interrupts.cc revision 5649 
1/*
2 * Copyright (c) 2008 The Hewlett-Packard Development Company
3 * All rights reserved.
4 *
5 * Redistribution and use of this software in source and binary forms,
6 * with or without modification, are permitted provided that the
7 * following conditions are met:
8 *
9 * The software must be used only for Non-Commercial Use which means any
10 * use which is NOT directed to receiving any direct monetary
11 * compensation for, or commercial advantage from such use.  Illustrative
12 * examples of non-commercial use are academic research, personal study,
13 * teaching, education and corporate research & development.
14 * Illustrative examples of commercial use are distributing products for
15 * commercial advantage and providing services using the software for
16 * commercial advantage.
17 *
18 * If you wish to use this software or functionality therein that may be
19 * covered by patents for commercial use, please contact:
20 *     Director of Intellectual Property Licensing
21 *     Office of Strategy and Technology
22 *     Hewlett-Packard Company
23 *     1501 Page Mill Road
24 *     Palo Alto, California  94304
25 *
26 * Redistributions of source code must retain the above copyright notice,
27 * this list of conditions and the following disclaimer.  Redistributions
28 * in binary form must reproduce the above copyright notice, this list of
29 * conditions and the following disclaimer in the documentation and/or
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31 * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
32 * contributors may be used to endorse or promote products derived from
33 * this software without specific prior written permission.  No right of
34 * sublicense is granted herewith.  Derivatives of the software and
35 * output created using the software may be prepared, but only for
36 * Non-Commercial Uses.  Derivatives of the software may be shared with
37 * others provided: (i) the others agree to abide by the list of
38 * conditions herein which includes the Non-Commercial Use restrictions;
39 * and (ii) such Derivatives of the software include the above copyright
40 * notice to acknowledge the contribution from this software where
41 * applicable, this list of conditions and the disclaimer below.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
44 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
45 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
46 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
47 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
53 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
54 *
55 * Authors: Gabe Black
56 */
57
58#include "arch/x86/apicregs.hh"
59#include "arch/x86/interrupts.hh"
60#include "cpu/base.hh"
61
62int
63divideFromConf(uint32_t conf)
64{
65    // This figures out what division we want from the division configuration
66    // register in the local APIC. The encoding is a little odd but it can
67    // be deciphered fairly easily.
68    int shift = ((conf & 0x8) >> 1) | (conf & 0x3);
69    shift = (shift + 1) % 8;
70    return 1 << shift;
71}
72
73namespace X86ISA
74{
75
76ApicRegIndex
77decodeAddr(Addr paddr)
78{
79    ApicRegIndex regNum;
80    paddr &= ~mask(3);
81    switch (paddr)
82    {
83      case 0x20:
84        regNum = APIC_ID;
85        break;
86      case 0x30:
87        regNum = APIC_VERSION;
88        break;
89      case 0x80:
90        regNum = APIC_TASK_PRIORITY;
91        break;
92      case 0x90:
93        regNum = APIC_ARBITRATION_PRIORITY;
94        break;
95      case 0xA0:
96        regNum = APIC_PROCESSOR_PRIORITY;
97        break;
98      case 0xB0:
99        regNum = APIC_EOI;
100        break;
101      case 0xD0:
102        regNum = APIC_LOGICAL_DESTINATION;
103        break;
104      case 0xE0:
105        regNum = APIC_DESTINATION_FORMAT;
106        break;
107      case 0xF0:
108        regNum = APIC_SPURIOUS_INTERRUPT_VECTOR;
109        break;
110      case 0x100:
111      case 0x108:
112      case 0x110:
113      case 0x118:
114      case 0x120:
115      case 0x128:
116      case 0x130:
117      case 0x138:
118      case 0x140:
119      case 0x148:
120      case 0x150:
121      case 0x158:
122      case 0x160:
123      case 0x168:
124      case 0x170:
125      case 0x178:
126        regNum = APIC_IN_SERVICE((paddr - 0x100) / 0x8);
127        break;
128      case 0x180:
129      case 0x188:
130      case 0x190:
131      case 0x198:
132      case 0x1A0:
133      case 0x1A8:
134      case 0x1B0:
135      case 0x1B8:
136      case 0x1C0:
137      case 0x1C8:
138      case 0x1D0:
139      case 0x1D8:
140      case 0x1E0:
141      case 0x1E8:
142      case 0x1F0:
143      case 0x1F8:
144        regNum = APIC_TRIGGER_MODE((paddr - 0x180) / 0x8);
145        break;
146      case 0x200:
147      case 0x208:
148      case 0x210:
149      case 0x218:
150      case 0x220:
151      case 0x228:
152      case 0x230:
153      case 0x238:
