Couldn’t reserve space for Cygwin’s heap

I have this old toolchain that relies on MSYS 1.0 from 20+ years ago. It’s great. I know others always love the newer, but I’m happy with this one.

Well this morning I wanted to rebuild some Qemu 0.90 thing and I got this fun error trying to run configure:

      0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x440000, State 0x10000
d:\mingw\msys\bin\bash.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0

What the heck?! MSYS uses cygwin? I guess I should have known. So the solution is to ‘rebase’ the DLL, as it tries to take a static ‘grab’ at some memory block, because…. I guess subsystems or loaded DLL’s suck?

I rebooted and got the same error.

So obviously it’s a lot more involved.

So looking the rebase I have is part of the Platform SDK. Maybe there are others.

D:\MinGW\msys\bin>"D:\MinGW\include\directx\Microsoft Visual Studio 8\VC\PlatformSDK\Bin\rebase" -b 0x50000000 msys-1.0.dll

REBASE: Total Size of mapping 0x0000000000110000
REBASE: Range 0x0000000050000000 -0x0000000050110000

And now I can run stuff again. YAY.

I’m sure this has been covered time and time again, but you know it’s mostly to remind me in another 20 years.

Running Windows 2003 r2 x64 on Qemu 0.9.0

This took me a LOT longer then it should have to figure out. So for anyone else wanting to run the 64bit versions of Windows on Qemu (I havent tested Vista/2008/7 yet) Only version 0.9.0 will work.

Because sourceforge is still giving me errors I’ll provide direct links…

Anyways to buidl Qemu you’ll need a MinGW/MSYS enviroment. The new stuff works on Vista x64 so that’s good to me, as it’ll run natively.

You’ll need the following files:


First, install MinGW by choosing the ‘current’ version, then check the following options:

*MinGW Base tools
*G++ compiler
*MinGW make

Allow it to instal into c:\MinGW

Next install MSYS with the default options. Then it’ll ask you the following, respond as I have:

Do you wish to continue with the post install? [yn ] y

Do you have MinGW installed? [yn ] y

Please answer the following in the form of c:/foo/bar.
Where is your MinGW installation? c:/mingw

Install msysDTK with the default options.

Now you should be able to run the msys CLI
Start -> run -> mingw -> msys -> msys

Let’s expand out the win32api & mingw32 dev updates:

cd /mingw
tar -zxvf /c/install/qemu-build/w32api-3.13-mingw32-dev.tar.gz
tar -zxvf /c/install/qemu-build/mingwrt-3.15.2-mingw32-dev.tar.gz

Now your ‘gcc -v’ should return something like this:

Reading specs from c:/mingw/bin/../lib/gcc/mingw32/3.4.5/specs
Configured with: ../gcc-3.4.5-20060117-3/configure –with-gcc –with-gnu-ld –wi
th-gnu-as –host=mingw32 –target=mingw32 –prefix=/mingw –enable-threads –dis
able-nls –enable-languages=c,c++,f77,ada,objc,java –disable-win32-registry –d
isable-shared –enable-sjlj-exceptions –enable-libgcj –disable-java-awt –with
out-x –enable-java-gc=boehm –disable-libgcj-debug –enable-interpreter –enabl
e-hash-synchronization –enable-libstdcxx-debug
Thread model: win32
gcc version 3.4.5 (mingw-vista special r3)

Ok, now let’s build the prerequisits, zlib & SDL.


cd /
mkdir -p /usr/src
cd /usr/src
tar -zxvf /c/install/qemu-build/zlib-1.2.3.tar.gz
make install

Now SDL.


tar -zxvf /c/install/qemu-build/SDL-1.2.13.tar.gz
cd SDL-1.2.13
make install

Now we need to tweak some things that MinGW seems to have issues finding in the /usr/local path.. I’m sure there is a better ‘fix’ but hell, this is quick & cheap!

cd /mingw/include
ln -s /usr/local/include/zconf.h .
ln -s /usr/local/include/zlib.h .
ln -s /usr/local/include/SDL .
cd /mingw/lib
ln -s /usr/local/lib/libSDL.a .
ln -s /usr/local/lib/libz.a .
cd /bin
ln -s true.exe texi2html.exe
ln -s true.exe pod2man.exe

Ok, now we just need the source to Qemu 0.9.0…. It’s becoming something RARE which is weird considering just how compatable this version is… So I’d recommend keeping a copy in email or something.


cd /usr/src
tar -zxvf /c/install/qemu-build/qemu-0.9.0.tar.gz
cd qemu-0.9.0
./configure –target-list=x86_64-softmmu

Now instead of the usual Qemu 32bit x86 emulator, you’ll get qemu-system-x86_64.exe in the x86_64-softmmu directory. Running it is just like the regular Qemu. So first I’m going to create a 16GB disk to boot from like this:

qemu-img create -f qcow win64.disk 16G

*NOTE if you have any issues where it just doesn’t work, use the qemu-img from here. I’ve had issues with the one that I’ve built, but the emulator works…. go figure.

Now let’s boot from the disc:

$ x86_64-softmmu/qemu-system-x86_64.exe -m 1024 -L pc-bios/ -hda win64.disk -cdrom en_win_srv_2003_r2_enterprise_x64_cd1.iso -net nic,model=rtl8139 -net user -boot d

Now if you don’t have the ISO files, and have physical discs don’t fret! It’s easy to have Qemu point to them… Let’s say your CD-ROM (DVD/BR disk) is D: then it’s just a matter of running:

$ x86_64-softmmu/qemu-system-x86_64.exe -m 1024 -L pc-bios/ -hda win64.disk -cdrom \\.\d: -net nic,model=rtl8139 -net user -boot d

Easy, right? Remember the -m flag for memory, otherwise your VM will run in a TINY 128mb of ram.. And it’ll be insanely SLOW.

And then you’ll get this!

The first screen.. It doesn’t sound all that 64 bit does it?

Now we are talking! It certainly is the 64 bit version… It reminds me of the PowerPC/MIPS/Alpha builds where once the Kernel has loaded, it’s all Windows NT..

Select your partition, and let’s format away!

Time for the file copy… This will take a while.


Then it’ll reboot, and you’ll get the happy bootloader!

Bootloader in action..

I haven’t timed it, but I suspect it’ll be longer then 39 minutes.

As you can see with the right version of Qemu it’s trivial to get Windows 2003 r2 x64 running… It’s good for doing some .net 32/64 bit testing… Which reminds me of another tidbit..

Some things in .net land will NOT work on IIS running in 64 bit mode. You’ll have to throw the switch to get a 32bit .net on IIS. The good news though is that this can take advantage of 2GB for a normal exe, and if you tag it, 3GB to under 4GB of ram.. So the 64bit version is not without waste.

%SystemRoot%\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis -i -enable
CScript “%SystemDrive%\InetPub\AdminScripts\adsutil.vbs” set w3svc/AppPools/Enable32bitAppOnWin64 1

I did verify that this would get sharepoint to run on 2003 x64.. As I always feel better trashing a VM then real iron…

And don’t forget the flexibility of the -redir command on Qemu to allow you to redirect ports into the VM…

Say you want to use terminal server into your VM, you can redirect say port 1000 into the vm by adding:

-redir tcp:10000:

Then it’s a simple matter of using a terminal server client to localhost:10000

I hope this clears up how easy it is to build your own Qemu, and of course how to run something other then the ‘normal’ 32bit version of Qemu.