mirror of
https://github.com/reactos/reactos.git
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Remove unused code.
svn path=/trunk/; revision=4459
This commit is contained in:
Eric Kohl
parent
4dc8e937b1
commit
1f8fe422c6
6 changed files with 0 additions and 1235 deletions
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@ -1,305 +0,0 @@
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;
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; File:
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; boot.asm
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; Description:
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; DOS-C boot
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;
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; Copyright (c) 1997;
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; Svante Frey
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; All Rights Reserved
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;
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; This file is part of DOS-C.
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;
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; DOS-C is free software; you can redistribute it and/or
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; modify it under the terms of the GNU General Public License
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; as published by the Free Software Foundation; either version
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; 2, or (at your option) any later version.
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;
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; DOS-C is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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; the GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public
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; License along with DOS-C; see the file COPYING. If not,
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; write to the Free Software Foundation, 675 Mass Ave,
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; Cambridge, MA 02139, USA.
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;
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; $Logfile: C:/dos-c/src/boot/boot.asv $
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;
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; $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/loaders/boot/Attic/boot.asm,v 1.4 2000/06/25 03:59:14 dwelch Exp $
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;
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; $Log: boot.asm,v $
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; Revision 1.4 2000/06/25 03:59:14 dwelch
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; Removed from redundant files from the mm directory
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; Added some preliminary work on the pager
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; Fixed ntoskrnl/mm/npool.c (This may have been the cause of the
|
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; problems reported with loading win32k.sys)
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; Fixed problems with reporting space used to store physical page
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; information
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; Added code to support MmSafeCopy{To/From}User interface work
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; (untested)
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; Added Event member of the PHYSICAL_PAGE structure to implement Philip
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; Susi's suggestion
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; Reworked section page-in code (not really tested)
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; Replaced inline string functions with gcc builtins to make debugging easier
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;
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; Revision 1.3 1998/08/25 04:37:43 rex
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; new release cleanup
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;
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; Revision 1.1.1.2 1998/08/25 04:27:38 rex
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; A much Needed Update
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;
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;
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; Rev 1.5 10 Jan 1997 4:58:06 patv
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; Corrected copyright
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;
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; Rev 1.4 10 Jan 1997 4:52:50 patv
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; Re-written to support C drive and eliminate restrictions on IPL.SYS
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;
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; Rev 1.3 29 Aug 1996 13:06:50 patv
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; Bug fixes for v0.91b
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;
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; Rev 1.2 01 Sep 1995 17:56:44 patv
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; First GPL release.
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;
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; Rev 1.1 30 Jul 1995 20:37:38 patv
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; Initialized stack before use.
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;
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; Rev 1.0 02 Jul 1995 10:57:52 patv
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; Initial revision.
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;
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section .text
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org 0
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Entry: jmp real_start
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; bp is initialized to 7c00h
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%define oem [bp+3]
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%define bytesPerSector [bp+0bh]
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%define sectPerCluster [bp+0dh]
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%define resSectors [bp+0eh]
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%define nFats [bp+10h]
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%define nRootDir [bp+11h]
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%define nSectors [bp+13h]
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%define MID [bp+15h]
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%define sectPerFat [bp+16h]
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%define sectPerTrack [bp+18h]
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%define nHeads [bp+1ah]
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%define nHidden [bp+1ch]
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%define nHidden_hi [bp+1eh]
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%define nSectorHuge [bp+20h]
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%define drive [bp+24h]
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%define extBoot [bp+26h]
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%define volid [bp+27h]
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%define vollabel [bp+2bh]
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%define filesys 36h
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LOADSEG equ 2000h
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FATBUF equ 4000h ; offset of temporary buffer for FAT
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; chain
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RETRYCOUNT equ 5 ; number of retries on disk errors
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; Some extra variables that are created on the stack frame
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%define fat_start [bp-4] ; first FAT sector
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%define fat_start_hi [bp-2]
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%define root_dir_start [bp-8] ; first root directory sector
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%define root_dir_start_hi [bp-6]
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%define data_start [bp-12] ; first data sector
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%define data_start_hi [bp-10]
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;
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; Include macros for filesystem access
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;
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%include "boot.inc"
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;
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;
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;
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TIMES 3eh-($-$$) DB 0
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%define tempbuf [bp+3eh]
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load_seg dw LOADSEG
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real_start: cli
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cld
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mov ax, cs
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mov ss, ax ; initialize stack
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mov bp, 7c00h
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lea sp, [bp-20h]
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sti
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mov es, ax
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mov ds, ax
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mov drive, dl ; BIOS passes drive number in DL
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GETDRIVEPARMS
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FINDFILE ; locate file in root directory
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jc boot_error ; fail if not found
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GETFATCHAIN ; read FAT chain
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LOADFILE ; load file (jumps to boot_sucess if successful)
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boot_error: mov cx, ERRMSGLEN
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mov si, errmsg+7c00h
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next_char: lodsb ; print error message
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mov ah, 0eh
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xor bh, bh
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int 10h
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loop next_char
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xor ah, ah
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int 16h ; wait for keystroke
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int 19h ; invoke bootstrap loader
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boot_success: mov dl, drive
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db 0eah ; far jump to LOADSEG:0000
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dw 0
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dw LOADSEG
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; readDisk: Reads a number of sectors into memory.
