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84 lines
2.4 KiB
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><link rel="stylesheet" type="text/css" href="ca65-doc-style.css"/></head><body><a href="ref_index.html"><h1>ip65 technical reference</h1></a><h1>File : ip65/copymem.s</h1><pre> utility routine to copy memory
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</pre><h2 id="functions">functions</h2><table><tr><th>function</th><th>description</th></tr><tr><td id="copymem">copymem</td><td><pre>copy memory
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inputs:
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copy_src is address of buffer to copy from
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copy_dest is address of buffer to copy to
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AX = number of bytes to copy
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outputs: none
</pre></td></tr></table><h2 id="variables">variables</h2><table><tr><th>variable</th><th>description</th><th>size (bytes)</th></tr><tr><td id="copy_dest">copy_dest</td><td> destination pointer
</td><td>2</td></tr><tr><td id="copy_src">copy_src</td><td> source pointer
</td><td>2</td></tr></table><h2>implementation</h2><pre id="code">; utility routine to copy memory
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.export copymem
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.exportzp copy_src
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.exportzp copy_dest
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.segment "IP65ZP" : zeropage
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; pointers for copying
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copy_src: .res 2 ; source pointer
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copy_dest: .res 2 ; destination pointer
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.bss
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end: .res 1
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.code
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;copy memory
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;inputs:
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; copy_src is address of buffer to copy from
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; copy_dest is address of buffer to copy to
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; AX = number of bytes to copy
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;outputs: none
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copymem:
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sta end
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ldy #0
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cpx #0
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beq @tail
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: lda (copy_src),y
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sta (copy_dest),y
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iny
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bne :-
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inc copy_src+1 ;next page
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inc copy_dest+1 ;next page
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dex
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bne :-
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@tail:
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lda end
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beq @done
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: lda (copy_src),y
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sta (copy_dest),y
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iny
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cpy end
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bne :-
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@done:
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rts
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;-- LICENSE FOR copymem.s --
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; The contents of this file are subject to the Mozilla Public License
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; Version 1.1 (the "License"); you may not use this file except in
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; compliance with the License. You may obtain a copy of the License at
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; http://www.mozilla.org/MPL/
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;
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; Software distributed under the License is distributed on an "AS IS"
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; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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; License for the specific language governing rights and limitations
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; under the License.
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;
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; The Original Code is ip65.
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;
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; The Initial Developer of the Original Code is Per Olofsson,
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; MagerValp@gmail.com.
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; Portions created by the Initial Developer are Copyright (C) 2009
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; Per Olofsson. All Rights Reserved.
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; -- LICENSE END --
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</pre></body></html>
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