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  1. 19 Sep, 2020 1 commit
    • Jeffrey Lee's avatar
      OS_DynamicArea 22 fixes · 88219988
      Jeffrey Lee authored
      Multiple fixes, mostly related to error handling.
      
      1. Ensure R1 is initialised correctly when generating BadPageNumber
      errors (labels 94 & 95). Generally this involves setting it to zero to
      indicate that no call to LogOp_MapOut is required. Failing to do this
      would typically result in a crash.
      2. When branching back to the start of the loop after calling
      GetNonReservedPage, ensure R0 is reset to zero. Failing to do this would
      have a performance impact on LogOp_MapOut, but shouldn't be fatal.
      3. In the main routine, postpone writing back DANode_Size until after
      the call to physical_to_ppn (because we may decide to abort the op
      and return an error without moving a page).
      4. Fix stack offset when accessing PMPLogOp_GlobalTBLFlushNeeded.
      Getting this wrong could potentially result in some TLB maintenance
      being skipped when moving uncacheable pages.
      5. Fix stack imbalance at label 94
      
      Version 6.43. Tagged as 'Kernel-6_43'
      88219988
  2. 15 Aug, 2020 1 commit
    • Timothy E Baldwin's avatar
      Fix cleaning · 5e131c13
      Timothy E Baldwin authored
      Move .gitignore file to root and populate with all temporary paths.
      This fixes .gitignore files being deleted during a ROM build.
      
      
      Version 6.42. Not tagged
      5e131c13
  3. 25 Jul, 2020 1 commit
    • Timothy E Baldwin's avatar
      Disable interrupts whilst checking for keys in OS_ReadC / INKEY · 9d5ab8de
      Timothy E Baldwin authored
      This ensures that on exit from OS_ReadC / INKEY either
      a character is returned or the input buffer is empty,
      and that Portable_Idle is only called when the input
      buffer is empty.
      
      This avoids a 10 microsecond delay and relying on timer
      interrupts to make progress and allows reliably waiting
      for input and another event by:
      
      Disable Interrupts
      Repeat
        Call INKEY(0), exit loop if key pressed
        Check other event, exit loop if key pressed
        Call Portable_Idle
      
      Version 6.42. Tagged as 'Kernel-6_42'
      9d5ab8de
  4. 11 Jul, 2020 1 commit
    • Jeffrey Lee's avatar
      Fix OS_Memory 7 for discontiguous RAM · fb127e47
      Jeffrey Lee authored
      The current OS_Memory 7 implementation uses an address range structure
      returned by HAL_PhysInfo to decide which part of the physical address
      arrangement table to overwrite with RAM information. I suspect the
      original intention was for OS_Memory to use this address range to avoid
      marking the VRAM as DRAM (HAL_PhysInfo is expected to fill in the VRAM
      itself). But by overwriting everything between the start and the end
      address, OS_Memory will also overwrite any non-RAM areas which are
      sandwiched between RAM banks, e.g. the VideoCore-owned RAM on Pi models
      with >1GB RAM. There's also the problem that the address range returned
      by the HAL is using 32bit addresses, so it won't work as-is for RAM
      located above the 4GB barrier.
      
      Fix these issues by reworking the routine so that it ignores the address
      range returned by the HAL and instead detects VRAM by checking the
      IsVRAM flag in the PhysRamTable entry. And for detecting if the ROM is
      running from RAM, instead of using the address range we can rely on the
      flag available via OS_ReadSysInfo 8 (i.e. HAL_PlatformInfo), like
      OS_Memory 8 does.
      
      Also add a simple BASIC program (Dev.PhysInfo) to allow easy checking of
      HAL & OS physical address arrangement tables.
      
      Version 6.41. Tagged as 'Kernel-6_41'
      fb127e47
  5. 01 Jul, 2020 6 commits
    • Jeffrey Lee's avatar
      Add missing AMBControl appspace shrink check · 0634b535
      Jeffrey Lee authored
      Fix GrowFreePoolFromAppSpace (i.e. appspace shrink operation) to issue
      UpCall_MemoryMoving / Service_Memory when attempting to shrink PMP-based
      appspace (i.e. AMBControl nodes). This fixes (e.g.) BASIC getting stuck
      in an abort loop if you try and use OS_ChangeDynamicArea to grow the
      free pool.
      