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;
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; Call with: DX:AX = 32-bit DOS sector number
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; DI = number of sectors to read
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; ES:BX = destination buffer
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; ES must be 64k aligned (1000h, 2000h etc).
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;
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; Returns: CF set on error
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; ES:BX points one byte after the last byte read.
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readDisk:
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push si
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read_next: push dx
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push ax
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;
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; translate sector number to BIOS parameters
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;
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;
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; abs = sector offset in track
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; + head * sectPerTrack offset in cylinder
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; + track * sectPerTrack * nHeads offset in platter
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;
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; t1 = abs / sectPerTrack (ax has t1)
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; sector = abs mod sectPerTrack (cx has sector)
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;
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div word sectPerTrack
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mov cx, dx
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;
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; t1 = head + track * nHeads
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;
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; track = t1 / nHeads (ax has track)
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; head = t1 mod nHeads (dl has head)
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;
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xor dx, dx
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div word nHeads
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; the following manipulations are necessary in order to
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; properly place parameters into registers.
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; ch = cylinder number low 8 bits
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; cl = 7-6: cylinder high two bits
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; 5-0: sector
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mov dh, dl ; save head into dh for bios
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ror ah, 1 ; move track high bits into
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ror ah, 1 ; bits 7-6 (assumes top = 0)
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xchg al, ah ; swap for later
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mov dl, byte sectPerTrack
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sub dl, cl
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inc cl ; sector offset from 1
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or cx, ax ; merge cylinder into sector
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mov al, dl ; al has # of sectors left
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; Calculate how many sectors can be transfered in this read
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; due to dma boundary conditions.
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push dx
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mov si, di ; temp register save
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; this computes remaining bytes because of modulo 65536
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; nature of dma boundary condition
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mov ax, bx ; get offset pointer
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neg ax ; and convert to bytes
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jz ax_min_1 ; started at seg:0, skip ahead
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xor dx, dx ; convert to sectors
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div word bytesPerSector
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cmp ax, di ; check remainder vs. asked
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jb ax_min_1 ; less, skip ahead
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mov si, ax ; transfer only what we can
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ax_min_1: pop dx
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; Check that request sectors do not exceed track boundary
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mov si, sectPerTrack
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inc si
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mov ax, cx ; get the sector/cyl byte
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and ax, 03fh ; and mask out sector
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sub si, ax ; si has how many we can read
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mov ax, di
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cmp si, di ; see if asked <= available
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jge ax_min_2
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mov ax, si ; get what can be xfered
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ax_min_2: mov si, RETRYCOUNT
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mov ah, 2
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mov dl, drive
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retry: push ax
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int 13h
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pop ax
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jnc read_ok
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push ax
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xor ax, ax ; reset the drive
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int 13h
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pop ax
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dec si
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jnz retry
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stc
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pop ax
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pop dx
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pop si
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ret
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read_next_jmp: jmp short read_next
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read_ok: xor ah, ah
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mov si, ax ; AX = SI = number of sectors read
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mul word bytesPerSector ; AX = number of bytes read
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add bx, ax ; add number of bytes read to BX
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jnc no_incr_es ; if overflow...
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mov ax, es
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add ah, 10h ; ...add 1000h to ES
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mov es, ax
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no_incr_es: pop ax
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pop dx ; DX:AX = last sector number
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add ax, si
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adc dx, 0 ; DX:AX = next sector to read
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sub di, si ; if there is anything left to read,
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jg read_next_jmp ; continue
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clc
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pop si
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ret
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errmsg db "Boot error"
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ERRMSGLEN equ $ - errmsg
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;filename db "OSLDR BIN"
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filename db "KERNEL BIN"
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TIMES 510-($-$$) DB 0
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sign dw 0aa55h
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@ -1,196 +0,0 @@
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; To save space, functions that are just called once are
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; implemented as macros instead. Four bytes are saved by
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; avoiding the call / ret instructions.
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; FINDFILE: Searches for the file in the root directory.
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;
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; Returns:
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;
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; If file not found: CF set
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;
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; If file found: CF clear
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; AX = first cluster of file
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%macro FINDFILE 0
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; First, read the whole root directory
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; into the temporary buffer.
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mov ax, word root_dir_start
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mov dx, word root_dir_start_hi
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mov di, nRootDir
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xor bx, bx
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mov es, tempbuf
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call readDisk
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jc ffDone
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xor di, di
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next_entry: mov cx, 11
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mov si, filename+7c00h
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push di
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repe cmpsb
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pop di
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mov ax, [es:di+1ah] ; get cluster number from directory entry
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clc
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je ffDone
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add di, 20h ; go to next directory entry
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cmp byte [es:di], 0 ; if the first byte of the name is 0,
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jnz next_entry ; there is no more files in the directory
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stc
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ffDone:
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%endmacro
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; GETDRIVEPARMS: Calculate start of some disk areas.
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%macro GETDRIVEPARMS 0
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mov si, word nHidden
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mov di, word nHidden_hi
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add si, word resSectors
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adc di, 0 ; DI:SI = first FAT sector
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mov word fat_start, si
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mov word fat_start_hi, di
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mov al, nFats
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xor ah, ah
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mul word sectPerFat ; DX:AX = total number of FAT sectors
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add si, ax
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adc di, dx ; DI:SI = first root directory sector
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mov word root_dir_start, si
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mov word root_dir_start_hi, di
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; Calculate how many sectors the root directory occupies.
