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-.\" Copyright (c) IBM Corp. 2015
-.\" Author: Alexey Ishchuk <aishchuk@linux.vnet.ibm.com>
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.TH s390_pci_mmio_write 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-s390_pci_mmio_write, s390_pci_mmio_read \- transfer data to/from PCI
-MMIO memory page
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.BR "#include <sys/syscall.h>" "      /* Definition of " SYS_* " constants */"
-.B #include <unistd.h>
-.P
-.BI "int syscall(SYS_s390_pci_mmio_write, unsigned long " mmio_addr ,
-.BI "                       const void " user_buffer [. length "], \
-size_t " length );
-.BI "int syscall(SYS_s390_pci_mmio_read, unsigned long " mmio_addr ,
-.BI "                       void " user_buffer [. length "], size_t " length );
-.fi
-.P
-.IR Note :
-glibc provides no wrappers for these system calls,
-necessitating the use of
-.BR syscall (2).
-.SH DESCRIPTION
-The
-.BR s390_pci_mmio_write ()
-system call writes
-.I length
-bytes of data from the user-space buffer
-.I user_buffer
-to the PCI MMIO memory location specified by
-.IR mmio_addr .
-The
-.BR s390_pci_mmio_read ()
-system call reads
-.I length
-bytes of
-data from the PCI MMIO memory location specified by
-.I mmio_addr
-to the user-space buffer
-.IR user_buffer .
-.P
-These system calls must be used instead of the simple assignment
-or data-transfer operations that are used to access the PCI MMIO
-memory areas mapped to user space on the Linux System z platform.
-The address specified by
-.I mmio_addr
-must belong to a PCI MMIO memory page mapping in the caller's address space,
-and the data being written or read must not cross a page boundary.
-The
-.I length
-value cannot be greater than the system page size.
-.SH RETURN VALUE
-On success,
-.BR s390_pci_mmio_write ()
-and
-.BR s390_pci_mmio_read ()
-return 0.
-On failure, \-1 is returned and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-The address in
-.I mmio_addr
-is invalid.
-.TP
-.B EFAULT
-.I user_buffer
-does not point to a valid location in the caller's address space.
-.TP
-.B EINVAL
-Invalid
-.I length
-argument.
-.TP
-.B ENODEV
-PCI support is not enabled.
-.TP
-.B ENOMEM
-Insufficient memory.
-.SH STANDARDS
-Linux on s390.
-.SH HISTORY
-Linux 3.19.
-System z EC12.
-.SH SEE ALSO
-.BR syscall (2)