sunos man page for ddi_io_get8

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 ALSO
       isa(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 memory space only in	PCI local bus.	This is especially true in
       instruction 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)