NetBIOS API INT 5Ch MAPPER INTERRUPT HOOK ; ------------------------------------------------------- ; PMIntr5C -- This routine maps Int 5Ch (and selected Int 2Ah) ; NetBIOS requests between a protected mode application, and ; the real mode interrupt handler. ; ; Input: User regs at time of interrupt ; Output: regs as returned by interrupt handler ; Errors: ; Uses: none ; assume ds:NOTHING,es:NOTHING,ss:NOTHING public PMIntr5C PMIntr5C proc near if PM_NCB_HANDLING ; ; we no longer want to make the call through the real-mode handler, since all ; it does is make the BOP ; cld ; just in case push dx mov dl,5ch DoNetRqst: ; ; Do a sync/async NETBIOS presence check. Don't BOP for this simple case. ; Also don't do the async call because Delrina WinFax Pro hasn't initialized ; The post address in the NCB. ; cmp byte ptr es:[bx],7fh ; sync NETBIOS presence check je skip_bop cmp byte ptr es:[bx],0ffh ; async NETBIOS presence check je skip_bop ifdef WOW_x86 .386p push ds mov ds,selDgroupPM assume ds:DGROUP FBOP BOP_REDIR, SVC_NETBIOS5C, FastBop pop ds .286p else SVC SVC_NETBIOS5C endif ; WOW_x86 cmp dl,2ah jne @f ; ; this was a 0x2A call. Return ah = 0 if NetBIOS returned al = 0, else return ; ah = 1 ; sub ah,ah or al,al jz @f inc ah @@: pop dx riret skip_bop: mov al,3 ; INVALID COMMAND error mov es:[bx].ncb_retcode,al ; returned in NCB_RETCODE && al mov es:[bx].ncb_cmd_cplt,al ; and NCB_CMD_CPLT pop dx riret else cld ;cya... push bx ;save caller's bx mov bx,4*5Ch ;indicate we came from int 5C DoNetRqst label near ;start of int 2Ah/5Ch common code push ax ;move the address of the push ds ; proper real mode interrupt mov ds,selDgroupPM ; handler (2A or 5C) to global var assume ds:DGROUP push es mov ax,SEL_RMIVT OR STD_RING mov es,ax mov ax,word ptr es:[bx] mov word ptr lpfnRmNetIsr,ax mov ax,word ptr es:[bx+2] mov word ptr [lpfnRmNetIsr+2],ax pop es pop ds ;restore caller's environment assume ds:NOTHING pop ax pop bx call EnterIntHandler ;build an interrupt stack frame assume ds:DGROUP,es:NOTHING FSTI ;----------------------------------------------- ; Allocate space in the low heap for the HCB/NCB and maybe a buffer xor dx,dx mov cx,HCB_SIZE ;DX:CX = # bytes low heap required call GetEntryExitFlags ;AX=Entry flags / ES:BX -> PM NCB test al,BUFF_IN+BUFF_OUT+BUFF_CHAIN ;need to allocate a low buffer? jz i5c_alloc ; ; RLF 06/09/93 ; ; from the command type, we think we have a buffer address and size. If either ; of these is 0, then we actually don't have a buffer; skip it ; mov ah,al ; set default no buffer and al,not (BUFF_IN or BUFF_OUT) mov dx,es:[bx.NCB_Buffer_Off] or dx,es:[bx.NCB_Buffer_Seg] jz i5c_alloc mov dx,es:[bx.NCB_Length] or dx,dx jz i5c_alloc xor dx,dx ; restore dx to 0 mov al,ah ; restore buffer flags add cx,es:[bx.NCB_Length] ;if so, add in it's length adc dx,0 add cx,1fh ;allow space to align buffer adc dx,0 ; on a paragraph boundry and cx,not 0fh test al,BUFF_CHAIN ;a 2nd weird-o buffer? jz i5c_alloc add cx,word ptr es:[bx.NCB_CallName] ;yes, add in it's len also adc dx,0 add cx,1fh ;allow space to align buffer adc dx,0 ; on a paragraph boundry and cx,not 0fh i5c_alloc: push ax ;save entry/exit flags FCLI ;treat allocate as critical section ------------ call AllocateLowBlock ;allocate conventional memory for jnc @f ; HCB/NCB and maybe buffer Debug_Out "Low heap allocation failed!" pop ax ;clear stack mov byte ptr [bp].intUserAX,RC_Resources mov es:[bx.NCB_RetCode],RC_Resources mov es:[bx.NCB_Cmd_Cplt],RC_Resources jmp i5c_done @@: ; Copy the PM NCB to the low heap and add our extra HCB fields mov es,ax xor di,di ;es:di -> low heap block