NAME

     cacheflush - flush contents of instruction and/or data cache

SYNOPSIS

     #include <asm/cachectl.h>

     int cacheflush(char *addr, int nbytes, int cache

DESCRIPTION

     cacheflush flushes contents of indicated cache(s)  for  user
     addresses in the range addr to (addr+nbytes-1). Cache may be
     one of:

     ICACHE
          Flush the instruction cache.

     DCACHE
          Write back to memory and invalidate the affected  valid
          cache lines.

     BCACHE
          Same as (ICACHE|DCACHE).

RETURN VALUE

     cacheflush returns 0 on success or -1 on  error.  If  errors
     are detected, errno will indicate the error.

ERRORS

     EINVAL
          cache parameter  is  not  one  of  ICACHE,  DCACHE,  or
          BCACHE.

     EFAULT
          Some or all of the address range addr to  (addr+nbytes-
          1) is not accessible.

BUGS

     The current  implementation  ignores  the  addr  and  nbytes
     parameters.  Therefore always the whole cache is flushed.

NOTE

     This system call is only available on  MIPS  based  systems.
     It should not be used in programs intended to be portable.