archdescrip.hxx

C++ 编写的EROS RTOS

#ifndef __REGDESCRIP_HXX__
#define __REGDESCRIP_HXX__

/*
 * Copyright (C) 1998, 1999, Jonathan S. Shapiro.
 *
 * This file is part of the EROS Operating System.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2,
 * or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */


#include <eros/target.h>
#include <erosimg/Intern.hxx>

/* The RegDescrip structures describes the registers associated with a
 * particular architecture, the default values for these registers,
 * and the layout of the registers in the domain root and general
 * registers nodes.
 */


/* The 'RegDescrip' structure describes the architected registers and
 * their default values (if any).  For each register, it gives the
 * name, the length in bytes of the register, and the default value.
 * If a default value is provided the register will be initialized to
 * that value in the domain by mkimage.  If no default makes sense, or
 * if the register should not be initialized (e.g. overlapping
 * registers on x86), use '0' for the default value string.
 * 
 * RegDescrip also provides the externalized interface for reading and
 * writing values.
 */

class ErosImage;
struct DiskKey;

struct RegDescrip {
  InternedString arch;		/* architecture name */
  InternedString name;		/* register name */
  bool big_endian;
  uint32_t len;			/* register size in bytes */
  const char *dfltValue;	/* default value, if any */

  enum { MaxRegSize = 16 };	/* maximum size in bytes of any */
				/* register -- used in parsing */

public:
  void WriteValue(ErosImage& ei, DiskKey& rootNodeKey,
		  const InternedString& value);
  
  static bool IsArchName(InternedString& arch);

  static RegDescrip *Lookup(InternedString& arch,
			    InternedString& regName);

  static void InitProcess(ErosImage& ei, DiskKey& rootNodeKey,
			  InternedString& arch);
};


#endif /* __REGDESCRIP_HXX__ */