search for: lodsb

Found this small bug. It won't print error messages. A simple fix. --- mbr.asm.orig 2002-10-03 06:02:50.000000000 -0400 +++ mbr.asm 2004-01-08 06:55:13.000000000 -0500 @@ -165,7 +165,7 @@ die: .msgloop: lodsb - xor al,al + or al,al jz .now mov ah,0Eh ; TTY output mov bx,0007h -- Pluto 2004-02-02 03:20:54.489 UTC (JD 2453037.639520) X = -5.255192111, Y = -29.339637518, Z = -7.572624207 X...

...5 ; END option je .done + ; + ; ISC-dhcp v 3.X + PXE patch encapsulates pxelinux options into + ; vendor-extension (rfc 1533, option 43) Jaroslaw.Polok at cern.ch + ; for now just skip option byte and length byte + + cmp al, 43 ; VENDOR EXTENSION option + jne .not_vendor_exts + lodsb + dec cx + jmp short .loop + + .not_vendor_exts: + ; Anything else will have a length field mov dl,al ; DL <- option number xor ax,ax lodsb ; AX <- option length dec cx

...call wrchr popw %dx andw $0xFFF0, %dx call wrhexw #endif /* DEBUG_PNP */ call crlf end: jmp bootfail ASCII_MARKER1 "wc" wrchr: movb $0x0e, %ah movb (BIOS_page), %bh movb $0x07, %bl int $0x10 /* May destroy %bp */ ret ASCII_MARKER1 "ws" wrstr: pop %si wrstr_l: lodsb cmpb $0, %al je wrstr_d call wrchr jmp wrstr_l wrstr_d: push %si ret crlf: call wrstr .ascii "\r\n\0" ret ASCII_MARKER1 "hx" wrhexn: and $0x0F, %al cmpb $10, %al jae .alph addb $'0, %al jmp .wc .alph: addb $('A - 10), %al .wc: call wrchr ret wrhexb:...

...+.vfat_abort: ; Something went wrong, skip + pop di + pop si + pop ecx + pop eax + jmp .skip_entry + +.short_entry: + test byte [gs:si+11],8 ; Ignore volume labels //HERE + jnz .skip_entry + mov edx,eax ;Save current sector + push cx + push si + push di + mov cx,8 +.short_file: + gs lodsb + cmp al,'.' + jz .short_dot +.short_file_loop: + cmp al,' ' + jz .short_skip_bs + stosb + loop .short_file_loop + jmp .short_period +.short_skip_bs: ; skip blank spaces in FILENAME (before EXT) + add si,cx + dec si +.short_period: + mov al,'.' + stosb + mov cx,...

...t_cp_ln: ; Copy VFAT line + dec al ; Store the next line we need + mov dx,ax ; Use DX to store the progress + mov bx,13 + mov ah,0 + mul bl ; Offset for DI + add di,ax ; Increment DI + inc si ; Align to the real characters + mov cx,13 ; 13 characters per VFAT DIRENT +.vfat_cp_chr: + gs lodsb + inc si ; Unicode here!! + stosb + cmp al,0 + jz .vfat_find_next ; Null-terminated string; don't process more + cmp cx,3 + je .vfat_adj_add2 + cmp cx,9 + jne .vfat_adj_add0 +.vfat_adj_add3: inc si +.vfat_adj_add2: inc si +.vfat_adj_add1: inc si +.vfat_adj_add0: + loop .vfat_cp_chr +...

...uf + push ebx + call parseint + jc .err + mov [menu_timeout],ebx +.err: + pop ebx +.eof: +.noparm: + ret + skipline: cmp al,10 je .end @@ -897,6 +932,35 @@ memcmp: pop si ret +parseint: + push eax + push ecx + xor eax,eax + xor ebx,ebx + xor ecx,ecx + mov cl,10 +.loop: + lodsb + and al,al + jz .done + cmp al,'0' + jb .err + cmp al,'9' + ja .err + sub al,'0' + imul ebx,ecx + add ebx,eax + jmp short .loop +.done: + clc +.ret: + pop ecx + pop eax + ret +.err: + stc + jmp short .ret + section .data msg_progname db 'gfxboot: ...

Sensei H. Peter Anvin, I have successfully modified/enhanced memdisk so that one can chainload a local operating system after running diskless FreeDOS. I would like your advice regarding the appropriate interface for invoking this functionality. In addition, I would like to know what steps to take so that you feel comfortable considering including this in the standard syslinux distribution.

...his is invoked with "call", with the - * error message at the return address. +/* + * Print message. This is invoked with "call", with the message at the + * return address. + * Destroys SI. */ -error: - popw %si +print_string: + pop %si + push %bp + push %ax + push %bx 2: lodsb movb $0x0e, %ah @@ -284,10 +329,11 @@ error: cmpb $10, %al /* Newline? */ jne 2b - int $0x18 /* Boot failure */ -die: - hlt - jmp die - + pop %bx + pop %ax + pop %bp + push %si + ret + /* Address of pointer to isolinux.bin */ lba_offset = _start+432 diff --git a/mbr/isohdppv.S b/mbr/is...