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mov bx, bytesPerSector
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mov cl, 5 ; divide BX by 32
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shr bx, cl ; BX = directory entries per sector
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mov ax, nRootDir
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xor dx, dx
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div bx
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mov nRootDir, ax ; AX = sectors per root directory
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add si, ax
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adc di, 0 ; DI:SI = first data sector
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mov data_start, si
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mov data_start_hi, di
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%endmacro
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; GETFATCHAIN:
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;
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; Reads the FAT chain and stores it in a temporary buffer in the first
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; 64 kb. The FAT chain is stored an array of 16-bit cluster numbers,
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; ending with 0.
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;
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; The file must fit in conventional memory, so it can't be larger than
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; 640 kb. The sector size must be at least 512 bytes, so the FAT chain
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; can't be larger than around 3 kb.
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;
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; Call with: AX = first cluster in chain
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;
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; Returns: CF clear on success, set on error
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%macro GETFATCHAIN 0
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push ax ; store first cluster number
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; Load the complete FAT into memory. The FAT can't be larger
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; than 128 kb, so it should fit in the temporary buffer.
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mov es, tempbuf
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xor bx, bx
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mov di, sectPerFat
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mov ax, word fat_start
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mov dx, word fat_start_hi
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call readDisk
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pop ax ; restore first cluster number
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jc boot_error
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; Set ES:DI to the temporary storage for the FAT chain.
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push ds
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push es
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pop ds
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pop es
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mov di, FATBUF
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next_clust: stosw ; store cluster number
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mov si, ax ; SI = cluster number
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cmp byte extBoot, 29h
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jne fat_12
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cmp byte [bp+filesys+4], '6' ; check for FAT-16 system
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je fat_16
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; This is a FAT-12 disk.
|
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|
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fat_12: add si, si ; multiply cluster number by 3...
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add si, ax
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shr si, 1 ; ...and divide by 2
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lodsw
|
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|
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; If the cluster number was even, the cluster value is now in
|
||||
; bits 0-11 of AX. If the cluster number was odd, the cluster
|
||||
; value is in bits 4-15, and must be shifted right 4 bits. If
|
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; the number was odd, CF was set in the last shift instruction.
|
||||
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jnc fat_even
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mov cl, 4
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shr ax, cl ; shift the cluster number
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||||
|
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fat_even: and ah, 0fh ; mask off the highest 4 bits
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cmp ax, 0fffh ; check for EOF
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jmp short next_test
|
||||
|
||||
; This is a FAT-16 disk. The maximal size of a 16-bit FAT
|
||||
; is 128 kb, so it may not fit within a single 64 kb segment.
|
||||
|
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fat_16: mov dx, tempbuf
|
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add si, si ; multiply cluster number by two
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jnc first_half ; if overflow...
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||||
add dh, 10h ; ...add 64 kb to segment value
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||||
|
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first_half: mov ds, dx ; DS:SI = pointer to next cluster
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lodsw ; AX = next cluster
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cmp ax, 0fff8h ; >= FFF8 = 16-bit EOF
|
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next_test: jb next_clust ; continue if not EOF
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||||
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finished: ; Mark end of FAT chain with 0, so we have a single
|
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; EOF marker for both FAT-12 and FAT-16 systems.
|
||||
|
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xor ax, ax
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stosw
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fatError:
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%endmacro
|
||||
|
||||
|
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; loadFile: Loads the file into memory, one cluster at a time.
|
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|
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%macro LOADFILE 0
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mov es, tempbuf ; set ES:BX to load address
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xor bx, bx
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|
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mov si, FATBUF ; set DS:SI to the FAT chain
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push cs
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pop ds
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||||
|
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next_cluster: lodsw ; AX = next cluster to read
|
||||
or ax, ax ; if EOF...
|
||||
je boot_success ; ...boot was successful
|
||||
|
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dec ax ; cluster numbers start with 2
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dec ax
|
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|
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mov di, word sectPerCluster
|
||||
and di, 0ffh ; DI = sectors per cluster
|
||||
mul di
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add ax, data_start
|
||||
adc dx, data_start_hi ; DX:AX = first sector to read
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||||
call readDisk
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||||
jnc next_cluster
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||||
|
||||
%endmacro
|
||||
|
|
@ -1,73 +0,0 @@
|
|||
#
|
||||
# makefile for DOS-C boot
|
||||
#
|
||||
# $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/loaders/boot/Attic/boot.mak,v 1.4 2000/06/25 03:59:14 dwelch Exp $
|
||||
#
|
||||
# $Log: boot.mak,v $
|
||||
# Revision 1.4 2000/06/25 03:59:14 dwelch
|
||||
# Removed from redundant files from the mm directory
|
||||
# Added some preliminary work on the pager
|
||||
# Fixed ntoskrnl/mm/npool.c (This may have been the cause of the
|
||||
# problems reported with loading win32k.sys)
|
||||
# Fixed problems with reporting space used to store physical page
|
||||
# information
|
||||
# Added code to support MmSafeCopy{To/From}User interface work
|
||||
# (untested)
|
||||
# Added Event member of the PHYSICAL_PAGE structure to implement Philip
|
||||
# Susi's suggestion
|
||||
# Reworked section page-in code (not really tested)
|
||||
# Replaced inline string functions with gcc builtins to make debugging easier
|
||||
#
|
||||
# Revision 1.3 1998/08/25 04:39:40 rex
|
||||
# Release cleanup
|
||||
#
|
||||
# Revision 1.1.1.2 1998/08/25 04:27:38 rex
|
||||
# A much Needed Update
|
||||
#
|
||||
#
|
||||
# Rev 1.3 10 Jan 1997 4:51:54 patv
|
||||
#Changed to use FreeDOS exe2bin and support new boot code
|
||||
#
|
||||
# Rev 1.2 17 Dec 1996 12:52:32 patv
|
||||
#Converted to FreeDOS exe2bin.
