mirror of
https://github.com/reactos/reactos.git
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new release cleanup
svn path=/trunk/; revision=13
This commit is contained in:
Rex Jolliff
parent
b5efc5cfc5
commit
cdafa11dc1
|
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@ -1,291 +1,291 @@
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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
|
||||
; as published by the Free Software Foundation; either version
|
||||
; 2, or (at your option) any later version.
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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
|
||||
; 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,
|
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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 1.2 1998/08/12 22:43:38 rosmgr Exp $
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;
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; $Log: boot.asm,v $
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; Revision 1.2 1998/08/12 22:43:38 rosmgr
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; Update from the kernel team
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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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;
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; File:
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; 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/boot.asm,v 1.3 1998/08/25 04:37:43 rex Exp $
|
||||
;
|
||||
; $Log: boot.asm,v $
|
||||
; Revision 1.3 1998/08/25 04:37:43 rex
|
||||
; new 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.
|
||||
;
|
||||
|
||||
section .text
|
||||
|
||||
org 0
|
||||
Entry: jmp real_start
|
||||
|
||||
; bp is initialized to 7c00h
|
||||
%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
|
||||
|
||||
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
|
||||
|
||||
%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]
|
||||
|
||||
;
|
||||
; Include macros for filesystem access
|
||||
;
|
||||
%include "boot.inc"
|
||||
|
||||
;
|
||||
;
|
||||
;
|
||||
TIMES 3eh-($-$$) DB 0
|
||||
|
||||
%define tempbuf [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, 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:
|
||||
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
|
||||
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
|
||||
ret
|
||||
|
||||
errmsg db "Boot error"
|
||||
ERRMSGLEN equ $ - errmsg
|
||||
|
||||
|
||||
;filename db "OSLDR BIN"
|
||||
filename db "KERNEL BIN"
|
||||
|
||||
TIMES 510-($-$$) DB 0
|
||||
sign dw 0aa55h
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue