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mac-rom/Tidbits/LateLoad.a

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Bring in CubeE sources Resource forks are included only for .rsrc files. These are DeRezzed into their data fork. 'ckid' resources, from the Projector VCS, are not included. The Tools directory, containing mostly junk, is also excluded.
2017-09-17 09:09:04 +00:00
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;
; File: LateLoad.a
;
; Contains: LateLoad
;
; This LinkedPatch is responsible for mounting slow
; SCSI drives on TERROR machines. Because TERROR waits for the default
; Startup Drive instead of the "internal" drive, unlike older ROMs, LateLoad is
; needed to make sure that the internal drive (or drives on Eclipse or similar)
; are spun up. This is done at LP time instead of at boot time because by then,
; most drives will have spun up already and we won't have to wait at all.
;
;
; Written by: Paul Wolf
;
; Copyright: <09> 1991-1992 by Apple Computer, Inc., All rights reserved.
;
; Change History (most recent first):
;
; <SM2> 2/1/93 PN Adding LateLoad from Reality and also moved LateLoad.a into
; SCSIMgr folder
; <1> 10/24/91 SAM Rolled in Regatta file.
;
; Regatta Change History:
;
; <3> 8/29/91 SAM (pdw) Added exception for portables. They will no longer wait
; for any drives other than the "internal" drive.
; <2> 8/21/91 SAM (pdw) Changed location of drive 0 bit in PRAM from bit 0 of byte
; 3 to bit 6 of byte 8A.
; <1> 7/30/91 SAM first checked in
; <0> 6/20/91 PDW Created.
;
; To Do:
;__________________________________________________________________________________________________
BLANKS ON ; assembler accepts spaces & tabs in operand field
STRING ASIS ; generate string as specified
PRINT OFF ; do not send subsequent lines to the listing file
; don't print includes
LOAD 'StandardEqu.d' ; from StandardEqu.a and for building ROMs
INCLUDE 'HardwarePrivateEqu.a'
INCLUDE 'UniversalEqu.a' ; for VIA bit and -TestFor- definitions
INCLUDE 'FSEqu.a' ; for VCB and DrvQ stuff
INCLUDE 'SCSIEqu.a' ; for SCSIDrvrs
INCLUDE 'LinkedPatchMacros.a'
PRINT ON ; do send subsequent lines to the listing files
; CASE OBJECT ; use case as specified in source text, C
; Note <20><><EFBFBD><EFBFBD>
; This file is moved over to scsiLateLoad.a in SCSIMgr folder in SuperMario ROM
; ******************************************************************************
;---------------------------------------------------------------------
MACRO
_WaitForSCSIDevs
exg.l D0, A0
moveq #10,D0 ; WaitForSCSIDevs selector
_HWPriv
exg.l D0, A0
ENDM
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; LateLoad
;
;
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LateLoad InstallProc (IIci,hasTERROR) ; TERROR machines only!
;--- Get the stored list of drives to wait for
bsr.s GetOldDriveList ; D1.b = list of drives to wait for
;--- First, try just searching for these devices once, to see if they're there
move.w D1, D0 ; search for these devices
swap D0
move.w #0, D0 ; wait for no devices
_WaitForSCSIDevs
;--- If they are already mounted, don't do any more scans
move.b SCSIDrvrs, D0
and.b D1, D0 ; only test for those devices were interested in
cmp.b D1, D0 ; do we have them?
beq.s @gotThem ; yes - update stored drive list
;--- If they didn't get mounted by now, wait for them while scanning all SCSI IDs
move.w #$FF, D0 ; now search for all devices
swap D0
move.w D1, D0 ; and wait for the stored list of devices
_WaitForSCSIDevs
@gotThem
;--- Determine which SCSI IDs have drives that we want to remember about
bsr GetNewDriveList ; D1.w=list
;--- Update the stored drive list with the new configuration
bsr.s PutNewDriveList ; write changed drive list out to resource if needed
@end
rts
;---------------------------------------------------------------------
;
; Read the old drive list from PRAM.
;
; D1.b <-- drive list
;
;---------------------------------------------------------------------
DrvZeroBit EQU 6 ; Bit 6 in MMFlags PRAM byte 8A (for ID 0) <2>
GetOldDriveList
;--- Look at parameter RAM (1 byte at offset $89) for drives 1-6
moveq.l #0, D1
lea -2(SP),SP ; make read area for _ReadXPram
move.l sp,A0 ; place to read
move.l #$00010089, d0 ; one byte, location 89 (Bits 2-7)
_ReadXPRam ; trashes D0, puts byte in (a0)
move.b (sp)+,D1 ; "pop" the return value
lsr.b #2,D1 ; move the upper 6 bits right two places
lsl.b #1,D1 ; shift them all left 1 leaving a zero in bit 0
bsr.s GetDriveZeroBit
beq.s @exit
bset #0, D1
@exit
rts
;---------------------------------------------------------------------
;
; Put the new drive list wherever (how about a resource, no make it
; PRAM, no a resource, no ...).
