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/*
* Copyright (c) 2008 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Gabe Black
*/
#include "dev/x86/i82094aa.hh"
#include <list>
#include "arch/x86/interrupts.hh"
#include "arch/x86/intmessage.hh"
#include "cpu/base.hh"
#include "debug/I82094AA.hh"
#include "dev/x86/i8259.hh"
#include "mem/packet.hh"
#include "mem/packet_access.hh"
#include "sim/system.hh"
X86ISA::I82094AA::I82094AA(Params *p)
: BasicPioDevice(p, 20), extIntPic(p->external_int_pic),
lowestPriorityOffset(0),
intMasterPort(name() + ".int_master", this, this, p->int_latency)
{
// This assumes there's only one I/O APIC in the system and since the apic
// id is stored in a 8-bit field with 0xff meaning broadcast, the id must
// be less than 0xff
assert(p->apic_id < 0xff);
initialApicId = id = p->apic_id;
arbId = id;
regSel = 0;
RedirTableEntry entry = 0;
entry.mask = 1;
for (int i = 0; i < TableSize; i++) {
redirTable[i] = entry;
pinStates[i] = false;
}
for (int i = 0; i < p->port_inputs_connection_count; i++)
inputs.push_back(new IntSinkPin<I82094AA>(
csprintf("%s.inputs[%d]", name(), i), i, this));
}
void
X86ISA::I82094AA::init()
{
// The io apic must register its address range with its pio port via
// the piodevice init() function.
BasicPioDevice::init();
// If the master port isn't connected, we can't send interrupts anywhere.
panic_if(!intMasterPort.isConnected(),
"Int port not connected to anything!");
}
Port &
X86ISA::I82094AA::getPort(const std::string &if_name, PortID idx)
{
if (if_name == "int_master")
return intMasterPort;
if (if_name == "inputs")
return *inputs.at(idx);
else
return BasicPioDevice::getPort(if_name, idx);
}
Tick
X86ISA::I82094AA::read(PacketPtr pkt)
{
assert(pkt->getSize() == 4);
Addr offset = pkt->getAddr() - pioAddr;
switch(offset) {
case 0:
pkt->setLE<uint32_t>(regSel);
break;
case 16:
pkt->setLE<uint32_t>(readReg(regSel));
break;
default:
panic("Illegal read from I/O APIC.\n");
}
pkt->makeAtomicResponse();
return pioDelay;
}
Tick
X86ISA::I82094AA::write(PacketPtr pkt)
{
assert(pkt->getSize() == 4);
Addr offset = pkt->getAddr() - pioAddr;
switch(offset) {
case 0:
regSel = pkt->getLE<uint32_t>();
break;
case 16:
writeReg(regSel, pkt->getLE<uint32_t>());
break;
default:
panic("Illegal write to I/O APIC.\n");
}
pkt->makeAtomicResponse();
return pioDelay;
}
void
X86ISA::I82094AA::writeReg(uint8_t offset, uint32_t value)
{
if (offset == 0x0) {
id = bits(value, 31, 24);
} else if (offset == 0x1) {
// The IOAPICVER register is read only.
