510 lines
17 KiB
Plaintext
510 lines
17 KiB
Plaintext
myUnitNum equ 52
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myDRefNum equ ~myUnitNum
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Code
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cmp.l #1,4(SP)
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beq getBootBlocks
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cmp.l #2,4(SP)
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beq getSysVol
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cmp.l #3,4(SP)
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beq mountSysVol
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move.l #-1,d0
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rts
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getBootBlocks
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lea DiskImage,A0
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move.l 8(SP),A1 ; Inside the global struct...
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add.l #$BA,A1 ; ...is an element for the structured part of the boot blocks
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move.l #138,D0 ; ...of this length
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dc.w $A22E ; _BlockMoveData
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; If these boot blocks are executable (from offset 2), then the 138 bytes of
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; declarative data copied by the netBOOT driver are not enough. We edit the boot
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; blocks with a stub that copies the entire 1k into place. System 7 needs this.
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move.b 6(A1),D0 ; BBVersion
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cmp.b #$44,D0
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beq.s executableBB
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and.b #$C0,D0
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cmp.b #$C0,D0
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beq.s executableBB
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bra return
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executableBB ; Need to leave bytes 6,7 intact
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move.l #$60000004,2(A1) ; BB+2: BRA.W BB+8
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move.w #$4EB9,8(A1) ; BB+8: JSR fixBB
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lea fixBB,A0
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move.l A0,10(A1)
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move.l A1,A0 ; Clear the icache with a BlockMove
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move.l #138,D0
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dc.w $A02E ; _BlockMove
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bra return
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fixBB ; The BB stub JSRs to here
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move.l (SP)+,A1
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sub.l #14,A1 ; "Rewind" to the start of the BB
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lea DiskImage,A0 ; Replace stub BB with correct BB
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move.l #$400,D0
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dc.w $A02E ; _BlockMove
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jmp 2(A1) ; Jump to the fixed-up BB
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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getSysVol
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; Our register conventions:
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; A2 = fake dqe; A3 = dce; A4 = copied driver
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link A6,#-$32
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movem.l A2-A4/D3,-(SP)
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; Now I copy all this stuff under BufPtr (because this current location will disappear)
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lea Code,A0
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dc.w $A021 ; _GetPtrSize
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; Save a copy of the image size for later
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move.l D0,D1
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sub.l #DiskImage-Code,D1
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lea DiskImageSize,A1
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move.l D1,(A1)
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; Make space in "high memory" for the combined driver and disk image
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sub.l #BufPtrCopy-Code,D0
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sub.l D0,$10C ; BufPtr
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move.l $10C,A4 ; ... into A4
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; Copy the driver and image as one chunk
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lea BufPtrCopy,A0
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move.l A4,A1
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dc.w $A22E ; _BlockMoveData
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; Truncate this block to reduce heap fragmentation
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lea Code,A0
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move.l #BufPtrCopy-Code,D0
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dc.w $A020 ; _SetPtrSize
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; Install the driver in the unit table
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move.l #myDRefNum,D0
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dc.w $A43D ; _DrvrInstall ReserveMem
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bne error
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; Get DCE handle of installed driver
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move.l $11C,A0 ; UTableBase
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add.l #myUnitNum*4,A0
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move.l (A0),A3
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; Lock it down
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move.l A3,A0
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dc.w $A029 ; _HLock
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; Populate the empty DCE that DrvrInstall left us
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move.l (A3),A0 ; A0 = dce ptr
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move.l A4,0(A0) ; dCtlDriver is pointer (not hdl)
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move.w 0(A4),D0 ; drvrFlags
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and.w #~$0040,D0 ; Clear dRAMBased bit (to treat dCtlDriver as a pointer)
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move.w D0,4(A0) ; dCtlFlags
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; Copy these other values that apparently the Device Mgr forgets
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move.w 2(A4),$22(A0) ; drvrDelay to dCtlDelay
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move.w 4(A4),$24(A0) ; drvrEMask to dCtlEMask
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move.w 6(A4),$26(A0) ; drvrMenu to dCtlMenu
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; Open the driver
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lea -$32(A6),A0
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bsr clearblock
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lea DrvrNameString,A1
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move.l A1,$12(A0) ; IOFileName
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dc.w $A000 ; _Open
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bne error
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; Create a DQE
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move.l #$16,D0
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dc.w $A71E ; _NewPtr ,Sys,Clear
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bne error
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add.l #4,A0 ; has some cheeky flags at negative offset
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move.l A0,A2
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; Point our caller to the fake dqe
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move.l 4+12(A6),A1
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move.l A2,(A1)
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; Find a free drive number (nicked this code from BootUtils.a:AddMyDrive)
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LEA $308,A0 ; [DrvQHdr]
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MOVEQ #4,D3 ; start with drive number 4
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CheckDrvNum
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MOVE.L 2(A0),A1 ; [qHead] start with first drive
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CheckDrv
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CMP.W 6(A1),D3 ; [dqDrive] does this drive already have our number?
