1995-08-30 01:55:39 +04:00
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/* $NetBSD: srt0.s,v 1.3 1995/08/29 21:55:51 phil Exp $ */
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1994-10-26 11:23:50 +03:00
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1994-05-30 23:58:42 +04:00
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/*-
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* Copyright (c) 1994 Philip L. Budne.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Philip L. Budne.
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* 4. The name of Philip L. Budne may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY PHILIP NELSON ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL PHILIP NELSON BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* srt0.s -- standalone C startup
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* Phil Budne, May 10, 1994
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*
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* from: pc532 kernel locore.s
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* Phil Nelson, Dec 6, 1992
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*
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*/
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#define PSR_S 0x200
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#define PSR_I 0x800
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.data
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1995-08-30 01:55:39 +04:00
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.globl _howto, _bootdev, _r3, _r6, _r7
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1994-05-30 23:58:42 +04:00
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__save_sp: .long 0
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__save_fp: .long 0
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_bootdev: .long 0
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_howto: .long 0
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1995-08-30 01:55:39 +04:00
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_r3: .long 0
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_r6: .long 0
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_r7: .long 0
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1994-05-30 23:58:42 +04:00
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.text
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.globl begin
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begin:
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bicpsrw PSR_I /* make sure interrupts are off. */
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bicpsrw PSR_S /* make sure we are using sp0. */
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1995-08-30 01:55:39 +04:00
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/* In case we are zboot: */
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movd r3,_r3(pc) /* magic */
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movd r6,_r6(pc) /* devtype */
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movd r7,_r7(pc) /* howto */
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1994-05-30 23:58:42 +04:00
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lprd sb, 0 /* gcc expects this. */
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sprd sp, __save_sp(pc) /* save monitor's sp. */
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sprd fp, __save_fp(pc) /* save monitor's fp. */
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/* sprd intbase, __old_intbase(pc) /* save monitor's intbase. */
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movqd 0, _howto(pc)
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restart:
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/* Zero the bss segment. */
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addr _end(pc),r0 # setup to zero the bss segment.
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addr _edata(pc),r1
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subd r1,r0 # compute _end - _edata
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movd r0,tos # push length
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addr _edata(pc),tos # push address
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movqd 0,_bootdev(pc) # XXX trash bootdev
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bsr _bzero # zero the bss segment
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bsr _main
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/* fall */
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.globl __rtt
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__rtt: lprd sp, __save_sp(pc) /* restore monitor's sp. */
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lprd fp, __save_fp(pc) /* restore monitor's fp. */
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/* XXX just return to monitor??? */
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movqd 3, _howto /* RB_SINGLE|RB_ASKNAME */
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br restart
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