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-.\" Written by Ralf Baechle (ralf@waldorf-gmbh.de),
-.\" Copyright (c) 1994, 1995 Waldorf GMBH
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.TH cacheflush 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-cacheflush \- flush contents of instruction and/or data cache
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/cachectl.h>
-.P
-.BI "int cacheflush(void " addr [. nbytes "], int "nbytes ", int "cache );
-.fi
-.P
-.IR Note :
-On some architectures,
-there is no glibc wrapper for this system call; see NOTES.
-.SH DESCRIPTION
-.BR cacheflush ()
-flushes the contents of the indicated cache(s) for the
-user addresses in the range
-.I addr
-to
-.IR (addr+nbytes\-1) .
-.I cache
-may be one of:
-.TP
-.B ICACHE
-Flush the instruction cache.
-.TP
-.B DCACHE
-Write back to memory and invalidate the affected valid cache lines.
-.TP
-.B BCACHE
-Same as
-.BR (ICACHE|DCACHE) .
-.SH RETURN VALUE
-.BR cacheflush ()
-returns 0 on success.
-On error, it returns \-1 and sets
-.I errno
-to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-Some or all of the address range
-.I addr
-to
-.I (addr+nbytes\-1)
-is not accessible.
-.TP
-.B EINVAL
-.I cache
-is not one of
-.BR ICACHE ,
-.BR DCACHE ,
-or
-.B BCACHE
-(but see BUGS).
-.SH VERSIONS
-.BR cacheflush ()
-should not be used in programs intended to be portable.
-On Linux, this call first appeared on the MIPS architecture,
-but nowadays, Linux provides a
-.BR cacheflush ()
-system call on some other architectures, but with different arguments.
-.SS Architecture-specific variants
-glibc provides a wrapper for this system call,
-with the prototype shown in SYNOPSIS,
-for the following architectures:
-ARC, CSKY, MIPS, and NIOS2.
-.P
-On some other architectures,
-Linux provides this system call, with different arguments:
-.TP
-M68K:
-.nf
-.BI "int cacheflush(unsigned long " addr ", int " scope ", int " cache ,
-.BI "               unsigned long " len );
-.fi
-.TP
-SH:
-.nf
-.BI "int cacheflush(unsigned long " addr ", unsigned long " len ", int " op );
-.fi
-.TP
-NDS32:
-.nf
-.BI "int cacheflush(unsigned int " start ", unsigned int " end ", int " cache );
-.fi
-.P
-On the above architectures,
-glibc does not provide a wrapper for this system call; call it using
-.BR syscall (2).
-.SS GCC alternative
-Unless you need the finer grained control that this system call provides,
-you probably want to use the GCC built-in function
-.BR __builtin___clear_cache (),
-which provides a portable interface
-across platforms supported by GCC and compatible compilers:
-.P
-.in +4n
-.EX
-.BI "void __builtin___clear_cache(void *" begin ", void *" end );
-.EE
-.in
-.P
-On platforms that don't require instruction cache flushes,
-.BR __builtin___clear_cache ()
-has no effect.
-.P
-.IR Note :
-On some GCC-compatible compilers,
-the prototype for this built-in function uses
-.I char *
-instead of
-.I void *
-for the parameters.
-.SH STANDARDS
-Historically, this system call was available on all MIPS UNIX variants
-including RISC/os, IRIX, Ultrix, NetBSD, OpenBSD, and FreeBSD
-(and also on some non-UNIX MIPS operating systems), so that
-the existence of this call in MIPS operating systems is a de-facto
-standard.
-.SH BUGS
-Linux kernels older than Linux 2.6.11 ignore the
-.I addr
-and
-.I nbytes
-arguments, making this function fairly expensive.
-Therefore, the whole cache is always flushed.
-.P
-This function always behaves as if
-.B BCACHE
-has been passed for the
-.I cache
-argument and does not do any error checking on the
-.I cache
-argument.