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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/* This NBP code is pretty useless because it just blindly calls INT 2B.
28 Presumably INT 2B was implemented by some first-stage bootloader that
29 is long gone.
30
31 One good reason to disable this is that nbpScanBootVolumes always
32 succeeds. The scanBootVolumes function thus never fails because
33 it always falls back to NBP. This is a problem because there is
34 other code in the booter (for example, in open) which needs to
35 fail instead of attempting to use this NBP which will often
36 hang the machine.
37 */
38#ifndef NBP_SUPPORT
39#define NBP_SUPPORT 0
40#endif
41
42#if NBP_SUPPORT
43
44/*
45 * Convert zero-based linear address to far pointer.
46 */
47#define GET_FP(x) ( (((x) & 0xffff0000) << (16 - 4)) | ((x) & 0xffff) )
48
49/*==========================================================================
50 * Issue a command to the network loader.
51 *
52 * The 'cmd' command structure should be allocated on the stack to
53 * ensure that it resides within the addressable range for the
54 * network loader, which runs in real mode.
55 */
56static UInt32 nbp(nbpCommandCode_t code, nbpCommand_u * cmd)
57{
58loader(code, GET_FP((UInt32) cmd));
59
60// Must re-enable the A20 address line, the PXE firmware will
61// disable the A20 line control.
62//
63enableA20();
64
65return cmd->header.status;
66}
67
68/*==========================================================================
69 * Unload Base Code Stack command.
70 */
71UInt32 nbpUnloadBaseCode()
72{
73 return nbp(nbpCommandUnloadBaseCode, (nbpCommand_u *) 0);
74}
75
76/*==========================================================================
77 * TFTP Read File command.
78 */
79static long NBPLoadFile(CICell ih, char * filePath)
80{
81 nbpCommandTFTPReadFile_s cmd;
82UInt32 ret;
83
84strcpy((char *)cmd.filename, filePath);
85cmd.status = nbpStatusFailed;
86cmd.bufferSize = TFTP_LEN;
87cmd.buffer = TFTP_ADDR;
88
89verbose("Loading file: %s\n", filePath);
90
91ret = nbp(nbpCommandTFTPReadFile, (nbpCommand_u *) &cmd);
92
93 return (ret == nbpStatusSuccess) ? (long)cmd.bufferSize : -1;
94}
95
96/*==========================================================================
97 * GetDirEntry is not supported.
98 */
99static long NBPGetDirEntry(CICell ih, char * dirPath, long long * dirIndex,
100 char ** name, long * flags, long * time,
101 FinderInfo * finderInfo, long * infoValid)
102{
103 return -1;
104}
105
106//==========================================================================
107
108static void NBPGetDescription(CICell ih, char * str, long strMaxLen)
109{
110 sprintf( str, "Ethernet PXE Client" );
111}
112
113//==========================================================================
114
115BVRef nbpScanBootVolumes( int biosdev, int * countPtr )
116{
117 static BVRef gNetBVR = NULL;
118
119 if ( countPtr ) *countPtr = 1;
120
121 if ( !gNetBVR )
122 {
123 gNetBVR = malloc( sizeof(*gNetBVR) );
124 if ( gNetBVR )
125 {
126 bzero(gNetBVR, sizeof(*gNetBVR));
127 gNetBVR->biosdev = biosdev;
128 gNetBVR->flags = kBVFlagPrimary | kBVFlagNativeBoot;
129 gNetBVR->description = NBPGetDescription;
130 gNetBVR->fs_loadfile = NBPLoadFile;
131 gNetBVR->fs_getdirentry = NBPGetDirEntry;
132 }
133 }
134 return gNetBVR;
135}
136#else
137BVRef nbpScanBootVolumes( int biosdev, int * countPtr )
138{
139 return NULL;
140}
141UInt32 nbpUnloadBaseCode()
142{
143 return 0;
144}
145#endif
146

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