07070100000000000081B400000000000000000000000163863434000005F7000000000000000000000000000000000000002700000000uefi_mbr-0+git20221129.53aad69/LICENSEBSD 3-Clause License Copyright (c) 2022, Steffen Winterfeldt All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 07070100000001000081B400000000000000000000000163863434000000A6000000000000000000000000000000000000002800000000uefi_mbr-0+git20221129.53aad69/Makefileall: uefi_mbr.bin uefi_mbr.bin: uefi_mbr.asm nasm -O99 -f bin -l $@.lst -o $@ $< test: all ./test_setup test.img clean: rm -f *.bin *.lst *.o *.img *~ uefi_mbr 07070100000002000081B400000000000000000000000163863434000000D6000000000000000000000000000000000000002900000000uefi_mbr-0+git20221129.53aad69/README.mdMBR loader that just prints a message. To be used on disks intended for UEFI bootable systems to print a warning when legacy-booted accidentally. Here is what it looks like in qemu: ![screenshot](screenshot.jpg)07070100000003000081B400000000000000000000000163863434000047C0000000000000000000000000000000000000002E00000000uefi_mbr-0+git20221129.53aad69/screenshot.jpgJFIFC  !"$"$ X A!"1A2#$%34&5FQaeBd'CESVb?ﶭa m).4O}’F'K6[G7bPz;Y-}eL 鵈ֹ:$j.UWePKW"%IQ`lߡȲHTEXԋ\%EiWGY&i+f.zQW/Le)zn߻oY6..l߳v~9ۍ"}њVYXeO:KpmDU$̊LbTrȨ܊ڴW7KM%$U= Ja؝.DUl{U݋C*.w{%Un稦X|jPO"1Z5p=W*e{Uoߧ7oGuu_WP%#6=gD=Eʵ*])WGs춭(!#cUskS~*QqueGpm=*,R9 ˅_r7r*fz;m-{]VکNwV$xގU":.>hѺjhK}7 ;X."r5U*+}3MU,W+US61>T}E s;7֢&Ek; _i5jvZջE3z$ljbmjrcV?j.<]e}]BS,>tk\I@5*Hv2qMhиu mvPTY3,< &r9TL'*Z/XRKUU/A Ie+XƢe\""*bX} vȫdw"~,qVO%TUL.-.B*/(**>tlk/U|"RGV[,W[ql":%Q"Z#QEU2w[kW;:^w{>6n2j)iҗ $ncQ2UVUT~wzsgφͿoUJcܾV=L6Jˢ.7A-7Ob+fQ9"tHG$lD܍o VUiKBŒYdJ1W*pOW[|M]WڷhwDVvMNLa\EǞlJeGTΛXk3HZ~.UR4%7h_4zr4Ϛ4~ErH֮ D]=7Y}U[gX|odLGaMy/}+U74I®t*ďʿ$OD֋K PWhouKe2aW+3D"xj~rӬu鞛kkV^ԨR2VFŽbe]jpL"gKVn֊Wc|õrX'+[#UQ_2;RrU>So1GP73|mj"nTVZ[+d0$s#ZLVE_C;RrU>So1GP73|mj"nTVZueGpm=*,R9 ˅_r7rMA~mtg^N83;'AU)5{_,/DTXs #nLoGuu_WP%#6=gD=Eʵ*]wgyF땪[./40c4Tk_m5tw;-^jݢ=65Y1691r|mTykVek(\gʍq=sjs|gd}*^M$J$V#^.*e"[L? 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WkA?ǩw6c;7g`07070100000004000081FD00000000000000000000000163863434000000F6000000000000000000000000000000000000002A00000000uefi_mbr-0+git20221129.53aad69/test_setup#! /bin/bash file=$1 disk_size=8G dd if=/dev/zero of="$file" bs="$disk_size" count=0 seek=1 status=none parted --script "$file" mklabel gpt parted --script "$file" mkpart foo fat32 0% 10% dd if=uefi_mbr.bin of="$file" conv=notrunc status=none 07070100000005000081B4000000000000000000000001638634340000028F000000000000000000000000000000000000002C00000000uefi_mbr-0+git20221129.53aad69/uefi_mbr.asm; ; Copyright 2022 Steffen Winterfeldt ; ; See LICENSE for details. ; bits 16 section .text org 7c00h jmp 0:main_10 main_10: mov ax,cs mov ss,ax xor sp,sp mov ds,ax mov es,ax cld sti mov si,msg final_msg: call print mov si,msg_next call print mov ah,0 int 16h mov si,msg_nl call print int 18h final_msg_10: hlt jmp final_msg_10 print: lodsb or al,al jz print_90 mov bx,7 mov ah,14 int 10h jmp print print_90: ret msg_next db 10, "Press a key to continue boot sequence.", 0 msg db 10, "This disk is only UEFI bootable." msg_nl db 13, 10, 0 07070100000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000B00000000TRAILER!!!44 blocks