52 lines
1.6 KiB
ArmAsm
52 lines
1.6 KiB
ArmAsm
[bits 16] ; 16 bit real mode code
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[org 0x7C00] ; Origin at 0x7C00 (upper end of memory)
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start:
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mov si, _str_hello ; si = source index
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call printString
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mov al, 0x97
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call printCharacter
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; mov al, 0x17 ; read the remaining 16 tracks
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; mov ch, 0x1 ; .... on track 1 ....
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; mov cl, 0x2 ; .... starting at sector 2
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; mov bx, 0x1000 ; 0x1000 is a standard kernel start location
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; mov es, bx
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; xor bx ; bx = 0, es:bs = 0x1000:0
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; call loadFloppyDiskSectors
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; push ax
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; mov ax, bx
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; add ax, 0x2200 ; we just read 0x2200 bytes, move pointer in memory
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; mov bx, ax
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; pop ax
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; mov al, 0x17 ; read 18 sectors per track for all future tracks
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; mov cl, 0x1 ; start at sector 1 for all future tracks
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; mov di, 0x2 ; abuse di as a counter, while (di < 80)
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; ; di is technically a destination index for stream
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; ; ops, but nothing is using it ATM, so gimme.
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; _next_floppy_track:
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; mov ch, di
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; call loadFloppyDiskSectors
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; push ax
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; mov ax, bx
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; add ax, 0x2400 ; each floppy track is (512b*18s)=0x2400 bytes long
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; mov bx, ax
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; pop ax
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; inc di
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; push cx
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; mov cx, 0x50
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; cmp di, cx ; di < 80 ?
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; jlt _next_floppy_track
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mov si, _str_floppydone
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call printString
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jmp $
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%include "libinterrupt.S"
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_str_hello db 'Piquant v0.1 Bootloader', 0xA, 0
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_str_floppydone db 'Kernel loaded', 0xA, 0
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times 510 - ($ - $$) db 0 ; fill up to 510 bytes with 0
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dw 0xAA55 ; magic bootloader signature
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