Annotation of sys/arch/hppa/stand/boot/srt0.S, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: srt0.S,v 1.10 2005/04/07 00:21:51 mickey Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1998-2004 Michael Shalayeff
! 5: * All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: *
! 16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 19: * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
! 20: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
! 21: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
! 22: * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 23: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
! 24: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
! 25: * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
! 26: * THE POSSIBILITY OF SUCH DAMAGE.
! 27: */
! 28: /*
! 29: * Copyright 1996 1995 by Open Software Foundation, Inc.
! 30: * All Rights Reserved
! 31: *
! 32: * Permission to use, copy, modify, and distribute this software and
! 33: * its documentation for any purpose and without fee is hereby granted,
! 34: * provided that the above copyright notice appears in all copies and
! 35: * that both the copyright notice and this permission notice appear in
! 36: * supporting documentation.
! 37: *
! 38: * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
! 39: * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
! 40: * FOR A PARTICULAR PURPOSE.
! 41: *
! 42: * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
! 43: * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
! 44: * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
! 45: * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
! 46: * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 47: *
! 48: */
! 49: ;
! 50: ; Copyright (c) 1990 mt Xinu, Inc. All rights reserved.
! 51: ; Copyright (c) 1990 University of Utah. All rights reserved.
! 52: ;
! 53: ; This file may be freely distributed in any form as long as
! 54: ; this copyright notice is included.
! 55: ; THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
! 56: ; IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
! 57: ; WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
! 58: ;
! 59: ; Utah $Hdr: srt0.c 1.3 94/12/13$
! 60: ;
! 61:
! 62: #define _LOCORE
! 63: #include <machine/asm.h>
! 64: #include <machine/cpu.h>
! 65: #include <machine/iomod.h>
! 66:
! 67: /*
! 68: * This is the ending of the begin
! 69: */
! 70: ENTRY(begin,0)
! 71:
! 72: blr %r0,%r5 ; Get address of 'boff' into 'r5',
! 73: ldo begin-boff(%r5),%r5 ; and subtract to get 'begin'.
! 74: boff
! 75: ldil L%RELOC,%r4
! 76: ldo R%RELOC(%r4),%r4
! 77: ldo start-begin(%r4),%rp
! 78: ldil L%edata,%r3
! 79: ldo R%edata(%r3),%r3 ; Get address of edata.
! 80: ldil L%begin,%r1
! 81: ldo R%begin(%r1),%r1 ; Get address of begin
! 82: sub %r3,%r1,%r3 ; Subtract to get # of bytes to copy
! 83: copyloop ; do
! 84: ldwm 4(%r5),%r1 ; *r4++ = *r5++;
! 85: addib,>= -4,%r3,copyloop ; while (--r3 >= 0);
! 86: stwm %r1,4(%r4)
! 87:
! 88: ; here we zero the .bss
! 89: ldil L%__bss_start, %r4
! 90: ldo R%__bss_start(%r4), %r4
! 91: ldil L%__bss_end, %r3
! 92: ldo R%__bss_end(%r3), %r3
! 93: zeroloop
! 94: combf,<,n %r3,%r4, zeroloop ; while (r4 < r3);
! 95: stwm %r0,4(%r4) ; *r4++ = 0;
! 96:
! 97: ldil L%$global$,%dp
! 98: ldo R%$global$(%dp),%dp
! 99: ldil L%start,%r1
! 100: ldo R%start(%r1),%r1
! 101: sub %dp,%r1,%dp ; Subtract to get difference
! 102: add %rp,%dp,%dp ; and relocate it.
! 103:
! 104: ;
! 105: ; We have relocated ourself to RELOC. If we are running on a machine
! 106: ; with separate instruction and data caches, we must flush our data
! 107: ; cache before trying to execute the code starting at rp.
! 108: ;
! 109: ldil L%RELOC,%r22 ; Set %t1 to start of relocated code.
! 110: ldo R%RELOC(%r22),%r22
! 111: ldil L%edata,%r21 ; Set r21 to address of edata
! 112: ldo R%edata(%r21),%r21
! 113: ldil L%begin,%r1 ; set %r1 to address of begin
! 114: ldo R%begin(%r1),%r1
! 115: sub %r21,%r1,%r21 ; Subtract to get length
! 116: mtsp %r0,%sr0 ; Set sr0 to kernel space.
! 117: ldo -1(%r21),%r21
! 118: fdc %r21(0,%r22)
! 119: loop addib,>,n -16,%r21,loop ; Decrement by cache line size (16).
! 120: fdc %r21(%sr0,%r22)
! 121: fdc 0(%sr0,%r22) ; Flush first word at addr to handle
! 122: sync ; arbitrary cache line boundary.
! 123: nop ; Prevent prefetching.
! 124: nop
! 125: nop
! 126: nop
! 127: nop
! 128: nop
! 129: nop
! 130: bv 0(rp)
! 131: nop
! 132: EXIT(begin) /* jump to relocated code */
! 133:
! 134: start
! 135: ldil L%HEAP_LIMIT, %sp
! 136: ldo R%HEAP_LIMIT(%sp), %sp
! 137:
! 138: .import bootprompt, data
! 139: ldil L%bootprompt, t1
! 140: stw r26, R%bootprompt(t1)
! 141: b boot ; Call boot(),
! 142: copy %r0, arg0 ; use default boot device
! 143: nop
! 144:
! 145: /*
! 146: * rtt - restart the box
! 147: */
! 148: LEAF_ENTRY(_rtt)
! 149: ldil L%HPPA_LBCAST, %r25
! 150: ldi CMD_RESET, %r26
! 151: stw %r26,R%iomod_command(%r25)
! 152: forever ; Loop until bus reset takes effect.
! 153: b,n forever
! 154:
! 155: bv 0(rp)
! 156: ldo -48(sp),sp
! 157: EXIT(_rtt)
! 158:
! 159: .end
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