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Import sys/arch/i386/stand/mbr.

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This commit is contained in:
Evgeniy Ivanov 2012-01-10 14:01:31 +04:00 committed by Ben Gras
parent fa6c4a2580
commit 6acebc04b6
14 changed files with 1668 additions and 0 deletions
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6
sys/arch/i386/stand/mbr/Makefile Normal file
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# $NetBSD: Makefile,v 1.4 2011/08/17 00:25:05 jakllsch Exp $
SUBDIR= mbr mbr_bootsel mbr_ext mbr_com0 mbr_com0_9600
SUBDIR+= gptmbr
.include <bsd.subdir.mk>

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sys/arch/i386/stand/mbr/Makefile.mbr Normal file
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# $NetBSD: Makefile.mbr,v 1.18 2011/05/20 15:05:02 joerg Exp $
S= ${.CURDIR}/../../../../..
NOMAN= # defined
LIBCRT0= # nothing
LIBCRTBEGIN= # nothing
LIBCRTEND= # nothing
LIBC= # nothing
PIE_CFLAGS=
PIE_LDFLAGS=
PIE_AFLAGS=
.include <bsd.own.mk>
STRIPFLAG= # override
SRCS?= mbr.S
BINDIR= /usr/mdec
BINMODE= 444
.PATH: ${.CURDIR}/..
LDFLAGS+= -nostdlib -Wl,-e,start
CPPFLAGS+= -I. -I${.CURDIR}/../../lib -I${S}
.if ${MACHINE_ARCH} == "x86_64"
LDFLAGS+= -Wl,-m,elf_i386
AFLAGS+= -m32
.endif
BUILDSYMLINKS+= $S/arch/i386/include machine \
$S/arch/x86/include x86
DPSRCS+= machine x86
CLEANFILES+= ${PROG}.tmp
LOADADDR= 0x8800
AFLAGS.mbr.S= ${${ACTIVE_CC} == "clang":?-no-integrated-as:}
AFLAGS.gpt.S= ${${ACTIVE_CC} == "clang":?-no-integrated-as:}
${PROG}: ${OBJS}
${_MKTARGET_LINK}
${CC} -o ${PROG}.tmp ${LDFLAGS} -Wl,-Ttext,${LOADADDR} ${OBJS}
@ set -- $$( ${NM} -t d ${PROG}.tmp | grep '\<mbr_space\>' \
| ${TOOL_SED} 's/^0*//' ); \
echo "#### There are $$1 free bytes in ${PROG}"
${OBJCOPY} -O binary ${PROG}.tmp ${PROG}
rm -f ${PROG}.tmp
.include <bsd.prog.mk>

552
sys/arch/i386/stand/mbr/gpt.S Normal file
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/* $NetBSD: gpt.S,v 1.1 2011/01/06 01:08:49 jakllsch Exp $ */
/*
* Copyright (c) 2009 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to the NetBSD Foundation
* by Mike M. Volokhov, based on the mbr.S code by Wolfgang Solfrank,
* Frank van der Linden, and David Laight.
* Development of this software was supported by the
* Google Summer of Code program.
* The GSoC project was mentored by Allen Briggs and Joerg Sonnenberger.
*
* 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.
*/
/*
* x86 PC BIOS master boot code - GUID partition table format
*/
/* Compile options:
* COM_PORT - do serial io to specified port number
* 0..3 => bios port, otherwise actual io_addr
* COM_BAUD - initialise serial port baud rate
*
* NO_LBA_CHECK - no check if bios supports LBA reads
* NO_CRC_CHECK - disable crc checks for GPT
* NO_BANNER - do not output title line 'banner'
*/
#ifdef COM_PORT
#if COM_PORT < 4
/* The first 4 items in the 40:xx segment are the serial port base addresses */
#define COM_PORT_VAL (0x400 + (COM_PORT * 2))
#else
#define COM_PORT_VAL $COM_PORT
#endif
#if !defined(COM_FREQ)
#define COM_FREQ 1843200
#endif
#endif
#include <machine/asm.h>
#include <sys/bootblock.h>
#define BOOTADDR 0x7c00
#define GPTBUFADDR 0xa000 /* GPT buffer (both header & array) */
/*
* GPT header structure, offsets
*/
#define GPTHDR_SIG_O 0 /* header signature, 8 b */
#define GPTHDR_REV_O 8 /* GPT revision, 4 b */
#define GPTHDR_SIZE_O 12 /* header size, 4 b */
#define GPTHDR_CRC_O 16 /* header CRC32, 4 b */
#define GPTHDR_RSVD_O 20 /* reserved, 4 b */
#define GPTHDR_MYLBA_O 24 /* this header LBA, 8 b */
#define GPTHDR_ALTLBA_O 32 /* alternate header LBA, 8 b */
#define GPTHDR_SLBA_O 40 /* first usable LBA, 8 b */
#define GPTHDR_ELBA_O 48 /* last usable LBA, 8 b */
#define GPTHDR_GUID_O 56 /* disk GUID, 16 b */
#define GPTHDR_PTNLBA_O 72 /* ptn. entry LBA, 8 b */
#define GPTHDR_PTNN_O 80 /* number of ptns, 4 b */
#define GPTHDR_PTNSZ_O 84 /* partition size, 4 b */
#define GPTHDR_PTNCRC_O 88 /* ptn. array CRC32, 4 b */
/*
* GPT partition entry structure, offsets
*/
#define GPTPTN_TYPE_O 0 /* ptn. type GUID, 16 b */
#define GPTPTN_GUID_O 16 /* ptn. unique GUID, 16 b */
#define GPTPTN_SLBA_O 32 /* ptn. starting LBA, 8 b */
#define GPTPTN_ELBA_O 40 /* ptn. ending LBA, 8 b */
#define GPTPTN_ATTR_O 48 /* ptn. attributes, 8 b */
#define GPTPTN_NAME_O 56 /* ptn. name, UTF-16, 72 b */
/*
* Default values of generic disk partitioning
*/
#ifndef SECTOR_SIZE
#define SECTOR_SIZE 512 /* 8192 bytes max */
#endif
#define GPTHDR_BLKNO 1
#define GPTHDR_SIZE 92 /* size of GPT header */
#define GPTHDR_LBASZ 1 /* default LBAs for header */
#define GPTHDR_PTNSZ 128 /* size of a partition entry */
#define GPTHDR_PTNN_MIN 128 /* minimum number of ptns */
#define GPTPTN_SIZE (GPTHDR_PTNSZ * GPTHDR_PTNN_MIN)
#if GPTPTN_SIZE % SECTOR_SIZE == 0
#define GPTPTN_LBASZ (GPTPTN_SIZE / SECTOR_SIZE)
#else
#define GPTPTN_LBASZ (GPTPTN_SIZE / SECTOR_SIZE + 1)
#endif
#define GPT_LBASZ (GPTHDR_LBASZ + GPTPTN_LBASZ)
/*
* Minimum and maximum drive number that is considered to be valid.
