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Neaten up drive queue handling

This commit is contained in:
Elliot Nunn 2021-02-23 10:06:58 +08:00
parent e31a3a81bb
commit 5086338c9f
1 changed files with 17 additions and 20 deletions
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37
ChainLoader.a
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@ -132,18 +132,10 @@ GoHereFromReadTrap
dc.w $A000 ; _Open
lea $32(SP),SP
; Create & add a drive queue entry (DQE).
move.l #$16,D0
dc.w $A71E ; _NewPtrSysClear
add.l #4,A0 ; has some cheeky flags at negative offset
move.l #$00080000,-4(A0) ; secret flags, see http://mirror.informatimago.com/next/developer.apple.com/documentation/mac/Files/Files-112.html
move.w #1,4(A0) ; qType
;move.w #0,$A(A0) ; dQFSID should be for a native fs
;move.l #0,$C(A0) ; dQDrvSz/dQDrvSz2 ; whoa, better fix this!
move.l $16(A4),D0 ; scoop drivenum & driver refnum from _Read PB
dc.w $A04E ; _AddDrive (A0=DQE, D0=drvnum/drefnum)
; Add the a drive queue entry (DQE).
lea dqLink-DrvrBase(A3),A0
move.l $16(A4),D0
dc.w $A04E ; _AddDrive (A0=DQE, D0=drvnum/drefnum)
; Open .MPP (still open?) & our DDP socket
lea -$32(SP),SP
@ -181,7 +173,6 @@ DrvrBase
DrvrName dc.b 8, ".netBOOT", 0
g
gNumBlks dc.l 0 ; the source of all truth
gMyDCE dc.l 0
gExpectHdr dc.l 0
gProgress dc.l 0
@ -193,6 +184,16 @@ gSaveAddr dcb.b 16
gAddr dcb.b 16
even
; Drive queue element
dqFlags dc.l $00080000
dqLink dc.l 0
dqType dc.w 1
dqDrive dc.w 0
dqRefNum dc.w 0
dqFSID dc.w 0
dqDrvSz dc.w 0
dqDrvSz2 dc.w 0
; a0=iopb, a1=dce on entry to all of these...
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@ -590,10 +591,8 @@ DrvrStatus
bra.s status_unknown
status_fmtLstCode ; tell them about our size
movem.l A2/A3,-(SP)
lea gNumBlks,A3
move.l (A3),D0
move.l dqDrvSz,D0
swap D0
lsl.l #5,D0 ; convert from blocks to bytes
lsl.l #4,D0
@ -602,14 +601,12 @@ status_fmtLstCode ; tell them about our size
move.l D0,0(A2)
move.l #$40000000,4(A2)
movem.l (SP)+,A2/A3
move.w #0,$10(A0) ; ioResult = noErr
bra DrvrFinish
status_drvStsCode ; tell them about some of our flags
move.w #0,$1C(A0) ; csParam[0..1] = track no (0)
move.l #$00080000,$1C+2(A0) ; csParam[2..5] = same flags as dqe
move.l dqFlags,$1C+2(A0) ; csParam[2..5] = same flags as dqe
move.w #0,$10(A0) ; ioResult = noErr
bra DrvrFinish