| /* |
| * Copyright (c) 2004-2005 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/i8259.hh" |
| |
| #include "base/bitfield.hh" |
| #include "debug/I8259.hh" |
| #include "dev/x86/i82094aa.hh" |
| #include "mem/packet.hh" |
| #include "mem/packet_access.hh" |
| |
| X86ISA::I8259::I8259(Params * p) |
| : BasicPioDevice(p, 2), IntDevice(this), |
| latency(p->pio_latency), output(p->output), |
| mode(p->mode), slave(p->slave), |
| IRR(0), ISR(0), IMR(0), |
| readIRR(true), initControlWord(0), autoEOI(false) |
| { |
| for (int i = 0; i < NumLines; i++) |
| pinStates[i] = false; |
| } |
| |
| Tick |
| X86ISA::I8259::read(PacketPtr pkt) |
| { |
| assert(pkt->getSize() == 1); |
| switch(pkt->getAddr() - pioAddr) |
| { |
| case 0x0: |
| if (readIRR) { |
| DPRINTF(I8259, "Reading IRR as %#x.\n", IRR); |
| pkt->set(IRR); |
| } else { |
| DPRINTF(I8259, "Reading ISR as %#x.\n", ISR); |
| pkt->set(ISR); |
| } |
| break; |
| case 0x1: |
| DPRINTF(I8259, "Reading IMR as %#x.\n", IMR); |
| pkt->set(IMR); |
| break; |
| } |
| pkt->makeAtomicResponse(); |
| return latency; |
| } |
| |
| Tick |
| X86ISA::I8259::write(PacketPtr pkt) |
| { |
| assert(pkt->getSize() == 1); |
| uint8_t val = pkt->get<uint8_t>(); |
| switch (pkt->getAddr() - pioAddr) { |
| case 0x0: |
| if (bits(val, 4)) { |
| DPRINTF(I8259, "Received initialization command word 1.\n"); |
| IMR = 0; |
| edgeTriggered = bits(val, 3); |
| DPRINTF(I8259, "%s triggered mode.\n", |
| edgeTriggered ? "Edge" : "Level"); |
| cascadeMode = !bits(val, 1); |
| DPRINTF(I8259, "%s mode.\n", |
| cascadeMode ? "Cascade" : "Single"); |
| expectICW4 = bits(val, 0); |
| if (!expectICW4) { |
| autoEOI = false; |
| } |
| initControlWord = 1; |
| DPRINTF(I8259, "Expecting %d more bytes.\n", expectICW4 ? 3 : 2); |
| } else if (bits(val, 4, 3) == 0) { |
| DPRINTF(I8259, "Received operation command word 2.\n"); |
| switch (bits(val, 7, 5)) { |
| case 0x0: |
| DPRINTF(I8259, |
| "Subcommand: Rotate in auto-EOI mode (clear).\n"); |
| break; |
| case 0x1: |
| { |
| int line = findMsbSet(ISR); |
| DPRINTF(I8259, "Subcommand: Nonspecific EOI on line %d.\n", |
| line); |
| handleEOI(line); |
| } |
| break; |
| case 0x2: |
| DPRINTF(I8259, "Subcommand: No operation.\n"); |
| break; |
| case 0x3: |
| { |
| int line = bits(val, 2, 0); |
| DPRINTF(I8259, "Subcommand: Specific EIO on line %d.\n", |
| line); |
| handleEOI(line); |
| } |
| break; |
| case 0x4: |
| DPRINTF(I8259, "Subcommand: Rotate in auto-EOI mode (set).\n"); |
| break; |
| case 0x5: |
| DPRINTF(I8259, "Subcommand: Rotate on nonspecific EOI.\n"); |
| break; |
| case 0x6: |
| DPRINTF(I8259, "Subcommand: Set priority command.\n"); |
| DPRINTF(I8259, "Lowest: IRQ%d Highest IRQ%d.\n", |
| bits(val, 2, 0), (bits(val, 2, 0) + 1) % 8); |
| break; |
| case 0x7: |
| DPRINTF(I8259, "Subcommand: Rotate on specific EOI.\n"); |
| DPRINTF(I8259, "Lowest: IRQ%d Highest IRQ%d.\n", |