      Version 6.40. Tagged as 'Kernel-6_40'
      0634b535
    • Jeffrey Lee's avatar
      Fix PMP appspace size check · 5014117d
      Jeffrey Lee authored
      Fix AreaGrow to read appspace size correctly when appspace is a PMP
      (i.e. an AMBControl node). Reading DANode_Size will only report the
      amount of memory currently paged in (e.g. by lazy task swapping),
      causing AreaGrow to underestimate how much it can potentially take from
      the area.
      5014117d
    • Jeffrey Lee's avatar
      Fix GrowFreePool · 1a3c927f
      Jeffrey Lee authored
      Buggy since its introduction in Kernel-5_35-4_79_2_284, GrowFreePool was
      attempting to grow the free pool by shrinking application space, an
      operation which OS_ChangeDynamicArea doesn't support. Change it to grow
      the free pool instead, and fix a couple of other issues that would have
      caused it to work incorrectly (register corruption causing it to request
      a size change of zero, and incorrect assumption that
      OS_ChangeDynamicArea returns the amount unmoved, when really it returns
      the amount moved)
      1a3c927f
    • Jeffrey Lee's avatar
      Fix combined freepool + appspace shrink · 76d04b25
      Jeffrey Lee authored
      When a DA tries to grow by more than the free pool size, the kernel
      should try to take the necessary remaining amount from application
      space. Historically this was handled as a combined "take from freepool
      and appspace" operation, but with Kernel-5_35-4_79_2_284 this was
      changed to use a nested call to OS_ChangeDynamicArea, so first appspace
      is shrunk into the free pool and then the target DA is grown using just
      the free pool.
      
      However the code was foolishly trying to use ChangeDyn_AplSpace as the
      argument to OS_ChangeDynamicArea, which that call doesn't recognise as a
      valid DA number. Change it to use ChangeDyn_FreePool ("grow free pool
      from appspace"), and also fix up a stack imbalance that would have
      caused it to misbehave regardless of the outcome.
      76d04b25
    • Jeffrey Lee's avatar
      Fix shrinkables check in AreaGrow · 86fe0712
      Jeffrey Lee authored
      TryToShrinkShrinkables_Bytes expected both R1 and R2 to be byte counts,
      but AreaGrow was calling with R1 as a byte count and R2 as a page count.
      This would have caused it to request the first-found shrinkable to
      shrink more than necessary, and also confuse the rest of AreaGrow when
      the page-based R2 result of TryToShrinkShrinkables gets converted to a
      byte count (when AreaGrow wants it as a page count)
      86fe0712
    • Jeffrey Lee's avatar
      Fix Service_Memory when shrinking appspace · 323e88c6
      Jeffrey Lee authored
      Update AreaShrink so that (when shrinking appspace) CheckAppSpace is
      passed the change amount as a negative number, so that Service_Memory is
      issued with the correct sign.
      
      Fixes issue reported on the forums, where BASIC was getting confused
      because appspace shrinks were being reported as if they were a grow
      operation:
      
      https://www.riscosopen.org/forum/forums/4/topics/15067
      
      It looks like this bug was introduced in Kernel-5_35-4_79_2_284
      (introduction of PMPs), where the logic for appspace shrinks (which must
      be performed via a grow of the free pool or some other DA) were moved
      out of AreaGrow and into AreaShrink (because appspace shrinks are now
      internally treated as "shrink appspace into free pool")
      323e88c6
  6. 22 Jun, 2020 1 commit
    • Jeffrey Lee's avatar
      Fix OS_Byte 166 for high ZeroPage, make read-only · 0595a541
      Jeffrey Lee authored
      Despite never being properly documented in the RISC OS PRMs, there's
      evidence that Acorn were recommending that third-parties used OS_Byte
      166 for locating the OS_Byte variables well into the mid-1990's:
      
      https://www.riscosopen.org/forum/forums/5/topics/14676#posts-94080
      
      Currently OS builds which use zero page relocation will only return the
      low 16 bits of the address from OS_Byte 166, most likely breaking any
      third-party software which is trying to use it. Attempt to restore
      compatibility by having OS_Byte 166 add the missing high address bits
      into the "next location" value returned in R2, and fix OS_Byte 167 in a
      similar manner (adding into R1).
      
