139 lines
4.6 KiB
ArmAsm
139 lines
4.6 KiB
ArmAsm
/* $NetBSD: start.S,v 1.12 1999/04/11 03:36:21 cgd Exp $ */
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/*
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* Copyright (c) 1999 Christopher G. Demetriou. 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 Christopher G. Demetriou
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Mach Operating System
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* Copyright (c) 1992 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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#include "include/asm.h"
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/*
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* start --
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* Entry point for boot/standalone programs.
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*
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* Unified and Primary Bootstrap arguments:
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* None.
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*
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* Secondary Bootstrap arguments:
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* a0 first free physical page
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*
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* Standalone program arguments:
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*
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* a0 first free physical page
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* a1 page table base register (PTBR)
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* a2 bootinfo magic number
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* a3 pointer to the bootinfo structure
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* a4 bootinfo version number
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*
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* All bootstrap and standalone programs leave exception and interrupt
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* handling to the firmware, and run from the firmware-provided stack.
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* To return to the firmware, these programs simply invoke the 'halt'
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* PALcode operation.
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*
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* Bootstrap programs have to clear their own BSS. Standalone programs
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* have their BSS cleared by the bootstraps.
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*/
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.text
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.set noreorder /* don't reorder instructions */
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#define ENTRY_FRAME 32
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NESTED(start, 1, ENTRY_FRAME, ra, 0, 0)
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br pv,Lstartgp
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Lstartgp:
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LDGP(pv)
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#if defined(STANDALONE_PROGRAM)
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/*
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* save the arguments, invoke init_prom_calls() to set up console
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* callbacks and output, then restore the arguments.
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*/
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mov a0, s0
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mov a1, s1
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mov a2, s2
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mov a3, s3
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mov a4, s4
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CALL(init_prom_calls)
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mov s0, a0
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mov s1, a1
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mov s2, a2
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mov s3, a3
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mov s4, a4
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#else /* defined(STANDALONE_PROGRAM) */
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#if !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK)
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lda sp,start /* start stack below text */
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lda sp,-ENTRY_FRAME(sp)
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or a0,zero,s0
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#endif /* !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK) */
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lda a0,_edata
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lda a1,_end
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subq a1,a0,a1
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CALL(bzero)
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#if !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK)
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or s0,zero,a0
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#endif /* !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK) */
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#endif /* defined(STANDALONE_PROGRAM) */
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CALL(main) /* transfer to C */
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XLEAF(_rtt, 0)
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XLEAF(halt, 0)
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call_pal PAL_halt /* halt if we ever return */
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END(start)
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