154      case 0x240:
155      case 0x248:
156      case 0x250:
157      case 0x258:
158      case 0x260:
159      case 0x268:
160      case 0x270:
161      case 0x278:
162        regNum = APIC_INTERRUPT_REQUEST((paddr - 0x200) / 0x8);
163        break;
164      case 0x280:
165        regNum = APIC_ERROR_STATUS;
166        break;
167      case 0x300:
168        regNum = APIC_INTERRUPT_COMMAND_LOW;
169        break;
170      case 0x310:
171        regNum = APIC_INTERRUPT_COMMAND_HIGH;
172        break;
173      case 0x320:
174        regNum = APIC_LVT_TIMER;
175        break;
176      case 0x330:
177        regNum = APIC_LVT_THERMAL_SENSOR;
178        break;
179      case 0x340:
180        regNum = APIC_LVT_PERFORMANCE_MONITORING_COUNTERS;
181        break;
182      case 0x350:
183        regNum = APIC_LVT_LINT0;
184        break;
185      case 0x360:
186        regNum = APIC_LVT_LINT1;
187        break;
188      case 0x370:
189        regNum = APIC_LVT_ERROR;
190        break;
191      case 0x380:
192        regNum = APIC_INITIAL_COUNT;
193        break;
194      case 0x390:
195        regNum = APIC_CURRENT_COUNT;
196        break;
197      case 0x3E0:
198        regNum = APIC_DIVIDE_CONFIGURATION;
199        break;
200      default:
201        // A reserved register field.
202        panic("Accessed reserved register field %#x.\n", paddr);
203        break;
204    }
205    return regNum;
206}
207}
208
209Tick
210X86ISA::Interrupts::read(PacketPtr pkt)
211{
212    Addr offset = pkt->getAddr() - pioAddr;
213    //Make sure we're at least only accessing one register.
214    if ((offset & ~mask(3)) != ((offset + pkt->getSize()) & ~mask(3)))
215        panic("Accessed more than one register at a time in the APIC!\n");
216    ApicRegIndex reg = decodeAddr(offset);
217    uint32_t val = htog(readReg(reg));
218    DPRINTF(LocalApic,
219            "Reading Local APIC register %d at offset %#x as %#x.\n",
220            reg, offset, val);
221    pkt->setData(((uint8_t *)&val) + (offset & mask(3)));
222    return latency;
223}
224
225Tick
226X86ISA::Interrupts::write(PacketPtr pkt)
227{
228    Addr offset = pkt->getAddr() - pioAddr;
229    //Make sure we're at least only accessing one register.
230    if ((offset & ~mask(3)) != ((offset + pkt->getSize()) & ~mask(3)))
231        panic("Accessed more than one register at a time in the APIC!\n");
232    ApicRegIndex reg = decodeAddr(offset);
233    uint32_t val = regs[reg];
234    pkt->writeData(((uint8_t *)&val) + (offset & mask(3)));
235    DPRINTF(LocalApic,
236            "Writing Local APIC register %d at offset %#x as %#x.\n",
237            reg, offset, gtoh(val));
238    setReg(reg, gtoh(val));
239    return latency;
240}
241
242uint32_t
243X86ISA::Interrupts::readReg(ApicRegIndex reg)
244{
245    if (reg >= APIC_TRIGGER_MODE(0) &&
246            reg <= APIC_TRIGGER_MODE(15)) {
247        panic("Local APIC Trigger Mode registers are unimplemented.\n");
248    }
249    switch (reg) {
250      case APIC_ARBITRATION_PRIORITY:
251        panic("Local APIC Arbitration Priority register unimplemented.\n");
252        break;
253      case APIC_PROCESSOR_PRIORITY:
254        panic("Local APIC Processor Priority register unimplemented.\n");
255        break;
256      case APIC_EOI:
257        panic("Local APIC EOI register unimplemented.\n");
258        break;
259      case APIC_ERROR_STATUS:
260        regs[APIC_INTERNAL_STATE] &= ~ULL(0x1);
261        break;
262      case APIC_INTERRUPT_COMMAND_LOW:
263        panic("Local APIC Interrupt Command low"
264                " register unimplemented.\n");
265        break;
266      case APIC_INTERRUPT_COMMAND_HIGH:
267        panic("Local APIC Interrupt Command high"
268                " register unimplemented.\n");
269        break;
270      case APIC_CURRENT_COUNT:
271        {
272            assert(clock);
273            uint32_t val = regs[reg] - curTick / clock;
274            val /= (16 * divideFromConf(regs[APIC_DIVIDE_CONFIGURATION]));
275            return val;
276        }
277      default:
278        break;
279    }
280    return regs[reg];
281}
282
283void
284X86ISA::Interrupts::setReg(ApicRegIndex reg, uint32_t val)
285{
286    uint32_t newVal = val;
287    if (reg >= APIC_IN_SERVICE(0) &&
288            reg <= APIC_IN_SERVICE(15)) {
289        panic("Local APIC In-Service registers are unimplemented.\n");
290    }
291    if (reg >= APIC_TRIGGER_MODE(0) &&
292            reg <= APIC_TRIGGER_MODE(15)) {
293        panic("Local APIC Trigger Mode registers are unimplemented.\n");
294    }
295    if (reg >= APIC_INTERRUPT_REQUEST(0) &&
296            reg <= APIC_INTERRUPT_REQUEST(15)) {
297        panic("Local APIC Interrupt Request registers "
298                "are unimplemented.\n");
299    }
300    switch (reg) {
301      case APIC_ID:
302        newVal = val & 0xFF;
303        break;
304      case APIC_VERSION:
305        // The Local APIC Version register is read only.
