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- .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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