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Expose CLREX via OS_PlatformFeatures
Robert Sprowson authored 
To account for ARM changing their minds about how to clear the exclusive lock on different architectures, provide a function pointer with a known good implementation. This is similar to the run of NOPs returned by OS_PlatformFeatures 0 for those that need it.
If in the future any errata or similar are needed, then there's only 1 place to change it, plus clients don't need their own CPU type detection logic.

Version 5.77. Tagged as 'Kernel-5_77'
a7892833
Name Last commit Last update
..
ExportVals 32-bit Kernel.
ARMops Support for ARMv8
Copro15ops Add new ARMops. Add macros which map the ARMv7/v8 cache/TLB maintenance mnemonics (as featured in recent ARM ARMs) to MCR ops.
EnvNumbers Import from cleaned 360 CD
EtherDevice Change struct layouts for C module compatibility
HALDevice New HAL device ID reservations
HALEntries Add OS_ReadSysInfo 9,6 and 9,7
KernelWS Fix screen redirection when in teletext modes. Fix *ScreenLoad buffer overflow.
KeyWS Delete STB code
ModHand Resolve 2x header clashes
OSEntries Teach the kernel about different memory attributes
OSMem Implement support for cacheable pagetables
OSMisc Expose CLREX via OS_PlatformFeatures
OSRSI6 Add initial support for "physical memory pools"
Options Implement support for cacheable pagetables
PL310 Add ARMops for PL310 L2 cache controller
PublicWS Fix HiProcVecs build. Remove old-style PublicWS definitions.
RISCOS Resync with allocations database
VIDCList Reverse interlace deprecation decision
Variables Import from cleaned 360 CD
VduExt Improve Service_DisplayStatus, Service_DisplayChanged functionality
VideoDevice Update VDU HAL device for new OMAPVideo driver, fix MVA-based cache/TLB maintenance ops aborting on ARMv7, add warning to VDU driver about inconsistent state variables during screen mode changes