amd64/bareMetalOS-0.5.3/os/syscalls/file.asm

   1 ; =============================================================================
   2 ; BareMetal -- a 64-bit OS written in Assembly for x86-64 systems
   3 ; Copyright (C) 2008-2012 Return Infinity -- see LICENSE.TXT
   4 ;
   5 ; File System Functions
   6 ; =============================================================================
   7
   8 align 16
   9 db 'DEBUG: FILESYS  '
  10 align 16
  11
  12
  13 ; This source acts as an abstraction layer between the OS and an actual File
  14 ; System driver. A check can go here to detect the actual FS used and call the
  15 ; appropriate FS driver.
  16 ;
  17 ; Example:
  18 ; os_file_read:
  19 ;       cmp [os_FS], 1  ; FAT16
  20 ;       je os_fat16_file_read
  21 ;       cmp [os_FS], 2  ; FAT32
  22 ;       je os_fat32_file_read
  23 ;       etc...
  24
  25
  26 ; -----------------------------------------------------------------------------
  27 ; os_file_read -- Read a file from disk into memory
  28 ; IN:   RSI = Address of filename string
  29 ;       RDI = Memory location where file will be loaded to
  30 ; OUT:  Carry is set if the file was not found or an error occured
  31 os_file_read:
  32         jmp os_fat16_file_read
  33 ; -----------------------------------------------------------------------------
  34
  35
  36 ; -----------------------------------------------------------------------------
  37 ; os_file_write -- Write a file from memory to disk
  38 ; IN:   RSI = Memory location of data to be written
  39 ;       RDI = Address of filename string
  40 ;       RCX = Number of bytes to write
  41 ; OUT:  Carry is set if an error occured
  42 os_file_write:
  43         jmp os_fat16_file_write
  44 ; -----------------------------------------------------------------------------
  45
  46
  47 ; -----------------------------------------------------------------------------
  48 ; os_file_rename -- Rename a file on disk
  49 ; IN:   RSI = Memory location of file name to change
  50 ;       RDI = Memory location of new file name
  51 ; OUT:  Carry is set if the file was not found or an error occured
  52 os_file_rename:
  53         jmp $
  54 ; -----------------------------------------------------------------------------
  55
  56
  57 ; -----------------------------------------------------------------------------
  58 ; os_file_delete -- Delete a file from disk
  59 ; IN:   RSI = Memory location of file name to delete
  60 ; OUT:  Carry is set if the file was not found or an error occured
  61 os_file_delete:
  62         jmp os_fat16_file_delete
  63 ; -----------------------------------------------------------------------------
  64
  65
  66 ; -----------------------------------------------------------------------------
  67 ; os_file_get_list -- Generate a list of files on disk
  68 ; IN:   RDI = location to store list
  69 ; OUT:  RDI = pointer to end of list
  70 os_file_get_list:
  71         jmp os_fat16_get_file_list
  72 ; -----------------------------------------------------------------------------
  73
  74
  75 ; -----------------------------------------------------------------------------
  76 ; os_file_size -- Return the size of a file on disk
  77 ; IN:   RSI = Address of filename string
  78 ; OUT:  RCX = Size in bytes
  79 ;       Carry is set if the file was not found or an error occured
  80 os_file_get_size:
  81         jmp os_fat16_get_file_size
  82 ; -----------------------------------------------------------------------------
  83
  84
  85 ; =============================================================================
  86 ; EOF