#
SOURCES = ldlinux.asm syslinux.asm syslinux.c copybs.asm \
pxelinux.asm pxe.inc mbr.asm gethostip.c
-BTARGET = bootsect.bin ldlinux.sys ldlinux.bin ldlinux.lst pxelinux.0 mbr.bin
+BTARGET = bootsect.bin ldlinux.sys ldlinux.bin ldlinux.lst \
+ pxelinux.0 mbr.bin isolinux.bin
ITARGET = syslinux.com syslinux copybs.com gethostip
DOCS = COPYING NEWS README TODO *.doc sample
OTHER = Makefile bin2c.pl now.pl genstupid.pl keytab-lilo.pl version \
endif
ldlinux.bin: ldlinux.asm
- $(NASM) -f bin -dVERSION="'$(VERSION)'" -dDATE_STR="'$(DATE)'" -dHEXDATE="$(HEXDATE)" -l ldlinux.lst -o ldlinux.bin ldlinux.asm
+ $(NASM) -f bin -dVERSION="'$(VERSION)'" -dDATE_STR="'$(DATE)'" \
+ -dHEXDATE="$(HEXDATE)" \
+ -l ldlinux.lst -o ldlinux.bin ldlinux.asm
perl genstupid.pl < ldlinux.lst
-pxelinux.0: pxelinux.asm
- $(NASM) -f bin -dVERSION="'$(VERSION)'" -dDATE_STR="'$(DATE)'" -dHEXDATE="$(HEXDATE)" -l pxelinux.lst -o pxelinux.0 pxelinux.asm
+pxelinux.0: pxelinux.asm pxe.inc
+ $(NASM) -f bin -dVERSION="'$(VERSION)'" -dDATE_STR="'$(DATE)'" \
+ -dHEXDATE="$(HEXDATE)" \
+ -l pxelinux.lst -o pxelinux.0 pxelinux.asm
+
+isolinux.bin: isolinux.asm
+ $(NASM) -f bin -dVERSION="'$(VERSION)'" -dDATE_STR="'$(DATE)'" \
+ -dHEXDATE="$(HEXDATE)" \
+ -l isolinux.lst -o isolinux.bin isolinux.asm
bootsect.bin: ldlinux.bin
dd if=ldlinux.bin of=bootsect.bin bs=512 count=1
;
struc open_file_t
file_sector resd 1 ; Sector pointer (0 = structure free)
-file_sectors resd 1 ; Number of sectors left
+file_left resd 1 ; Number of sectors left
endstruc
%if (open_file_t_size & (open_file_t_size-1))
HiLoadAddr resd 1 ; Address pointer for high load loop
HighMemSize resd 1 ; End of memory pointer (bytes)
KernelSize resd 1 ; Size of kernel (bytes)
+RootDir resd 1 ; Root directory location (LBA)
+RootDirLen resd 1 ; Root directory length
SavedSSSP resw 1 ; Our SS:SP while running a COMBOOT image
FBytes equ $ ; Used by open/getc
FBytes1 resw 1
PktTimeout resw 1 ; Timeout for current packet
KernelExtPtr resw 1 ; During search, final null pointer
LocalBootType resw 1 ; Local boot return code
+RootDirClust resw 1 ; Root directory length in clusters
TextAttrBX equ $
TextAttribute resb 1 ; Text attribute for message file
TextPage resb 1 ; Active display page
; Show signs of life
mov si,isolinux_banner
call writestr
+ call crlf ; For now...
; Set up boot file sizes
mov eax,[bi_length]
ret
;
+; Get one sector. Convenience entry point.
+;
+getonesec:
+ mov bp,1
+ ; Fall through to getlinsec
+
+;
; Get linear sectors - EBIOS LBA addressing, 2048-byte sectors.
;
; Note that we can't always do this as a single request, because at least
; Phoenix BIOSes has a 127-sector limit. To be on the safe side, stick
; to 32 sectors (64K) per request.
;
+; Input:
+; EAX - Linear sector number
+; ES:BX - Target buffer
+; BP - Sector count
+;
getlinsec:
mov si,dapa ; Load up the DAPA
mov [si+4],bx
mov word [writechr+1], writechr_full-(writechr+3)
;
+; Now, we need to sniff out the actual filesystem data structures.
+; mkisofs gave us a pointer to the primary volume descriptor
+; (which will be at 16 only for a single-session disk!); from the PVD
+; we should be able to find the rest of what we need to know.