|
||||
#.
|
||||
#d
|
||||
#
|
||||
# Rev 1.1 29 Aug 1996 13:06:50 patv
|
||||
#Bug fixes for v0.91b
|
||||
#
|
||||
# Rev 1.0 02 Jul 1995 9:11:26 patv
|
||||
#Initial revision.
|
||||
#
|
||||
|
||||
#
|
||||
# Uncomment the following for a debug version
|
||||
#
|
||||
#AFLAGS = /zi /DDEBUG
|
||||
#LFLAGS = /v
|
||||
|
||||
PRODUCT = boot.bin
|
||||
|
||||
all: $(PRODUCT)
|
||||
|
||||
production: all
|
||||
copy boot.bin ..\..\dist\boot.bin
|
||||
del *.bin
|
||||
del *.map
|
||||
|
||||
boot.bin: boot.asm
|
||||
tasm $(AFLAGS) boot,,
|
||||
tlink $(LFLAGS) boot
|
||||
..\utils\exe2bin boot boot.bin
|
||||
del boot.obj
|
||||
del boot.exe
|
||||
|
||||
clean:
|
||||
del *.lst
|
||||
del *.map
|
||||
del *.bin
|
||||
del *.bak
|
||||
del *.las
|
||||
del *.obj
|
||||
del *.exe
|
||||
|
||||
|
|
@ -1,309 +0,0 @@
|
|||
;
|
||||
; File:
|
||||
; boot.asm
|
||||
; Description:
|
||||
; DOS-C boot
|
||||
;
|
||||
; Copyright (c) 1997;
|
||||
; Svante Frey
|
||||
; All Rights Reserved
|
||||
;
|
||||
; This file is part of DOS-C.
|
||||
;
|
||||
; DOS-C is free software; you can redistribute it and/or
|
||||
; modify it under the terms of the GNU General Public License
|
||||
; as published by the Free Software Foundation; either version
|
||||
; 2, or (at your option) any later version.
|
||||
;
|
||||
; DOS-C is distributed in the hope that it will be useful, but
|
||||
; WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
|
||||
; the GNU General Public License for more details.
|
||||
;
|
||||
; You should have received a copy of the GNU General Public
|
||||
; License along with DOS-C; see the file COPYING. If not,
|
||||
; write to the Free Software Foundation, 675 Mass Ave,
|
||||
; Cambridge, MA 02139, USA.
|
||||
;
|
||||
; $Logfile: C:/dos-c/src/boot/boot.asv $
|
||||
;
|
||||
; $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/loaders/boot/Attic/bootbk.asm,v 1.4 2000/06/25 03:59:14 dwelch Exp $
|
||||
;
|
||||
; $Log: bootbk.asm,v $
|
||||
; Revision 1.4 2000/06/25 03:59:14 dwelch
|
||||
; Removed from redundant files from the mm directory
|
||||
; Added some preliminary work on the pager
|
||||
; Fixed ntoskrnl/mm/npool.c (This may have been the cause of the
|
||||
; problems reported with loading win32k.sys)
|
||||
; Fixed problems with reporting space used to store physical page
|
||||
; information
|
||||
; Added code to support MmSafeCopy{To/From}User interface work
|
||||
; (untested)
|
||||
; Added Event member of the PHYSICAL_PAGE structure to implement Philip
|
||||
; Susi's suggestion
|
||||
; Reworked section page-in code (not really tested)
|
||||
; Replaced inline string functions with gcc builtins to make debugging easier
|
||||
;
|
||||
; Revision 1.3 1998/08/25 04:40:47 rex
|
||||
; Release cleanup
|
||||
;
|
||||
; Revision 1.1.1.2 1998/08/25 04:27:38 rex
|
||||
; A much Needed Update
|
||||
;
|
||||
;
|
||||
; Rev 1.5 10 Jan 1997 4:58:06 patv
|
||||
; Corrected copyright
|
||||
;
|
||||
; Rev 1.4 10 Jan 1997 4:52:50 patv
|
||||
; Re-written to support C drive and eliminate restrictions on IPL.SYS
|
||||
;
|
||||
; Rev 1.3 29 Aug 1996 13:06:50 patv
|
||||
; Bug fixes for v0.91b
|
||||
;
|
||||
; Rev 1.2 01 Sep 1995 17:56:44 patv
|
||||
; First GPL release.
