GitLab

Detail:
  This change gets rid of the following switches from the source (picking appropriate code paths for a 32bit HAL build):
  * FixCallBacks
  * UseProcessTransfer
  * CanLiveOnROMCard
  * BleedinDaveBell
  * NewStyleEcfs
  * DoVdu23_0_12
  * LCDPowerCtrl
  * HostVdu
  * Print
  * EmulatorSupport
  * TubeInfo
  * AddTubeBashers
  * TubeChar, TubeString, TubeDumpNoStack, TubeNewlNoStack macros
  * FIQDebug
  * VCOstartfix
  * AssemblingArthur (n.b. still defined for safety with anything in Hdr: which uses it, but not used explicitly by the kernel)
  * MouseBufferFix
  * LCDInvert
  * LCDSupport
  * DoInitialiseMode
  * Interruptible32bitModes
  * MouseBufferManager
  * StrongARM (new CacheCleanerHack and InterruptDelay switches added to hdr/Options to cover some functionality that StrongARM previously covered)
  * SAcleanflushbroken
  * StrongARM_POST
  * IrqsInClaimRelease
  * CheckProtectionLink
  * GSWorkspaceInKernelBuffers
  * EarlierReentrancyInDAShrink
  * LongCommandLines
  * ECC
  * NoSPSRcorruption
  * RMTidyDoesNowt
  * RogerEXEY
  * StorkPowerSave
  * DebugForcedReset
  * AssembleKEYV
  * AssemblePointerV
  * ProcessorVectors
  * Keyboard_Type
  Assorted old files have also been deleted.
Admin:
  Identical binary to previous revision for IOMD & Raspberry Pi builds


Version 5.51. Tagged as 'Kernel-5_51'

Detail:
  This change gets rid of the following switches from the source (picking appropriate code paths for a 32bit HAL build):
  * HAL
  * HAL26
  * HAL32
  * No26bitCode
  * No32bitCode
  * IncludeTestSrc
  * FixR9CorruptionInExtensionSWI
  Various old files have also been removed (POST code, Arc/STB keyboard drivers, etc.)
Admin:
  Identical binary to previous revision for IOMD & Raspberry Pi builds


Version 5.49. Tagged as 'Kernel-5_49'

Detail:
  s/vdu/vdugrafh - Rewrite MergeSpriteAreas so that memory movement is now O(N) instead of O(N^2). Checking for duplicate sprites is still slow (O(N^2) search), but this resolves the main performance bottleneck with the code.
  s/vdu/vdugrafg - Add a variant of SpriteCtrlBlk which skips the call to GetName; this helps MergeSpriteAreas for the common case of a dest area with lots of sprites and a source area with a handful of sprites (SpriteCtrlBlk is now called on the source area once per dest sprite, previously was called on the dest area once per source sprite).
Admin:
  Tested on Raspberry Pi 1, merging Sovereign theme Sprites11 file with itself (2.2MB file, 358 sprites)
  Old code took 860cs, new code takes 18cs (15cs of which appears to be loading the second copy of the file, judging by *SLoad timings)


Version 5.35, 4.79.2.321. Tagged as 'Kernel-5_35-4_79_2_321'

Fix OS_SpriteOp 41 (read pixel) for 4K colour sprites. Update ECF patterns to work sensibly in true colour modes.

Detail:
  s/vdu/vdugrafg - Change SetupSprModeData to calculate SprReadNColour from log2bpp instead of the NColour mode variable - fixes the alpha component being lost when using OS_SpriteOp 41 to read from 4K colour sprites with alpha channels
  s/vdu/vdudriver - Change SetCol30 to generate more sensible ECF colour blocks when in true colour modes. Previously it would treat each byte of the 8 byte ECF pattern as a separate row, and replicate the byte 4 times to produce one colour word per row. However this isn't so great for true colour modes, especially if you have an alpha channel which needs specific values. So to fix the issue, take inspiration from how Paint assumed the ECF patterns worked, and treat 16bpp modes as being a 1x4 pattern and 32bpp modes as being a 1x2 pattern
Admin:
  Tested on BB-xM
  OS_SpriteOp 41 fix fixes Paint colour picker always returning 0 alpha when picking from 4K ARGB sprites
  ECF change fixes Paint's masked sprite background ECF pattern to display properly in true colour modes


