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OpenSolaris 2009.06 - man page for sysbus (opensolaris section 4)

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sysbus(4)				   File Formats 				sysbus(4)

       sysbus, isa - device tree properties for ISA bus device drivers

       Solaris	for x86 supports  the ISA bus as the system bus. Drivers for devices on this buse
       use the device tree built by the booting system to retrieve the necessary system resources
       used by the driver. These resources include device I/O port addresses, any interrupt capa-
       bilities  that the device can have, any DMA channels it can require, and any memory-mapped
       addresses it can occupy.

       Configuration  files for ISA device drivers are only necessary to describe properties used
       by a particular driver that are not part of the standard properties found  in  the  device
       tree. See driver.conf(4) for further details of configuration file syntax.

       The  ISA  nexus drivers all belong to class sysbus. All bus drivers of class sysbus recog-
       nize the following properties:

       interrupts      An arbitrary-length array where each element of	the  array  represents	a
		       hardware  interrupt  (IRQ)  that  is used by the device.  In general, this
		       array only has one entry unless a particular device  uses  more	than  one

		       Solaris defaults all ISA interrupts to IPL 5.  This interrupt priority can
		       be overridden by placing an interrupt-priorities property in a .conf  file
		       for the driver. Each entry in the array of integers for the interrupt-pri-
		       orities property is matched one-to-one with the elements in the interrupts
		       property  to  specify  the  IPL	value that is used by the system for this
		       interrupt in this driver. This is the priority that this  device's  inter-
		       rupt handler receives relative to the interrupt handlers of other drivers.
		       The priority is an integer from	1 to 16. Generally, disks are assigned	a
		       priority of 5, while mice and printers are lower, and serial communication
		       devices are higher, typically 7. 10 is reserved by the system and must not
		       be used.  Priorities 11 and greater are high level priorities and are gen-
		       erally not recommended (see  ddi_intr_hilevel(9F)).

		       The driver can refer  to  the  elements	of  this  array  by  index  using
		       ddi_add_intr(9F). The index into the array is passed as the  inumber argu-
		       ment of ddi_add_intr().

		       Only devices that generate interrupts have an interrupts property.

       reg	       An arbitrary-length array where each element of the array  consists  of	a
		       3-tuple	of  integers.	Each  array element describes a contiguous memory
		       address range associated with the device on the bus.

		       The first integer of the tuple specifies the memory type,  0  specifies	a
		       memory  range  and  1 specifies an I/O range. The second integer specifies
		       the base address of the memory range. The third integer	of  each  3-tuple
		       specifies  the size, in bytes, of the mappable region.

		       The driver can refer to the elements of this array by index, and construct
		       kernel mappings to these addresses using ddi_map_regs(9F). The index  into
		       the array is passed as the  rnumber argument of ddi_map_regs().

		       All  sysbus devices have reg properties.  The first tuple of this property
		       is used to construct the address part of the device name under	/devices.
		       In  the	case  of  Plug and Play ISA devices, the first tuple is a special
		       tuple that does not denote a memory range, but is used by the system  only
		       to  create the address part of the device name.	This special tuple can be
		       recognized by determining if the top bit of the first integer is set to	a

		       The order of the tuples in the reg property is determined by the boot sys-
		       tem probe code and depends  on  the  characteristics  of  each  particular
		       device.	 However,  the	reg  property maintains the same order of entries
		       from system boot to system boot.  The recommended way to determine the reg
		       property  for  a particular device is to use the prtconf(1M) command after
		       installing the particular device.  The output of the prtconf  command  can
		       be examined to determine the reg property for any installed device.

		       You can use the ddi_get* and ddi_put* family of functions to access regis-
		       ter space from a high-level interrupt context.

       dma-channels    A list of integers that specifies the DMA channels used	by  this  device.
		       Only devices that use DMA channels have a dma-channels property.

       See attributes(5) for descriptions of the following attributes:

       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Architecture		     |x86			   |

       prtconf(1M),	 driver.conf(4),      scsi(4),	    attributes(5),	ddi_add_intr(9F),
       ddi_intr_hilevel(9F), ddi_map_regs(9F), ddi_prop_op(9F)

       Writing Device Drivers

SunOS 5.11				   18 Nov 2004					sysbus(4)
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