1 | //====================================================================== |
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2 | // |
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3 | // Project: XTIDE Universal BIOS, Serial Port Server |
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4 | // |
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5 | // File: process.cpp - Processes commands received over the serial port |
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6 | // |
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7 | |
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8 | // |
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9 | // XTIDE Universal BIOS and Associated Tools |
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10 | // Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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11 | // |
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12 | // This program is free software; you can redistribute it and/or modify |
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13 | // it under the terms of the GNU General Public License as published by |
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14 | // the Free Software Foundation; either version 2 of the License, or |
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15 | // (at your option) any later version. |
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16 | // |
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17 | // This program is distributed in the hope that it will be useful, |
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18 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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19 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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20 | // GNU General Public License for more details. |
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21 | // Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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22 | // |
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23 | |
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24 | #include "library.h" |
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25 | #include <memory.h> |
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26 | #include <string.h> |
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27 | #include <stdio.h> |
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28 | |
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29 | union _buff { |
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30 | struct { |
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31 | unsigned char command; |
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32 | unsigned char driveAndHead; |
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33 | unsigned char count; |
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34 | unsigned char sector; |
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35 | unsigned short cylinder; |
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36 | } chs; |
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37 | struct { |
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38 | unsigned char command; |
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39 | unsigned char bits24; |
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40 | unsigned char count; |
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41 | unsigned char bits00; |
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42 | unsigned char bits08; |
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43 | unsigned char bits16; |
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44 | } lba; |
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45 | struct { |
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46 | unsigned char command; |
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47 | unsigned char driveAndHead; |
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48 | unsigned char count; |
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49 | unsigned char scan; |
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50 | unsigned char port; |
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51 | unsigned char baud; |
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52 | } inquire; |
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53 | struct { |
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54 | unsigned char command; |
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55 | unsigned char driveAndHead; |
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56 | unsigned char count; |
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57 | unsigned char scan; |
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58 | unsigned short PackedPortAndBaud; |
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59 | } inquirePacked; |
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60 | unsigned char b[514]; |
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61 | unsigned short w[257]; |
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62 | } buff; |
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63 | |
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64 | #define SERIAL_COMMAND_HEADER 0xa0 |
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65 | |
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66 | #define SERIAL_COMMAND_WRITE 1 |
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67 | #define SERIAL_COMMAND_READWRITE 2 |
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68 | #define SERIAL_COMMAND_RWMASK 3 |
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69 | #define SERIAL_COMMAND_INQUIRE 0 |
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70 | |
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71 | #define SERIAL_COMMAND_MASK 0xe3 |
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72 | #define SERIAL_COMMAND_HEADERMASK 0xe0 |
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73 | |
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74 | #define ATA_COMMAND_LBA 0x40 |
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75 | #define ATA_COMMAND_HEADMASK 0xf |
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76 | |
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77 | #define ATA_DriveAndHead_Drive 0x10 |
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78 | |
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79 | void logBuff( char *message, unsigned long buffoffset, unsigned long readto, int verboseLevel ) |
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80 | { |
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81 | char logBuff[ 514*9 + 10 ]; |
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82 | int logCount; |
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83 | |
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84 | if( verboseLevel == 5 || (verboseLevel >= 3 && buffoffset == readto) ) |
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85 | { |
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86 | if( verboseLevel == 3 && buffoffset > 11 ) |
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87 | logCount = 11; |
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88 | else |
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89 | logCount = buffoffset; |
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90 | |
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91 | for( int t = 0; t < logCount; t++ ) |
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92 | sprintf( &logBuff[t*9], "[%3d:%02x] ", t, buff.b[t] ); |
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93 | if( logCount != buffoffset ) |
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94 | sprintf( &logBuff[logCount*9], "... " ); |
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95 | |
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96 | log( 3, "%s%s", message, logBuff ); |
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97 | } |
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98 | } |
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99 | |
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100 | void processRequests( SerialAccess *serial, Image *image0, Image *image1, int timeoutEnabled, int verboseLevel ) |
