[209] | 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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[376] | 8 | // |
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[526] | 9 | // XTIDE Universal BIOS and Associated Tools |
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| 10 | // Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 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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[526] | 16 | // |
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[376] | 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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[526] | 20 | // GNU General Public License for more details. |
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[376] | 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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[209] | 24 | #include "library.h" |
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| 25 | #include <memory.h> |
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| 26 | #include <string.h> |
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[219] | 27 | #include <stdio.h> |
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[209] | 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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[233] | 49 | unsigned char scan; |
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| 50 | unsigned char port; |
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| 51 | unsigned char baud; |
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[209] | 52 | } inquire; |
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[277] | 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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[209] | 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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[219] | 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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[210] | 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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[213] | 84 | if( verboseLevel == 5 || (verboseLevel >= 3 && buffoffset == readto) ) |
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[210] | 85 | { |
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[213] | 86 | if( verboseLevel == 3 && buffoffset > 11 ) |
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[210] | 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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[211] | 96 | log( 3, "%s%s", message, logBuff ); |
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[210] | 97 | } |
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| 98 | } |
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| 99 | |
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[219] | 100 | void processRequests( SerialAccess *serial, Image *image0, Image *image1, int timeoutEnabled, int verboseLevel ) |
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[209] | 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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[210] | 114 | unsigned long perfTimer; |
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[233] | 115 | unsigned char lastScan; |
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[209] | 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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[233] | 122 | lastScan = 0; |
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[215] | 123 | |
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[258] | 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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[209] | 134 | lasttick = GetTime(); |
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| 135 | |
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[215] | 136 | while( (len = serial->readCharacters( &buff.b[buffoffset], (readto ? readto-buffoffset : 1) )) ) |
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[209] | 137 | { |
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| 138 | buffoffset += len; |
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| 139 | |
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[210] | 140 | // |
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| 141 | // For debugging, look at the incoming packet |
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| 142 | // |
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[213] | 143 | if( verboseLevel >= 3 ) |
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[210] | 144 | logBuff( " Received: ", buffoffset, readto, verboseLevel ); |
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[209] | 145 | |
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[215] | 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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[209] | 149 | |
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[215] | 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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[209] | 177 | } |
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| 178 | |
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| 179 | lasttick = GetTime(); |
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| 180 | |
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[526] | 181 | // |
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[210] | 182 | // No work currently to do, look at each character as they come in... |
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| 183 | // |
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[215] | 184 | if( !readto ) |
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[209] | 185 | { |
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[215] | 186 | if( (buff.b[0] & SERIAL_COMMAND_HEADERMASK) == SERIAL_COMMAND_HEADER ) |
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[209] | 187 | { |
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[210] | 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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[209] | 191 | readto = 8; |
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[210] | 192 | continue; |
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[209] | 193 | } |
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| 194 | else |
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| 195 | { |
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[210] | 196 | // |
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| 197 | // Spurious characters, discard |
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| 198 | // |
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[209] | 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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[211] | 202 | log( 2, "Spurious: [%d:%c]", buff.b[0], buff.b[0] ); |
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[209] | 203 | else |
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[211] | 204 | log( 2, "Spurious: [%d]", buff.b[0] ); |
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[209] | 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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[210] | 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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[209] | 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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[211] | 225 | log( 0, "Bad Write Sector Checksum" ); |
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[209] | 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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[211] | 231 | log( 1, "Attempt to write to read-only image" ); |
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[209] | 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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[210] | 238 | // |
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| 239 | // Echo back the CRC |
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| 240 | // |
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[219] | 241 | if( !serial->writeCharacters( &buff.w[256], 2 ) ) |
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| 242 | break; |
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[209] | 243 | |
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| 244 | workOffset++; |
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| 245 | workCount--; |
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[215] | 246 | |
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| 247 | if( workCount ) |
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| 248 | readto = 1; // looking for continuation ACK |
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[209] | 249 | } |
