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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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s390_pci_mmio_write(2) System Calls Manual s390_pci_mmio_write(2)
s390_pci_mmio_write, s390_pci_mmio_read - transfer data to/from
PCI MMIO memory page
Standard C library (libc, -lc)
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
int syscall(size_t length;
SYS_s390_pci_mmio_write, unsigned long mmio_addr,
const void user_buffer[length], size_t length);
int syscall(size_t length;
SYS_s390_pci_mmio_read, unsigned long mmio_addr,
void user_buffer[length], size_t length);
Note: glibc provides no wrappers for these system calls,
necessitating the use of syscall(2).
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.
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.
EFAULT The address in mmio_addr is invalid.
EFAULT user_buffer does not point to a valid location in the
caller's address space.
EINVAL Invalid length argument.
ENODEV PCI support is not enabled.
ENOMEM Insufficient memory.
Linux on s390.
Linux 3.19. System z EC12.
syscall(2)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
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⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
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2025-08-11. If you discover any rendering problems in this HTML
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Linux man-pages 6.15 2025-06-28 s390_pci_mmio_write(2)
Pages that refer to this page: syscalls(2)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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