+;
+get_fs_structures:
+ mov eax,[bi_pvd]
+ mov bx,trackbuf
+ call getonesec
+
+ mov eax,[trackbuf+156+2]
+ mov [RootDir],eax
+ mov eax,[trackbuf+156+10]
+ mov [RootDirLen],eax
+ add eax,SECTORSIZE-1
+ shr eax,SECTORSIZE_LG2
+ mov [RootDirClust],ax
+
+;
; Initialize screen (if we're using one)
;
; DS:DI = filename
; If successful:
; ZF clear
-; SI = socket pointer
+; SI = file pointer
; DX:AX = file length in bytes
; If unsuccessful
; ZF set
;
searchdir:
- ; ISOLINUX:: Do stuff
+ push es
+ push ds
+ pop es ; DS = ES
+ call allocate_file ; Temporary file structure for directory
+ jnz .failure
+ mov si,bx
+ movzx eax,word [RootDirClust]
+ mov [bx+file_left],eax
+ mov eax,[RootDir]
+ mov [bx+file_sector],eax
+ mov edx,[RootDirLen]
+ mov si,trackbuf+SECTORSIZE
+
+.getsome:
+ ; Get a chunk of the directory
+ pushad
+ mov si,bx
+ mov bx,trackbuf+SECTORSIZE
+ mov cx,[BufSafe]
+ dec cx ; ... minus one sector
+ call getfssec
+ popad
+
+.compare:
+ test [si+25], byte 8Eh ; Unwanted file attributes!
+ jnz .not_file
+ movzx cx,byte [si+32] ; File identifier length
+ push si
+ lea si,[si+33] ; File identifier offset
+ call iso_compare_names
+ pop si
+ je .success
+.not_file:
+ xor eax,eax
+ mov al,[si]
+ sub edx,eax ; Decrease bytes left
+ jbe .failure
+ add si,ax ; Advance pointer
+
+ ; Are we getting close to the end of the buffer
+ cmp si,trackbuf+trackbufsize-SECTORSIZE
+ jb .compare ; No, keep going
+
+ ; Close to end of buffer. Copy fractional sector to top of
+ ; buffer, and load another chunk.
+ push di
+ lea di,[si-(trackbufsize-SECTORSIZE)]
+ mov cx,trackbuf+trackbufsize
+ sub cx,si
+ push di
+ rep movsb
+ pop si ; SI <- new pointer location
+ pop di
+ jmp short .getsome ; Get another chunk
+
+.failure: xor ax,ax ; ZF = 1
+ pop es
+ ret
+
+.success:
+ mov eax,[si+2] ; Location of extent
+ mov [bx+file_sector],eax
+ mov eax,[si+10] ; Data length
+ push eax
+ add eax,SECTORSIZE-1
+ shr eax,SECTORSIZE_LG2
+ mov [bx+file_left],eax
+ pop eax
+ mov edx,eax
+ shr edx,16
+ and bx,bx ; ZF = 0
+ pop es
+ ret
+
+;
+; allocate_file: Allocate a file structure
+;
+; If successful:
+; ZF set
+; BX = file pointer
+; In unsuccessful:
+; ZF clear
+;
+allocate_file:
+ push cx
+ mov bx,Files
+ mov cx,MAX_OPEN
+.check: cmp dword [bx], byte 0
+ je .found
+ add bx,open_file_t_size
+ loop .check
+ xor cx,cx ; ZF = 1
+.found: pop cx
ret
+;
+; iso_compare_names:
+; Compare the names DS:SI and DS:DI and report if they are
+; equal from an ISO 9660 perspective. SI is the name from
+; the filesystem; CX indicates its length, and ';' terminates.
+; DI is expected to end with a null.
+;
+iso_compare_names:
+ push ax
+.loop: jcxz .si_end
+ lodsb
+ dec cx
+ mov ah,[di]
+ inc di
+ or ax,2020h ; Convert both to lowercase
+ cmp ah,al
+ jne .done ; ZF = 0
+ cmp al,';'
+ je .si_end
+ and al,al
+ jnz .loop
+.si_end:
+ cmp [di], byte 0
+ ; Now ZF is set according to the final result
+.done:
+ pop ax
+ ret
;
; strcpy: Copy DS:SI -> ES:DI up to and including a null byte
ret
;
-; getfssec: Get multiple clusters from a file, given the starting cluster.
-;
-; In this case, get multiple blocks from a specific TCP connection.
+; getfssec: Get multiple clusters from a file, given the file pointer.
;
; On entry:
; ES:BX -> Buffer
; CF = 1 -> Hit EOF
;
getfssec:
- ;; ISOLINUX:: DO STUFF
+ push ds
+ push cs
+ pop ds ; DS <- CS
+
+ cmp cx,[si+file_left]
+ jna .ok_size
+ mov cx,[si+file_left]
+.ok_size:
+
+ mov bp,cx
+ push cx
+ mov eax,[si+file_sector]
+ call getfssec
+ xor ecx,ecx
+ pop cx
+
+ add [si+file_sector],ecx
+ sub [si+file_left],ecx
+ ja .not_eof ; CF = 0
+
+ xor ecx,ecx
+ mov [si+file_sector],ecx ; Mark as unused
+ xor si,si
+ stc
+
+.not_eof:
+ pop ds
ret
+
; ----------------------------------------------------------------------------------
; VGA splash screen code
; ----------------------------------------------------------------------------------
projects / platform / upstream / syslinux.git / commitdiff