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/* $NetBSD: start.S,v 1.14 2005/12/11 12:16:20 christos Exp $ */
/*
* Copyright (c) 1999 Christopher G. Demetriou. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* Mach Operating System
* Copyright (c) 1992 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#include "include/asm.h"
/*
* start --
* Entry point for boot/standalone programs.
*
* Unified and Primary Bootstrap arguments:
* None.
*
* Secondary Bootstrap arguments:
* a0 first free physical page
*
* Standalone program arguments:
*
* a0 first free physical page
* a1 page table base register (PTBR)
* a2 bootinfo magic number
* a3 pointer to the bootinfo structure
* a4 bootinfo version number
*
* All bootstrap and standalone programs leave exception and interrupt
* handling to the firmware, and run from the firmware-provided stack.
* To return to the firmware, these programs simply invoke the 'halt'
* PALcode operation.
*
* Bootstrap programs have to clear their own BSS. Standalone programs
* have their BSS cleared by the bootstraps.
*/
.text
.set noreorder /* don't reorder instructions */
#define ENTRY_FRAME 32
NESTED(start, 1, ENTRY_FRAME, ra, 0, 0)
br pv,Lstartgp
Lstartgp:
LDGP(pv)
#if defined(STANDALONE_PROGRAM)
/*
* save the arguments, invoke init_prom_calls() to set up console
* callbacks and output, then restore the arguments.
*/
mov a0, s0
mov a1, s1
mov a2, s2
mov a3, s3
mov a4, s4
CALL(init_prom_calls)
mov s0, a0
mov s1, a1
mov s2, a2
mov s3, a3
mov s4, a4
#else /* defined(STANDALONE_PROGRAM) */
#if !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK)
lda sp,start /* start stack below text */
lda sp,-ENTRY_FRAME(sp)
or a0,zero,s0
#endif /* !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK) */
lda a0,_edata
xor a1,a1,a1
lda a2,_end
subq a2,a0,a2
CALL(memset)
#if !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK)
or s0,zero,a0
#endif /* !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK) */
#endif /* defined(STANDALONE_PROGRAM) */
CALL(main) /* transfer to C */
XLEAF(_rtt, 0)
XLEAF(halt, 0)
call_pal PAL_halt /* halt if we ever return */
END(start)
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