*/
#define MINDRV 0x80
#define MAXDRV 0x8f
/*
* Error codes. Done this way to save space.
*/
#define ERR_INVPART 'P' /* Invalid partition table */
#define ERR_READ 'R' /* Read error */
#define ERR_NOOS 'S' /* Magic no. check failed for part. */
#define ERR_NO_LBA 'L' /* Sector above chs limit */
#define set_err(err) movb $err, %al
.text
.code16
/*
* Move ourselves out of the way first.
* (to the address we are linked at)
* and zero our bss
*/
ENTRY(start)
xor %ax, %ax
mov %ax, %ss
movw $BOOTADDR, %sp
mov %ax, %es
mov %ax, %ds
movw $mbr, %di
mov $BOOTADDR + (mbr - start), %si
push %ax /* zero for %cs of lret */
push %di
movw $(bss_start - mbr), %cx
rep
movsb /* relocate code (zero %cx on exit) */
mov $(bss_end - bss_start + 511)/512, %ch
rep
stosw /* zero bss */
lret /* Ensures %cs == 0 */
/*
* Sanity check the drive number passed by the BIOS. Some BIOSs may not
* do this and pass garbage.
*/
mbr:
cmpb $MAXDRV, %dl /* relies on MINDRV being 0x80 */
jle 1f
movb $MINDRV, %dl /* garbage in, boot disk 0 */
1:
push %dx /* save drive number */
push %dx /* twice - for err_msg loop */
#if defined(COM_PORT) && defined(COM_BAUD)
mov $com_args, %si
mov $num_com_args, %cl /* %ch is zero from above */
mov COM_PORT_VAL, %dx
1: lodsw
add %ah, %dl
outb %dx
loop 1b
#endif
#ifndef NO_BANNER
mov $banner, %si
call message
#endif
/*
* Read and validate GUID partition tables
*
* Register use:
* %ax temp
* %bx temp
* %cx counters (%ch was preset to zero via %cx before)
* %dx disk pointer (inherited from BIOS or the check above)
* %bp GPT header pointer
*/
#ifndef NO_LBA_CHECK
/*
* Determine whether we have int13-extensions, by calling int 13, function 41.
* Check for the magic number returned, and the disk packet capability.
* On entry %dx should contain BIOS disk number.
*/
lba_check:
movw $0x55aa, %bx
movb $0x41, %ah
int $0x13
set_err(ERR_NO_LBA)
jc 1f /* no int13 extensions */
cmpw $0xaa55, %bx
jnz 1f
testb $1, %cl
jnz gpt
1: jmp err_msg
#endif
gpt:
/*
* Read GPT header
*/
movw $GPTBUFADDR, %bp /* start from primary GPT layout */
read_gpt:
call do_lba_read /* read GPT header */
jc try_gpt2
/*
* Verify GPT header
*/
movw $efihdr_sign, %si /* verify GPT signature... */
movw %bp, %di /* ptn signature is at offset 0 */
movb $sizeof_efihdr_sign, %cl /* signature length */
repe
cmpsb /* compare */
jne try_gpt2 /* if not equal - try GPT2 */
#ifndef NO_CRC_CHECK
mov %bp, %si /* verify CRC32 of the header... */
mov $GPTHDR_SIZE, %di /* header boundary */
add %bp, %di
xor %eax, %eax
xchgl %eax, GPTHDR_CRC_O(%bp) /* save and reset header CRC */
call crc32
cmp %eax, %ebx /* is CRC correct? */
jne try_gpt2
#endif
#if 0 /* XXX: weak check - safely disabled due to space constraints */
movw $lba_sector, %si /* verify GPT location... */
mov $GPTHDR_MYLBA_O, %di
add %bp, %di
movb $8, %cl /* LBA size */
repe
cmpsb /* compare */
jne try_gpt2 /* if not equal - try GPT2 */
#endif
/*
* All header checks passed - now verify GPT partitions array
*/
#ifndef NO_CRC_CHECK
movl GPTHDR_PTNCRC_O(%bp), %eax /* original array checksum */
push %bp /* save header pointer for try_gpt2 */
#endif
/*
* point %bp to GPT partitions array location
*/
cmp $GPTBUFADDR, %bp
je 1f
mov $GPTBUFADDR, %bp
jmp 2f
1: mov $GPTBUFADDR + GPTPTN_LBASZ * SECTOR_SIZE, %bp
2:
#ifndef NO_CRC_CHECK
mov %bp, %si /* array location for CRC32 check */
mov $GPTPTN_SIZE, %di /* array boundary */
add %bp, %di
call crc32
cmp %eax, %ebx /* is CRC correct? */
jne 1f /* if no - try GPT2 */
pop %ax /* restore stack consistency */
#endif
jmp gpt_parse
#ifndef NO_CRC_CHECK
1: pop %bp /* restore after unsucc. array check */
#endif
try_gpt2:
cmp $GPTBUFADDR, %bp /* is this GPT1? */
set_err(ERR_INVPART)
jne err_msg /* if no - we just tried GPT2. Stop. */
mov %bp, %si /* use [%bp] as tmp buffer */
movb $0x1a, (%si) /* init buffer size (per v.1.0) */
movb $0x48, %ah /* request extended LBA status */
int $0x13 /* ... to get GPT2 location */
set_err(ERR_NO_LBA)
jc err_msg /* on error - stop */
#define LBA_DKINFO_OFFSET 16 /* interested offset in out buffer */
addw $LBA_DKINFO_OFFSET, %si /* ... contains number of disk LBAs */
#undef LBA_DKINFO_OFFSET
movw $lba_sector, %di
movb $8, %cl /* LBA size */
rep
movsb /* do get */
subl $GPT_LBASZ, lba_sector /* calculate location of GPT2 */
sbbl $0, lba_sector + 4 /* 64-bit LBA correction */
movw $GPTBUFADDR + GPTPTN_LBASZ * SECTOR_SIZE, %bp
/* the GPT2 header location */
jmp read_gpt /* try once again */
/*
* GPT header validation done.