cld stosw ;HCB_Handle mov ax,bx stosw ;HCB_PM_NCB_Off mov ax,[bp].pmUserES stosw ;HCB_PM_NCB_Seg mov ax,HCB_List stosw ;HCB_Next xor ax,ax stosw ;HCB_Flags = 0 mov HCB_List,es ;link HCB to head of list FSTI ;----------------------------------------------- push ds mov ds,[bp].pmUserES assume ds:NOTHING errnz ;if odd # bytes, can't just movsw mov si,bx ;ES:DI->low NCB, DS:SI->PM NCB mov cx,size NCB_Struc / 2 rep movsw pop ds assume ds:DGROUP ; Update the interrupt handler's registers to point to the low NCB mov ax,es call GetSegmentAddress add dx,HCB_Header_Size adc bx,0 ;BX:DX = lma of low NCB pop ax ;refresh entry flags push ax push bx ;save lma of NCB push dx call Lma2SegOff ;BX:DX = normalized SEG:OFF of low NCB dec bx ;we want to do a negative offset on the add dx,10h ; NCB segment, so un-normalize it some mov [bp].intUserES,bx ;point int handler's ES:BX to low NCB mov [bp].intUserBX,dx ; If this is a cancel request, find the target NCB in the low heap test al,BUFF_CANCEL ;cancel request? jz i5c_not_cancel mov di,HCB_Header_Size ;ES:DI -> low heap Cancel NCB FCLI ;don't want list changing while looking -------- call FindTargetNCB ;BX:DX = SEG:OFF of target NCB FSTI ;----------------------------------------------- if DEBUG ;------------------------------------------------------------ jnc @f Debug_Out "FindTargetNCB didn't!" @@: endif ;DEBUG -------------------------------------------------------- jc @f mov es:[di.NCB_Buffer_Off],dx ;point cancel NCB to low mov es:[di.NCB_Buffer_Seg],bx ; heap target NCB @@: i5c_not_cancel: pop dx ;restore lma of NCB pop bx ; If necessary, update NCB buffer pointer(s) and copy buffer(s) to low heap pop ax ;recover entry flags test al,BUFF_IN+BUFF_OUT+BUFF_CHAIN ;a buffer to point to? jnz @f jmp i5c_no_buf_in @@: add dx,size NCB_Struc + 0fh ;get lma of buffer, rounded up adc bx,0 ; to the next higher paragraph and dx,not 0fh push ds mov ds,[bp].pmUserES mov si,[bp].pmUserBX ;DS:SI -> PM NCB assume ds:NOTHING push bx push dx call Lma2SegOff ;BX:DX = SEG:OFF of low buffer mov di,HCB_Header_Size ;ES:DI -> low NCB mov es:[di.NCB_Buffer_Off],dx mov es:[di.NCB_Buffer_Seg],bx pop dx pop bx test al,BUFF_IN+BUFF_CHAIN ;actually need to copy buffer? jz i5c_buf_in_done mov cx,ds:[si.NCB_Length] ;CX = buffer len lds si,dword ptr ds:[si.NCB_Buffer_Off] ;DS:SI -> buffer push ax xor ax,ax call CopyBuffer ;copies DS:SI to lma BX:DX len CX pop ax test al,BUFF_CHAIN jz i5c_buf_in_done add dx,es:[di.NCB_Length] ;BX:DX = lma of 2nd low heap buffer adc bx,0 add dx,0fh adc bx,0 and dx,not 0fh push bx ;update low heap NCB with SEG:OFF push dx ; of 2nd buffer call Lma2SegOff mov word ptr es:[di.NCB_CallName+2],dx ;2nd buffer loc stored mov word ptr es:[di.NCB_CallName+4],bx ; at callname + 2 pop dx pop bx mov ds,[bp].pmUserES mov si,[bp].pmUserBX ;DS:SI -> PM NCB mov cx,word ptr ds:[si.NCB_CallName] ;CX = buffer len lds si,dword ptr ds:[si.NCB_CallName+2] ;DS:SI -> buffer xor ax,ax call CopyBuffer ;copies DS:SI to lma BX:DX len CX i5c_buf_in_done: pop ds assume ds:DGROUP i5c_no_buf_in: ; Switch to real mode, and load the mapped real mode registers. SwitchToRealMode ;also disables ints assume ss:DGROUP ; --------------- START OF REAL MODE CODE ------------------------------ pop es pop ds assume ds:NOTHING,es:NOTHING popa ;restore all the other registers ; If this is a NoWait command, hook the mapped NCB to point to our post ; routine. At this time ES:BX -> mapped NCB test byte ptr es:[bx.NCB_Command],NoWait jz @f push ax ;save ; ; RLF 06/09/93 ; ; although this is an async command, there may be no post address (app just ; polls