# DC_UnlockdownAll

## Syntax

      #include <nitro/os.h>

      void DC_UnlockdownAll( void );

## Arguments

None.

## Return Values

None.

## Description

Instruction cache can be locked with `DC_LockdownRange()`, which prevents the cache from being deleted. `DC_UnlockdownAll` releases the data cache to be deleted when the cache is replaced. The function releases all regions locked with `DC_LockdownRange()`.

## Internal Operation

Operates registers 7 and 9 of the system control coprocessor.

## See Also

`DC_LockdownRange,DC_Unlockdown`

## Revision History

2005/01/21 Initial version.

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