OS_PlatformFeatures 35 (changes)

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OS SWI Calls

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OS_ PlatformFeatures 35

(SWI &6D)

Use

The purpose of this call is to return a function pointer that can be called to clear the exclusive monitor lock in a way that is independent of the CPU.

Notes

The routine must be called with a valid, full descending, descending stack pointer in R13 and a return address in LR. The routine will preserve all registers, including theCPSR.

The very simplest implementation will be a CLREX instruction, though other CPU variants and silicon implementations may require more complex implementations. The OS will take these into account.

See also

• Maintenance requirements for the local exclusive monitor