56 lines
976 B
NASM
56 lines
976 B
NASM
format elf
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use32
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MULTIBOOT_PAGE_ALIGN equ (1 shl 0)
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MULTIBOOT_MEMORY_INFO equ (1 shl 1)
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MULTIBOOT_AOUT_KLUDGE equ (1 shl 16)
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MULTIBOOT_HEADER_MAGIC equ 0x1BADB002
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MULTIBOOT_HEADER_FLAGS equ MULTIBOOT_PAGE_ALIGN or MULTIBOOT_MEMORY_INFO
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MULTIBOOT_CHECKSUM equ -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
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.multiboot: align 4
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dd MULTIBOOT_HEADER_MAGIC
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dd MULTIBOOT_HEADER_FLAGS
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dd MULTIBOOT_CHECKSUM
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section '.bss' writable align 16
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stack_bottom:
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rb 16384
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stack_top:
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section '.text' executable
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public _start
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extrn kmain
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disable_cursor:
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pushf
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push eax
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push edx
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mov dx, 0x3D4
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mov al, 0xA ; low cursor shape register
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out dx, al
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inc dx
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mov al, 0x20 ; bits 6-7 unused, bit 5 disables the cursor, bits 0-4 control the cursor shape
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out dx, al
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pop edx
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pop eax
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popf
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ret
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_start:
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; Setup stack
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;mov esp, stack_top
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; Call the main kernel function.
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call disable_cursor
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call kmain
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@@:
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cli
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hlt
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jmp @b
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