Написание ОС с нуля: Часть 1 — Загрузчик
;;;
;; ;;
;; Copyright © HexOS author 2019–2022. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License;
;; ;;
;;;
format binary as «sec»
org 7E00h
start:
use16
; header zone
jmp second_entry
nop
; import zone
include «second.inc»
; executable zone
second_entry:
cls
; printsz msg0
mov ah, 02h
mov al, 08h
mov cx, 0012h; 0012h is correct
; dl was not modified
mov bx, 8100h
movs es, 0000h
int 13h
jc err0
mov sp, 810h
movs ds, 8100h
jmp 0000:8100h
err0:
; construct BSOD stylish
cls
MOV AH, 06h
XOR AL, AL
XOR CX, CX
MOV DX, 184Fh
MOV BH, 17h
INT 10h
; print data
printsz bsod0
jmp endall
endall:
cli
hlt
jmp $-2
; data zone
msg0 db «HexOS Second-stage Bootloader v2.2.1 by Ivan Chetchasov», newline
db «LOG: Loading HAT16 filetable», newline, 00h
bsod0:
db newline
db newline
db » ((((((», newline
db » ((::::::(ERROR OCCURRED», newline
db » ((:::::::(At position: 00007E32h», newline
db » (:::::::((», newline
db » (::::::(Reason: cannot load kernel», newline
db » :::(:::::(Maybe your disk is corrupted», newline
db » :::(:::::(So try to re-install system», newline
db » :::(:::::(Or append file 'System/kernel.hex'», newline
db » (:::::(To your disk with other PC», newline
db » (:::::((be careful, maybe virus killed», newline
db » (:::::(your PC, don`t infect other one!)», newline
db » :::(::::::(», newline
db » :::(:::::::((», newline
db » :::((:::::::(», newline
db » ((::::::(», newline
db » ((((((», newline
db newline
db «Errcode: 0000000Dh Errname: ERROR_CANNOT_LOAD_KERNEL», newline, 00h
; filler
times 200h*16–1+start-$ db 00h
; magic
db EOF
