a1200   NEWS   APPS   DOCS   ABOUT
a1200
----
a1200
----
Autodocs
 Libraries:
 exec.library
  AVL_AddNode
  AVL_FindFirstNode
  AVL_FindLastNode
  AVL_FindNextNodeByAddress
  AVL_FindNextNodeByKey
  AVL_FindNode
  AVL_FindPrevNodeByAddress
  AVL_FindPrevNodeByKey
  AVL_RemNodeByAddress
  AVL_RemNodeByKey
  AbortIO
  AddDevice
  AddHead
  AddIntServer
  AddLibrary
  AddMemHandler
  AddMemList
  AddPort
  AddResource
  AddSemaphore
  AddTail
  AddTask
  Alert
  AllocAbs
  AllocEntry
  AllocMem
  AllocPooled
  AllocSignal
  AllocTrap
  AllocVec
  Allocate
  AttemptSemaphore
  AttemptSemaphoreShared
  AvailMem
  CacheClearE
  CacheClearU
  CacheControl
  CachePostDMA
  CachePreDMA
  Cause
  CheckIO
  CloseDevice
  CloseLibrary
  ColdReboot
  CopyMem
  CopyMemQuick
  CreateIORequest
  CreateMsgPort
  CreatePool
  Deallocate
  Debug
  DeleteIORequest
  DeleteMsgPort
  DeletePool
  Disable
  DoIO
  Enable
  Enqueue
  FindName
  FindPort
  FindResident
  FindSemaphore
  FindTask
  Forbid
  FreeEntry
  FreeMem
  FreePooled
  FreeSignal
  FreeTrap
  FreeVec
  GetCC
  GetMsg
  InitCode
  InitResident
  InitSemaphore
  InitStruct
  Insert
  MakeFunctions
  MakeLibrary
  ObtainQuickVector
  ObtainSemaphore
  ObtainSemaphoreList
  ObtainSemaphoreShared
  OldOpenLibrary
  OpenDevice
  OpenLibrary
  OpenResource
  Permit
  Procure
  PutMsg
  RawDoFmt
  ReleaseSemaphore
  ReleaseSemaphoreList
  RemDevice
  RemHead
  RemIntServer
  RemLibrary
  RemMemHandler
  RemPort
  RemResource
  RemSemaphore
  RemTail
  RemTask
  Remove
  ReplyMsg
  SendIO
  SetExcept
  SetFunction
  SetIntVector
  SetSR
  SetSignal
  SetTaskPri
  Signal
  StackSwap
  SumKickData
  SumLibrary
  SuperState
  Supervisor
  TypeOfMem
  UserState
  Vacate
  Wait
  WaitIO
  WaitPort
Include
GuruMeditation
Docs » Autodocs » exec.library » CacheClearE

NAME

	CacheClearE - Cache clearing with extended control (V37)

SYNOPSIS

	CacheClearE(address,length,caches)
a0 d0 d1
void CacheClearE(APTR,ULONG,ULONG);

FUNCTION

	Flush out the contents of the CPU instruction and/or data caches.
If dirty data cache lines are present, push them to memory first.
Motorola CPUs have separate instruction and data caches. A data
write does not update the instruction cache. If an instruction is
written to memory or modified, the old instruction may still exist
in the cache. Before attempting to execute the code, a flush of
the instruction cache is required.
For most systems, the data cache is not updated by Direct Memory
Access (DMA), or if some external factor changes shared memory.
Caches must be cleared after *any* operation that could cause
invalid or stale data. The most common cases are DMA and modifying
instructions using the processor.
Some examples:
Self modifying code
Building Jump tables
Run-time code patches
Relocating code for use at different addresses.
Loading code from disk

INPUTS

	address - Address to start the operation.  This may be rounded
due to hardware granularity.
length - Length of area to be cleared, or $FFFFFFFF to indicate all
addresses should be cleared.
caches - Bit flags to indicate what caches to affect. The current
supported flags are:
CACRF_ClearI ;Clear instruction cache
CACRF_ClearD ;Clear data cache
All other bits are reserved for future definition.

NOTES

	On systems with a copyback mode cache, any dirty data is pushed
to memory as a part of this operation.
Regardless of the length given, the function will determine the most
efficient way to implement the operation. For some cache systems,
including the 68030, the overhead partially clearing a cache is often
too great. The entire cache may be cleared.
For all current Amiga models, Chip memory is set with Instruction
caching enabled, data caching disabled. This prevents coherency
conflicts with the blitter or other custom chip DMA. Custom chip
registers are marked as non-cacheable by the hardware.
The system takes care of appropriately flushing the caches for normal
operations. The instruction cache is cleared by all calls that
modify instructions, including LoadSeg(), MakeLibrary() and
SetFunction().

SEE ALSO

"exec/execbase.i", CacheControl(), CacheClearU()

Comments

Name:
E-mail: Use this if you want a message if you get a response, will not be shown.
Comment:
Select correct short for:

Razor 1911

AFL
PDX
SPB
RZR

Comments:

$VER: d0.se 1.14 Copyright © 2011-2020 Tobias Geijersson support at d0 dot se