;
; ***
;
-; Startup code for cc65 (Lynx version). Based on Atari 8-bit startup
+; Startup code for cc65 (Lynx version). Based on the Atari 8-bit startup
; code structure. The C stack is located at the end of the RAM memory
-; segment and grows downward. Bastian Schick's executable header is put
+; segment, and grows downward. Bastian Schick's executable header is put
; on the front of the fully linked binary (see EXEHDR segment.)
;
- .include "lynx.inc"
- .export _exit
+ .export _exit
.export __STARTUP__ : absolute = 1 ; Mark as startup
- .import callirq, initlib, donelib
- .import zerobss
- .import callmain
- .import _main
- .import __BSS_LOAD__
- .import __INTERRUPTOR_COUNT__
- .import __RAM_START__, __RAM_SIZE__, __STACKSIZE__
- .import __BSS_SIZE__
+ .import initlib, donelib
+ .import zerobss
+ .import callmain
+ .import _main
+ .import __RAM_START__, __RAM_SIZE__, __STACKSIZE__
- .include "zeropage.inc"
+ .include "zeropage.inc"
.include "extzp.inc"
-
-
-; ------------------------------------------------------------------------
-; EXE header
-__BLOCKSIZE__=1024
- .segment "EXEHDR"
- .byte 'L','Y','N','X' ; magic
- .word __BLOCKSIZE__ ; bank 0 page size
- .word __BLOCKSIZE__ ; bank 1 page size
- .word 1 ; version number
- .asciiz "Cart name " ; 32 bytes cart name
- .asciiz "Manufacturer " ; 16 bytes manufacturer
- .byte 0 ; rotation 1=left
- ; rotation 2=right
- .byte 0,0,0,0,0 ; spare
-
-__LOADER_SIZE__=410
-
- ; The cart starts with an encrypted loader for 1024 bytes/block
- ; images. The size of the loader is 410 bytes followed by two
- ; mandatory directory entries.
- .byte $FD,$C1,$0D,$8E,$E9,$EE,$09,$13,$E5,$96
- .byte $0C,$34,$64,$DA,$D4,$BB,$99,$EC,$CE,$4F
- .byte $AA,$8C,$ED,$65,$F0,$32,$70,$A3,$84,$C4
- .byte $FC,$A2,$6D,$3A,$F8,$77,$4B,$AC,$9B,$54
- .byte $7D,$82,$6F,$F8,$A5,$06,$4D,$7B,$77,$55
- .byte $E4,$31,$C4,$2C,$2F,$2F,$B6,$4D,$15,$A9
- .byte $C7,$99,$5D,$6E,$B3,$97,$92,$44,$7B,$2B
- .byte $85,$18,$E6,$F1,$96,$F4,$C4,$DE,$A4,$CF
- .byte $79,$E2,$C1,$1A,$E0,$0C,$93,$C5,$26,$BD
- .byte $A3,$16,$8A,$C3,$59,$A0,$39,$38,$A0,$3B
- .byte $EF,$BB,$1D,$5C,$0D,$1D,$CC,$48,$1D,$DD
- .byte $98,$9A,$7A,$F7,$96,$F9,$61,$03,$50,$DA
- .byte $47,$69,$94,$C3,$80,$DA,$A9,$99,$A1,$21
- .byte $2B,$2E,$7D,$F5,$E4,$F7,$B3,$5C,$A8,$14
- .byte $FA,$E9,$06,$AC,$1E,$9F,$B5,$31,$BE,$42
- .byte $14,$08,$0E,$05,$FB,$25,$BB,$5C,$5C,$66
- .byte $76,$8E,$36,$E8,$EB,$39,$F2,$26,$BD,$17
- .byte $29,$F4,$B8,$1D,$7E,$EE,$47,$61,$BB,$9E
- .byte $F5,$72,$C9,$BC,$26,$37,$D5,$78,$8F,$D0
- .byte $CE,$95,$21,$EB,$4A,$07,$8D,$3A,$3A,$01
- .byte $82,$CF,$01,$C5,$1E,$1D,$A8,$41,$4F,$BD