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101 | { |
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102 | unsigned char workCommand; |
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103 | int workOffset, workCount; |
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104 | |
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105 | unsigned long mylba; |
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106 | unsigned long readto; |
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107 | unsigned long buffoffset; |
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108 | unsigned long lasttick; |
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109 | unsigned short crc; |
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110 | unsigned long GetTime_Timeout_Local; |
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111 | unsigned long len; |
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112 | Image *img; |
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113 | unsigned long cyl, sect, head; |
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114 | unsigned long perfTimer; |
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115 | unsigned char lastScan; |
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116 | |
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117 | GetTime_Timeout_Local = GetTime_Timeout(); |
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118 | |
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119 | buffoffset = 0; |
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120 | readto = 0; |
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121 | workCount = workOffset = workCommand = 0; |
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122 | lastScan = 0; |
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123 | |
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124 | // |
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125 | // Floppy disks must come after any hard disks |
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126 | // |
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127 | if( (image0 && image0->floppy) && (image1 && !image1->floppy) ) |
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128 | { |
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129 | img = image0; |
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130 | image0 = image1; |
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131 | image1 = img; |
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132 | } |
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133 | |
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134 | lasttick = GetTime(); |
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135 | |
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136 | while( (len = serial->readCharacters( &buff.b[buffoffset], (readto ? readto-buffoffset : 1) )) ) |
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137 | { |
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138 | buffoffset += len; |
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139 | |
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140 | // |
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141 | // For debugging, look at the incoming packet |
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142 | // |
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143 | if( verboseLevel >= 3 ) |
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144 | logBuff( " Received: ", buffoffset, readto, verboseLevel ); |
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145 | |
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146 | if( timeoutEnabled && readto && GetTime() > lasttick + GetTime_Timeout_Local ) |
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147 | { |
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148 | log( 1, "Timeout waiting on data from client, aborting previous command" ); |
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149 | |
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150 | workCount = workOffset = workCommand = 0; |
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151 | readto = 0; |
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152 | |
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153 | if( len <= 8 && (buff.b[buffoffset-len] & SERIAL_COMMAND_HEADERMASK) == SERIAL_COMMAND_HEADER ) |
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154 | { |
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155 | // assume that we are at the front of a new command |
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156 | // |
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157 | memcpy( &buff.b[0], &buff.b[buffoffset-len], len ); |
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158 | buffoffset = len; |
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159 | readto = 8; |
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160 | // fall through to normal processing |
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161 | } |
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162 | else if( len == 1 ) |
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163 | { |
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164 | // one new character, treat it like any other new character received, discarding the buffer |
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165 | // |
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166 | buff.b[0] = buff.b[buffoffset-1]; |
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167 | buffoffset = 1; |
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168 | // fall through to normal processing |
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169 | } |
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170 | else |
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171 | { |
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172 | // discard even the newly received data and start listening anew |
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173 | // |
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174 | buffoffset = 0; |
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175 | continue; |
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176 | } |
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177 | } |
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178 | |
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179 | lasttick = GetTime(); |
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180 | |
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181 | // |
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182 | // No work currently to do, look at each character as they come in... |
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183 | // |
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184 | if( !readto ) |
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185 | { |
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186 | if( (buff.b[0] & SERIAL_COMMAND_HEADERMASK) == SERIAL_COMMAND_HEADER ) |
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187 | { |
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188 | // |
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189 | // Found our command header byte to start a commnad sequence, read the next 7 and evaluate |
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190 | // |
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191 | readto = 8; |
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192 | continue; |
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193 | } |
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194 | else |
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195 | { |
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196 | // |
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197 | // Spurious characters, discard |
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198 | // |
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199 | if( verboseLevel >= 2 ) |
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200 | { |
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201 | if( buff.b[0] >= 0x20 && buff.b[0] <= 0x7e ) |
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202 | log( 2, "Spurious: [%d:%c]", buff.b[0], buff.b[0] ); |