|
||||
;
|
||||
; Rev 1.1 30 Jul 1995 20:37:38 patv
|
||||
; Initialized stack before use.
|
||||
;
|
||||
; Rev 1.0 02 Jul 1995 10:57:52 patv
|
||||
; Initial revision.
|
||||
;
|
||||
|
||||
.text
|
||||
|
||||
BASE equ 0
|
||||
|
||||
|
||||
org BASE
|
||||
Entry: jmp real_start
|
||||
|
||||
; bp is initialized to 7c00h
|
||||
oem equ [bp+3]
|
||||
bytesPerSector equ [bp+0bh]
|
||||
sectPerCluster equ [bp+0dh]
|
||||
resSectors equ [bp+0eh]
|
||||
nFats equ [bp+10h]
|
||||
nRootDir equ [bp+11h]
|
||||
nSectors equ [bp+13h]
|
||||
MID equ [bp+15h]
|
||||
sectPerFat equ [bp+16h]
|
||||
sectPerTrack equ [bp+18h]
|
||||
nHeads equ [bp+1ah]
|
||||
nHidden equ [bp+1ch]
|
||||
nSectorHuge equ [bp+20h]
|
||||
drive equ [bp+24h]
|
||||
extBoot equ [bp+26h]
|
||||
volid equ [bp+27h]
|
||||
vollabel equ [bp+2bh]
|
||||
filesys equ [bp+36h]
|
||||
|
||||
LOADSEG equ 2000h
|
||||
|
||||
FATBUF equ 4000h ; offset of temporary buffer for FAT
|
||||
; chain
|
||||
RETRYCOUNT equ 5 ; number of retries on disk errors
|
||||
|
||||
; Some extra variables that are created on the stack frame
|
||||
|
||||
fat_start equ [bp-4] ; first FAT sector
|
||||
root_dir_start equ [bp-8] ; first root directory sector
|
||||
data_start equ [bp-12] ; first data sector
|
||||
|
||||
|
||||
;
|
||||
; Include macros for filesystem access
|
||||
;
|
||||
include boot.inc
|
||||
|
||||
;
|
||||
;
|
||||
;
|
||||
org BASE+3eh
|
||||
|
||||
tempbuf equ [bp+3eh]
|
||||
load_seg dw LOADSEG
|
||||
|
||||
real_start: cli
|
||||
cld
|
||||
mov ax, cs
|
||||
mov ss, ax ; initialize stack
|
||||
mov bp, 7c00h
|
||||
lea sp, [bp-20h]
|
||||
sti
|
||||
|
||||
mov es, ax
|
||||
mov ds, ax
|
||||
mov drive, dl ; BIOS passes drive number in DL
|
||||
|
||||
GETDRIVEPARMS
|
||||
|
||||
FINDFILE ; locate file in root directory
|
||||
jc boot_error ; fail if not found
|
||||
|
||||
GETFATCHAIN ; read FAT chain
|
||||
LOADFILE ; load file (jumps to boot_sucess if successful)
|
||||
|
||||
boot_error: mov cx, ERRMSGLEN
|
||||
mov si, offset errmsg+7c00h
|
||||
|
||||
next_char: lodsb ; print error message
|
||||
mov ah, 0eh
|
||||
xor bh, bh
|
||||
int 10h
|
||||
loop next_char
|
||||
|
||||
xor ah, ah
|
||||
int 16h ; wait for keystroke
|
||||
int 19h ; invoke bootstrap loader
|
||||
|
||||
boot_success: mov dl, drive
|
||||
|
||||
db 0eah ; far jump to LOADSEG:0000
|
||||
dw 0
|
||||
dw LOADSEG
|
||||
|
||||
|
||||
; readDisk: Reads a number of sectors into memory.
|
||||
;
|
||||
; Call with: DX:AX = 32-bit DOS sector number
|
||||
; DI = number of sectors to read
|
||||
; ES:BX = destination buffer
|
||||
; ES must be 64k aligned (1000h, 2000h etc).
|
||||
;
|
||||
; Returns: CF set on error
|
||||
; ES:BX points one byte after the last byte read.
|
||||
|
||||
readDisk proc
|
||||
push si
|
||||
read_next: push dx
|
||||
push ax
|
||||
|
||||
;
|
||||
; translate sector number to BIOS parameters
|
||||
;
|
||||
|
||||
;
|
||||
; abs = sector offset in track
|
||||
; + head * sectPerTrack offset in cylinder
|
||||
; + track * sectPerTrack * nHeads offset in platter
|
||||
;
|
||||
; t1 = abs / sectPerTrack (ax has t1)
|
||||
; sector = abs mod sectPerTrack (cx has sector)
|
||||
;
|
||||
div word ptr sectPerTrack
|
||||
mov cx, dx
|
||||
|
||||
;
|
||||
; t1 = head + track * nHeads
|
||||
;
|
||||
; track = t1 / nHeads (ax has track)
|
||||
; head = t1 mod nHeads (dl has head)
|
||||
;
|
||||
xor dx, dx
|
||||
div word ptr nHeads
|
||||
|
||||
; the following manipulations are necessary in order to
|
||||
; properly place parameters into registers.
