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/* $OpenBSD: srt0.S,v 1.7 2001/05/16 23:57:35 mickey Exp $ */
/*
* Copyright (c) 1998 Michael Shalayeff
* 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 Michael Shalayeff.
* 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.
*/
/*
* Copyright 1996 1995 by Open Software Foundation, Inc.
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both the copyright notice and this permission notice appear in
* supporting documentation.
*
* OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
;
; Copyright (c) 1990 mt Xinu, Inc. All rights reserved.
; Copyright (c) 1990 University of Utah. All rights reserved.
;
; This file may be freely distributed in any form as long as
; this copyright notice is included.
; THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
; IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
; WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
;
; Utah $Hdr: srt0.c 1.3 94/12/13$
;
#define _LOCORE
#include <machine/iomod.h>
#include <machine/asm.h>
/*
* This is the ending of the begin
*/
ENTRY(begin,0)
blr %r0,%r5 ; Get address of 'boff' into 'r5',
ldo begin-boff(%r5),%r5 ; and subtract to get 'begin'.
boff
ldil L%RELOC,%r4
ldo R%RELOC(%r4),%r4
ldo start-begin(%r4),%rp
ldil L%edata,%r3
ldo R%edata(%r3),%r3 ; Get address of edata.
ldil L%begin,%r1
ldo R%begin(%r1),%r1 ; Get address of begin
sub %r3,%r1,%r3 ; Subtract to get # of bytes to copy
copyloop ; do
ldwm 4(%r5),%r1 ; *r4++ = *r5++;
addib,>= -4,%r3,copyloop ; while (--r3 >= 0);
stwm %r1,4(%r4)
; here we zero the .bss
ldil L%__bss_start, %r4
ldo R%__bss_start(%r4), %r4
ldil L%__bss_end, %r3
ldo R%__bss_end(%r3), %r3
zeroloop
combf,<,n %r3,%r4, zeroloop ; while (r4 < r3);
stwm %r0,4(%r4) ; *r4++ = 0;
ldil L%$global$,%dp
ldo R%$global$(%dp),%dp
ldil L%start,%r1
ldo R%start(%r1),%r1
sub %dp,%r1,%dp ; Subtract to get difference
add %rp,%dp,%dp ; and relocate it.
;
; We have relocated ourself to RELOC. If we are running on a machine
; with separate instruction and data caches, we must flush our data
; cache before trying to execute the code starting at rp.
;
ldil L%RELOC,%r22 ; Set %t1 to start of relocated code.
ldo R%RELOC(%r22),%r22
ldil L%edata,%r21 ; Set r21 to address of edata
ldo R%edata(%r21),%r21
ldil L%begin,%r1 ; set %r1 to address of begin
ldo R%begin(%r1),%r1
sub %r21,%r1,%r21 ; Subtract to get length
mtsp %r0,%sr0 ; Set sr0 to kernel space.
ldo -1(%r21),%r21
fdc %r21(0,%r22)
loop addib,>,n -16,%r21,loop ; Decrement by cache line size (16).
fdc %r21(%sr0,%r22)
fdc 0(%sr0,%r22) ; Flush first word at addr to handle
sync ; arbitrary cache line boundary.
nop ; Prevent prefetching.
nop
nop
nop
nop
nop
nop
bv 0(rp)
nop
EXIT(begin) /* jump to relocated code */
start
ldil L%HEAP_LIMIT, %sp
ldo R%HEAP_LIMIT(%sp), %sp
b boot ; Call boot(),
copy %r0, arg0 ; use default boot device
nop
/*
* rtt - restart the box
*/
LEAF_ENTRY(_rtt)
ldil L%LBCAST_ADDR, %r25
ldi CMD_RESET, %r26
stw %r26,R%iomod_command(%r25)
forever ; Loop until bus reset takes effect.
b,n forever
bv 0(rp)
ldo -48(sp),sp
EXIT(_rtt)
.end
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