Rev 1086 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1085 | pj | 1 | -------------------------------------- |
| 2 | DOS_fXXX Demo |
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| 3 | |||
| 4 | by |
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| 5 | |||
| 6 | Paolo Gai pj@sssup.it |
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| 7 | and |
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| 8 | Gabriele Bolognini gabrieleb@sssup.it |
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| 9 | 2001 |
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| 10 | |||
| 11 | -------------------------------------- |
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| 12 | |||
| 13 | The DOS_fXXX functions provided into ll/i386/x-dos.h are a few |
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| 14 | shortcuts that can be used to call INT21's DOS calls. |
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| 15 | |||
| 16 | These functions can be used to read and write files before/after |
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| 17 | the kernel goes into i386 protected mode. |
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| 18 | |||
| 19 | THEY CANNOT BE USED IF YOU BOOT WITH GRUB. |
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| 20 | |||
| 21 | -------------------------------------- |
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| 22 | |||
| 23 | The demo is composed by: |
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| 24 | |||
| 25 | MAKEFILE The makefile used to compile the application; |
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| 26 | dosfs is the rule to compile the application |
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| 27 | README.TXT This file |
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| 28 | INITFILE.C The init file (only RR) |
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| 29 | DOSFS.C The DOS_fread and DOS_fwrite demo |
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| 30 | |||
| 31 | -------------------------------------- |
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| 32 | |||
| 33 | The demo works as follows: |
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| 34 | - Into __kernel_register_levels__() the demo reads up to 1000 bytes from |
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| 35 | myfile.txt |
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| 36 | - Then, into the main() function it prints the contents of the buffer at |
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| 37 | screen |
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| 38 | - Finally, at the end of the system it writes a file called myfile.out |
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| 39 | with up to 30 of the first bytes of the buffer |
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| 40 | |||
| 41 | The demo should work on any processor speed, and does not use keyboard or |
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| 42 | graphics. |
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| 43 | |||
| 44 | Bug: at the moment (01 Jun 2001) sometimes the demo hangs when using |
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| 45 | the one-shot timer. |
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| 46 |