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33 řádky
1.3 KiB
33 řádky
1.3 KiB
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int disk_service_read_data_from_disk(index, file_block_size, data_buffer, data_buffer_segment)
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long* index;
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long file_block_size;
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void* data_buffer;
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int data_buffer_segment;
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{
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//fseek ( disk, (index * SECTOR_SIZE ), SEEK_SET ); // SEEK_SET start offset at index 0 and move 1 * SECTOR_SIZE, and write here.
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//int read = fread(data_buffer, 1, (file_block_size * SECTOR_SIZE), disk);
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//return read;
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#asm
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lsfs_load_data:
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mov dl, [global_disk_identifier]
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mov WORD [DAPACK.lba_addr_dw_low], ax
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mov WORD [DAPACK.blkcnt], 0x01
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mov WORD [DAPACK.db_addr_segment], bx
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mov WORD [DAPACK.db_addr_offset], FSCI
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mov si, DAPACK ; address of "disk address packet"
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mov ah, 0x42 ; READ
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mov dl, [global_disk_identifier]
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int 0x13
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DAPACK:
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.dap_Size: db 0x10 ; This is always 16 bytes (0x10)
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.rev_byte: db 0x0 ; reserved byte, should always be zero
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.blkcnt: dw 0x0 ; int 13 resets this to # of blocks actually read/written
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.db_addr_offset: dw 0x0 ; memory buffer destination address (0:7c00)
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.db_addr_segment: dw 0x0 ; in memory page zero
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.lba_addr_dw_low: dd 0x0 ; put the lba to read in this spot
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.lba_addr_dw_high: dd 0x0 ; more storage bytes only for big lba's ( > 4 bytes )
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#endasm
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}
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