Name
s390_pci_mmio_write, s390_pci_mmio_read — transfer data to/from PCI MMIO memory page
Synopsis
#include <sys/syscall.h> /* Definition of SYS_* constants */ #include <unistd.h>
int
syscall( |
SYS_s390_pci_mmio_write, |
| unsigned long mmio_addr, | |
| const void *user_buffer, | |
size_t length); |
int
syscall( |
SYS_s390_pci_mmio_read, |
| unsigned long mmio_addr, | |
| void *user_buffer, | |
size_t length); |
![[Note]](../stylesheet/note.png) |
Note |
|---|---|
| glibc provides no wrappers for these system calls, necessitating the use of |
.BR syscall (2).
DESCRIPTION
The s390_pci_mmio_write()
system call writes length bytes of data from the
user-space buffer user_buffer to the PCI MMIO
memory location specified by mmio_addr. The s390_pci_mmio_read() system call reads
length bytes of data
from the PCI MMIO memory location specified by mmio_addr to the user-space
buffer user_buffer.
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 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 length
value cannot be greater than the system page size.
RETURN VALUE
On success, s390_pci_mmio_write() and s390_pci_mmio_read() return 0. On failure,
−1 is returned and errno
is set to indicate the error.
ERRORS
- EFAULT
-
The address in
mmio_addris invalid. - EFAULT
-
user_bufferdoes not point to a valid location in the caller's address space. - EINVAL
-
Invalid
lengthargument. - ENODEV
-
PCI support is not enabled.
- ENOMEM
-
Insufficient memory.
CONFORMING TO
This Linux-specific system call is available only on the s390 architecture. The required PCI support is available beginning with System z EC12.
COLOPHON
This page is part of release 5.13 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright (c) IBM Corp. 2015 Author: Alexey Ishchuk <aishchuklinux.vnet.ibm.com> %%%LICENSE_START(GPLv2+_DOC_FULL) This is free documentation; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU General Public License's references to "object code" and "executables" are to be interpreted as the output of any document formatting or typesetting system, including intermediate and printed output. This manual is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this manual; if not, see <http://www.gnu.org/licenses/>. %%%LICENSE_END |