      Additionally, make the values read-only, because the kernel is littered
      with code that uses hard-coded OsbyteVars addresses and so is unlikely
      to do anything sensible if someone was to modify the OsbyteVars address
      that's stored in workspace.
      
      Version 6.39. Tagged as 'Kernel-6_39'
      0595a541
  7. 23 May, 2020 1 commit
    • Ben Avison's avatar
      Mirror OS_AMBControl changes from Pyromaniac · 2991e2df
      Ben Avison authored
      * Create new header file defining symbolic name for OS_AMBControl
        reason codes and flags
      * Implement OS_AMBControl 9 (used to determine required size of buffer
        passed to OS_AMBControl 8 - potential thread safety issue not addressed)
      * Return allocated error numbers in various failure cases
      
      Version 6.38. Tagged as 'Kernel-6_38'
      2991e2df
  8. 23 Mar, 2020 1 commit
    • ROOL's avatar
      Resync with allocations database · b5d0e2dc
      ROOL authored
      Edits to the RISCOS header file should really have gone through the
      allocations system. Fortunately, no harm was done in this case, but a
      minor syntactical change is required in order to bring it in line with
      the automatic redaction scripts used when exporting the header from the
      allocations database.
      
      Version 6.37. Not tagged
      b5d0e2dc
  9. 21 Mar, 2020 1 commit
    • Jeffrey Lee's avatar
      Add scroll mouse support · 66b2aac7
      Jeffrey Lee authored
      * Listen out for PointerV 9, which (RISC OS 5) mouse drivers use to
      indicate scroll wheel updates + extra button status
      * Changes in the state of the extra buttons are treated the same as
      changes to normal mouse buttons: signalled via Event_Mouse, and stored
      in the mouse buffer (for reading via OS_Mouse).
      * Changes in the scroll wheel(s) are signalled via Event_Expansion,4. If
      the event vector call is unclaimed, the kernel's wheel position
      accumulators will be updated
      * Wheel position accumulators can be read via OS_Pointer 2
      * Wheel position accumulators implement "wrap to zero" logic on overflow
      
      This matches RISCOS Ltd's implementation
      (http://www.riscos.com/support/developers/riscos6/input/pointerdevices.html),
      except that:
      
      * The kernel currently doesn't call PointerV 4, so PointerV 9 is the
      only way drivers can report wheel + extra button status
      * Extra mouse buttons don't generate KeyV transitions
      * Our implementation is in the kernel, not an OSPointer module
      
      Version 6.37. Tagged as 'Kernel-6_37'
      66b2aac7
  10. 18 Mar, 2020 3 commits
    • Robert Sprowson's avatar
      Special case extension of aligned RMA claims · 949b03ad
      Robert Sprowson authored
      During ModHandReason_ClaimAligned care is taken to start on a multiple of 32 and end on a multiple of 32 + 16 (such that the next block in the heap would be at +20 same as plain ModHandReason_Claim would do). However, during a ModHandReason_ExtendBlock there's a possibility that those criteria can't be retained, due to having to move to a larger gap elsewhere, leaving the end at an inconvenient +36.
      Similar allocation functions in other OS' don't guarantee to return an extended block with the same alignment, so take the position that for extends we always allocate a fresh block, copy the contents, and free the original. Shrinks are left in place.
      Tested with a random allocator which juggles 16 aligned allocations 50,000 times.
      
      Version 6.36. Tagged as 'Kernel-6_36'
      949b03ad
    • Robert Sprowson's avatar
      Add OS_Module 22 · 0e0d10cc
      Robert Sprowson authored
      Very much like OS_Module 12, but returns the pointer to the PW rather than its contents (or NULL if the module died during init).
      0e0d10cc
    • Robert Sprowson's avatar
      Fix for bad error pointer *Dump'ing with a given start offset · 96988ed4
      Robert Sprowson authored
      Trying to dump a file larger than 2GB starting from an offset below 2GB would fail because the compare checking whether PTR#han > EXT#han accidentally set V which was taken as an error (but with R0 not really being an error block).
      96988ed4
  11. 02 Mar, 2020 3 commits
    • Robert Sprowson's avatar
      Add aligned RMA claim subreason · fd81a66c
      Robert Sprowson authored
      OS_Module
      => R0=24
         R3=size in bytes
         R4=alignment in bytes (must be a power of 2)
      <= R2=base of request
         or error
      Tested with a handful of valid and invalid alignments, and with one grossly larger than the free RMA to trigger an RMA extend to occur.
      