| bits(val, 2, 0), (bits(val, 2, 0) + 1) % 8); |
| break; |
| } |
| } else if (bits(val, 4, 3) == 1) { |
| DPRINTF(I8259, "Received operation command word 3.\n"); |
| if (bits(val, 7)) { |
| DPRINTF(I8259, "%s special mask mode.\n", |
| bits(val, 6) ? "Set" : "Clear"); |
| } |
| if (bits(val, 1)) { |
| readIRR = bits(val, 0); |
| DPRINTF(I8259, "Read %s.\n", readIRR ? "IRR" : "ISR"); |
| } |
| } |
| break; |
| case 0x1: |
| switch (initControlWord) { |
| case 0x0: |
| DPRINTF(I8259, "Received operation command word 1.\n"); |
| DPRINTF(I8259, "Wrote IMR value %#x.\n", val); |
| IMR = val; |
| break; |
| case 0x1: |
| DPRINTF(I8259, "Received initialization command word 2.\n"); |
| vectorOffset = val & ~mask(3); |
| DPRINTF(I8259, "Responsible for vectors %#x-%#x.\n", |
| vectorOffset, vectorOffset | mask(3)); |
| if (cascadeMode) { |
| initControlWord++; |
| } else { |
| cascadeBits = 0; |
| initControlWord = 0; |
| } |
| break; |
| case 0x2: |
| DPRINTF(I8259, "Received initialization command word 3.\n"); |
| if (mode == Enums::I8259Master) { |
| DPRINTF(I8259, "Slaves attached to IRQs:%s%s%s%s%s%s%s%s\n", |
| bits(val, 0) ? " 0" : "", |
| bits(val, 1) ? " 1" : "", |
| bits(val, 2) ? " 2" : "", |
| bits(val, 3) ? " 3" : "", |
| bits(val, 4) ? " 4" : "", |
| bits(val, 5) ? " 5" : "", |
| bits(val, 6) ? " 6" : "", |
| bits(val, 7) ? " 7" : ""); |
| cascadeBits = val; |
| } else { |
| DPRINTF(I8259, "Slave ID is %d.\n", val & mask(3)); |
| cascadeBits = val & mask(3); |
| } |
| if (expectICW4) |
| initControlWord++; |
| else |
| initControlWord = 0; |
| break; |
| case 0x3: |
| DPRINTF(I8259, "Received initialization command word 4.\n"); |
| if (bits(val, 4)) { |
| DPRINTF(I8259, "Special fully nested mode.\n"); |
| } else { |
| DPRINTF(I8259, "Not special fully nested mode.\n"); |
| } |
| if (bits(val, 3) == 0) { |
| DPRINTF(I8259, "Nonbuffered.\n"); |
| } else if (bits(val, 2) == 0) { |
| DPRINTF(I8259, "Buffered.\n"); |
| } else { |
| DPRINTF(I8259, "Unrecognized buffer mode.\n"); |
| } |
| autoEOI = bits(val, 1); |
| DPRINTF(I8259, "%s End Of Interrupt.\n", |
| autoEOI ? "Automatic" : "Normal"); |
| |
| DPRINTF(I8259, "%s mode.\n", bits(val, 0) ? "80x86" : "MCX-80/85"); |
| initControlWord = 0; |
| break; |
| } |
| break; |
| } |
| pkt->makeAtomicResponse(); |
| return latency; |
| } |
| |
| void |
| X86ISA::I8259::handleEOI(int line) |
| { |
| ISR &= ~(1 << line); |
| // There may be an interrupt that was waiting which can |
| // now be sent. |
| if (IRR) |
| requestInterrupt(findMsbSet(IRR)); |
| } |
| |
| void |
| X86ISA::I8259::requestInterrupt(int line) |
| { |
| if (bits(ISR, 7, line) == 0) { |
| if (output) { |
| DPRINTF(I8259, "Propogating interrupt.\n"); |
| output->raise(); |
| //XXX This is a hack. |
| output->lower(); |
| } else { |
| warn("Received interrupt but didn't have " |
| "anyone to tell about it.\n"); |