- .byte $C1,$76,$22,$A3,$88,$D9,$57,$C9,$51,$3A
- .byte $26,$BE,$4A,$1A,$7F,$42,$61,$CF,$FC,$FC
- .byte $5B,$06,$94,$D2,$2C,$78,$45,$BA,$93,$C4
- .byte $7D,$7C,$81,$73,$07,$4F,$E2,$6C,$E9,$81
- .byte $1A,$DE,$77,$74,$87,$DE,$26,$9E,$7A,$A8
- .byte $19,$A7,$34,$32,$70,$ED,$59,$A8,$4A,$D8
- .byte $FE,$CB,$DD,$02,$2F,$CE,$92,$E9,$13,$A6
- .byte $FF,$B4,$4B,$18,$9D,$63,$48,$E0,$3B,$3B
- .byte $0D,$2B,$FC,$04,$A4,$E3,$5E,$4C,$3C,$94
- .byte $70,$C4,$F0,$64,$15,$48,$68,$17,$DE,$14
- .byte $72,$F0,$59,$33,$4C,$49,$47,$8D,$B6,$F4
- .byte $82,$4E,$B7,$4E,$01,$C9,$C2,$82,$0B,$7A
- .byte $AC,$67,$9B,$0F,$04,$E1,$B6,$78,$34,$C8
- .byte $4F,$2A,$11,$ED,$D0,$1C,$6D,$CD,$3D,$47
- .byte $09,$8B,$E5,$38,$19,$7A,$31,$6E,$30,$71
- .byte $1C,$90,$34,$E5,$44,$CC,$00,$C7,$41,$D0
- .byte $27,$8A,$06,$29,$5C,$2B,$E4,$26,$63,$09
- .byte $52,$D3,$97,$33,$D7,$59,$1C,$36,$2F,$C9
- .byte $A9,$A2,$B5,$BB,$A9,$1D,$E6,$36,$7E,$56
- .byte $05,$A4,$9C,$E0,$45,$59,$21,$E1,$E6,$21
-
- ; The directory structure required by the 410 byte bootloader
-__DIRECTORY_START__:
-; Entry 0 - title sprite (mandatory)
-off0=__LOADER_SIZE__+(__DIRECTORY_END__-__DIRECTORY_START__)
-blocka=off0/__BLOCKSIZE__
-len0=(__TITLE_END__-__TITLE_START__)
- .byte <blocka
- .word off0 & (__BLOCKSIZE__ - 1)
- .byte $00
- .word __TITLE_START__
- .word len0
-
-; Entry 1 - first executable (mandatory)
-off1=off0+len0
-block1=off1/__BLOCKSIZE__
-len1=__RAM_SIZE__-__BSS_SIZE__
- .byte <block1
- .word off1 & (__BLOCKSIZE__ - 1)
- .byte $88
- .word __RAM_START__
- .word len1
-__DIRECTORY_END__:
- .org $b000
-__TITLE_START__:
- ; The palette for the title sprite. Complete black.
- .byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
- .byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
- ; The title sprite
-cls_sprite:
- .byte %00000001 ; A pixel sprite
- .byte %00010000
- .byte %00100000
- .addr 0,pixel_bitmap
- .word 0
- .word 0
- .word $a000 ; 160
- .word $6600 ; 102
- .byte $00
-pixel_bitmap:
- .byte 3,%10000100,%00000000, $0 ; A pixel bitmap
-__TITLE_END__:
- .reloc
+ .include "lynx.inc"
; ------------------------------------------------------------------------
; Mikey and Suzy init data, reg offsets and data
- .rodata
+ .rodata
SuzyInitReg: .byte $28,$2a,$04,$06,$92,$83,$90
SuzyInitData: .byte $7f,$7f,$00,$00,$24,$f3,$01
MikeyInitReg: .byte $00,$01,$08,$09,$20,$28,$30,$38,$44,$50,$8a,$8b,$8c,$92,$93
MikeyInitData: .byte $9e,$18,$68,$1f,$00,$00,$00,$00,$00,$ff,$1a,$1b,$04,$0d,$29
-
; ------------------------------------------------------------------------
; Actual code
- .segment "STARTUP"
+ .segment "STARTUP"
-; set up system
+; Set up the system.
