| [e16e8f2] | 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 |
|---|