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203 | else |
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204 | log( 2, "Spurious: [%d]", buff.b[0] ); |
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205 | } |
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206 | buffoffset = 0; |
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207 | continue; |
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208 | } |
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209 | } |
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210 | |
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211 | // |
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212 | // Partial packet received, keep reading... |
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213 | // |
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214 | if( readto && buffoffset < readto ) |
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215 | continue; |
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216 | |
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217 | // |
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218 | // Read 512 bytes from serial port, only one command reads that many characters: Write Sector |
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219 | // |
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220 | if( buffoffset == readto && readto == 514 ) |
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221 | { |
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222 | buffoffset = readto = 0; |
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223 | if( (crc = checksum( &buff.w[0], 256 )) != buff.w[256] ) |
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224 | { |
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225 | log( 0, "Bad Write Sector Checksum" ); |
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226 | continue; |
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227 | } |
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228 | |
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229 | if( img->readOnly ) |
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230 | { |
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231 | log( 1, "Attempt to write to read-only image" ); |
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232 | continue; |
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233 | } |
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234 | |
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235 | img->seekSector( mylba + workOffset ); |
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236 | img->writeSector( &buff.w[0] ); |
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237 | |
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238 | // |
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239 | // Echo back the CRC |
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240 | // |
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241 | if( !serial->writeCharacters( &buff.w[256], 2 ) ) |
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242 | break; |
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243 | |
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244 | workOffset++; |
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245 | workCount--; |
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246 | |
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247 | if( workCount ) |
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248 | readto = 1; // looking for continuation ACK |
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249 | } |
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250 | |
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251 | // |
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252 | // 8 byte command received, or a continuation of the previous command |
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253 | // |
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254 | else if( (buffoffset == readto && readto == 8) || |
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255 | (buffoffset == readto && readto == 1 && workCount) ) |
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256 | { |
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257 | buffoffset = readto = 0; |
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258 | if( workCount ) |
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259 | { |
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260 | if( verboseLevel > 1 ) |
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261 | log( 2, " Continuation: Offset=%u, Checksum=%04x", workOffset-1, buff.w[256] ); |
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262 | |
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263 | // |
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264 | // Continuation... |
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265 | // |
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266 | if( buff.b[0] != (workCount-0) ) |
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267 | { |
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268 | log( 0, "Continue Fault: Received=%d, Expected=%d", buff.b[0], workCount ); |
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269 | workCount = 0; |
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270 | continue; |
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271 | } |
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272 | } |
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273 | else |
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274 | { |
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275 | // |
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276 | // New Command... |
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277 | // |
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278 | if( (crc = checksum( &buff.w[0], 3 )) != buff.w[3] ) |
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279 | { |
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280 | log( 0, "Bad Command Checksum: %02x %02x %02x %02x %02x %02x %02x %02x, Checksum=%04x", |
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281 | buff.b[0], buff.b[1], buff.b[2], buff.b[3], buff.b[4], buff.b[5], buff.b[6], buff.b[7], crc); |
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282 | continue; |
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283 | } |
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284 | |
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285 | img = (buff.inquire.driveAndHead & ATA_DriveAndHead_Drive) ? image1 : image0; |
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286 | |
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287 | workCommand = buff.chs.command & SERIAL_COMMAND_RWMASK; |
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288 | |
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289 | if( (workCommand != SERIAL_COMMAND_INQUIRE) && (buff.chs.driveAndHead & ATA_COMMAND_LBA) ) |
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290 | { |
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291 | mylba = ((((unsigned long) buff.lba.bits24) & ATA_COMMAND_HEADMASK) << 24) |
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292 | | (((unsigned long) buff.lba.bits16) << 16) |
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293 | | (((unsigned long) buff.lba.bits08) << 8) |
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294 | | ((unsigned long) buff.lba.bits00); |
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295 | } |
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296 | else |
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297 | { |
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298 | cyl = buff.chs.cylinder; |
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299 | sect = buff.chs.sector; |
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300 | head = (buff.chs.driveAndHead & ATA_COMMAND_HEADMASK); |
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301 | mylba = img ? (((cyl*img->head + head)*img->sect) + sect-1) : 0; |
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302 | } |
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303 | |
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304 | workOffset = 0; |
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305 | workCount = buff.chs.count; |
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306 | |
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307 | if( verboseLevel > 0 ) |
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308 | { |
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309 | char *comStr = (workCommand & SERIAL_COMMAND_WRITE ? "Write" : "Read"); |
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310 | |
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311 | if( workCommand == SERIAL_COMMAND_INQUIRE ) |
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312 | log( 1, "Inquire %d: Client Port=0x%x, Client Baud=%s", img == image0 ? 0 : 1, |
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313 | ((unsigned short) buff.inquire.port) << 2, |
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314 | baudRateMatchDivisor( buff.inquire.baud )->display ); |
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315 | else if( buff.chs.driveAndHead & ATA_COMMAND_LBA ) |
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316 | log( 1, "%s %d: LBA=%u, Count=%u", comStr, img == image0 ? 0 : 1, |
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317 | mylba, workCount ); |
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318 | else |
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319 | log( 1, "%s %d: Cylinder=%u, Sector=%u, Head=%u, Count=%u, LBA=%u", comStr, img == image0 ? 0 : 1, |
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320 | cyl, sect, head, workCount, mylba ); |
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321 | } |
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322 | |
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323 | if( !img ) |
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324 | { |
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325 | log( 1, " No slave drive provided" ); |
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326 | workCount = 0; |
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327 | continue; |
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328 | } |
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329 | |
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330 | if( (workCommand & SERIAL_COMMAND_WRITE) && img->readOnly ) |
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331 | { |
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332 | log( 1, " Write attempt to Read Only disk" ); |
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333 | workCount = 0; |
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334 | continue; |
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335 | } |
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336 | |
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337 | if( verboseLevel > 0 && workCount > 100 ) |
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338 | perfTimer = GetTime(); |
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339 | } |
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340 | |
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341 | if( workCount && (workCommand == (SERIAL_COMMAND_WRITE | SERIAL_COMMAND_READWRITE)) ) |
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342 | { |
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343 | // |
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344 | // Write command... Setup to receive a sector |
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345 | // |
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346 | readto = 514; |
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347 | } |
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348 | else |
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349 | { |
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350 | // |
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351 | // Inquire command... |
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352 | // |
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353 | if( workCommand == SERIAL_COMMAND_INQUIRE ) |
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354 | { |
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355 | unsigned char localScan; |
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356 | |
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357 | if( serial->speedEmulation && |
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358 | buff.inquire.baud != serial->baudRate->divisor ) |
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359 | { |
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360 | log( 1, " Ignoring Inquire with wrong baud rate" ); |
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361 | workCount = 0; |
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362 | continue; |
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363 | } |
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364 | |
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365 | localScan = buff.inquire.scan; // need to do this before the call to |
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366 | // img->respondInquire, as it will clear the buff |
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367 | img->respondInquire( &buff.w[0], buff.inquirePacked.PackedPortAndBaud, |
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368 | serial->baudRate, |
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369 | ((unsigned short) buff.inquire.port) << 2, |
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370 | (img == image1 && lastScan) || buff.inquire.scan ); |
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371 | lastScan = localScan; |
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372 | } |
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373 | // |
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374 | // Read command... |
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375 | // |
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376 | else |
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377 | { |
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378 | img->seekSector( mylba + workOffset ); |
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379 | img->readSector( &buff.w[0] ); |
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380 | lastScan = 0; |
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381 | } |
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382 | |
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383 | buff.w[256] = checksum( &buff.w[0], 256 ); |
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384 | |
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385 | if( !serial->writeCharacters( &buff.w[0], 514 ) ) |
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386 | break; |
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387 | |
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388 | if( verboseLevel >= 3 ) |
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389 | logBuff( " Sending: ", 514, 514, verboseLevel ); |
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390 | |
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391 | workCount--; |
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392 | workOffset++; |
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393 | |
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394 | if( workCount ) |
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395 | readto = 1; // looking for continuation ACK |
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396 | } |
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397 | } |
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398 | |
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399 | if( workCount == 0 && workOffset > 100 ) |
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400 | log( 1, " Performance: %.2lf bytes per second", (512.0 * workOffset) / (GetTime() - perfTimer) * 1000.0 ); |
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401 | } |
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402 | } |
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403 | |
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404 | |
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