      Version 6.35. Tagged as 'Kernel-6_35'
      fd81a66c
    • Robert Sprowson's avatar
      Fix abort after translating error · 7439cb45
      Robert Sprowson authored
      Reporting invalid parameters to OS_Pointer and OS_ConvertDateAndTime could wander off to bad places due to corrupt LR and/or stack imbalance.
      7439cb45
    • ROOL's avatar
      Record various numbers used in other strands of RISC OS and compatible systems · 81b079e8
      ROOL authored
      Detail:
        * various low-numbered dynamic areas used by RISC OS 6 and Pyromaniac
        * OS_ReadSysInfo 8 host platform classes for VirtualRPC, A9Home, Pyromaniac
        * OS_Byte 0,<not 0> MosVer values for various systems since the BBC micro
        * OS_Byte 129,0,255 (BASIC INKEY -256) values for various RISC OS systems
      
      Admin:
        Discovered that these weren't really recorded anywhere during recent
        allocation request. Some information gleaned from http://beebwiki.mdfs.net
      
      Version 6.34. Not tagged
      81b079e8
  12. 27 Feb, 2020 2 commits
    • Jeffrey Lee's avatar
      Fix phantom DA PostGrow errors · 8c2cae4a
      Jeffrey Lee authored
      Dynamic area PostGrow handlers aren't able to return errors, so the V
      flag is likely undefined. Fix AreaGrow so that it ignores any V-set
      condition returned by the call (especially since the CallPostGrow rapper
      will have clobbered any error pointer).
      
      Fixes issue reported on forums:
      https://www.riscosopen.org/forum/forums/4/topics/14662
      
      Version 6.34. Tagged as 'Kernel-6_34'
      8c2cae4a
    • Robert Sprowson's avatar
      Assign a USB flag · 56230247
      Robert Sprowson authored
      The XHCIDriver module adds 64k to get the register address. In an attempt to phase this out (so the registers are the true base address), assign a flag so that loading a suitable XHCIDriver on an old HAL still works.
      
      Version 6.33. Not tagged
      56230247
  13. 12 Feb, 2020 6 commits
    • Jeffrey Lee's avatar
      Be more forgiving of GraphicsV init failures · e4a8bac2
      Jeffrey Lee authored
      * Update OS_ScreenMode 11's handling of drivers which fail to
      initialise. If there was no previous driver, then instead of trying to
      restore that nonexistant driver, stick with the new one. This is mainly
      to help with the case where the kernel's built in modes aren't accepted
      by the driver, and valid modes only become available once an MDF is
      loaded (this can happen with early OMAP3 chip revisions, which have very
      tight sync & porch limits, causing 90% of the kernel's modes to be
      rejected). If the kernel was to revert to the "no driver" state, then
      loading the MDF would still leave you with no video output.
      * Since we can now end up in a state where a driver is selected but
      hasn't been programmed yet, update OS_Byte 19 to detect this (via the
      magic ScreenBlankDPMSState value of 255) and avoid waiting for VSync
      * Update RemovePages & InsertRemovePagesExit (screen DA handlers) to
      avoid infinite loops if the screen DA gets shrunk to zero size (was seen
      while attempting to complete the !Boot sequence while no driver was
      active)
      
      Version 6.33. Tagged as 'Kernel-6_33'
      e4a8bac2
    • Jeffrey Lee's avatar
      OS_Byte 19 fixes · 830bc852
      Jeffrey Lee authored
      * Don't wait for VSync if we're in IRQ context, since (a) IRQ handlers
      shouldn't take lots of time, and (b) it may hang the system. Fixes
      https://www.riscosopen.org/tracker/tickets/424
      * Extend the DPMSUtils-inherited "don't wait for VSync if HSync output
      is off" fix to also deal with the case where VSync output is off, since
      it's reasonable to assume that turning off VSync output could also
      prevent the CPU from receiving the associated interrupts.
      830bc852
    • Jeffrey Lee's avatar
      Fixes for zero-size PMPs · 0830af41
      Jeffrey Lee authored
      OS_DynamicArea 21, 22 & 25 were using the value of the PMP page list
      pointer (DANode_PMP) to determine whether the dynamic area is a PMP or
      not. However, PMPs which have had their max physical size set to zero
      will don't have the page list allocated, which will cause the test to
      fail. Normally this won't matter (those calls can't do anything useful
      when used on PMPs with zero max size), except for the edge case of where
      the SWI has been given a zero-length page list as input. By checking the
      value of DANode_PMP, this would result in the calls incorrectly
      returning an error.
      
