mirror of
https://github.com/elliotnunn/NetBoot.git
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Big refactor aimed at RAM usage
More gross inefficiencies to be squashed
This commit is contained in:
Elliot Nunn
parent
abf78881be
commit
c898af28d3
504
ChainLoader.a
504
ChainLoader.a
@ -5,246 +5,15 @@ serverBufSize equ 32
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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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; This is the entry point, which the ROM jumps to with one of three
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; selectors. This whole block of code lives inside the system heap, in a
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; block that the ROM code forgets ever to free. So we simply drop our
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; driver here, and relegate the one-time init code to the end of the
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; block.
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getBootBlocks
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; Now is the time to install our DRVR because we are guaranteed an opportunity to boot if we don't fuck up.
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link A6,#-$32
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movem.l A2-A4/D3-D7,-(SP)
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; Copy the DRVR -> A2
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move.l #DrvrEnd-DrvrBase,D0
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lea DrvrBase,A0
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bsr InstallInSysHeap
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move.l A0,A2
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; Patch the server address into the DRVR code
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move.l 12(A6),A0 ; global pointer
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move.l 24(A0),D0 ; AddrBlock
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lea gSaveAddr-DrvrBase(A2),A0
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move.b #10,15(A0) ; hardcode DDP protocol ID
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move.b D0,13(A0) ; socket
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lsr.w #4,D0
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lsr.w #4,D0
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move.b D0,11(A0) ; node
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swap D0
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move.w D0,7(A0) ; network
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; Patch the disk image name and size into the DRVR code
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; bsr BootPicker ; A0 = pstring ptr
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; lea gNumBlks-DrvrBase(A2),A1
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; move.l -4(A0),(A1) ; the size is underneath the pstring ptr
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; move.l -4(A0),D6 ; D6 = block count, needed for DQE
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; lea gQFilename-DrvrBase(A2),A1 ; A1 = dest
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; moveq.l #1,D0
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; add.b (A0),D0
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; dc.w $A22E ; _BlockMoveData
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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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; That call created a DCE. Find and lock.
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move.l $11C,A0 ; UTableBase
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move.l myUnitNum*4(A0),A0
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dc.w $A029 ; _HLock
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move.l (A0),A0
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; Populate the empty DCE that DrvrInstall left us
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move.l A2,0(A0) ; dCtlDriver is pointer (not hdl)
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move.w 0(A2),D0 ; get DRVR.drvrFlags
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bclr #6,D0 ; Clear dRAMBased bit (to treat dCtlDriver as a pointer)
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move.w D0,4(A0) ; set DCE.dCtlFlags
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move.w 2(A2),$22(A0) ; drvrDelay to dCtlDelay
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move.w 4(A2),$24(A0) ; drvrEMask to dCtlEMask
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move.w 6(A2),$26(A0) ; drvrMenu to dCtlMenu
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; Open the driver
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lea -$32(SP),SP
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move.l SP,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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lea $32(SP),SP
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; Create a DQE
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move.l #$16,D0
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dc.w $A71E ; _NewPtr ,Sys,Clear
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add.l #4,A0 ; has some cheeky flags at negative offset
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move.l A0,A3
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lea gDQEAddr,A0
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move.l A3,(A0)
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; Populate the DQE
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move.l D6,D0 ; needs fixing for Ruby Slipper
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lsl.l #5,D0 ; convert to bytes
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lsl.l #4,D0
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swap D0
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move.l D0,$C(A3) ; dQDrvSz/dQDrvSz2
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move.l #$00080000,-4(A3) ; secret flags, see http://mirror.informatimago.com/next/developer.apple.com/documentation/mac/Files/Files-112.html
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move.w #1,4(A3) ; qType
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move.w #0,$A(A3) ; dQFSID should be for a native fs
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; Into the drive queue (which will further populate the DQE)
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bsr findFreeDriveNum ; get drvnum in D0
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lea gDriveNum,A0
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move.w D0,(A0)
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swap D0
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move.w #myDRefNum,D0 ; D0.H = drvnum, D0.L = drefnum
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move.l D0,D3 ; we need this in a sec
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move.l A3,A0
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dc.w $A04E ; _AddDrive
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; Open our socket
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lea -$32(SP),SP
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move.l SP,A0
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bsr clearblock
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move.w #-10,$18(A0) ; ioRefNum = .MPP
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move.w #248,$1A(A0) ; csCode = openSkt
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move.b #10,$1C(A0) ; socket = 10, same as ATBOOT uses
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lea DrvrSockListener-DrvrBase(A2),A2
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move.l A2,$1E(A0) ; listener
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dc.w $A004 ; _Control
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lea $32(SP),SP
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; Get the real 1024k of boot blocks to a temp location
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; (it will eventually get trashed, but we have time)