* Now parse GPT partitions and try to boot from appropriate.
* Register use:
* %bx partition counter
* %bp partition entry pointer (already initialized on entry)
* %di partition entry moving pointer
* %si variables pointer
* %cx counter
*/
gpt_parse:
movw $BOOTADDR, lba_rbuff /* from now we will read boot code */
movb $1, lba_count /* read PBR only */
mov $GPTHDR_PTNN_MIN, %bx /* number of GUID partitions to parse */
do_gpt_parse:
movw $bootptn_guid, %si /* lookup the boot partition GUID */
movb $0x10, %cl /* sizeof GUID */
movw %bp, %di /* set pointer to partition entry */
add %cx, %di /* partition GUID at offset 16 */
repe
cmpsb /* do compare */
jne try_nextptn /* doesn't seem appropriate ptn */
/*
* Read partition boot record
*/
mov $GPTPTN_SLBA_O, %si /* point %si to partition LBA */
add %bp, %si
movw $lba_sector, %di
movb $8, %cl /* LBA size */
rep
movsb /* set read pointer to LBA of PBR */
call do_lba_read /* read PBR */
jz try_nextptn
/*
* Check signature for valid bootcode and try to boot
*/
movb BOOTADDR, %al /* first byte non-zero */
testb %al, %al
jz 1f
movw BOOTADDR + MBR_MAGIC_OFFSET, %ax
1: cmp $MBR_MAGIC, %ax
jne try_nextptn
do_boot:
pop %dx /* ... %dx - drive # */
movw $lba_sector, %sp /* ... %ecx:%ebx - boot partition LBA */
pop %ebx
pop %ecx
movl crc32_poly, %eax /* X86_MBR_GPT_MAGIC */
jmp BOOTADDR
/* THE END */
try_nextptn:
addw $GPTHDR_PTNSZ, %bp /* move to next partition */
dec %bx /* ptncounter-- */
jnz do_gpt_parse
set_err(ERR_NOOS) /* no bootable partitions were found */
/* jmp err_msg */ /* stop */
/* Something went wrong...
* Output error code,
* reset disk subsystem - needed after read failure,
* and wait for user key
*/
err_msg:
movb %al, errcod
movw $errtxt, %si
call message
pop %dx /* drive we errored on */
xor %ax,%ax /* only need %ah = 0 */
int $0x13 /* reset disk subsystem */
int $0x18 /* BIOS might ask for a key */
/* press and retry boot seq. */
1: sti
hlt
jmp 1b
/*
* I hate #including source files, but the stuff below has to be at
* the correct absolute address.
* Clearly this could be done with a linker script.
*/
#if defined(COM_PORT) && defined(COM_BAUD)
message:
pusha
message_1:
lodsb
test %al, %al
jz 3f
mov COM_PORT_VAL, %dx
outb %al, %dx
add $5, %dl
2: inb %dx
test $0x40, %al
jz 2b
jmp message_1
3: popa
ret
#else
#include <message.S>
#endif
#if 0
#include <dump_eax.S>
#endif
#ifndef NO_CRC_CHECK
/*
* The CRC32 calculation
*
* %si address of block to hash
* %di stop address
* %ax scratch (but restored after exit)
* %dx scratch (but restored after exit)
* %cx counter
* %ebx crc (returned)
*/
crc32:
push %dx /* preserve drive number */
push %ax /* preserve original CRC */
xorl %ebx, %ebx
decl %ebx /* init value */
1:
lodsb /* load next message byte to %al */
movb $8, %cl /* set bit counter */
2:
movb %al, %dl
xorb %bl, %dl /* xoring with previous result */
shrl $1, %ebx
shrb $1, %al
testb $1, %dl
jz 3f
crc32_poly = . + 3 /* gross, but saves a few bytes */
xorl $0xedb88320, %ebx /* EFI CRC32 Polynomial */
3:
loop 2b /* loop over bits */
cmp %di, %si /* do we reached end of message? */
jne 1b
notl %ebx /* result correction */
pop %ax
pop %dx
ret
#endif
do_lba_read:
movw $lba_dap, %si
movb $0x42, %ah
int $0x13 /* read */
ret
/*
* Data definition block
*/
errtxt: .ascii "Error " /* runs into crlf if errcod set */
errcod: .byte 0
crlf: .asciz "\r\n"
#ifndef NO_BANNER
banner: .asciz "NetBSD GPT\r\n"
#endif
#if defined(COM_PORT) && defined(COM_BAUD)
#define COM_DIVISOR (((COM_FREQ / COM_BAUD) + 8) / 16)
com_args:
.byte 0x80 /* divisor latch enable */
.byte +3 /* io_port + 3 */
.byte COM_DIVISOR & 0xff
.byte -3 /* io_port */
.byte COM_DIVISOR >> 8 /* high baud */
.byte +1 /* io_port + 1 */
.byte 0x03 /* 8 bit no parity */
.byte +2 /* io_port + 3 */
num_com_args = (. - com_args)/2
#endif
/*
* Control block for int-13 LBA read - Disk Address Packet
*/
lba_dap:
.byte 0x10 /* control block length */
.byte 0 /* reserved */
lba_count:
.word GPT_LBASZ /* sector count */
lba_rbuff:
.word GPTBUFADDR /* offset in segment */
.word 0 /* segment */
lba_sector:
.quad GPTHDR_BLKNO /* sector # goes here... */
efihdr_sign:
.ascii "EFI PART" /* GPT header signature */
.long 0x00010000 /* GPT header revision */
sizeof_efihdr_sign = . - efihdr_sign
/*
* Stuff from here on is overwritten by gpt/fdisk - the offset must not change
*
* Get amount of space to makefile can report it.
* (Unfortunately I can't seem to get the value reported when it is -ve)
*/
mbr_space = bootptn_guid - .
/*
* GUID of the bootable partition. Patchable area.
* Default GUID used by installer for safety checks.
