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s390_pci_mmio_write(2) — Linux manual page

s390_pci_mmio_write(2)     System Calls Manuals390_pci_mmio_write(2)

NAME        top

       s390_pci_mmio_write, s390_pci_mmio_read - transfer data to/from       PCI MMIO memory page

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <sys/syscall.h>/* Definition ofSYS_*constants */#include <unistd.h>int syscall(size_t length;SYS_s390_pci_mmio_write, unsigned longmmio_addr,const voiduser_buffer[length], size_tlength);int syscall(size_t length;SYS_s390_pci_mmio_read, unsigned longmmio_addr,voiduser_buffer[length], size_tlength);Note: glibc provides no wrappers for these system calls,       necessitating the use ofsyscall(2).

DESCRIPTION        top

       Thes390_pci_mmio_write() system call writeslength bytes of data       from the user-space bufferuser_buffer to the PCI MMIO memory       location specified bymmio_addr.  Thes390_pci_mmio_read() system       call readslength bytes of data from the PCI MMIO memory location       specified bymmio_addr to the user-space bufferuser_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 bymmio_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.  Thelength       value cannot be greater than the system page size.

RETURN VALUE        top

       On success,s390_pci_mmio_write() ands390_pci_mmio_read() return       0.  On failure, -1 is returned anderrno is set to indicate the       error.

ERRORS        top

EFAULTThe address inmmio_addr is invalid.EFAULTuser_buffer does not point to a valid location in the              caller's address space.EINVALInvalidlength argument.ENODEVPCI support is not enabled.ENOMEMInsufficient memory.

STANDARDS        top

       Linux on s390.

HISTORY        top

       Linux 3.19.  System z EC12.

SEE ALSO        top

syscall(2)

COLOPHON        top

       This page is part of theman-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       for this manual page, see       ⟨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       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-06-28s390_pci_mmio_write(2)

Pages that refer to this page:syscalls(2)

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