driver.c

C++ 编写的EROS RTOS

/*
 * Copyright (C) 1998, 1999, 2001, The EROS Group.
 *
 * 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.
 */


/*
 * Test of EROS memory mapping.
 */

#include <eros/target.h>
#include <eros/Invoke.h>
#include <eros/ProcessKey.h>
#include <eros/Key.h>
#include <domain/domdbg.h>
#include "memmap.h"

/**Handle the stack stuff**/
const uint32_t __rt_stack_pages = 0;
const uint32_t __rt_stack_pointer = 0x10000;

/* Key Registers: */
#define KR_VOID 0
#define KR_OSTREAM 1
#define KR_REFERENCER 2
#define KR_DriverStart0 3
#define KR_DriverStart1 4
#define KR_DriverStartN 5 /* 5 through 8 have keyData 2 through 5 */
#define KR_ReferencerStartAddr 16 /* number key with start addr of referencer */
#define KR_ReferencerProcess 17 /* process key to referencer */

#define KR_RK0   12
#define KR_RK1   13
#define KR_RK2   14
#define KR_RESUME  15		/* so don't use it for anything else! */

uint8_t buf[EROS_PAGE_SIZE];

int
DoReference(enum refType type,
            uint32_t addr)
{
  Message msg;
  
  msg.snd_invKey = KR_REFERENCER;
  msg.snd_key0 = KR_VOID;
  msg.snd_key1 = KR_VOID;
  msg.snd_key2 = KR_VOID;
  msg.snd_key3 = KR_DriverStart0;
  msg.snd_data = 0;
  msg.snd_len = 0;
  msg.snd_code = type;
  msg.snd_w1 = addr;
  msg.snd_w2 = 0;
  msg.snd_w3 = 0;

  msg.rcv_key0 = KR_RK0;
  msg.rcv_key1 = KR_RK1;
  msg.rcv_key2 = KR_RK2;
  msg.rcv_key3 = KR_RESUME;
  msg.rcv_data = 0;
  msg.rcv_len = 0;

  kprintf(KR_OSTREAM, "driver: requesting %d 0x%08x\n", type, addr);
  RETURN(&msg);
  kprintf(KR_OSTREAM, "driver: got keyInfo %d.\n", msg.rcv_keyInfo);
  /* msg.rcv_keyInfo == 0 is a normal return.
     Any other value means the referencer called a keeper,
     in which case we must restart the referencer. */
  if (msg.rcv_keyInfo != 0) {
    uint32_t ret = process_swap(KR_ReferencerProcess,
                                ProcPCandSP,
                                KR_ReferencerStartAddr,
                                KR_VOID);
    if (!ret) kdprintf(KR_OSTREAM, "driver: process_swap ret %d\n", ret);
    msg.snd_invKey = KR_RESUME;
    SEND(&msg);
  }
  return msg.rcv_keyInfo;
}

int
main()
{
  DoReference(refReadDirect, 0);
  DoReference(refReadDirect, 0x1004);
  DoReference(refReadDirect, 0);
  DoReference(refReadDirect, 0x1004);
  return 0;
}