oldos/secstage.asm

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NASM
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secstage:
mov ah, 02h
mov al, [filetable_ff+3]
mov dl, [BOOT_DRIVE]
mov ch, [filetable_ff]
mov dh, [filetable_ff+1]
mov cl, [filetable_ff+2]
mov bx, main
int 13h
mov al, [BOOT_DRIVE]
jc .error
call main
call dbg_halt_cpu
.error:
cmp cl, 0x0
je .notfound
cmp cl, 0x20
je .notfound
jmp booterror
.notfound:
mov ax, 1301h
mov bx, 7
xor dx, dx
mov bp, .notfoundmsg
mov cx, 22
int 10h
cli
hlt
.notfoundmsg db '"kernel.bin" not found'
times 2560-($-$$) db 0