mirror of
https://gitlab.os-k.eu/os-k-team/os-k.git
synced 2023-08-25 14:03:10 +02:00
184 lines
6.8 KiB
NASM
184 lines
6.8 KiB
NASM
;=----------------------------------------------------------------------------=;
|
|
; GNU GPL OS/K ;
|
|
; ;
|
|
; Desc: Kernel 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/>. ;
|
|
;=----------------------------------------------------------------------------=;
|
|
|
|
%include "boot/loader/multiboot/header.inc"
|
|
%include "boot/loader/multiboot/check.inc"
|
|
%include "boot/loader/cpu/cpu32.inc"
|
|
%include "boot/loader/mem/management.inc"
|
|
%include "boot/loader/io/terminal.inc"
|
|
%include "boot/loader/cpu/cpu.inc"
|
|
%include "boot/loader/mem/structures.inc"
|
|
|
|
global BtStartLoader
|
|
global BtHeader
|
|
extern BtStartKern
|
|
|
|
[BITS 32]
|
|
[section .multiboot]
|
|
|
|
;; MAGNIFICENT MULTIBOOT HEADER FOR GRUB ------------------------------------ ;;
|
|
BtHeader:
|
|
ALIGN 4
|
|
dd MB_HEADER_MAGIC
|
|
dd MB_HEADER_FLAGS
|
|
dd CHECKSUM
|
|
times 5 dd 0x0 ; The unused section (provided for a.out)
|
|
dd MB_VIDEO_MODE
|
|
dd MB_VIDEO_WIDTH
|
|
dd MB_VIDEO_HEIGHT
|
|
dd MB_VIDEO_DEPTH
|
|
|
|
[section .text]
|
|
|
|
;;MULTIBOOT POINT ENTRY FOR GRUB -------------------------------------------- ;;
|
|
BtStartLoader:
|
|
mov esp, KERNEL_STACK ; Setup the stack
|
|
push 0 ; Reset EFLAGS
|
|
popf
|
|
mov [mbInfo], ebx
|
|
mov [mbMagic], eax
|
|
mov ecx, eax ; For debug
|
|
call _loader
|
|
add esp, 8 ; Cleanup arguments "A la MIPS"
|
|
jmp Die ; Aufwiedersehen, but never used
|
|
|
|
;; THE HOLES ---------------------------------------------------------------- ;;
|
|
; ---------------------------------------------------------------------------- ;
|
|
; Prints 'ERR:XX' where 'XX' is the str in AX ;
|
|
; ---------------------------------------------------------------------------- ;
|
|
Error:
|
|
mov word [.code], ax
|
|
push esi
|
|
mov bl, 0x0c
|
|
mov esi, .ergo
|
|
call write32
|
|
pop esi
|
|
jmp Die
|
|
.ergo : db 219, 219, 219, " OS/K Loader Error "
|
|
.code : db "00"
|
|
db 0x0
|
|
; ---------------------------------------------------------------------------- ;
|
|
; Kills the mind of your computer to get it prostrated ;
|
|
; ---------------------------------------------------------------------------- ;
|
|
Die:
|
|
cli
|
|
hlt ; die nooooow
|
|
jmp $
|
|
|
|
;; THE CODE ----------------------------------------------------------------- ;;
|
|
; ---------------------------------------------------------------------------- ;
|
|
; _loader ;
|
|
; ;
|
|
; This is the function that initiates the launch of OS/K. It verifies that ;
|
|
; Grub has properly loaded this loader and makes the appropriate setup so ;
|
|
; that the kernel will work properly ;
|
|
; ;
|
|
; Why this original design ? Because it works well and prevent us to cause ;
|
|
; triple faults by aligment error or too long jumps (yup, it can be a problem);
|
|
; ;
|
|
; ---------------------------------------------------------------------------- ;
|
|
_loader:
|
|
jmp lbegin
|
|
|
|
LOGO db 219, 219, 219, " OS/K", 0
|
|
mbInfo dq 0
|
|
mbMagic dq 0
|
|
|
|
lbegin:
|
|
call clear ; Clear the screen
|
|
|
|
push esi ; Print the logo
|
|
mov bl, 0x0E
|
|
mov esi, LOGO
|
|
call write32
|
|
pop esi
|
|
|
|
;; BEGIN OF CHECKLIST
|
|
call MB_check ; Check Multiboot State, ERR 01
|
|
|
|
call Check_cpuid ; Check if cpuid supported, ERR 02
|
|
call Is64Bits ; Check if long mode available, ERR 03
|
|
call CheckA20 ; Check if A20 is correctly enable, ERR 04
|
|
|
|
;; BEGIN OF WORK
|
|
call Setup_paging ; Enable paging
|
|
call Go64 ; Prepare switch into long mode
|
|
|
|
;call disable_cursor
|
|
|
|
lgdt [GDT64.pointer]
|
|
jmp GDT64.code:_loader64 ; SWITCH
|
|
|
|
[BITS 64]
|
|
|
|
x64_K db "64 bits long mode activated !", 0x0A, 0x0D, 0x0
|
|
GoKernel db "Launching Kernel...", 0
|
|
GoStack db "Initializing the stack...", 0x0A, 0x0D, 0x0
|
|
nokernel db 219, 219, 219, " Error 05 : Kernel returns",0
|
|
|
|
_loader64:
|
|
;; Some cleanup
|
|
mov ax, 0
|
|
mov ss, ax
|
|
mov ds, ax
|
|
mov es, ax
|
|
mov fs, ax
|
|
mov gs, ax
|
|
|
|
call bitemporize
|
|
|
|
mov qword [NextTRAM], TRAM+80*4 ; Because we don't want to overwrite
|
|
|
|
;; Hello world
|
|
mov bl, 0x0A
|
|
mov esi, x64_K
|
|
call write
|
|
|
|
;; Initialize the stack
|
|
mov bl, 0x0F
|
|
mov esi, GoStack
|
|
call write
|
|
|
|
call temporize ; clear the pipeline
|
|
jmp InitStack
|
|
AfterInitStack:
|
|
;; Launch the kernel !
|
|
mov bl, 0x0F
|
|
mov esi, GoKernel
|
|
call write
|
|
|
|
mov rdi, [mbInfo]
|
|
mov rsi, [mbMagic]
|
|
mov rdx, GDT64.code
|
|
call BtStartKern
|
|
|
|
;; We must never reach this point ------------------------------------------- ;;
|
|
call tritemporize ; Let time to see
|
|
call clear
|
|
mov bl, 0x0c
|
|
mov esi, nokernel ; Error 05
|
|
call write
|
|
jmp Die
|