ps man page on Ultrix

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ps(4)				  Unsupported				 ps(4)

Name
       ps - Evans and Sutherland Picture System 2 graphics device interface

Syntax
       device ps0 at uba? csr 0172460 vector psintr

Description
       The  driver provides access to an Evans and Sutherland Picture System 2
       graphics device.	 Each minor device is a new PS2.  When the  device  is
       opened,	its interface registers are mapped, via virtual memory, into a
       user process's address space.  This allows the user process  very  high
       bandwidth to the device with no system call overhead.

       DMA  to	and  from  the PS2 is not supported. All read and write system
       calls will fail.	 All data is moved to and from the PS2 via  programmed
       I/O using the device's interface registers.

       Commands are fed to and from the driver using the following ioctls:

       PSIOGETADDR
	    Returns  the  virtual  address  through which the user process can
	    access the device's interface registers.

       PSIOAUTOREFRESH
	    Start auto refreshing the screen.  The argument is an  address  in
	    user  space	 where the following data resides.  The first longword
	    is a count of the number of	 static	 refresh  buffers.   The  next
	    count  longwords  are  the	addresses  in refresh memory where the
	    refresh buffers lie.  The driver will  cycle  thru	these  refresh
	    buffers displaying them one by one on the screen.

       PSIOAUTOMAP
	    Start  automatically passing the display file thru the matrix pro‐
	    cessor and into the refresh buffer.	 The argument is an address in
	    user  memory where the following data resides.  The first longword
	    is a count of the number of display files to operate on.  The next
	    count longwords are the address of these display files.  The final
	    longword is the address in refresh buffer memory where transformed
	    coordinates are to be placed if the driver is not in double buffer
	    mode (see below).

       PSIODOUBLEBUFFER
	    Cause the driver to double buffer the output from the map that  is
	    going  to  the refresh buffer.  The argument is again a user space
	    address where the real arguments are stored.  The  first  argument
	    is	the  starting  address	of refresh memory where the two double
	    buffers are located.  The second argument is the  length  of  each
	    double  buffer.  The refresh mechanism displays the current double
	    buffer, in addition to its static refresh lists,  when  in	double
	    buffer mode.

       PSIOSINGLEREFRESH
	    Single step the refresh process. That is, the driver does not con‐
	    tinually refresh the screen.

       PSIOSINGLEMAP
	    Single step the matrix process.  The driver does not automatically
	    feed display files thru the matrix unit.

       PSIOSINGLEBUFFER
	    Turn off double buffering.

       PSIOTIMEREFRESH
	    The	 argument  is  a  count of the number of refresh interrupts to
	    take before turning off the screen.	 This is used to do time expo‐
	    sures.

       PSIOWAITREFRESH
	    Suspend  the  user process until a refresh interrupt has occurred.
	    If	in  TIMEREFRESH	 mode,	suspend	 until	count  refreshes  have
	    occurred.

       PSIOSTOPREFRESH
	    Wait  for the next refresh, stop all refreshes, and then return to
	    user process.

       PSIOWAITMAP
	    Wait until a map done interrupt has occurred.

       PSIOSTOPMAP
	    Wait for a map done interrupt, do not restart the  map,  and  then
	    return to the user.

Restrictions
       An  invalid access (for example, longword) to a mapped interface regis‐
       ter can cause the system to crash with a machine check.

Diagnostics
       ps device intr.
       ps dma intr.
       An interrupt was received from  the  device.   This  shouldn't  happen,
       check your device configuration for overlapping interrupt vectors.

Files
				      VAX				 ps(4)
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