mirror of
https://github.com/cc65/cc65.git
synced 2024-12-26 08:32:00 +00:00
ffc06fcea3
However the stack (usually 1 kB) can be securely placed in the secondary area without effort from the side of the developer. The rest of the secondary area (usually 4 kB) is made available to the developer as (uninitialized) 'EXTBSS'. git-svn-id: svn://svn.cc65.org/cc65/trunk@5696 b7a2c559-68d2-44c3-8de9-860c34a00d81
68 lines
1.5 KiB
ArmAsm
68 lines
1.5 KiB
ArmAsm
;
|
|
; Startup code for geos
|
|
;
|
|
; Maciej 'YTM/Elysium' Witkowiak
|
|
; 26.10.99, 10.3.2000, 15.8.2001, 23.12.2002
|
|
|
|
.export _exit
|
|
.export __STARTUP__ : absolute = 1 ; Mark as startup
|
|
.import __STACKADDR__, __STACKSIZE__ ; Linker generated
|
|
.import __BACKBUFSIZE__ ; Linker generated
|
|
.import initlib, donelib
|
|
.import callmain
|
|
.import zerobss
|
|
.importzp sp
|
|
|
|
.include "jumptab.inc"
|
|
.include "geossym.inc"
|
|
.include "const.inc"
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Place the startup code in a special segment.
|
|
|
|
.segment "STARTUP"
|
|
|
|
; GEOS 64/128 initializes the screen before starting an application while
|
|
; Apple GEOS does not. In order to provide identical startup conditions
|
|
; we initialize the screen here on Apple GEOS. For the same reason we set
|
|
; the pattern and dispBufferOn even on GEOS 64/128 although we don't use
|
|
; them here.
|
|
|
|
lda #2 ; Checkerboard pattern
|
|
jsr SetPattern
|
|
lda #<(ST_WR_FORE | .MIN (ST_WR_BACK, __BACKBUFSIZE__))
|
|
sta dispBufferOn
|
|
.ifdef __GEOS_APPLE__
|
|
jsr i_Rectangle
|
|
.byte 0
|
|
.byte SC_PIX_HEIGHT-1
|
|
.word 0
|
|
.word SC_PIX_WIDTH-1
|
|
.endif
|
|
|
|
; Clear the BSS data.
|
|
|
|
jsr zerobss
|
|
|
|
; Setup stack.
|
|
|
|
lda #<(__STACKADDR__ + __STACKSIZE__)
|
|
ldx #>(__STACKADDR__ + __STACKSIZE__)
|
|
sta sp
|
|
stx sp+1
|
|
|
|
; Call module constructors.
|
|
|
|
jsr initlib
|
|
|
|
; Push arguments and call main().
|
|
|
|
cli
|
|
jsr callmain
|
|
|
|
; Call module destructors.
|
|
|
|
_exit: jsr donelib
|
|
|
|
jmp EnterDeskTop ; Return control to the system
|