Linked by Hadrien Grasland on Fri 28th Jan 2011 20:37 UTC
OSNews, Generic OSes It's recently been a year since I started working on my pet OS project, and I often end up looking backwards at what I have done, wondering what made things difficult in the beginning. One of my conclusions is that while there's a lot of documentation on OS development from a technical point of view, more should be written about the project management aspect of it. Namely, how to go from a blurry "I want to code an OS" vision to either a precise vision of what you want to achieve, or the decision to stop following this path before you hit a wall. This article series aims at putting those interested in hobby OS development on the right track, while keeping this aspect of things in mind.
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RE[4]: Machine language or C
by Neolander on Sat 29th Jan 2011 19:58 UTC in reply to "RE[3]: Machine language or C"
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Not necessarily. You can create wrappers in order to use the arch-specific assembly functions you need in your language of choice, and keep all the logic written in this language.

As an example, if I need to output bytes on one of the ports of my x86 CPU, all I have to do is to create a "C version" of the OUTB assembly instruction, using macros and inline assembly, and after that I can use it in the middle of my C code at native speed.

With GCC's inline assembly, it'd look something like this :
"#define outb(value, port) \
__asm__ volatile ( \
"outb %b0,%w1" \
::"a" (value),"Nd" (port) \

Yes, it's ugly, but you only have to do it once.

Edited 2011-01-29 20:09 UTC

Reply Parent Score: 1