kernel and linker

Kernel.c:

/*
*  kernel.c
*/

#include <stdio.h>
#include <stdlib.h>

void kmain(void)
{
    FILE * pFile;
    char c;

    const char *str = "DoorsOS v0.3";
    printf("Hello World!\n");
    char *vidptr = (char*)0xb8000;  //video mem begins here.
    unsigned int i = 0;
    unsigned int j = 0;

    /* this loops clears the screen
    * there are 25 lines each of 80 columns; each element takes 2 bytes */
    while(j < 80 * 25 * 2) {
        /* blank character */
        vidptr[j] = ' ';
        /* attribute-byte - light grey on black screen */
        vidptr[j+1] = 0x07;
        j = j + 2;
    }

    j = 0;

    /* this loop writes the string to video memory */
    while(str[j] != '\0') {
        /* the character's ascii */
        vidptr[i] = str[j];
        /* attribute-byte: give character black bg and light grey fg */
        vidptr[i+1] = 0x07;
        ++j;
        i = i + 2;
    }
    return;
}

linker.ld:

/*
*  link.ld
*/
OUTPUT_FORMAT(elf32-i386)
ENTRY(start)
SECTIONS
 {
   . = 0x100000;
   .text : { *(.text) }
   .data : { *(.data) }
   .bss  : { *(.bss)  }
 }