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Code: Select all

int kmain(void){
    unsigned char *vidmem = (char*) 0xB8000;
    vidmem[0] = 65; // 'A' 
    vidmem[1] = 0x07; //whie text on black screen
}

Code: Select all

[global start]

start:
    extern kmain // _kmain caused error
    call kmain
    cli
    hlt

Code: Select all

OUTPUT_FORMAT("binary")
ENTRY(start)
SECTIONS
{
  .text  0x100000 : {
    code = .; _code = .; __code = .;
    *(.text)
    . = ALIGN(4096);
  }
  .data  : {
    data = .; _data = .; __data = .;
    *(.data)
    . = ALIGN(4096);
  }
  .bss  :
  {
    bss = .; _bss = .; __bss = .;
    *(.bss)
    . = ALIGN(4096);
  }
  end = .; _end = .; __end = .;
}

Code: Select all

all:
	gcc -c kernel.c -o kernel.o
	nasm -f aout boot.asm -o boot.o
	ld -T link.ld -o kernel.bin boot.o kernel.o
	qemu -kernel kernel.bin