Version 5.35, 4.79.2.213. Tagged as 'Kernel-5_35-4_79_2_213'

ModeFlag_GreyscalePalette handling improvements. Issue service calls on certain GraphicsV events. Sprite tweaks and fixes.

Detail:
  hdr/VduExt - Add reason codes used by Service_DisplayChanged & Service_DisplayStatus
  s/vdu/vdugrafg - Remove dependency on SpriteReason_BadReasonCode; just use the size of our lookup table instead. Alter SpriteOp lookup table so that unimplemented ops return an error instead of doing nothing. Fix PutSprite incorrectly using the slow GCOL action plotter if a request was made to plot a sprite using its mask but the sprite has none.
  s/vdu/vdugrafl - Update screen redirection handling to set ModeFlag_GreyscalePalette if switching output to a sprite with a greyscale palette or a RISC OS Select alpha mask. Restore the flag to its correct value when restoring screen output.
  s/vdu/vdupalxx - Update ModeFlag_GreyscalePalette in realtime as the palette is changed
  s/vdu/vduswis - Issue Service_DisplayChanged during OS_ScreenMode 11. Issue Service_DisplayStatus during OS_ScreenMode 65 & 66.
Admin:
  Tested on Iyonix, BB-xM


Version 5.35, 4.79.2.210. Tagged as 'Kernel-5_35-4_79_2_210'

Fix plotting of RISC OS 5 type sprites and masks. Fix hang when attempting to report "alpha mask not supported" error. Fix reading/writing of alpha mask pixels.

Detail:
  s/vdu/vdugrafg - Fixed PutSprite and PlotMask to correctly deal with RISC OS 5 type sprite mode words. Fix infinite loops in PutSpriWideMaskErr casued by R14 getting trashed.
  s/vdu/vdugrafh - Fixed SpriteMaskAddr malfunctioning when trying to calculate addresses in alpha masks. Minor ReadPixelMask & WritePixelMask optimisations.
  s/vdu/vduswis - Fixed OS_ScreenMode 13 & 14 to count "G2" as a valid colour specifier.
Admin:
  Tested on BB-xM
  Should hopefully fix the random hangs reported on the forums when trying to use sprites with alpha masks


Version 5.35, 4.79.2.197. Tagged as 'Kernel-5_35-4_79_2_197'

