pk_devicekey.cxx

C++ 编写的EROS RTOS

/*
 * 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 <kerninc/kernel.hxx>
#include <kerninc/Key.hxx>
#include <kerninc/Invocation.hxx>
#include <eros/Device.h>
#include <eros/Invoke.h>
#include <eros/StdKeyType.h>
#include <kerninc/Thread.hxx>
#include <kerninc/BlockDev.hxx>

/* FIX -- device key needs a kosher index field, and should use
 * subtype for the class.
 */
void
DeviceKey(Invocation& inv)
{
  /* Note that DEV_GET_CLASS retrieves the CLASS from the device. */
  
  uint32_t devclass = DEV_GET_CLASS(inv.key->dk.devClass);

  if (inv.entry.code == (uint32_t) OC_KeyType) {
    COMMIT_POINT();
      
    inv.exit.code = AKT_Device;
    inv.exit.w1 = devclass;
    inv.exit.w2 = DEV_GET_SUBCLASS(inv.key->dk.devClass);
    return;
  }

  COMMIT_POINT();
      
  inv.exit.code = RC_UnknownRequest;
  return;
}