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Annotation of sys/arch/hppa/include/nvm.h, Revision 1.1.1.1

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_ */