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55 lines
1000 B
NASM
55 lines
1000 B
NASM
; https://wiki.osdev.org/Higher_Half_x86_Bare_Bones
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; https://wiki.osdev.org/Higher_Half_x86_Bare_Bones_(Backup)
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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 Multiboot2Entry
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extern BootPageTable
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global MB2_start
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section .text
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MB2_start:
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cli
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mov word [0xb8F00], 0x072E ; .
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mov ecx, (BootPageTable - KERNEL_VIRTUAL_BASE)
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mov cr3, ecx
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mov word [0xb8F02], 0x072E ; .
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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 word [0xb8F04], 0x072E ; .
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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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mov word [0xb8F06], 0x072E ; .
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lea ecx, [HigherHalfStart]
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jmp ecx
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HigherHalfStart:
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mov word [0xb8F08], 0x072E ; .
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mov dword [BootPageTable], 0
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invlpg [0]
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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 Multiboot2Entry
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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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