; Startup code for cc65 (ATARI version)
;
; Contributing authors:
-; Mark Keates
-; Freddy Offenga
-; Christian Groessler
-; Stefan Haubenthal
+; Mark Keates
+; Freddy Offenga
+; Christian Groessler
+; Stefan Haubenthal
;
- .export _exit
- .export __STARTUP__ : absolute = 1 ; Mark as startup
-
- .import initlib, donelib
- .import callmain, zerobss, callirq
- .import __INTERRUPTOR_COUNT__
- .import __STARTUP_LOAD__, __ZPSAVE_LOAD__
- .import __RESERVED_MEMORY__
-
- .include "zeropage.inc"
- .include "atari.inc"
-
-; ------------------------------------------------------------------------
-; EXE header
-
- .segment "EXEHDR"
- .word $FFFF
- .word __STARTUP_LOAD__
- .word __ZPSAVE_LOAD__ - 1
+ .export __STARTUP__ : absolute = 1 ; Mark as startup
+ .export _exit, start
+
+ .import initlib, donelib
+ .import callmain, zerobss
+ .import __RESERVED_MEMORY__
+ .import __MAIN_START__, __MAIN_SIZE__
+.ifdef __ATARIXL__
+ .import __STACKSIZE__
+ .import sram_init
+ .import scrdev
+ .import findfreeiocb
+ .forceimport sramprep ; force inclusion of the "shadow RAM preparation" load chunk
+ .include "save_area.inc"
+.endif
+
+ .include "zeropage.inc"
+ .include "atari.inc"
; ------------------------------------------------------------------------
-; Actual code
- .segment "STARTUP"
+.segment "STARTUP"
- rts ; fix for SpartaDOS / OS/A+
- ; they first call the entry point from AUTOSTRT and
- ; then the load addess (this rts here).
- ; We point AUTOSTRT directly after the rts.
+ rts ; fix for SpartaDOS / OS/A+
+ ; They first call the entry point from AUTOSTRT; and
+ ; then, the load address (this rts here).
+ ; We point AUTOSTRT directly after the rts.
; Real entry point:
-; Save the zero page locations we need
+start:
- ldx #zpspace-1
-L1: lda sp,x
- sta zpsave,x
- dex
- bpl L1
+.ifdef __ATARIXL__
+ jsr sram_init
+.endif
-; Clear the BSS data
+; Clear the BSS data.
- jsr zerobss
+ jsr zerobss
-; Setup the stack
+; Set up the stack.
- tsx
- stx spsave
+ tsx
+ stx SP_save
-; Report memory usage
+.ifdef __ATARIXL__
- lda APPMHI
- sta appmsav ; remember old APPMHI value
- lda APPMHI+1
- sta appmsav+1
+ lda #<(__MAIN_START__ + __MAIN_SIZE__ + __STACKSIZE__)
+ ldx #>(__MAIN_START__ + __MAIN_SIZE__ + __STACKSIZE__)
+ sta sp
+ stx sp+1
- sec
- lda MEMTOP
- sbc #<__RESERVED_MEMORY__
- sta APPMHI ; initialize our APPMHI value
- sta sp ; setup runtime stack part 1
- lda MEMTOP+1
- sbc #>__RESERVED_MEMORY__
- sta APPMHI+1
- sta sp+1 ; setup runtime stack part 2
+.else
-; If we have IRQ functions, chain our stub into the IRQ vector
+; Report the memory usage.
- lda #<__INTERRUPTOR_COUNT__
- beq NoIRQ1
- lda VVBLKI
- ldx VVBLKI+1
- sta IRQInd+1
- stx IRQInd+2
- lda #6
- ldy #<IRQStub
- ldx #>IRQStub
- jsr SETVBV
+ lda APPMHI
+ sta APPMHI_save ; remember old APPMHI value
+ lda APPMHI+1
+ sta APPMHI_save+1
-; Call module constructors
+ sec
+ lda MEMTOP
+ sbc #<__RESERVED_MEMORY__
+ sta APPMHI ; initialize our APPMHI value
+ sta sp ; set up runtime stack part 1
+ lda MEMTOP+1
+ sbc #>__RESERVED_MEMORY__
+ sta APPMHI+1
+ sta sp+1 ; set up runtime stack part 2
-NoIRQ1: jsr initlib
+.endif
-; Set left margin to 0
+; Call the module constructors.
- lda LMARGN
- sta old_lmargin
- ldy #0
- sty LMARGN
+ jsr initlib
-; Set keyb to upper/lowercase mode
+; Set the left margin to 0.