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| 250 | |
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[210] | 251 | // |
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[209] | 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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[215] | 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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[210] | 263 | // |
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| 264 | // Continuation... |
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| 265 | // |
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[209] | 266 | if( buff.b[0] != (workCount-0) ) |
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| 267 | { |
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[211] | 268 | log( 0, "Continue Fault: Received=%d, Expected=%d", buff.b[0], workCount ); |
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[209] | 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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[210] | 275 | // |
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| 276 | // New Command... |
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| 277 | // |
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[209] | 278 | if( (crc = checksum( &buff.w[0], 3 )) != buff.w[3] ) |
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| 279 | { |
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[215] | 280 | log( 0, "Bad Command Checksum: %02x %02x %02x %02x %02x %02x %02x %02x, Checksum=%04x", |
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[209] | 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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[215] | 285 | img = (buff.inquire.driveAndHead & ATA_DriveAndHead_Drive) ? image1 : image0; |
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[209] | 286 | |
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| 287 | workCommand = buff.chs.command & SERIAL_COMMAND_RWMASK; |
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| 288 | |
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[217] | 289 | if( (workCommand != SERIAL_COMMAND_INQUIRE) && (buff.chs.driveAndHead & ATA_COMMAND_LBA) ) |
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[209] | 290 | { |
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[526] | 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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[209] | 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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[215] | 301 | mylba = img ? (((cyl*img->head + head)*img->sect) + sect-1) : 0; |
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[209] | 302 | } |
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| 303 | |
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[215] | 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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[233] | 313 | ((unsigned short) buff.inquire.port) << 2, |
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| 314 | baudRateMatchDivisor( buff.inquire.baud )->display ); |
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[217] | 315 | else if( buff.chs.driveAndHead & ATA_COMMAND_LBA ) |
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[215] | 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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[209] | 330 | if( (workCommand & SERIAL_COMMAND_WRITE) && img->readOnly ) |
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| 331 | { |
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[215] | 332 | log( 1, " Write attempt to Read Only disk" ); |
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| 333 | workCount = 0; |
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[209] | 334 | continue; |
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| 335 | } |
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| 336 | |
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[213] | 337 | if( verboseLevel > 0 && workCount > 100 ) |
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[210] | 338 | perfTimer = GetTime(); |
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[209] | 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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[210] | 343 | // |
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| 344 | // Write command... Setup to receive a sector |
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| 345 | // |
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[209] | 346 | readto = 514; |
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| 347 | } |
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[526] | 348 | else |
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[209] | 349 | { |
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[210] | 350 | // |
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| 351 | // Inquire command... |
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| 352 | // |
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[209] | 353 | if( workCommand == SERIAL_COMMAND_INQUIRE ) |
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| 354 | { |
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[233] | 355 | unsigned char localScan; |
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| 356 | |
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[526] | 357 | if( serial->speedEmulation && |
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[233] | 358 | buff.inquire.baud != serial->baudRate->divisor ) |
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[209] | 359 | { |
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[215] | 360 | log( 1, " Ignoring Inquire with wrong baud rate" ); |
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[209] | 361 | workCount = 0; |
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| 362 | continue; |
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| 363 | } |
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| 364 | |
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[526] | 365 | localScan = buff.inquire.scan; // need to do this before the call to |
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[233] | 366 | // img->respondInquire, as it will clear the buff |
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[526] | 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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[233] | 370 | (img == image1 && lastScan) || buff.inquire.scan ); |
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| 371 | lastScan = localScan; |
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[209] | 372 | } |
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[210] | 373 | // |
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| 374 | // Read command... |
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| 375 | // |
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[209] | 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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[233] | 380 | lastScan = 0; |
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[209] | 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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[219] | 385 | if( !serial->writeCharacters( &buff.w[0], 514 ) ) |
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| 386 | break; |
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[209] | 387 | |
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[215] | 388 | if( verboseLevel >= 3 ) |
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| 389 | logBuff( " Sending: ", 514, 514, verboseLevel ); |
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| 390 | |
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[209] | 391 | workCount--; |
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| 392 | workOffset++; |
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[215] | 393 | |
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| 394 | if( workCount ) |
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| 395 | readto = 1; // looking for continuation ACK |
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[209] | 396 | } |
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[210] | 397 | } |
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[209] | 398 | |
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[215] | 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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[209] | 401 | } |
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| 402 | } |
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[210] | 403 | |
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| 404 | |
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