| 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 | #include "libsaio.h"␊ |
| 25 | #include "nbp_cmd.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 | ␊ |
| 39 | ␊ |
| 40 | /*␊ |
| 41 | * Convert zero-based linear address to far pointer.␊ |
| 42 | */␊ |
| 43 | #define GET_FP(x) ( (((x) & 0xffff0000) << (16 - 4)) | ((x) & 0xffff) )␊ |
| 44 | ␊ |
| 45 | /*==========================================================================␊ |
| 46 | * Issue a command to the network loader.␊ |
| 47 | *␊ |
| 48 | * The 'cmd' command structure should be allocated on the stack to␊ |
| 49 | * ensure that it resides within the addressable range for the␊ |
| 50 | * network loader, which runs in real mode.␊ |
| 51 | */␊ |
| 52 | static UInt32 nbp(nbpCommandCode_t code, nbpCommand_u * cmd)␊ |
| 53 | {␊ |
| 54 | ␉loader(code, GET_FP((UInt32) cmd));␊ |
| 55 | ␊ |
| 56 | ␉// Must re-enable the A20 address line, the PXE firmware will␊ |
| 57 | ␉// disable the A20 line control.␊ |
| 58 | ␉//␊ |
| 59 | ␉enableA20();␊ |
| 60 | ␊ |
| 61 | ␉return cmd->header.status;␊ |
| 62 | }␊ |
| 63 | ␊ |
| 64 | /*==========================================================================␊ |
| 65 | * Unload Base Code Stack command.␊ |
| 66 | */␊ |
| 67 | UInt32 nbpUnloadBaseCode()␊ |
| 68 | {␊ |
| 69 | return nbp(nbpCommandUnloadBaseCode, (nbpCommand_u *) 0);␊ |
| 70 | }␊ |
| 71 | ␊ |
| 72 | /*==========================================================================␊ |
| 73 | * TFTP Read File command.␊ |
| 74 | */␊ |
| 75 | static long NBPLoadFile(CICell ih, char * filePath)␊ |
| 76 | {␊ |
| 77 | nbpCommandTFTPReadFile_s cmd;␊ |
| 78 | ␉UInt32 ret;␊ |
| 79 | ␊ |
| 80 | ␉strcpy((char *)cmd.filename, filePath);␊ |
| 81 | ␉cmd.status = nbpStatusFailed;␊ |
| 82 | ␉cmd.bufferSize = TFTP_LEN;␊ |
| 83 | ␉cmd.buffer = TFTP_ADDR;␊ |
| 84 | ␊ |
| 85 | ␉verbose("Loading file: %s\n", filePath);␊ |
| 86 | ␊ |
| 87 | ␉ret = nbp(nbpCommandTFTPReadFile, (nbpCommand_u *) &cmd);␊ |
| 88 | ␊ |
| 89 | return (ret == nbpStatusSuccess) ? (long)cmd.bufferSize : -1;␊ |
| 90 | }␊ |
| 91 | ␊ |
| 92 | /*==========================================================================␊ |
| 93 | * GetDirEntry is not supported.␊ |
| 94 | */␊ |
| 95 | static long NBPGetDirEntry(CICell ih, char * dirPath, long long * dirIndex,␊ |
| 96 | char ** name, long * flags, long * time,␊ |
| 97 | FinderInfo * finderInfo, long * infoValid)␊ |
| 98 | {␊ |
| 99 | return -1;␊ |
| 100 | }␊ |
| 101 | ␊ |
| 102 | //==========================================================================␊ |
| 103 | ␊ |
| 104 | static void NBPGetDescription(CICell ih, char * str, long strMaxLen)␊ |
| 105 | {␊ |
| 106 | snprintf( str, strMaxLen,"Ethernet PXE Client" );␊ |
| 107 | }␊ |
| 108 | ␊ |
| 109 | //==========================================================================␊ |
| 110 | ␊ |
| 111 | BVRef nbpScanBootVolumes( int biosdev, int * countPtr )␊ |
| 112 | {␊ |
| 113 | static BVRef gNetBVR = NULL;␊ |
| 114 | ␊ |
| 115 | if ( countPtr ) *countPtr = 1;␊ |
| 116 | ␊ |
| 117 | if ( !gNetBVR )␊ |
| 118 | {␊ |
| 119 | gNetBVR = malloc( sizeof(struct BootVolume) );␊ |
| 120 | if ( gNetBVR )␊ |
| 121 | {␊ |
| 122 | bzero(gNetBVR, sizeof(struct BootVolume));␊ |
| 123 | gNetBVR->biosdev = biosdev;␊ |
| 124 | gNetBVR->flags = kBVFlagPrimary | kBVFlagNativeBoot;␊ |
| 125 | gNetBVR->description = NBPGetDescription;␊ |
| 126 | gNetBVR->fs_loadfile = NBPLoadFile;␊ |
| 127 | gNetBVR->fs_getdirentry = NBPGetDirEntry;␊ |
| 128 | }␊ |
| 129 | }␊ |
| 130 | return gNetBVR;␊ |
| 131 | } |
