First commit
This commit is contained in:
commit
521fd1be2b
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@ -0,0 +1,2 @@
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*.bin
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*.img
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@ -0,0 +1,15 @@
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.SUFFIXES:
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.SUFFIXES: .bin .asm
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all: bootsector.bin
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.asm.bin:
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nasm -fbin -o $@ $<
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clean:
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rm -f *.bin *.img
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run: bootsector.bin
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qemu-system-i386 -fda $<
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.PHONY: all clean run
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@ -0,0 +1,43 @@
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cpu 8086
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org 0x7c00
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jmp short _code
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nop
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; 1440K floppy
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; BPB
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oemidentifier db "nor86 "
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byterpersector dw 512
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sectorspercluster db 1
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reservedsectors dw 1
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fats db 2
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rootdirentries dw 224
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totalsectors dw 2880
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mediadescription db 0xf0
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sectorsperfat dw 9
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sectorspertrack dw 18
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heads dw 2
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hiddensectors dd 0
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totalsectorslarge dd 0
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; EBPB
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drivenumber db 0 ; useless
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reserved db 0 ; winnt flags
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signature db 0x29 ; mkdosfs uses this, dunno how 0x28 differs
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serial dd 0
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volumelabel db "nor86 boot "
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fstype db "FAT12 "
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_code:
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jmp 0:_start
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_start:
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mov ax, 0x0e40
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int 0x10
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hang:
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hlt
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jmp hang
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times 510-($-$$) db 0
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db 0x55, 0xaa
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