'\" t
.\"     Title: pci_iomap
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: April 2019
.\"    Manual: Public Functions Provided
.\"    Source: Kernel Hackers Manual 4.9.168
.\"  Language: English
.\"
.TH "PCI_IOMAP" "9" "April 2019" "Kernel Hackers Manual 4\&.9\&." "Public Functions Provided"
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.SH "NAME"
pci_iomap \- create a virtual mapping cookie for a PCI BAR
.SH "SYNOPSIS"
.HP \w'void\ __iomem\ *\ pci_iomap('u
.BI "void __iomem * pci_iomap(struct\ pci_dev\ *\ " "dev" ", int\ " "bar" ", unsigned\ long\ " "maxlen" ");"
.SH "ARGUMENTS"
.PP
\fIdev\fR
.RS 4
PCI device that owns the BAR
.RE
.PP
\fIbar\fR
.RS 4
BAR number
.RE
.PP
\fImaxlen\fR
.RS 4
length of the memory to map
.RE
.SH "DESCRIPTION"
.PP
Using this function you will get a __iomem address to your device BAR\&. You can access it using ioread*() and iowrite*()\&. These functions hide the details if this is a MMIO or PIO address space and will just do what you expect from them in the correct way\&.
.PP
\fImaxlen\fR
specifies the maximum length to map\&. If you want to get access to the complete BAR without checking for its length first, pass
\fB0\fR
here\&.
.SH "AUTHORS"
.PP
\fBMatthew Wilcox\fR <\&matthew@wil.cx\&>
.RS 4
Author.
.RE
.PP
\fBAlan Cox\fR <\&alan@lxorguk.ukuu.org.uk\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br