OS kernel in C

slacker · Post by **slacker** » Sat Feb 08, 2003 12:36 pm

Im trying to write a kernel in c..im not using grub and i want my code to start at 0050:0000 in real mode. when i link should i use ld -Ttext 0x500 to specify 0050:0000?
thanks anyone....

Pype.Clicker · Post by **Pype.Clicker** » Sun Feb 09, 2003 5:29 am

LD is a 32 bits only linker, afaik. It will not let you assemble such programs.
What you need is rather something like exe2bin ...

Tim · Post by **Tim** » Tue Feb 11, 2003 1:20 pm

ld is a 32-bit linker, gcc is a 32-bit compiler, as is a 32-bit assembler. To write 16-bit C code you will need a completely different set of tools.

mr. xsism · Post by **mr. xsism** » Tue Feb 11, 2003 5:54 pm

hello,
i suggest you use nasm. it is a great assembler. If u ever need any help with loading or jumping to your kernel, come to #osdev @ irc.wyldryde.net. My name is xsism

Regards,
Mr. xsism

xkazuya · Post by **xkazuya** » Mon Feb 24, 2003 9:06 am

hello.
gcc compiler can generate 16 bit code.
you only add

asm(".code16gcc");

to your source file.

Pype.Clicker · Post by **Pype.Clicker** » Mon Feb 24, 2003 9:41 am

indeed, (and i'm surprised to learn it

but it will still generate 32 bits ELF/COFF object files that completely ignore the segmentation (thus only the TINY model is available for you) and it simply add "db 66 db 67" before instructions so that its 32bits code runs correctly. This definitely suxx and will produce *very* inefficient code.

do not use it ... really.

xkazuya · Post by **xkazuya** » Mon Feb 24, 2003 10:25 am

Now I understand what you say.
It is inefficient.

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