*/
. = start + MBR_GPT_GUID_OFFSET
bootptn_guid:
/* MBR_GPT_GUID_DEFAULT */
.long 0xeee69d04
.word 0x02f4
.word 0x11e0
.byte 0x8f,0x5d
.byte 0x00,0xe0,0x81,0x52,0x9a,0x6b
/* space for mbr_dsn */
. = start + MBR_DSN_OFFSET
.long 0
/* mbr_bootsel_magic */
. = start + MBR_BS_MAGIC_OFFSET
.word 0
/* mbr partition table */
. = start + MBR_PART_OFFSET
parttab:
.fill 0x40, 0x01, 0x00
. = start + MBR_MAGIC_OFFSET
.word MBR_MAGIC
/* zeroed data space */
bss_off = 0
bss_start = .
#define BSS(name, size) name = bss_start + bss_off; bss_off = bss_off + size
BSS(dump_eax_buff, 16)
BSS(bss_end, 0)

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sys/arch/i386/stand/mbr/gptmbr.S Normal file
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/* -----------------------------------------------------------------------
*
* Copyright 2007-2009 H. Peter Anvin - All Rights Reserved
* Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
#include <machine/asm.h>
#include <sys/bootblock.h>
#ifdef CTRL_80
.macro ADJUST_DRIVE
testb $0x04, BIOS_kbdflags
jz 1f
movb $0x80, %dl
1:
.endm
#elif defined(FORCE_80)
.macro ADJUST_DRIVE
movb $0x80, %dl
.endm
#else
.macro ADJUST_DRIVE
.endm
#endif
.code16
.text
.globl bootsec
stack = 0x7c00
/* Partition table header here */
phdr = stack /* Above the stack, overwritten by bootsect */
/* Partition table sector here */
/* To handle > 32K we need to play segment tricks... */
psec = _phdr + 512
/* Where we put DS:SI */
dssi_out = start + 0x1be
BIOS_kbdflags = 0x417
BIOS_page = 0x462
/* gas/ld has issues with doing this as absolute addresses... */
.section ".bootsec", "a", @nobits
.globl bootsec
bootsec:
.space 512
.text
.globl start
start:
cli
xorw %ax, %ax
movw %ax, %ds
movw %ax, %ss
movw $stack, %sp
movw %sp, %si
pushw %es /* 4(%bp) es:di -> $PnP header */
pushw %di /* 2(%bp) */
movw %ax, %es
sti
cld
/* Copy down to 0:0x600 */
movw $start, %di
movw $(512/2), %cx
rep; movsw
ljmpw $0, $next
next:
ADJUST_DRIVE
pushw %dx /* 0(%bp) = %dl -> drive number */
/* Check to see if we have EBIOS */
pushw %dx /* drive number */
movb $0x41, %ah /* %al == 0 already */
movw $0x55aa, %bx
xorw %cx, %cx
xorb %dh, %dh
stc
int $0x13
jc 1f
cmpw $0xaa55, %bx
jne 1f
shrw %cx /* Bit 0 = fixed disk subset */
jnc 1f
/* We have EBIOS; patch in the following code at
read_sector_cbios: movb $0x42, %ah ; jmp read_common */
movl $0xeb42b4+((read_common-read_sector_cbios-4) << 24), \
(read_sector_cbios)
1:
popw %dx
/* Get (C)HS geometry */
movb $0x08, %ah
int $0x13
andw $0x3f, %cx /* Sector count */
movw %sp, %bp /* %bp -> frame pointer: LEAVE UNCHANGED */
pushw %cx /* -2(%bp) Save sectors on the stack */
movzbw %dh, %ax /* dh = max head */
incw %ax /* From 0-based max to count */
mulw %cx /* Heads*sectors -> sectors per cylinder */
/* Save sectors/cylinder on the stack */
pushw %dx /* -4(%bp) High word */
pushw %ax /* -6(%bp) Low word */
/* Load partition table header */
xorl %eax,%eax
cltd
incw %ax /* %edx:%eax = 1 */
movw $phdr, %bx
pushw %bx /* -8(%bp) phdr == bootsect */
call read_sector
/* Number of partition sectors */
/* We assume the partition table is 32K or less, and that
the sector size is 512. */
/* Note: phdr == 6(%bp) */
movw (80+6)(%bp),%cx /* NumberOfPartitionEntries */
movw (84+6)(%bp),%ax /* SizeOfPartitionEntry */
pushw %ax
pushw %cx
mulw %cx
shrw $9,%ax
xchgw %ax,%cx
incw %cx
/* Starting LBA of partition array */
movl (72+6)(%bp),%eax
movl (76+6)(%bp),%edx
pushw %bx
get_ptab:
call read_sector
call inc64
loopw get_ptab
/* Find the boot partition */
xorw %si,%si /* Nothing found yet */
popw %di /* Partition table in memory */
popw %cx /* NumberOfPartitionEntries */
popw %ax /* SizeOfPartitionEntry */
find_part:
/* If the PartitionTypeGUID is all zero, it's an empty slot */
movl (%di),%edx
orl 4(%di),%edx
orl 8(%di),%edx
orl 12(%di),%edx
jz not_this
testb $0x04,48(%di)
jz not_this
andw %si,%si
jnz found_multiple
movw %di,%si
not_this:
addw %ax,%di
loopw find_part
andw %si,%si
jnz found_part
missing_os:
call error
.ascii "Missing OS\r\n"
found_multiple:
call error
.ascii "Multiple active partitions\r\n"
found_part:
xchgw %ax,%cx /* Set up %cx for rep movsb further down */
movw $dssi_out,%di
pushw %di
/* 80 00 00 00 ee 00 00 00
- bootable partition, type EFI (EE), no CHS information */
xorl %eax,%eax
movb $0x80,%al
stosl
movb $0xed,%al
stosl
movl 32(%si),%eax
movl 36(%si),%edx
call saturate_stosl /* Partition start */
movl 40(%si),%eax
movl 44(%si),%edx
subl 32(%si),%eax
sbbl 36(%si),%edx
call inc64
call saturate_stosl /* Partition length */
movzwl %cx,%eax /* Length of GPT entry */
stosl
rep; movsb /* GPT entry follows MBR entry */
popw %si
/*
* boot: invoke the actual bootstrap. %ds:%si points to the
* partition information in memory. The top word on the stack
* is phdr == 0x7c00 == the address of the boot sector.
