1 | /*␊ |
2 | * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊ |
3 | *␊ |
4 | * Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights␊ |
5 | * Reserved. This file contains Original Code and/or Modifications of␊ |
6 | * Original Code as defined in and that are subject to the Apple Public␊ |
7 | * Source License Version 2.0 (the "License"). You may not use this file␊ |
8 | * except in compliance with the License. Please obtain a copy of the␊ |
9 | * License at http://www.apple.com/publicsource and read it before using␊ |
10 | * this file.␊ |
11 | * ␊ |
12 | * The Original Code and all software distributed under the License are␊ |
13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the␊ |
17 | * License for the specific language governing rights and limitations␊ |
18 | * under the License.␊ |
19 | * ␊ |
20 | */␊ |
21 | ␊ |
22 | #include "libsaio.h"␊ |
23 | ␊ |
24 | /* This NBP code is pretty useless because it just blindly calls INT 2B.␊ |
25 | Presumably INT 2B was implemented by some first-stage bootloader that␊ |
26 | is long gone.␊ |
27 | ␊ |
28 | One good reason to disable this is that nbpScanBootVolumes always␊ |
29 | succeeds. The scanBootVolumes function thus never fails because␊ |
30 | it always falls back to NBP. This is a problem because there is␊ |
31 | other code in the booter (for example, in open) which needs to␊ |
32 | fail instead of attempting to use this NBP which will often␊ |
33 | hang the machine.␊ |
34 | */␊ |
35 | #ifndef NBP_SUPPORT␊ |
36 | #define NBP_SUPPORT 0␊ |
37 | #endif␊ |
38 | ␊ |
39 | #if NBP_SUPPORT␊ |
40 | ␊ |
41 | /*␊ |
42 | * Convert zero-based linear address to far pointer.␊ |
43 | */␊ |
44 | #define GET_FP(x) ( (((x) & 0xffff0000) << (16 - 4)) | ((x) & 0xffff) )␊ |
45 | ␊ |
46 | /*==========================================================================␊ |
47 | * Issue a command to the network loader.␊ |
48 | *␊ |
49 | * The 'cmd' command structure should be allocated on the stack to␊ |
50 | * ensure that it resides within the addressable range for the␊ |
51 | * network loader, which runs in real mode.␊ |
52 | */␊ |
53 | static UInt32 nbp(nbpCommandCode_t code, nbpCommand_u * cmd)␊ |
54 | {␊ |
55 | ␉loader(code, GET_FP((UInt32) cmd));␊ |
56 | ␊ |
57 | ␉// Must re-enable the A20 address line, the PXE firmware will␊ |
58 | ␉// disable the A20 line control.␊ |
59 | ␉//␊ |
60 | ␉enableA20();␊ |
61 | ␊ |
62 | ␉return cmd->header.status;␊ |
63 | }␊ |
64 | ␊ |
65 | /*==========================================================================␊ |
66 | * Unload Base Code Stack command.␊ |
67 | */␊ |
68 | UInt32 nbpUnloadBaseCode()␊ |
69 | {␊ |
70 | return nbp(nbpCommandUnloadBaseCode, (nbpCommand_u *) 0);␊ |
71 | }␊ |
72 | ␊ |
73 | /*==========================================================================␊ |
74 | * TFTP Read File command.␊ |
75 | */␊ |
76 | static long NBPLoadFile(CICell ih, char * filePath)␊ |
77 | {␊ |
78 | nbpCommandTFTPReadFile_s cmd;␊ |
79 | ␉UInt32 ret;␊ |
80 | ␊ |
81 | ␉strcpy((char *)cmd.filename, filePath);␊ |
82 | ␉cmd.status = nbpStatusFailed;␊ |
83 | ␉cmd.bufferSize = TFTP_LEN;␊ |
84 | ␉cmd.buffer = TFTP_ADDR;␊ |
85 | ␊ |
86 | ␉verbose("Loading file: %s\n", filePath);␊ |
87 | ␊ |
88 | ␉ret = nbp(nbpCommandTFTPReadFile, (nbpCommand_u *) &cmd);␊ |
89 | ␊ |
90 | return (ret == nbpStatusSuccess) ? (long)cmd.bufferSize : -1;␊ |
91 | }␊ |
92 | ␊ |
93 | /*==========================================================================␊ |
94 | * GetDirEntry is not supported.␊ |
95 | */␊ |
96 | static long NBPGetDirEntry(CICell ih, char * dirPath, long long * dirIndex,␊ |
97 | char ** name, long * flags, long * time,␊ |
98 | FinderInfo * finderInfo, long * infoValid)␊ |
99 | {␊ |
100 | return -1;␊ |
101 | }␊ |
102 | ␊ |
103 | //==========================================================================␊ |
104 | ␊ |
105 | static void NBPGetDescription(CICell ih, char * str, long strMaxLen)␊ |
106 | {␊ |
107 | sprintf( str, "Ethernet PXE Client" );␊ |
108 | }␊ |
109 | ␊ |
110 | //==========================================================================␊ |
111 | ␊ |
112 | BVRef nbpScanBootVolumes( int biosdev, int * countPtr )␊ |
113 | {␊ |
114 | static BVRef gNetBVR = NULL;␊ |
115 | ␊ |
116 | if ( countPtr ) *countPtr = 1;␊ |
117 | ␊ |
118 | if ( !gNetBVR )␊ |
119 | {␊ |
120 | gNetBVR = malloc( sizeof(*gNetBVR) );␊ |
121 | if ( gNetBVR )␊ |
122 | {␊ |
123 | bzero(gNetBVR, sizeof(*gNetBVR));␊ |
124 | gNetBVR->biosdev = biosdev;␊ |
125 | gNetBVR->flags = kBVFlagPrimary | kBVFlagNativeBoot;␊ |
126 | gNetBVR->description = NBPGetDescription;␊ |
127 | gNetBVR->fs_loadfile = NBPLoadFile;␊ |
128 | gNetBVR->fs_getdirentry = NBPGetDirEntry;␊ |
129 | }␊ |
130 | }␊ |
131 | return gNetBVR;␊ |
132 | }␊ |
133 | #else␊ |
134 | BVRef nbpScanBootVolumes( int biosdev, int * countPtr )␊ |
135 | {␊ |
136 | return NULL;␊ |
137 | }␊ |
138 | UInt32 nbpUnloadBaseCode()␊ |
139 | {␊ |
140 | return 0;␊ |
141 | }␊ |
142 | #endif␊ |
143 | |