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
45#include "arch/alpha/idle_event.hh"
46#include "arch/alpha/system.hh"
47#include "arch/generic/linux/threadinfo.hh"
48#include "arch/vtophys.hh"
49#include "base/loader/symtab.hh"
50#include "cpu/base.hh"
51#include "cpu/thread_context.hh"
52#include "debug/Thread.hh"
53#include "kern/linux/events.hh"
54#include "kern/linux/printk.hh"
55#include "mem/physical.hh"
56#include "mem/port.hh"
57#include "sim/arguments.hh"
58#include "sim/byteswap.hh"
59
60using namespace std;
61using namespace AlphaISA;
62using namespace Linux;
63
64LinuxAlphaSystem::LinuxAlphaSystem(Params *p)
65    : AlphaSystem(p)
66{
67}
68
69void
70LinuxAlphaSystem::initState()
71{
72    // Moved from the constructor to here since it relies on the
73    // address map being resolved in the interconnect
74
75    // Call the initialisation of the super class
76    AlphaSystem::initState();
77
78    Addr addr = 0;
79
80    /**
81     * The symbol swapper_pg_dir marks the beginning of the kernel and
82     * the location of bootloader passed arguments
83     */
84    if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
85        panic("Could not determine start location of kernel");
86    }
87
88    /**
89     * Since we aren't using a bootloader, we have to copy the
90     * kernel arguments directly into the kernel's memory.
91     */
92    virtProxy.writeBlob(CommandLine(),
93                        params()->boot_osflags.c_str(),
94                        params()->boot_osflags.length() + 1);
95
96    /**
97     * find the address of the est_cycle_freq variable and insert it
98     * so we don't through the lengthly process of trying to
99     * calculated it by using the PIT, RTC, etc.
100     */
101    if (kernelSymtab->findAddress("est_cycle_freq", addr))
102        virtProxy.write(addr, (uint64_t)(SimClock::Frequency /
103                                         params()->boot_cpu_frequency));
104
105
106    /**
107     * EV5 only supports 127 ASNs so we are going to tell the kernel that the
108     * paritiuclar EV6 we have only supports 127 asns.
109     * @todo At some point we should change ev5.hh and the palcode to support
110     * 255 ASNs.
111     */
112    if (kernelSymtab->findAddress("dp264_mv", addr))
113        virtProxy.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
114    else
115        panic("could not find dp264_mv\n");
116
117}
118
119void
120LinuxAlphaSystem::setupFuncEvents()
121{
122    AlphaSystem::setupFuncEvents();
123#ifndef NDEBUG
124    kernelPanicEvent = addKernelFuncEventOrPanic<BreakPCEvent>("panic");
125
126#endif
127
128    /**
129     * Any time ide_delay_50ms, calibarte_delay or
130     * determine_cpu_caches is called just skip the
131     * function. Currently determine_cpu_caches only is used put
132     * information in proc, however if that changes in the future we
133     * will have to fill in the cache size variables appropriately.
134     */
135
136    skipIdeDelay50msEvent =
137        addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
138    skipDelayLoopEvent =
139        addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
140    skipCacheProbeEvent =
141        addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
142    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
143    idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
144
145    // Disable for now as it runs into panic() calls in VPTr methods
146    // (see sim/vptr.hh).  Once those bugs are fixed, we can
147    // re-enable, but we should find a better way to turn it on than
148    // using DTRACE(Thread), since looking at a trace flag at tick 0
149    // leads to non-intuitive behavior with --trace-start.
150    Addr addr = 0;
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);
179        PortProxy &vp = tc->getVirtProxy();
180        vp.write(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988),
181                 GuestByteOrder);
182    }
183}
184
185void
186LinuxAlphaSystem::SkipDelayLoopEvent::process(ThreadContext *tc)
187{
188    SkipFuncEvent::process(tc);
189    // calculate and set loops_per_jiffy
190    ((LinuxAlphaSystem *)tc->getSystemPtr())->setDelayLoop(tc);
191}
192
193void
194LinuxAlphaSystem::PrintThreadInfo::process(ThreadContext *tc)
195{
196    Linux::ThreadInfo ti(tc);
197
198    DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
199            ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
200}
201
202LinuxAlphaSystem *
203LinuxAlphaSystemParams::create()
204{
205    return new LinuxAlphaSystem(this);
206}
207