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94 lines
2.9 KiB
Plaintext
94 lines
2.9 KiB
Plaintext
;__________________________________________________________________________________________________
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;
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; File: NetBootUtil.a
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;
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; Contains: Network booting utility routines.
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;
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; Written by: Patrick Dyson
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;
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; Copyright © 1989 by Apple Computer, Inc. All rights reserved.
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;
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; Change History (most recent first):
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;
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; <3> 12/28/89 SWC Fixed header and set tabs to 4.
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; <2> 12/19/89 PD Adding to bbs
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; <1.1> 12/12/89 PWD Added support for self-authenticating images
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; <1.0> 10/30/89 PWD Adding to EASE
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;__________________________________________________________________________________________________
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CASE OBJ ; save case for C linker
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myExtFSFilter
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PROC EXPORT ; imported by netBoot.c
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MOVEM.L A0-A4/D1-D2, -(SP) ; savem
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CMP.B #$0F,ioTrap+1(A0) ; is this a MountVol call?
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BNE @NotOurs
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MOVE.W IODrvNum(A0), D0 ; pick up drive
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CMP.W #4, D0 ; is this for us?
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BNE @NotOurs
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;
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; go find the drive queue entry
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;
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LEA DrvQHdr,A2 ; get the drive queue header
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MOVE.L qHead(A2),A1 ; start with first drive
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CheckDrv
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CMP.W dqDrive(A1),D0 ; our drive?
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BEQ.S GotDrvNum ; yep, cruise
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CMP.L qTail(A2),A1 ; no, are we at the end of the queue?
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BEQ.S @NotOurs ; yes, we're hosed
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MOVE.L qLink(A1),A1 ; point to next queue element
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BRA.S CheckDrv ; go check it.
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GotDrvNum ; in A1
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CMP.W #dFSID, dQFSID(A1) ; ours?
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BNE @NotOurs
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MOVE.L dStorage(A1), D0 ; pick up driver globals (on end of entry)
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MOVE.L A1, A4 ; save drive entry pointer
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BEQ @Error
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MOVE.L D0, A2 ; get globals pointer
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SUB #ioQElSize,SP ; make a queue element
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MOVE.L SP,A0 ; A0 -> queue element
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MOVE #mountSysVol,csCode(A0) ; set control code
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MOVE dProtoRefNum(A2),ioRefNum(A0) ; set driver refNum
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_Control
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BEQ.S @Good ; branch if no error
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ADD #ioQElSize, SP ; restore stack
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BRA @ControlError ; punt if error
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@Good MOVE.L ioBuffer(A0), A1 ; pick up VCB pointer
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MOVE.L A1, DefVCBPtr ; set as default volume
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MOVE.L WDCBsPtr, A3
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MOVE.L A1, WDVCBPtr+2(A3) ;
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MOVEQ #2, D0 ; FSRtDirID
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MOVE.L D0, WDDirID+2(A3) ;
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CLR.L WDCatHint+2(A3)
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CLR.L WDProcID+2(A3)
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MOVE.L ioMisc(A0), A1 ; pick up drive queue pointer
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MOVE dQFSID(A1), dQFSID(A4) ; set drive queue entry fsid
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MOVE dQRefNum(A1), dQRefNum(A4) ; set driver refnum to handle calls
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MOVE.B -3(A1), -3(A4) ; set flags
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SUBQ #4, A1 ; point to buffer start
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EXG A0, A1 ; set up for _Dispos
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_DisposPtr ; nuke it
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CLR.L dStorage(A4) ; wipe out reference to our storage
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MOVE.L doldToExtFS(A2), ToExtFS ; restore ToExtFS (unhook ourselves)
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MOVEQ #0, D0 ; set no error
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ADD #ioQElSize, SP ; restore stack
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BRA.S @Leave ; outta' here
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@ControlError
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@Leave
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@NotOurs
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MOVEM.L (SP)+, A0-A4/D1-D2 ; restorem
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RTS
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ENDP
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END
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