NAME
segflush – flush instruction and data caches

SYNOPSIS
#include <u.h>
#include <libc.h>

int    segflush(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.
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