;
; D1.b --> drive list
;
;---------------------------------------------------------------------
PutNewDriveList
;--- Update the "is SCSI ID 0 spinning" PRAM byte ---
bsr.s GetDriveZeroByte ; returns byte in D2 <2> thru next <2>
btst #0, D1 ; is drive 0 spun up?
beq.s @disableZero ; -> Nope, clear bit zero
@enableZero
bset #DrvZeroBit, D2 ; yes, wait for it next time too
bra.s @1
@disableZero
bclr #DrvZeroBit, D2 ; no, don't wait for it next time
@1
bsr.s PutDriveZeroByte ; accepts byte in D2 <2> from last <2>
;--- Update the bitmap of SCSI ids 1-6 in PRAM ---
lea -2(SP),SP ; make read area for _ReadXPram
move.l SP,A0 ; place to read
move.l #$00010089,D0 ; one byte, location 89 (Bits 2-7)
_ReadXPRam ; trashes D0, puts byte in (a0)
move.b (SP)+,D0 ; "pop" the return value
and.b #%11111110,D1 ; Mask out drive zero's bit (bit zero) from the drive mask
lsl.b #1,D1 ; Shift the 6 bits left 1
and.b #%00000011,D0 ; Mask out the serial bits from the PRAM byte $89
or.b D0,D1 ; Add our 6 bits to the 2 bits already there
move.b D1, -(SP) ; push new value on stack
move.l SP, A0 ; address of new PRAM value
move.l #$00010089, D0 ; write 1 bytes of PRAM to offset 3
_WriteXPRam ; save the IDs in parameter RAM
move.b (SP)+, D1
rts
;--------------------------------------------------------------------- <2> thru next <2>
GetDriveZeroBit
GetDriveZeroByte
;---------------------------------------------------------------------
;--- Look at parameter RAM (1 byte at offset 8a) for drive 0
lea -2(sp), sp ; make space for PRAM SCSI id
move.l sp, A0 ; address of PRAM return buffer
move.l #$0001008A,D0 ; read 1 byte of PRAM at offset 8a
_ReadXPRam ; get the byte
move.b (sp)+, D2 ;
btst #DrvZeroBit, D2 ; return Z flag according to drive 0 bit
rts
;---------------------------------------------------------------------
PutDriveZeroByte
;---------------------------------------------------------------------
;--- Modify parameter RAM (1 byte at offset 8a) for drive 0
move.b D2, -(SP) ; push new value on stack
move.l SP, A0 ; address of new PRAM value
move.l #$0001008A, D0 ; write 1 byte of PRAM to offset 8a
_WriteXPRam ; save the IDs in parameter RAM
move.w (SP)+, D2
rts ; <2> from last <2>
;---------------------------------------------------------------------
GetNewDriveList
;---------------------------------------------------------------------
; WITH scsiGlobalRecord
bsr.s FindFixedDrives ; Find all SCSI ID's with fixed drives in DrvQ
;--- if we are on a portable then strip all bits except for internal drive's <3> to next <3>
TestFor hwCbPwrMgr
beq.s @exit
; Look at parameter RAM (byte at offset 3) for internal drive's SCSI id
subq.l #2, sp ; make space for PRAM SCSI id
move.l sp, A0 ; address of PRAM return buffer
move.l #$00010003, D0 ; read 1 byte of PRAM at offset 3 (internal drive)
_ReadXPRam ; get the SCSI id
move.b (sp), D0 ; check high bits for validity
and.b #$78, D0 ; mask upper bits
cmp.b #$48, D0 ; equal to magic pattern?
beq.s @continue ; <2> if so, go do the real stuff
addq.w #2, sp ; <2> remove the answer from the stack
bra.s @exit ; <2> and just bail
@continue
move.b (sp)+, D0 ; check high bits for validity
and.w #$07, D0 ; mask lower 3 bits
moveq.l #0, D3
bset D0, D3 ; set only internal drive's bit in mask
and.b D3, D1 ; clear all but that drive's bit
@exit ; <3> from last <3>
rts
; ENDWITH
;---------------------------------------------------------------------
FindFixedDrives
;---------------------------------------------------------------------
move.b #0, D1 ; we start with no fixed disks
move.l DrvQHdr+qHead, A0 ; point to DrvQHdr (which points to 1st Qel)
@loop
move.b -3(A0), D0 ; is it fixed?
and.b #$0f, D0
cmp.b #$08, D0
bne.s @next
move.w dqRefNum(A0), D0
not.w D0
sub.w #$20, D0
blt.s @next ; not a SCSI driver
cmp.b #$7, D0
bgt.s @next
bset.l D0, D1 ; set the bit for this drive(r)
@next
move.l qLink(A0), A0 ; is this the end of the linked list?
move.l A0, D3 ; (test for zero link)
bne.s @loop
@exit
rts
ENDP
END.
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