i386/libsaio/nbp.c

   1 /*
   2  * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999-2003 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 2.0 (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
  27 /*
  28  * Convert zero-based linear address to far pointer.
  29  */
  30 #define GET_FP(x)   ( (((x) & 0xffff0000) << (16 - 4)) | ((x) & 0xffff) )
  31
  32 /*==========================================================================
  33  * Issue a command to the network loader.
  34  *
  35  * The 'cmd' command structure should be allocated on the stack to
  36  * ensure that it resides within the addressable range for the
  37  * network loader, which runs in real mode.
  38  */
  39 static UInt32 nbp(nbpCommandCode_t code, nbpCommand_u * cmd)
  40 {
  41         loader(code, GET_FP((UInt32) cmd));
  42
  43         // Must re-enable the A20 address line, the PXE firmware will
  44         // disable the A20 line control.
  45         //
  46         enableA20();
  47
  48         return cmd->header.status;
  49 }
  50
  51 /*==========================================================================
  52  * Unload Base Code Stack command.
  53  */
  54 UInt32 nbpUnloadBaseCode()
  55 {
  56     return nbp(nbpCommandUnloadBaseCode, (nbpCommand_u *) 0);
  57 }
  58
  59 /*==========================================================================
  60  * TFTP Read File command.
  61  */
  62 static long NBPLoadFile(CICell ih, char * filePath)
  63 {
  64     nbpCommandTFTPReadFile_s  cmd;
  65         UInt32                    ret;
  66
  67         strcpy((char *)cmd.filename, filePath);
  68         cmd.status     = nbpStatusFailed;
  69         cmd.bufferSize = TFTP_LEN;
  70         cmd.buffer     = TFTP_ADDR;
  71
  72         verbose("Loading file: %s\n", filePath);
  73
  74         ret = nbp(nbpCommandTFTPReadFile, (nbpCommand_u *) &cmd);
  75
  76     return (ret == nbpStatusSuccess) ? (long)cmd.bufferSize : -1;
  77 }
  78
  79 /*==========================================================================
  80  * GetDirEntry is not supported.
  81  */
  82 static long NBPGetDirEntry(CICell ih, char * dirPath, long * dirIndex,
  83                            char ** name, long * flags, long * time,
  84                            FinderInfo * finderInfo, long * infoValid)
  85 {
  86     return -1;
  87 }
  88
  89 //==========================================================================
  90
  91 static void NBPGetDescription(CICell ih, char * str, long strMaxLen)
  92 {
  93     sprintf( str, "Ethernet PXE Client" );
  94 }
  95
  96 //==========================================================================
  97
  98 BVRef nbpScanBootVolumes( int biosdev, int * countPtr )
  99 {
 100     static BVRef gNetBVR = NULL;
 101
 102     if ( countPtr ) *countPtr = 1;
 103
 104     if ( !gNetBVR )
 105     {
 106         gNetBVR = malloc( sizeof(*gNetBVR) );
 107         if ( gNetBVR )
 108         {
 109             bzero(gNetBVR, sizeof(*gNetBVR));
 110             gNetBVR->biosdev = biosdev;
 111             gNetBVR->flags   = kBVFlagPrimary | kBVFlagNativeBoot;
 112             gNetBVR->description = NBPGetDescription;
 113             gNetBVR->fs_loadfile = NBPLoadFile;
 114             gNetBVR->fs_getdirentry = NBPGetDirEntry;
 115         }
 116     }
 117     return gNetBVR;
 118 }