} else if (offset == 0x2) {
arbId = bits(value, 31, 24);
} else if (offset >= 0x10 && offset <= (0x10 + TableSize * 2)) {
int index = (offset - 0x10) / 2;
if (offset % 2) {
redirTable[index].topDW = value;
redirTable[index].topReserved = 0;
} else {
redirTable[index].bottomDW = value;
redirTable[index].bottomReserved = 0;
}
} else {
warn("Access to undefined I/O APIC register %#x.\n", offset);
}
DPRINTF(I82094AA,
"Wrote %#x to I/O APIC register %#x .\n", value, offset);
}
uint32_t
X86ISA::I82094AA::readReg(uint8_t offset)
{
uint32_t result = 0;
if (offset == 0x0) {
result = id << 24;
} else if (offset == 0x1) {
result = ((TableSize - 1) << 16) | APICVersion;
} else if (offset == 0x2) {
result = arbId << 24;
} else if (offset >= 0x10 && offset <= (0x10 + TableSize * 2)) {
int index = (offset - 0x10) / 2;
if (offset % 2) {
result = redirTable[index].topDW;
} else {
result = redirTable[index].bottomDW;
}
} else {
warn("Access to undefined I/O APIC register %#x.\n", offset);
}
DPRINTF(I82094AA,
"Read %#x from I/O APIC register %#x.\n", result, offset);
return result;
}
void
X86ISA::I82094AA::signalInterrupt(int line)
{
DPRINTF(I82094AA, "Received interrupt %d.\n", line);
assert(line < TableSize);
RedirTableEntry entry = redirTable[line];
if (entry.mask) {
DPRINTF(I82094AA, "Entry was masked.\n");
return;
} else {
TriggerIntMessage message = 0;
message.destination = entry.dest;
if (entry.deliveryMode == DeliveryMode::ExtInt) {
assert(extIntPic);
message.vector = extIntPic->getVector();
} else {
message.vector = entry.vector;
}
message.deliveryMode = entry.deliveryMode;
message.destMode = entry.destMode;
message.level = entry.polarity;
message.trigger = entry.trigger;
std::list<int> apics;
int numContexts = sys->numContexts();
if (message.destMode == 0) {
if (message.deliveryMode == DeliveryMode::LowestPriority) {
panic("Lowest priority delivery mode from the "
"IO APIC aren't supported in physical "
"destination mode.\n");
}
if (message.destination == 0xFF) {
for (int i = 0; i < numContexts; i++) {
apics.push_back(i);
}
} else {
apics.push_back(message.destination);
}
} else {
for (int i = 0; i < numContexts; i++) {
BaseInterrupts *base_int = sys->getThreadContext(i)->
getCpuPtr()->getInterruptController(0);
auto *localApic = dynamic_cast<Interrupts *>(base_int);
if ((localApic->readReg(APIC_LOGICAL_DESTINATION) >> 24) &
message.destination) {
apics.push_back(localApic->getInitialApicId());
}
}
if (message.deliveryMode == DeliveryMode::LowestPriority &&
apics.size()) {
// The manual seems to suggest that the chipset just does
// something reasonable for these instead of actually using
// state from the local APIC. We'll just rotate an offset
// through the set of APICs selected above.
uint64_t modOffset = lowestPriorityOffset % apics.size();
lowestPriorityOffset++;
auto apicIt = apics.begin();
while (modOffset--) {
apicIt++;
assert(apicIt != apics.end());
}
int selected = *apicIt;
apics.clear();
apics.push_back(selected);
}
}
for (auto id: apics) {
PacketPtr pkt = buildIntTriggerPacket(id, message);
intMasterPort.sendMessage(pkt, sys->isTimingMode());
}
}
}
void
X86ISA::I82094AA::raiseInterruptPin(int number)
{
assert(number < TableSize);
if (!pinStates[number])
signalInterrupt(number);
pinStates[number] = true;
}
void
X86ISA::I82094AA::lowerInterruptPin(int number)
{
assert(number < TableSize);
pinStates[number] = false;
}
void
X86ISA::I82094AA::serialize(CheckpointOut &cp) const
{
uint64_t* redirTableArray = (uint64_t*)redirTable;
SERIALIZE_SCALAR(regSel);
SERIALIZE_SCALAR(initialApicId);
SERIALIZE_SCALAR(id);
SERIALIZE_SCALAR(arbId);
SERIALIZE_SCALAR(lowestPriorityOffset);
SERIALIZE_ARRAY(redirTableArray, TableSize);
SERIALIZE_ARRAY(pinStates, TableSize);
}
void
X86ISA::I82094AA::unserialize(CheckpointIn &cp)
{
uint64_t redirTableArray[TableSize];
UNSERIALIZE_SCALAR(regSel);
UNSERIALIZE_SCALAR(initialApicId);
UNSERIALIZE_SCALAR(id);
UNSERIALIZE_SCALAR(arbId);
UNSERIALIZE_SCALAR(lowestPriorityOffset);
UNSERIALIZE_ARRAY(redirTableArray, TableSize);
UNSERIALIZE_ARRAY(pinStates, TableSize);
for (int i = 0; i < TableSize; i++) {
redirTable[i] = (RedirTableEntry)redirTableArray[i];
}
}
X86ISA::I82094AA *
I82094AAParams::create()
{
return new X86ISA::I82094AA(this);
}