171 lines
3.9 KiB
HTML
171 lines
3.9 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of S390_PCI_MMIO_WRITE</TITLE>
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</HEAD><BODY>
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<H1>S390_PCI_MMIO_WRITE</H1>
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Section: System Calls (2)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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s390_pci_mmio_write, s390_pci_mmio_read - transfer data to/from PCI
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MMIO memory page
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/asm/unistd.h">asm/unistd.h</A>></B>
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<B>int s390_pci_mmio_write(unsigned long </B><I>mmio_addr</I><B>,</B>
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<B> void *</B><I>user_buffer</I><B>, size_t </B><I>length</I><B>);</B>
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<B>int s390_pci_mmio_read(unsigned long </B><I>mmio_addr</I><B>,</B>
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<B> void *</B><I>user_buffer</I><B>, size_t </B><I>length</I><B>);</B>
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The
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<B>s390_pci_mmio_write</B>()
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system call writes
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<I>length</I>
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bytes of data from the user-space buffer
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<I>user_buffer</I>
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to the PCI MMIO memory location specified by
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<I>mmio_addr</I>.
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The
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<B>s390_pci_mmio_read</B>()
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system call reads
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<I>length</I>
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bytes of
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data from the PCI MMIO memory location specified by
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<I>mmio_addr</I>
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to the user-space buffer
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<I>user_buffer</I>.
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<P>
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These system calls must be used instead of the simple assignment
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or data-transfer operations that are used to access the PCI MMIO
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memory areas mapped to user space on the Linux System z platform.
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The address specified by
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<I>mmio_addr</I>
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must belong to a PCI MMIO memory page mapping in the caller's address space,
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and the data being written or read must not cross a page boundary.
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The
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<I>length</I>
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value cannot be greater than the system page size.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success,
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<B>s390_pci_mmio_write</B>()
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and
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<B>s390_pci_mmio_read</B>()
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return 0.
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On error, -1 is returned and
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<I>errno</I>
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is set to one of the error codes listed below.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<DL COMPACT>
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<DT id="1"><B>EFAULT</B>
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<DD>
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The address in
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<I>mmio_addr</I>
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is invalid.
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<DT id="2"><B>EFAULT</B>
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<DD>
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<I>user_buffer</I>
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does not point to a valid location in the caller's address space.
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<DT id="3"><B>EINVAL</B>
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<DD>
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Invalid
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<I>length</I>
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argument.
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<DT id="4"><B>ENODEV</B>
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<DD>
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PCI support is not enabled.
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<DT id="5"><B>ENOMEM</B>
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<DD>
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Insufficient memory.
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</DL>
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<A NAME="lbAG"> </A>
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<H2>VERSIONS</H2>
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These system calls are available since Linux 3.19.
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<A NAME="lbAH"> </A>
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<H2>CONFORMING TO</H2>
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This Linux-specific system call is available only on the s390 architecture.
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The required PCI support is available beginning with System z EC12.
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<A NAME="lbAI"> </A>
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<H2>NOTES</H2>
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Glibc does not provide a wrapper for this system call, use
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<B><A HREF="/cgi-bin/man/man2html?2+syscall">syscall</A></B>(2)
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to call it.
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<A NAME="lbAJ"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?2+syscall">syscall</A></B>(2)
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<A NAME="lbAK"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="6"><A HREF="#lbAB">NAME</A><DD>
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<DT id="7"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="8"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="9"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="10"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="11"><A HREF="#lbAG">VERSIONS</A><DD>
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<DT id="12"><A HREF="#lbAH">CONFORMING TO</A><DD>
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<DT id="13"><A HREF="#lbAI">NOTES</A><DD>
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<DT id="14"><A HREF="#lbAJ">SEE ALSO</A><DD>
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<DT id="15"><A HREF="#lbAK">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:34 GMT, March 31, 2021
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</BODY>
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