i82094aa.cc revision 6138
1/* 2 * Copyright (c) 2008 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Gabe Black 29 */ 30 31#include "arch/x86/interrupts.hh" 32#include "arch/x86/intmessage.hh" 33#include "dev/x86/i82094aa.hh" 34#include "dev/x86/i8259.hh" 35#include "mem/packet.hh" 36#include "mem/packet_access.hh" 37#include "sim/system.hh" 38 39X86ISA::I82094AA::I82094AA(Params *p) : PioDevice(p), IntDev(this), 40 latency(p->pio_latency), pioAddr(p->pio_addr), 41 extIntPic(p->external_int_pic) 42{ 43 // This assumes there's only one I/O APIC in the system 44 initialApicId = id = p->apic_id; 45 assert(id <= 0xf); 46 arbId = id; 47 regSel = 0; 48 RedirTableEntry entry = 0; 49 entry.mask = 1; 50 for (int i = 0; i < TableSize; i++) { 51 redirTable[i] = entry; 52 pinStates[i] = false; 53 } 54} 55 56Tick 57X86ISA::I82094AA::read(PacketPtr pkt) 58{ 59 assert(pkt->getSize() == 4); 60 Addr offset = pkt->getAddr() - pioAddr; 61 switch(offset) { 62 case 0: 63 pkt->set<uint32_t>(regSel); 64 break; 65 case 16: 66 pkt->set<uint32_t>(readReg(regSel)); 67 break; 68 default: 69 panic("Illegal read from I/O APIC.\n"); 70 } 71 pkt->makeAtomicResponse(); 72 return latency; 73} 74 75Tick 76X86ISA::I82094AA::write(PacketPtr pkt) 77{ 78 assert(pkt->getSize() == 4); 79 Addr offset = pkt->getAddr() - pioAddr; 80 switch(offset) { 81 case 0: 82 regSel = pkt->get<uint32_t>(); 83 break; 84 case 16: 85 writeReg(regSel, pkt->get<uint32_t>()); 86 break; 87 default: 88 panic("Illegal write to I/O APIC.\n"); 89 } 90 pkt->makeAtomicResponse(); 91 return latency; 92} 93 94void 95X86ISA::I82094AA::writeReg(uint8_t offset, uint32_t value) 96{ 97 if (offset == 0x0) { 98 id = bits(value, 27, 24); 99 } else if (offset == 0x1) { 100 // The IOAPICVER register is read only. 101 } else if (offset == 0x2) { 102 arbId = bits(value, 27, 24); 103 } else if (offset >= 0x10 && offset <= (0x10 + TableSize * 2)) { 104 int index = (offset - 0x10) / 2; 105 if (offset % 2) { 106 redirTable[index].topDW = value; 107 redirTable[index].topReserved = 0; 108 } else { 109 redirTable[index].bottomDW = value; 110 redirTable[index].bottomReserved = 0; 111 } 112 } else { 113 warn("Access to undefined I/O APIC register %#x.\n", offset); 114 } 115 DPRINTF(I82094AA, 116 "Wrote %#x to I/O APIC register %#x .\n", value, offset); 117} 118 119uint32_t 120X86ISA::I82094AA::readReg(uint8_t offset) 121{ 122 uint32_t result = 0; 123 if (offset == 0x0) { 124 result = id << 24; 125 } else if (offset == 0x1) { 126 result = ((TableSize - 1) << 16) | APICVersion; 127 } else if (offset == 0x2) { 128 result = arbId << 24; 129 } else if (offset >= 0x10 && offset <= (0x10 + TableSize * 2)) { 130 int index = (offset - 0x10) / 2; 131 if (offset % 2) { 132 result = redirTable[index].topDW; 133 } else { 134 result = redirTable[index].bottomDW; 135 } 136 } else { 137 warn("Access to undefined I/O APIC register %#x.\n", offset); 138 } 139 DPRINTF(I82094AA, 140 "Read %#x from I/O APIC register %#x.\n", result, offset); 141 return result; 142} 143 144void 145X86ISA::I82094AA::signalInterrupt(int line) 146{ 147 DPRINTF(I82094AA, "Received interrupt %d.\n", line); 148 assert(line < TableSize); 149 RedirTableEntry entry = redirTable[line]; 150 if (entry.mask) { 151 DPRINTF(I82094AA, "Entry was masked.\n"); 152 return; 153 } else { 154 TriggerIntMessage message; 155 message.destination = entry.dest; 156 if (entry.deliveryMode == DeliveryMode::ExtInt) { 157 assert(extIntPic); 158 message.vector = extIntPic->getVector(); 159 } else { 160 message.vector = entry.vector; 161 } 162 message.deliveryMode = entry.deliveryMode; 163 message.destMode = entry.destMode; 164 message.level = entry.polarity; 165 message.trigger = entry.trigger; 166 ApicList apics; 167 int numContexts = sys->numContexts(); 168 if (message.destMode == 0) { 169 if (message.deliveryMode == DeliveryMode::LowestPriority) { 170 panic("Lowest priority delivery mode from the " 171 "IO APIC aren't supported in physical " 172 "destination mode.\n"); 173 } 174 if (message.destination == 0xFF) { 175 for (int i = 0; i < numContexts; i++) { 176 apics.push_back(i); 177 } 178 } else { 179 apics.push_back(message.destination); 180 } 181 } else { 182 for (int i = 0; i < numContexts; i++) { 183 std::map<int, Interrupts *>::iterator localApicIt = 184 localApics.find(i); 185 assert(localApicIt != localApics.end()); 186 Interrupts *localApic = localApicIt->second; 187 if ((localApic->readReg(APIC_LOGICAL_DESTINATION) >> 24) & 188 message.destination) { 189 apics.push_back(localApicIt->first); 190 } 191 } 192 if (message.deliveryMode == DeliveryMode::LowestPriority) { 193 panic("Lowest priority delivery mode is not implemented.\n"); 194 } 195 } 196 intPort->sendMessage(apics, message, 197 sys->getMemoryMode() == Enums::timing); 198 } 199} 200 201void 202X86ISA::I82094AA::raiseInterruptPin(int number) 203{ 204 assert(number < TableSize); 205 if (!pinStates[number]) 206 signalInterrupt(number); 207 pinStates[number] = true; 208} 209 210void 211X86ISA::I82094AA::lowerInterruptPin(int number) 212{ 213 assert(number < TableSize); 214 pinStates[number] = false; 215} 216 217void 218X86ISA::I82094AA::registerLocalApic(int initialId, Interrupts *localApic) 219{ 220 assert(localApic); 221 localApics[initialId] = localApic; 222} 223 224X86ISA::I82094AA * 225I82094AAParams::create() 226{ 227 return new X86ISA::I82094AA(this); 228} 229