|
||||
; ch = cylinder number low 8 bits
|
||||
; cl = 7-6: cylinder high two bits
|
||||
; 5-0: sector
|
||||
mov dh, dl ; save head into dh for bios
|
||||
ror ah, 1 ; move track high bits into
|
||||
ror ah, 1 ; bits 7-6 (assumes top = 0)
|
||||
xchg al, ah ; swap for later
|
||||
mov dl, byte ptr sectPerTrack
|
||||
sub dl, cl
|
||||
inc cl ; sector offset from 1
|
||||
or cx, ax ; merge cylinder into sector
|
||||
mov al, dl ; al has # of sectors left
|
||||
|
||||
; Calculate how many sectors can be transfered in this read
|
||||
; due to dma boundary conditions.
|
||||
push dx
|
||||
|
||||
mov si, di ; temp register save
|
||||
; this computes remaining bytes because of modulo 65536
|
||||
; nature of dma boundary condition
|
||||
mov ax, bx ; get offset pointer
|
||||
neg ax ; and convert to bytes
|
||||
jz ax_min_1 ; started at seg:0, skip ahead
|
||||
|
||||
xor dx, dx ; convert to sectors
|
||||
div word ptr bytesPerSector
|
||||
|
||||
cmp ax, di ; check remainder vs. asked
|
||||
jb ax_min_1 ; less, skip ahead
|
||||
mov si, ax ; transfer only what we can
|
||||
|
||||
ax_min_1: pop dx
|
||||
|
||||
; Check that request sectors do not exceed track boundary
|
||||
mov si, sectPerTrack
|
||||
inc si
|
||||
mov ax, cx ; get the sector/cyl byte
|
||||
and ax, 03fh ; and mask out sector
|
||||
sub si, ax ; si has how many we can read
|
||||
mov ax, di
|
||||
cmp si, di ; see if asked <= available
|
||||
jge ax_min_2
|
||||
mov ax, si ; get what can be xfered
|
||||
|
||||
ax_min_2: mov si, RETRYCOUNT
|
||||
mov ah, 2
|
||||
mov dl, drive
|
||||
|
||||
retry: push ax
|
||||
int 13h
|
||||
pop ax
|
||||
jnc read_ok
|
||||
push ax
|
||||
xor ax, ax ; reset the drive
|
||||
int 13h
|
||||
pop ax
|
||||
dec si
|
||||
jnz retry
|
||||
stc
|
||||
pop ax
|
||||
pop dx
|
||||
pop si
|
||||
ret
|
||||
|
||||
read_next_jmp: jmp short read_next
|
||||
read_ok: xor ah, ah
|
||||
mov si, ax ; AX = SI = number of sectors read
|
||||
mul word ptr bytesPerSector ; AX = number of bytes read
|
||||
add bx, ax ; add number of bytes read to BX
|
||||
jnc no_incr_es ; if overflow...
|
||||
|
||||
mov ax, es
|
||||
add ah, 10h ; ...add 1000h to ES
|
||||
mov es, ax
|
||||
|
||||
no_incr_es: pop ax
|
||||
pop dx ; DX:AX = last sector number
|
||||
|
||||
add ax, si
|
||||
adc dx, 0 ; DX:AX = next sector to read
|
||||
sub di, si ; if there is anything left to read,
|
||||
jg read_next_jmp ; continue
|
||||
|
||||
clc
|
||||
pop si
|
||||
ret
|
||||
readDisk endp
|
||||
|
||||
errmsg db "Boot error"
|
||||
ERRMSGLEN equ $ - errmsg
|
||||
|
||||
|
||||
;filename db "OSLDR BIN"
|
||||
filename db "KERNEL BIN"
|
||||
|
||||
org BASE+01feh
|
||||
sign dw 0aa55h
|
||||
|
||||
TEXT ENDS
|
||||
end
|
||||
|
||||
|
||||
|
|
@ -1,340 +0,0 @@
|
|||
;
|
||||
; Loads the kernel and any required modules
|
||||
;
|
||||
|
||||
org 0
|
||||
|
||||
;
|
||||
; Segment where we are loaded
|
||||
;
|
||||
LOADSEG equ 02000h
|
||||
|
||||
;
|
||||
; Segment used for temporay storage
|
||||
;
|
||||
WORKSEG equ 01000h
|
||||
|
||||
|
||||
KERNELBASE equ 05000h
|
||||
|
||||
;
|
||||
; Offsets of work areas
|
||||
;
|
||||
FAT_CHAIN equ 0h
|
||||
|
||||
DIR_BUFFER equ 4000h
|
||||
END_DIR_BUFFER equ 0ffe0h
|
||||
|
||||
FAT_SEG equ 03000h
|
||||
|
||||
|
||||
;
|
||||
; These are all on the stack
|
||||
;
|
||||
%define oem [bp+3]
|
||||
%define bytesPerSector [bp+0bh]
|
||||
%define sectPerCluster [bp+0dh]
|
||||
%define resSectors [bp+0eh]
|
||||
%define nFats [bp+10h]
|
||||
%define nRootDir [bp+11h]
|
||||
%define nSectors [bp+13h]
|
||||
%define MID [bp+15h]
|
||||
%define sectPerFat [bp+16h]
|
||||
%define sectPerTrack [bp+18h]
|
||||
%define nHeads [bp+1ah]
|
||||
%define nHidden [bp+1ch]