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

Detail:
  ECFShift/ECFYOffset:
  - hdr/PublicWS - Add ECFShift and ECFYOffset to list of public exports (SpriteExtend was using hardcoded values). Rearrange exports so that VduWorkspace exports are now labelled as such.
  - hdr/KernelWS - Make sure ECFShift & ECFYOffset match their exported locations
  - hdr/OSRSI6, s/Middle - Add OS_ReadSysInfo 6 items 83 & 84, for reading ECFYOffset and ECFShift locations
  Mode flags/VDU variables:
  - Makefile - Add hdr/VduExt to the C header exports
  - hdr/VduExt - Get rid of NotRVVTBarWobblyBits macro and defined VDU variables manually so that Hdr2H will handle them. Begin replacing overly generic 'Flag_*' mode flag definitions with 'ModeFlag_*' instead. Define new flags as required by the new screen/sprite modes. Add OS_ScreenMode reason codes and mode selector format (from s.vdu.vdudecl)
  - NewModes/NEWF2, NewModes/OldPSSrc, NewModes/PSSrc, s.vdu.vdu23, s.vdu.vducursoft, s.vdu.vdudriver, s.vdu.vdugrafg, s.vdu.vdugrafj, s.vdu.vdugrafl, s.vdu.vdumodes, s.vdu.vdupal10, s.vdu.vdupal20, s.vdu.vdupalette, s.vdu.vdupalxx, s.vdu.vduwrch - Renaming Flag_* to ModeFlag_*
  - s.vdu.vdudecl - Remove OS_ScreenMode reason codes & mode selector format definitions; these are now in hdr/VduExt. Flag_* -> ModeFlag_* renaming.
  - s.vdu.vdupalxx - Apply a greyscale palette in PV_SetDefaultPalette if the greyscale mode flag is set
  New sprite types:
  - s.vdu.vdudriver - Extend GenerateModeSelectorVars to deal with the wide mask flag, 64K sprites, and the new RISC OS 5 sprite mode word format.
  - s.vdu.vdugrafdec - Store more information about the sprite in the SprReadNColour ... SprLog2BPC block.
  - s.vdu.vdugrafg - Update SpriteVecHandler to be able to detect whether RISC OS 5 format sprites are allowed palettes. Update SetupSprModeData to store the extra sprite info that's defined in vdugrafdec. Update PutSprite to fault any sprites with wide masks - SpriteExtend must be used for that (once implemented!)
  - s.vdu.vdugrafh - Update WritePixelColour to avoid temporary poking of NColour VDU variable for 8bpp sprites. Correctly replicate data when writing to RISC OS 5 format sprites. Update ReadPixelMask, WritePixelMask, SpriteMaskAddr, GetMaskspWidth to deal with wide masks. Delete obsolete bounce_new_format_masks routine.
  - s.vdu.vdugrafi - Comment updated to reflect new reality
  - s.vdu.vdugrafj - Get rid of unused code block in CreateHeader/PostCreateHeader. Update SanitizeSGetMode to generate RISC OS 5 style sprite mode words where applicable. Update DecideMaskSize to rely on GetMaskspWidth for calculating mask width.
  - s.vdu.vdugrafl - Update SwitchOutputToSprite/SwitchOutputToMask to deal with the new sprite formats. Allow PushModeInfoAnyMonitor to fail.
  - s.vdu.vduswis - Extended OS_ReadModeVariable to cope with new sprite types
  Misc:
  - s.vdu.vdudriver - Fixed bug with VIDCList copying where any -1 value in the structure would terminate the copy, instead of only -1 as a control item number
  - s.vdu.vduswis - Implemented OS_ScreenMode 13 (Mode string to specifier), 14 (mode specifier to string), and 15 (set mode by string). Mostly as per ROL's specs, but minus support for teletext attributes, and plus support for new RISC OS 5 attributes (L... layout specifier, 4096 & 24bpp packed modes, etc.)
  - s.vdu.vduwrch - Pick correct default text colours for the new modes
Admin:
  Tested on BB-xM
  Part of an implementation of the Extended Framebuffer Format spec:
  http://www.riscosopen.org/wiki/documentation/show/Extended%20Framebuffer%20Format%20Specification


Version 5.35, 4.79.2.194. Tagged as 'Kernel-5_35-4_79_2_194'

