Commit ba993cb5 authored by Committed by ROOLBrowse files
Support runtime selection of pagetable format
Runtime selection between long descriptor and short descriptor page table format is now possible (with the decision based on whether the HAL registers any high RAM or not). The main source changes are as follows: * LongDesc and ShortDesc switches are in hdr.Options to control what kernel variant is built * PTOp and PTWhich macros introduced in hdr.ARMops to allow for invocation of functions / code blocks which are specific to the page table format. If the kernel is being built with only one page table format enabled, PTOp is just a BL instruction, ensuring there's no performance loss compared to the old code. * _LongDesc and _ShortDesc suffixes added to various function names, to allow both versions of the function to be included at once if runtime selection is enabled * Most of the kernel / MMU initialisation code in s.HAL is now encased in a big WHILE loop, allowing it to be duplicated if runtime switching is enabled (easier than adding dynamic branches all...
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