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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
#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: 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.
These system calls are available since Linux 3.19.
This Linux-specific system call is available only on the s390
architecture. The required PCI support is available beginning
with System z EC12.
syscall(2)
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/.
Linux Programmer's Manual 2021-03-22 S390_PCI_MMIO_WRITE(2)
Pages that refer to this page: syscalls(2)
Copyright and license for this manual page
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