segwalk.hxx

C++ 编写的EROS RTOS

#ifndef __SEGWALK_HXX__
#define __SEGWALK_HXX__
/*
 * Copyright (C) 1998, 1999, 2001, 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.
 */

#if 0
#define SW_ISWRITE     0x1u
#define SW_ISPROMPT    0x2u
#define SW_CANCALL     0x4u
#define SW_CANWRITE    0x8u
#endif
/* #define SW_CANTRAVERSE 0x10u */

struct SegWalk {
  uint32_t   frameBits;		/* number of bits in frame offset */
  uva_t      vaddr;		/* in case invoking domain keeper */

  Key        *pSegKey;
  uint32_t   segBlss;
  struct ObjectHeader
             *segObj;
#ifdef KT_Wrapper
  bool       segObjIsWrapper;
#else
  bool       segObjIsRed;
#endif
  uint64_t   offset;
  Node       *redSeg;
  uint64_t   redSegOffset;
  uint32_t   redSpanBlss;	/* blss of segment spanned by red seg */

#if 0
  uint32_t   flags;
#else
  bool       writeAccess;

  bool       canCall;
  bool       canWrite;
  bool       canFullFetch;	/* not a sensory path */
#endif
  bool       invokeKeeperOK;
  bool       invokeProcessKeeperOK;

  bool       wantLeafNode;

  uint32_t   faultCode;
  uint32_t   traverseCount;
};
  
void segwalk_init(SegWalk &wi, Key *pSegKey);

#endif /* __SEGWALK_HXX__ */