1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
531 lines
11 KiB
ArmAsm
531 lines
11 KiB
ArmAsm
/*
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* Mach Operating System
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* Copyright (c) 1992, 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*
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* from: Mach, Revision 2.2 92/04/04 11:36:29 rpd
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* $FreeBSD$
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*/
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/*
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Copyright 1988, 1989, 1990, 1991, 1992
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by Intel Corporation, Santa Clara, California.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appears in all
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copies and that both the copyright notice and this permission notice
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appear in supporting documentation, and that the name of Intel
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not be used in advertising or publicity pertaining to distribution
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of the software without specific, written prior permission.
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INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Ported to PC-9801 by Yoshio Kimura
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*/
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#include "asm.h"
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.file "start.S"
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SIGNATURE= 0xaa55
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LOADSZ= 8192 /* size of unix boot */
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NAMEBLOCKMAGIC= 0xfadefeed /* value of magicnumebr for block2 */
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/*
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* This DEBUGMSG(msg) macro may be useful for debugging. Its use is
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* restricted to this file since it only works in real mode.
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*/
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#define DEBUGMSG(msg) \
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data32 ; \
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mov $msg, %esi ; \
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data32 ; \
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call message
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.text
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.globl start
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ENTRY(boot1)
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jmp start
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boot_cyl:
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.word 0
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String "IPL1 "
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start:
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/* set up %ds */
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xor %ax, %ax
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mov %ax, %ds
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/* set up %ss and %esp */
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data32
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mov $BOOTSEG, %eax
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mov %ax, %ss
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/*
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* make a little room on the stack for
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* us to save the default bootstring we might find..
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* effectively, we push the bootstring.
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*/
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data32
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mov $BOOTSTACK-64, %esp
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/* set up %es, (where we will load boot2 to) */
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mov %ax, %es
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push %es
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push %cx
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push %dx
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data32
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mov $0xa000, %eax
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mov %ax, %es
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addr32
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movb 0x501, %al
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testb $0x08, %al
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jnz hireso
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normal:
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/* set up graphic screen */
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movb $0x42, %ah
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movb $0xc0, %ch
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int $0x18
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movb $0x40, %ah
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int $0x18
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data32
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mov $0x0a00, %eax /* 80 x 25 mode */
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jmp 1f
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hireso:
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movb $0x08, %al /* set up RAM window */
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outb %al, $0x91
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movb $0x0a, %al
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outb %al, $0x93
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data32
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mov $0x0a10, %ax /* 80 x 31 mode */
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1:
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int $0x18
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movb $0x0c, %ah /* text on */
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int $0x18
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/* cursor home and on */
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xor %edx, %edx
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movb $0x13, %ah
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int $0x18
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movb $0x11, %ah
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int $0x18
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/* highreso no supported */
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addr32
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movb 0x501, %al
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testb $0x08, %al
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jz nothireso
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data32
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mov $ehireso, %esi
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data32
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call message
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hlt
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nothireso:
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/* keyboad reset */
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movb $0x03, %ah
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int $0x18
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/* transfer PC-9801 system common area to 0xa1000 */
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data32
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mov $0x0000, %esi
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data32
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mov $0x1000, %edi
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data32
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mov $0x0630, %ecx
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cld
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rep
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movsb
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/* transfer EPSON machine type to 0xa1200 */
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push %ds
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data32
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mov $0xfd00, %eax
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mov %ax, %ds
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addr32
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data32
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mov 0x804, %eax
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data32
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and $0x00ffffff, %eax
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addr32
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data32
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.byte 0x26
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mov %eax, %es: (0x1624)
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pop %ds
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pop %dx
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pop %cx
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pop %es
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/* bootstrap passes */
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mov %cs, %bx
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data32
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cmp $0x1fc0, %ebx
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jnz hd
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data32
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mov %ebp, %ecx
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data32
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mov %ebp, %edx
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addr32
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movb 0x584, %al
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andb $0xf0, %al
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cmpb $0x90, %al
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jnz hd
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fd:
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data32
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mov $0x0200, %ecx
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data32
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mov $0x0001, %edx
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movb $0xd6, %ah
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jmp load
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hd:
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data32
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and %ecx, %ecx
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jnz 1f
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addr32
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data32
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mov %cs: (boot_cyl), %ecx
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1:
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movb $0x06, %ah
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/*
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* BIOS call "INT 0x1B Function 0xn6" to read sectors from disk into memory
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* Call with %ah = 0xd6(for floppy disk) or 0x06(for hard disk)
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* %al = DA/UA
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* %bx = data length
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* %ch = sector size(for floppy) or cylinder(for hard)
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* %cl = cylinder
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* %dh = head
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* %dl = sector
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* %es:%bp = segment:offset of buffer
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* Return:
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* %ah = 0x0 on success; err code on failure
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*/
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load:
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#ifdef NAMEBLOCK
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/*
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* Load the second sector and see if it is a boot instruction block.
