1/*
2 * Copyright (c) 2006 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "arch/sparc/miscregfile.hh"
30#include "base/bitfield.hh"
31#include "base/trace.hh"
32#include "cpu/base.hh"
33#include "cpu/thread_context.hh"
34
35using namespace SparcISA;
36
37void
38MiscRegFile::setFSRegWithEffect(int miscReg, const MiscReg &val,
39 ThreadContext *tc)
40{
41 int64_t time;
42 switch (miscReg) {
43 /* Full system only ASRs */
44 case MISCREG_SOFTINT:
45 setReg(miscReg, val);;
46 if (val != 0x10000 && val != 0)
47 warn("Writing to softint not really supported, writing: %#x\n", val);
48 break;
49
50 case MISCREG_SOFTINT_CLR:
51 return setRegWithEffect(MISCREG_SOFTINT, ~val & softint, tc);
52 case MISCREG_SOFTINT_SET:
53 tc->getCpuPtr()->checkInterrupts = true;
54 tc->getCpuPtr()->post_interrupt(soft_interrupt);
55 return setRegWithEffect(MISCREG_SOFTINT, val | softint, tc);
56
57 case MISCREG_TICK_CMPR:
58 if (tickCompare == NULL)
59 tickCompare = new TickCompareEvent(this, tc);
60 setReg(miscReg, val);
61 if ((tick_cmpr & mask(63)) && tickCompare->scheduled())
62 tickCompare->deschedule();
63 time = (tick_cmpr & mask(63)) - (tick & mask(63));
64 if (!(tick_cmpr & ~mask(63)) && time > 0)
65 tickCompare->schedule(time * tc->getCpuPtr()->cycles(1));
66 panic("writing to TICK compare register %#X\n", val);
67 break;
68
69 case MISCREG_STICK_CMPR:
70 if (sTickCompare == NULL)
71 sTickCompare = new STickCompareEvent(this, tc);
72 setReg(miscReg, val);
73 if ((stick_cmpr & ~mask(63)) && sTickCompare->scheduled())
74 sTickCompare->deschedule();
75 time = ((int64_t)(stick_cmpr & mask(63)) - (int64_t)stick) -
76 tc->getCpuPtr()->instCount();
77 if (!(stick_cmpr & ~mask(63)) && time > 0)
78 sTickCompare->schedule(time * tc->getCpuPtr()->cycles(1) + curTick);
79 DPRINTF(Timer, "writing to sTICK compare register value %#X\n", val);
80 break;
81
82 case MISCREG_PSTATE:
83 if (val & PSTATE::ie && !(pstate & PSTATE::ie)) {
84 tc->getCpuPtr()->checkInterrupts = true;
85 }
86 setReg(miscReg, val);
87
88 case MISCREG_PIL:
89 if (val < pil) {
90 tc->getCpuPtr()->checkInterrupts = true;
91 }
92 setReg(miscReg, val);
93 break;
94
95 case MISCREG_HVER:
96 panic("Shouldn't be writing HVER\n");
97
98 case MISCREG_HINTP:
99 setReg(miscReg, val);
100
101 case MISCREG_HTBA:
102 // clear lower 7 bits on writes.
103 setReg(miscReg, val & ULL(~0x7FFF));
104 break;
105
106 case MISCREG_QUEUE_CPU_MONDO_HEAD:
107 case MISCREG_QUEUE_CPU_MONDO_TAIL:
108 case MISCREG_QUEUE_DEV_MONDO_HEAD:
109 case MISCREG_QUEUE_DEV_MONDO_TAIL:
110 case MISCREG_QUEUE_RES_ERROR_HEAD:
111 case MISCREG_QUEUE_RES_ERROR_TAIL:
112 case MISCREG_QUEUE_NRES_ERROR_HEAD:
113 case MISCREG_QUEUE_NRES_ERROR_TAIL:
114 setReg(miscReg, val);
115 tc->getCpuPtr()->checkInterrupts = true;
116 break;
117
118 case MISCREG_HSTICK_CMPR:
119 if (hSTickCompare == NULL)
120 hSTickCompare = new HSTickCompareEvent(this, tc);
121 setReg(miscReg, val);
122 if ((hstick_cmpr & ~mask(63)) && hSTickCompare->scheduled())
123 hSTickCompare->deschedule();
124 time = ((int64_t)(hstick_cmpr & mask(63)) - (int64_t)stick) -
125 tc->getCpuPtr()->instCount();
126 if (!(hstick_cmpr & ~mask(63)) && time > 0)
127 hSTickCompare->schedule(curTick + time * tc->getCpuPtr()->cycles(1));
128 DPRINTF(Timer, "writing to hsTICK compare register value %#X\n", val);
129 break;
130
131 case MISCREG_HPSTATE:
132 // T1000 spec says impl. dependent val must always be 1
