/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by David Laight.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Code linked to 0xa00 and copied to sectors 2+ of the netbsd boot
* partition by MI /usr/sbin/installboot.
* Read into memory by code in pbr.S
*
* On entry:
* %dl BIOS drive number
* %edi:%esi Sector number of NetBSD partition
* %cs, %ds, %es, %ss All zero
* %sp near 0xfffc
*/
.text
.code16
ENTRY(bootxx)
jmp 1f
.balign 4
ENTRY(bootxx_magic)
.long X86_BOOT_MAGIC_1 /* checked by installboot & pbr code */
boot_params: /* space for patchable variables */
.long 1f - boot_params /* length of this data area */
#include <boot_params.S>
. = bootxx + 0x80 /* Space for patching unknown params */
1: call gdt_fixup
calll real_to_prot
.code32
push %edi
movl $_end, %ecx /* zero bss */
movl $__bss_start, %edi
subl %edi, %ecx
shr $2, %ecx /* _end and __bss_start are aligned */
xor %eax, %eax
rep
stosl
pop %edi
movzbl %dl, %edx
push %edi /* save args for secondary bootstrap */
push %esi
movl %esp, %esi /* address of sector number */
push %edx
push %esi /* args for boot1 */
push %edx
call _C_LABEL(boot1) /* C code to load /boot */
add $8, %esp
movw errno, %dx
call prot_to_real
.code16
test %ax, %ax
jnz boot_fail
pop %edx /* bios disk number */
pop %ebx /* expected partition start sector */
pop %ecx
movl $boot_params, %esi
orb $X86_BP_FLAGS_LBA64VALID, 4(%esi)
lcall $SECONDARY_LOAD_ADDRESS/16, $0
boot_fail:
push %ax /* error string from boot1 */
movw %dx, %ax
aam /* largest errno is < 100 */
addw $('0' << 8) | '0', %ax /* to ascii */
rorw $8, %ax
cmpb $'0', %al /* suppress leading zero */
jne 10f
movb $' ', %al
10: movw %ax, 12f
movw $11f, %si
call message /* output boot failed message */
pop %si
call message /* and text from boot1 */
jmp loopstop
11: .ascii "Boot failed (errno "
12: .asciz "xx): "
ENTRY(_rtt)
.code32
call prot_to_real
.code16
loopstop:
movb 0x86, %ah /* delay for about a second */
movw $16, %cx
int $0x15
int $0x18 /* might be a boot fail entry */
1: sti /* if not loopstop */
hlt
jmp 1b
/*
* Vector the fs calls through here so we can support multiple
* file system types with one copy of the library code and
* multiple copies of this file.
*/
.global xxfs_open, xxfs_close, xxfs_read, xxfs_stat
.code32
xxfs_open: jmp XXfs_open
xxfs_close: jmp XXfs_close
xxfs_read: jmp XXfs_read
xxfs_stat: jmp XXfs_stat
