VFPSupport_FastAPI (changes)
Showing changes from revision #2 to #3:
Added | Removed | Changed
Warning: The current and/or previous revision contained markup errors which prevented proper diff analysis. A guess at markup correction has been made but the diff may not be a truly accurate reflection of the real changes.
» VFPSupport
» SWI Calls
» VFPSupport_FastAPI
VFPSupport_FastAPI
(SWI &58EC5)
| Entry | |
|---|---|
| - | |
| Exit | |
|---|---|
| R0 | Workspace pointer to pass in R12 to all routines |
| R1 | CheckContext function pointer |
| R2 | CreateContext function pointer |
| R3 | DestroyContext function pointer |
| R4 | ChangeContext function pointer |
| All other registers preserved | |
Use
This call allows you to gain direct access to the most commonly used SWIs, to allow speed-critical systems to avoid the overhead of the kernel SWI despatcher.
Notes
When calling the above functions, the following rules apply:
- The processor must be in a privileged mode
- R14_svc must be corruptible (i.e. if in an interrupt handler, you must have previously saved it)
- R12 must contain the given workspace pointer (R0)
Other than the above, the functions behave exactly like their SWI counterparts.
See also
Social
Follow us on
and
and
ROOL Store
Buy RISC OS Open merchandise here, including SD cards for Raspberry Pi and more.