1 ; -*- fundamental -*- (asm-mode sucks) 2 ; ----------------------------------------------------------------------- 3 ; 4 ; Copyright 1994-2009 H. Peter Anvin - All Rights Reserved 5 ; Copyright 2009-2011 Intel Corporation; author: H. Peter Anvin 6 ; 7 ; This program is free software; you can redistribute it and/or modify 8 ; it under the terms of the GNU General Public License as published by 9 ; the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, 10 ; Boston MA 02110-1301, USA; either version 2 of the License, or 11 ; (at your option) any later version; incorporated herein by reference. 12 ; 13 ; ----------------------------------------------------------------------- 14 15 ; 16 ; diskfs.inc 17 ; 18 ; Common code for conventional disk-based filesystems 19 ; 20 21 ; 22 ; Some semi-configurable constants... change on your own risk. 23 ; 24 NULLFILE equ 0 ; Null character == empty filename 25 NULLOFFSET equ 0 ; Position in which to look 26 retry_count equ 16 ; How patient are we with the disk? 27 %assign HIGHMEM_SLOP 0 ; Avoid this much memory near the top 28 LDLINUX_MAGIC equ 0x3eb202fe ; A random number to identify ourselves with 29 30 ; This indicates the general format of the last few bytes in the boot sector 31 BS_MAGIC_VER equ 0x1b << 9 32 33 MIN_SECTOR_SHIFT equ 9 34 MIN_SECTOR_SIZE equ (1 << MIN_SECTOR_SHIFT) 35 36 ; --------------------------------------------------------------------------- 37 ; BEGIN CODE 38 ; --------------------------------------------------------------------------- 39 40 ; 41 ; Memory below this point is reserved for the BIOS and the MBR 42 ; 43 section .earlybss 44 global trackbuf:data hidden 45 trackbufsize equ 8192 46 trackbuf resb trackbufsize ; Track buffer goes here 47 ; ends at 2800h 48 49 ; 50 ; Common bootstrap code for disk-based derivatives 51 ; 52 %include "diskstart.inc" 53 54 ; 55 ; Now, everything is "up and running"... patch kaboom for more 56 ; verbosity and using the full screen system 57 ; 58 ; E9 = JMP NEAR 59 mov di,kaboom.patch 60 mov al,0e9h 61 stosb 62 mov ax,kaboom2-2 63 sub ax,di 64 stosw 65 66 ; 67 ; If we get to this point ldlinux.c32 failed to run. There's nothing 68 ; left to do but inform that user that something went wrong. 69 ; 70 enter_command: 71 auto_boot: 72 jmp kaboom 73 74 section .bss16 75 alignb 4 76 ThisKbdTo resd 1 ; Temporary holder for KbdTimeout 77 ThisTotalTo resd 1 ; Temporary holder for TotalTimeout 78 KernelExtPtr resw 1 ; During search, final null pointer 79 FuncFlag resb 1 ; Escape sequences received from keyboard 80 KernelType resb 1 ; Kernel type, from vkernel, if known 81 global KernelName 82 KernelName resb FILENAME_MAX ; Mangled name for kernel 83 84 section .text16 85 ; 86 ; COM32 vestigial data structure 87 ; 88 %include "com32.inc" 89 90 ; 91 ; Common local boot code 92 ; 93 %include "localboot.inc" 94 95 ; 96 ; kaboom2: once everything is loaded, replace the part of kaboom 97 ; starting with "kaboom.patch" with this part 98 99 kaboom2: 100 mov si,err_bootfailed 101 pm_call pm_writestr 102 cmp byte [kaboom.again+1],18h ; INT 18h version? 103 je .int18 104 pm_call pm_getchar 105 pm_call syslinux_force_text_mode 106 int 19h ; And try once more to boot... 107 .norge: jmp short .norge ; If int 19h returned; this is the end 108 .int18: 109 pm_call syslinux_force_text_mode 110 int 18h 111 .noreg: jmp short .noreg ; Nynorsk 112 113 ; ----------------------------------------------------------------------------- 114 ; Common modules 115 ; ----------------------------------------------------------------------------- 116 117 %include "common.inc" ; Universal modules 118 119 ; ----------------------------------------------------------------------------- 120 ; Begin data section 121 ; ----------------------------------------------------------------------------- 122 123 section .data16 124 global copyright_str 125 copyright_str db ' Copyright (C) 1994-' 126 asciidec YEAR 127 db ' H. Peter Anvin et al', CR, LF, 0 128 err_bootfailed db CR, LF, 'Boot failed: please change disks and press ' 129 db 'a key to continue.', CR, LF, 0 130 131 ; 132 ; Misc initialized (data) variables 133 ; 134 %ifdef debug ; This code for debugging only 135 debug_magic dw 0D00Dh ; Debug code sentinel 136 %endif 137