*/
boot:
movl (32+20)(%si),%eax
movl (36+20)(%si),%edx
popw %bx
call read_sector
cmpw $0xaa55, -2(%bx)
jne missing_os /* Not a valid boot sector */
movw %bp, %sp /* driveno == bootsec-6 */
popw %dx /* dl -> drive number */
popw %di /* es:di -> $PnP vector */
popw %es
movl $0x54504721,%eax /* !GPT magic number */
cli
jmpw *%sp /* %sp == bootsec */
/*
* Store the value in %eax to %di iff %edx == 0, otherwise store -1.
* Returns the value that was actually written in %eax.
*/
saturate_stosl:
andl %edx,%edx
jz 1f
orl $-1,%eax
1: stosl
ret
/*
* Increment %edx:%eax
*/
inc64:
addl $1,%eax
adcl $0,%edx
ret
/*
* read_sector: read a single sector pointed to by %edx:%eax to
* %es:%bx. CF is set on error. All registers saved.
*/
read_sector:
pushal
pushl %edx /* MSW of LBA */
pushl %eax /* LSW of LBA */
pushw %es /* Buffer segment */
pushw %bx /* Buffer offset */
pushw $1 /* Sector count */
pushw $16 /* Size of packet */
movw %sp, %si
/* This chunk is skipped if we have ebios */
/* Do not clobber %es:%bx or %edx:%eax before this chunk! */
read_sector_cbios:
divl -6(%bp) /* secpercyl */
shlb $6, %ah
movb %ah, %cl
movb %al, %ch
xchgw %dx, %ax
divb -2(%bp) /* sectors */
movb %al, %dh
orb %ah, %cl
incw %cx /* Sectors are 1-based */
movw $0x0201, %ax
read_common:
movb (%bp), %dl /* driveno */
int $0x13
leaw 16(%si), %sp /* Drop DAPA */
popal
jc disk_error
addb $2, %bh /* bx += 512: point to the next buffer */
ret
disk_error:
call error
.ascii "Disk error on boot\r\n"
/*
* Print error messages. This is invoked with "call", with the
* error message at the return address.
*/
error:
popw %si
2:
lodsb
movb $0x0e, %ah
movb (BIOS_page), %bh
movb $0x07, %bl
int $0x10 /* May destroy %bp */
cmpb $10, %al /* Newline? */
jne 2b
int $0x18 /* Boot failure */
die:
hlt
jmp die
mbr_space = end - .
. = MBR_DSN_OFFSET
end:

10
sys/arch/i386/stand/mbr/gptmbr/Makefile Normal file
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# $NetBSD: Makefile,v 1.3 2011/09/21 18:15:59 jakllsch Exp $
PROG= gptmbr.bin
SRCS= gptmbr.S
AFLAGS.gptmbr.S= ${${ACTIVE_CC} == "clang":?-no-integrated-as:}
.include <../Makefile.mbr>
LOADADDR= 0x600

663
sys/arch/i386/stand/mbr/mbr.S Normal file
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/* $NetBSD: mbr.S,v 1.23 2010/12/08 21:56:42 jakllsch Exp $ */
/*
* Copyright (c) 1999-2004 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden, based on an earlier work by Wolfgang Solfrank.
* Major surgery performed 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.
*/
/*
* i386 master boot code
*/
/* Compile options:
* BOOTSEL - bootselector code
* BOOT_EXTENDED - scan extended partition list (LBA reads)
* COM_PORT - do serial io to specified port number
* 0..3 => bios port, otherwise actual io_addr
* COM_BAUD - initialise serial port baud rate
*
* TERSE_ERROR - terse error messages
* NO_CHS - all reads are LBA
* NO_LBA_CHECK - no check if bios supports LBA reads
* NO_BANNER - do not output title line 'banner'
*/
#ifdef BOOT_EXTENDED
#define NO_CHS 1
#define BOOTSEL 1
#endif
#ifdef COM_PORT
#if COM_PORT < 4
/* The first 4 items in the 40:xx segment are the serial port base addresses */
#define COM_PORT_VAL (0x400 + (COM_PORT * 2))
#else
#define COM_PORT_VAL $COM_PORT
#endif
#if !defined(COM_FREQ)
#define COM_FREQ 1843200
#endif
#else
#undef COM_BAUD
#endif
#ifdef BOOTSEL
#define TERSE_ERROR 1
#endif
#include <machine/asm.h>
#include <sys/bootblock.h>
#define BOOTADDR 0x7c00 /* where we get loaded to */
#define TABENTRYSIZE (MBR_BS_PARTNAMESIZE + 1)
#define NAMETABSIZE (MBR_PART_COUNT * TABENTRYSIZE)
#ifdef COM_PORT
/* ASCII values for the keys */
#define KEY_ACTIVE '\r'
#define KEY_DISK1 'a'
#define KEY_PTN1 '1'
#else
/* Scan values for the various keys we use, as returned by the BIOS */
#define SCAN_ENTER 0x1c
#define SCAN_F1 0x3b
#define SCAN_1 0x2
#define KEY_ACTIVE SCAN_ENTER
#define KEY_DISK1 SCAN_F1
#define KEY_PTN1 SCAN_1
#endif
/*
* Minimum and maximum drive number that is considered to be valid.
*/
#define MINDRV 0x80
#define MAXDRV 0x8f
#ifdef TERSE_ERROR
/*
* Error codes. Done this way to save space.
*/
#define ERR_INVPART '1' /* Invalid partition table */
#define ERR_READ '2' /* Read error */
#define ERR_NOOS '3' /* Magic no. check failed for part. */
#define ERR_KEY '?' /* unknown key press */
#define ERR_NO_LBA 'L' /* sector above chs limit */
#define set_err(err) movb $err, %al
#else
#define set_err(err) mov $err, %ax
#endif
.text
.code16
/*
* Move ourselves out of the way first.
* (to the address we are linked at)
* and zero our bss
*/
ENTRY(start)
xor %ax, %ax
mov %ax, %ss
movw $BOOTADDR, %sp
mov %ax, %es
mov %ax, %ds
movw $mbr, %di
mov $BOOTADDR + (mbr - start), %si
push %ax /* zero for %cs of lret */
push %di
movw $(bss_start - mbr), %cx
rep
movsb /* relocate code */
mov $(bss_end - bss_start + 511)/512, %ch
rep
stosw /* zero bss */
lret /* Ensures %cs == 0 */
/*
* Sanity check the drive number passed by the BIOS. Some BIOSs may not
* do this and pass garbage.
