Linux cli command s390_pci_mmio_read

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command s390_pci_mmio_read and provides detailed information about the command s390_pci_mmio_read, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the s390_pci_mmio_read.

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NAME 🖥️ s390_pci_mmio_read 🖥️

transfer data to/from PCI MMIO memory page

LIBRARY

Standard C library (libc, -lc)

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[.length], size_t length);
int syscall(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).

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_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.

STANDARDS

Linux on s390.

HISTORY

Linux 3.19. System z EC12.

SEE ALSO

syscall(2)

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