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https://gitlab.os-k.eu/os-k-team/os-k.git
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159 lines
6.2 KiB
NASM
159 lines
6.2 KiB
NASM
;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Kernel Loader for OS/K ;
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; (x86_64 architecture only) ;
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; ;
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; ;
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; Copyright © 2018-2019 The OS/K Team ;
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; ;
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; This file is part of OS/K. ;
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; ;
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; OS/K is free software: you can redistribute it and/or modify ;
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; it under the terms of the GNU General Public License as published by ;
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; the Free Software Foundation, either version 3 of the License, or ;
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; (at your option) any later version. ;
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; ;
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; OS/K is distributed in the hope that it will be useful, ;
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; but WITHOUT ANY WARRANTY; without even the implied warranty of ;
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;
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; GNU General Public License for more details. ;
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; ;
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; You should have received a copy of the GNU General Public License ;
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; along with OS/K. If not, see <https://www.gnu.org/licenses/>. ;
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;=----------------------------------------------------------------------------=;
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%include "boot/loader/multiboot/header.inc"
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%include "boot/loader/multiboot/check.inc"
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%include "boot/loader/cpu/cpu32.inc"
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%include "boot/loader/mem/management.inc"
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%include "boot/loader/io/terminal.inc"
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%include "boot/loader/cpu/cpu.inc"
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%include "boot/loader/mem/structures.inc"
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[BITS 32]
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[global MB_start]
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[section .multiboot]
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;; MAGNIFICENT MULTIBOOT HEADER FOR GRUB ------------------------------------ ;;
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MB_header:
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ALIGN 4
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dd MB_HEADER_MAGIC
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dd MB_HEADER_FLAGS
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dd CHECKSUM
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[section .text]
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;;MULTIBOOT POINT ENTRY FOR GRUB ------------------------------------------- ;;
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MB_start:
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mov esp, KERNEL_STACK ; Setup the stack
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push 0 ; Reset EFLAGS
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popf
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push eax ; 2nd argument is magic number
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push ebx ; 1st argument multiboot info pointer
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mov ecx, eax ; For debug
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call _loader
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add esp, 8 ; Cleanup arguments "A la MIPS"
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jmp Die ; Aufwiedersehen, but never used
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;; THE HOLES ---------------------------------------------------------------- ;;
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; ---------------------------------------------------------------------------- ;
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; Prints 'ERR:XX' where 'XX' is the str in AX ;
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; ---------------------------------------------------------------------------- ;
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Error:
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mov word [CODE], ax
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push esi
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mov bl, 0x0c
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mov esi, ERGO
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call write32
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pop esi
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jmp Die
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ERGO : db "A", 219, 219, " Error "
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CODE : db "00"
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db 0x0
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; ---------------------------------------------------------------------------- ;
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; Kills the mind of your computer to get it prostrated ;
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; ---------------------------------------------------------------------------- ;
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Die:
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cli
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hlt ; die nooooow
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jmp $
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;; THE CODE ----------------------------------------------------------------- ;;
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; ---------------------------------------------------------------------------- ;
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; _loader ;
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; ;
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; This is the function that initiates the launch of OS/K. It verifies that ;
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; Grub has properly loaded this loader and makes the appropriate setup so ;
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; that the kernel will work properly ;
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; ;
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; Why this original design ? Because it works well and prevent us to cause ;
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; triple faults by aligment error or too long jumps (yup, it can be a problem);
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; ;
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; ---------------------------------------------------------------------------- ;
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_loader:
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jmp lbegin
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LOGO: db 219, 219, 219, " OS/K", 0
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lbegin:
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call clear ; Clear the screen
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;; BEGIN OF CHECKLIST
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call MB_check ; Check Multiboot State
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call Check_cpuid ; Check if cpuid supported
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call Is64Bits ; Check if long mode available
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call CheckA20 ; Check if A20 is correctly enable
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;; BEGIN OF WORK
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call Setup_paging ; Enable paging
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call Go64 ; Prepare switch into long mode
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push esi ; Print the logo
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mov bl, 0x0E
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mov esi, LOGO
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call write32
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pop esi
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;call disable_cursor
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lgdt [GDT64.pointer]
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jmp GDT64.code:_loader64 ; SWITCH
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[BITS 64]
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x64_K db "Now in x64 long mode", 0x0A, 0x0D, 0x0
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GoKernel db "Launching Kernel...", 0
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_loader64:
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;; Some cleanup
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mov ax, 0
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mov ss, ax
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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call bitemporize
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mov qword [NextTRAM], TRAM+80*4 ; Because we don't want to overwrite
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;; Hello world
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mov bl, 0x0A
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mov esi, x64_K
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call write
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mov bl, 0x0F
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mov esi, GoKernel
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call write
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;; Launch the kernel !
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call tritemporize ; Let time to see
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extern StartKern
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jmp StartKern
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;; We must never reach this point ------------------------------------------- ;;
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jmp Die
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