- ldx SHFLOK
- stx old_shflok
- sty SHFLOK
+ lda LMARGN
+ sta LMARGN_save
+ ldy #0
+ sty LMARGN
-; Initialize conio stuff
+; Set the keyboard to upper-/lower-case mode.
- dey ; Set X to $FF
- sty CH
+ ldx SHFLOK
+ stx SHFLOK_save
+ sty SHFLOK
-; Push arguments and call main
+; Initialize the conio stuff.
- jsr callmain
+ dey ; Set Y to $FF
+ sty CH ; remove keypress which might be in the input buffer
-; Call module destructors. This is also the _exit entry.
+; Push the command-line arguments; and, call main().
-_exit: jsr donelib ; Run module destructors
+ jsr callmain
-; Reset the IRQ vector if we chained it.
+; Call the module destructors. This is also the exit() entry.
- pha ; Save the return code on stack
- lda #<__INTERRUPTOR_COUNT__
- beq NoIRQ2
- lda #6
- ldy IRQInd+1
- ldx IRQInd+2
- jsr SETVBV
+_exit: jsr donelib ; Run module destructors
-; Restore system stuff
+; Restore the system stuff.
-NoIRQ2: ldx spsave
- txs ; Restore stack pointer
+ ldx SP_save
+ txs ; Restore stack pointer
-; Restore left margin
+; Restore the left margin.
- lda old_lmargin
- sta LMARGN
+ lda LMARGN_save
+ sta LMARGN
-; Restore kb mode
+; Restore the kb mode.
- lda old_shflok
- sta SHFLOK
+ lda SHFLOK_save
+ sta SHFLOK
-; Restore APPMHI
+; Restore APPMHI.
- lda appmsav
- sta APPMHI
- lda appmsav+1
- sta APPMHI+1
+ lda APPMHI_save
+ sta APPMHI
+ lda APPMHI_save+1
+ sta APPMHI+1
-; Copy back the zero page stuff
+.ifdef __ATARIXL__
- ldx #zpspace-1
-L2: lda zpsave,x
- sta sp,x
- dex
- bpl L2
+; Atari XL target stuff...
-; Turn on cursor
+ lda PORTB_save
+ sta PORTB
+ lda RAMTOP_save
+ sta RAMTOP
+ lda MEMTOP_save
+ sta MEMTOP
+ lda MEMTOP_save+1
+ sta MEMTOP+1
- inx
- stx CRSINH
-; Back to DOS
+; Issue a GRAPHICS 0 call (copied'n'pasted from the TGI drivers), in
+; order to restore screen memory to its default location just
+; before the ROM.
- rts
+ jsr findfreeiocb
-; ------------------------------------------------------------------------
-; The IRQ vector jumps here, if condes routines are defined with type 2.
+ ; Reopen it in Graphics 0
+ lda #OPEN
+ sta ICCOM,x
+ lda #OPNIN | OPNOT
+ sta ICAX1,x
+ lda #0
+ sta ICAX2,x
+ lda #<scrdev
+ sta ICBAL,x
+ lda #>scrdev
+ sta ICBAH,x
+ lda #3
+ sta ICBLL,x
+ lda #0
+ sta ICBLH,x
+ jsr CIOV_org
+; No error checking here, shouldn't happen(TM); and, no way to
+; recover anyway.
-IRQStub:
- cld ; Just to be sure
- jsr callirq ; Call the functions
- jmp IRQInd ; Jump to the saved IRQ vector
+ lda #CLOSE
+ sta ICCOM,x
+ jsr CIOV_org
-; ------------------------------------------------------------------------
-; Data
+.endif
-.data
+; Turn on the cursor.
-IRQInd: jmp $0000
+ ldx #0
+ stx CRSINH
-; *** end of main startup code
+; Back to DOS.
-.segment "ZPSAVE"
+ rts
-zpsave: .res zpspace
+; *** end of main startup code
- .bss
+; ------------------------------------------------------------------------
-spsave: .res 1
-appmsav: .res 1
-old_shflok: .res 1
-old_lmargin: .res 1
+.bss
- .segment "AUTOSTRT"
- .word RUNAD ; defined in atari.h
- .word RUNAD+1
- .word __STARTUP_LOAD__ + 1
+SP_save: .res 1
+SHFLOK_save: .res 1
+LMARGN_save: .res 1
+.ifndef __ATARIXL__
+APPMHI_save: .res 2
+.endif
projects / cc65 / blobdiff