i always feel these questions are answered to best effort of a person just starting out in the field of os / bare metal programming. there is a whole plethora o

i always feel these questions are answered to best effort of a person just starting out in the field of os / bare metal programming. there is a whole plethora of information missing in this post crucial to x86/64 early development which will get new programmers of this type into trouble if they don't become aware of it. i'd be careful following such advices. for example this person isn't aware you really need to build a cross toolchain for your OS to compile to your target. on 64-bit there's some more things to take into account about compilers (red-zone?). even if you go all assembly your assembler will probably be an optimising one and shoot you in the back on more than one occasion! Thats just the tool-chain surface issues (deeper ones ignored... like file formats..? binary is fun, but good luck scaling that up to a complex project... bios can't load you up that high in memory and limited amounts...) Next you get to things omitted which on baremetal would cause problems, like no mention of power management and such topics. or even assumptions that your code is loaded at 0x0000:0x7c00 while it could be loaded at that address but via a different CS value, completely screwing you over if you don't flush it immediately on your mbr... Take an example of opengl tutorials. people tell you to write your first polygon because they just managed to do so. They forget to mention to throttle the loop, so you burn out your VGA card rendering 10000000000fps of 1 triangle.... good job! this tutorials are kind of like that. fun to put into qemu which is sort of 'safe' learning and get acquainted but really doesn't do what it says on the box. I'm not against these type of tutorials, i like that more people become interested in this, but really take some time and state the scope of the offered information properly. like this is a bit of clickbait / misinformation which is a shame