161 lines
6.2 KiB
NASM
161 lines
6.2 KiB
NASM
;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Kernel (second stage) 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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%define DEBUG
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[BITS 32]
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[global _start]
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[ORG 0x100000] ; Where GRUB loads us.
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%include "boot/loader/multiboot/header.inc"
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;; NORMAL ENTRY POINT, BUT A LITTLE BIT UNUSED SINCE WE NEVER USE IT BECAUSE...
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_start:
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mov ax, cs ; correcting cs after the horrible far jump
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mov ds, ax ; hm... And ds too
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mov es, ax ; And es because it is jealous
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;mov [Bootdrv], dl
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xor dl, dl
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jmp 0x0000:_loader ; pas sûr
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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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dd MB_header ; Header address
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dd _start ; Address of code entry point
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dd 00 ; (end of code) not necessary
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dd 00 ; (bss) not necessary
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dd MB_start ; entry address GRUB will start at
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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
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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
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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 dword [0xb8000], 0x4f524f45
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mov dword [0xb8004], 0x4f3a4f52
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mov dword [0xb8008], 0x4f204f20
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mov byte [0xb800a], al
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mov byte [0xb800c], ah
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mov byte [0xb800d], 0x4f
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jmp Die
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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 0xF000:0xFFF0
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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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%include "boot/loader/multiboot/check.inc"
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%include "boot/loader/cpu/cpuid.inc"
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%include "boot/loader/mem/structures.inc"
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%include "boot/loader/mem/management.inc"
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lbegin:
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call MB_check
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call Check_cpuid
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call Is64Bits
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call CheckA20
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call Setup_paging
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call Go64
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lgdt [GDT64.pointer]
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jmp GDT64.code:l64
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[BITS 64]
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%include "boot/loader/io/terminal.inc"
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%include "boot/loader/io/ata.inc"
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%include "boot/loader/cpu/cpu.inc"
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Salut db 0x09, " Booting OS/K ", 0x09, 0x0A, 0x0D, 0x0
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ReadAttempt db 0x09, " Attempt to read a sector with ATA commands...", 0
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l64:
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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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;; Hello world
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mov bl, 0x0A
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mov esi, Salut
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call write
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;; Read ATA
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mov bl, 0x0F
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mov esi, ReadAttempt
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call write
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call temporize
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;; Reading a sector of the disk
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mov bl, 1
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mov bh, 1
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call ata_read
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jmp Die
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