/* $OpenBSD: srt0.S,v 1.8 2003/05/19 08:19:45 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 #include /* * 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 .import bootprompt, data ldil L%bootprompt, t1 stw r26, R%bootprompt(t1) 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