|
||||
%define nHidden_hi [bp+1eh]
|
||||
%define nSectorHuge [bp+20h]
|
||||
%define drive [bp+24h]
|
||||
%define extBoot [bp+26h]
|
||||
%define volid [bp+27h]
|
||||
%define vollabel [bp+2bh]
|
||||
%define filesys 36h
|
||||
|
||||
RETRYCOUNT equ 5
|
||||
|
||||
%define fat_start [bp-4] ; first FAT sector
|
||||
%define fat_start_hi [bp-2]
|
||||
%define root_dir_start [bp-8] ; first root directory sector
|
||||
%define root_dir_start_hi [bp-6]
|
||||
%define data_start [bp-12] ; first data sector
|
||||
%define data_start_hi [bp-10]
|
||||
|
||||
|
||||
entry:
|
||||
mov drive,dl
|
||||
|
||||
mov ax,LOADSEG
|
||||
mov ds,ax
|
||||
|
||||
|
||||
;
|
||||
; Print out a message
|
||||
;
|
||||
mov di,loadmsg
|
||||
call printmsg
|
||||
|
||||
|
||||
;
|
||||
; Check here for shift pressed and if so display boot menu
|
||||
;
|
||||
|
||||
;
|
||||
; Load the entire fat
|
||||
;
|
||||
; mov ax,fat_start
|
||||
; mov dx,fat_start_hi
|
||||
; mov di,sectPerFat
|
||||
; mov ax,FAT_SEG
|
||||
; mov es,ax
|
||||
; mov bx,0
|
||||
; call readDisk
|
||||
|
||||
|
||||
;
|
||||
; Load root directory
|
||||
;
|
||||
mov ax,WORKSEG
|
||||
mov es,ax
|
||||
|
||||
mov dx,root_dir_start_hi
|
||||
mov ax,root_dir_start
|
||||
mov bx,DIR_BUFFER
|
||||
mov di,nRootDir
|
||||
shr di,4
|
||||
mov di,1
|
||||
call readDisk
|
||||
jc disk_error
|
||||
|
||||
;
|
||||
; Look for a directory called boot
|
||||
;
|
||||
mov di,DIR_BUFFER
|
||||
cld
|
||||
mov cx,4
|
||||
l1:
|
||||
mov si,boot_dir_name
|
||||
; cmp byte [di],0
|
||||
; je boot_error
|
||||
repe cmpsb
|
||||
je found_it
|
||||
or di,31
|
||||
inc di
|
||||
cmp di,END_DIR_BUFFER
|
||||
jge boot_error
|
||||
jmp l1
|
||||
|
||||
|
||||
boot_error:
|
||||
mov di,errormsg
|
||||
call printmsg
|
||||
l3:
|
||||
jmp l3
|
||||
|
||||
disk_error:
|
||||
mov di,errormsg1
|
||||
call printmsg
|
||||
jmp l3
|
||||
|
||||
|
||||
|
||||
found_it:
|
||||
mov di,msg1
|
||||
call printmsg
|
||||
|
||||
;
|
||||
; Load the boot directory found above
|
||||
;
|
||||
sub di,4
|
||||
call readFile
|
||||
|
||||
l2:
|
||||
jmp l2
|
||||
|
||||
;
|
||||
; readFile
|
||||
;
|
||||
%define file_length [di+01ch]
|
||||
%define start_cluster [di+01ah]
|
||||
readFile:
|
||||
cmp byte extBoot, 29h
|
||||
jne fat_12
|
||||
cmp byte [bp+filesys+4], '6' ; check for FAT-16 system
|
||||
je fat_16
|
||||
|
||||
fat_12:
|
||||
mov di,msg2
|
||||
call printmsg
|
||||
l4:
|
||||
jmp l4
|
||||
|
||||
fat_16:
|
||||
mov di,msg3
|
||||
call printmsg
|
||||
jmp l4
|
||||
|
||||
|
||||
|
||||
; readDisk: Reads a number of sectors into memory.
|
||||
;
|
||||
; Call with: DX:AX = 32-bit DOS sector number
|
||||
; DI = number of sectors to read
|
||||
; ES:BX = destination buffer
|
||||
; ES must be 64k aligned (1000h, 2000h etc).
|
||||
;
|
||||
; Returns: CF set on error
|
||||
; ES:BX points one byte after the last byte read.
|
||||
|
||||
readDisk:
|
||||
push bp
|
||||
push si
|
||||
read_next: push dx
|
||||
push ax
|
||||
|
||||
;
|
||||
; translate sector number to BIOS parameters
|
||||
;
|
||||
|
||||
;
|
||||
; abs = sector offset in track
|
||||
; + head * sectPerTrack offset in cylinder
|
||||
; + track * sectPerTrack * nHeads offset in platter
|
||||
;
|
||||
; t1 = abs / sectPerTrack (ax has t1)
|
||||
; sector = abs mod sectPerTrack (cx has sector)
|
||||
;
|
||||
div word sectPerTrack
|
||||
mov cx, dx
|
||||
|
||||
;
|
||||
; t1 = head + track * nHeads
|
||||
;
|
||||
; track = t1 / nHeads (ax has track)
|
||||
; head = t1 mod nHeads (dl has head)
|
||||
;
|
||||
xor dx, dx
|
||||
div word nHeads
|
||||
|
||||
; the following manipulations are necessary in order to
|
||||
; properly place parameters into registers.
