rdos/boot/kernel.asm

56 lines
777 B
NASM

cpu 8086
org 0x7C00
%include "inc/bpb.asm"
%include "inc/mbr.asm"
%include "inc/fcb.asm"
%include "inc/dpt.asm"
; kernel stack size in words
%define stacksize 512
init: cli
xor ax, ax
mov ds, ax
mov es, ax
mov ss, ax
mov sp, ( stack+stacksize )
print_banner: mov si, banner
mov ah, 0x0e
xor bx, bx
.loop: lodsb
int 0x10
cmp al, 0x0D
jnz .loop
cmp dl, 0x80
jc .k
sub dl, (0x80-2)
.k: mov [defdrv], dl
call dskrst
mov bx, testfcb
call fcbfst
hlt: hlt
jmp hlt
%include "kernel/far.asm"
%include "kernel/fcb.asm"
%include "kernel/drive.asm"
section .data
%defstr VERSIONSTR VERSION
banner: db "RDOS ", VERSIONSTR, 0x0A, 0x0D
testfcb: db 0
db "HELLO ", "COM"
times 30 db 0
section .bss
stack: resb stacksize