GitLab

Define that bit 12 of the RISCOS_AddRAM flags indicates that the
supplied start, end, and sigbits values are in 4KB units instead of byte
units. This allows a 44 bit address space to be used, higher than the 40
bit LPAE limit.

The page list that RISCOS_AddRAM constructs will now store everything in
4KB page units, however any RAM above 4GB will currently be thrown away
when the list is later transferred to the PhysRamTable which the OS uses
at runtime.

Version 6.54. Tagged as 'Kernel-6_54'

Previously the CAM sat inside a fixed 16MB window, restricting it to
storing the details of 1 million pages, i.e. 4GB of RAM. Shuffle things
around a bit to allow this restriction to be removed: the CAM is now
located just above the IO region, and the CAM start address /
IO top will calculated appropriately during kernel init. This change
paves the way for us to support machines with over 4GB of RAM.

FixedAreasTable has also been removed, since it's no longer really
necessary (DAs can only be created between the top of application space
and the bottom of the used IO space, and it's been a long time since
we've had any fixed bits in the middle of there)

This adds initial support for the "long descriptor" MMU page table
format, which allows the CPU to (flexibly) use a 40-bit physical address
space.

There are still some features that need fixing (e.g. RISCOS_MapInIO
flags), and the OS doesn't yet support RAM above the 32bit limit, but
this set of changes is enough to allow for working ROMs to be produced.

Also, move MMUControlSoftCopy initialisation out of ClearWkspRAM, since
it's unrelated to whether the HAL has cleared the RAM or not.

PageShifts is only accessed with "ADRL xx, PageShifts-1"; adjust the
alignment so that PageShifts-1 is word aligned, to try and avoid us
hitting any ADRL range limits (which has happened with the runtime
ShortDesc vs. LongDesc selection from future commits)

Remove the lazy initialisation of PhysIllegalMask and instead manually
initialise it during MMU init. This fixes some situations where the lazy
initialisation doesn't work (PhysIllegalMask isn't in a zero-initialised
area of workspace, so if the HAL isn't doing a RAM clear then it could
be garbage)

Historically many commands of BBC Micro heritage were not included
in UitilyModules, but were separated out into a separate pseudo-module,
SysCommsModule, to allow for them to be terminated by any non-letter
for compatibility with the BBC Micro.

However with the introduction of `Oscli_HashedCommands` in August 1999
(and earlier in Ursula branch) this was broken except for *FX, *KEY,
*OPT and *TV, which are handled by a special case making SysCommsModule
redundant.

SysCommsModule is an obsitcle to making the kernel assemble to relocatable
AOF as it requires Module_BaseAddr to have 2 different values and therefore
be a absolute varaible instead of a section relative symbol.

This commit does not change behaviour with `Oscli_HashedCommands` enabled
which is the default, except for listing the command under UtilityModule
in *Help output. Which `Oscli_HashedCommands` disable this change removes
the special behaviour.

Version 6.53. Tagged as 'Kernel-6_53'

Currently RISCOS_AccessPhysicalAddress allows the caller to specify the
permissions/properties of the mapped memory by directly specifying some
of the L1 page table entry flags. This will complicate things when
adding support for more page table formats, so change it so that
standard RISC OS page flags are used instead (like the alternate entry
point, RISCOS_AccessPhysicalAddressUnchecked, already uses).

Also, drop the "RISCOS_" prefix from RISCOS_AccessPhysicalAddress and
RISCOS_ReleasePhysicalAddress, and remove the references to these
routines from the HAL docs. These routines have never been exposed to
the HAL, so renaming them and removing them from the docs should make
their status clearer.

Version 6.52. Tagged as 'Kernel-6_52'

Somewhere along the way, BangCam became redundant. Get rid of it.

RISCOS_LogToPhys and OS_Memory 20 (compatibility page) changed to use
suitable subroutines for reading the page tables instead of accessing
them directly.

Change the DecodeL1/L2Entry routines so that instead of accepting a page
table entry as input, they accept a (suitable-aligned) logical address
and fetch the page table entry themselves. This helps insulate the
calling code from the finer details of the page table format.

GetPageFlagsForR0IntoR6 & MoveCAMatR0toR3 changed to use
logical_to_physical & physical_to_ppn, to reduce the number of routines
which are performing direct page table access.

Reduce the number of routines which directly examine the page tables, by
changing OS_FindMemMapEntries to use logical_to_physical.

In preparation for the addition of long descriptor page table support,
start moving low-level page table routines into their own file
(s.ShortDesc) so that we can add a corresponding long descriptor
implementation in the future.

* logical_to_physical, MakePageTablesCacheable,
MakePageTablesNonCacheable, AllocateBackingLevel2, AMB_movepagesin_L2PT,
AMB_movecacheablepagesout_L2PT, AMB_moveuncacheablepagesout_L2PT
routines, and PageNumToL2PT macros, all moved to s.ShortDesc with no
changes.
* Add new UpdateL1PTForPageReplacement routine (by splitting some code
out of s.ChangeDyn)

ppn_to_physical, logical_to_physical, physical_to_ppn & ppn_to_physical
have now all been changed to accept/receive 64bit physical addresses in
R8,R9 instead of a 32bit address in R5. However, where a phys addr is
being provided as an input, they may currently only pay attention to the
bottom 32 bits of the address.

