diff options
Diffstat (limited to 'man2/cacheflush.2')
| -rw-r--r-- | man2/cacheflush.2 | 61 |
1 files changed, 59 insertions, 2 deletions
diff --git a/man2/cacheflush.2 b/man2/cacheflush.2 index c687db242..d445befd8 100644 --- a/man2/cacheflush.2 +++ b/man2/cacheflush.2 @@ -22,7 +22,7 @@ .\" <http://www.gnu.org/licenses/>. .\" %%%LICENSE_END .\" -.TH CACHEFLUSH 2 2017-09-15 "Linux" "Linux Programmer's Manual" +.TH CACHEFLUSH 2 2020-12-21 "Linux" "Linux Programmer's Manual" .SH NAME cacheflush \- flush contents of instruction and/or data cache .SH SYNOPSIS @@ -31,6 +31,10 @@ cacheflush \- flush contents of instruction and/or data cache .PP .BI "int cacheflush(char *" addr ", int "nbytes ", int "cache ); .fi +.PP +.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 @@ -86,6 +90,59 @@ 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. +.SH NOTES +.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. +.PP +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 +.PP +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: +.PP +.in +4n +.EX +.BI "void __builtin___clear_cache(void *" begin ", void *" end ); +.EE +.in +.PP +On platforms that don't require instruction cache flushes, +.BR __builtin___clear_cache () +has no effect. +.PP +.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 BUGS Linux kernels older than version 2.6.11 ignore the .I addr @@ -102,7 +159,7 @@ argument and does not do any error checking on the .I cache argument. .SH COLOPHON -This page is part of release 5.09 of the Linux +This page is part of release 5.10 of the Linux .I man-pages project. A description of the project, |