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https://github.com/EnderIce2/Fennix.git
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70 lines
1.5 KiB
NASM
70 lines
1.5 KiB
NASM
; Inspired From: https://github.com/MQuy/mos/blob/master/src/kernel/boot.asm
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section .multiboot2
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align 4096
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HEADER_START:
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dd 0xE85250D6
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dd 0
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dd (HEADER_END - HEADER_START)
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dd 0x100000000 - (HEADER_END - HEADER_START) - 0 - 0xE85250D6
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align 8
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MB2_TAG_START:
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dw 0
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dw 0
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dd MB2_TAG_END - MB2_TAG_START
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MB2_TAG_END:
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HEADER_END:
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KERNEL_VIRTUAL_BASE equ 0xC0000000 ; 3GB
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KERNEL_PAGE_NUMBER equ (KERNEL_VIRTUAL_BASE >> 22) ; 768
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KERNEL_STACK_SIZE equ 0x4000 ; 16KB
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extern x32Multiboot2Entry
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global _start
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section .data
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align 0x1000
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BootPageTable:
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dd 0x00000083
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times ((KERNEL_PAGE_NUMBER) - 1) dd 0
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dd 0x00000083
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times (1024 - KERNEL_PAGE_NUMBER - 1) dd 0
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section .text
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_start:
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mov word [0xb8000], 0x074C ; L
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mov word [0xb8002], 0x076F ; o
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mov word [0xb8004], 0x0761 ; a
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mov word [0xb8006], 0x0764 ; d
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mov word [0xb8008], 0x0769 ; i
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mov word [0xb800a], 0x076E ; n
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mov word [0xb800c], 0x0767 ; g
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mov word [0xb800e], 0x072E ; .
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mov word [0xb8010], 0x072E ; .
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mov word [0xb8012], 0x072E ; .
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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 esp, KernelStack + KERNEL_STACK_SIZE
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push eax ; Multiboot2 Magic
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add ebx, KERNEL_VIRTUAL_BASE
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push ebx ; Multiboot2 Header
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call x32Multiboot2Entry
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Loop:
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hlt
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jmp Loop
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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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