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Annotation of 43BSDTahoe/man/man4/vax/ps.4, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1983 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)ps.4        6.3 (Berkeley) 5/21/86
        !             6: .\"
        !             7: .TH PS 4 "May 21, 1986"
        !             8: .UC 5
        !             9: .SH NAME
        !            10: ps \- Evans and Sutherland Picture System 2 graphics device interface
        !            11: .SH SYNOPSIS
        !            12: .B "device ps0 at uba? csr 0172460 vector psclockintr pssystemintr"
        !            13: .SH DESCRIPTION
        !            14: The
        !            15: .I ps
        !            16: driver provides access
        !            17: to an Evans and
        !            18: Sutherland Picture System 2 graphics device.
        !            19: Each minor device is a new PS2.
        !            20: When the device is opened, its interface registers are mapped,
        !            21: via virtual memory, into a user process's address space.
        !            22: This allows the user process very high bandwidth to the device
        !            23: with no system call overhead.
        !            24: .PP
        !            25: DMA to and from the PS2 is not supported. All read and write
        !            26: system calls will fail.
        !            27: All data is moved to and from the PS2 via programmed I/O using
        !            28: the device's interface registers.
        !            29: .PP
        !            30: Commands are fed to and from the driver using the following ioctls:
        !            31: .TP
        !            32: PSIOGETADDR
        !            33: .br
        !            34: Returns the virtual address through which the user process can access
        !            35: the device's interface registers.
        !            36: .TP
        !            37: PSIOAUTOREFRESH
        !            38: .br
        !            39: Start auto refreshing the screen.
        !            40: The argument is an address in user space where the following data resides.
        !            41: The first longword is a
        !            42: .I count
        !            43: of the number of static refresh buffers.
        !            44: The next
        !            45: .I count
        !            46: longwords are the addresses in refresh memory where
        !            47: the refresh buffers lie.
        !            48: The driver will cycle through these refresh buffers displaying them one by one
        !            49: on the screen.
        !            50: .TP
        !            51: PSIOAUTOMAP
        !            52: .br
        !            53: Start automatically passing the display file through the matrix processor and
        !            54: into the refresh buffer.
        !            55: The argument is an address in user memory where the following data resides.
        !            56: The first longword is a
        !            57: .I count
        !            58: of the number of display files to operate on.
        !            59: The next
        !            60: .I count
        !            61: longwords are the address of these display files.
        !            62: The final longword is the address in refresh buffer memory where transformed
        !            63: coordinates are to be placed if the driver is not in double buffer mode (see
        !            64: below).
        !            65: .TP
        !            66: PSIODOUBLEBUFFER
        !            67: .br
        !            68: Cause the driver to double buffer the output from the map that
        !            69: is going to the refresh buffer.
        !            70: The argument is again a user space address where the real arguments are stored.
        !            71: The first argument is the starting address of refresh memory where the two
        !            72: double buffers are located.
        !            73: The second argument is the length of each double buffer.
        !            74: The refresh mechanism displays the current double buffer, in addition
        !            75: to its static refresh lists, when in double buffer mode.
        !            76: .TP
        !            77: PSIOSINGLEREFRESH
        !            78: .br
        !            79: Single step the refresh process. That is, the driver does not continually
        !            80: refresh the screen.
        !            81: .TP
        !            82: PSIOSINGLEMAP
        !            83: .br
        !            84: Single step the matrix process.
        !            85: The driver does not automatically feed display files through the matrix unit.
        !            86: .TP
        !            87: PSIOSINGLEBUFFER
        !            88: .br
        !            89: Turn off double buffering.
        !            90: .TP
        !            91: PSIOTIMEREFRESH
        !            92: .br
        !            93: The argument is a count of the number of refresh interrupts to take
        !            94: before turning off the screen.  This is used to do time exposures.
        !            95: .TP
        !            96: PSIOWAITREFRESH
        !            97: .br
        !            98: Suspend the user process until a refresh interrupt has occurred.
        !            99: If in TIMEREFRESH mode, suspend until count refreshes have occurred.
        !           100: .TP
        !           101: PSIOSTOPREFRESH
        !           102: .br
        !           103: Wait for the next refresh, stop all refreshes, and then return to user process.
        !           104: .TP
        !           105: PSIOWAITMAP
        !           106: .br
        !           107: Wait until a map done interrupt has occurred.
        !           108: .TP
        !           109: PSIOSTOPMAP
        !           110: .br
        !           111: Wait for a map done interrupt, do not restart the map, and then
        !           112: return to the user.
        !           113: .SH FILES
        !           114: /dev/ps
        !           115: .SH DIAGNOSTICS
        !           116: .BR "ps device intr" .
        !           117: .br
        !           118: .BR "ps dma intr" .
        !           119: An interrupt was received from the device. 
        !           120: This shouldn't happen,
        !           121: check your device configuration for overlapping interrupt vectors.
        !           122: .SH BUGS
        !           123: An invalid access (e.g., longword) to a mapped interface register
        !           124: can cause the system to crash with a machine check.
        !           125: A user process could possibly cause infinite interrupts hence
        !           126: bringing things to a crawl.

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