interrupts.hh revision 8839
1/* 2 * Copyright (c) 2012 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2007 The Hewlett-Packard Development Company 15 * All rights reserved. 16 * 17 * The license below extends only to copyright in the software and shall 18 * not be construed as granting a license to any other intellectual 19 * property including but not limited to intellectual property relating 20 * to a hardware implementation of the functionality of the software 21 * licensed hereunder. You may use the software subject to the license 22 * terms below provided that you ensure that this notice is replicated 23 * unmodified and in its entirety in all distributions of the software, 24 * modified or unmodified, in source code or in binary form. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions are 28 * met: redistributions of source code must retain the above copyright 29 * notice, this list of conditions and the following disclaimer; 30 * redistributions in binary form must reproduce the above copyright 31 * notice, this list of conditions and the following disclaimer in the 32 * documentation and/or other materials provided with the distribution; 33 * neither the name of the copyright holders nor the names of its 34 * contributors may be used to endorse or promote products derived from 35 * this software without specific prior written permission. 36 * 37 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 38 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 39 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 40 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 41 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 44 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 45 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 48 * 49 * Authors: Gabe Black 50 * Andreas Hansson 51 */ 52 53#ifndef __ARCH_X86_INTERRUPTS_HH__ 54#define __ARCH_X86_INTERRUPTS_HH__ 55 56#include "arch/x86/regs/apic.hh" 57#include "arch/x86/faults.hh" 58#include "arch/x86/intmessage.hh" 59#include "base/bitfield.hh" 60#include "cpu/thread_context.hh" 61#include "dev/x86/intdev.hh" 62#include "dev/io_device.hh" 63#include "params/X86LocalApic.hh" 64#include "sim/eventq.hh" 65 66class ThreadContext; 67class BaseCPU; 68 69namespace X86ISA { 70 71class Interrupts : public BasicPioDevice, IntDev 72{ 73 protected: 74 // Storage for the APIC registers 75 uint32_t regs[NUM_APIC_REGS]; 76 77 BitUnion32(LVTEntry) 78 Bitfield<7, 0> vector; 79 Bitfield<10, 8> deliveryMode; 80 Bitfield<12> status; 81 Bitfield<13> polarity; 82 Bitfield<14> remoteIRR; 83 Bitfield<15> trigger; 84 Bitfield<16> masked; 85 Bitfield<17> periodic; 86 EndBitUnion(LVTEntry) 87 88 /* 89 * Timing related stuff. 90 */ 91 Tick latency; 92 Tick clock; 93 94 class ApicTimerEvent : public Event 95 { 96 private: 97 Interrupts *localApic; 98 public: 99 ApicTimerEvent(Interrupts *_localApic) : 100 Event(), localApic(_localApic) 101 {} 102 103 void process() 104 { 105 assert(localApic); 106 if (localApic->triggerTimerInterrupt()) { 107 localApic->setReg(APIC_INITIAL_COUNT, 108 localApic->readReg(APIC_INITIAL_COUNT)); 109 } 110 } 111 }; 112 113 ApicTimerEvent apicTimerEvent; 114 115 /* 116 * A set of variables to keep track of interrupts that don't go through 117 * the IRR. 118 */ 119 bool pendingSmi; 120 uint8_t smiVector; 121 bool pendingNmi; 122 uint8_t nmiVector; 123 bool pendingExtInt; 124 uint8_t extIntVector; 125 bool pendingInit; 126 uint8_t initVector; 127 bool pendingStartup; 128 uint8_t startupVector; 129 bool startedUp; 130 131 // This is a quick check whether any of the above (except ExtInt) are set. 132 bool pendingUnmaskableInt; 133 134 // A count of how many IPIs are in flight. 