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Cache (OAL) (Compact 2013)

  • Article

3/26/2014

Compact 2013 is designed to make optimum use of hardware caches to enable high performance. Hardware caches are often arranged in levels, such as small-size-but-fast level 1 caches and larger-but-slower level 2 caches. The OAL cache code is responsible for initializing and managing all these cache. The header file that defines the OAL cache module interface is %_WINCEROOT%\Platform\Common\Src\Inc\oal_cache.h. The cache functions are linked into oal.lib.

The cache code is often divided into multiple files, some of which are in assembly language. The following are typical cache code locations:

  • %_WINCEROOT%\Platform\Common\Src\Common\Cache
  • %_WINCEROOT%\Platform\Common\Src\SOC\<SOC Name>\OAL\Cache
  • %_WINCEROOT%\Platform\Common\Src\<CPU Family>\Common\Cache
  • %_WINCEROOT%\Platform\Common\Src\<CPU Family>\<CPU Name>\Cache

The following table lists the main cache functions; however, for more information about cache functions, see Cache Reference. The common cache code that is provided with Windows Embedded Compact contains CPU-family-specific implementations that you may be able to use with little modification if your hardware platform uses a CPU from the same family.

Purpose

Function name

Initializes the cache.

OALCacheGlobalsInit

Gets cache information.

OALIoCtlHalGetCacheInfo (OEMIoControl)

Cleans, flushes, or discards cache lines as requested. The primary routine called by the kernel to perform all cache operations is OEMCacheRangeFlush.

OEMCacheRangeFlush, OALCleanDCache, OALCleanDCacheLines

Clears the translation look-aside buffers (TLB).

OALClearDTLB, OALClearITLB

Flushes the cache.

OALFlushDCache, OALFlushDCacheLines, OALFlushICache, OALFlushICacheLines

See Also

Concepts

OAL Code Overview