src/arch/alpha/freebsd/system.cc

   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: Ben Nash
  29  */
  30
  31 /**
  32  * @file
  33  * Modifications for the FreeBSD kernel.
  34  * Based on kern/linux/linux_system.cc.
  35  *
  36  */
  37
  38 #include "arch/alpha/freebsd/system.hh"
  39 #include "arch/alpha/system.hh"
  40 #include "arch/isa_traits.hh"
  41 #include "arch/vtophys.hh"
  42 #include "base/loader/symtab.hh"
  43 #include "cpu/thread_context.hh"
  44 #include "mem/physical.hh"
  45 #include "mem/port.hh"
  46 #include "sim/byteswap.hh"
  47
  48 #define TIMER_FREQUENCY 1193180
  49
  50 using namespace std;
  51 using namespace AlphaISA;
  52
  53 FreebsdAlphaSystem::FreebsdAlphaSystem(Params *p)
  54     : AlphaSystem(p)
  55 {
  56     /**
  57      * Any time DELAY is called just skip the function.
  58      * Shouldn't we actually emulate the delay?
  59      */
  60     skipDelayEvent = addKernelFuncEvent<SkipFuncEvent>("DELAY");
  61     skipCalibrateClocks =
  62         addKernelFuncEvent<SkipCalibrateClocksEvent>("calibrate_clocks");
  63 }
  64
  65
  66 FreebsdAlphaSystem::~FreebsdAlphaSystem()
  67 {
  68     delete skipDelayEvent;
  69     delete skipCalibrateClocks;
  70 }
  71
  72
  73 void
  74 FreebsdAlphaSystem::doCalibrateClocks(ThreadContext *tc)
  75 {
  76     Addr ppc_vaddr = 0;
  77     Addr timer_vaddr = 0;
  78
  79     ppc_vaddr = (Addr)tc->readIntReg(ArgumentReg1);
  80     timer_vaddr = (Addr)tc->readIntReg(ArgumentReg2);
  81
  82     virtPort.write(ppc_vaddr, (uint32_t)Clock::Frequency);
  83     virtPort.write(timer_vaddr, (uint32_t)TIMER_FREQUENCY);
  84 }
  85
  86
  87 void
  88 FreebsdAlphaSystem::SkipCalibrateClocksEvent::process(ThreadContext *tc)
  89 {
  90     SkipFuncEvent::process(tc);
  91     ((FreebsdAlphaSystem *)tc->getSystemPtr())->doCalibrateClocks(tc);
  92 }
  93
  94 FreebsdAlphaSystem *
  95 FreebsdAlphaSystemParams::create()
  96 {
  97     return new FreebsdAlphaSystem(this);
  98 }