# IC_UnlockdownAll

## C Specification

      #include <nitro/os.h>

      void IC_UnlockdownAll( void );

## Arguments

None.

## Return Values

None.

## Description

Instruction cache can be locked with `IC_LockdownRange`, which prevents the cache from being deleted. `IC_Unlockdown` releases the instruction cache to be deleted when the cache is replaced. The function releases all regions locked with `IC_LockdownRange`.

## Internal Operation

Operates registers 7 and 9 of the system control coprocessor.

## See Also

`IC_LockdownRange,IC_Unlockdown`

## Revision History

01/21/2005 Initial Version