*/
mbr:
cmpb $MAXDRV, %dl /* relies on MINDRV being 0x80 */
jle 1f
movb $MINDRV, %dl /* garbage in, boot disk 0 */
1:
push %dx /* save drive number */
push %dx /* twice - for err_msg loop */
#if defined(COM_BAUD)
mov $com_args, %si
mov $num_com_args, %cl /* %ch is zero from above */
mov COM_PORT_VAL, %dx
1: lodsw
add %ah, %dl
outb %dx
loop 1b
#endif
#ifndef NO_BANNER
mov $banner, %si
call message_crlf
#endif
/*
* Walk through the selector (name) table printing used entries.
*
* Register use:
* %ax temp
* %bx nametab[] boot seletor menu
* %ecx base of 'extended' partition
* %edx next extended partition
* %si message ptr (etc)
* %edi sector number of this partition
* %bp parttab[] mbr partition table
*/
bootsel_menu:
movw $nametab, %bx
#ifdef BOOT_EXTENDED
xorl %ecx, %ecx /* base of extended partition */
next_extended:
xorl %edx, %edx /* for next extended partition */
#endif
lea parttab - nametab(%bx), %bp
next_ptn:
movb 4(%bp), %al /* partition type */
#ifdef NO_CHS
movl 8(%bp), %edi /* partition sector number */
#ifdef BOOT_EXTENDED
cmpb $MBR_PTYPE_EXT, %al /* Extended partition */
je 1f
cmpb $MBR_PTYPE_EXT_LBA, %al /* Extended LBA partition */
je 1f
cmpb $MBR_PTYPE_EXT_LNX, %al /* Linux extended partition */
jne 2f
1: movl %edi, %edx /* save next extended ptn */
jmp 4f
2:
#endif
addl lba_sector, %edi /* add in extended ptn base */
#endif
test %al, %al /* undefined partition */
je 4f
cmpb $0x80, (%bp) /* check for active partition */
jne 3f /* jump if not... */
#define ACTIVE (4 * ((KEY_ACTIVE - KEY_DISK1) & 0xff))
#ifdef NO_CHS
movl %edi, ptn_list + ACTIVE /* save location of active ptn */
#else
mov %bp, ptn_list + ACTIVE
#endif
#undef ACTIVE
3:
#ifdef BOOTSEL
cmpb $0, (%bx) /* check for prompt */
jz 4f
/* output menu item */
movw $prefix, %si
incb (%si)
call message /* menu number */
mov (%si), %si /* ':' << 8 | '1' + count */
shl $2, %si /* const + count * 4 */
#define CONST (4 * ((':' << 8) + '1' - ((KEY_PTN1 - KEY_DISK1) & 0xff)))
#ifdef NO_CHS
movl %edi, ptn_list - CONST(%si) /* sector to read */
#else
mov %bp, ptn_list - CONST(%si) /* partition info */
#endif
#undef CONST
mov %bx, %si
call message_crlf /* prompt */
#endif
4:
add $0x10, %bp
add $TABENTRYSIZE, %bx
cmpb $(nametab - start - 0x100) + 4 * TABENTRYSIZE, %bl
jne next_ptn
#ifdef BOOT_EXTENDED
/*
* Now check extended partition chain
*/
testl %edx, %edx
je wait_key
testl %ecx, %ecx
jne 1f
xchg %ecx, %edx /* save base of ext ptn chain */
1: addl %ecx, %edx /* sector to read */
movl %edx, lba_sector
movw $lba_info, %si
movb $0x42, %ah
pop %dx /* recover drive # */
push %dx /* save drive */
int $0x13
movw $BOOTADDR + (nametab - start), %bx
jnc next_extended /* abort menu on read fail */
#endif
/*
* The non-bootsel code traverses this code path, it needs the
* correct keycode to select the active partition.
*/
#ifndef BOOTSEL
mov $(KEY_ACTIVE - KEY_DISK1) & 0xff, %ax
#else
/*
* Get the initial time value for the timeout comparison. It is returned
* by int 1a in cx:dx. We do sums modulo 2^16 so it doesn't matter if
* the counter wraps (which it does every hour) - so we can safely
* ignore 'cx'.
*
* Loop around checking for a keypress until we have one, or timeout is
* reached.
*/
wait_key:
xorb %ah, %ah
int $0x1a
mov %dx, %di /* start time to di */
3:
#ifdef COM_PORT_VAL
mov COM_PORT_VAL, %dx
push %dx
add $5, %dx
inb %dx
pop %dx
test $1, %al
jz 1f
inb %dx
jmp check_key
#else
movb $1, %ah /* looks to see if a */
int $0x16 /* key has been pressed */
jz 1f
get_key:
xorb %ah, %ah
int $0x16 /* 'read key', code ah, ascii al */
shr $8, %ax /* code in %al, %ah zero */
jmp check_key
#endif
1: xorb %ah, %ah
int $0x1a /* current time to cx:dx */
sub %di, %dx
cmpw timeout, %dx /* always wait for 1 tick... */
jbe 3b /* 0xffff means never timeout */
def_key:
mov defkey, %al /* timedout - we need %ah to still be zero! */
/*
* We have a keycode, see what it means.
* If we don't know we generate error '?' and go ask again
*/
check_key:
/*
* F1-F10 -> boot disk 0-9. Check if the requested disk isn't above
* the number of disks actually in the system as stored in 0:0475 by
* the BIOS.
* If we trust loc 475, we needn't check the upper bound on the keystroke
* This is always sector 0, so always read using chs.
*/
subb $KEY_DISK1, %al
cmpb 0x0475, %al
jae boot_ptn
addb $0x80, %al
pop %dx /* dump saved drive # */
push %ax /* replace with new */
#ifdef NO_CHS
xorl %ebp, %ebp /* read sector number 0 */
jmp boot_lba
#else
movw $chs_zero, %si /* chs read sector zero info */
jmp read_chs
#endif
#endif /* BOOTSEL */
/*
* Boot requested partition.
* Use keycode to index the table we generated when we scanned the mbr
* while generating the menu.
*
* We very carfully saved the values in the correct part of the table.
