dsk_keytype.cxx

C++ 编写的EROS RTOS

/*
 * 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.
 */

#include <eros/target.h>
#include <disk/KeyStruct.hxx>

bool
KeyBits::IsNodeKeyType() const
{
  switch (GetType()) {
#ifdef KT_Wrapper
  case KT_Wrapper:
#endif
  case KT_Node:
  case KT_Segment:
  case KT_Process:
  case KT_Start:
  case KT_Resume:
    return true;
  default:
    return false;
  }
}

void
KeyBits::KS_SetNumberKey(uint32_t hi, uint32_t mid, uint32_t lo)
{
#ifdef __KERNEL__
  IKS_Unchain();
#endif

  InitType(KT_Number);
  SetUnprepared();
  SetReadOnly();
  nk.value[0] = lo;
  nk.value[1] = mid;
  nk.value[2] = hi;
}

void
KeyBits::KS_VoidKey()
{
#ifdef __KERNEL__
  IKS_Unchain();
#endif

  InitType(KT_Void);
  nk.value[0] = 0;
  nk.value[1] = 0;
  nk.value[2] = 0;
}

void
KeyBits::KS_Set(KeyBits& kb)
{
  /* Skip copy if src == dest (surprisingly often!) */
  if (&kb == (KeyBits*) this)
    return;
    
#ifdef __KERNEL__
  IKS_Unchain();
#endif

  keyType = kb.keyType;
  keyFlags = kb.keyFlags & ~KFL_HAZARD_BITS;
  keyData = kb.keyData;

  nk.value[0] = kb.nk.value[0];
  nk.value[1] = kb.nk.value[1];
  nk.value[2] = kb.nk.value[2];

  /* Update the linkages if destination is now prepared: */
  if ( IsPreparedObjectKey() ) {
    ok.prev->next = (KeyRing*) this;
    ok.next = (KeyRing*) &kb;
    kb.ok.prev = (KeyRing*) this;
  }
}