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https://github.com/elliotnunn/sys7.1-doc-wip.git
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159 lines
5.1 KiB
Plaintext
159 lines
5.1 KiB
Plaintext
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; File: forXO.a
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;
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; Copyright: © 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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; <2> 3/9/90 PWD merge from xo split-off; fixes to opt-cmd pram setting and open
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; code
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; <1> 2/20/90 PWD first checked in
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;
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PRINT OFF
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LOAD 'StandardEqu.d'
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INCLUDE 'Slots.a' ; Slot equates
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INCLUDE 'ROMequ.a' ; Slot ROM declarations
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INCLUDE 'NetBootEQU.a' ; netBoot defs
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PRINT ON
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InstallNetBoot PROC EXPORT
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IMPORT netBoot
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IMPORT DoDrvrOpen
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movem.l d1-d7/a0-a7, -(sp) ; save most regs
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;
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; see if we are enabled
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;
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clr -(sp) ; make read area for _ReadXPram
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move.l sp,a0 ; place to read
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move.l #$00010007, d0 ; one byte, location 7 (forth net booting byte)
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_ReadXPRam ; trashes D0, puts byte in (a0)
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move (sp)+, d0 ; "pop" the return value
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and #BOOT_ENABLE<<8, d0 ; mask for enabled bit but in high byte
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beq @done ; punt if not enabled
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;
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; CheckForResetPRAM: Checks for the Cmd-Option-N-B keys down, resets our byte if so
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; stolen from startinit.a
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lea @Keys,a1 ; keys to check for
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lea KeyMap,a0 ; compare to the Key Down Map
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moveq.l #4-1,d0 ; compare loop count
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@loop cmpm.l (a0)+,(a1)+ ; check for exactly this combo
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dbne d0,@loop ; examine the entire key map
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bne @ok ; if not equal, keep going
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; otherwise, reset pram and go home
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clr -(sp) ; make read area for _WriteXPram
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move sp,a0 ; place to read for write
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move.l #$00010007, d0 ; one byte, location 7 (forth net booting byte)
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_ReadXPRam ; pick up existing flags byte
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andi.w #$7FFF, (sp) ; clear boot enabled flag
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move.l sp,a0 ; reset a0 for the next call
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move.l #$00010007, d0 ; one byte, location 7 (forth net booting byte)
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_WriteXPram
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tst (sp)+ ; pop stack
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bra @done ; go home
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@Keys dc.l $00080000 ; I just looked at keymap in macsbug, I have no idea
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dc.l $00208004 ; which bit is which
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dc.l $00000000
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dc.l $00000000
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;
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; We are enabled! Open the netBoot driver.
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;
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@ok lea netBoot, a3 ; point to driver to install
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move #49, d3 ; set the refnum
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bsr DoDrvrOpen
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tst d0 ; set ccr's
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@Error
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@done movem.l (sp)+,d1-d7/a0-a7 ; restore most regs
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rts
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ENDP
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DODRVROPEN PROC EXPORT
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;
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; First, find an empty unit table entry using d3 as a starting place.
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;
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lsl #2, d3 ; turn index into offset
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move.l UTableBase, a0 ; pick up unit table
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@10 tst.l 0(a0,d3.w) ; anybody home?
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beq.s @20
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addq.w #4, d3 ; bump refnum
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bra.s @10
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;
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; setup a param block for _DrvrInstall
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;
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@20 lsr #2, d3 ; turn offset into index
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sub #ioQElSize,sp ; allocate ioQElement
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move.l SP,a0 ; a0 -> ioQElement
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clr.b ioPermssn(a0) ; clear permission byte
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move d3,d0 ; d0 = driver number
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add #1, d0 ; add one and...
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neg d0 ; amke it a refnum
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move d0,ioRefnum(a0) ; Set in PB
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_DrvrInstall ; Make DCE
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bne.s @Error ; Branch if error
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move.l UTableBase,A1 ; A1 -> base of unit table
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move d3,d0 ; pick up driver number
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lsl #2, d0 ; multiply by four for long word table
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move.l 0(A1,d0.w),a2 ; a2 = handle to DCE
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move.l a2,a0 ; set up for lock
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_HLock ; Lock it down
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move.l (a2),A1 ; A1 -> DCE
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move.l a3,a2 ; a2 -> driver
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move.l a2,DCtlDriver(A1) ; Set in DCE (pretend ROM-based)
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move (a2)+,DCtlFlags(A1) ; Set flags from driver
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clr.b DCtlFlags+1(A1) ; Say it's ROM-based
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move.l (a2)+,DCtlDelay(A1) ; Set delay
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move (a2)+,DCtlMenu(A1) ; Set menu
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bset #DOpened,DCtlFlags+1(A1) ; Set flags to opened
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move DrvrOpen(a3),d1 ; d1 = offset to open routine
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move.l sp, a0 ; pick up that param block
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moveq #0,d0 ; Assume no errors
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jsr 0(a3,d1) ; Call open routine
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move ioRefNum(sp),d1 ; d1 = driver refNum to return
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@Error add #ioQElSize,sp ; deallocate the IOQEl
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tst d0
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rts
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ENDP
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;------------------------------------------------------------------------------------
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; DoATBootOpen
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;
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; This routine overrides the default open for XO, opening the driver in a pc-relative
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; manner.
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;
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; 4(sp) -> param block (ignored)
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;------------------------------------------------------------------------------------
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CASE OBJ ; c case for the linker
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DoATBootOpen PROC EXPORT
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IMPORT ATBOOT
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IMPORT DODRVROPEN
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movem.l d1-d7/a0-a7, -(sp) ; save most regs
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lea ATBoot, a3 ; pick up driver
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move #50, d3 ; driver number
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lsl #2, d3 ; turn index into offset
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move.l UTableBase, a0 ; pick up unit table
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move.l 0(a0,d3.w), d0 ; anybody home?
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beq.s @10
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move.l d0,a0 ; put in address reg
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move.l (a0), a0 ; dereference (point to dce)
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cmp.l DCtlDriver(a0), a3 ; compare to atboot driver entry
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bne.s @10 ; do real open if not
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move #-51, d1 ; fake refnum
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bra.s @ok
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@10 move #50,d3
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bsr DODRVROPEN ; do that open
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beq.s @ok
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clr d0 ; return refnum=0 if error
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bra @done
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@ok move d1,d0 ; return refnum
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@done movem.l (sp)+,d1-d7/a0-a7 ; restore most regs
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rts
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ENDP
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END
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