ultrix man page for cachectl

cachectl(2)							System Calls Manual						       cachectl(2)

Name
       cachectl - mark pages cacheable or uncacheable

Syntax
       #include <mips/cachectl.h>

       cachectl(addr, nbytes, op)
       char *addr;
       int nbytes, op;

Description
       The system call allows a process to make ranges of its address space cacheable or uncacheable.  Initially, a process's entire address space
       is cacheable.

       The op parameter is one of the following:

       CACHEABLE	   Make the indicated pages cacheable.

       UNCACHEABLE	   Make the indicated pages uncacheable.

       The arguments CACHEABLE and UNCACHEABLE affect the address range indicated by the addr and  nbytes  parameters.	 The  addr  must  be  page
       aligned, and nbytes must be a multiple of the page size.

       Changing a page from UNCACHEABLE state to CACHEABLE state causes both the instruction and data caches to be flushed.

Return Values
       The system call returns 0 on success. If errors are detected, the system call returns -1 with the error cause indicated in errno.

Diagnostics
       [EFAULT]       Some or all of the address range addr to (addr+nbytes-1) are not accessible.

       [EINVAL]       The op parameter is not CACHEABLE or UNCACHEABLE.

       [EINVAL]       The addr parameter is not page aligned, or the nbytes parameter is not a multiple of pagesize.

4th Berkeley Distribution					       RISC							       cachectl(2)