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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
..
5thColumn RISC OS 3.71 kernel changes merged.
HAL Define some extra platform feature flags
MemMaps RISC OS 3.71 kernel changes merged.
PrivDoc RISC OS 3.71 kernel changes merged.
!ReadMe Import from cleaned 370 CD
0197276.02 Import from cleaned 370 CD
32bit * Converted to building with ObjAsm (but still a single object file using ORG).
32bitAPIs Commit of kernel as featured in release 5.00.
A540Extend Import from cleaned 370 CD
AMBControl Import from cleaned 370 CD
CallbackChange Miscellaneous stuff.
GraphicsV Merged in changes from Castle
HiResTTX Added 256-colour version of the (high-resolution only) teletext code, and support for teletext when hardware scroll is disabled. Both are required for Tungsten.
Kernel Import from cleaned 370 CD
KernlSplit Import from cleaned 370 CD
MMUControl Import from cleaned 370 CD
ModPostServ HAL device support, and a couple of new service calls.
Mode22 Import from cleaned 370 CD
Modes Import from cleaned 370 CD
MonLead Import from cleaned 370 CD
PageFlags Lots of Tungsten work.
PaletteV Import from cleaned 370 CD
RO370 Lots of Tungsten work.
ReadSysInf Lots of Tungsten work.
ReadUnsigned Merge over some changes from the Cortex branch
TVmodesMed,dde