I'm running Fedora core 3 and compiled wine 0.9.18 from source. WIth version 0.9.16 I was able to run OziExplorer just fine, but it aborts with this version. Has anyone else encountered problems? wine OziExp.exe wine: Unhandled page fault on read access to 0x7bc80006 at address 0xe8684a (thread 0009), starting debugger... WineDbg starting on pid 0x8 Unhandled exception: page fault on

...call mangle_name ; Mangle ramdisk name pop si cmp byte [es:InitRD],NULLFILE ; Null filename? seta byte [es:initrd_flag] ; Set flag if not not_initrd: pop es ; Restore ES -> real_mode_seg skip_this_opt: lodsb ; Load from command line cmp al,' ' ja skip_this_opt @@ -287,20 +299,28 @@ call cwritestr ; ; Now see if we have an initial RAMdisk; if so, do requisite computation ; We know we have a new kernel; the old_kern...

...call mangle_name ; Mangle ramdisk name pop si cmp byte [es:InitRD],NULLFILE ; Null filename? seta byte [es:initrd_flag] ; Set flag if not not_initrd: pop es ; Restore ES -> real_mode_seg skip_this_opt: lodsb ; Load from command line cmp al,' ' ja skip_this_opt @@ -287,20 +299,28 @@ call cwritestr ; ; Now see if we have an initial RAMdisk; if so, do requisite computation ; We know we have a new kernel; the old_kern...

...line write pointer push di mov byte [di],0 ; Null-terminate command line mov si,command_line call cwritestr ; Write command line so far pop di jmp short get_char_2 auto_boot: mov si,default_cmd mov di,command_line @@ -3377,21 +3435,24 @@ pushad .top: lodsb and al,al jz .end call writechr jmp short .top .end: popad popfd ret -%ifdef debug +; BEGIN DTM ------------------------------------------------ +;%ifdef debug +%ifdef debug or writehex +; END DTM --------------------------------------...

...ters whose address is in SI */ +print: + cld /* move left-to-right in string */ + movb (video_page), %bh /* get current page from video controller's memory-mapped I/O register */ + movb $0x07, %bl /* colour attribute */ + movb $0x0e, %ah /* BIOS function: display char */ + +print_next: + lodsb /* load a character into AL */ + orb %al, %al /* is it the string zero terminator? */ + jz print_end /* finished */ + + call print_char + jmp print_next /* next character */ + +print_char: + int $0x10 /* display */ + ret + +print_end: + ret + +msg_boot: + .ascii "DIAG " +msg_...

...$0x0F, %al cmp $9, %al jbe .wc add $('A'-'0'-10), %al .wc: add $'0', %al call wrchr ret /* * Print message. This is invoked with "call", with the message at the * return address. * Destroys SI. */ print_string: pop %si push %bp push %ax push %bx 2: lodsb call wrchr cmpb $10, %al /* Newline? */ jne 2b pop %bx pop %ax pop %bp push %si ret end_of_code: /* Address of pointer to isolinux.bin */ lba_offset = _start+432

...ters whose address is in SI */ +print: + cld /* move left-to-right in string */ + movb (video_page), %bh /* get current page from video controller's memory-mapped I/O register */ + movb $0x07, %bl /* colour attribute */ + movb $0x0e, %ah /* BIOS function: display char */ + +print_next: + lodsb /* load a character into AL */ + orb %al, %al /* is it the string zero terminator? */ + jz print_end /* finished */ + + call print_char + jmp print_next /* next character */ + +print_char: + int $0x10 /* display */ + ret + +print_end: + ret + +msg_boot: + .ascii "DIAG " +msg_...

...mov ds, ax call PrintHelloWorld jmp .InfiniteLoop .InfiniteLoop: jmp .InfiniteLoop HelloWorld db "Hello World Bootloader !!", 0x0d, 0x0a, 0x00 PrintHelloWorld: mov si, HelloWorld call PrintStr ret PrintStr: push ax mov ah, 0Eh .loop: lodsb cmp al, 0x00 je .done int 10h jmp .loop .done: pop ax ret times 510-($-$$) db 0 dw 0xAA55 ' > hello.asm nasm -f bin -o hello.bin hello.asm dd status=noxfer conv=notrunc if=hello.bin of=hello.img kvm hello.img On Sun, Jan 19, 2014 at 5:2...

...ters whose address is in SI */ +print: + cld /* move left-to-right in string */ + movb (video_page), %bh /* get current page from video controller's memory-mapped I/O register */ + movb $0x07, %bl /* colour attribute */ + movb $0x0e, %ah /* BIOS function: display char */ + +print_next: + lodsb /* load a character into AL */ + orb %al, %al /* is it the string zero terminator? */ + jz print_end /* finished */ + + call print_char + jmp print_next /* next character */ + +print_char: + int $0x10 /* display */ + ret + +print_end: + ret + +msg_boot: +msg_address_mode: + .ascii &quo...

Good day to all, Gert Hulselmans requested a feature for MDISKCHK.COM that would function roughly like GETARGS.COM[1] by Murali Krishnan Ganapathy: DOS SET command output for MEMDISK kernel arguments passed by previous boot-loaders. He also needed to support the case for MEMDISK-in-a-MEMDISK type situations, where all MEMDISK kernel arguments could be gathered together and output as a list

Hi, These patches contain support for some features that are already in Syslinux 4 but weren't working properly on the elflink branch. It's another step closer to feature parity with Syslinux 4. Having to jump through the comboot API for localboot support is less than ideal and I'll eventually fix that, probably when we move a big chunk of code from asm to C. Also, there's a

> > In message <BLU0-SMTP2805E16A0E7A33B925EDF458BB80 at phx.gbl>, > Ady <ady-sf at hotmail.com> wrote: > > >Now, to move forward with Clonezilla in your USB drive, we need to > >proceed with some steps that are not as simple as dd'ing an image. > > Apologies for my impertinence, but I have one question: Why? > > I was under the impression