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239 lines
7.4 KiB
Plaintext
239 lines
7.4 KiB
Plaintext
;__________________________________________________________________________________________________
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;
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; File: netBoot.a
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;
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; Contains: This is the driver that is pointed to (refnum) by the drive queue element
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; installed at _NetBootInit time. It will be called (Read) to read in the
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; first two blocks of the disk (the "boot blocks");
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;
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; The idea is that we find an, or the, preffered boot protocol and open its
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; boot driver. We then issue a getBootImage control call to it. If these
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; are successful we go on to execute the boot image, replacing ourselves
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; with the driver that it returns.
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;
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; We accept:
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; read - the os initial read for the blocks
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; control - an "eject" call
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; open,
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; close - our init and ending routines
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;
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; Written by: Patrick Dyson
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;
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; Copyright © 1989-1990, 1992 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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; <SM2> 11/5/92 SWC Changed INCLUDEs to a LOAD of StandardEqu.d.
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; <7> 2/20/90 PWD Fixed dynamic heap sizing to re-init the app heap and
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; update applzone and thezone appropriately.
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; <6> 2/1/90 PWD Fixed dynamic heap sizing to re-init the app heap and update
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; applzone and thezone appropriately
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; <5> 1/2/90 PWD Adding back in support for an eject control call.
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; <4> 12/28/89 SWC Fixed header and set tabs to 4.
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; <3> 12/19/89 PWD 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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;Include files
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PRINT OFF
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LOAD 'StandardEqu.d'
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INCLUDE 'AppleTalk.a' ; AppleTalk equates
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INCLUDE 'NetBootEqu.a' ; Net Boot equates
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PRINT ON
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NBSubVersion EQU 2 ; our sub version number
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;_________________________________________________
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netBOOT PROC EXPORT
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IMPORT findNOpenDriver ; our open guts
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IMPORT DoClose ; our close guts
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IMPORT DoRead ; our read guts
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IMPORT DoOpen
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STRING PASCAL
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MACHINE MC68000
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; *****************************************
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; * *
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; * Start of Boot driver *
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; * *
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; *****************************************
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;
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; Driver header
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;
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DC.W $4000+$0400+$0100 ; control,locked,read
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DC.W 0,0 ; No time, no events
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DC.W 0 ; No menu
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;
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; Entry points offset table
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;
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DC.W NBOpen-netBOOT ; open offset
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DC.W NBRead-netBOOT ; prime (read,write)
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DC.W NBControl-netBOOT ; control (eject only ?)
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DC.W NBAnRTS-netBOOT ; status
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DC.W NBClose-netBOOT ; close
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DC.W '.netBOOT' ; Driver name
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DC.B NBSubVersion ; Sub version number
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DC.B 0 ; No main version number
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;________________________________________________________________________
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;
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; Open - initialize the BOOT driver
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;
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; Called:
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; D0 = 0
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; A0 -> queue element
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; A1 -> DCE
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;
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; Usage:
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; D1 = pointer to our globals
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; A2 = queue element
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;________________________________________________________________________
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NBOpen
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MOVE.L A1,-(SP) ; save DCE
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MOVE.L dCtlStorage(A1), D1 ; get our globals
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BNE.S Xit ; punt if already opened
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MOVE.L A0,A2 ; save queue element
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IF &ForRAM THEN
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LEA netBOOT, A0 ; pick up our pointer
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_RecoverHandle ,SYS ; make it a handle
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move.l a0,-(SP)
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_DetachResource
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ENDIF
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MOVE.L #dGlobalsSize, D0 ; size of globals
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_NewPtr ,SYS,CLEAR ; get it
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BNE.S ErrXit
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MOVE.L A0,D1 ; put it where we want it
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move.l (SP), a1 ; restore a1
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MOVE.L A0,dCtlStorage(A1) ; and where we can get it later
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MOVEQ.L #0,D0
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MOVE ioRefNum(A2),D0
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MOVE.L A0, -(SP) ; push the globals
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MOVE.L D0,-(SP) ; and our refnum
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JSR DoOpen ; call the C glue
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ADDQ.L #8,SP ; clean up stack
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;
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; We have now installed an entry in the drive queue, and pointed its refNum at
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; this driver. The read routine will be the next called, for the boot blocks.
