Difference between revisions of "GeneveOS XOP Definitions"
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| 6 || [[GeneveOS Video Interface | Video display ]] | | 6 || [[GeneveOS Video Interface | Video display ]] | ||
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| 7 || [[ | | 7 || [[GeneveOS Memory Management Functions | Memory Management ]] | ||
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| 8 || [[GeneveOS Device Operation | | | 8 || [[GeneveOS Device Operation | Devices (Files) ]] | ||
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| 9 || [[GeneveOS Utility Functions | Utility functions]] | | 9 || [[GeneveOS Utility Functions | Utility functions]] | ||
Revision as of 17:28, 24 April 2022
GeneveOS makes frequent use of XOPs and offers them for user programs. An XOP (extended operation) is a special command of the TMS processor family which causes a context switch, transferring control to a location that is specified in a table.
Compared to common architecture concepts, the XOP is TI's way of implementing a system call.
The XOP instruction takes two arguments; the first delivers data for the call, the second is a number from 0 to 15 and indicates the XOP number. In GeneveOS, all system calls are XOP 0 with specific arguments:
ARGUM DATA <number>
...
XOP @ARGUM,0
...
| XOP argument | Category |
|---|---|
| 5 | Keyboard |
| 6 | Video display |
| 7 | Memory Management |
| 8 | Devices (Files) |
| 9 | Utility functions |
| 10 | Mathematical functions |