• Jeffrey Lee's avatar
    Add zero page relocation support · 2247d8e9
    Jeffrey Lee authored
      A whole mass of changes to add high processor vectors + zero page relocation support to the Cortex branch of the kernel
      At the moment the code can only cope with two ZeroPage locations, &0 and &FFFF0000. But with a bit more tweaking those restrictions can probably be lifted, allowing ZeroPage to be hidden at almost any address (assuming it's fixed at compile time). If I've done my job right, these restrictions should all be enforced by asserts.
      There's a new option, HiProcVecs, in hdr/Options to control whether high processor vectors are used. When enabling it and building a ROM, remember:
      * FPEmulator needs to be built with the FPEAnchor=High option specified in the components file (not FPEAnchorType=High as my FPEmulator commit comments suggested)
      * ShareFS needs unplugging/removing since it can't cope with it yet
      * Iyonix users will need to use the latest ROOL boot sequence, to ensure the softloaded modules are compatible (OMAP, etc. don't really softload much so they're OK with older sequences)
      * However VProtect also needs patching to fix a nasty bug there - http://www.riscosopen.org/tracker/tickets/294
      The only other notable thing I can think of is that the ProcessTransfer code in s/ARM600 & s/VMSAv6 is disabled if high processor vectors are in use (it's fairly safe to say that code is obsolete in HAL builds anyway?)
      Fun challenge for my successor: Try setting ZeroPage to &FFFF00FF (or similar) so its value can be loaded with MVN instead of LDR. Then use positive/negative address offsets to access the contents.
      File changes:
      - hdr/ARMops - Modified ARMop macro to take the ZeroPage pointer as a parameter instead of 'zero'
      - hdr/Copro15ops - Corrected $quick handling in myISB macro
      - hdr/Options - Added ideal setting for us to use for HiProcVecs
      - s/AMBControl/allocate, s/AMBControl/growp, s/AMBControl/mapslot, s/AMBControl/memmap, s/AMBControl/service, s/AMBControl/shrinkp, s/Arthur2, s/Arthur3, s/ArthurSWIs, s/ChangeDyn, s/ExtraSWIs, s/HAL, s/HeapMan, s/Kernel, s/MemInfo, s/Middle, s/ModHand, s/MoreSWIs, s/MsgCode, s/NewIRQs, s/NewReset, s/Oscli, s/PMF/buffer, s/PMF/IIC, s/PMF/i2cutils, s/PMF/key, s/PMF/mouse, s/PMF/osbyte, s/PMF/oseven, s/PMF/osinit, s/PMF/osword, s/PMF/oswrch, s/SWINaming, s/Super1, s/SysComms, s/TickEvents, s/Utility, s/vdu/vdu23, s/vdu/vdudriver, s/vdu/vdugrafl, s/vdu/vdugrafv, s/vdu/vdupalxx, s/vdu/vdupointer, s/vdu/vduswis, s/vdu/vduwrch - Lots of updates to deal with zero page relocation
      - s/ARM600 - UseProcessTransfer option. Zero page relocation support. Deleted pre-HAL ClearPhysRAM code to tidy the file up a bit.
      - s/ARMops - Zero page relocation support. Set CPUFlag_HiProcVecs when high vectors are in use.
      - s/KbdResPC - Disable compilation of dead code
      - s/VMSAv6 - UseProcessTransfer option. Zero page relocation support.
      Tested with OMAP & Iyonix ROM softloads, both with high & low zero page.
      High zero page hasn't had extensive testing, but boot sequence + ROM apps seem to work.
    Version 5.35, Tagged as 'Kernel-5_35-4_79_2_98_2_48'
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