2000-05-28 13:40:48 +00:00
|
|
|
;
|
|
|
|
|
; Startup code for cc65 (C128 version)
|
|
|
|
|
;
|
|
|
|
|
; This must be the *first* file on the linker command line
|
|
|
|
|
;
|
|
|
|
|
|
|
|
|
|
.export _exit
|
|
|
|
|
.import __hinit, initconio, doneconio, zerobss
|
|
|
|
|
.import push0, doatexit, _main
|
|
|
|
|
|
|
|
|
|
.include "c128.inc"
|
|
|
|
|
.include "../cbm/cbm.inc"
|
|
|
|
|
|
|
|
|
|
; ------------------------------------------------------------------------
|
|
|
|
|
; Define and export the ZP variables for the C64 runtime
|
|
|
|
|
|
|
|
|
|
.exportzp sp, sreg, regsave
|
|
|
|
|
.exportzp ptr1, ptr2, ptr3, ptr4
|
|
|
|
|
.exportzp tmp1, tmp2, tmp3, tmp4
|
|
|
|
|
.exportzp regbank, zpspace
|
|
|
|
|
|
2000-09-07 21:49:13 +00:00
|
|
|
.zeropage
|
|
|
|
|
|
|
|
|
|
zpstart = *
|
|
|
|
|
sp: .res 2 ; Stack pointer
|
|
|
|
|
sreg: .res 2 ; Secondary register/high 16 bit for longs
|
|
|
|
|
regsave: .res 2 ; slot to save/restore (E)AX into
|
|
|
|
|
ptr1: .res 2
|
|
|
|
|
ptr2: .res 2
|
|
|
|
|
ptr3: .res 2
|
|
|
|
|
ptr4: .res 2
|
|
|
|
|
tmp1: .res 1
|
|
|
|
|
tmp2: .res 1
|
|
|
|
|
tmp3: .res 1
|
|
|
|
|
tmp4: .res 1
|
|
|
|
|
regbank: .res 6 ; 6 byte register bank
|
|
|
|
|
|
|
|
|
|
zpspace = * - zpstart ; Zero page space allocated
|
|
|
|
|
|
|
|
|
|
.code
|
2000-05-28 13:40:48 +00:00
|
|
|
|
|
|
|
|
; ------------------------------------------------------------------------
|
|
|
|
|
; BASIC header with a SYS call
|
|
|
|
|
|
|
|
|
|
.org $1BFF
|
|
|
|
|
.word Head ; Load address
|
|
|
|
|
Head: .word @Next
|
|
|
|
|
.word 1000 ; Line number
|
|
|
|
|
.byte $9E,"7181" ; SYS 7181
|
|
|
|
|
.byte $00 ; End of BASIC line
|
|
|
|
|
@Next: .word 0 ; BASIC end marker
|
|
|
|
|
.reloc
|
|
|
|
|
|
|
|
|
|
; ------------------------------------------------------------------------
|
|
|
|
|
; Actual code
|
|
|
|
|
|
|
|
|
|
ldy #zpspace-1
|
|
|
|
|
L1: lda sp,y
|
|
|
|
|
sta zpsave,y ; save the zero page locations we need
|
|
|
|
|
dey
|
|
|
|
|
bpl L1
|
|
|
|
|
|
|
|
|
|
; Close open files
|
|
|
|
|
|
|
|
|
|
jsr CLRCH
|
|
|
|
|
|
|
|
|
|
; Switch to second charset
|
|
|
|
|
|
|
|
|
|
lda #14
|
|
|
|
|
jsr BSOUT
|
|
|
|
|
|
|
|
|
|
; Get the current MMU setting and save it. Set new memory config.
|
|
|
|
|
|
|
|
|
|
lda MMU_CR ; Get current memory configuration...
|
|
|
|
|
pha ; ...and save it for later
|
|
|
|
|
lda #$0E ; Bank0 with kernal ROM
|
|
|
|
|
sta MMU_CR
|
|
|
|
|
|
|
|
|
|
; Clear the BSS data
|
|
|
|
|
|
|
|
|
|
jsr zerobss
|
|
|
|
|
|
|
|
|
|
; Save system stuff and setup the stack
|
|
|
|
|
|
|
|
|
|
pla ; Get MMU setting
|
|
|
|
|
sta mmusave
|
|
|
|
|
|
|
|
|
|
tsx
|
|
|
|
|
stx spsave ; save system stk ptr
|
|
|
|
|
|
|
|
|
|
lda #<$C000
|
|
|
|
|
sta sp
|
|
|
|
|
lda #>$C000
|
|
|
|
|
sta sp+1
|
|
|
|
|
|
|
|
|
|
; Initialize the heap
|
|
|
|
|
|
|
|
|
|
jsr __hinit
|
|
|
|
|
|
|
|
|
|
; Initialize conio stuff
|
|
|
|
|
|
|
|
|
|
jsr initconio
|
|
|
|
|
|
|
|
|
|
; Pass an empty command line
|
|
|
|
|
|
|
|
|
|
jsr push0 ; argc
|
|
|
|
|
jsr push0 ; argv
|
|
|
|
|
|
|
|
|
|
ldy #4 ; Argument size
|
|
|
|
|
jsr _main ; call the users code
|
|
|
|
|
|
|
|
|
|
; fall thru to exit...
|
|
|
|
|
|
|
|
|
|
_exit: jsr doatexit ; call exit functions
|
|
|
|
|
|
|
|
|
|
; Reset the conio stuff
|
|
|
|
|
|
|
|
|
|
jsr doneconio
|
|
|
|
|
|
|
|
|
|
; Reset stack and the MMU
|
|
|
|
|
|
|
|
|
|
ldx spsave ; Patched at runtime
|
|
|
|
|
txs
|
|
|
|
|
lda mmusave ; Patched at runtime
|
|
|
|
|
sta MMU_CR
|
|
|
|
|
|
|
|
|
|
; Copy back the zero page stuff
|
|
|
|
|
|
|
|
|
|
ldy #zpspace-1
|
|
|
|
|
L2: lda zpsave,y
|
|
|
|
|
sta sp,y
|
|
|
|
|
dey
|
|
|
|
|
bpl L2
|
|
|
|
|
|
|
|
|
|
; Done
|
|
|
|
|
|
|
|
|
|
jmp RESTOR
|
|
|
|
|
|
|
|
|
|
.data
|
|
|
|
|
zpsave: .res zpspace
|
|
|
|
|
|
|
|
|
|
.bss
|
|
|
|
|
spsave: .res 1
|
|
|
|
|
mmusave:.res 1
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
