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Added the original copyright from isolinux.
Added 'Press any key to boot from CD' feature. Changed load path to '\REACTOS\FREELDR.SYS'. svn path=/trunk/; revision=2868
This commit is contained in:
Eric Kohl
parent
a9450f5a72
commit
7111fc6bfa
1 changed files with 96 additions and 28 deletions
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@ -1,13 +1,37 @@
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; ****************************************************************************
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;
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; isolinux.asm
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;
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; A program to boot Linux kernels off a CD-ROM using the El Torito
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; boot standard in "no emulation" mode, making the entire filesystem
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; available. It is based on the SYSLINUX boot loader for MS-DOS
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; floppies.
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;
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; Copyright (C) 1994-2001 H. Peter Anvin
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;
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; This program is free software; you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
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; USA; either version 2 of the License, or (at your option) any later
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; version; incorporated herein by reference.
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;
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; ****************************************************************************
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;
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; THIS FILE IS A MODIFIED VERSION OF ISOLINUX.ASM
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; MODIFICATION DONE BY MICHAEL K TER LOUW
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; LAST UPDATED 3-9-2002
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; SEE "COPYING" FOR INFORMATION ABOUT THE LICENSE THAT APPLIES TO THIS RELEASE
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;
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; ****************************************************************************
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;
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; This file is a modified version of ISOLINUX.ASM.
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; Modification done by Eric Kohl
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; Last update 04-25-2002
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;
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; ****************************************************************************
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; Note: The Makefile builds one version with DEBUG_MESSAGES automatically.
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%define DEBUG_MESSAGES ; Uncomment to get debugging messages
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;%define DEBUG_MESSAGES ; Uncomment to get debugging messages
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@ -61,6 +85,7 @@ LF equ 10 ; Line Feed
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DriveNo resb 1 ; CD-ROM BIOS drive number
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DiskError resb 1 ; Error code for disk I/O
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RetryCount resb 1 ; Used for disk access retries
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TimeoutCount resb 1 ; Timeout counter
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ISOFlags resb 1 ; Flags for ISO directory search
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RootDir resb dir_t_size ; Root directory
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CurDir resb dir_t_size ; Current directory
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@ -96,14 +121,67 @@ start:
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relocate:
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; Display the banner and copyright
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%ifdef DEBUG_MESSAGES
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mov si, isolinux_banner ; si points to hello message
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call writestr ; display the message
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%ifdef DEBUG_MESSAGES
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mov si,copyright_str
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call writestr
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%endif
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; Make sure the keyboard buffer is empty
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.kbd_buffer_test:
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call pollchar
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jz .kbd_buffer_empty
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call getchar
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jmp .kbd_buffer_test
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.kbd_buffer_empty:
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; Display the 'Press key' message and wait for a maximum of 5 seconds
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call crlf
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mov si, presskey_msg ; si points to 'Press key' message
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call writestr ; display the message
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mov byte [TimeoutCount], 5
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.next_second:
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mov eax, [BIOS_timer] ; load current tick counter
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add eax, 19 ;
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.poll_again:
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call pollchar
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jnz .boot_cdrom
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mov ebx, [BIOS_timer]
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cmp eax, ebx
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jnz .poll_again
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mov si, dot_msg ; print '.'
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call writestr
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dec byte [TimeoutCount] ; decrement timeout counter
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jz .boot_harddisk
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jmp .next_second
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.boot_harddisk:
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; Boot first harddisk (drive 0x80)
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mov ax, 0201h
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mov dx, 0080h
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mov cx, 0001h
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mov bx, 7C00h
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int 13h
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jnc .go_hd
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jmp kaboom
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.go_hd:
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mov ax, cs
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov dx, 0080h
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jmp 0:0x7C00
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.boot_cdrom:
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; Save and display the boot drive number
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mov [DriveNo], dl
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%ifdef DEBUG_MESSAGES
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@ -256,7 +334,6 @@ get_fs_structures:
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;
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; searchdir:
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;
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@ -776,11 +853,22 @@ getchar:
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ret
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;
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; pollchar: check if we have an input character pending (ZF = 0)
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;
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pollchar:
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pushad
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mov ah,1 ; Poll keyboard
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int 16h
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popad
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ret
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isolinux_banner db CR, LF, 'Loading IsoBoot...', CR, LF, 0
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copyright_str db ' Copyright (C) 1994-2002 H. Peter Anvin', CR, LF, 0
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presskey_msg db 'Press any key to boot from CD', 0
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dot_msg db '.',0
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%ifdef DEBUG_MESSAGES
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startup_msg: db 'Starting up, DL = ', 0
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@ -795,7 +883,6 @@ filesect_msg: db 'FreeLdr.sys length(sectors): ', 0
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findfail_msg: db 'Failed to find file!', 0
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%endif
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nosecsize_msg: db 'Failed to get sector size, assuming 0800', CR, LF, 0
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spec_err_msg: db 'Loading spec packet failed, trying to wing it...', CR, LF, 0
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maybe_msg: db 'Found something at drive = ', 0
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@ -806,13 +893,9 @@ crlf_msg db CR, LF, 0
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diskerr_msg: db 'Disk error ', 0
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ondrive_str: db ', drive ', 0
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err_bootfailed db CR, LF, 'Boot failed: press a key to retry...'
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;isolinux_dir db '\bscript', 0
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isolinux_dir db '\I386', 0
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;no_dir_msg db 'Could not find the \bscript directory.', CR, LF, 0
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no_dir_msg db 'Could not find the I386 directory.', CR, LF, 0
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;isolinux_bin db 'isolinux.bin', 0
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isolinux_dir db '\REACTOS', 0
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no_dir_msg db 'Could not find the REACTOS directory.', CR, LF, 0
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isolinux_bin db 'FREELDR.SYS', 0
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;no_isolinux_msg db 'Could not find the file isolinux.bin.', CR, LF, 0
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no_isolinux_msg db 'Could not find the file FREELDR.SYS.', CR, LF, 0
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;
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@ -868,21 +951,6 @@ dapa: dw 16 ; Packet size
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times 2048-($-$$) nop ; Pad to file offset 2048
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;section .bss
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;DriveNo resb 1 ; CD-ROM BIOS drive number
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;DiskError resb 1 ; Error code for disk I/O
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;RetryCount resb 1 ; Used for disk access retries
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;ISOFlags resb 1 ; Flags for ISO directory search
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;RootDir resb dir_t_size ; Root directory
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;CurDir resb dir_t_size ; Current directory
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;ISOFileName resb 64 ; ISO filename canonicalization buffer
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;ISOFileNameEnd equ $
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; alignb open_file_t_size
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;Files resb MAX_OPEN*open_file_t_size
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