i386/libsaio/nbp.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 #include "libsaio.h"
  26 #include "nbp.h"
  27
  28 /*==========================================================================
  29  * Issue a command to the network loader.
  30  *
  31  * The 'cmd' command structure should be allocated on the stack to
  32  * ensure that it resides within the addressable range for the
  33  * network loader, which runs in real mode.
  34  */
  35 UInt32
  36 nbp(nbpCommandCode_t code, nbpCommand_u * cmd)
  37 {
  38         loader(code, GET_FP((UInt32) cmd));
  39
  40         // Must re-enable the A20 address line, the PXE firmware will
  41         // disable the A20 line control.
  42         //
  43         enableA20();
  44
  45         return cmd->header.status;
  46 }
  47
  48 /*==========================================================================
  49  * Execute a TFTP Read File command.
  50  *
  51  */
  52 UInt32 nbpTFTPReadFile(UInt8 *  filename,   // name of the file
  53                        UInt32 * bufferSize, // [IN] size limit, [OUT} real size
  54                        UInt32   bufferAddr) // physical address
  55 {
  56     nbpCommandTFTPReadFile_s  cmd;
  57         UInt32                    ret;
  58
  59         strcpy(cmd.filename, filename);
  60         cmd.status     = nbpStatusFailed;
  61         cmd.bufferSize = *bufferSize;
  62         cmd.buffer     = bufferAddr;
  63
  64         ret = nbp(nbpCommandTFTPReadFile, (nbpCommand_u *) &cmd);
  65
  66         *bufferSize = cmd.bufferSize;  // bytes transferred
  67
  68     return ret;
  69 }
  70
  71 /*==========================================================================
  72  * Execute an Unload Base Code Stack command.
  73  *
  74  */
  75 UInt32 nbpUnloadBaseCode()
  76 {
  77     return nbp(nbpCommandUnloadBaseCode, (nbpCommand_u *) 0);
  78 }