Difference between revisions of "GeneveOS XOP Definitions"

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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 [[Terminology#C|context switch]], transferring control to a location that is specified in a table.
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 [[Terminology#C|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'''.
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:


{| class="left"
ARGUM  DATA <number>
! style="width:10em" | XOP number
        ...
        XOP  @ARGUM,0
        ...
 
=== Overview ===
 
{| class="plainc"
! XOP argument
! Category
! Category
|-
|-
Line 12: Line 20:
| 6 || [[GeneveOS Video Interface | Video display ]]
| 6 || [[GeneveOS Video Interface | Video display ]]
|-
|-
| 7 || [[MDOS Memory Management Functions | Memory Management ]]
| 7 || [[GeneveOS Memory Management Functions | Memory Management ]]
|-
|-
| 8 || [[GeneveOS Device Operation | Device Operation ]]
| 8 || [[GeneveOS Device Operation | Devices (Files) ]]
|-
|-
| 9 || Utility functions
| 9 || [[GeneveOS Utility Functions | Utility functions]]
|-
|-
| 10 || Mathematical functions
| 10 || Mathematical functions
|}
|}
=== Used workspaces ===
The XOPs use workspaces F0C0 and F0A0.


[[Category:MDOS]]
[[Category:MDOS]]
[[Category:Geneve]]
[[Category:Geneve]]
[[Category:Programming]]
[[Category:Programming]]

Latest revision as of 16:27, 30 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
       ...

Overview

XOP argument Category
5 Keyboard
6 Video display
7 Memory Management
8 Devices (Files)
9 Utility functions
10 Mathematical functions

Used workspaces

The XOPs use workspaces F0C0 and F0A0.