ps man page on 4.4BSD

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PS(4)		       BSD/vax Kernel Interfaces Manual			 PS(4)

NAME
     ps — Evans and Sutherland Picture System 2 graphics device interface

SYNOPSIS
     device ps0 at uba? csr 0172460 vector psclockintr pssystemintr

DESCRIPTION
     The ps 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 ioctl(2)s:

     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 through these
			refresh buffers displaying them one by one on the
			screen.

     PSIOAUTOMAP	Start automatically passing the display file through
			the matrix processor and into the refresh buffer.  The
			argument is an address in user memory where the fol‐
			lowing 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 continually refresh the screen.

     PSIOSINGLEMAP	Single step the matrix process.	 The driver does not
			automatically feed display files through 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 exposures.

     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.

FILES
     /dev/ps

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 vec‐
     tors.

HISTORY
     The ps driver appeared in 4.2BSD.

BUGS
     An invalid access (e.g., longword) to a mapped interface register can
     cause the system to crash with a machine check.  A user process could
     possibly cause infinite interrupts hence bringing things to a crawl.

4.2 Berkeley Distribution	 June 5, 1993	     4.2 Berkeley Distribution
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