OS_EvaluateExpression is documented as applying GSTrans to any strings
within the expression, but did instead GSTrans the entire expression.

This would result in a sequence such as:

    *Set Alias$@RunType_FD1 "Basic -quit ""%0"" %*1"
    *If "<Alias$@RunType_FD1>"="" Then Set Alias$@RunType_FD1 @RunType_FFB %*0

raising a "Unknown operand" error as the quote in the variable
were interpreted as expression syntax. See
https://www.riscosopen.org/forum/forums/5/topics/16127

Unfortunately skipping the initial GSTrans breaks common code such as:

    If "<StrED_cfg$Dir>" = "" AND <Ctrl$Pressed> = 0 Then ...
    If "<Zap$OSVsn>" <> "" Then SetEval ZapFonts$OSVsn <Zap$OSVsn>

Fix by applying a GSTrans transformation over unquoted parts of the
expression, then applying GSTrans over the quoted strings.

Version 6.51. Tagged as 'Kernel-6_51'

    *BASIC
    *SetMacro Macro Test
    SYS "OS_GSTrans", """<Macro>""", &10000, &100

Would result in an erroneous "String not recognised" error as the
end of macro variable was reached before closing quote.
Fix by reordering the checks.

It's the only privileged-mode stack which doesn't have its address
exposed via OS_ReadSysInfo 6. Expose it so that software which wants to
know its address can read it instead of relying on hardcoded values.

Tested on Raspberry Pi 4

Version 6.50. Tagged as 'Kernel-6_50'

The correct amount of space is now reserved for Kbuffs, and there's no
need to have a 1MB gap where the old PhysicalAccess window was.

Tested on Raspberry Pi 4

Although storage maps are useful for allowing the fixed areas of the
memory map to be relocated, it isn't clear in the current definition
what the size of each area is, and it's hard to ensure that all the
areas are kept at the correct alignment.

Replace the current basic workspace definition with one which makes use
of the new ASpace macro, to allow addresses to be calculated
automatically based on the size & alignment of each area. Also output
the address of each area in the build log for easy
debugging/verification.

Binary unchanged.

This ensures that the debug macros may be freeley placed without
concern for if LR and CPSR contain important values, and avoid the
of code only working because the debug code changes the flags with
the effect of a bug appearing when debugging is enabled.

Version 6.49. Tagged as 'Kernel-6_49'

Previously the supervisor stack was read-only in user mode, but since
the supervisor stack is typically empty when the CPU is in user mode,
it's questionable whether any software actually makes use of this
facility.

To simplify support for the long descriptor page table format (which
doesn't support the user-RO + privileged-RW access mode), let's
try and remove usermode SVC stack access completely.

Tested on Raspberry Pi 4

Version 6.48. Tagged as 'Kernel-6_48'

Change ZeroPage calculation so that ZeroPage can be at
any 64K aligned address.


Version 6.47. Not tagged

Check now works if ROMLimit is precisely at the end
of ROM causing ROMLimit to not be a valid immediate.

Move ROM constant to KernelWS with the reset of the memory layout.
Add ASSERT to guard against workspace colliding with ROM.

Rather than specifing absolute addresses for the workspace,
use ObjASM's storage layout support.

In HandleServiceModeTranslation, make sure WsPtr is initialised
correctly before trying to use it. Fixes system heap corruption when
responding to Service_ModeTranslation (most likely overwriting part of
ChocolateMABlocks, and causing a crash when loading future modules)

Fixes issue reported on forums:
https://www.riscosopen.org/forum/forums/11/topics/15973

Version 6.47. Tagged as 'Kernel-6_47'

Detail:
RamFS now supports disc sizes up to 2GB-4KB, so raise the dynamic area limit from 508MB.

Admin:
Tested with a disc size up to 928MB

Version 6.46. Tagged as 'Kernel-6_46'

Changes in Kernel-6_44 left an undefined symbol in s.HAL in DebugTerminal_Rdch. These mods resolve that, and also add a note in s.Kernel to reflect this usage.

Version 6.45. Tagged as 'Kernel-6_45'

Previously both `RdchInkey` and `PageTest` enabled interrupts after
running callbacks before calling Portable_Idle with the result that
callback could be delayed until the next interrupt.

* Change `process_callback_chain` to leave interrupts disabled, and
  rename accordingly.
* Remove redundant check of CallBack_Flag.
* In `PageTest` move running calbacks into `CtrlShiftTest`, so that
  it is immediately before the test.
* Re-enable interrupts at appropriate locations.

Tested on StrongARM Risc PC.

Version 6.44. Tagged as 'Kernel-6_44'

This was introduced on 2002-10-07 in Kernel-5_35-4_79_2_48
the removed on 2002-11-30 in Kernel-5_35-4_79_2_51 as it
was "liable to crash".

Version 6.43. Not tagged

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'

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

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'

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 a...

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'

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.

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)