; from MS-LOSS, and can be especially useful in conjunction with the
; umsdos filesystem.
;
-; Copyright (C) 1994-2007 H. Peter Anvin
+; Copyright 1994-2008 H. Peter Anvin - All Rights Reserved
;
; 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 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 at vk_seg:0000 and copy them down before we need them.
+; 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
;
; 0000h - main code/data segment (and BIOS segment)
;
-real_mode_seg equ 4000h
-cache_seg equ 3000h ; 64K area for metadata cache
-vk_seg equ 2000h ; Virtual kernels
+real_mode_seg equ 3000h
+cache_seg equ 2000h ; 64K area for metadata cache
xfer_buf_seg equ 1000h ; Bounce buffer for I/O to high mem
comboot_seg equ real_mode_seg ; COMBOOT image loading zone
section .earlybss
trackbufsize equ 8192
trackbuf resb trackbufsize ; Track buffer goes here
-getcbuf resb trackbufsize
- ; ends at 4800h
+ ; ends at 2800h
section .bss
alignb 8
DataArea resd 1 ; Location of data area
RootDirSize resd 1 ; Root dir size in sectors
TotalSectors resd 1 ; Total number of sectors
-EndSector resd 1 ; Location of filesystem end
ClustSize resd 1 ; Bytes/cluster
ClustMask resd 1 ; Sectors/cluster - 1
CopySuper resb 1 ; Distinguish .bs versus .bss
alignb open_file_t_size
Files resb MAX_OPEN*open_file_t_size
-;
-; Constants for the xfer_buf_seg
-;
-; The xfer_buf_seg is also used to store message file buffers. We
-; need two trackbuffers (text and graphics), plus a work buffer
-; for the graphics decompressor.
-;
-xbs_textbuf equ 0 ; Also hard-coded, do not change
-xbs_vgabuf equ trackbufsize
-xbs_vgatmpbuf equ 2*trackbufsize
-
-
section .text
;
; Some of the things that have to be saved very early are saved
StackBuf equ $-44-32 ; Start the stack here (grow down - 4K)
PartInfo equ StackBuf ; Saved partition table entry
FloppyTable equ PartInfo+16 ; Floppy info table (must follow PartInfo)
-OrigFDCTabPtr equ StackBuf-4 ; The high dword on the stack
+OrigFDCTabPtr equ StackBuf-8 ; The 2nd high dword on the stack
+OrigESDI equ StackBuf-4 ; The high dword on the stack
;
; Primary entry point. Tempting as though it may be, we can't put the
xor ax,ax
mov ss,ax
mov sp,StackBuf ; Just below BSS
+ push es ; Save initial ES:DI -> $PnP pointer
+ push di
mov es,ax
;
; DS:SI may contain a partition table entry. Preserve it for us.
;
mov cx,8 ; Save partition info
- mov di,sp
+ mov di,PartInfo
rep movsw
mov ds,ax ; Now we can initialize DS...
popad
lea sp,[si+16] ; Remove DAPA
jc .error
- pop bp
+ pop bp
add eax,edi ; Advance sector pointer
sub bp,di ; Sectors left
shl di,SECTOR_SHIFT ; 512-byte sectors
- add bx,di ; Advance buffer pointer
+ add bx,di ; Advance buffer pointer
and bp,bp
jnz .loop
kaboom:
xor si,si
mov ss,si
- mov sp,StackBuf-4 ; Reset stack
+ mov sp,StackBuf-4 ; Reset stack
mov ds,si ; Reset data segment
pop dword [fdctab] ; Restore FDC table
.patch: ; When we have full code, intercept here
jmp short .loop
.done:
cbw ; AH <- 0
- int 16h ; Wait for keypress
+.again: int 16h ; Wait for keypress
+ ; NB: replaced by int 18h if
+ ; chosen at install time..
int 19h ; And try once more to boot...
