mirror of https://github.com/mkerrisk/man-pages
cacheflush.2: Document Architecture-specific variants
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -31,6 +31,10 @@ cacheflush \- flush contents of instruction and/or data cache
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.PP
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.BI "int cacheflush(char *" addr ", int "nbytes ", int "cache );
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.fi
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.PP
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.IR Note :
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On some architectures,
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there is no glibc wrapper for this system call; see NOTES.
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.SH DESCRIPTION
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.BR cacheflush ()
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flushes the contents of the indicated cache(s) for the
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@ -87,6 +91,44 @@ but nowadays, Linux provides a
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.BR cacheflush ()
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system call on some other architectures, but with different arguments.
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.SH NOTES
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.SS Architecture-specific variants
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Glibc provides a wrapper for this system call,
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with the prototype shown in SYNOPSIS,
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for the following architectures:
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ARC, CSKY, MIPS, and NIOS2.
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.PP
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On some other architectures,
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Linux provides this system call, with different arguments:
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.TP
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M68K:
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.PP
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.in +4n
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.EX
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.BI "int cacheflush(unsigned long " addr ", int " scope ", int " cache ,
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.BI " unsigned long " len );
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.EE
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.in
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.TP
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SH:
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.PP
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.in +4n
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.EX
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.BI "int cacheflush(unsigned long " addr ", unsigned long " len ", int " op );
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.EE
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.in
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.TP
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NDS32:
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.PP
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.in +4n
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.EX
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.BI "int cacheflush(unsigned int " start ", unsigned int " end ", int " cache );
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.EE
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.in
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.PP
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On the above architectures,
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glibc does not provide a wrapper for this system call; call it using
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.BR syscall (2).
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.SS GCC alternative
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Unless you need the finer grained control that this system call provides,
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you probably want to use the GCC built-in function
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.BR __builtin___clear_cache (),
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