77 lines
1 KiB
PHP
77 lines
1 KiB
PHP
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struc
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{
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.boot_jmp db 3 dup(?)
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}
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disk_read_sectors:
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test byte [drive_lba], 1
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je .lba_read
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push ax
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push bx
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push cx
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xor dx, dx
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div word [sectors_per_track]
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inc dx
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mov [S], dx
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xor dx, dx
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div word [heads_per_cylinder]
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mov [C], ax
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mov [H], dx
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mov ah, 0x2
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mov al, 0x1
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mov ch, byte [C]
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mov cl, byte [S]
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mov dh, byte [H]
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mov dl, [drive_number]
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int 0x13
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jc @f
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pop cx
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pop bx
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pop ax
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add bx, word [bytes_per_sector]
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inc ax
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loop disk_read_sectors
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ret
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@@:
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mov si, msg_error_sector
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call bios_print
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ret
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.lba_read:
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mov word [disk_packet.sectors], cx
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mov word [disk_packet.segment], es
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mov word [disk_packet.offset], bx
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mov word [disk_packet.lba], ax
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mov ds, [disk_packet]
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mov dl, [drive_number]
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mov ah, 0x42
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int 0x13
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ret
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C dw 0x00
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H dw 0x00
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S dw 0x00
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disk_packet:
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db 0x10
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db 0
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.sectors:
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dw 0
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.segment:
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dw 0
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.offset:
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dw 0
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.lba:
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dd 0
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dd 0
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sectors_per_track dw 0
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heads_per_cylinder dw 0
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bytes_per_sector dw 0
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sectors_per_FAT dw 0
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FAT_count db 0
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reserved_sectors dw 0
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root_dir_entries dw 0
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sectors_per_cluster db 0
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