.norge: jmp short .norge ; If int 19h returned; this is the end
FirstSector dd 0xDEADBEEF ; Location of sector 1
MaxTransfer dw 0x007F ; Max transfer size
-bootsignature dw 0AA55h
+
+; This field will be filled in 0xAA55 by the installer, but we abuse it
+; to house a pointer to the INT 16h instruction at
+; kaboom.again, which gets patched to INT 18h in RAID mode.
+bootsignature dw kaboom.again-bootsec
;
; ===========================================================================
.have_secs:
mov [TotalSectors],edx
- add edx,eax
- mov [EndSector],edx
-
mov eax,[bxResSectors]
mov [FAT],eax ; Beginning of FAT
mov edx,[bxFATsecs]
bsr cx,ax
mov [ClustShift],cl
push cx
- add cl,9
+ add cl,SECTOR_SHIFT
mov [ClustByteShift],cl
pop cx
dec ax
mov [ClustMask],eax
inc ax
- shl eax,9
+ shl eax,SECTOR_SHIFT
mov [ClustSize],eax
;
; FAT12, FAT16 or FAT28^H^H32? This computation is fscking ridiculous.
;
getfattype:
- mov eax,[EndSector]
+ mov eax,[TotalSectors]
sub eax,[DataArea]
shr eax,cl ; cl == ClustShift
mov cl,nextcluster_fat12-(nextcluster+2)
%include "init.inc"
;
-; Clear Files structures
-;
- mov di,Files
- mov cx,(MAX_OPEN*open_file_t_size)/4
- xor eax,eax
- rep stosd
-
-;
; Initialize the metadata cache
;
call initcache
;
; Load configuration file
;
+ mov si,config_name ; Save configuration file name
+ mov di,ConfigName
+ call strcpy
+
mov di,syslinux_cfg1
call open
jnz .config_open
%include "ui.inc"
;
-; Linux kernel loading code is common.
-;
-%include "runkernel.inc"
-
-;
-; COMBOOT-loading code
-;
-%include "comboot.inc"
-%include "com32.inc"
-%include "cmdline.inc"
-
-;
-; Boot sector loading code
-;
-%include "bootsect.inc"
-
-;
-; Abort loading code
-;
-%include "abort.inc"
-
-;
; allocate_file: Allocate a file structure
;
; If successful:
ret
;
+; close_file:
+; Deallocates a file structure (pointer in SI)
+; Assumes CS == DS.
+;
+close_file:
+ and si,si
+ jz .closed
+ mov dword [si],0 ; First dword == file_left
+.closed: ret
+
+;
; searchdir:
;
; Open a file
kaboom2:
mov si,err_bootfailed
call cwritestr
+ 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
;
; mangle_name: Mangle a filename pointed to by DS:SI into a buffer pointed
; to by ES:DI; ends on encountering any whitespace.
+; DI is preserved.
;
; This verifies that a filename is < FILENAME_MAX characters,
; doesn't contain whitespace, zero-pads the output buffer,
-; and removes trailing dots and redundant slashes, plus changes
+; and removes trailing dots and redundant slashes, plus changes
; backslashes to forward slashes,
; so "repe cmpsb" can do a compare, and the path-searching routine
; gets a bit of an easier job.
;
;
mangle_name:
+ push di
push bx
xor ax,ax
mov cx,FILENAME_MAX-1
xor ax,ax ; Zero-fill name
rep stosb
pop bx
+ pop di
ret ; Done
;
;
; nextsector: Given a sector in EAX on input, return the next sector
-; of the same filesystem object, which may be the root
-; directory or a cluster chain. Returns EOF.
+; of the same filesystem object, which may be the root
+; directory or a cluster chain. Returns EOF.
;
-; Assumes CS == DS.
+; Assumes CS == DS.