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* If it is then scan the contents for the first valid string and copy it to
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* the location of the default boot string.. then zero it out.
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* Finally write the block back to disk with the zero'd out entry..
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* I hate writing at this stage but we need this to be persistant.
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* If the boot fails, then the next boot will get the next string.
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* /etc/rc will regenerate a complete block2 iff teh boot succeeds.
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*
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* Format of block 2 is:
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* [NAMEBLOCKMAGIC] <--0xdeafc0de
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* [nulls]
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* [bootstring]NULL <---e.g. 0:wd(0,a)/kernel.experimental
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* [bootstring]NULL <---e.g. 0:wd(0,a)/kernel.old
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* ....
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* [bootstring]NULL <---e.g. 0:wd(0,f)/kernel
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* FF FF FF
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*/
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where:
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/*
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* save things we might smash
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* (that are not smashed immedatly after us anyway.)
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*/
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data32
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push %ecx /* preserve 'cyl,sector ' */
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data32
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push %edx
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/*
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* Load the second sector
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* BIOS call "INT 0x13 Function 0x2" to read sectors from disk into memory
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* Call with %ah = 0x2
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* %al = number of sectors
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* %ch = cylinder
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* %cl = sector
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* %dh = head
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* %dl = drive (0x80 for hard disk, 0x0 for floppy disk)
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* %es:%bx = segment:offset of buffer
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* Return:
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* %al = 0x0 on success; err code on failure
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*/
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data32
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movl $0x0201, %eax /function 2 (read) 1 sector */
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xor %ebx, %ebx /* %bx = 0 */ /* buffer address (ES:0) */
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data32
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movl $0x0002, %ecx /* sector 2, cylinder 0 */
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data32
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andl $0x00ff, %edx /* head 0, drive N */
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int $0x13
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data32
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jb read_error
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/*
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* confirm that it is one for us
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*/
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data32
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xorl %ebx, %ebx /* magic number at start of buffer */
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data32
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addr32
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movl %es:(%ebx), %eax
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data32
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cmpl $NAMEBLOCKMAGIC, %eax
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data32
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jne notours /* not ours so return to caller */
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/*
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* scan for a bootstring
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* Skip the magic number, and scan till we find a non-null,
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* or a -1
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*/
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incl %ebx /* quicker and smaller */
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incl %ebx
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incl %ebx
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scan:
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incl %ebx
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addr32
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movb %es:(%ebx), %al /* load the next byte */
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testb %al, %al /* and if it is null */
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data32 /* keep scanning (past deleted entries) */
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jz scan
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incb %al /* now look for -1 */
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data32
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jz notours /* if we reach the 0xFF then we have finished */
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/*
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* save our settings.. we need them twice..
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*/
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data32
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push %ebx
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/*
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* copy it to the default string location
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* which is just above the stack for 64 bytes.
