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17 Bit Software 1: Collection A
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NTSC-PAL
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BootPAL.asm
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Assembly Source File
|
1988-07-25
|
8KB
|
314 lines
OPT c+,l-,o+
*********************
* *
* BootPAL 1.1 *
* *
* by Nico François *
*********************
incdir "INCLUDE:"
include "exec/types.i"
include "exec/execbase.i"
include "exec/memory.i"
include "exec/resident.i"
include "exec/exec_lib.i"
include "graphics/gfxbase.i"
include "graphics/graphics_lib.i"
include "libraries/dos_lib.i"
NULL equ 0
movem.l d0/a0,-(a7)
move.l ($4).w,a6
lea DosName(PC),a1
jsr _LVOOldOpenLibrary(a6) ; open DOS
lea DOSBase(PC),a1
move.l d0,(a1)
move.l d0,a6
jsr _LVOOutput(a6) ; get stdout
lea stdout(PC),a1
move.l d0,(a1)
lea header.txt(PC),a0 ; print header to console
move.l #header.len,d3
bsr puts
move.w $DFF004,d0 ; check for new 1Mb Agnus
and.w #$2000,d0
bne.s ok1MbAgnus
addq.w #8,a7
lea oldagnus.txt(PC),a0 ; if not available print
move.l #oldagnus.len,d3 ; message
move.l ($4).w,a6
bra putsandexit
ok1MbAgnus:
movem.l (a7)+,d0/a0 ; get command line back
move.l ($4).w,a6
move.b #0,0(a0,d0.w) ; zero terminated
cmdloop:
move.b (a0)+,d0 ; look for 'I' or 'R'
beq.s template
cmp.b #'i',d0
beq.s install
cmp.b #'I',d0
beq.s install
cmp.b #'r',d0
beq quit
cmp.b #'R',d0
beq quit
bra.s cmdloop
template: ; print usage line
lea usage.txt(PC),a0
move.l #usage.len,d3
bra putsandexit
install:
move.l ($4).w,a6
lea PortName(PC),a1
jsr _LVOFindPort(a6) ; find our port
tst.l d0
beq.s allocit
lea already.txt(PC),a0 ; found, so already installed
move.l #already.len,d3
bra putsandexit
allocit:
move.l #BlockLen,d0
move.l #MEMF_CHIP,d1 ; allocate memory for reset code
jsr _LVOAllocMem(a6) ; must be in CHIP !!
tst.l d0
bne.s memok
lea nomem.txt(PC),a0 ; out of memory ???
move.l #nomem.len,d3
bra putsandexit
memok:
move.l d0,a5 ; a5 holds address of copy
lea StartBlock(PC),a0
move.l d0,a1
move.l #BlockLen,d0
jsr _LVOCopyMem(a6) ; copy block to allocated memory
move.w #$4000,$DFF09A ; DISABLE
addq.b #1,IDNestCnt(a6)
lea RomTagPtrs-StartBlock(a5),a0
move.l KickTagPtr(a6),4(a0) ; old romtag pointer in array
beq.s yestag
bset #7,4(a0) ; set bit if there are more
yestag:
move.l a0,KickTagPtr(a6) ; pointer to our array
lea RomTag-StartBlock(a5),a1
move.l a1,(a0) ; fill in our romtag pointer
lea myMemList-StartBlock(a5),a1 ; init memlist and put in
move.l a5,ML_SIZE+ME_ADDR(a1) ; KickMemPtr list to protect
move.l KickMemPtr(a6),d0 ; our memory
move.l d0,LN_SUCC(a1)
move.l a1,KickMemPtr(a6)
inittag:
lea RomTag-StartBlock(a5),a1 ; init romtag
move.l a1,RT_MATCHTAG(a1)
lea RT_SIZE(a1),a2
move.l a2,RT_ENDSKIP(a1)
lea TagName-StartBlock(a5),a2
move.l a2,RT_NAME(a1)
move.l a5,RT_INIT(a1)
jsr _LVOSumKickData(a6) ; calculate checksum
move.l d0,KickCheckSum(a6)
lea Port-StartBlock(a5),a1 ; init and add our port
moveq #0,d0
move.l d0,(a1)
move.l d0,LN_PRED(a1)
lea PortName-StartBlock(a5),a0
move.l a0,LN_NAME(a1)
jsr _LVOAddPort(a6)
subq.b #1,IDNestCnt(a6) ; ENABLE
bge.s noenable
move.w #$C000,$DFF09A
noenable:
lea installed.txt(PC),a0 ; inform user of installation
move.l #installed.len,d3
bra.s putsandexit
quit:
lea PortName(PC),a1 ; are we already installed ?
jsr _LVOFindPort(a6)
tst.l d0
bne.s portfound
lea nohandler.txt(PC),a0 ; no, can't quit then
move.l #nohandler.len,d3
bra.s putsandexit
portfound:
move.l d0,a4 ; we found our port, so remove it
move.l a4,a1
jsr _LVORemPort(a6)
move.w #$4000,$DFF09A ; DISABLE
addq.b #1,IDNestCnt(a6)
lea myMemList-Port(a4),a1 ; remove our memlist from
lea KickMemPtr(a6),a0 ; KickMemPtr list.
