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