nes-proj/cpu/6502/sys/lc-asm.S

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;
; Copyright (c) 2004, Adam Dunkels and Oliver Schmidt
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions
; are met:
; 1. Redistributions of source code must retain the above copyright
; notice, this list of conditions and the following disclaimer.
; 2. Redistributions in binary form must reproduce the above copyright
; notice, this list of conditions and the following disclaimer in the
; documentation and/or other materials provided with the distribution.
; 3. Neither the name of the Institute nor the names of its contributors
; may be used to endorse or promote products derived from this software
; without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
; ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
; OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
; SUCH DAMAGE.
;
; This file is part of the Contiki operating system.
;
; Author: Adam Dunkels <adam@sics.se>, Oliver Schmidt <ol.sc@web.de>
;
; $Id: lc-asm.S,v 1.2 2007/04/14 15:48:42 oliverschmidt Exp $
;
;---------------------------------------------------------------------
.importzp ptr1
.export _lc_set
.export _lc_resume
;---------------------------------------------------------------------
_lc_set:
sta ptr1
stx ptr1+1
tsx
lda $0102,x
ldy #$01
sta (ptr1),y
lda $0101,x
dey
sta (ptr1),y
rts
;---------------------------------------------------------------------
_lc_resume:
sta ptr1
stx ptr1+1
ldy #$01
lda (ptr1),y
beq :+
tsx
sta $0102,x
dey
lda (ptr1),y
sta $0101,x
: rts
;---------------------------------------------------------------------