/*
* Copyright 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* 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 for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/
/*
* PXE startup
* parts from sys/arch/i386/stand/lib/crt/bootsect/start_bootsect.S
*
* See PXE SPEC 4.4.5 (pdf page 88)
*/
.text
ENTRY(start)
.code16
/* Boot parameter area in same format as boot and bootxx */
jmp 1f
.balign 4
.long X86_BOOT_MAGIC_PXE
.globl _C_LABEL(boot_params)
_C_LABEL(boot_params):
.long 1f - _C_LABEL(boot_params)
#include <boot_params.S>
.space 4 * 4 /* some spare */
1:
# start is loaded at 0x0:0x7c00 but we want 0x7c0:0x0
# ljmp to the next instruction to adjust %cs
ljmp $0x7c0, $2f
2:
# set up %ds
mov %cs, %ax
mov %ax, %ds
# set up %ss and %sp
movl $_end, %eax /* top of bss */
shrl $4, %eax /* as a segment */
addw $0x2001, %ax /* and + 128k */
movw %ax, %ss /* for stack */
movw $0xfffc, %sp /* %sp at top of it */
call gdt_fixup
/* change to protected mode */
calll _C_LABEL(real_to_prot)
.code32