      Fix this by having the code check the DA flags instead. Also, add a
      check to OS_DynamicArea 23 (PMP resize), otherwise non-PMP DAs could end
      up having page lists allocated for them.
      0830af41
    • Jeffrey Lee's avatar
      Fix stack imbalance in DA release · 3a26f20e
      Jeffrey Lee authored
      In OS_DynamicArea 2, a stack imbalance would occur if an error is
      encountered while releasing the physical pages of a PMP (R1-R8 pushed,
      but only R1-R7 pulled). Fix it, but also don't bother storing R1, since
      it's never modified.
      3a26f20e
    • Jeffrey Lee's avatar
      PMP LogOp_MapOut fixes · a4ab6171
      Jeffrey Lee authored
      * Fix caching of page table entry flags (was never updating R9, so the
      flags would be recalculated for every page)
      * Fix use of flag in bottom bit of R6; if the flag was set, the
      early-exit case for having made all the cacheable pages uncacheable will
      never be hit, forcing it to loop through the full page list instead
      a4ab6171
    • Jeffrey Lee's avatar
      Use correct access permissions during ROM decompression · aae64cb2
      Jeffrey Lee authored
      If HAL+OS are contiguous, the combined image is initially mapped as
      OSAP_None in order to allow for decompression. Fix the discontiguous
      case to use the same permissions
      aae64cb2
  14. 19 Jan, 2020 1 commit
    • Timothy E Baldwin's avatar
      Fix *Dump on (apparently) empty files. · b4b52fa1
      Timothy E Baldwin authored
      Special case for empty files was crashing, fix by removing
      which also supports files which report a size of zero but
      actually contain data such as Unix device nodes and
      Linux procfs.
      
      Error where start outside file adjusted to permit a start
      exactly at the end of a file to permit (apparently) empty
      files with no output. Doing likewise for non-empty files
      is consistent.
      
      Also fix closing file in case of error reading GS format
      from CMOS.
      
      Version 6.32. Tagged as 'Kernel-6_32'
      b4b52fa1
  15. 18 Jan, 2020 1 commit
    • Jeffrey Lee's avatar
      Fix OS_DynamicArea 21 handling of MaxCamEntry · 5f7b9b37
      Jeffrey Lee authored
      OS_DynamicArea 21 was treating MaxCamEntry as if it was the exclusive
      upper bound, when really it's the inclusive bound. The consequence of
      this was that PMPs were unable to explicitly claim the highest-numbered
      RAM page in the system.
      
      Version 6.31. Tagged as 'Kernel-6_31'
      5f7b9b37
  16. 24 Nov, 2019 3 commits
    • Timothy E Baldwin's avatar
      Permit special field in paths passed to OS_CLI · 2ec9e04e
      Timothy E Baldwin authored
      OS_CLI permits commands to be prefixed with a temporary filing
      system, for example "ADFS:Format"
      
      It also passes commands unrecognised to FileSwitch to be executed,
      so "ADFS::HardDisc4.$.!Boot" first sets the temporary filing to
      ADFS then executes ":HardDisc4.$.!Boot".
      
      This does not work if the path contains a special field,
      currently this results in an error as the special filed
      would be lost.
      
      Unfortunately many programs, including the RISC OS source
      fail because of this.
      
      Instead if a filing system prefix with special field
      is found switch to the Temporary filing system and
      treat the whole command as a path to execute. For example
      passing "IXFS#W:$.HardDisc4.!Boot" sets the temporary filing
      system to "IXFS" then executes "IXFS#W:$.HardDisc4.!Boot".
      
      Version 6.30. Tagged as 'Kernel-6_30'
      2ec9e04e
    • Jeffrey Lee's avatar
      Add OS_DynamicArea 27+28, for supporting lots of RAM · 9224a6ca
      Jeffrey Lee authored
      OS_DynamicArea 27 is the same as OS_DynamicArea 5 ("return free
      memory"), except the result is measured in pages instead of bytes,
      allowing it to behave sensibly on machines with many gigabytes of RAM.
      
