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srt0.S revision 1.2 
      1 /*	$NetBSD: srt0.S,v 1.2 2004/05/18 23:29:30 gavan Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 Ben Harris
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  *
     29  * Modified by Reinoud Zandijk to get the program high water mark into the
     30  * HIMEM variable as normally seen in RISC OS. This is the max address+1 of
     31  * the current `WIMPSlot'. It used to be a #define. The HIMEM var needs to be
     32  * initialised though so it doesn't get zero'd when the BSS is later cleared.
     33  * (see srt1.c)
     34  */
     35 
     36 
     37 #include <machine/asm.h>
     38 #include <riscoscalls.h>
     39 
     40 ENTRY(_start)
     41 #ifdef BOOT_MAXIMISE_MEMORY
     42 	mvn	r0, #0
     43 	mvn	r1, #0
     44 	swi	Wimp_SlotSize
     45 	add	r0, r0, r2
     46 	mvn	r1, #0
     47 	swi	Wimp_SlotSize
     48 #endif
     49 	swi	OS_GetEnv
     50 	ldr	r6, Lhimem
     51 	str	r1, [r6]
     52 	mov	sp, r1
     53 	mov	fp, #0
     54 	b	__start
     55 
     56 Lhimem:
     57 	.word	HIMEM
     58 
     59