myUnitNum equ 52 myDRefNum equ ~myUnitNum ; Our register conventions: ; A2 = fake dqe; A3 = dce; A4 = copied driver link A6,#-$32 movem.l A2-A4/D3,-(SP) ; Now I copy all this stuff under BufPtr (because this current location will disappear) sub.l #(BufPtrCopyEnd-BufPtrCopy),$10C ; BufPtr move.l $10C,A4 ; ... into A4 ; Copy the driver and image as one chunk lea BufPtrCopy,A0 move.l A4,A1 move.l #(BufPtrCopyEnd-BufPtrCopy),D0 dc.w $A02E ; BlockMove ; Install the driver in the unit table move.l #myDRefNum,D0 dc.w $A43D ; _DrvrInstall ReserveMem bne error ; Get DCE handle of installed driver move.l $11C,A0 ; UTableBase add.l #myUnitNum*4,A0 move.l (A0),A3 ; Lock it down move.l A3,A0 dc.w $A029 ; _HLock ; Populate the empty DCE that DrvrInstall left us move.l (A3),A0 ; A0 = dce ptr move.l A4,0(A0) ; dCtlDriver is pointer (not hdl) move.w 0(A4),D0 ; drvrFlags and.w #~$0040,D0 ; Clear dRAMBased bit (to treat dCtlDriver as a pointer) move.w D0,4(A0) ; dCtlFlags ; Copy these other values that apparently the Device Mgr forgets move.w 2(A4),$22(A0) ; drvrDelay to dCtlDelay move.w 4(A4),$24(A0) ; drvrEMask to dCtlEMask move.w 6(A4),$26(A0) ; drvrMenu to dCtlMenu ; Open the driver lea -$32(A6),A0 bsr clearblock lea DrvrNameString,A1 move.l A1,$12(A0) ; IOFileName dc.w $A000 ; _Open bne error ; Attempt to read from the driver ; lea -$32(A6),A0 ; bsr clearblock ; move.w #myDRefNum,$18(A0) ; ioRefNum ; move.l #$200,$24(A0) ; ioByteCount ; dc.w $A002 ; bne error ; Create a DQE move.l #$16,D0 dc.w $A71E ; _NewPtr ,Sys,Clear add.l #4,A0 ; has some cheeky flags at negative offset move.l A0,A2 ; Point our caller to the fake dqe move.l 4+12(A6),A1 move.l A2,(A1) ; Find a free drive number (nicked this code from BootUtils.a:AddMyDrive) LEA $308,A0 ; [DrvQHdr] MOVEQ #4,D3 ; start with drive number 4 CheckDrvNum MOVE.L 2(A0),A1 ; [qHead] start with first drive CheckDrv CMP.W 6(A1),D3 ; [dqDrive] does this drive already have our number? BEQ.S NextDrvNum ; yep, bump the number and try again. CMP.L 6(A0),A1 ; [qTail] no, are we at the end of the queue? BEQ.S GotDrvNum ; if yes, our number's unique! Go use it. MOVE.L 0(A1),A1 ; [qLink] point to next queue element BRA.S CheckDrv ; go check it. NextDrvNum ; this drive number is taken, pick another ADDQ.W #1,D3 ; bump to next possible drive number BRA.S CheckDrvNum ; try the new number GotDrvNum ; Populate the DQE move.l #$80080000,-4(A2) ; secret flags, see http://mirror.informatimago.com/next/developer.apple.com/documentation/mac/Files/Files-112.html move.w #1,4(A2) ; qType move.w #(DiskImageEnd-DiskImage)&$FFFF,$C(A2) ; dQDrvSz move.w #(DiskImageEnd-DiskImage)>>16,$E(A2) ; dQDrvSz2 move.w #0,$A(A2) ; dQFSID should be for a native fs ; Into the drive queue (which will further populate the DQE) move.l A2,A0 ; A0 = DQE ptr move.w D3,D0 swap.w D0 ; D0.H = drive number move.w #myDRefNum,D0 ; D0.L = driver refnum dc.w $A04E ; _AddDrive bne error ; Make our call able to work! (Fuck, this is ugly) ; lea NaughtyFSQHSave,A0 ; move.l $3E2,(A0) ; lea NaughtyFSQHKiller,A0 ; move.l A0,$3E2 ; Disable FSQueueSync move.w $360,-(SP) ; FSBusy move.l $362,-(SP) ; FSQHead move.l $366,-(SP) ; FSQTail ; MountVol and pray lea -$32(A6),A0 bsr clearblock move.w D3,$16(A0) ; ioVRefNum = ioDrvNum = the drive number dc.w $A00F ; _MountVol move.l (SP)+,$366 ; FSQTail move.l (SP)+,$362 ; FSQHead move.w (SP)+,$360 ; FSBusy ; Tell Elliot that we made it through ; dc.w $A9FF ; Clean up our stack frame movem.l (SP)+,A2-A4/D3 unlk A6 rts error