135 int pendingIPIs; 136 137 /* 138 * IRR and ISR maintenance. 139 */ 140 uint8_t IRRV; 141 uint8_t ISRV; 142 143 int 144 findRegArrayMSB(ApicRegIndex base) 145 { 146 int offset = 7; 147 do { 148 if (regs[base + offset] != 0) { 149 return offset * 32 + findMsbSet(regs[base + offset]); 150 } 151 } while (offset--); 152 return 0; 153 } 154 155 void 156 updateIRRV() 157 { 158 IRRV = findRegArrayMSB(APIC_INTERRUPT_REQUEST_BASE); 159 } 160 161 void 162 updateISRV() 163 { 164 ISRV = findRegArrayMSB(APIC_IN_SERVICE_BASE); 165 } 166 167 void 168 setRegArrayBit(ApicRegIndex base, uint8_t vector) 169 { 170 regs[base + (vector / 32)] |= (1 << (vector % 32)); 171 } 172 173 void 174 clearRegArrayBit(ApicRegIndex base, uint8_t vector) 175 { 176 regs[base + (vector / 32)] &= ~(1 << (vector % 32)); 177 } 178 179 bool 180 getRegArrayBit(ApicRegIndex base, uint8_t vector) 181 { 182 return bits(regs[base + (vector / 32)], vector % 5); 183 } 184 185 void requestInterrupt(uint8_t vector, uint8_t deliveryMode, bool level); 186 187 BaseCPU *cpu; 188 189 int initialApicId; 190 191 public: 192 193 int getInitialApicId() { return initialApicId; } 194 195 /* 196 * Params stuff. 197 */ 198 typedef X86LocalApicParams Params; 199 200 void setCPU(BaseCPU * newCPU); 201 202 void 203 setClock(Tick newClock) 204 { 205 clock = newClock; 206 } 207 208 const Params * 209 params() const 210 { 211 return dynamic_cast<const Params *>(_params); 212 } 213 214 /* 215 * Initialize this object by registering it with the IO APIC. 216 */ 217 void init(); 218 219 /* 220 * Functions to interact with the interrupt port from IntDev. 221 */ 222 Tick read(PacketPtr pkt); 223 Tick write(PacketPtr pkt); 224 Tick recvMessage(PacketPtr pkt); 225 Tick recvResponse(PacketPtr pkt); 226 227 bool 228 triggerTimerInterrupt() 229 { 230 LVTEntry entry = regs[APIC_LVT_TIMER]; 231 if (!entry.masked) 232 requestInterrupt(entry.vector, entry.deliveryMode, entry.trigger); 233 return entry.periodic; 234 } 235 236 AddrRangeList getAddrRanges(); 237 AddrRangeList getIntAddrRange(); 238 239 Port *getPort(const std::string &if_name, int idx = -1) 240 { 241 // a bit of an odd one since there is now two ports in the 242 // Python class we also need two ports even if they are 243 // identical 244 if (if_name == "int_master") { 245 return intPort; 246 } else if (if_name == "int_slave") { 247 // memory leak...but will be removed in the next patch 248 return new IntPort(name() + ".int_slave", this, this, latency); 249 } 250 return BasicPioDevice::getPort(if_name, idx); 251 } 252 253 /* 254 * Functions to access and manipulate the APIC's registers. 255 */ 256 257 uint32_t readReg(ApicRegIndex miscReg); 258 void setReg(ApicRegIndex reg, uint32_t val); 259 void 260 setRegNoEffect(ApicRegIndex reg, uint32_t val) 261 { 262 regs[reg] = val; 263 } 264 265 /* 266 * Constructor. 267 */ 268 269 Interrupts(Params * p); 270 271 /* 272 * Functions for retrieving interrupts for the CPU to handle. 273 */ 274 275 bool checkInterrupts(ThreadContext *tc) const; 276 Fault getInterrupt(ThreadContext *tc); 277 void updateIntrInfo(ThreadContext *tc); 278 279 /* 280 * Serialization. 281 */ 282 283 virtual void serialize(std::ostream &os); 284 virtual void unserialize(Checkpoint *cp, const std::string §ion); 285 286 /* 287 * Old functions needed for compatability but which will be phased out 288 * eventually. 289 */ 290 void 291 post(int int_num, int index) 292 { 293 panic("Interrupts::post unimplemented!\n"); 294 } 295 296 void 297 clear(int int_num, int index) 298 { 299 panic("Interrupts::clear unimplemented!\n"); 300 } 301 302 void 303 clearAll() 304 { 305 panic("Interrupts::clearAll unimplemented!\n"); 306 } 307}; 308 309} // namespace X86ISA 310 311#endif // __ARCH_X86_INTERRUPTS_HH__ 312