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Diffstat (limited to 'contrib/syslinux-4.02/core/diskfs.inc')
| -rw-r--r-- | contrib/syslinux-4.02/core/diskfs.inc | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/core/diskfs.inc b/contrib/syslinux-4.02/core/diskfs.inc new file mode 100644 index 0000000..9f18c76 --- /dev/null +++ b/contrib/syslinux-4.02/core/diskfs.inc @@ -0,0 +1,173 @@ +; -*- fundamental -*- (asm-mode sucks) +; ----------------------------------------------------------------------- +; +; Copyright 1994-2009 H. Peter Anvin - All Rights Reserved +; Copyright 2009 Intel Corporation; author: H. Peter Anvin +; +; This program 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, Inc., 51 Franklin St, Fifth Floor, +; Boston MA 02110-1301, USA; either version 2 of the License, or +; (at your option) any later version; incorporated herein by reference. +; +; ----------------------------------------------------------------------- + +; +; diskfs.inc +; +; Common code for conventional disk-based filesystems +; + +; +; Some semi-configurable constants... change on your own risk. +; +NULLFILE equ 0 ; Null character == empty filename +NULLOFFSET equ 0 ; Position in which to look +retry_count equ 16 ; How patient are we with the disk? +%assign HIGHMEM_SLOP 0 ; Avoid this much memory near the top +LDLINUX_MAGIC equ 0x3eb202fe ; A random number to identify ourselves with + +SECTOR_SHIFT equ 9 +SECTOR_SIZE equ (1 << SECTOR_SHIFT) + +; +; The following structure is used for "virtual kernels"; i.e. LILO-style +; option labels. The options we permit here are `kernel' and `append +; Since there is no room in the bottom 64K for all of these, we +; stick them in high memory and copy them down before we need them. +; + struc vkernel +vk_vname: resb FILENAME_MAX ; Virtual name **MUST BE FIRST!** +vk_rname: resb FILENAME_MAX ; Real name +vk_appendlen: resw 1 +vk_type: resb 1 ; Type of file + alignb 4 +vk_append: resb max_cmd_len+1 ; Command line + alignb 4 +vk_end: equ $ ; Should be <= vk_size + endstruc + + + +; --------------------------------------------------------------------------- +; BEGIN CODE +; --------------------------------------------------------------------------- + +; +; Memory below this point is reserved for the BIOS and the MBR +; + section .earlybss + global trackbuf +trackbufsize equ 8192 +trackbuf resb trackbufsize ; Track buffer goes here + ; ends at 2800h + +; +; Common bootstrap code for disk-based derivatives +; +%include "diskstart.inc" + + +; +; Now, everything is "up and running"... patch kaboom for more +; verbosity and using the full screen system +; + ; E9 = JMP NEAR + mov di,kaboom.patch + mov al,0e9h + stosb + mov ax,kaboom2-2 + sub ax,di + stosw + +; +; Now we're all set to start with our *real* business. First load the +; configuration file (if any) and parse it. +; +; In previous versions I avoided using 32-bit registers because of a +; rumour some BIOSes clobbered the upper half of 32-bit registers at +; random. I figure, though, that if there are any of those still left +; they probably won't be trying to install Linux on them... +; +; The code is still ripe with 16-bitisms, though. Not worth the hassle +; to take'm out. In fact, we may want to put them back if we're going +; to boot ELKS at some point. +; + +; +; Load configuration file +; + pm_call load_config + jz no_config_file + +; +; Now we have the config file open. Parse the config file and +; run the user interface. +; +%include "ui.inc" + +; +; +; kaboom2: once everything is loaded, replace the part of kaboom +; starting with "kaboom.patch" with this part + +kaboom2: + mov si,err_bootfailed + call writestr + cmp byte [kaboom.again+1],18h ; INT 18h version? + je .int18 + call getchar + call vgaclearmode + int 19h ; And try once more to boot... +.norge: jmp short .norge ; If int 19h returned; this is the end +.int18: + call vgaclearmode + int 18h +.noreg: jmp short .noreg ; Nynorsk + +; ----------------------------------------------------------------------------- +; Common modules +; ----------------------------------------------------------------------------- + +%include "common.inc" ; Universal modules +%include "plaincon.inc" ; writechr +%include "writestr.inc" ; String output +%include "writehex.inc" ; Hexadecimal output +%include "localboot.inc" ; Disk-based local boot + +; ----------------------------------------------------------------------------- +; Begin data section +; ----------------------------------------------------------------------------- + + section .data16 +copyright_str db ' Copyright (C) 1994-' + asciidec YEAR + db ' H. Peter Anvin et al', CR, LF, 0 +err_bootfailed db CR, LF, 'Boot failed: please change disks and press ' + db 'a key to continue.', CR, LF, 0 + +; +; Config file keyword table +; +%include "keywords.inc" + +; +; Extensions to search for (in *forward* order). +; + alignz 4 +exten_table: db '.cbt' ; COMBOOT (specific) +%if IS_SYSLINUX + db '.bss' ; Boot sector (add superblock) +%endif + db '.bs', 0 ; Boot sector + db '.com' ; COMBOOT (same as DOS) + db '.c32' ; COM32 +exten_table_end: + dd 0, 0 ; Need 8 null bytes here + +; +; Misc initialized (data) variables +; +%ifdef debug ; This code for debugging only +debug_magic dw 0D00Dh ; Debug code sentinel +%endif |