*/
boot_ptn:
shl $2, %ax
movw %ax, %si
#ifdef NO_CHS
movl ptn_list(%si), %ebp
testl %ebp, %ebp
jnz boot_lba
#else
mov ptn_list(%si), %si
test %si, %si
jnz boot_si
#endif
#ifdef BOOTSEL
set_err(ERR_KEY)
#else
set_err(ERR_INVPART)
#endif
/* jmp err_msg */
/* Something went wrong...
* Output error code,
* reset disk subsystem - needed after read failure,
* and wait for user key
*/
err_msg:
#ifdef TERSE_ERROR
movb %al, errcod
movw $errtxt, %si
call message
#else
push %ax
movw $errtxt, %si
call message
pop %si
call message_crlf
#endif
pop %dx /* drive we errored on */
xor %ax,%ax /* only need %ah = 0 */
int $0x13 /* reset disk subsystem */
#ifdef BOOTSEL
pop %dx /* original drive number */
push %dx
push %dx
#ifdef COM_PORT_VAL
jmp wait_key /* Read with timeout (again) */
#else
jmp get_key /* Blocking read */
#endif
#else
int $0x18 /* BIOS might ask for a key */
/* press and retry boot seq. */
1: sti
hlt
jmp 1b
#endif
#ifndef NO_CHS
/*
* Active partition pointed to by si.
* Read the first sector.
*
* We can either do a CHS (Cylinder Head Sector) or an LBA (Logical
* Block Address) read. Always doing the LBA one
* would be nice - unfortunately not all systems support it.
* Also some may contain a separate (eg SCSI) bios that doesn't
* support it even when the main bios does.
*
* There is also the additional problem that the CHS values may be wrong
* (eg if fdisk was run on a different system that used different BIOS
* geometry). We convert the CHS value to a LBA sector number using
* the geometry from the BIOS, if the number matches we do a CHS read.
*/
boot_si:
movl 8(%si), %ebp /* get sector # */
testb $MBR_BS_READ_LBA, flags
jnz boot_lba /* fdisk forced LBA read */
pop %dx /* collect saved drive... */
push %dx /* ...number to dl */
movb $8, %ah
int $0x13 /* chs info */
/*
* Validate geometry, if the CHS sector number doesn't match the LBA one
* we'll do an LBA read.
* calc: (cylinder * number_of_heads + head) * number_of_sectors + sector
* and compare against LBA sector number.
* Take a slight 'flier' and assume we can just check 16bits (very likely
* to be true because the number of sectors per track is 63).
*/
movw 2(%si), %ax /* cylinder + sector */
push %ax /* save for sector */
shr $6, %al
xchgb %al, %ah /* 10 bit cylinder number */
shr $8, %dx /* last head */
inc %dx /* number of heads */
mul %dx
mov 1(%si), %dl /* head we want */
add %dx, %ax
and $0x3f, %cx /* number of sectors */
mul %cx
pop %dx /* recover sector we want */
and $0x3f, %dx
add %dx, %ax
dec %ax
cmp %bp, %ax
je read_chs
#ifndef NO_LBA_CHECK
/*
* Determine whether we have int13-extensions, by calling int 13, function 41.
* Check for the magic number returned, and the disk packet capability.
*/
movw $0x55aa, %bx
movb $0x41, %ah
pop %dx
push %dx
int $0x13
set_err(ERR_NO_LBA)
jc err_msg /* no int13 extensions */
cmpw $0xaa55, %bx
jnz err_msg
testb $1, %cl
jz err_msg
#endif /* NO_LBA_CHECK */
#endif /* NO_CHS */
/*
* Save sector number (passed in %ebp) into lba parameter block,
* read the sector and leap into it.
*/
boot_lba:
movl %ebp, lba_sector /* save sector number */
movw $lba_info, %si
movb $0x42, %ah
pop %dx /* recover drive # */
do_read:
push %dx /* save drive */
int $0x13
set_err(ERR_READ)
jc err_msg
/*
* Check signature for valid bootcode
*/
movb BOOTADDR, %al /* first byte non-zero */
test %al, %al
jz 1f
movw BOOTADDR + MBR_MAGIC_OFFSET, %ax
1: cmp $MBR_MAGIC, %ax
set_err(ERR_NOOS)
jnz err_msg
/* We pass the sector number through to the next stage boot.
* It doesn't have to use it (indeed no other mbr code will generate) it,
* but it does let us have a NetBSD pbr that can identify where it was
* read from! This lets us use this code to select between two
* NetBSD system on the same physical driver.
* (If we've read the mbr of a different disk, it gets a random number
* - but it wasn't expecting anything...)
*/
movl %ebp, %esi
pop %dx /* recover drive # */
jmp BOOTADDR
#ifndef NO_CHS
/*
* Sector below CHS limit
* Do a cylinder-head-sector read instead.
*/
read_chs:
pop %dx /* recover drive # */
movb 1(%si), %dh /* head */
movw 2(%si), %cx /* ch=cyl, cl=sect */
movw $BOOTADDR, %bx /* es:bx is buffer */
movw $0x201, %ax /* command 2, 1 sector */
jmp do_read
#endif
/*
* Control block for int-13 LBA read.
* We need a xx, 00, 01, 00 somewhere to load chs for sector zero,
* by a complete fluke there is one here!
*/
chs_zero:
lba_info:
.word 0x10 /* control block length */
.word 1 /* sector count */
.word BOOTADDR /* offset in segment */
.word 0 /* segment */
lba_sector:
.long 0x0000 /* sector # goes here... */
.long 0x0000
errtxt: .ascii "Error " /* runs into crlf if errcod set */
errcod: .byte 0
crlf: .asciz "\r\n"
#ifndef NO_BANNER
#ifdef BOOTSEL
#ifdef COM_PORT_VAL
banner: .asciz "a: disk"
#else
banner: .asciz "Fn: diskn"
#endif
#else
banner: .asciz "NetBSD MBR boot"
#endif
#endif
#ifdef BOOTSEL
prefix: .asciz "0: "
#endif
#ifndef TERSE_ERROR
ERR_INVPART: .asciz "No active partition"
ERR_READ: .asciz "Disk read error"
ERR_NOOS: .asciz "No operating system"
#ifndef NO_LBA_CHECK
ERR_NO_LBA: .asciz "Invalid CHS read"
#endif
#ifdef BOOTSEL
ERR_KEY: .asciz "bad key"
#endif
#endif
#if defined(COM_BAUD)
#define COM_DIVISOR (((COM_FREQ / COM_BAUD) + 8) / 16)
com_args:
.byte 0x80 /* divisor latch enable */
.byte +3 /* io_port + 3 */
.byte COM_DIVISOR & 0xff
.byte -3 /* io_port */
.byte COM_DIVISOR >> 8 /* high baud */
.byte +1 /* io_port + 1 */
.byte 0x03 /* 8 bit no parity */
.byte +2 /* io_port + 3 */
num_com_args = (. - com_args)/2
#endif
/*
* I hate #including source files, but the stuff below has to be at
* the correct absolute address.