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lea 4096(A5),A4 ; above BootGlobals
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lea -$32(SP),SP
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move.l SP,A0
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bsr clearblock
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move.l D3,22(A0) ; IOVRefNum=drvnum, IORefNum=drefnum
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move.l A4,32(A0) ; IOBuffer
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move.l #1024,36(A0) ; IOReqCount = 2 blocks
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move.l #0,46(A0) ; IOPosOffset = 0
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move.w #1,44(A0) ; IOPosMode = from start
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dc.w $A002 ; _Read
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lea $32(SP),SP
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; Put the boot blocks in netBOOT's global data structure as requested
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move.l A4,A0
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move.l 12(A6),A1
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lea $BA(A1),A1
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move.l #$138,D0
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dc.w $A22E ; _BlockMoveData
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move.l A1,A0 ; A0 = truncated BBs
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move.l A4,A1 ; A1 = full-length BBs
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bsr HealInjuredBootBlocks
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; Clean up our stack frame
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movem.l (SP)+,A2-A4/D3-D7
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unlk A6
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move.l #0,D0
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rts
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getSysVol ; pointless call :(
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move.l #0,D0
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rts
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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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move.l #0,d0
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rts
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error
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move.w #$7777,D0
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dc.w $A9C9
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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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findFreeDriveNum ; and return it in D0. Free to trash the usual registers
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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,D0 ; 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),D0 ; [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,D0 ; 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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rts
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DrvrNameString
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dc.b 8, ".LANDisk", 0
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gDriveNum dc.w 0
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gDQEAddr dc.l 0
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bra OneTimeInitCode
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dc.l 'NtBt'
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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@ -259,7 +28,7 @@ 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 8, ".LANDisk", 0
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DrvrName dc.b 8, ".LANDisk", 0
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g
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gNumBlks dc.l 0 ; the source of all truth
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@ -797,6 +566,241 @@ DrvrEnd
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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OneTimeInitCode
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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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; Now is the time to install our DRVR because we are guaranteed an opportunity to boot if we don't fuck up.
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link A6,#-$32
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movem.l A2-A4/D3-D7,-(SP)
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; Patch the server address into the DRVR code (TODO: concentrate all global patches here)
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move.l 12(A6),A0 ; global pointer
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move.l 24(A0),D0 ; AddrBlock
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lea gSaveAddr,A0
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move.b #10,15(A0) ; hardcode DDP protocol ID
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move.b D0,13(A0) ; socket
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lsr.w #4,D0
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lsr.w #4,D0
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move.b D0,11(A0) ; node
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swap D0
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move.w D0,7(A0) ; network
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; Patch the disk image name and size into the DRVR code
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; bsr BootPicker ; A0 = pstring ptr
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; lea gNumBlks,A1
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; move.l -4(A0),(A1) ; the size is underneath the pstring ptr
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; move.l -4(A0),D6 ; D6 = block count, needed for DQE
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; lea gQFilename,A1 ; A1 = dest
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; moveq.l #1,D0
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; add.b (A0),D0
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; dc.w $A22E ; _BlockMoveData
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; Install the driver in the unit table
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lea DrvrBase,A0
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move.l #myDRefNum,D0
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dc.w $A43D ; _DrvrInstall ReserveMem
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; That call created a DCE. Find and lock.
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move.l $11C,A0 ; UTableBase
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move.l myUnitNum*4(A0),A0
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dc.w $A029 ; _HLock
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move.l (A0),A0
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; Populate the empty DCE that DrvrInstall left us (forget fields related desk accessories)
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lea DrvrBase,A2
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move.l A2,0(A0) ; dCtlDriver = driver pointer (not handle)
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move.w 0(A2),4(A0) ; dCtlFlags = drvrFlags
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; Open the driver
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lea -$32(SP),SP
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move.l SP,A0
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bsr clearblock
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lea DrvrName,A1
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move.l A1,$12(A0) ; IOFileName
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dc.w $A000 ; _Open
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lea $32(SP),SP
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; Create a DQE. The fate of this exact DQE is to be copied and deleted by ROM code.
