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 Addr addr = 0;
67
68 /**
69 * The symbol swapper_pg_dir marks the beginning of the kernel and
70 * the location of bootloader passed arguments
71 */
72 if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
73 panic("Could not determine start location of kernel");
74 }
75
76 /**
77 * Since we aren't using a bootloader, we have to copy the
78 * kernel arguments directly into the kernel's memory.
79 */
80 virtPort->writeBlob(CommandLine(), (uint8_t*)params()->boot_osflags.c_str(),
81 params()->boot_osflags.length()+1);
82
83 /**
84 * find the address of the est_cycle_freq variable and insert it
85 * so we don't through the lengthly process of trying to
86 * calculated it by using the PIT, RTC, etc.
87 */
88 if (kernelSymtab->findAddress("est_cycle_freq", addr))
89 virtPort->write(addr, (uint64_t)(SimClock::Frequency /
90 p->boot_cpu_frequency));
91
92
93 /**
94 * EV5 only supports 127 ASNs so we are going to tell the kernel that the
95 * paritiuclar EV6 we have only supports 127 asns.
96 * @todo At some point we should change ev5.hh and the palcode to support
97 * 255 ASNs.
98 */
99 if (kernelSymtab->findAddress("dp264_mv", addr))
100 virtPort->write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
101 else
102 panic("could not find dp264_mv\n");
103
104#ifndef NDEBUG
105 kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
106 if (!kernelPanicEvent)
107 panic("could not find kernel symbol \'panic\'");
108
109#if 0
110 kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel");
111 if (!kernelDieEvent)
112 panic("could not find kernel symbol \'die_if_kernel\'");
113#endif
114
115#endif
116
117 /**
118 * Any time ide_delay_50ms, calibarte_delay or
119 * determine_cpu_caches is called just skip the
120 * function. Currently determine_cpu_caches only is used put
121 * information in proc, however if that changes in the future we
122 * will have to fill in the cache size variables appropriately.
123 */
124
125 skipIdeDelay50msEvent =
126 addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
127 skipDelayLoopEvent =
128 addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
129 skipCacheProbeEvent =
130 addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
131 debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
132 idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
133
134 // Disable for now as it runs into panic() calls in VPTr methods
135 // (see sim/vptr.hh). Once those bugs are fixed, we can
136 // re-enable, but we should find a better way to turn it on than
137 // using DTRACE(Thread), since looking at a trace flag at tick 0
138 // leads to non-intuitive behavior with --trace-start.
139 if (false && kernelSymtab->findAddress("alpha_switch_to", addr)) {
140 printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
141 addr + sizeof(MachInst) * 6);
142 } else {
143 printThreadEvent = NULL;
144 }
145}
146
147LinuxAlphaSystem::~LinuxAlphaSystem()
148{
149#ifndef NDEBUG
150 delete kernelPanicEvent;
151#endif
152 delete skipIdeDelay50msEvent;
153 delete skipDelayLoopEvent;
154 delete skipCacheProbeEvent;
155 delete debugPrintkEvent;
156 delete idleStartEvent;
157 delete printThreadEvent;
158}
159
160void
161LinuxAlphaSystem::setDelayLoop(ThreadContext *tc)
162{
163 Addr addr = 0;
164 if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
165 Tick cpuFreq = tc->getCpuPtr()->frequency();
166 assert(intrFreq);
167 VirtualPort *vp;
168
169 vp = tc->getVirtPort();
170 vp->writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988));
171 }
172}
173
174void
175LinuxAlphaSystem::SkipDelayLoopEvent::process(ThreadContext *tc)
176{
177 SkipFuncEvent::process(tc);
178 // calculate and set loops_per_jiffy
179 ((LinuxAlphaSystem *)tc->getSystemPtr())->setDelayLoop(tc);
180}
181
182void
183LinuxAlphaSystem::PrintThreadInfo::process(ThreadContext *tc)
184{
185 Linux::ThreadInfo ti(tc);
186
187 DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
188 ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
189}
190
191LinuxAlphaSystem *
192LinuxAlphaSystemParams::create()
193{
194 return new LinuxAlphaSystem(this);
195}