return code until it goes non-0xff). In this case, don't set up our ; asynchronous notification routine ; mov ax,es:[bx.NCB_Post_Off] or ax,es:[bx.NCB_Post_Seg] jz no_post_routine assume ss:DGROUP ;ss has DOSX's data seg mov ax,[SegNetStubCode] ;get segment of stub code ; the address of the stub code that will handle the POST is AX:0. Save this ; in the HCB. mov word ptr es:[bx.NCB_Post_Off],0 mov word ptr es:[bx.NCB_Post_Seg],ax no_post_routine: pop ax ;restore @@: or byte ptr es:[bx.HCB_FLAGS],HCB_ISSUED ; Invoke the appropriate real mode interrupt handler (2Ah or 5Ch), ; reestablish our stack frame with the handler's returned registers, ; and then back to protected mode call lpfnRmNetIsr ;exectue real mode interrupt handler pushf FCLI pusha push ds push es mov bp,sp ;restore stack frame pointer mov ax,es:[bx.HCB_Handle] ;recover selector to current NCB/buff push ax SwitchToProtectedMode assume ds:DGROUP,es:NOTHING,ss:NOTHING ; --------------- START OF PROTECTED MODE CODE ------------------------- ; With some network drivers, and some NoWait commands, the operation may ; get 'posted' even before the driver IRETs from the issue call. If this ; has happened, the HCB_POSTED flag will be set. In this case, the caller's ; NCB and (possibly) buffer has already been updated, so we just discard ; the low heap block and exit. If the operation hasn't been posted already, ; we copy back the updated NCB info, and maybe a buffer. Note that interrupts ; are disabled, so we don't get 'posted' half way through this operation-- ; that would be bad. pop ax ;handle (selector) of low heap block mov es,ax mov di,HCB_Header_Size ;es:di -> low heap NCB test byte ptr es:[di.HCB_Flags],HCB_POSTED ;already posted? jnz i5c_release ; yes, just discard and byte ptr es:[di.HCB_Flags],not HCB_ISSUED ;so post rtn knows ;we updated already push ax ;save handle for later call UpdateNCB ;update the caller's NCB call GetEntryExitFlags ;AX=Exit Flags / ES:BX->PM NCB test es:[bx.NCB_Command],NoWait ;don't copy buff now if NoWait jnz i5c_no_buf_out test al,BUFF_OUT jz i5c_no_buf_out ; ; RLF 06/09/93 ; ; although the flags for this command say we have an output buffer, we may ; not have one - address or length is 0; check it out ; mov ax,es:[bx.NCB_Buffer_Off] or ax,es:[bx.NCB_Buffer_Seg] jz i5c_no_buf_out mov ax,es:[bx.NCB_Length] or ax,ax jz i5c_no_buf_out pop ax ;handle to low block back push ax call CopyBufferOut ;copy low heap buffer to pm app buffer i5c_no_buf_out: ; If this was a Wait operation (or NoWait that failed), we are finished with ; the low heap block and can release it now. pop ax ;recover handle to low heap block test es:[bx.NCB_Command],NoWait ;if Wait, go release now jz i5c_release cmp es:[bx.NCB_RetCode],RC_Pending jz i5c_done ; Most NetBIOS implementations seem to (correctly) set the RetCode to ; RC_Pending on NoWait requests. However, it seems that some Novell ; NetBIOS implementations can return RetCode == 00 but Cmd_Cplt == ; RC_Pending (FFh). So, if it is a NoWait request, and RetCode isn't ; Pending, also check the Cmd_Cplt code. cmp es:[bx.NCB_Cmd_Cplt],RC_Pending jz i5c_done Debug_Out "NoWait cmd with non Pending retcode!" i5c_release: push ds ;make sure es != low heap block sel pop es ; (else FreeLowBlock will GP fault) call DeLink ;DeLink HCB/NCB/Buffers from lnk list call FreeLowBlock ;free the low heap block ; Finished! (at least for now) Restore caller's regs/stack and return i5c_done: mov ax,[bp].pmUserBX ;restore possibly modified BX to mov [bp].intUserBX,ax ; PM NCB offset call LeaveIntHandler riret endif ; if PM_NCB_HANDLING PMIntr5C endp ; ------------------------------------------------------- DXPMCODE ends ; ------------------------------------------------------- subttl NetBIOS API Mapper Post Routine page ; ------------------------------------------------------- ; NetBIOS API MAPPER POST ROUTINE ; ------------------------------------------------------- ;******************************************************************************* ;* ;* The code from here on down is only used if we are switching between real ;* and protect mode when making NetBIOS requests. It is ifdef'd out for WOW ;* because we now BOP the NetBIOS requests without switching modes ;* ;******************************************************************************/ ;ife PM_NCB_HANDLING DXCODE segment assume cs:DXCODE ; ------------------------------------------------------- ; RMPostRtn -- This REAL MODE routine is invoked by the network ; software when a NoWait NetBIOS command completes. This ; routine must update the applications copy of the NCB, ; possibly copy a buffer of data to the application, and ; possibly invoke the application's own post routine. ; ; Note, this will now be called when it is OK to POST the request ; back to the application. The Stub Code in global mrmory makes ; sure that this is OK to do. ; ; Input: ; Output: ; Errors: ; Uses: assume ds:NOTHING,es:NOTHING,ss:NOTHING public RMPostRtn RMPostRtn proc far FCLI ;just to be sure cld ;cya... push ax push bx push es push ds ; NBP assumes ds saved, greaseballs IFDEF ROM SetRMDataSeg ELSE mov ds,selDgroup ENDIF assume ds:DGROUP ; Allocate a new stack frame, and then switch to the reflector stack ; frame. mov regUserSP,sp mov regUSerSS,ss IFDEF ROM push ds pop ss ELSE mov ss,selDgroup ENDIF mov sp,pbReflStack sub pbReflStack,CB_STKFRAME ;adjust pointer to next stack frame FIX_STACK push regUserSS ;save current stack loc on our stack push regUserSP ; so we can restore it later push es:[bx.HCB_Handle] ;selector to low heap block ; We are now running on our own stack, so we can switch into protected mode. SwitchToProtectedMode ;destroys ax ; --------------- START OF PROTECTED MODE CODE ------------------------- pop ax ;ax = selector to low heap block call NetBiosPostRoutine ;do the actual posting pop regUserSP ;recover previous stack location pop regUserSS SwitchToRealMode ; Switch back to real mode. ; --------------- START OF REAL MODE CODE ------------------------------ ; Switch back to the original stack, deallocate the interrupt stack frame, ; and return to the network software CHECK_STACK mov ss,regUserSS mov sp,regUserSP add pbReflStack,CB_STKFRAME pop ds ; give ds back to NBP/XNS pop es pop bx pop ax ret RMPostRtn endp DXCODE ends ; ------------------------------------------------------- subttl NetBIOS API Mapper Utility Routines page ; ------------------------------------------------------- ; NetBIOS API MAPPER UTILITY ROUTINES ; ------------------------------------------------------- DXPMCODE segment assume cs:DXPMCODE ; ------------------------------------------------------- ; NetBiosPostRoutine -- local routine ; This PROTECT MODE routine is called when the network ; software completes a NoWait NetBIOS command. This ; routine must update the applications copy of the NCB, ; possibly copy a buffer of data to the application, and ; possibly invoke the application's own post routine. ; ; Input: ax --> selector to low heap block ; Output: ; Errors: ; Uses: ax,bx,es assume ds:DGROUP,es:NOTHING,ss:NOTHING public NetBiosPostRoutine NetBiosPostRoutine proc near IFNDEF WOW_x86 pusha else .386p pushad push fs push gs .286p endif ; Update the