2012-01-09 15:07:58 +01:00
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/* $NetBSD: bootxx.S,v 1.10 2011/01/06 01:08:48 jakllsch Exp $ */
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/*-
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* Copyright (c) 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by David Laight.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#include <sys/bootblock.h>
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/*
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* Code linked to 0xa00 and copied to sectors 2+ of the netbsd boot
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* partition by MI /usr/sbin/installboot.
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* Read into memory by code in pbr.S
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*
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* On entry:
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* %dl BIOS drive number
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* %edi:%esi Sector number of NetBSD partition
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* %cs, %ds, %es, %ss All zero
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* %sp near 0xfffc
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*/
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.text
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.code16
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ENTRY(bootxx)
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jmp 1f
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.balign 4
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ENTRY(bootxx_magic)
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.long X86_BOOT_MAGIC_1 /* checked by installboot & pbr code */
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boot_params: /* space for patchable variables */
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.long 1f - boot_params /* length of this data area */
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#include <boot_params.S>
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. = bootxx + 0x80 /* Space for patching unknown params */
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1: call gdt_fixup
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calll real_to_prot
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.code32
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push %edi
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movl $_end, %ecx /* zero bss */
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movl $__bss_start, %edi
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subl %edi, %ecx
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shr $2, %ecx /* _end and __bss_start are aligned */
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xor %eax, %eax
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rep
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stosl
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pop %edi
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movzbl %dl, %edx
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push %edi /* save args for secondary bootstrap */
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push %esi
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movl %esp, %esi /* address of sector number */
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push %edx
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push %esi /* args for boot1 */
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push %edx
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call _C_LABEL(boot1) /* C code to load /boot */
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add $8, %esp
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call prot_to_real
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.code16
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test %ax, %ax
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jnz boot_fail
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pop %edx /* bios disk number */
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pop %ebx /* expected partition start sector */
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pop %ecx
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movl $boot_params, %esi
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orb $X86_BP_FLAGS_LBA64VALID, 4(%esi)
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2012-11-15 12:06:41 +01:00
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lcall $SECONDARY_LOAD_ADDRESS/16, $0
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2012-01-09 15:07:58 +01:00
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boot_fail:
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push %ax /* error string from boot1 */
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movw errno, %ax
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aam /* largest errno is < 100 */
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addw $('0' << 8) | '0', %ax /* to ascii */
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rorw $8, %ax
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cmpb $'0', %al /* supress leading zero */
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jne 10f
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movb $' ', %al
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10: movw %ax, 12f
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movw $11f, %si
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call message /* output boot failed message */
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pop %si
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call message /* and text from boot1 */
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jmp loopstop
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11: .ascii "Boot failed (errno "
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12: .asciz "xx): "
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ENTRY(_rtt)
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.code32
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call prot_to_real
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.code16
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loopstop:
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movb 0x86, %ah /* delay for about a second */
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movw $16, %cx
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int $0x15
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int $0x18 /* might be a boot fail entry */
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1: sti /* if not loopstop */
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hlt
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jmp 1b
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/*
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* Vector the fs calls through here so we can support multiple
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* file system types with one copy of the library code and
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* multiple copies of this file.
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*/
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.global xxfs_open, xxfs_close, xxfs_read, xxfs_stat
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.code32
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xxfs_open: jmp XXfs_open
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xxfs_close: jmp XXfs_close
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xxfs_read: jmp XXfs_read
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xxfs_stat: jmp XXfs_stat
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