nextnode:
move.l LN_SUCC(a0),d0
cmp.l d0,a1
beq.s foundmylist
move.l d0,a0
bra.s nextnode
foundmylist:
move.l LN_SUCC(a1),d0
move.l d0,LN_SUCC(a0) ; LN_SUCC = 0, so this also works for KickMemPtr
move.l RomTagPtrs-Port+4(a4),KickTagPtr(a6) ; old RomTag back
beq.s noclr2
bclr #7,KickCheckSum(a6)
noclr2:
jsr _LVOSumKickData(a6) ; calculate checksum
move.l d0,KickCheckSum(a6)
subq.b #1,IDNestCnt(a6) ; ENABLE
bge.s noenable2
move.w #$C000,$DFF09A
noenable2:
lea StartBlock-Port(a4),a1 ; free our copied block
move.l #BlockLen,d0
jsr _LVOFreeMem(a6)
lea removed.txt(PC),a0 ; and inform the user
move.l #removed.len,d3
putsandexit:
bsr.s puts ; print string in A0, length D3
move.l DOSBase(PC),a1
jsr _LVOCloseLibrary(a6) ; close DOS and exit
moveq #0,d0
rts
* text-ptr in A0, length in D3
puts:
move.l a6,-(a7)
move.l a0,d2
move.l stdout(PC),d1
move.l DOSBase(PC),a6
jsr _LVOWrite(a6)
move.l (a7)+,a6
rts
header.txt:
dc.b $9b,'1mBootPAL 1.1 ',$9b,'0m',$9b,'33mby Nico François',$9b,'0m',10
header.len equ *-header.txt
oldagnus.txt:
dc.b 'You haven''t got the ECS 1Mb Agnus, so run out and buy one !',10,0
oldagnus.len equ *-oldagnus.txt
already.txt:
dc.b 'PAL RomTag already installed !',10,0
already.len equ *-already.txt
usage.txt:
dc.b 'Usage: BootPAL [I=INSTALL|R=REMOVE]',10,0
usage.len equ *-usage.txt
installed.txt:
dc.b 'PAL RomTag installed, reset to activate !',10,0
installed.len equ *-installed.txt
nomem.txt:
dc.b 'No memory for RomTag (I only need about 250 bytes) !?!',10,0
nomem.len equ *-nomem.txt
nohandler.txt:
dc.b 'PAL RomTag not installed !',10,0
nohandler.len equ *-nohandler.txt
removed.txt:
dc.b 'PAL RomTag removed !',10,0
removed.len equ *-removed.txt
DosName:
dc.b 'dos.library',0
EVEN
DOSBase:
dc.l 0
stdout:
dc.l 0
*****************************************************************************
StartBlock: ; this is the routine that will
movem.l d0-d7/a0-a6,-(a7) ; be executed when we reset
move.l ($4).w,a6
lea Port(PC),a1 ; add our port to the system list
moveq #0,d0
move.l d0,(a1)
move.l d0,LN_PRED(a1)
lea PortName(PC),a0
move.l a0,LN_NAME(a1)
jsr _LVOAddPort(a6)
**** Put AMIGA in PAL mode ****
lea GfxName(PC),a1
jsr _LVOOldOpenLibrary(a6) ; open graphics.library
move.l d0,a1
move.w #311,gb_MaxDisplayRow(a1) ; Normally not allowed, but needed !
move.w gb_DisplayFlags(a1),d0
and.b #%11111110,d0 ; clear NTSC flag
or.b #%00000100,d0 ; set PAL flag
move.w d0,gb_DisplayFlags(a1)
move.w #256,gb_NormalDisplayRows(a1) ; WorkBench 256 pixels high
or.b #LIBF_CHANGED,LIB_FLAGS(a1)
move.l a1,a2
jsr _LVOSumLibrary(a6) ; recalculate checksum
move.l a2,a1
jsr _LVOCloseLibrary(a6)
move.b #50,VBlankFrequency(a6) ; change VBLANK
or.b #LIBF_CHANGED,LIB_FLAGS(a6)
jsr _LVOSumLibrary(a6) ; recalculate checksum
************************
move.w #32,$dff1dc ; this one does all the magic
************************
endtag:
movem.l (sp)+,d0-d7/a0-a6 ; back to kickstart
rts
RomTagPtrs:
dc.l 0,0 ; array of RomTag pointers
GfxName:
dc.b 'graphics.library',0
PortName:
dc.b 'BootPAL.port',0 ; port name
TagName:
dc.b 'PAL-boot',0 ; tag name
EVEN
myMemList: ; memory list for reset protection
ds.b LN_SIZE
dc.w 1
dc.l NULL
dc.l BlockLen
Port: ; our port structure
dc.l NULL
dc.l NULL
dc.b NT_MSGPORT
dc.b 0
dc.l NULL
dc.b 0
dc.b 0
dc.l NULL
ds.b 14
RomTag: ; the RomTag to inform kickstart
dc.w RTC_MATCHWORD ; of what we want
dc.l NULL
dc.l NULL
dc.b RTF_COLDSTART
dc.b 1
dc.b 0
dc.b -10
dc.l NULL
dc.l NULL
dc.l 0
BlockLen equ *-StartBlock ; length of block to be copied
*****************************************************************************
END