protected mode copy of the NCB and copy buffer if required push ax ;handle (selector) of low heap block call UpdateNCB ;always update the caller's NCB mov es,ax mov bx,HCB_Header_Size ;ES:BX -> low heap NCB les bx,dword ptr es:[bx.HCB_PM_NCB_Off] ;ES:BX -> PM NCB call GetExitFlags2 ;AX=Exit Flags test al,BUFF_OUT jz postsub_no_buf ; ; RLF 06/09/93 ; ; once more unto the breach dear friends: although we think this command has ; an output buffer, the app may think otherwise; let's check... ; mov ax,es:[bx.NCB_Buffer_Off] or ax,es:[bx.NCB_Buffer_Seg] jz postsub_no_buf mov ax,es:[bx.NCB_Length] or ax,ax jz postsub_no_buf pop ax ;handle to low block back push ax call CopyBufferOut ;copy low heap buffer to pm app buffer postsub_no_buf: ; Release the low heap space, unless the HCB_ISSUED flag is set (meaning ; that the net driver called us before returning from the initial Int 5Ch). ; In that case, the low heap block will be released by the Int 5Ch mapper. pop ax ;recover handle to low heap block push ax push es mov es,ax mov di,HCB_Header_Size or byte ptr es:[di.HCB_Flags],HCB_POSTED ;mark as posted pop es ; Invoke the user's PM post routine, if there is one - AL=retcode, ES:BX->NCB mov ax,es:[bx.NCB_Post_Off] ;did user specify a post routine? or ax,es:[bx.NCB_Post_Seg] jz postsub_done mov [NBPSp],sp rpushf ;build iret frame for user's push cs ; routine to return to us push offset postsub_ret mov al,es:[bx.NCB_RetCode] ;pass ret code in al push es:[bx.NCB_Post_Seg] ;invoke the user's post routine push es:[bx.NCB_Post_Off] retf ; PM app's post routine returns here when finished postsub_ret: mov ax,SEL_DXDATA OR STD_RING mov ds,ax mov sp,[NBPSp] postsub_done: pop ax mov es,ax test byte ptr es:[di.HCB_Flags],HCB_ISSUED ;still in Int 5C code? jnz postsub_no_release ; yes, don't release push ds ;make sure es != low heap block sel pop es ; (else FreeLowBlock will GP fault) call DeLink ;DeLink HCB/NCB/Buffers from lnk list call FreeLowBlock ;free the low heap block postsub_no_release: IFNDEF WOW_x86 popa ELSE .386p pop gs pop fs popad .286p ENDIF ret NetBiosPostRoutine endp ; ------------------------------------------------------- ; DelayNetPostings -- This function is called when NetBIOS completions ; are to be delayed. We simply set a flag that causes the async ; post routine not to post to the application. ; ; Input: none ; Output: none ; Errors: none ; Uses: none assume ds:DGROUP,es:NOTHING,ss:NOTHING public DelayNetPosting DelayNetPosting proc near ; Make sure posting is delayed. We need to set a flag in the StubCode area. push es ;save push di mov di,[SelNetStubCode] ;selector for the stub area or di,di ;did we copy to global memory ? jz DelayNetPostingRet ;no, nothing to do. mov es,di ; get the address of the flag byte fStubDelayNetPosting after the block was ; relocated mov di,[AddrfStubDelayNetPosting] ; ES:DI has the flag byte address. Set the flag mov byte ptr es:[di],1 ;set flag to delay posting DelayNetPostingRet: pop di pop es ;restore ret DelayNetPosting endp ; ------------------------------------------------------- ; ResumeNetPostings -- This function is called when completed NetBIOS ; postings can be resumed to the application. We traverse the ; list of NetBIOS requests, and 'post' the application on any that ; completed while posting were delayed. ; ; Input: none ; Output: none ; Errors: none ; Uses: none assume ds:DGROUP,es:NOTHING,ss:NOTHING public ResumeNetPosting ResumeNetPosting proc near push es push di push bx ; used by NetBiosPostRoutine push ax ; set a flag in the StubCode area to imply that POSTing need not be delayed. mov