| } |
| } |
| } |
| |
| void |
| X86ISA::I8259::signalInterrupt(int line) |
| { |
| DPRINTF(I8259, "Interrupt requested for line %d.\n", line); |
| if (line >= NumLines) |
| fatal("Line number %d doesn't exist. The max is %d.\n", |
| line, NumLines - 1); |
| if (bits(IMR, line)) { |
| DPRINTF(I8259, "Interrupt %d was masked.\n", line); |
| } else { |
| IRR |= 1 << line; |
| requestInterrupt(line); |
| } |
| } |
| |
| void |
| X86ISA::I8259::raiseInterruptPin(int number) |
| { |
| DPRINTF(I8259, "Interrupt signal raised for pin %d.\n", number); |
| if (number >= NumLines) |
| fatal("Line number %d doesn't exist. The max is %d.\n", |
| number, NumLines - 1); |
| if (!pinStates[number]) |
| signalInterrupt(number); |
| pinStates[number] = true; |
| } |
| |
| void |
| X86ISA::I8259::lowerInterruptPin(int number) |
| { |
| DPRINTF(I8259, "Interrupt signal lowered for pin %d.\n", number); |
| if (number >= NumLines) |
| fatal("Line number %d doesn't exist. The max is %d.\n", |
| number, NumLines - 1); |
| pinStates[number] = false; |
| } |
| |
| int |
| X86ISA::I8259::getVector() |
| { |
| /* |
| * This code only handles one slave. Since that's how the PC platform |
| * always uses the 8259 PIC, there shouldn't be any need for more. If |
| * there -is- a need for more for some reason, "slave" can become a |
| * vector of slaves. |
| */ |
| int line = findMsbSet(IRR); |
| IRR &= ~(1 << line); |
| DPRINTF(I8259, "Interrupt %d was accepted.\n", line); |
| if (autoEOI) { |
| handleEOI(line); |
| } else { |
| ISR |= 1 << line; |
| } |
| if (slave && bits(cascadeBits, line)) { |
| DPRINTF(I8259, "Interrupt was from slave who will " |
| "provide the vector.\n"); |
| return slave->getVector(); |
| } |
| return line | vectorOffset; |
| } |
| |
| void |
| X86ISA::I8259::serialize(CheckpointOut &cp) const |
| { |
| SERIALIZE_ARRAY(pinStates, NumLines); |
| SERIALIZE_ENUM(mode); |
| SERIALIZE_SCALAR(IRR); |
| SERIALIZE_SCALAR(ISR); |
| SERIALIZE_SCALAR(IMR); |
| SERIALIZE_SCALAR(vectorOffset); |
| SERIALIZE_SCALAR(cascadeMode); |
| SERIALIZE_SCALAR(cascadeBits); |
| SERIALIZE_SCALAR(edgeTriggered); |
| SERIALIZE_SCALAR(readIRR); |
| SERIALIZE_SCALAR(expectICW4); |
| SERIALIZE_SCALAR(initControlWord); |
| SERIALIZE_SCALAR(autoEOI); |
| } |
| |
| void |
| X86ISA::I8259::unserialize(CheckpointIn &cp) |
| { |
| UNSERIALIZE_ARRAY(pinStates, NumLines); |
| UNSERIALIZE_ENUM(mode); |
| UNSERIALIZE_SCALAR(IRR); |
| UNSERIALIZE_SCALAR(ISR); |
| UNSERIALIZE_SCALAR(IMR); |
| UNSERIALIZE_SCALAR(vectorOffset); |
| UNSERIALIZE_SCALAR(cascadeMode); |
| UNSERIALIZE_SCALAR(cascadeBits); |
| UNSERIALIZE_SCALAR(edgeTriggered); |
| UNSERIALIZE_SCALAR(readIRR); |
| UNSERIALIZE_SCALAR(expectICW4); |
| UNSERIALIZE_SCALAR(initControlWord); |
| UNSERIALIZE_SCALAR(autoEOI); |
| } |
| |
| X86ISA::I8259 * |
| I8259Params::create() |
| { |
| return new X86ISA::I8259(this); |
| } |
