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Annotation of sys/arch/hppa/include/nvm.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: nvm.h,v 1.2 1998/11/23 03:28:22 mickey Exp $  */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1990, 1994 The University of Utah and
        !             5:  * the Computer Systems Laboratory at the University of Utah (CSL).
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Permission to use, copy, modify and distribute this software is hereby
        !             9:  * granted provided that (1) source code retains these copyright, permission,
        !            10:  * and disclaimer notices, and (2) redistributions including binaries
        !            11:  * reproduce the notices in supporting documentation, and (3) all advertising
        !            12:  * materials mentioning features or use of this software display the following
        !            13:  * acknowledgement: ``This product includes software developed by the
        !            14:  * Computer Systems Laboratory at the University of Utah.''
        !            15:  *
        !            16:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
        !            17:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
        !            18:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            19:  *
        !            20:  * CSL requests users of this software to return to csl-dist@cs.utah.edu any
        !            21:  * improvements that they make and grant CSL redistribution rights.
        !            22:  *
        !            23:  *     Utah $Hdr: nvm.h 1.4 94/12/14$
        !            24:  *     Author: Jeff Forys, University of Utah CSL
        !            25:  */
        !            26:
        !            27: #ifndef _MACHINE_NVM_H_
        !            28: #define        _MACHINE_NVM_H_
        !            29:
        !            30: /*
        !            31:  * The PDC provides access to Non-Volatile Memory (NVM).  If this
        !            32:  * is implemented (it's HVERSION dependent), the first 256 bytes
        !            33:  * are formatted as follows:
        !            34:  *
        !            35:  *     0x000   +----------------------------+
        !            36:  *             | Implementation information |
        !            37:  *     0x024   +----------------------------+
        !            38:  *             |                            |
        !            39:  *             |      IPL information       |
        !            40:  *             |                            |
        !            41:  *     0x080   +----------------------------+
        !            42:  *             |                            |
        !            43:  *             |                            |
        !            44:  *             |    OS Panic information    |
        !            45:  *             |                            |
        !            46:  *             |                            |
        !            47:  *     0x100   +----------------------------+
        !            48:  *
        !            49:  * It appears that there are at least 256 bytes of NVM, and only
        !            50:  * the "OS Panic information" is not architected.  This means that
        !            51:  * we can use locations 0x80 - 0xFF for saving information across
        !            52:  * boots (e.g. boot flags and boot device).  I think we should use
        !            53:  * the higher portions of this space first, to avoid conflicting
        !            54:  * with possible future HP-PA plans for the NVM.
        !            55:  *
        !            56:  * The PDC requires that NVM be read/written to in word multiples.
        !            57:  */
        !            58:
        !            59: /*
        !            60:  * Boot flags and boot device (0xF4 - 0xFF).
        !            61:  */
        !            62:
        !            63: #define        NVM_BOOTDATA    0xF4            /* location of bootdata in NVM */
        !            64: #define        NVM_BOOTMAGIC   0xACCEDE        /* magic used for bootdata cksum */
        !            65: #define        NVM_BOOTCKSUM(bd) \
        !            66:        ((unsigned int) NVM_BOOTMAGIC + (bd).flags + (bd).device)
        !            67:
        !            68: struct bootdata {
        !            69:        unsigned int cksum;             /* NVM_BOOTMAGIC + flags + device */
        !            70:        unsigned int flags;             /* boot flags */
        !            71:        unsigned int device;            /* boot device */
        !            72: };
        !            73:
        !            74: #endif /* _MACHINE_NVM_H_ */