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Full Discussion: Entry Points Routine
Top Forums Programming Entry Points Routine Post 29451 by Perderabo on Monday 7th of October 2002 08:42:16 AM
Old 10-07-2002
They are tables of entry points to device drivers. All drivers have entries in these tables. The index to the tables is called the major number. By convention, if a device has both a block and character device, the same major number is used for both tables.

For example, if you have a device:
dev_t x;

You can do something like:
(*bdevsw[major(x)].strategy)(bp);

to call the proper strategy routine for the given device. That's how the kernel gets the right driver for the right device.
 

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LEARN ABOUT OSF1

devswmgr

devswmgr(8)						      System Manager's Manual						       devswmgr(8)

NAME

       devswmgr - utility to manage the device switch database

SYNOPSIS

       /sbin/devswmgr [-option [parameter]]

OPTIONS

       Displays the following information about the device switch database:

	      Whether a device switch database was read from the primary file or from a backup file

	      The number of entries that are in the device switch table Displays the major numbers that have been reserved by all drivers, a named
	      driver, or an instance of a named driver.

	      A driver that requires more than one entry in the device switch table uses a unique instance number to reference each of its  device
	      switch  table  entries.	Displays  help	for  the devswmgr command.  Releases all the major numbers for a device driver if just the
	      driver name is specified.  Releases one major number for a device driver if the NAME and the INSTANCENUM of the  driver  are  speci-
	      fied.

DESCRIPTION

       The devswmgr command helps you manage the device switch table by displaying information about the devices drivers in the table.

       You  can  also  use  the  command  to  release device switch table entries.  Typically, you release the entries for a driver after you have
       unloaded the driver and do not plan to reload it later.	Releasing the entries frees them for use by other device drivers.

EXAMPLES

       The following example shows that a device switch table was loaded from the  primary  device  and  that  there  are  70  entries	in  it:  %
       /sbin/devswmgr -display Device switch information
	 device switch database read from primary file
	 device  switch  table has 70 entries The following example shows the major numbers in the device switch table that have been reserved for
       the driver named cam_disk: % /sbin/devswmgr -getnum driver=cam_disk

       Device switch reservation list

						 (*=entry in use)
		   driver name		   instance   major
	 -------------------------------   --------   -----
				cam_disk	  1	 8*

FILES

       The file that manages the device switch databases The primary device switch database file The backup device switch database file

SEE ALSO

       Commands: scsimgr(8)

																       devswmgr(8)
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