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