NAME

segflush − flush instruction and data caches

SYNOPSIS

­#include <u.h>
­#include <libc.h>

intsegflush(void ∗va, ulong len)

DESCRIPTION

­Segflush invalidates any instruction cache and writes back any data cache associated with pages contained in a segment.  All subsequent new pages in the segment will also be flushed when first referenced. 

­Va is an address within the segment to be flushed; it is rounded down to the nearest page boundary.  ­Len specifies the length in bytes of the memory to flush; va+len is rounded up to the nearest page boundary.  ­Segflush works correctly when the memory straddles multiple segments. 

Correct use of ­segflush depends on an understanding of the cache architecture of the specific machine. 

SOURCE

­/sys/src/libc/9syscall

SEE ALSO

segattach(2), segbrk(2)
/proc/∗/segment

DIAGNOSTICS

Sets errstr.

Plan 9  —  December 11, 1999