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List: bochs-dev
Subject: Re: [Bochs-developers] Problem compiling Bochs for 486 CPU because
From: "Stanislav" <stlintel () gmail ! com>
Date: 2009-10-02 14:38:18
Message-ID: 00e201ca436d$fde8a920$f9b9fb60$ () com
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This was a bug in 2.4.1 release, just download latest CVS snapshot.
Stanislav
From: Kelly Carter [mailto:kcarter@ssai.org]
Sent: Friday, October 02, 2009 3:52 PM
To: bochs-developers@lists.sourceforge.net
Subject: [Bochs-developers] Problem compiling Bochs for 486 CPU because of
PAE option
I'm new to the Bochs developer community. Here is my first question.
I'm attempting to recompile Bochs to emulate a 486 CPU. Compilation is
failing due to something related to Physical Address Extensions (PAE):
In file paging.cc, this conditional expression is being skipped over:
#if BX_SUPPORT_PAE
bx_bool BX_CPP_AttrRegparmN(1) BX_CPU_C::CheckPDPTR(Bit32u cr3_val)
.because I have set configuration option --enable-pae=no (since that's
required for my CPU level = 4).
So, CheckPDPTR is not defined when the compiler hits proc_ctl.cc:
if (BX_CPU_THIS_PTR cr0.get_PG() && BX_CPU_THIS_PTR cr4.get_PAE() &&
!long_mode()) {
if (! CheckPDPTR(val_32)) {
BX_ERROR(("SetCR3(): PDPTR check failed !"));
exception(BX_GP_EXCEPTION, 0, 0);
}
}
If I try setting --enable-pae=yes, compilation fails because my CPU is set
to 4.
I am brand new to Bochs and don't know the source code yet, and there aren't
many comments in the code to guide me. Does anyone on this list have any
insight or suggestions for the problem I've described? Thanks in advance.
Kelly Carter
Support Systems Associates, Inc.; 800 Park Drive; Warner Robins, GA 31088
kcarter@ssai.org; 478.328.8377 x.233
The information transmitted is intended only for the person or entity to
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<p class=MsoNormal><span style='color:#1F497D'>This was a bug in 2.4.1 release,
just download latest CVS snapshot.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Stanislav<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span \
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span \
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Kelly Carter \
[mailto:kcarter@ssai.org] <br> <b>Sent:</b> Friday, October 02, 2009 3:52 PM<br>
<b>To:</b> bochs-developers@lists.sourceforge.net<br>
<b>Subject:</b> [Bochs-developers] Problem compiling Bochs for 486 CPU because
of PAE option<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m new to the Bochs developer community. Here is my first
question…<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m attempting to recompile Bochs to emulate a 486 CPU.
Compilation is failing due to something related to <b>Physical Address
Extensions (PAE)</b>:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>In file <b>paging.cc</b>, this conditional expression is
being skipped over:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Lucida \
Console"'>#if <b>BX_SUPPORT_PAE</b><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Lucida \
Console"'>bx_bool BX_CPP_AttrRegparmN(1) BX_CPU_C::<b>CheckPDPTR</b>(Bit32u \
cr3_val)</span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>…because I have set configuration option \
<b>--enable-pae=no</b> (since that’s required for my CPU level = \
4).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>So, <b>CheckPDPTR</b> is not defined when the compiler hits \
<b>proc_ctl.cc</b>:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Lucida \
Console"'>if (BX_CPU_THIS_PTR cr0.get_PG() && BX_CPU_THIS_PTR cr4.get_PAE()
&& !long_mode()) {<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><span
style='font-family:"Lucida Console"'>if (! <b>CheckPDPTR</b>(val_32)) \
{<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in;text-indent:.5in'><span
style='font-family:"Lucida Console"'>BX_ERROR(("SetCR3(): PDPTR check
failed !"));<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in;text-indent:.5in'><span
style='font-family:"Lucida Console"'>exception(BX_GP_EXCEPTION, 0, \
0);<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><span
style='font-family:"Lucida Console"'>}<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Lucida \
Console"'>}<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>If I try setting <b>--enable-pae=yes</b>, compilation fails
because my CPU is set to 4.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am brand new to Bochs and don’t know the source code yet,
and there aren’t many comments in the code to guide me. Does anyone on this
list have any insight or suggestions for the problem I’ve described? Thanks in
advance.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b><span \
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Kelly \
Carter<o:p></o:p></span></b></p>
<p class=MsoNormal><span \
style='font-size:8.0pt;font-family:"Arial","sans-serif"'>Support Systems Associates, \
Inc.; 800 Park Drive; Warner Robins, GA 31088<o:p></o:p></span></p>
<p class=MsoNormal><span \
style='font-size:8.0pt;font-family:"Arial","sans-serif"'>kcarter@ssai.org; \
478.328.8377 x.233<o:p></o:p></span></p>
<p class=MsoNormal><span \
style='font-size:8.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial","sans-serif"'>The
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material. Any review, retransmission, dissemination or other use of, or taking
of any action in reliance upon, this information by persons or entities other
than the intended recipient is prohibited. If you received this in error,
please contact the sender and delete the material from all computers.</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
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