- sei
- cld
- ldx #$FF
- txs
+ sei
+ cld
+ ldx #$FF
+ txs
-; init bank switching
+; Init the bank switching.
- lda #$C
- sta MAPCTL ; $FFF9
+ lda #$C
+ sta MAPCTL ; $FFF9
-; disable all timer interrupts
+; Disable all timer interrupts.
- lda #$80
- trb TIM0CTLA
- trb TIM1CTLA
- trb TIM2CTLA
- trb TIM3CTLA
- trb TIM5CTLA
- trb TIM6CTLA
- trb TIM7CTLA
+ lda #$80
+ trb TIM0CTLA
+ trb TIM1CTLA
+ trb TIM2CTLA
+ trb TIM3CTLA
+ trb TIM5CTLA
+ trb TIM6CTLA
+ trb TIM7CTLA
-; disable TX/RX IRQ, set to 8E1
+; Disable the TX/RX IRQ; set to 8E1.
- lda #%11101
- sta SERCTL
+ lda #%11101
+ sta SERCTL
-; clear all pending interrupts
+; Clear all pending interrupts.
- lda INTSET
- sta INTRST
+ lda INTSET
+ sta INTRST
-; setup the stack
+; Set up the stack.
- lda #<(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
- sta sp
- lda #>(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
- sta sp+1
+ lda #<(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
+ sta sp
+ lda #>(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
+ sta sp+1
-; Init Mickey
+; Init Mickey.
- ldx #.sizeof(MikeyInitReg)-1
+ ldx #.sizeof(MikeyInitReg)-1
mloop: ldy MikeyInitReg,x
- lda MikeyInitData,x
- sta $fd00,y
- dex
- bpl mloop
+ lda MikeyInitData,x
+ sta $fd00,y
+ dex
+ bpl mloop
-; these are RAM-shadows of read only regs
+; These are RAM-shadows of read-only regs.
- ldx #$1b
- stx __iodat
- dex ; $1A
- stx __iodir
- ldx #$d
- stx __viddma
+ ldx #$1b
+ stx __iodat
+ dex ; $1A
+ stx __iodir
+ ldx #$d
+ stx __viddma
-; Init Suzy
+; Init Suzy.
- ldx #.sizeof(SuzyInitReg)-1
+ ldx #.sizeof(SuzyInitReg)-1
sloop: ldy SuzyInitReg,x
- lda SuzyInitData,x
- sta $fc00,y
- dex
- bpl sloop
-
- lda #$24
- sta __sprsys
+ lda SuzyInitData,x
+ sta $fc00,y
+ dex
+ bpl sloop
-; Clear the BSS data
+ lda #$24
+ sta __sprsys
+ cli
- jsr zerobss
+; Clear the BSS data.
-; If we have IRQ functions, set the IRQ vector
-; as Lynx is a console there is not much point in releasing the IRQ
+ jsr zerobss
- lda #<__INTERRUPTOR_COUNT__
- beq NoIRQ1
- lda #<IRQStub
- ldx #>IRQStub
- sei
- sta INTVECTL
- stx INTVECTH
- cli
+; Call the module constructors.
-; Call module constructors
+ jsr initlib
-NoIRQ1: jsr initlib
-
-; Push arguments and call main
+; Push the command-line arguments; and, call main().
jsr callmain
-; Call module destructors. This is also the _exit entry.
+; Call the module destructors. This is also the exit() entry.
_exit: jsr donelib ; Run module destructors
; Endless loop
noret: bra noret
-
-
- .segment "CODE"
-IRQStub:
- phy
- phx
- pha
- cld
- jsr callirq
- lda INTSET
- sta INTRST
- pla
- plx
- ply
- rti
-
projects / cc65 / blobdiff