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/* $OpenBSD: srt0.S,v 1.4 1997/04/05 18:56:19 mickey Exp $ */
/* $NetBSD: srt0.c,v 1.3 1994/10/27 04:21:59 cgd Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* @(#)srt0.c 5.3 (Berkeley) 4/28/91
*/
#include <machine/psl.h>
#define _LOCORE
#include <machine/segments.h>
#undef _LOCORE
.globl _end
.globl _edata
.globl _boot
.globl __rtt
.globl _Gdtr
.globl _Idtr_prot
.globl _codeseg
.text
.globl start_boot
start_boot:
#ifdef DEBUG
movl $0xb80a0, %ebx
movl $0x07420742, (%ebx)
#endif
/* reload new gdt */
lgdt _Gdtr
ljmp $8, $1f
1:
movw $0x10, %ax
movl %ax, %ds
movl %ax, %ss
movl %ax, %es
movl %ax, %fs
movl %ax, %gs
/* load idtr for interrupts */
lidt _Idtr_prot
#ifdef DEBUG
movl $0xb80a4, %ebx
movl $0x07520752, (%ebx)
#endif
popl %eax
cmpl $BOOTMAGIC, %eax
je 1f
#ifdef DEBUG
movl $0xb80a8, %ebx
movl $0x4741474d, (%ebx)
#endif
1:
/* zero .bss */
xorl %eax, %eax
movl $_end, %ecx
subl $_edata,%ecx
movl $_edata, %edi
cld
rep; stosb
call _boot
__rtt:
#ifdef DEBUG
movl $0xb8000, %ebx
movl $0x4f514f51, (%ebx)
hlt
#endif
movl $-7, %eax
movw $0x1234, %ax
movw %ax, 0x472 # warm boot
movl $0, %esp # segment violation
ret
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