55 lines
1.0 KiB
NASM
55 lines
1.0 KiB
NASM
[ORG 0x7c00]
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jmp short start
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nop
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;Disk description table
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db "EttinOS " ;Disk label
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dw 0x200 ;Bytes per sector
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db 0x1 ;Sectors per cluster
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dw 0x1 ;Sectors reserved for the boot record
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db 0x2 ;Number of copies of the FAT
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dw 0xe0 ;Number of directory entries
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dw 0xb40 ;Number of logical sectors
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db 0xf0 ;Media descriptor type
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dw 0x9 ;Sectors per FAT
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dw 0x12 ;Sectors per track
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dw 0x2 ;Number of heads
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dd 0x0 ;Number of hidden sectors
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dd 0x0 ;Number of LBA sectors
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dw 0x0 ;Drive number
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db 0x29 ;Drive signature
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dd 0x0 ;Volume ID
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db "EttinOS " ;Volume label
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db "FAT12 " ;File system type
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start:
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;Initialise ds
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mov ax, 0x0
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mov ds, ax
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;Load the system
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;Set the source
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mov dl, 0x0
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mov dh, 0x0
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mov ch, 0x0
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mov cl, 0x2
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;Set the destination
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mov ax, 0x1000
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mov es, ax
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mov bx, 0
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;Set the size
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mov al, 0x20
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;Load
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mov ah, 0x2
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int 0x13
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;Boot the system
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jmp 0x1000:0
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;Padding
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times 0x1fe-($-$$) db 0
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;Boot signature
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dw 0xaa55
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