передавать данные в / из страницы памяти PCI MMIO (transfer data to/from PCI MMIO memory page)
Имя (Name)
s390_pci_mmio_write, s390_pci_mmio_read - transfer data to/from
PCI MMIO memory page
Синопсис (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, 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).
Описание (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.
Возвращаемое значение (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.
Ошибки (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.
Версии (Versions)
These system calls are available since Linux 3.19.
Стандарты (Conforming to)
This Linux-specific system call is available only on the s390
architecture. The required PCI support is available beginning
with System z EC12.
Смотри также (See also)
syscall(2)
