NAME
arm_sync_icache —
clean the CPU data cache and flush the
CPU instruction cache
SYNOPSIS
#include
<machine/sysarch.h>
int
arm_sync_icache(u_int
addr, int len);
DESCRIPTION
arm_sync_icache()
will make sure that all the entries in the processor instruction cache are
synchronized with main memory and that any data in a write back cache has
been cleaned. Some ARM processors (e.g. SA110) have separate instruction and
data caches, thus any dynamically generated or modified code needs to be
written back from any data caches to main memory and the instruction cache
needs to be synchronized with main memory.
On such processors,
arm_sync_icache()
will clean the data cache and invalidate the processor instruction cache to
force reloading from main memory. On processors that have a shared
instruction and data cache and have a write through cache (e.g. ARM6), no
action needs to be taken.
The routine takes a start address addr and a length len to describe the area of memory that needs to be cleaned and synchronized.
ERRORS
arm_sync_icache() will never fail so will
always return 0.
REFERENCES
StrongARM Data Sheet