di,[SelNetStubCode] ;selector for the stub area or di,di ;global heap in place ? jnz dummy1 jmp ResumeNetPostingRet ;no. dummy1: mov es,di ; get the address of the flag byte fStubDelayNetPosting after the block was ; relocated mov di,[AddrfStubDelayNetPosting] ; ES:DI has the flag byte address. ReSet the flag mov byte ptr es:[di],0 ;reset the flag FCLI ;protect access to linked list mov cx,HCB_List mov di,HCB_Header_Size ;offset of NCB in low heap block resume_next: jcxz resume_done mov es,cx mov cx,es:[di.HCB_Next] test byte ptr es:[di.HCB_Flags],HCB_DELAY ;Has this one completed? jz resume_next ; no, skip it ;Y: this packet was delayed...post it NOW ! mov ax,es:[di.HCB_Handle] ;selector to low heap block FSTI call NetBiosPostRoutine ;post the NCB finally FCLI ; *** modification warning *** ; note: block has just been de-linked from list, so we MUST ; get the pointer to the next block before NetBiosPostRoutine ; is called (which calls DeLink)! jmp short resume_next resume_done: FSTI ResumeNetPostingRet: pop ax pop bx pop di pop es ret ResumeNetPosting endp ; ------------------------------------------------------ ; CopyBufferOut -- This routine copies a buffer from the low heap ; block up to the PM app's buffer area. ; ; Input: AX = Selector to low heap block ; ES:BX -> PM NCB ; Output: none ; Errors: none ; Uses: none assume ds:DGROUP,es:NOTHING public CopyBufferOut CopyBufferOut proc near pusha mov cx,es:[bx.NCB_Buffer_Seg] or cx,es:[bx.NCB_Buffer_Off] jz CBO_Buffer_Is_Null push ds mov di,bx ;ES:DI -> PM NCB call GetSegmentAddress ;BX:DX = lma of low heap block lds si,dword ptr es:[di.NCB_Buffer_Off] ;DS:SI -> PM buffer assume ds:NOTHING add dx,size NCB_Struc + HCB_Header_Size + 0fh adc bx,0 and dx,not 0fh ;BX:DX = lma of low heap buffer mov cx,es:[di.NCB_Length] ;CX = buffer length mov al,1 call CopyBuffer ;copies from lma BX:DX to DS:SI, len CX pop ds assume ds:DGROUP CBO_Buffer_Is_Null: popa ret CopyBufferOut endp ; ------------------------------------------------------ ; CopyBuffer -- This routine copies a buffer of length CX ; from DS:SI to the lma in BX:DX _or_ from the lma in ; BX:DX to DS:SI. ; ; Input: AX = direction flag, Z = from DS:SI -> lma, ; NZ = from lma -> DS:SI ; BX:DX = lma of source or dest ; CX = length in bytes ; DS:SI = pointer to source or dest ; Output: none ; Errors: none ; Uses: none assume ds:NOTHING,es:NOTHING public CopyBuffer CopyBuffer proc near pusha push ds push es rpushf FCLI ; Setup a selector/descriptor for the linear memory address push ax ;save direction flag push ds mov ds,selDgroupPM ;temp dgroup addressability assume ds:DGROUP mov ax,selNetScr ;our scratch selector to use dec cx ;length to limit cCall NSetSegmentDscr, pop ds assume ds:NOTHING inc cx ;back to length ; If necessary, adjust the length so we don't fault due by overrunning the ; DS segment mov bx,ds ;get limit for DS segment lsl bx,bx sub bx,si ;less the DS offset inc bx ; (limit is len - 1) cmp bx,cx ;at least CX bytes left in segment? jae @f mov cx,bx ; no, only do # remaining @@: ; Copy the buffer xor di,di ;AX:DI is now SEL:OFF to lma pop bx ;recover direction flag or bx,bx jnz @f mov es,ax ;from DS:SI -> AX:DI, almost ready jmp short cb_copy @@: xchg si,di ;from AX:DI -> DS:SI, adjust push ds ; regs for movs instruction pop es mov ds,ax cb_copy: cld shr cx,1 ;byte count to words, low bit to CY rep movsw jnc @f movsb ;get any odd byte @@: npopf pop es pop ds popa ret CopyBuffer endp ; ------------------------------------------------------ ; DeLink -- This routine will unlink a HCB/NCB/Buffer low heap ; block from the HCB_List linked