'\" t
.\"     Title: arch_phys_wc_add
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: Hardware Interfaces
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "ARCH_PHYS_WC_ADD" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "Hardware Interfaces"
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.SH "NAME"
arch_phys_wc_add \- add a WC MTRR and handle errors if PAT is unavailable
.SH "SYNOPSIS"
.HP \w'int\ arch_phys_wc_add('u
.BI "int arch_phys_wc_add(unsigned\ long\ " "base" ", unsigned\ long\ " "size" ");"
.SH "ARGUMENTS"
.PP
\fIbase\fR
.RS 4
Physical base address
.RE
.PP
\fIsize\fR
.RS 4
Size of region
.RE
.SH "DESCRIPTION"
.PP
If PAT is available, this does nothing\&. If PAT is unavailable, it attempts to add a WC MTRR covering size bytes starting at base and logs an error if this fails\&.
.PP
Drivers must store the return value to pass to mtrr_del_wc_if_needed, but drivers should not try to interpret that return value\&.
.SH "COPYRIGHT"
.br