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s390_pci_mmio_write.2: New page for s390 s390_pci_mmio_write() and s390_pci_mmio_read()
New manual page for the new PCI MMIO memory access system calls, s390_pci_mmio_write() and s390_pci_mmio_read(), added for the s390 platform. Signed-off-by: Alexey Ishchuk <aishchuk@linux.vnet.ibm.com> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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.\" Copyright (c) IBM Corp. 2015
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.\" Author: Alexey Ishchuk <aishchuk@linux.vnet.ibm.com>
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.\"
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.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, see
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.\" <http://www.gnu.org/licenses/>.
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.\" %%%LICENSE_END
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.\"
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.TH S390_PCI_MMIO_WRITE 2 2015-01-15 "Linux Programmer's Manual"
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.SH NAME
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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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.SH SYNOPSIS
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.nf
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.B #include <asm/unistd.h>
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.BI "int s390_pci_mmio_write(unsigned long " mmio_addr ",
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.BI " void *" user_buffer ",
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.BI " size_t " length ");
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.br
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.BI "int s390_pci_mmio_read(unsigned long " mmio_addr ",
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.BI " void *" user_buffer ",
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.BI " size_t " length ");
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.fi
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.SH DESCRIPTION
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The
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.BR s390_pci_mmio_write ()
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system call writes data of length
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.IR length
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from the user space buffer
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.IR user_buffer
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to a PCI MMIO memory location.
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The
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.BR s390_pci_mmio_read ()
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system call reads data from a PCI MMIO memory location
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to the user space buffer
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.IR user_buffer
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of
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.IR length
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bytes size.
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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 the user space on the Linux on System z
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platform.
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The address specified by the
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.IR mmio_addr
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parameter must belong to a PCI MMIO memory page mapping in the user
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address space, and the data being written or read must not cross a
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page boundary. The
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.IR length
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parameter value cannot be greater than the page size.
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.SH RETURN VALUE
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On success,
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.BR s390_pci_mmio_write ()
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and
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.BR s390_pci_mmio_read ()
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return 0.
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On error, \-1 is returned and
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.IR errno
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is set to one of the error codes listed below.
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.SH ERRORS
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.TP
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.B ENODEV
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PCI support is not enabled.
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.TP
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.B ENOMEM
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Insufficient memory.
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.TP
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.B EFAULT
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Invalid address was specified.
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.TP
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.B EINVAL
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Invalid parameter value.
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.SH VERSIONS
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These system calls are available since Linux 3.19.
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.SH CONFORMING TO
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This Linux-specific system call is available only on the s390
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architecture. The required PCI support is available beginning with
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System z EC12.
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.SH NOTES
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Glibc does not provide a wrapper for this system call, use
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.BR syscall (2)
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to call it.
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.SH SEE ALSO
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.BR syscall (2)
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