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os-k/boot/loader/loader.asm
2019-03-04 22:34:07 +01:00

73 lines
3.5 KiB
NASM

;=----------------------------------------------------------------------------=;
; GNU GPL OS/K ;
; ;
; Desc: Kernel (second stage) Loader for OS/K ;
; (x86_64 architecture only) ;
; ;
; ;
; Copyright © 2018-2019 The OS/K Team ;
; ;
; This file is part of OS/K. ;
; ;
; OS/K is free software: you can redistribute it and/or modify ;
; it under the terms of the GNU General Public License as published by ;
; the Free Software Foundation, either version 3 of the License, or ;
; (at your option) any later version. ;
; ;
; OS/K is distributed in the hope that it will be useful, ;
; but WITHOUT ANY WARRANTY; without even the implied warranty of ;
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;
; GNU General Public License for more details. ;
; ;
; You should have received a copy of the GNU General Public License ;
; along with OS/K. If not, see <https://www.gnu.org/licenses/>. ;
;=----------------------------------------------------------------------------=;
%define DEBUG
[BITS 32]
[global _start]
[ORG 0x100000] ; Where GRUB loads us.
%include "boot/loader/multiboot.inc"
_start:
mov ax, cs ; correcting cs after the horrible far jump
mov ds, ax ; hm... And ds too
mov es, ax ; And es because it is jealous
;mov [Bootdrv], dl
xor dl, dl
jmp 0x0000:main ; pas sûr
MB_header:
align 4
dd MB_HEADER_MAGIC
dd MB_HEADER_FLAGS
dd CHECKSUM
dd MB_header ; Header address
dd _start ; Address of code entry point
dd 00 ; (end of code) not necessary
dd 00 ; (bss) not necessary
dd MB_start ; entry address GRUB will start at
MB_start:
mov esp, KERNEL_STACK ; Setup the stack
push 0 ; Reset EFLAGS
popf
push eax ; 2nd argument is magic number
push ebx ; 1st argument multiboot info pointer
call main
add esp, 8 ; Cleanup 8 bytes pushed as arguments
jmp Die
;; BEGIN OF THE HOLE -------------------------------------------------------- ;;
Die:
cli
hlt ; die nooooow
;jmp 0xF000:0xFFF0
jmp $
;; END OF THE HOLE ---------------------------------------------------------- ;;
main:
jmp Die