Thread: MmMapIoSpace

I am trying to use MmMapIoSpace and I get the following error:

error LNK2001: unresolved external symbol "__declspec(dllimport) void * __cdecl MmMapIoSpace(union _LARGE_INTEGER,unsigned long,enum _MEMORY_CACHING_TYPE)" (__imp_?MmMapIoSpace@@YAPAXT_LARGE_INTEGER@@KW4_ME MORY_CACHING_TYPE@@@Z)

I think I need to link in a library, can anyone tell the name of the library that I need? I am using Win2000, Visual C++ 6.0

Also, is there anyway to find out what libraries function calls belong to?

Thanks,

-geoff.

I think its part of the windows Driver Developement Kit (DDK)...

Go to MSDN and download the DDK.....in there you should have all the libraries, headers & documentation you need

I already have the DDK, the documentation does not refer to this call specifically or give the library name in which it is contained. I am sure I have the library, I am just not linking it in.

Hmm..ok...

I just installed my copy again and did a hex search on the 4 libraries that come with the ddk....

Only wdm.lib had the string "MmMapIoSpace" amongst its contents (as the libs are C linkage, you can usually see the function names quite easilly), so I suggest you try with that

Thanks! do I have to do something different to the project settings because of the C linkage?

I went to Project->Settings->Link

and set the "Additional Library Path" to the directory where wdm.lib lives and added wdm.lib to "Object/library modules" but I get the same error.

Any ideas?

Originally posted by geeoff99
I went to Project->Settings->Link

and set the "Additional Library Path" to the directory where wdm.lib lives and added wdm.lib to "Object/library modules" but I get the same error.

Any ideas?

As you are in VC++, try adding the following line below your includes

Code:

//assuming libs are in C:\NTDDK\lib\i386\free
#pragma comment(lib,"C:\\NTDDK\\lib\\i386\\free\\wdm.lib")

Originally posted by geeoff99
[B]do I have to do something different to the project settings because of the C linkage?

No

I still get the same error while linking ... any more ideas?

Here is the code, probably will not help but it is worth a try ...

Code:

#include <wdm.h>

#pragma comment(lib,"D:\\NTDDK\\libfre\\i386\\wdm.lib")

int main()
{
	PVOID biosVA;
	static PHYSICAL_ADDRESS biosPA;
	biosVA = MmMapIoSpace( biosPA, 0x10000, MmNonCached );
	return 0;
}

any more ideas on this one? (see thread)