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_ */
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