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34 lines
1.3 KiB
NASM
34 lines
1.3 KiB
NASM
; The first 8192 bytes of the kernel binary must contain a header with
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; predefined (and sometimes "magic") values according to the Multiboot standard.
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; Based on these values, the boot loader decides whether and how to load the
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; kernel -- which is compiled and linked into an ELF file.
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; To make this possible with your StuBS kernel, the linker places the following
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; entry `multiboot_header` at the very beginning of the file thanks to the
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; linker script (located in compiler/sections.ld).
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[SECTION .multiboot_header]
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; Include configuration
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%include 'boot/multiboot/config.inc'
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; Multiboot Header
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align 4
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multiboot_header:
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dd MULTIBOOT_HEADER_MAGIC_OS ; Magic Header Value
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dd MULTIBOOT_HEADER_FLAGS ; Flags (affects following entries)
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dd MULTIBOOT_HEADER_CHKSUM ; Header Checksum
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; Following fields would have been required to be defined
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; if flag A_OUT KLUDGE was set (but we don't need this)
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dd 0 ; Header address
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dd 0 ; Begin of load address
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dd 0 ; end of load address
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dd 0 ; end of bss segment
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dd 0 ; address of entry function
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; Following fields are required for video mode (flag MULTIBOOT_VIDEO_MODE)
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dd 0 ; Mode: 0 = Graphic / 1 = Text
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dd MULTIBOOT_VIDEO_WIDTH ; Width (pixels / columns)
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dd MULTIBOOT_VIDEO_HEIGHT ; Height (pixels / rows)
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dd MULTIBOOT_VIDEO_BITDEPTH ; color depth / number of colors
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