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Clean up sock listener's global accesses

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This commit is contained in:
Elliot Nunn 2021-02-11 13:25:04 +08:00
parent f3fbb86c64
commit 286ca935bf
1 changed files with 22 additions and 38 deletions
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60
ChainLoader.a
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@ -262,7 +262,6 @@ DrvrBase
g
gNumBlks dc.l 0 ; the source of all truth
gMyDCE dc.l 0
gTheirPB dc.l 0 ; pointer to the pending ParamBlk
gQuery
gQTypeVer dc.w 0 ; part of gQuery
gQSeqNum dc.w 0 ; part of gQuery
@ -293,18 +292,8 @@ DrvrOpen
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
DrvrPrime
cmp.b #2,$7(A0) ; ioTrap == aRdCmd
bne .notRead
move.w #1,$10(A0) ; ioResult = pending. We will return without an answer.
move.l A1,D0 ; save and restore A1
lea gTheirPB,A1 ; keep a copy of the pending PB in our code (a bit messy)
move.l A0,(A1)
move.l D0,A1
; For short requests, DevMgr puts offset in DCE
; We, oddly, stuff a BLOCK offset into ioPosOffset
; Convert the ioPosOffset in the parameter block to a block offset (allows large vol support).
btst.b #0,$2C(A0) ; test ioPosMode & kUseWidePositioning
bne.s .wide
.notwide move.l $10(A1),D0
@ -315,23 +304,19 @@ DrvrPrime
ror.l #5,D0
move.l D0,$2E(A0) ; ioPosOffset = D0 = byte_offset/512
movem.l A0-A4,-(SP) ; sleazy function that will trash stuff
; Increment the protocol sequence counter.
lea gQSeqNum,A2
addq.w #1,(A2)
; Kick the state machine.
movem.l A0-A1,-(SP)
bsr.s DrvrTransmitRequest ; takes A0 as PB argument
movem.l (SP)+,A0-A4
bge.s .noerr
dc.w $A9FF ; Elliot, this is where we get those "unimp traps"
move.w #-36,$10(A0) ; ioResult = ioErr
.noerr
movem.l (SP)+,A0-A1
; Return with a "pending" ioResult.
move.w #1,$10(A0) ; ioResult = pending. We will return without an answer.
rts
.notRead
move.w #$DDDD,D0
dc.w $A9C9
move.w #-20,$10(A0)
rts
DrvrTransmitRequest ; On entry, A0=pb. Trashes A0-A4/D0 so be careful. Uses our globals extensively.
lea g,A2
@ -344,7 +329,6 @@ DrvrTransmitRequest ; On entry, A0=pb. Trashes A0-A4/D0 so be careful. Uses our
move.b gSaveAddr-g+15(A2),gAddr-g+15(A2)
move.w #$8001,gQTypeVer-g(A2) ; Means a polite request, v1
addq.w #1,gQSeqNum-g(A2) ; Increment the sequence counter
move.l $28(A0),D0 ; [ioActCount (in bytes)
lsr.l #4,D0
@ -414,6 +398,10 @@ DrvrSockListener ; works closely with the Prime routine
; D2 Free for your use.
; D3 Free for your use.
move.l gMyDCE,A5
btst.b #7,5(A5) ; Check drvrActive flag (is there an outstanding request?)
beq .trashpacket
cmp.b #10,-1(A3) ; DDP protocol type better be ATBOOT
bne.s .trashpacket
@ -428,8 +416,9 @@ DrvrSockListener ; works closely with the Prime routine
cmp.w -6(A3),D2
bne.s .trashpacket
lea gTheirPB,A5
move.l (A5),A5
move.l gMyDCE,A5 ; Get current param block
move.l 6+2(A5),A5 ; dCtlQHdr.qHead
move.l $28(A5),D2 ; keep this in D2 because we will use it in a sec
move.l -4(A3),D3
lsl.l #4,D3
@ -444,8 +433,9 @@ DrvrSockListener ; works closely with the Prime routine
jsr 2(A4) ; ReadRest
; From this point on, use A1 instead of A5
lea gTheirPB,A1
move.l (A1),A1
move.l gMyDCE,A1 ; Get current param block
move.l 6+2(A1),A1 ; dCtlQHdr.qHead
move.l D2,$28(A1) ; update ioActCount
cmp.l $24(A1),D2 ; does it equal ioReqCount?
bne.s .rts
@ -463,20 +453,14 @@ DrvrSockListener ; works closely with the Prime routine
jsr 2(A4) ; ReadRest nothing
movem.l A0-A4,-(SP)
lea gTheirPB,A0
move.l (A0),A0
move.l gMyDCE,A0 ; Get current param block
move.l 6+2(A0),A0 ; dCtlQHdr.qHead
bsr DrvrTransmitRequest
movem.l (SP)+,A0-A4
rts
move.w #$1111,D0 ; won't happen with old-school LocalTalk
dc.w $A9C9
.trashpacket
move.w #$BBBB,D0 ; take this out when I'm confident the case doesn't matter
dc.w $A9C9
moveq.l #0,D3
jmp 2(A4) ; ReadRest nothing