;
nextsector:
push edi
%include "conio.inc" ; Console I/O
%include "plaincon.inc" ; writechr
%include "writestr.inc" ; String output
+%include "configinit.inc" ; Initialize configuration
%include "parseconfig.inc" ; High-level config file handling
%include "parsecmd.inc" ; Low-level config file handling
%include "bcopy32.inc" ; 32-bit bcopy
%include "highmem.inc" ; High memory sizing
%include "strcpy.inc" ; strcpy()
%include "cache.inc" ; Metadata disk cache
+%include "adv.inc" ; Auxillary Data Vector
; -----------------------------------------------------------------------------
; Begin data section
section .data
copyright_str db ' Copyright (C) 1994-', year, ' H. Peter Anvin'
db CR, LF, 0
-boot_prompt db 'boot: ', 0
-wipe_char db BS, ' ', BS, 0
-err_notfound db 'Could not find kernel image: ',0
-err_notkernel db CR, LF, 'Invalid or corrupt kernel image.', CR, LF, 0
-err_noram db 'It appears your computer has less than '
- asciidec dosram_k
- db 'K of low ("DOS")'
- db CR, LF
- db 'RAM. Linux needs at least this amount to boot. If you get'
- db CR, LF
- db 'this message in error, hold down the Ctrl key while'
- db CR, LF
- db 'booting, and I will take your word for it.', CR, LF, 0
-err_badcfg db 'Unknown keyword in syslinux.cfg.', CR, LF, 0
-err_noparm db 'Missing parameter in syslinux.cfg.', CR, LF, 0
-err_noinitrd db CR, LF, 'Could not find ramdisk image: ', 0
-err_nohighmem db 'Not enough memory to load specified kernel.', CR, LF, 0
-err_highload db CR, LF, 'Kernel transfer failure.', CR, LF, 0
-err_oldkernel db 'Cannot load a ramdisk with an old kernel image.'
- db CR, LF, 0
-err_notdos db ': attempted DOS system call', CR, LF, 0
-err_comlarge db 'COMBOOT image too large.', CR, LF, 0
-err_a20 db CR, LF, 'A20 gate not responding!', CR, LF, 0
err_bootfailed db CR, LF, 'Boot failed: please change disks and press '
db 'a key to continue.', CR, LF, 0
-ready_msg db 'Ready.', CR, LF, 0
-crlfloading_msg db CR, LF
-loading_msg db 'Loading ', 0
-dotdot_msg db '.'
-dot_msg db '.', 0
-aborted_msg db ' aborted.' ; Fall through to crlf_msg!
-crlf_msg db CR, LF
-null_msg db 0
-crff_msg db CR, FF, 0
syslinux_cfg1 db '/boot' ; /boot/syslinux/syslinux.cfg
syslinux_cfg2 db '/syslinux' ; /syslinux/syslinux.cfg
syslinux_cfg3 db '/' ; /syslinux.cfg
-ConfigName db 'syslinux.cfg', 0 ; syslinux.cfg
+config_name db 'syslinux.cfg', 0 ; syslinux.cfg
;
; Command line options we'd like to take a look at
;
; Extensions to search for (in *forward* order).
;
-exten_table: db 'CBT',0 ; COMBOOT (specific)
- db 'BSS',0 ; Boot Sector (add superblock)
- db 'BS ',0 ; Boot Sector
- db 'COM',0 ; COMBOOT (same as DOS)
- db 'C32',0 ; COM32
+exten_table: db '.cbt' ; COMBOOT (specific)
+ db '.bss' ; Boot Sector (add superblock)
+ 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
alignb 4, db 0
BufSafe dw trackbufsize/SECTOR_SIZE ; Clusters we can load into trackbuf
-BufSafeSec dw trackbufsize/SECTOR_SIZE ; = how many sectors?
BufSafeBytes dw trackbufsize ; = how many bytes?
-EndOfGetCBuf dw getcbuf+trackbufsize ; = getcbuf+BufSafeBytes
%ifndef DEPEND
%if ( trackbufsize % SECTOR_SIZE ) != 0
%error trackbufsize must be a multiple of SECTOR_SIZE
projects / profile / ivi / syslinux.git / blobdiff