list. ; ; Input: AX = selector to block to unlink ; Output: block unlinked ; Uses: none assume ds:DGROUP,es:NOTHING public DeLink DeLink proc near push bx push cx push es mov bx,HCB_Header_Size cmp ax,HCB_List ;special case likely condition jnz ul_search mov es,ax ;ES:BX -> block to unlink mov cx,es:[bx.HCB_Next] ;block is first in linked list mov HCB_List,cx jmp short ul_done ul_search: mov es,HCB_List ;ES:BX -> first block in list ul_loop: mov cx,es:[bx.HCB_Next] ;is this just before the block? cmp ax,cx jz ul_got_it mov es,cx ; no, try the next one jmp short ul_loop ul_got_it: push es ;okay, cut the selected block mov es,cx ; out of the linked list mov cx,es:[bx.HCB_Next] pop es mov es:[bx.HCB_Next],cx ul_done: pop es pop cx pop bx ret DeLink endp ; ------------------------------------------------------ ; FindTargetNCB -- This routine searches the low memory heap ; to locate an NCB pointed to by another user PM NCB. ; ; Input: ES:DI -> Cancel NCB pointing to PM target NCB ; Output: BX:DX = RM SEG:OFF of target NCB in low heap ; Error: CY if target NCB can't be found ; Uses: none assume ds:DGROUP,es:NOTHING public FindTargetNCB FindTargetNCB proc near push ax push cx push di push es mov bx,es:[di.NCB_Buffer_Seg] ;get selector:offset of PM mov dx,es:[di.NCB_Buffer_Off] ; target NCB to cancel ; Search low heap list looking for copy of target NCB mov cx,HCB_List mov di,HCB_Header_Size ;offset of NCB in low heap block ft_next: jcxz ft_err mov es,cx ;ES:DI -> first/next HCB/NCB in list cmp bx,es:[di.HCB_PM_NCB_Seg] ;is this the one? jnz ft_not_it cmp dx,es:[di.HCB_PM_NCB_Off] jz ft_got_it ft_not_it: ; no, get ptr to next one mov cx,es:[di.HCB_Next] jmp short ft_next ft_got_it: ; ES:DI now points at the low heap copy of the target NCB, convert to SEG:OFF mov ax,es call GetSegmentAddress add dx,di adc bx,0 ;BX:DX = lma of low target NCB call Lma2SegOff ;BX:DX = normalized SEG:OFF dec bx ;return the same slightly unnormalized add dx,10h ; SEG:OFF that was used initially clc ;found it! jmp short ft_done ft_err: stc ;couldn't find the target ?! ft_done: pop es pop di pop cx pop ax ret FindTargetNCB endp ;-------------------------------------------------------- ; GetEntryExitFlags -- This routine looks up the entry/exit mapping ; flags for the current NetBIOS command. ; ; Input: user regs on stack frame ; Output: AX = flags ; ES:BX -> caller's PM NCB ; Errors: none ; Uses: assume ds:DGROUP,es:NOTHING,ss:NOTHING public GetEntryExitFlags GetEntryExitFlags proc near mov es,[bp].pmUserES ;point ES:BX to pm app's NCB mov bx,[bp].pmUserBX ; and get command code GetExitFlags2 label near push di mov al,es:[bx.NCB_Command] and al,7Fh cbw mov di,ax ;map NCB command code to API mov al,ApiMapTbl[di] ; mapping code via ApiMapTbl shr ax,2 ;use map code to select entry/exit mov di,ax ; flags via EntryExitCode mov al,EntryExitFlags[di] pop di ret GetEntryExitFlags endp ; ------------------------------------------------------ ; UpdateNCB -- This routine updates the user's PM NCB copy from the ; low heap real mode copy. ; ; Input: AX = selector pointing to low heap HCB/NCB ; Output: User's PM NCB updated ; Errors: none ; Uses: none assume ds:NOTHING,es:NOTHING,ss:NOTHING public UpdateNCB UpdateNCB proc near push ax push cx push si push di push ds push es mov ds,ax mov si,HCB_Header_Size ;DS:SI -> low heap NCB les di,dword ptr [si.HCB_PM_NCB_Off] ;ES:DI -> protect mode NCB mov al,[si.NCB_Command] ;want to check the command code later and al,not NoWait cld movsw movsw ;copy command, retcode, LSN, Num add si,4 ;skip the buffer pointer add di,4 movsw ;move the length