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move.l #$16,D0
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dc.w $A71E ; _NewPtr ,Sys,Clear
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add.l #4,A0 ; has some cheeky flags at negative offset
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move.l A0,A3
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lea gDQEAddr,A0
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move.l A3,(A0)
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; Populate the DQE
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move.l D6,D0 ; needs fixing for Ruby Slipper
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lsl.l #5,D0 ; convert to bytes
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lsl.l #4,D0
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swap D0
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move.l D0,$C(A3) ; dQDrvSz/dQDrvSz2
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move.l #$00080000,-4(A3) ; secret flags, see http://mirror.informatimago.com/next/developer.apple.com/documentation/mac/Files/Files-112.html
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move.w #1,4(A3) ; qType
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move.w #0,$A(A3) ; dQFSID should be for a native fs
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; Into the drive queue (which will further populate the DQE)
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bsr findFreeDriveNum ; get drvnum in D0
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lea gDriveNum,A0
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move.w D0,(A0)
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swap D0
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move.w #myDRefNum,D0 ; D0.H = drvnum, D0.L = drefnum
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move.l D0,D3 ; we need this in a sec
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move.l A3,A0
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dc.w $A04E ; _AddDrive
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; Open our socket
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lea -$32(SP),SP
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move.l SP,A0
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bsr clearblock
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move.w #-10,$18(A0) ; ioRefNum = .MPP
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move.w #248,$1A(A0) ; csCode = openSkt
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move.b #10,$1C(A0) ; socket = 10, same as ATBOOT uses
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lea DrvrSockListener,A2
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move.l A2,$1E(A0) ; listener
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dc.w $A004 ; _Control
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lea $32(SP),SP
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; Get the real 1024k of boot blocks to a temp location
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; (it will eventually get trashed, but we have time)
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lea 4096(A5),A4 ; above BootGlobals
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lea -$32(SP),SP
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move.l SP,A0
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bsr clearblock
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move.l D3,22(A0) ; IOVRefNum=drvnum, IORefNum=drefnum
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move.l A4,32(A0) ; IOBuffer
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move.l #1024,36(A0) ; IOReqCount = 2 blocks
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move.l #0,46(A0) ; IOPosOffset = 0
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move.w #1,44(A0) ; IOPosMode = from start
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dc.w $A002 ; _Read
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lea $32(SP),SP
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; Put the boot blocks in netBOOT's global data structure as requested
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move.l A4,A0
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move.l 12(A6),A1
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lea $BA(A1),A1
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move.l #$138,D0
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dc.w $A22E ; _BlockMoveData
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move.l A1,A0 ; A0 = truncated BBs
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move.l A4,A1 ; A1 = full-length BBs
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bsr HealInjuredBootBlocks
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; Clean up our stack frame
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movem.l (SP)+,A2-A4/D3-D7
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unlk A6
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move.l #0,D0
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rts
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getSysVol ; pointless call :(
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move.l #0,D0
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rts
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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
|
||||
lea gDQEAddr,A0
|
||||
move.l (A0),(A1)
|
||||
|
||||
lea Code,A0
|
||||
move.l #OneTimeInitCode-Code,D0
|
||||
dc.w $A020 ; Cut the unnecessary code off me
|
||||
|
||||
movem.l (SP)+,A2-A4/D3
|
||||
unlk A6
|
||||
|
||||
move.l #0,d0
|
||||
rts
|
||||
|
||||
error
|
||||
move.w #$7777,D0
|
||||
dc.w $A9C9
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
gDriveNum dc.w 0
|
||||
gDQEAddr dc.l 0
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
clearblock
|
||||
move.w #$32/2-1,D0
|
||||
.loop clr.w (A0)+
|
||||
dbra D0,.loop
|
||||
lea -$32(A0),A0
|
||||
rts
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
findFreeDriveNum ; and return it in D0. Free to trash the usual registers
|
||||
; Find a free drive number (nicked this code from BootUtils.a:AddMyDrive)
|
||||
LEA $308,A0 ; [DrvQHdr]
|
||||
MOVEQ #4,D0 ; start with drive number 4
|
||||
.CheckDrvNum
|
||||
MOVE.L 2(A0),A1 ; [qHead] start with first drive
|
||||
.CheckDrv
|
||||
CMP.W 6(A1),D0 ; [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,D0 ; bump to next possible drive number
|
||||
BRA.S .CheckDrvNum ; try the new number
|
||||
.GotDrvNum
|
||||
rts
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
HealInjuredBootBlocks ; patch the BBs to fix themselves if executed
|
||||
|
||||
; Args: A0 = truncated boot blocks (138b), A1 = correct boot blocks (1024b)
|
||||
@ -858,25 +862,3 @@ HealInjuredBootBlocks ; patch the BBs to fix themselves if executed
|
||||
jmp 2(A1) ; Jump to the fixed-up BB
|
||||
|
||||
.gFullLoc dc.l 0 ; Stuff addr of full-length BB in here
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
InstallInSysHeap
|
||||
; takes A0/D0 as args, returns ptr in A0
|
||||
movem.l A0/D0,-(SP)
|
||||
dc.w $A51E ; NewPtr ,Sys
|
||||
movem.l (SP)+,A1/D0 ; now A1=old, A0=new
|
||||
exg A0,A1 ; now A1=new, A0=old
|
||||
move.l D0,-(SP)
|
||||
dc.w $A02E ; _BlockMove
|
||||
move.l (SP)+,D0
|
||||
exg A1,A0 ; now A1=old, A0=new
|
||||
|
||||
subq.l #1,D0
|
||||
.wipeloop move.b $99,(A1)+
|
||||
dbra D0,.wipeloop
|
||||
|
||||
rts
|
||||
|
||||
|
||||
BootPicker include "BootPicker.a"
|
||||
|
||||
Loading…
Reference in New Issue
Block a user