cacheflush(3)

NAME

cacheflush, _flush_cache — CPU cache synchronization functions

SYNOPSIS

#include <machine/sysarch.h>

int
cacheflush(void *addr, int nbytes, int cache);

int
_flush_cache(char *addr, int nbytes, int cache);

DESCRIPTION

cacheflush() allows a process to synchronize the contents of the processor caches with main memory. Since MIPS processors have separate instruction and data caches, this function allows for dynamically generated code to run correctly.

cacheflush operates on a contiguous memory range in the current process address space, starting at address addr and nbytes bytes long. The caches to be synchronized are specified in the cache argument with one of the following values:

_flush_cache is an alias for the cacheflush function.

RETURN VALUES

Upon successful completion, cacheflush returns zero. Otherwise, a value of -1 is returned and errno is set to indicate the error.

ERRORS

cacheflush will fail if:

[EFAULT]

The address range specified by addr and nbytes is not part of the process allocated address space.

[EINVAL]

cache is not valid.