mov cx,34 / 2 ;len of callname, name, rto, sto (words) cmp al,ChainSend ;funkey chain send command? jnz @f add si,16 ; yes, skip callname add di,16 sub cx,16 / 2 @@: rep movsw ;move name, rto, sto, maybe callname add si,4 ;skip the post address add di,4 mov cx,16 / 2 ;move the rest rep movsw pop es pop ds pop di pop si pop cx pop ax ret UpdateNCB endp ; ------------------------------------------------------- DXPMCODE ends ;endif ; ife PM_NCB_HANDLING DXDATA segment my_sp dw ? DXDATA ends DXPMCODE segment assume cs:DXPMCODE ;******************************************************************************* ;* ;* HandleNetbiosAnr ;* ;* Called when a simulated h/w interrupt for net callback functions occurs. ;* Checks if the call is a PM netbios ANR. If it is, we get the NCB ;* information and call the PM post routine ;* ;* ENTRY Nothing ;* ;* EXIT Nothing ;* ;* RETURNS Nothing ;* ;* ASSUMES Nothing ;* ;******************************************************************************/ public HandleNetbiosAnr HandleNetbiosAnr proc assume cs:DXPMCODE assume ds:DGROUP assume es:nothing assume ss:nothing ; ; perform a BOP to discover if this is a protect mode netbios ANR. If it is then ; es and bx will point to the NCB ; push ds push SEL_DXDATA OR STD_RING pop ds ifdef WOW_x86 .386p FBOP BOP_REDIR, SVC_NETBIOSCHECK, FastBop .286p else SVC SVC_NETBIOSCHECK endif ; WOW_x86 jnz @f jmp chain_previous_int ; not PM Netbios ANR @@: ; ; this is a PM Netbios ANR. Save state and call the post routine. There MUST be ; a post routine if we're here ; IFNDEF WOW_x86 pusha ELSE .386p pushad ; save all 32 bits push fs push gs .286p ENDIF push es ifdef WOW_x86 .386p FBOP BOP_REDIR, SVC_NETBIOS5CINTERRUPT, FastBop .286p else SVC SVC_NETBIOS5CINTERRUPT endif ; WOW_x86 ; ; save the stack pointer - apparently some apps will RETF, not IRET from the ; ANR. NB - this ISR cannot be re-entered since we only have the one previous ; stack pointer saved. This should be okay as long as the EOI is issued at the ; end of the ISR ; mov my_sp,sp ; ; perform a fake interrupt to the PM post routine. ES:BX point at the NCB, AL is ; the return code. Post routine will IRET back (supposedly) ; mov al,es:[bx.NCB_RetCode] ; pass ret code in al pushf call dword ptr es:[bx.NCB_Post_Off] ; ; restore our data segment and stack pointer, lest the app didn't IRET ; mov ax,SEL_DXDATA OR STD_RING mov ds,ax mov sp,my_sp ; ; restore the interrupted state, then perform a BOP to reset the PIC and clean ; up any interrupt state ; pop es IFNDEF WOW_x86 popa ELSE .386p pop gs pop fs popad .286p ENDIF ; ; this BOP will clear the emulated PICs (sends non-specific EOIs), and cause the ; next NET interrupt to be generated, if one is queued ; ifdef WOW_x86 .386p FBOP BOP_REDIR, SVC_RDRINTACK2, FastBop .286p else SVC SVC_RDRINTACK2 endif ; WOW_x86 ; ; restore the rest of the interrupted context and resume ; pop ds riret chain_previous_int: push word ptr OldInt76+2 ; selector of previous handler push word ptr OldInt76 ; offset of previous handler push bp mov bp,sp mov ds,[bp+6] ; retrieve interrupted ds pop bp retf 2 ; chain previous handler, removing space ; used for ds HandleNetbiosAnr endp public HookNetBiosHwInt HookNetBiosHwInt proc near ; ; Save everything!! ; pusha push ds push es mov ax,3576h ; get old handler int 21h mov word ptr [OldInt76],bx mov word ptr [OldInt76 + 2],es mov dx,SEL_NBPMCODE OR STD_RING mov ds,dx mov dx,offset HandleNetbiosAnr mov ah,25h int 21h ; set new handler pop es pop ds popa ret HookNetBiosHwInt endp DXPMCODE ends ;**************************************************************** end