mirror of
https://github.com/Fennix-Project/Kernel.git
synced 2025-05-27 23:14:38 +00:00
113 lines
2.0 KiB
NASM
113 lines
2.0 KiB
NASM
; This file is part of Fennix Kernel.
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;
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; Fennix Kernel is free software: you can redistribute it and/or
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; modify it under the terms of the GNU General Public License as
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; published by the Free Software Foundation, either version 3 of
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; the License, or (at your option) any later version.
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;
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; Fennix Kernel 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 Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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[bits 32]
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KERNEL_STACK_SIZE equ 0x4000 ; 16KB
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extern DetectCPUID
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extern Detect64Bit
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extern DetectPSE
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extern DetectPAE
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extern multiboot_main
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extern LoadGDT32
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extern BootPageTable
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extern UpdatePageTable
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extern GDT64.Ptr
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extern GDT64.Code
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extern GDT64.Data
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section .bootstrap.data
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MB_HeaderMagic:
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dq 0
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MB_HeaderInfo:
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dq 0
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section .bootstrap.text
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global Multiboot2_start
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Multiboot2_start:
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cli
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mov [MB_HeaderMagic], eax
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mov [MB_HeaderInfo], ebx
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call DetectCPUID
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cmp eax, 0
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je $
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call Detect64Bit
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cmp eax, 0
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je $
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call DetectPSE
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cmp eax, 0
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je $
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call DetectPAE
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cmp eax, 0
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je $
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mov ecx, cr4
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or ecx, 0x00000010 ; Set PSE in CR4
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or ecx, 0x00000020 ; Set PAE in CR4
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mov cr4, ecx
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call LoadGDT32
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call UpdatePageTable
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mov ecx, BootPageTable
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mov cr3, ecx
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mov ecx, 0xC0000080 ; EFER
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rdmsr
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or eax, 0x800 | 0x100 | 0x1 ; Set LME, LMA, SCE
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wrmsr
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mov ecx, cr0
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or ecx, 0x80000001 ; Set PG and PE in CR0
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mov cr0, ecx
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lgdt [GDT64.Ptr]
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jmp GDT64.Code:HigherHalfStart
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extern UpdatePageTable64
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[bits 64]
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HigherHalfStart:
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mov ax, GDT64.Data
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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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mov ss, ax
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call UpdatePageTable64
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mov rsp, KernelStack + KERNEL_STACK_SIZE
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mov rdi, [MB_HeaderMagic]
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mov rsi, [MB_HeaderInfo]
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push rsi
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push rdi
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call multiboot_main
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.Hang:
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hlt
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jmp .Hang
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section .bootstrap.bss
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align 16
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KernelStack:
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resb KERNEL_STACK_SIZE
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