move.w #$DDDD,D0 dc.w $A9FF clearblock clr.w $0(A0) clr.w $2(A0) clr.w $4(A0) clr.w $6(A0) clr.w $8(A0) clr.w $a(A0) clr.w $c(A0) clr.w $e(A0) clr.w $10(A0) clr.w $12(A0) clr.w $14(A0) clr.w $16(A0) clr.w $18(A0) clr.w $1a(A0) clr.w $1c(A0) clr.w $1e(A0) clr.w $20(A0) clr.w $22(A0) clr.w $24(A0) clr.w $26(A0) clr.w $28(A0) clr.w $2a(A0) clr.w $2c(A0) clr.w $2e(A0) clr.w $30(A0) rts DrvrNameString dc.b 11, ".netRamDisk" gDriveNum dc.w 0 ; code on this side is for start only, and stays in the netBOOT driver globals until released BufPtrCopy ; code on this side gets copied beneath BufPtr (is that the best place??) ; Shall we start with a driver? DrvrBase dc.w $4F00 ; dReadEnable dWritEnable dCtlEnable dStatEnable dNeedLock dc.w 0 ; delay dc.w 0 ; evt mask dc.w 0 ; menu dc.w DrvrOpen-DrvrBase dc.w DrvrPrime-DrvrBase dc.w DrvrControl-DrvrBase dc.w DrvrStatus-DrvrBase dc.w DrvrClose-DrvrBase dc.b 11, ".netRamDisk" ; a0=iopb, a1=dce on entry to all of these... ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; DrvrOpen move.w #0,$10(A0) ; ioResult rts ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; DrvrPrime movem.l A0-A1/D0-D2,-(SP) cmp.b #2,$7(A0) ; ioTrap == aRdCmd bne.s notRead ; D1 = image offset move.l $10(A1),D1 ; Device Mgr gives us dCtlPosition ; D0 = number of bytes move.l $24(A0),D0 ; ioReqCount move.l D0,$28(A0) ; -> ioActCount ; Advance the pointer move.l D1,D2 add.l D0,D2 ; calculate new position move.l D2,$10(A1) ; -> dCtlPosition ; Do the dirty (we are just about to trash A0, so use it first) move.w #0,$10(A0) ; ioResult move.l $20(A0),A1 ; ioBuffer lea DiskImage,A0 add.l D1,A0 dc.w $A02E ; BlockMove bra.s primeFinish notRead cmp.b #3,7(A0) ; ioTrap == aRdCmd bne.s primeFinish ; D1 = image offset move.l $10(A1),D1 ; Device Mgr gives us dCtlPosition ; D0 = number of bytes move.l $24(A0),D0 ; ioReqCount move.l D0,$28(A0) ; -> ioActCount ; Advance the pointer move.l D1,D2 add.l D0,D2 ; calculate new position move.l D2,$10(A1) ; -> dCtlPosition ; Do the dirty (we are just about to trash A0, so use it first) move.w #0,$10(A0) ; ioResult move.l $20(A0),A0 ; ioBuffer lea DiskImage,A1 add.l D1,A1 dc.w $A02E ; BlockMove primeFinish movem.l (SP)+,A0-A1/D0-D2 bra DrvrFinish ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; DrvrControl ; move.w #$2222,D0 ; dc.w $A9FF move.w #-18,$10(A0) ; ioResult bra DrvrFinish ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; DrvrStatus cmp.w #6,$1A(A0) beq.s status_fmtLstCode cmp.w #8,$1A(A0) beq.s status_drvStsCode bra.s status_unknown status_fmtLstCode ; tell them about our size move.l A2,-(SP) move.w #1,$1C(A0) move.l $1C+2(A0),A2 move.l #(DiskImageEnd-DiskImage),0(A2) move.l #$40000000,4(A2) move.l (SP)+,A2 move.w #0,$10(A0) ; ioResult = statusErr bra DrvrFinish status_drvStsCode ; tell them about some of our flags move.w #0,$1C(A0) ; csParam[0..1] = track no (0) move.l #80080000,$1C+2(A0) ; csParam[2..5] = same flags as dqe move.w #0,$10(A0) ; ioResult = noErr bra DrvrFinish status_unknown move.w $1A(A0),D0 ; dodgy, for debugging add.w #$3000,D0 dc.w $A9FF move.w #-18,$10(A0) ; ioResult bra DrvrFinish ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; DrvrClose move.w #$4444,D0 dc.w $A9FF move.w #0,$10(A0) ; ioResult rts ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; DrvrFinish move.w 6(A0),D1 ; iopb.ioTrap btst #9,D1 ; noQueueBit bne.s DrvrNoIoDone move.l $8FC,-(SP) ; jIODone DrvrNoIoDone rts DiskImage INCLUDE "systools607.dsk.a" DiskImageEnd BufPtrCopyEnd