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*/
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data32
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movl $BOOTSTACK-64, %ecx /* 64 bytes at the top of the stack */
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nxtbyte:
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addr32
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movb %es:(%ebx), %al /* get the next byte in */
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addr32
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movb %al, %es:(%ecx) /* and transfer it to the name buffer */
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incl %ebx /* get on with the next byte */
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incl %ecx /* get on with the next byte */
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testb %al, %al /* if it was 0 then quit this */
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data32
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jnz nxtbyte /* and looop if more to do */
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/*
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* restore the saved settings and
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* zero it out so next time we don't try it again
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*/
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data32
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pop %ebx /* get back our starting location */
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#ifdef NAMEBLOCK_WRITEBACK
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nxtbyte2:
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addr32
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movb %es:(%ebx), %al /* get the byte */
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addr32
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movb $0, %es:(%ebx) /* zero it out */
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data32
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incl %ebx /* point to the next byte */
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testb %al, %al /* check if we have finished.. */
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data32
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jne nxtbyte2
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/*
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* Write the second sector back
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* Load the second sector
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* BIOS call "INT 0x13 Function 0x3" to write sectors from memory to disk
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* Call with %ah = 0x3
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* %al = number of sectors
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* %ch = cylinder
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* %cl = sector
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* %dh = head
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* %dl = drive (0x80 for hard disk, 0x0 for floppy disk)
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* %es:%bx = segment:offset of buffer
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* Return:
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* %al = 0x0 on success; err code on failure
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*/
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data32
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movl $0x0301, %eax /* write 1 sector */
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xor %ebx, %ebx /* buffer is at offset 0 */
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data32
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movl $0x0002, %ecx /* block 2 */
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data32
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andl $0xff, %edx /* head 0 */
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int $0x13
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data32
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jnb notours
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data32
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mov $eread, %esi
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jmp err_stop
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#endif /* NAMEBLOCK_WRITEBACK */
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/*
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* return to the main-line
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*/
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notours:
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data32
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pop %edx
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data32
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pop %ecx
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#endif
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data32
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mov $LOADSZ, %ebx
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addr32
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movb 0x584, %al
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xor %ebp, %ebp /* %bp = 0, put it at 0 in the BOOTSEG */
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int $0x1b
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jc read_error
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/*
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* ljmp to the second stage boot loader (boot2).
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* After ljmp, %cs is BOOTSEG and boot1 (512 bytes) will be used
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* as an internal buffer "intbuf".
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*/
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data32
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ljmp $BOOTSEG, $ EXT(boot2)
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/*
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* read_error
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*/
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read_error:
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data32
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mov $eread, %esi
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err_stop:
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data32
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call message
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data32
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jmp stop
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/*
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* message: write the error message in %ds:%esi to console
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*/
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message:
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data32
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push %eax
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data32
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push %ebx
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push %ds
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push %es
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data32
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mov $0xe000, %eax
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mov %ax, %es
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addr32
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mov 0x501, %al
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testb $0x08, %al
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jnz 1f
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data32
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mov $0xa000, %eax
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mov %ax, %es
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1:
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mov %cs, %ax
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mov %ax, %ds
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addr32
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data32
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mov vram, %edi
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data32
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mov $0x00e1, %ebx
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cld
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nextb:
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lodsb /* load a byte into %al */
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cmpb $0x0, %al
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je done
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cmpb $0x0d, %al
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je cr_code
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cmpb $0x0a, %al
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je lf_code
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addr32
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movb %al, (%edi)
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addr32
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movb %bl, 0x2000(%edi)
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data32
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inc %edi
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data32
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inc %edi
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jmp nextb
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cr_code:
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data32
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add $80, %edi
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jmp nextb
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lf_code:
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data32
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mov %edi, %eax
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data32
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mov $80, %edx
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data32
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div %ebx
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data32
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sub %ebx, %edi
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jmp nextb
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done:
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addr32
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data32
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mov %edi, vram
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pop %es
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pop %ds
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data32
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pop %ebx
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data32
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pop %eax
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data32
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ret
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stop: hlt
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data32
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jmp stop /* halt doesnt actually halt forever */
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vram:
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.long 0
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/* error messages */
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|
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#ifdef DEBUG
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one: String "1-\0"
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two: String "2-\0"
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three: String "3-\0"
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four: String "4-\0"
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#endif DEBUG
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#ifdef NAMEBLOCK_WRITEBACK
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ewrite: String "Write error\r\n\0"
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#endif /* NAMEBLOCK_WRITEBACK */
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eread: String "Read error\r\n\0"
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enoboot: String "No bootable partition\r\n\0"
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endofcode:
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ehireso: String "Highreso not supported\r\n\0"
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/* the last 2 bytes in the sector 0 contain the signature */
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. = EXT(boot1) + 0x1fe
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.value SIGNATURE
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ENTRY(disklabel)
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. = EXT(boot1) + 0x400
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