Jarkko Toivanen
99e0b4debb
- Not relying on Grub/Multiboot setting up stack for us - Preparing Multiboot headers so one day we can has graphical mode
65 lines
1.3 KiB
NASM
65 lines
1.3 KiB
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_VIDEO_REQUEST equ (0 shl 2)
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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 or MULTIBOOT_VIDEO_REQUEST
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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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; dd 0 ; header address
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; dd 0 ; load address
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; dd 0 ; load end address
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; dd 0 ; bss end address
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; dd 0 ; entry address
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; dd 0 ; video mode_type (0:fb, 1:txt) (set flags[2]!)
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; dd 1024 ; video width
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; dd 768 ; video height
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; dd 32 ; video depth
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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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