77 lines
2.8 KiB
C
77 lines
2.8 KiB
C
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/* $NetBSD: nvm.h,v 1.1 2002/06/06 19:48:09 fredette Exp $ */
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/* $OpenBSD: nvm.h,v 1.2 1998/11/23 03:28:22 mickey Exp $ */
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/*
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* Copyright (c) 1990, 1994 The University of Utah and
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* the Computer Systems Laboratory at the University of Utah (CSL).
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* All rights reserved.
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*
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* Permission to use, copy, modify and distribute this software is hereby
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* granted provided that (1) source code retains these copyright, permission,
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* and disclaimer notices, and (2) redistributions including binaries
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* reproduce the notices in supporting documentation, and (3) all advertising
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* materials mentioning features or use of this software display the following
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* acknowledgement: ``This product includes software developed by the
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* Computer Systems Laboratory at the University of Utah.''
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*
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* THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
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* IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
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* ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* CSL requests users of this software to return to csl-dist@cs.utah.edu any
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* improvements that they make and grant CSL redistribution rights.
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*
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* Utah $Hdr: nvm.h 1.4 94/12/14$
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* Author: Jeff Forys, University of Utah CSL
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*/
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#ifndef _MACHINE_NVM_H_
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#define _MACHINE_NVM_H_
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/*
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* The PDC provides access to Non-Volatile Memory (NVM). If this
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* is implemented (it's HVERSION dependent), the first 256 bytes
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* are formatted as follows:
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*
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* 0x000 +----------------------------+
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* | Implementation information |
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* 0x024 +----------------------------+
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* | |
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* | IPL information |
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* | |
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* 0x080 +----------------------------+
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* | |
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* | |
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* | OS Panic information |
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* | |
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* | |
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* 0x100 +----------------------------+
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*
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* It appears that there are at least 256 bytes of NVM, and only
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* the "OS Panic information" is not architected. This means that
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* we can use locations 0x80 - 0xFF for saving information across
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* boots (e.g. boot flags and boot device). I think we should use
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* the higher portions of this space first, to avoid conflicting
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* with possible future HP-PA plans for the NVM.
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*
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* The PDC requires that NVM be read/written to in word multiples.
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*/
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/*
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* Boot flags and boot device (0xF4 - 0xFF).
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*/
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#define NVM_BOOTDATA 0xF4 /* location of bootdata in NVM */
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#define NVM_BOOTMAGIC 0xACCEDE /* magic used for bootdata cksum */
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#define NVM_BOOTCKSUM(bd) \
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((unsigned int) NVM_BOOTMAGIC + (bd).flags + (bd).device)
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struct bootdata {
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unsigned int cksum; /* NVM_BOOTMAGIC + flags + device */
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unsigned int flags; /* boot flags */
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unsigned int device; /* boot device */
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};
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#endif /* _MACHINE_NVM_H_ */
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