mirror of
https://github.com/Fennix-Project/Kernel.git
synced 2025-05-28 15:34:33 +00:00
51 lines
809 B
NASM
51 lines
809 B
NASM
[bits 32]
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KERNEL_VIRTUAL_BASE equ 0xC0000000 ; 3GB
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KERNEL_STACK_SIZE equ 0x4000 ; 16KB
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extern multiboot_main
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extern BootPageTable
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global _start
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section .text
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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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_start:
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cli
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mov ecx, (BootPageTable - KERNEL_VIRTUAL_BASE)
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mov cr3, ecx
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mov ecx, cr4
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or ecx, 0x00000010 ; Set PSE in CR4
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mov cr4, ecx
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mov ecx, cr0
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or ecx, 0x80000000 ; Set PG in CR0
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mov cr0, ecx
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lea ecx, [HigherHalfStart]
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jmp ecx
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HigherHalfStart:
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mov [MB_HeaderMagic], eax
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mov [MB_HeaderInfo], ebx
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mov esp, KernelStack + KERNEL_STACK_SIZE
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mov eax, [MB_HeaderMagic]
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mov ebx, [MB_HeaderInfo]
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push ebx ; Multiboot2 Header
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add ebx, KERNEL_VIRTUAL_BASE
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push eax ; Multiboot2 Magic
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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 .bss
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align 16
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KernelStack:
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resb KERNEL_STACK_SIZE
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