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BEQ.S NextDrvNum ; yep, bump the number and try again.
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CMP.L 6(A0),A1 ; [qTail] no, are we at the end of the queue?
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BEQ.S GotDrvNum ; if yes, our number's unique! Go use it.
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MOVE.L 0(A1),A1 ; [qLink] point to next queue element
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BRA.S CheckDrv ; go check it.
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NextDrvNum
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; this drive number is taken, pick another
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ADDQ.W #1,D3 ; bump to next possible drive number
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BRA.S CheckDrvNum ; try the new number
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GotDrvNum
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; Populate the DQE
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move.l #$80080000,-4(A2) ; secret flags, see http://mirror.informatimago.com/next/developer.apple.com/documentation/mac/Files/Files-112.html
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move.w #1,4(A2) ; qType
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move.w #0,$A(A2) ; dQFSID should be for a native fs
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move.l DiskImageSize,D0
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swap D0
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move.l D0,$C(A2) ; dQDrvSz/dQDrvSz2
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lea gDQEAddr,A0
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move.l A2,(A0)
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; Into the drive queue (which will further populate the DQE)
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move.l A2,A0 ; A0 = DQE ptr
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move.w D3,D0
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swap.w D0 ; D0.H = drive number
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move.w #myDRefNum,D0 ; D0.L = driver refnum
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dc.w $A04E ; _AddDrive
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bne error
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; Save this most precious knowledge for later
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lea gDriveNum,A0
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move.w D3,(A0)
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; Work around a bug in the .netBOOT ToExtFS hook
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bsr fixDriveNumBug
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; Clean up our stack frame
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movem.l (SP)+,A2-A4/D3
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unlk A6
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bra return
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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mountSysVol
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link A6,#-$32
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movem.l A2-A4/D3,-(SP)
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lea gDriveNum,A0
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move.w (A0),D3
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; System 7 needs MountVol to return the right vRefNum
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move.l $366,A0 ; Steal existing PB from FSQHead
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; Set aside the FS queue to stop MountVol deadlocking
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move.w $360,-(SP) ; FSBusy
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move.l $362,-(SP) ; FSQHead
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move.l $366,-(SP) ; FSQTail
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clr.w $360
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clr.l $362
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clr.l $366
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; MountVol
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bsr clearblock
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move.w D3,$16(A0) ; ioVRefNum = ioDrvNum = the drive number
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dc.w $A00F ; _MountVol
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bne error
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; Restore the FS queue
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move.l (SP)+,$366
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move.l (SP)+,$362
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move.w (SP)+,$360
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; Tattle about the DQE and VCB
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move.l 4+12(A6),A1
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move.l $356+2,A0 ; VCBQHdr.QHead (maybe I should be clever-er)
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move.l A0,(A1)
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move.l 4+16(A6),A1
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lea gDQEAddr,A0
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move.l (A0),(A1)
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movem.l (SP)+,A2-A4/D3
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unlk A6
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return
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move.l #0,d0
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rts
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error
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dc.w $A9C9
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; The .netBOOT driver installs a ToExtFS hook that triggers on _MountVol
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; and calls our mountSysVol. The hook routine checks that the drive number
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; is 4. On machines with >2 existing drives, this check fails, and we
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; never get called (i.e. Mini vMac).
