63 lines
865 B
NASM
63 lines
865 B
NASM
cpu 8086
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org 0x7C00
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%include "inc/bpb.asm"
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%include "inc/mbr.asm"
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%include "inc/fcb.asm"
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%include "inc/dpt.asm"
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; kernel stack size in words
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%define stacksize 512
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init: cli
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xor ax, ax
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mov ds, ax
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mov es, ax
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mov ss, ax
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mov sp, ax
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call printf
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%defstr VERSIONSTR VERSION
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db "RDOS ", VERSIONSTR, 0x0A, 0x0D, 0
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push dx
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call dinit
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pop dx
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cmp dl, 0x80
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jc .k
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sub dl, (0x80-2)
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.k: mov [defdrv], dl
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call logdrv
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mov word [0x21*4], int21
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mov word [0x21*4+2], cs
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mov word [curpsp], 0x1000
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mov dl, 0x37
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mov ah, 2
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int 0x21
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int 0x21
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restart:
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hlt: hlt
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jmp hlt
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%include "kernel/syscall.asm"
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%include "kernel/char.asm"
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%include "kernel/fcb.asm"
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%include "kernel/drive.asm"
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%include "kernel/printf.asm"
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section .data
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testfcb: db 0
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db "HELLO ", "COM"
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times 30 db 0
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section .bss
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alignb 2
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stack: resb stacksize
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