2024-05-28 04:54:10 +00:00
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;; File: hdd.asm
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2024-05-02 11:34:27 +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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jmp short _start
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OEM_identifier db 'STUPID '
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bytes_per_sector dw 512
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sectors_per_cluster db 0
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reserved_sectors dw 0
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FAT_count db 0
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root_dir_entries dw 0
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total_sectors dw 0
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media_desc_type db 0
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sectors_per_FAT dw 0
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sectors_per_track dw 18
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heads_per_cylinder dw 2
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hidden_sectors dd 0
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large_sector_count dd 0
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; Extended Boot Record
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drive_number db 0
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reserved db 0
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signature db 0
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volume_id dd 0xB00B135 ; hope mine will grow :'(
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volume_label db 'Stupid Boot'
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system_id db ' '
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_start:
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mov [drive_number], dl
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; ensure int 13h extension
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mov ah, 0x41
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mov bx, 0x55AA
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int 0x13
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jc .error_lba
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2024-05-28 04:54:10 +00:00
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call fat_load_root
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; search
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mov si, stage1_file
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call fat_search_root
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jc .error_not_found
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mov [stage1_start], ax
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xor ax, ax
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mov al, [FAT_count]
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mul word [sectors_per_FAT]
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mov cx, ax
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mov ax, [reserved_sectors]
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xor bx, bx
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call disk_read_sectors
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; load stage 2
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mov ax, LOADER_BASE/0x10
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mov es, ax
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mov ax, [stage1_start]
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xor bx, bx
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call fat_load_binary
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mov dl, [drive_number]
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jmp 0x0:LOADER_BASE
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.error_not_found:
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mov si, msg_error_not_found
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jmp .error
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2024-05-02 11:34:27 +00:00
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.error_lba:
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mov si, msg_error_13ext
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2024-05-28 04:54:10 +00:00
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.error:
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push si
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mov si, msg_error
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call bios_print
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pop si
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call bios_print
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hlt
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jmp $
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;; Function: disk_read_sectors
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;; Read sectors from disk to buffer
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;;
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;; Parameters:
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;;
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;; AX - LBA starting sector
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;; CX - sector count
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;; ES:BX - buffer
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;;
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disk_read_sectors:
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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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include '../common/bios.inc'
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include '../common/fat12.inc'
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msg_error db "ERROR: ", 0
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msg_error_13ext db "We don't support CHS", CR, LF, 0
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msg_error_not_found db "loader not found", CR, LF, 0
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2024-05-02 11:34:27 +00:00
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2024-05-28 04:54:10 +00:00
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stage1_file db "STPDLDR SYS", 0
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stage1_start dw 0x0
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2024-05-02 11:34:27 +00:00
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2024-05-28 04:54:10 +00:00
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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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2024-05-02 11:34:27 +00:00
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rb 0x7C00+512-2-$
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db 0x55, 0xAA
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