1/*
2 * Copyright (c) 2004-2005 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 * Authors: Ali Saidi
29 * Lisa Hsu
30 * Nathan Binkert
31 * Steve Reinhardt
32 */
33
34/**
35 * @file
36 * This code loads the linux kernel, console, pal and patches certain
37 * functions. The symbol tables are loaded so that traces can show
38 * the executing function and we can skip functions. Various delay
39 * loops are skipped and their final values manually computed to speed
40 * up boot time.
41 */
42
43#include "arch/alpha/linux/system.hh"
44#include "arch/alpha/linux/threadinfo.hh"
45#include "arch/alpha/idle_event.hh"
46#include "arch/alpha/system.hh"
47#include "arch/vtophys.hh"
48#include "base/loader/symtab.hh"
49#include "cpu/base.hh"
50#include "cpu/thread_context.hh"
51#include "debug/Thread.hh"
52#include "kern/linux/events.hh"
53#include "kern/linux/printk.hh"
54#include "mem/physical.hh"
55#include "mem/port.hh"
56#include "sim/arguments.hh"
57#include "sim/byteswap.hh"
58
59using namespace std;
60using namespace AlphaISA;
61using namespace Linux;
62
63LinuxAlphaSystem::LinuxAlphaSystem(Params *p)
64 : AlphaSystem(p)
65{
66}
67
68void
69LinuxAlphaSystem::initState()
70{
71 // Moved from the constructor to here since it relies on the
72 // address map being resolved in the interconnect
73
74 // Call the initialisation of the super class
75 AlphaSystem::initState();
76
77 Addr addr = 0;
78
79 /**
80 * The symbol swapper_pg_dir marks the beginning of the kernel and
81 * the location of bootloader passed arguments
82 */
83 if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
84 panic("Could not determine start location of kernel");
85 }
86
87 /**
88 * Since we aren't using a bootloader, we have to copy the
89 * kernel arguments directly into the kernel's memory.
90 */
80 virtPort->writeBlob(CommandLine(), (uint8_t*)params()->boot_osflags.c_str(),
81 params()->boot_osflags.length()+1);
91 virtProxy->writeBlob(CommandLine(),
92 (uint8_t*)params()->boot_osflags.c_str(),
93 params()->boot_osflags.length()+1);
94
95 /**
96 * find the address of the est_cycle_freq variable and insert it
97 * so we don't through the lengthly process of trying to
98 * calculated it by using the PIT, RTC, etc.
99 */
100 if (kernelSymtab->findAddress("est_cycle_freq", addr))
89 virtPort->write(addr, (uint64_t)(SimClock::Frequency /
90 p->boot_cpu_frequency));
101 virtProxy->write(addr, (uint64_t)(SimClock::Frequency /
102 params()->boot_cpu_frequency));
103
104
105 /**
106 * EV5 only supports 127 ASNs so we are going to tell the kernel that the
107 * paritiuclar EV6 we have only supports 127 asns.
108 * @todo At some point we should change ev5.hh and the palcode to support
109 * 255 ASNs.
110 */
111 if (kernelSymtab->findAddress("dp264_mv", addr))
100 virtPort->write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
112 virtProxy->write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
113 else
114 panic("could not find dp264_mv\n");
115
116#ifndef NDEBUG
117 kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
118 if (!kernelPanicEvent)
119 panic("could not find kernel symbol \'panic\'");
120
121#if 0
122 kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel");
123 if (!kernelDieEvent)
124 panic("could not find kernel symbol \'die_if_kernel\'");
125#endif
126
127#endif
128
129 /**
130 * Any time ide_delay_50ms, calibarte_delay or
131 * determine_cpu_caches is called just skip the
132 * function. Currently determine_cpu_caches only is used put
133 * information in proc, however if that changes in the future we
134 * will have to fill in the cache size variables appropriately.
135 */
136
137 skipIdeDelay50msEvent =
138 addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
139 skipDelayLoopEvent =
140 addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
141 skipCacheProbeEvent =
142 addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
143 debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
144 idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
145
146 // Disable for now as it runs into panic() calls in VPTr methods
147 // (see sim/vptr.hh). Once those bugs are fixed, we can
148 // re-enable, but we should find a better way to turn it on than
149 // using DTRACE(Thread), since looking at a trace flag at tick 0
150 // leads to non-intuitive behavior with --trace-start.
151 if (false && kernelSymtab->findAddress("alpha_switch_to", addr)) {
152 printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
153 addr + sizeof(MachInst) * 6);
154 } else {
155 printThreadEvent = NULL;
156 }
157}
158
159LinuxAlphaSystem::~LinuxAlphaSystem()
160{
161#ifndef NDEBUG
162 delete kernelPanicEvent;
163#endif
164 delete skipIdeDelay50msEvent;
165 delete skipDelayLoopEvent;
166 delete skipCacheProbeEvent;
167 delete debugPrintkEvent;
168 delete idleStartEvent;
169 delete printThreadEvent;
170}
171
172void
173LinuxAlphaSystem::setDelayLoop(ThreadContext *tc)
174{
175 Addr addr = 0;
176 if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
177 Tick cpuFreq = tc->getCpuPtr()->frequency();
178 assert(intrFreq);
167 VirtualPort *vp;
179 FSTranslatingPortProxy* vp;
180
169 vp = tc->getVirtPort();
181 vp = tc->getVirtProxy();
182 vp->writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988));
183 }
184}
185
186void
187LinuxAlphaSystem::SkipDelayLoopEvent::process(ThreadContext *tc)
188{
189 SkipFuncEvent::process(tc);
190 // calculate and set loops_per_jiffy
191 ((LinuxAlphaSystem *)tc->getSystemPtr())->setDelayLoop(tc);
192}
193
194void
195LinuxAlphaSystem::PrintThreadInfo::process(ThreadContext *tc)
196{
197 Linux::ThreadInfo ti(tc);
198
199 DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
200 ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
201}
202
203LinuxAlphaSystem *
204LinuxAlphaSystemParams::create()
205{
206 return new LinuxAlphaSystem(this);
207}