i386/libsaio/nbp.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 #include "libsaio.h"
  27
  28 /*
  29  * Convert zero-based linear address to far pointer.
  30  */
  31 #define GET_FP(x)   ( (((x) & 0xffff0000) << (16 - 4)) | ((x) & 0xffff) )
  32
  33 /*==========================================================================
  34  * Issue a command to the network loader.
  35  *
  36  * The 'cmd' command structure should be allocated on the stack to
  37  * ensure that it resides within the addressable range for the
  38  * network loader, which runs in real mode.
  39  */
  40 static UInt32 nbp(nbpCommandCode_t code, nbpCommand_u * cmd)
  41 {
  42         loader(code, GET_FP((UInt32) cmd));
  43
  44         // Must re-enable the A20 address line, the PXE firmware will
  45         // disable the A20 line control.
  46         //
  47         enableA20();
  48
  49         return cmd->header.status;
  50 }
  51
  52 /*==========================================================================
  53  * Unload Base Code Stack command.
  54  */
  55 UInt32 nbpUnloadBaseCode()
  56 {
  57     return nbp(nbpCommandUnloadBaseCode, (nbpCommand_u *) 0);
  58 }
  59
  60 /*==========================================================================
  61  * TFTP Read File command.
  62  */
  63 static long NBPLoadFile(CICell ih, char * filePath)
  64 {
  65     nbpCommandTFTPReadFile_s  cmd;
  66         UInt32                    ret;
  67
  68         strcpy(cmd.filename, filePath);
  69         cmd.status     = nbpStatusFailed;
  70         cmd.bufferSize = TFTP_LEN;
  71         cmd.buffer     = TFTP_ADDR;
  72
  73         verbose("Loading file: %s\n", filePath);
  74
  75         ret = nbp(nbpCommandTFTPReadFile, (nbpCommand_u *) &cmd);
  76
  77     return (ret == nbpStatusSuccess) ? (long)cmd.bufferSize : -1;
  78 }
  79
  80 /*==========================================================================
  81  * GetDirEntry is not supported.
  82  */
  83 static long NBPGetDirEntry(CICell ih, char * dirPath, long * dirIndex,
  84                            char ** name, long * flags, long * time)
  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 }