mirror of
https://github.com/cc65/cc65.git
synced 2024-11-06 15:06:07 +00:00
137 lines
3.1 KiB
ArmAsm
137 lines
3.1 KiB
ArmAsm
; ***
|
|
; CC65 Lynx Library
|
|
;
|
|
; Originally by Bastian Schick
|
|
; http://www.geocities.com/SiliconValley/Byte/4242/lynx/
|
|
;
|
|
; Ported to cc65 (http://www.cc65.org) by
|
|
; Shawn Jefferson, June 2004
|
|
;
|
|
; ***
|
|
;
|
|
; 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
|
|
; on the front of the fully linked binary (see EXEHDR segment.)
|
|
;
|
|
|
|
.export _exit
|
|
.export __STARTUP__ : absolute = 1 ; Mark as startup
|
|
|
|
.import initlib, donelib
|
|
.import zerobss
|
|
.import callmain
|
|
.import _main
|
|
.import __RAM_START__, __RAM_SIZE__, __STACKSIZE__
|
|
|
|
.include "zeropage.inc"
|
|
.include "extzp.inc"
|
|
.include "lynx.inc"
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Mikey and Suzy init data, reg offsets and data
|
|
|
|
.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,$29
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Actual code
|
|
|
|
.segment "STARTUP"
|
|
|
|
; Set up the system.
|
|
|
|
sei
|
|
cld
|
|
ldx #$FF
|
|
txs
|
|
|
|
; Init the bank switching.
|
|
|
|
lda #$C
|
|
sta MAPCTL ; $FFF9
|
|
|
|
; Disable all timer interrupts.
|
|
|
|
lda #$80
|
|
trb TIM0CTLA
|
|
trb TIM1CTLA
|
|
trb TIM2CTLA
|
|
trb TIM3CTLA
|
|
trb TIM5CTLA
|
|
trb TIM6CTLA
|
|
trb TIM7CTLA
|
|
|
|
; Disable the TX/RX IRQ; set to 8E1.
|
|
|
|
lda #%11101
|
|
sta SERCTL
|
|
|
|
; Clear all pending interrupts.
|
|
|
|
lda INTSET
|
|
sta INTRST
|
|
|
|
; Set up the stack.
|
|
|
|
lda #<(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
|
|
sta sp
|
|
lda #>(__RAM_START__ + __RAM_SIZE__ + __STACKSIZE__)
|
|
sta sp+1
|
|
|
|
; Init Mickey.
|
|
|
|
ldx #.sizeof(MikeyInitReg)-1
|
|
mloop: ldy MikeyInitReg,x
|
|
lda MikeyInitData,x
|
|
sta $fd00,y
|
|
dex
|
|
bpl mloop
|
|
|
|
; These are RAM-shadows of read-only regs.
|
|
|
|
ldx #$1b
|
|
stx __iodat
|
|
dex ; $1A
|
|
stx __iodir
|
|
ldx #$d
|
|
stx __viddma
|
|
|
|
; Init Suzy.
|
|
|
|
ldx #.sizeof(SuzyInitReg)-1
|
|
sloop: ldy SuzyInitReg,x
|
|
lda SuzyInitData,x
|
|
sta $fc00,y
|
|
dex
|
|
bpl sloop
|
|
|
|
lda #$24
|
|
sta __sprsys
|
|
cli
|
|
|
|
; Clear the BSS data.
|
|
|
|
jsr zerobss
|
|
|
|
; Call the module constructors.
|
|
|
|
jsr initlib
|
|
|
|
; Push the command-line arguments; and, call main().
|
|
|
|
jsr callmain
|
|
|
|
; Call the module destructors. This is also the exit() entry.
|
|
|
|
_exit: jsr donelib ; Run module destructors
|
|
|
|
; Endless loop
|
|
|
|
noret: bra noret
|