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Define some extra platform feature flags
Robert Sprowson authored 
For disc based applications (ie. those that don't know the architecture at build time, like a ROM would) we have OS_PlatformFeatures to provide an abstract way of seeing when new chunks of instructions get added. Back at ARMv6 ARM deprecated SWP, but currently we have no way of knowing that at runtime without grubbing round the coprocessor registers.
Add 3 new flags
* One to say LDR/STREX is (not) available
* One to say that SWP/SWPB is (not) available
* One to say that CLREX and LDR/STREX[B|H|D] is (not) available
shame it took a few goes for ARM to bring in these variants, requiring 3 flags not 1.

Also:
Condition the exception on vector read code on No32bitCode, rather than just having it permanently disabled.
Improve the HAL device docs.

Tested on a StrongARM Risc PC, Model B Pi, and Titanium.

Version 5.35, 4.79.2.303. Tagged as 'Kernel-5_35-4_79_2_303'
96546b5a
Name Last commit Last update
Dev Make OS_Memory 8 return more correct values
Doc Kernel merged
Docs Define some extra platform feature flags
NewModes Add support for the new RISC OS 5 style sprite mode word. Add partial support for alpha channel sprite masks. Implement OS_ScreenMode reasons 13-15
Resources/UK Delegate L2 (and below) cache init at power on/reset to the HAL
TestSrc Adopt some switches from Hdr:Machine/Machine
h Header defs for Pi Compute module and IIC
hdr Define some extra platform feature flags
o Clean reimport of hdr.RISCOS (real commit date 2008-03-28 by bavison), without any of the 3rd party allocations.
rm Clean reimport of hdr.RISCOS (real commit date 2008-03-28 by bavison), without any of the 3rd party allocations.
s Define some extra platform feature flags
.gitattributes Added 'UnConv' error (see also HdrSrc).
BlackLog Initial revision
Changes Import from cleaned 360 CD
HelpStrs Adoption of *CONFIGURE/STATUS CACHE commands
LICENSE Clean reimport of hdr.RISCOS (real commit date 2008-03-28 by bavison), without any of the 3rd party allocations.
Makefile Hand off ownership of GPIODevice
MkClean,fd7 Mostly device stuff.
MkExport,fd7 Import from cleaned 360 CD
MkInstall,fd7 Added a disc install phase as an analogue of the export phase
MkRom,fd7 Makefile recreated from fragments
Version Back to odd numbered development
VersionASM Define some extra platform feature flags
VersionNum Define some extra platform feature flags