forked from Minki/linux
49 lines
1.2 KiB
Plaintext
49 lines
1.2 KiB
Plaintext
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/*
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* File: Documentation/blackfin/cache-lock.txt
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* Based on:
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* Author:
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*
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* Created:
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* Description: This file contains the simple DMA Implementation for Blackfin
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*
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* Rev: $Id: cache-lock.txt 2384 2006-11-01 04:12:43Z magicyang $
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*
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* Modified:
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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*/
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How to lock your code in cache in uClinux/blackfin
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--------------------------------------------------
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There are only a few steps required to lock your code into the cache.
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Currently you can lock the code by Way.
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Below are the interface provided for locking the cache.
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1. cache_grab_lock(int Ways);
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This function grab the lock for locking your code into the cache specified
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by Ways.
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2. cache_lock(int Ways);
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This function should be called after your critical code has been executed.
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Once the critical code exits, the code is now loaded into the cache. This
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function locks the code into the cache.
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So, the example sequence will be:
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cache_grab_lock(WAY0_L); /* Grab the lock */
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critical_code(); /* Execute the code of interest */
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cache_lock(WAY0_L); /* Lock the cache */
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Where WAY0_L signifies WAY0 locking.
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