      Similarly, OS_DynamicArea 28 is the same as OS_DynamicArea 7 (internal
      DA enumeration call used by TaskManager), except the returned size
      values are measured in pages instead of bytes. A flags word has also
      been added to allow for more expansion in the future.
      
      Hdr:OSMem now also contains some more definitions which external code
      will find useful.
      
      Version 6.29. Tagged as 'Kernel-6_29'
      9224a6ca
    • Robert Sprowson's avatar
      Add GENET to the list of HAL devices · a5db413c
      Robert Sprowson authored
      Version 6.28. Not tagged
      a5db413c
  17. 19 Nov, 2019 2 commits
    • Jeffrey Lee's avatar
      Allow reservation of memory pages · 1f84ad9f
      Jeffrey Lee authored
      This change adds a new OS_Memory reason code, 23, for reserving memory
      without actually assigning it to a dynamic area. Other dynamic areas can
      still use the memory, but only the code that reserved it will be allowed
      to claim exclusive use over it (i.e. PageFlags_Unavailable).
      
      This is useful for systems such as the PCI heap, where physically
      contiguous memory is required, but the memory isn't needed all of the
      time. By reserving the pages, it allows other regular DAs to make use of
      the memory when the PCI heap is small. But when the PCI heap needs to
      grow, it guarantees that (if there's enough free memory in the system)
      the previously reserved pages can be allocated to the PCI heap.
      
      Notes:
      
      * Reservations are handled on an honour system; there's no checking that
      the program that reserved the memory is the one attempting to map it in.
      
      * For regular NeedsSpecificPages DAs, reserved pages can only be used if
      the special "RESV" R0 return value is used.
      
      * For PMP DAs, reserved pages can only be made Unavailable if the entry
      in the page block also specifies the Reserved page flag. The actual
      state of the Reserved flag can't be modified via PMP DA ops, the flag is
      only used to indicate the caller's permission/intent to make the page
      Unavailable.
      
      * If a PMP DA tries to make a Reserved page Unavailable without
      specifying the Reserved flag, the kernel will try to swap it out for a
      replacement page taken from the free pool (preserving the contents and
      generating Service_PagesUnsafe / Service_PagesSafe, as if another DA
      had claimed the page)
      
      Version 6.28. Tagged as 'Kernel-6_28'
      1f84ad9f
    • Timothy E Baldwin's avatar
      Remove some obsolete definitions for clarity · a52c5049
      Timothy E Baldwin authored
       * MinAplWork isn't used.
       * SuperMode isn't used and is less well known than "SWI OS_EnterOS".
       * MEMCADR is now only a magic value returned by OS_UpdateMEMC,
         so it is clearer to include it literally with comment.
      
      Added a comment to explain the baffling combination of
      the MEMC1 control register's address with it's value.
      
      
      Version 6.27. Not tagged
      a52c5049
  18. 09 Nov, 2019 1 commit
  19. 05 Nov, 2019 3 commits
    • Jeffrey Lee's avatar
      Add cross-check support to heaptest · 88ae7e18
      Jeffrey Lee authored
      Version 6.26. Tagged as 'Kernel-6_26'
      88ae7e18
    • Jeffrey Lee's avatar
      Add support for HeapReason_GetSkewAligned · b954559e
      Jeffrey Lee authored
      Detail:
      Similar to HeapReason_GetAligned, GetSkewAligned is used for allocating
      aligned blocks (with optional boundary limit). However instead of using
      the logical address of the user portion of the block for the alignment
      calculation, it uses an arbitrary offset specified in R5. This makes
      it useful for clients such as the PCI module, which care about the
      physical alignment of blocks rather than logical alignment.
      
      Admin:
      Tested with heaptest
      b954559e
    • Jeffrey Lee's avatar
      Fix heap testbed · 071a9656
      Jeffrey Lee authored
      Detail:
      Kernel-5_44 tweaked the heap manager to try and avoid creating small
      free blocks. Adjust HeapTest's block size checks so that it allows for
      this behaviour.
      
      Admin:
      Tested briefly
      071a9656
  20. 20 Oct, 2019 1 commit