os-k/boot/loader/loader.asm

;=----------------------------------------------------------------------------=;
;                            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