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; The solution is to head patch the .netBOOT ToExtFS hook. We use a
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; one-shot patch on _MountVol to gain control after the hook is installed
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; but before it is called, and install our new hook.
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bystanderTrap equ $A00F ; _MountVol
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gTheirDriveNum dc.w 0
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gOrigBystanderTrap dc.l 0
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gOrigExtFS dc.l 0
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NetBootName dc.b 8, ".netBOOT", 0
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fixDriveNumBug
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; Get the .netBOOT driver refnum (only to search for the right drive)
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lea -$32(A6),A0 ; Use our caller's stack frame
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bsr clearblock
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lea NetBootName,A1
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move.l A1,$12(A0) ; IOFileName
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dc.w $A000 ; _Open
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bne error
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move.w $18(A0),D0 ; Result in IORefNum
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; Search for the drive with that number in dQRefNum
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lea $308,A1 ; DrvQHdr
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lea 2(A1),A0 ; Treat qHead like qLink.
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nbFindLoop move.l (A0),A0 ; follow qLink
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cmp.w 8(A0),D0 ; is the dQRefNum the .netBOOT driver?
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beq.s nbFound ; then we found the .netBOOT drive
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cmp.l 6(A1),A0 ; have we reached qTail?
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beq error ; then we didn't find the .netBOOT drive
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bra.s nbFindLoop
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nbFound move.w 6(A0),D0 ; Get dqDrive (drive number)
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; Save drivenum in a global for our patch to use
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lea gTheirDriveNum,A0
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move.w D0,(A0)
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; Only install the patch if we need to
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cmp.w #4,D0 ; A drivenum of 4 will work anyway
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bne installOneshotPatch
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rts
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; Install a self-disabling patch on _MountVol
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installOneshotPatch
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move.w #bystanderTrap,D0 ; Save original in a global
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dc.w $A346 ; _GetOSTrapAddress
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lea gOrigBystanderTrap,A1
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move.l A0,(A1)
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move.w #bystanderTrap,D0 ; Install
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lea oneshotPatch,A0
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dc.w $A247 ; _SetOSTrapAddress
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rts
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; Our _MountVol patch
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oneshotPatch
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clr.l -(SP)
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movem.l D0/D1/A0/A1,-(SP) ; Save "OS trap" registers
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move.l $3F2,A0 ; Save the ToExtFS hook in a global to call later
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lea gOrigExtFS,A1
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move.l A0,(A1)
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lea toExtFSPatch,A0 ; Install the ToExtFS head patch
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move.l A0,$3F2
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lea gOrigBystanderTrap,A0 ; Remove this patch from _MountVol
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move.l (A0),A0
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move.l A0,16(SP)
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move.w #bystanderTrap,D0
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dc.w $A047 ; _SetTrapAddress
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movem.l (SP)+,D0/D1/A0/A1
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rts
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; Our head patch on the ToExtFS hook
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toExtFSPatch
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movem.l A0-A4/D1-D2,-(SP) ; Save the same registers at the real ToExtFS hook
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cmp.b #$F,$6+1(A0) ; Check for a _MountVol call (IOTrap+1)
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bne.s hookReturn
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lea gTheirDriveNum,A1 ; Check for the CORRECT drive number,
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move.w (A1),D0 ; instead of erroneously checking for 4.
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cmp.w $16(A0),D0 ; IODrvNum
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bne.s hookReturn
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lea gOrigExtFS,A1 ; Rejoin the ToExtFS hook AFTER the buggy code
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move.l (A1),A1
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hookScan add.l #2,A1 ; Scan for "lea DrvQHdr,A2" (or similar)
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cmp.w #$308,2(A1)
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bne.s hookScan
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jmp (A1) ; and enter at that point
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hookReturn movem.l (SP)+,A0-A4/D1-D2
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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clearblock
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move.w #$32/2-1,D0
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.loop clr.w (A0)+
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dbra D0,.loop
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lea -$32(A0),A0
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rts
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DrvrNameString
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dc.b 11, ".netRamDisk"
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gDriveNum dc.w 0
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gDQEAddr dc.l 0
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; code on this side is for start only, and stays in the netBOOT driver globals until released
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BufPtrCopy
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; code on this side gets copied beneath BufPtr (is that the best place??)
