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DOS_fXXX Demo
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by
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Paolo Gai          pj@sssup.it
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and
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Gabriele Bolognini gabrieleb@sssup.it
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2001
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The DOS_fXXX functions provided into ll/i386/x-dos.h are a few
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shortcuts that can be used to call INT21's DOS calls.
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These functions can be used to read and write files before/after
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the kernel goes into i386 protected mode.
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THEY CANNOT BE USED IF YOU BOOT WITH GRUB.
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The demo is composed by:
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MAKEFILE     The makefile used to compile the application;
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             dosfs is the rule to compile the application
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README.TXT   This file
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INITFILE.C   The init file (only RR)
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DOSFS.C      The DOS_fread and DOS_fwrite demo
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The demo works as follows:
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- Into __kernel_register_levels__() the demo reads up to 1000 bytes from
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  myfile.txt
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- Then, into the main() function it prints the contents of the buffer at
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  screen
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- Finally, at the end of the system it writes a file called myfile.out
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  with up to 30 of the first bytes of the buffer
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The demo should work on any processor speed, and does not use keyboard or
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graphics.
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Bug: at the moment (01 Jun 2001) sometimes the demo hangs when using
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the one-shot timer.
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