diff options
Diffstat (limited to 'core/extlinux.asm')
| -rw-r--r-- | core/extlinux.asm | 190 |
1 files changed, 1 insertions, 189 deletions
diff --git a/core/extlinux.asm b/core/extlinux.asm index 27fbc3e6..2a5526b8 100644 --- a/core/extlinux.asm +++ b/core/extlinux.asm @@ -23,194 +23,6 @@ ; Some semi-configurable constants... change on your own risk. ; my_id equ extlinux_id -; NASM 0.98.38 croaks if these are equ's rather than macros... FILENAME_MAX_LG2 equ 8 ; log2(Max filename size Including final null) -FILENAME_MAX equ (1 << FILENAME_MAX_LG2) ; Max mangled filename size -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 -MAX_OPEN_LG2 equ 6 ; log2(Max number of open files) -MAX_OPEN equ (1 << MAX_OPEN_LG2) - -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 - - section .bss16 - alignb 16 - global Files -Files resb MAX_OPEN*16 ; 16 == open_file_t_size - -; -; 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" - - -; -; unmangle_name: Does the opposite of mangle_name; converts a DOS-mangled -; filename to the conventional representation. This is needed -; for the BOOT_IMAGE= parameter for the kernel. -; -; DS:SI -> input mangled file name -; ES:DI -> output buffer -; -; On return, DI points to the first byte after the output name, -; which is set to a null byte. -; -unmangle_name: call strcpy - dec di ; Point to final null byte - ret - -; -; -; 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 - - - -build_curdir_str: - ret - -; ----------------------------------------------------------------------------- -; Common modules -; ----------------------------------------------------------------------------- - -%include "common.inc" ; Universal modules -%include "plaincon.inc" ; writechr -%include "writestr.inc" ; String output -%include "writehex.inc" ; Hexadecimal output -%include "strecpy.inc" ; strcpy with end pointer check -%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_name db 'extlinux.conf',0 ; Unmangled form - -; -; Config file keyword table -; -%include "keywords.inc" - -; -; Extensions to search for (in *forward* order). -; - alignz 4 -exten_table: db '.cbt' ; COMBOOT (specific) - db '.img' ; Disk image - 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 - - alignz 4 -BufSafe dw trackbufsize/SECTOR_SIZE ; Clusters we can load into trackbuf -BufSafeBytes dw trackbufsize ; = how many bytes? -%ifndef DEPEND -%if ( trackbufsize % SECTOR_SIZE ) != 0 -%error trackbufsize must be a multiple of SECTOR_SIZE -%endif -%endif +%include "diskfs.inc" |