The Place to Start for Operating System Developers
https://f.osdev.org/
Well, in theory, it could work. But it's not something we're looking into for the time being.SoLDMG wrote:That's not actually possible on a calculator, no. I'm still going to look at the C compiler source code and see if I can contribute somehow though.
Well, the process table is a fixed size for performance reasons. It's always located at 0x8000 and each entry is aligned, so it's faster to do a context switch (which really matters when you have a slower system). The real challenges that other osdevers might not have faced, though, are much different. One example is that KnightOS is written entirely in assembly - not because I prefer assembly, but because there are no C compilers for z80 that are good enough. Also, I'm directly interacting with the Flash chip rather than with some controller that makes it look like a block device, so I had to design my own filesystem considering that few filesystems are designed around the NAND Flash constraints. One thing that's easier, though, is that these calculators have a fixed hardware list and I don't have to worry so much about drivers and such.MessiahAndrw wrote:What challenges have you encountered in KnightOS while working with such a limited system that most of us OSdevers don't encounter? Why the 32 process limit (do you used a fixed-size structure for storing processes?)
Code: Select all
curl -s http://www.knightos.org/install-sdk | bash
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#include <display.h>
/* Warning! C support in KnightOS is highly experimental. Your milage may vary. */
void main(void) {
SCREEN *screen;
get_lcd_lock();
screen = screen_allocate();
screen_clear(screen);
draw_string(screen, 0, 0, "Hello world!");
screen_draw(screen);
while (1);
}
You have a really nice design.SirCmpwn wrote:Redesigned website, looks prettier now: http://www.knightos.org/
Thanks for the kind words! We're using assembly with a lot of macros, not function calls.Bender wrote:Tested out the online compiler and emulator, and it works nice on both PC and mobile platforms. Also, the SDK and your build system looks very professional.
By the way, what language are you using to develop applications? It looks like assembly with the addition of function calls.