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;
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Xit MOVEQ #0,D0 ; Indicate no error
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ADDQ.L #4,SP ; pop saved DCE
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RTS ; And return
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ErrXit MOVE.L (SP)+, A1 ; pop saved DCE
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MOVE.L dCtlStorage(A1),D1
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BEQ.S @1
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MOVE.L D1,A0
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_DisposPtr ; indicate we didn't open right
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@1 MOVE.W #openErr,D0
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RTS
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RTS
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EJECT
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;________________________________________________________________________
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;
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; Close - close the BOOT driver.
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;
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; We need to clean up the boot protocol driver, if it is open, and
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; remove the drive queue entry, deallocate our globals, and return
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;
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; A1 -> DCE
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;________________________________________________________________________
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NBClose MOVE.L dCtlStorage(A1),D1 ; get our storage
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BEQ.S NBAnRTS ; punt if already closed ??
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MOVE.L A1, -(SP) ; save across call
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MOVE dCtlRefNum(A1),D0 ; D0 clear from above
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MOVE.L D0, -(SP) ; push the refnum (long in C)
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MOVE.L D1, -(SP) ; push our globals
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JSR DoClose ;
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ADDQ.L #8, SP ; clean up after C
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MOVE.L (SP)+, A1 ; restore
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CLR.L dCtlStorage(A1) ; make sure this doesn't get called again
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TST.L D0 ; check for error
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BEQ.S OkExit ; go home
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MOVE.L #closErr, D0 ; whoops, make the error known
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OkExit ;
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NBAnRTS RTS ; And return
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;________________________________________________________________________
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;
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; NBControl - close the BOOT driver.
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;
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; We need to clean up the boot protocol driver, if it is open, and
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; remove the drive queue entry, deallocate our globals, and return
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;
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; A1 -> DCE
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;________________________________________________________________________
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NBControl
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MOVE.W #offLinErr, D0 ; we don't eject
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BRA.S GoHome ; return via jIODone
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;________________________________________________________________________
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;
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; Read - get the boot image (Actually a prime call)
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;
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; This routine clears the queued param block and the driver active bit before
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; it actually completes to allow the called routines to make control calls on
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; us.
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;
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; A0 -> queue element
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; A1 -> DCE
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;________________________________________________________________________
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; equates for the boot image directory
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;
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; moved to BootEqu.a
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CASE OBJ
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NBRead
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IMPORT myGrowZone ; from BootUtils.a
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controlBit EQU 3 ; Bit for control key down
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controlByte EQU 7 ; Byte for control keys
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BTST #controlBit,KeyMap+controlByte ; Control key skips boot
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BEQ NBDontSkip ; Branch if not down
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MOVE.W #offLinErr, D0 ; try again later (sadistic)
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BRA GoHome
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NBDontSkip
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MOVE.L dCtlStorage(A1), D1 ; pick up our globals
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BEQ.S GoHome ; punt if null
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MOVEM.L A0-A1, -(SP) ; save DCE, IOPB accross call
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MOVE.L SysZone, A1 ; pick up system heap pointer
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move.l a1,TheZone ; <PWD 5>set default to system heap
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MOVE.L gzProc(A1), -(SP) ; save old grow zone
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LEA myGrowZone, A2 ; pick up my grow zone proc
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MOVE.L A2, gzProc(A1) ; tell the memory manager
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MOVE.L A0, -(SP) ; set up for doread, below
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MOVE.L D1, -(SP)
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JSR DoRead ; go do it
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ADD.L #8, SP ; clean up stack
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MOVE.L SysZone, A0 ; pick up system heap pointer
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MOVE.L (SP)+,gzProc(A0) ; restore old grow zone
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NBRestore MOVEM.L (SP)+, A0-A1 ; restore A0, A1
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GoHome MOVE.W D0,IOResult(A0) ; show that call done
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MOVE.L JIODone,A3 ; This is how we exit (Prime, Control, Status)
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JMP (A3)
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END |