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; Shall we start with a driver?
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DrvrBase
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dc.w $4F00 ; dReadEnable dWritEnable dCtlEnable dStatEnable dNeedLock
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dc.w 0 ; delay
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dc.w 0 ; evt mask
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dc.w 0 ; menu
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dc.w DrvrOpen-DrvrBase
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dc.w DrvrPrime-DrvrBase
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dc.w DrvrControl-DrvrBase
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dc.w DrvrStatus-DrvrBase
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dc.w DrvrClose-DrvrBase
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dc.b 11, ".netRamDisk"
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; a0=iopb, a1=dce on entry to all of these...
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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DrvrOpen
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move.w #0,$10(A0) ; ioResult
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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DrvrPrime
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movem.l A0-A1/D0-D1,-(SP)
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cmp.b #2,$7(A0) ; ioTrap == aRdCmd
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bne.s notRead
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; D1 = image offset
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move.l $10(A1),D1 ; Device Mgr gives us dCtlPosition
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; D0 = number of bytes
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move.l $24(A0),D0 ; ioReqCount
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move.l D0,$28(A0) ; -> ioActCount
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; Do the dirty (we are just about to trash A0, so use it first)
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move.w #0,$10(A0) ; ioResult
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move.l $20(A0),A1 ; ioBuffer
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lea DiskImage,A0
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add.l D1,A0
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dc.w $A22E ; _BlockMoveData
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bra.s primeFinish
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notRead
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cmp.b #3,7(A0) ; ioTrap == aRdCmd
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bne.s primeFinish
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; D1 = image offset
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move.l $10(A1),D1 ; Device Mgr gives us dCtlPosition
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; D0 = number of bytes
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move.l $24(A0),D0 ; ioReqCount
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move.l D0,$28(A0) ; -> ioActCount
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; Do the dirty (we are just about to trash A0, so use it first)
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move.w #0,$10(A0) ; ioResult
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move.l $20(A0),A0 ; ioBuffer
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lea DiskImage,A1
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add.l D1,A1
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dc.w $A22E ; _BlockMoveData
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primeFinish
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movem.l (SP)+,A0-A1/D0-D1
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bra DrvrFinish
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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DrvrControl
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move.w #-18,$10(A0) ; ioResult
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bra DrvrFinish
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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DrvrStatus
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cmp.w #6,$1A(A0)
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beq.s status_fmtLstCode
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cmp.w #8,$1A(A0)
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beq.s status_drvStsCode
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bra.s status_unknown
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status_fmtLstCode ; tell them about our size
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move.l A2,-(SP)
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move.w #1,$1C(A0)
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move.l $1C+2(A0),A2
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move.l DiskImageSize,0(A2)
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move.l #$40000000,4(A2)
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move.l (SP)+,A2
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move.w #0,$10(A0) ; ioResult = noErr
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bra DrvrFinish
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status_drvStsCode ; tell them about some of our flags
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move.w #0,$1C(A0) ; csParam[0..1] = track no (0)
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move.l #80080000,$1C+2(A0) ; csParam[2..5] = same flags as dqe
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move.w #0,$10(A0) ; ioResult = noErr
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bra DrvrFinish
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status_unknown
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move.w $1A(A0),D0 ; dodgy, for debugging
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add.w #$3000,D0
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dc.w $A9C9
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move.w #-18,$10(A0) ; ioResult
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bra DrvrFinish
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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DrvrClose
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move.w #$4444,D0
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dc.w $A9C9
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move.w #0,$10(A0) ; ioResult
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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DrvrFinish
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move.w 6(A0),D1 ; iopb.ioTrap
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btst #9,D1 ; noQueueBit
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bne.s DrvrNoIoDone
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move.l $8FC,-(SP) ; jIODone
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DrvrNoIoDone
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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DiskImageSize
|
|
dc.l 0
|
|
|
|
align 9
|
|
DiskImage
|