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Jørn Guldberg committed
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BITS 16
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vsfs_format_disk:
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; When SingOS it booted for the first time,
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; we have to format the disk to create the global structure
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; of the VSFS.
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pusha
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;AH 03h
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;AL Sectors To Write Count
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;CH Track
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;CL Sector
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;DH Head
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;DL Drive
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; Set the es to point to the data segment,
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; this is the global segment, where we calculate all
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; our adresses from
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; ES:BX Buffer Address Pointer
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mov bx, ds
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mov es, bx
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; Set the bx to point to the pointer of the sector we have to write
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; to the disk.
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mov bx, .vsfs_format_disk_buffer
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mov ah, 0x03 ;Write sectors to drive
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mov al, 0x01 ;Number of sectors to write (8 * 512 = 4096 bytes)
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mov cl, 0x01 ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
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mov ch, 0x08
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mov dh, 0x00 ;Head number
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mov dl, [global_disk_identifier] ;Drive number
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int 0x13 ;Low level disk services
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popa
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ret
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.vsfs_format_disk_buffer db 'VSFS v0.1', 13, 10, '(VerySimpelFileSystem)', 13, 10, 'Developed to SingOS', 13, 10, 'by Jorn Guldberg', 13, 10, 0 ; 66 chars + 8 bytes
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times 431 db 0
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dw 8, 0, 9 ; Start index, number of files, next free index
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vsfs_get_fs_info:
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pusha
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mov bx, ds
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mov es, bx
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mov bx, vsfs_loading_buffer
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mov ah, 0x02 ; Read sectors from drive
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mov al, 0x01 ; Number of sectors to read (8 * 512 = 4096 bytes)
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mov ch, 0x08 ; cylinder
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mov cl, 0x01 ; First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
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mov dh, 0x00 ; Head number
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mov dl, [global_disk_identifier] ; Drive number
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int 0x13
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mov si, vsfs_loading_buffer
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call print
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popa
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ret
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vsfs_read_file_index_in_ax:
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; INPUT ax = file index
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; INPUT bx = filebuffer
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pusha ; save all register state
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;call vsfs_convert_index_into_regs
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;mov bx, .buffer_for_svim
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push bx
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mov bx, ds
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mov es, bx
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pop bx
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mov ch, al ; Low 8 bits of cylinder
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; the file index into ch, we need to calculatet this, if the number is larger than 16-bits
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mov ah, 0x02 ; Read sectors from drive
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mov al, 0x01 ; Number of sectors to read (8 * 512 = 4096 bytes)
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mov cl, 0x01 ; First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
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mov dh, 0x00 ; Head number
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mov dl, [global_disk_identifier] ; Drive number
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int 0x13
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popa
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ret
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vsfs_write_file_to_index_in_ax:
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pusha ; save all register state
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;AH 03h
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;AL Sectors To Write Count
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;CH Track
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;CL Sector
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;DH Head
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;DL Drive
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;ES:BX Buffer Address Pointer
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mov bx, ds
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mov es, bx
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xor bx, bx
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;mov bx, .buffer_for_svim
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xor cx, cx
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xor ax, ax
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mov ah, 0x03 ;Write sectors to drive
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mov al, 0x01 ;Number of sectors to write (8 * 512 = 4096 bytes)
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mov cl, 0x03 ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
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mov ch, 0x02
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mov dh, 0x01 ;Head number
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mov dl, [global_disk_identifier] ;Drive number
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int 0x13 ;Low level disk services
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popa
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ret
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vsfs_convert_index_into_regs:
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; This function takes a file index in ax, do the calculations
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; to set the registers to the right place at the disk
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; CH Track
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; CL Sector
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; DH Head
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; The rest of the parameters is set in the read and write function.
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ret
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vsfs_create_file:
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; ax pointer to filename
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; bx size
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; cx fileIndex
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pusha ; save all register state
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mov si, .vsfs_create_file_type_filename
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call print
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; Ask the user for the filename
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xor bx, bx
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xor cx, cx ; are going to be the counter
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xor dx, dx
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.enter_filename_loop:
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push cx
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mov ax, 0x10 ; BIOS call to wait for key
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int 0x16
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cmp ax, 0x1c0d ; enter key
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je .filename_done
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cmp ax, 0x0e08 ; backspace
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jne .no_enter
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pop cx
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cmp cx, 0
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je .enter_filename_loop
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sub cx, 1
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mov bx, .new_filename_buffer
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add bx, cx
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mov BYTE [bx], 0
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; Go back one space
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mov ax, 0x0e08 ; ah=0x0e means teletype output. al=0x08 means backspace character.
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int 0x10
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; Place a NULL
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mov al, 0x0 ; NULL
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int 0x10
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; Go back one space again as the above print of NULL pushes the cursor forward again.
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mov ax, 0x0e08
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int 0x10
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jmp .enter_filename_loop
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.no_enter:
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mov bh, 0x00
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mov bl, 0x02
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mov ah, 0x0E
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int 0x10 ; print char
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pop cx
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mov bx, .new_filename_buffer
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add bx, cx
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mov [bx], al
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add cx, 1
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; filename must only be 120 chars
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cmp cx, 120
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jae .filename_done
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jmp .enter_filename_loop
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.filename_done:
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pop cx ; Cleanup, and now contain filename size
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mov bx, .new_filename_buffer
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add bx, cx
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mov BYTE [bx], 0
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call printCRLF
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; We first need to know the index for the file.