* Clearly this could be done with a linker script.
*/
message_crlf:
call message
movw $crlf, %si
#include <message.S>
#if 0
#include <dump_eax.S>
#endif
/*
* Stuff from here on is overwritten by fdisk - the offset must not change...
*
* Get amount of space to makefile can report it.
* (Unfortunately I can't seem to get the value reported when it is -ve)
*/
mbr_space = defkey - .
. = start + MBR_BS_OFFSET
/*
* Default action, as a keyvalue we'd normally read from the BIOS.
*/
defkey:
.byte KEY_ACTIVE /* ps/2 code */
#ifndef BOOTSEL_FLAGS
#define BOOTSEL_FLAGS 0
#endif
flags: .byte MBR_BS_NEWMBR | BOOTSEL_FLAGS
/*
* Timeout value. ~65536 ticks per hour, which is ~18.2 times per second.
* 0xffff means never timeout.
*/
timeout:
.word 182 /* default to 10 seconds */
/*
* mbr_bootsel
*/
nametab:
.fill MBR_PART_COUNT * (MBR_BS_PARTNAMESIZE + 1), 0x01, 0x00
/* space for mbr_dsn */
. = start + MBR_DSN_OFFSET
.long 0
/* mbr_bootsel_magic */
. = start + MBR_BS_MAGIC_OFFSET
.word MBR_BS_MAGIC
/*
* MBR partition table
*/
. = start + MBR_PART_OFFSET
parttab:
.fill 0x40, 0x01, 0x00
. = start + MBR_MAGIC_OFFSET
.word MBR_MAGIC
/* zeroed data space */
bss_off = 0
bss_start = .
#define BSS(name, size) name = bss_start + bss_off; bss_off = bss_off + size
BSS(ptn_list, 256 * 4) /* long[]: boot sector numbers */
BSS(dump_eax_buff, 16)
BSS(bss_end, 0)

5
sys/arch/i386/stand/mbr/mbr/Makefile Normal file
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# $NetBSD: Makefile,v 1.3 2009/11/18 21:04:12 dsl Exp $
PROG= mbr
.include <../Makefile.mbr>

8
sys/arch/i386/stand/mbr/mbr_bootsel/Makefile Normal file
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# $NetBSD: Makefile,v 1.3 2005/12/11 12:17:49 christos Exp $
PROG= mbr_bootsel
AFLAGS+= -DBOOTSEL
AFLAGS+= -DTERSE_ERROR
AFLAGS+= -DBOOTSEL_FLAGS=MBR_BS_ACTIVE
.include <../Makefile.mbr>

8
sys/arch/i386/stand/mbr/mbr_com0/Makefile Normal file
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# $NetBSD: Makefile,v 1.1 2008/01/19 21:01:35 dsl Exp $
PROG= mbr_com0
AFLAGS+= -DBOOTSEL -DBOOT_EXTENDED -DCOM_PORT=0
AFLAGS+= -DTERSE_ERROR -DNO_CHS
AFLAGS+= "-DBOOTSEL_FLAGS=MBR_BS_ACTIVE|MBR_BS_EXTLBA|MBR_BS_ASCII"
.include <../Makefile.mbr>

8
sys/arch/i386/stand/mbr/mbr_com0_9600/Makefile Normal file
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# $NetBSD: Makefile,v 1.1 2008/01/19 21:01:35 dsl Exp $
PROG= mbr_com0_9600
AFLAGS+= -DBOOTSEL -DBOOT_EXTENDED -DCOM_PORT=0 -DCOM_BAUD=9600
AFLAGS+= -DTERSE_ERROR -DNO_CHS
AFLAGS+= "-DBOOTSEL_FLAGS=MBR_BS_ACTIVE|MBR_BS_EXTLBA|MBR_BS_ASCII"
.include <../Makefile.mbr>

8
sys/arch/i386/stand/mbr/mbr_ext/Makefile Normal file
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@ -0,0 +1,8 @@
# $NetBSD: Makefile,v 1.3 2005/12/11 12:17:49 christos Exp $
PROG= mbr_ext
AFLAGS+= -DBOOTSEL -DBOOT_EXTENDED
AFLAGS+= -DTERSE_ERROR -DNO_CHS
AFLAGS+= "-DBOOTSEL_FLAGS=MBR_BS_ACTIVE|MBR_BS_EXTLBA"
.include <../Makefile.mbr>

6
sys/arch/i386/stand/mbr/mbr_gpt/Makefile Normal file
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@ -0,0 +1,6 @@
# $NetBSD: Makefile,v 1.1 2011/01/06 01:08:49 jakllsch Exp $
PROG= mbr_gpt
SRCS= gpt.S
.include <../Makefile.mbr>

7
sys/arch/i386/stand/mbr/mbr_gpt_com0/Makefile Normal file
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@ -0,0 +1,7 @@
# $NetBSD: Makefile,v 1.1 2011/01/06 01:08:49 jakllsch Exp $
PROG= mbr_gpt_com0
SRCS= gpt.S
AFLAGS+= -DCOM_PORT=0
.include <../Makefile.mbr>

1
tools/nbsd_ports
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@ -45,6 +45,7 @@ dist/bzip2 src/dist/bzip2
share/zoneinfo src/share/zoneinfo
sys/arch/i386/stand/bootxx src/sys/arch/i386/stand/bootxx
sys/arch/i386/stand/boot src/sys/arch/i386/stand/boot
sys/arch/i386/stand/mbr src/sys/arch/i386/stand/mbr
sys/arch/i386/stand/lib src/sys/arch/i386/stand/lib
sys/lib/libsa src/sys/lib/libsa
sys/lib/libz src/sys/lib/libz