133 setReg(miscReg, val | HPSTATE::id);
134 break;
135 case MISCREG_HTSTATE:
136 case MISCREG_STRAND_STS_REG:
137 setReg(miscReg, val);
138 break;
139
140 default:
141 panic("Invalid write to FS misc register %s\n", getMiscRegName(miscReg));
142 }
143}
144
145MiscReg
146MiscRegFile::readFSRegWithEffect(int miscReg, ThreadContext * tc)
147{
148 switch (miscReg) {
149 /* Privileged registers. */
150 case MISCREG_QUEUE_CPU_MONDO_HEAD:
151 case MISCREG_QUEUE_CPU_MONDO_TAIL:
152 case MISCREG_QUEUE_DEV_MONDO_HEAD:
153 case MISCREG_QUEUE_DEV_MONDO_TAIL:
154 case MISCREG_QUEUE_RES_ERROR_HEAD:
155 case MISCREG_QUEUE_RES_ERROR_TAIL:
156 case MISCREG_QUEUE_NRES_ERROR_HEAD:
157 case MISCREG_QUEUE_NRES_ERROR_TAIL:
158 case MISCREG_SOFTINT:
159 case MISCREG_TICK_CMPR:
160 case MISCREG_STICK_CMPR:
161 case MISCREG_PIL:
162 case MISCREG_HPSTATE:
163 case MISCREG_HINTP:
164 case MISCREG_HTSTATE:
165 case MISCREG_STRAND_STS_REG:
166 case MISCREG_HSTICK_CMPR:
167 return readReg(miscReg) ;
168
169 case MISCREG_HTBA:
170 return readReg(miscReg) & ULL(~0x7FFF);
171 case MISCREG_HVER:
172 return NWindows | MaxTL << 8 | MaxGL << 16;
173
174 default:
175 panic("Invalid read to FS misc register\n");
176 }
177}
178/*
179 In Niagra STICK==TICK so this isn't needed
180 case MISCREG_STICK:
181 SparcSystem *sys;
182 sys = dynamic_cast<SparcSystem*>(tc->getSystemPtr());
183 assert(sys != NULL);
184 return curTick/Clock::Int::ns - sys->sysTick | (stick & ~(mask(63)));
185*/
186
187
188
189void
190MiscRegFile::processTickCompare(ThreadContext *tc)
191{
192 panic("tick compare not implemented\n");
193}
194
195void
196MiscRegFile::processSTickCompare(ThreadContext *tc)
197{
198 // since our microcode instructions take two cycles we need to check if
199 // we're actually at the correct cycle or we need to wait a little while
200 // more
201 int ticks;
202 ticks = ((int64_t)(stick_cmpr & mask(63)) - (int64_t)stick) -
203 tc->getCpuPtr()->instCount();
204 assert(ticks >= 0 && "stick compare missed interrupt cycle");
205
206 if (ticks == 0) {
207 DPRINTF(Timer, "STick compare cycle reached at %#x\n",
208 (stick_cmpr & mask(63)));
209 if (!(tc->readMiscReg(MISCREG_STICK_CMPR) & (ULL(1) << 63))) {
210 tc->getCpuPtr()->post_interrupt(soft_interrupt);
211 tc->getCpuPtr()->checkInterrupts = true;
212 setRegWithEffect(MISCREG_SOFTINT, softint | (ULL(1) << 16), tc);
213 }
214 } else
215 sTickCompare->schedule(ticks * tc->getCpuPtr()->cycles(1) + curTick);
216}
217
218void
219MiscRegFile::processHSTickCompare(ThreadContext *tc)
220{
221 // since our microcode instructions take two cycles we need to check if
222 // we're actually at the correct cycle or we need to wait a little while
223 // more
224 int ticks;
225 ticks = ((int64_t)(hstick_cmpr & mask(63)) - (int64_t)stick) -
226 tc->getCpuPtr()->instCount();
227 assert(ticks >= 0 && "hstick compare missed interrupt cycle");
228
229 if (ticks == 0) {
230 DPRINTF(Timer, "HSTick compare cycle reached at %#x\n",
231 (stick_cmpr & mask(63)));
232 if (!(tc->readMiscReg(MISCREG_HSTICK_CMPR) & (ULL(1) << 63))) {
233 setRegWithEffect(MISCREG_HINTP, 1, tc);
234 tc->getCpuPtr()->post_interrupt(hstick_match);
235 tc->getCpuPtr()->checkInterrupts = true;
236 }
237 // Need to do something to cause interrupt to happen here !!! @todo
238 } else
239 sTickCompare->schedule(ticks * tc->getCpuPtr()->cycles(1) + curTick);
240}
241