ddi_io_get8(9F) Kernel Functions for Drivers ddi_io_get8(9F)NAME
ddi_io_get8, ddi_io_get16, ddi_io_get32, ddi_io_getb, ddi_io_getw,
ddi_io_getl - 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
Solaris DDI specific (Solaris DDI).
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 char‐
acteristics.
CONTEXT
These functions can be called from user, kernel, or interrupt context.
SEE ALSOisa(4), ddi_io_put8(9F), ddi_io_rep_get8(9F), ddi_io_rep_put8(9F),
ddi_regs_map_free(9F), ddi_regs_map_setup(9F), ddi_device_acc_attr(9S)NOTES
For drivers using these functions, it may not be easy to maintain a
single source to support devices with multiple bus versions. For
example, devices may offer I/O space in ISA bus (see isa(4)) but mem‐
ory space only in PCI local bus. This is especially true in instruc‐
tion set architectures such as x86 where accesses to the memory and
I/O space are different.
The functions described in this manual page previously used symbolic
names which specified their data access size; the function names have
been changed so they now specify a fixed-width data size. See the
following table for the new name equivalents:
┌──────────────────────────────────────────────────────────────┐
│Previous Name New Name │
│ddi_io_getb ddi_io_get8 │
│ddi_io_getw ddi_io_get16 │
│ddi_io_getl ddi_io_get32 │
└──────────────────────────────────────────────────────────────┘
SunOS 5.10 29 June 1999 ddi_io_get8(9F)
