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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 "arch/x86/intmessage.hh"
#include "dev/x86/i82094aa.hh"
#include "mem/packet.hh"
#include "mem/packet_access.hh"
#include "sim/system.hh"
X86ISA::I82094AA::I82094AA(Params *p) : PioDevice(p), IntDev(this),
latency(p->pio_latency), pioAddr(p->pio_addr)
{
// This assumes there's only one I/O APIC in the system
id = sys->getNumCPUs();
assert(id <= 0xf);
arbId = id;
regSel = 0;
memset(redirTable, 0, sizeof(RedirTableEntry) * TableSize);
}
Tick
X86ISA::I82094AA::read(PacketPtr pkt)
{
assert(pkt->getSize() == 4);
Addr offset = pkt->getAddr() - pioAddr;
switch(offset) {
case 0:
pkt->set<uint32_t>(regSel);
break;
case 16:
pkt->set<uint32_t>(readReg(regSel));
break;
default:
panic("Illegal read from I/O APIC.\n");
}
return latency;
}
Tick
X86ISA::I82094AA::write(PacketPtr pkt)
{
assert(pkt->getSize() == 4);
Addr offset = pkt->getAddr() - pioAddr;
switch(offset) {
case 0:
regSel = pkt->get<uint32_t>();
break;
case 16:
writeReg(regSel, pkt->get<uint32_t>());
break;
default:
panic("Illegal write to I/O APIC.\n");
}
return latency;
}
void
X86ISA::I82094AA::writeReg(uint8_t offset, uint32_t value)
{
if (offset == 0x0) {
id = bits(value, 27, 24);
} else if (offset == 0x1) {
// The IOAPICVER register is read only.
} else if (offset == 0x2) {
arbId = bits(value, 27, 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 {
if (DTRACE(I82094AA)) {
switch(entry.deliveryMode) {
case 0:
DPRINTF(I82094AA, "Delivery mode is: Fixed.\n");
break;
case 1:
DPRINTF(I82094AA, "Delivery mode is: Lowest Priority.\n");
break;
case 2:
DPRINTF(I82094AA, "Delivery mode is: SMI.\n");
break;
case 3:
fatal("Tried to use reserved delivery mode "
"for IO APIC entry %d.\n", line);
break;
case 4:
DPRINTF(I82094AA, "Delivery mode is: NMI.\n");
break;
case 5:
DPRINTF(I82094AA, "Delivery mode is: INIT.\n");
break;
case 6:
fatal("Tried to use reserved delivery mode "
"for IO APIC entry %d.\n", line);
break;
case 7:
DPRINTF(I82094AA, "Delivery mode is: ExtINT.\n");
break;
}
DPRINTF(I82094AA, "Vector is %#x.\n", entry.vector);
}
TriggerIntMessage message;
message.destination = entry.dest;
message.vector = entry.vector;
message.deliveryMode = entry.deliveryMode;
message.destMode = entry.destMode;
if (entry.destMode == 0) {
DPRINTF(I82094AA,
"Sending interrupt to APIC ID %d.\n", entry.dest);
PacketPtr pkt = buildIntRequest(entry.dest, message);
if (sys->getMemoryMode() == Enums::timing)
intPort->sendMessageTiming(pkt, latency);
else if (sys->getMemoryMode() == Enums::atomic)
intPort->sendMessageAtomic(pkt);
else
panic("Unrecognized memory mode.\n");
} else {
DPRINTF(I82094AA, "Sending interrupts to APIC IDs:"
"%s%s%s%s%s%s%s%s\n",
bits((int)entry.dest, 0) ? " 0": "",
bits((int)entry.dest, 1) ? " 1": "",
bits((int)entry.dest, 2) ? " 2": "",
bits((int)entry.dest, 3) ? " 3": "",
bits((int)entry.dest, 4) ? " 4": "",
bits((int)entry.dest, 5) ? " 5": "",
bits((int)entry.dest, 6) ? " 6": "",
bits((int)entry.dest, 7) ? " 7": ""
);
uint8_t dests = entry.dest;
uint8_t id = 0;
while(dests) {
if (dests & 0x1) {
PacketPtr pkt = buildIntRequest(id, message);
if (sys->getMemoryMode() == Enums::timing)
intPort->sendMessageTiming(pkt, latency);
else if (sys->getMemoryMode() == Enums::atomic)
intPort->sendMessageAtomic(pkt);
else
panic("Unrecognized memory mode.\n");
}
dests >>= 1;
id++;
}
}
}
}
X86ISA::I82094AA *
I82094AAParams::create()
{
return new X86ISA::I82094AA(this);
}
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