306        return;
307      case APIC_TASK_PRIORITY:
308        newVal = val & 0xFF;
309        break;
310      case APIC_ARBITRATION_PRIORITY:
311        panic("Local APIC Arbitration Priority register unimplemented.\n");
312        break;
313      case APIC_PROCESSOR_PRIORITY:
314        panic("Local APIC Processor Priority register unimplemented.\n");
315        break;
316      case APIC_EOI:
317        panic("Local APIC EOI register unimplemented.\n");
318        break;
319      case APIC_LOGICAL_DESTINATION:
320        newVal = val & 0xFF000000;
321        break;
322      case APIC_DESTINATION_FORMAT:
323        newVal = val | 0x0FFFFFFF;
324        break;
325      case APIC_SPURIOUS_INTERRUPT_VECTOR:
326        regs[APIC_INTERNAL_STATE] &= ~ULL(1 << 1);
327        regs[APIC_INTERNAL_STATE] |= val & (1 << 8);
328        if (val & (1 << 9))
329            warn("Focus processor checking not implemented.\n");
330        break;
331      case APIC_ERROR_STATUS:
332        {
333            if (regs[APIC_INTERNAL_STATE] & 0x1) {
334                regs[APIC_INTERNAL_STATE] &= ~ULL(0x1);
335                newVal = 0;
336            } else {
337                regs[APIC_INTERNAL_STATE] |= ULL(0x1);
338                return;
339            }
340
341        }
342        break;
343      case APIC_INTERRUPT_COMMAND_LOW:
344        panic("Local APIC Interrupt Command low"
345                " register unimplemented.\n");
346        break;
347      case APIC_INTERRUPT_COMMAND_HIGH:
348        panic("Local APIC Interrupt Command high"
349                " register unimplemented.\n");
350        break;
351      case APIC_LVT_TIMER:
352      case APIC_LVT_THERMAL_SENSOR:
353      case APIC_LVT_PERFORMANCE_MONITORING_COUNTERS:
354      case APIC_LVT_LINT0:
355      case APIC_LVT_LINT1:
356      case APIC_LVT_ERROR:
357        {
358            uint64_t readOnlyMask = (1 << 12) | (1 << 14);
359            newVal = (val & ~readOnlyMask) |
360                     (regs[reg] & readOnlyMask);
361        }
362        break;
363      case APIC_INITIAL_COUNT:
364        {
365            assert(clock);
366            newVal = bits(val, 31, 0);
367            uint32_t newCount = newVal *
368                (divideFromConf(regs[APIC_DIVIDE_CONFIGURATION]) * 16);
369            regs[APIC_CURRENT_COUNT] = newCount + curTick / clock;
370            // Find out how long a "tick" of the timer should take.
371            Tick timerTick = 16 * clock;
372            // Schedule on the edge of the next tick plus the new count.
373            Tick offset = curTick % timerTick;
374            if (offset) {
375                reschedule(apicTimerEvent,
376                        curTick + (newCount + 1) * timerTick - offset, true);
377            } else {
378                reschedule(apicTimerEvent,
379                        curTick + newCount * timerTick, true);
380            }
381        }
382        break;
383      case APIC_CURRENT_COUNT:
384        //Local APIC Current Count register is read only.
385        return;
386      case APIC_DIVIDE_CONFIGURATION:
387        newVal = val & 0xB;
388        break;
389      default:
390        break;
391    }
392    regs[reg] = newVal;
393    return;
394}
395
396X86ISA::Interrupts *
397X86LocalApicParams::create()
398{
399    return new X86ISA::Interrupts(this);
400}
401