;--------------------------------------------------------------------------
;  crt0.s - Generic crt0.s for a Z80
;
;  Copyright (C) 2000, Michael Hope
;
;  This library is free software; you can redistribute it and/or modify it
;  under the terms of the GNU General Public License as published by the
;  Free Software Foundation; either version 2, or (at your option) any
;  later version.
;
;  This library is distributed in the hope that it will be useful,
;  but WITHOUT ANY WARRANTY; without even the implied warranty of
;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;  GNU General Public License for more details.
;
;  You should have received a copy of the GNU General Public License 
;  along with this library; see the file COPYING. If not, write to the
;  Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
;   MA 02110-1301, USA.
;
;  As a special exception, if you link this library with other files,
;  some of which are compiled with SDCC, to produce an executable,
;  this library does not by itself cause the resulting executable to
;  be covered by the GNU General Public License. This exception does
;  not however invalidate any other reasons why the executable file
;  might be covered by the GNU General Public License.
;--------------------------------------------------------------------------

	.module crt0
	.globl	_main

	.area	HEADER (ABS)

	.org	0x4200

	ld	hl,#0xfffe
	xor	a
	ld	(hl),a
	ld	a,(hl)
	or	a
	jr	nz,mem32k
	inc	(hl)
	inc	(hl)
	ld	a,(hl)
	cp	#2
	jr	nz,mem32k

	di
	ld	sp,#0x0000
	ei
	jr	init

mem32k:
	di
	ld	sp,#0x8000
	ei

init:
        call    gsinit
	call	_main
	di
	halt

	;///////////////////////////////////////////////////////////////////////
gsinit:
	ld	bc, #l__INITIALIZER
	ld	a, b
	or	a, c
	jr	Z, gsinit_next
	ld	de, #s__INITIALIZED
	ld	hl, #s__INITIALIZER
	ldir
gsinit_next:
        ret

	.area	DATA

	;; Ordering of segments for the linker.
	.area	_HOME
	.area	_CODE
	.area	_INITIALIZER
	.area   _GSINIT
	.area   _GSFINAL
        .area   _MAIN
	.area	_DATA
	.area	_INITIALIZED
	.area	_BSEG
	.area   _BSS
	.area   _HEAP

	;.area   _CODE

	.area   _GSFINAL