Detail:
  Lots of changes since last version, at least the following:
  * Updated OS timestamp, removed alpha status
  * Negative INKEY OS version changed to &AA
  * GraphicsV is now alocated vector number &2A
  * ROM moved up to &FC000000
  * Max application slot increased to 512 Mbytes (for now)
  * Max size of RMA increased to 256 Mbytes
  * RMA is now first-created dynamic area (so it gets lowest address after
    top of application slot)
  * OS_Memory 10 reimplemeted
  * New OS_ReadSysInfo 6 values 18-22 added
  * OS_ReadSysInfo 8 gains flag bit to indicate soft power-off
  * Misc internal top-bit-set-address fixes
  * *ChangeDynamicArea can take sizes in megabytes or gigabytes
  * Magic word "&off" in R0 passed to OS_Reset powers down if possible
  * Added acceleration: block copy; CLS; text window scroll up; rectangle
    fill
  * Disabled LED flashing in page mode (liable to crash)
  * Masked sprite plot and VDU 5 text avoids reading the screen if possible
  * Framestore made USR mode accessible
  * Fix for VDU 5,127 bug - now relies on font definitions being in extreme
    quarters of memory, rather than bottom half
  * Allocated 64-bit OS_Convert... SWIs
  * IIC errors use allocated error numbers
  * Looks for Dallas RTC before Philips RTC because we're using a Philips
    NVRAM device with the same ID
  * Fix to bug that meant the oscillator in the Dallas RTC wasn't enabled
  * Default mouse type (USB) changed to allocated number
  * Ram disc max size increased to 128 Mbytes (Ursula merge) and made
    cacheable for StrongARMs (not XScale)
  * Branch through zero handler now works in USR mode, by use of a
    trampoline in the system stack to allow PC-relative register storage
  * Address exception handler changed to not use 0 as workspace
  * OS_Memory 13 extended to allow specification of cacheability and access
    privileges
  * Added OS_Memory 16 to return important memory addresses
  * RISCOS_MapInIO() takes cacheable flag in bit 3, access permissions in
    bits 10 and 11, doubly-mapped flag in bit 20, and access permissions
    specified flag in bit 21
  * Bug fix in last version for application abort handlers didn't quite
    work; register shuffle required
  * "Module is not 32-bit compatible" error now reports the module name
  * Default configured language changed from 10 to 11 (now Desktop again)

Version 5.35, 4.79.2.51. Tagged as 'Kernel-5_35-4_79_2_51'

Ursula. Quite a hairy code merge really, so let's hope it is
worth it to someone. What you get (back after 2 or 3 years):
- much more efficient for largish numbers of DAs (relevance
  to current build = approx 0)
- fancy reason codes to support fast update of
  Switcher bar display (relevance = 0)
- support for clamped maximum area sizes, to avoid address
  space exhaustion with big memory (relevance = 0)
- better implementation of shrinkable DAs, performance
  wise (if lots of DAs, relevance = approx 0)
- support for 'Sparse' DAs. Holey dynamic areas, Batman!
  (relevance, go on someone use the darned things)
Moderately development tested on HAL/32bit ARM9 desktop.
Note the Switcher should be compiled to use the new
reason codes 6&7, for fabled desktop builds.

Also, during this work, so I could see the wood for the
trees, redid some source code clean up, removing pre-Medusa
stuff (like I did about 3 years ago on Ursula, sigh). That's
why loads of source files have changed. The new DA stuff
is confined pretty much to hdr.KernelWS and s.ChangeDyn.

Ta.

Version 5.35, 4.79.2.38. Tagged as 'Kernel-5_35-4_79_2_38'

* Added ARM_IMB and ARM_IMBRange SWIs as recommended by ARMv5.
* Some early prototype HAL bits popped in - a lot of source restructuring still
  to come.
* New debug target creates an AIF image with debug information, and translates
  this into an ASCII object file for the 16702B logic analyser.

Version 5.35, 4.79.2.1. Tagged as 'Kernel-5_35-4_79_2_1'

Details:
  The Kernel will now compile to produce a pure 32-bit system if No26bitCode is
  set to TRUE.
  If No26bitCode is FALSE, then the Kernel will be a standard 26-bit Kernel,
  although some internal changes have taken place to minimise compile
  switches between the two cases. See Docs.32bit for more technical info.

  The hardest part was the flood-fill...

Other changes:
  Pointer shape changes now take place on the next VSync, rather than actually
  WAITING for the VSync. Turning the Hourglass on shouldn't slow your machine
  down by 5% now :)

  Lots of really crusty pre-IOMD code removed.

Admin:
  Tested in 32 and 26-bit forms in a limited desktop build. Basically, this
  will need to see a lot of use to iron out difficulties. I'd like anyone who
  has a non-frozen project to at least attempt using this Kernel.

Version 5.23. Tagged as 'Kernel-5_23'