A fast and easily customised operating system
for ARM devices
Service_Portable
Programmer's Reference Manuals
» Part 16 – Service Calls
» Service_Portable
Service_Portable
(Service &8A)
| Entry | |
|---|---|
| R1 | 138 (&8A) |
| R2 | 0 = Power up |
| 1 = Power down | |
| R3 | Bitmask of ports which will be powered down/have been powered up |
| Exit | |
|---|---|
| R1 | Preserved (do not claim, unless R3 = 0) |
| R2 | Preserved |
| R3 | Bitmask – set bits means no objection of power up/down |
Use
This service is issued before powering down, or after powering up certain hardware.
Notes
If this results in R3 = 0, the service should be claimed to prevent it being needlessly passed round remaining modules.