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man:s390_pci_mmio_write

S390_PCI_MMIO_WRITE(2) S390_PCI_MMIO_WRITE(2)

NAME

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

SYNOPSIS

     #include <asm/unistd.h>
     int s390_pci_mmio_write(unsigned long mmio_addr,
                             void *user_buffer, size_t length);
     int s390_pci_mmio_read(unsigned long mmio_addr,
                             void *user_buffer, size_t length);

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 spec-
     ified 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  error,  -1  is  returned and errno is set to one of the error codes
     listed below.

ERRORS

     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.

VERSIONS

     These system calls are available since Linux 3.19.

CONFORMING TO

     This Linux-specific system call is available only on the s390 architec-
     ture.  The required PCI support is available beginning  with  System  z
     EC12.

NOTES

     Glibc  does  not provide a wrapper for this system call, use syscall(2)
     to call it.

SEE ALSO

     syscall(2)

COLOPHON

     This page is part of release 4.16 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/.

Linux Programmer's Manual 2017-09-15 S390_PCI_MMIO_WRITE(2)

/data/webs/external/dokuwiki/data/pages/man/s390_pci_mmio_write.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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