TH SEGFLUSH 2
SH NAME
segflush \- flush instruction and data caches
SH SYNOPSIS
B #include <u.h>
br
B #include <libc.h>
PP
B
int     segflush(void *va, ulong len)
PP
SH DESCRIPTION
I 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.
PP
I Va
is an address within the segment to be flushed;
it is rounded down to the nearest page boundary.
I Len
specifies the length in bytes of
the memory to flush;
IB va + len
is rounded up to the nearest page boundary.
I Segflush
works correctly when the memory straddles multiple segments.
PP
Correct use of
I segflush
depends on an understanding of the cache architecture of the specific
machine.
SH SOURCE
B /sys/src/libc/9syscall
SH SEE ALSO
IR segattach (2),
IR segbrk (2)
br
BR /proc/*/segment
SH DIAGNOSTICS
Sets
IR errstr .

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