illumos: manual page: ddi_io

DDI_IO_GET8(9F) Kernel Functions for Drivers DDI_IO_GET8(9F)

NAME

ddi_io_get8, ddi_io_get16, ddi_io_get32 - read data from the mapped
device register in I/O space

SYNOPSIS

#include <sys/ddi.h>
#include <sys/sunddi.h>

uint8_t ddi_io_get8(ddi_acc_handle_t handle, uint8_t *dev_addr);

uint16_t ddi_io_get16(ddi_acc_handle_t handle, uint16_t *dev_addr);

uint32_t ddi_io_get32(ddi_acc_handle_t handle, uint32_t *dev_addr);

INTERFACE LEVEL

illumos DDI specific (illumos DDI). The ddi_io_get8(), ddi_io_get16(),
ddi_io_get32(), ddi_io_getb(), ddi_io_getl(), and ddi_io_getw() functions
are obsolete. The ddi_get8(9F) function replaces ddi_io_get8(). The
ddi_get16(9F) function replaces ddi_io_get16(). The ddi_get32(9F)
function replaces ddi_io_get32().

PARAMETERS

handle
Data access handle returned from setup calls, such as
ddi_regs_map_setup(9F).

dev_addr
Device address.

DESCRIPTION

These routines generate a read of various sizes from the device address,
dev_addr, in I/O space. The ddi_io_get8(), ddi_io_get16(), and
ddi_io_get32() functions read 8 bits, 16 bits, and 32 bits of data,
respectively, from the device address, dev_addr.

Each individual datum will automatically be translated to maintain a
consistent view between the host and the device based on the encoded
information in the data access handle. The translation may involve byte-
swapping if the host and the device have incompatible endian
characteristics.

CONTEXT

These functions can be called from user, kernel, or interrupt context.

ATTRIBUTES