|
||||
; ch = cylinder number low 8 bits
|
||||
; cl = 7-6: cylinder high two bits
|
||||
; 5-0: sector
|
||||
mov dh, dl ; save head into dh for bios
|
||||
ror ah, 1 ; move track high bits into
|
||||
ror ah, 1 ; bits 7-6 (assumes top = 0)
|
||||
xchg al, ah ; swap for later
|
||||
mov dl, byte sectPerTrack
|
||||
sub dl, cl
|
||||
inc cl ; sector offset from 1
|
||||
or cx, ax ; merge cylinder into sector
|
||||
mov al, dl ; al has # of sectors left
|
||||
|
||||
; Calculate how many sectors can be transfered in this read
|
||||
; due to dma boundary conditions.
|
||||
push dx
|
||||
|
||||
mov si, di ; temp register save
|
||||
; this computes remaining bytes because of modulo 65536
|
||||
; nature of dma boundary condition
|
||||
mov ax, bx ; get offset pointer
|
||||
neg ax ; and convert to bytes
|
||||
jz ax_min_1 ; started at seg:0, skip ahead
|
||||
|
||||
xor dx, dx ; convert to sectors
|
||||
div word bytesPerSector
|
||||
|
||||
cmp ax, di ; check remainder vs. asked
|
||||
jb ax_min_1 ; less, skip ahead
|
||||
mov si, ax ; transfer only what we can
|
||||
|
||||
ax_min_1: pop dx
|
||||
|
||||
; Check that request sectors do not exceed track boundary
|
||||
mov si, sectPerTrack
|
||||
inc si
|
||||
mov ax, cx ; get the sector/cyl byte
|
||||
and ax, 03fh ; and mask out sector
|
||||
sub si, ax ; si has how many we can read
|
||||
mov ax, di
|
||||
cmp si, di ; see if asked <= available
|
||||
jge ax_min_2
|
||||
mov ax, si ; get what can be xfered
|
||||
|
||||
ax_min_2: mov si, RETRYCOUNT
|
||||
mov ah, 2
|
||||
mov dl, drive
|
||||
|
||||
retry: push ax
|
||||
int 13h
|
||||
pop ax
|
||||
jnc read_ok
|
||||
push ax
|
||||
xor ax, ax ; reset the drive
|
||||
int 13h
|
||||
pop ax
|
||||
dec si
|
||||
jnz retry
|
||||
stc
|
||||
pop ax
|
||||
pop dx
|
||||
pop si
|
||||
pop bp
|
||||
ret
|
||||
|
||||
read_next_jmp: jmp short read_next
|
||||
read_ok: xor ah, ah
|
||||
mov si, ax ; AX = SI = number of sectors read
|
||||
mul word bytesPerSector ; AX = number of bytes read
|
||||
add bx, ax ; add number of bytes read to BX
|
||||
jnc no_incr_es ; if overflow...
|
||||
|
||||
mov ax, es
|
||||
add ah, 10h ; ...add 1000h to ES
|
||||
mov es, ax
|
||||
|
||||
no_incr_es: pop ax
|
||||
pop dx ; DX:AX = last sector number
|
||||
|
||||
add ax, si
|
||||
adc dx, 0 ; DX:AX = next sector to read
|
||||
sub di, si ; if there is anything left to read,
|
||||
jg read_next_jmp ; continue
|
||||
|
||||
clc
|
||||
pop si
|
||||
pop bp
|
||||
ret
|
||||
|
||||
;
|
||||
; Print string (DI = start)
|
||||
;
|
||||
printmsg:
|
||||
push ax
|
||||
push bx
|
||||
push di
|
||||
mov ah,0eh
|
||||
mov bh,0
|
||||
mov bl,07h
|
||||
.l1
|
||||
mov al,[di]
|
||||
cmp al,0
|
||||
je .l2
|
||||
inc di
|
||||
int 10h
|
||||
jmp .l1
|
||||
.l2
|
||||
pop di
|
||||
pop bx
|
||||
pop ax
|
||||
ret
|
||||
|
||||
|
||||
|
||||
loadmsg db "Starting ReactOS...",0xd,0xa,0
|
||||
boot_dir_name db 'BOOT'
|
||||
errormsg db "Files missing on boot disk",0
|
||||
errormsg1 db "Disk read error",0
|
||||
msg1 db "Found boot directory",0xd,0xa,0
|
||||
msg2 db 'FAT12',0
|
||||
msg3 db 'FAT16',0
|
||||
|
|
@ -1,12 +0,0 @@
|
|||
Mem layout for osldr
|
||||
|
||||
0000 - 07C0 = BIOS data and stack
|
||||
07C0 - 1000 = Boot sector
|
||||
1000 - 1400 = Tempory storage for fat chains
|
||||
1400 - 2000 = Tempory storage for directory entries
|
||||
2000 - 3000 = OSLDR
|
||||
3000 - 5000 = FAT
|
||||
5000 - a000 = Kernel and modules load area
|
||||
|
||||
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue