GeneveOS XOP Definitions
Revision as of 17:24, 24 April 2022 by Mizapf (talk | contribs) (Mizapf moved page MDOS XOP Definitions to GeneveOS XOP Definitions)
MDOS 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. 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 | Device Operation |
| 9 | Utility functions |
| 10 | Mathematical functions |