2024-04-14 05:35:43 +00:00
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format binary
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use16
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include '../common/const.inc'
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include '../common/macro.inc'
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2024-04-28 06:41:36 +00:00
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include '../common/bios.inc'
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include '../common/mbr.inc'
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2024-04-14 05:35:43 +00:00
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org MBR_BASE
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cli
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xor ax, ax
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mov ds, ax
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mov es, ax
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mov ss, ax
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mov sp, ax
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cld
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; relocate from 0x7C00 to 0x0600
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mov cx, 0x0100
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mov si, BOOTSECT_BASE
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mov di, MBR_BASE
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rep movsw
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jmp 0x0:start
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2024-05-02 11:34:27 +00:00
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2024-04-14 05:35:43 +00:00
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start:
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2024-04-28 06:41:36 +00:00
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; set LBA
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mov ah, 0x41
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mov bx, 0x55AA
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mov dl, 0x80
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int 0x13
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jc .error_lba
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lea ecx, [PT1]
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.loop:
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mov al, byte [ecx]
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bt ax, 7
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jc .found
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lea eax, [PT4]
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test eax, ecx
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je .error_no_bootable
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add cx, 0xF
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jmp .loop
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.found:
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mov eax, dword [ecx + Partition.lba]
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mov [disk_packet_lba], eax
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mov si, disk_packet
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mov ah, 0x42
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mov dl, 0x80
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int 13
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jc .error_load
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jmp 0x0:BOOTSECT_BASE
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.error_lba:
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mov si, msg_error_lba
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jmp .error_print
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.error_no_bootable:
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mov si, msg_error_bootable
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jmp .error_print
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.error_load:
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mov si, msg_error_load
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.error_print:
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call bios_print
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.end:
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hlt
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jmp $
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2024-04-14 05:35:43 +00:00
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2024-04-28 06:41:36 +00:00
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disk_packet:
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db 0x10
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db 0
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dw 1
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dw BOOTSECT_BASE
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dw 0x0
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disk_packet_lba:
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dd 0x0
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dw 0x0
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msg_error_lba db "We don't support CHS", CR, LF, 0
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msg_error_bootable db "No bootable device found", CR, LF, 0
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msg_error_load db "Can't load partition", CR, LF, 0
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rb MBR_BASE+0x1a8-$
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2024-04-14 05:35:43 +00:00
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UID db 'STUPIDDISK'
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; partition table
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PT1 db 16 dup(0)
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PT2 db 16 dup(0)
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PT3 db 16 dup(0)
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PT4 db 16 dup(0)
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; magic
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db 0x55, 0xAA
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