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; The next avaliable index are we going to get from the
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; FSinfo sctor of the disk:
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mov bx, ds
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mov es, bx
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mov bx, vsfs_loading_buffer
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mov ch, 0x08 ; Low 8 bits of cylinder
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; the file index into ch, we need to calculatet this, if the number is larger than 16-bits
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mov ah, 0x02 ; Read sectors from drive
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mov al, 0x01 ; Number of sectors to read (8 * 512 = 4096 bytes)
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mov cl, 0x01 ; First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
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mov dh, 0x00 ; Head number
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mov dl, [global_disk_identifier] ; Drive number
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int 0x13
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mov ax, [vsfs_loading_buffer + 510]
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mov [.to_write_fileindex], ax
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; We have to do modulo 4, to know where in the sector the
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; file entry has to be written
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add DWORD [vsfs_loading_buffer + 510], 1
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add DWORD [vsfs_loading_buffer + 508], 1
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mov bx, vsfs_loading_buffer
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mov ah, 0x03 ;Write sectors to drive
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mov al, 0x01 ;Number of sectors to write (8 * 512 = 4096 bytes)
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mov cl, 0x01 ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
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mov ch, 0x08
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mov dh, 0x00 ;Head number
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mov dl, [global_disk_identifier] ;Drive number
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int 0x13 ;Low level disk services
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; Now we have the index in ax.
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;AH 03h
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;AL Sectors To Write Count
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;CH Track
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;CL Sector
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;DH Head
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;DL Drive
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; Set the es to point to the data segment,
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; this is the global segment, where we calculate all
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; our adresses from
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; ES:BX Buffer Address Pointer
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mov bx, ds
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mov es, bx
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mov bx, [.to_write_fileindex]
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sub bx, 0x07 ; Det skal den bare
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mov cl, bl ; First sector to write (bits 0-5), upper bits of cylinder (bits 6-7)
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; Set the bx to point to the pointer of the sector we have to write
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; to the disk.
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mov bx, .new_filename_buffer
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mov ah, 0x03 ;Write sectors to drive
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mov al, 0x01 ;Number of sectors to write (8 * 512 = 4096 bytes)
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mov ch, 0x08
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mov dh, 0x00 ;Head number
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mov dl, [global_disk_identifier] ;Drive number
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int 0x13 ;Low level disk services
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popa
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ret
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.vsfs_create_file_type_filename db 'Enter filename: ', 0
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.new_filename_buffer times 122 db 0
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.new_file_size dw 0, 0
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.to_write_fileindex dw 0
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vsfs_list_files_command:
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; This function takes the adress of the first sector of the disk
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; which the OS has to know
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; the adress is given by ax
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; Check which registers to save
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pusha
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; Load the master table into memory
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;mov ax, 8 ; file index for master record
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;mov bx, vsfs_loading_buffer ; pointer to the input buffer
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;call vsfs_read_file_index_in_ax ; call the fucntion which read the master record
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; TODO we might want this to be in memory at all times
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; loaded already from boot
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mov bx, ds
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mov es, bx
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mov si, .ls_header
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call print
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mov si, .seperate_line
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call print
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mov BYTE [.ls_counter], 1
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.load_next_fileinfo:
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add BYTE [.ls_counter], 1
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mov bl, [.ls_counter]
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mov cl, bl ; First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
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mov bx, vsfs_loading_buffer
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;mov ch, al ; Low 8 bits of cylinder
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; the file index into ch, we need to calculatet this, if the number is larger than 16-bits
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mov ah, 0x02 ; Read sectors from drive
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mov al, 0x01 ; Number of sectors to read (8 * 512 = 4096 bytes)
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mov ch, 0x08 ; cylinder
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mov dh, 0x00 ; Head number
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mov dl, [global_disk_identifier] ; Drive number
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int 0x13
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mov ax, [vsfs_loading_buffer + 126]
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mov bx, ax
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mov cx, ' '
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mov dx, 'X'
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cmp ax, 0
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je .end_ls
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cmp ax, 10
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ja .index_over_10
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mov [.fileentry_line + 3 ], cx
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mov [.fileentry_line + 4 ], cx
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add bx, 48 ; get ascii value
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mov [.fileentry_line + 5 ], bl
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jmp .stop_index
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.index_over_10:
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cmp ax, 10
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ja .index_over_100
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mov [.fileentry_line + 3 ], cx
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mov [.fileentry_line + 4 ], dx
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mov [.fileentry_line + 5 ], dx
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jmp .stop_index
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.index_over_100:
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mov [.fileentry_line + 3 ], dx
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mov [.fileentry_line + 4 ], dx
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mov [.fileentry_line + 5 ], dx
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.stop_index:
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mov si, .fileentry_line ; printing the buffer
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call print
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mov si, vsfs_loading_buffer ; printing the buffer
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call print
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call printCRLF
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mov si, .seperate_line
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call print
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jmp .load_next_fileinfo
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.end_ls:
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popa
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ret
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.ls_counter db 0
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.ls_header db 'List of files:', 13, 10, 'Index | Filename ', 13, 10, 0
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.seperate_line db '- - - - - - - - - - - - - - - - ', 13, 10, 0
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.fileentry_line db ' 456 | ', 0
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vsfs_loading_buffer times 512 db 0
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