Module information -- !lmi

0: kd> !lmi hpdskflt

Loaded Module Info: [hpdskflt] 

         Module: hpdskflt

   Base Address: fffffa6001a00000

     Image Name: hpdskflt.sys

   Machine Type: 34404 (X64)

     Time Stamp: 47e0334b Tue Mar 18 14:25:31 2008

           Size: a000

       CheckSum: e730

Characteristics: 22  

Debug Data Dirs: Type  Size     VA  Pointer

             CODEVIEW    55,  5220,    3a20 RSDS - GUID: {E531AC22-7E5E-4FC1-AB65-452496512564}

               Age: 30, Pdb: c:\prog\vendors\osr\hp3dgsr_vista\Release\amd64\hpdskflt.pdb

     Image Type: MEMORY   - Image read successfully from loaded memory.

    Symbol Type: NONE     - PDB not found from symbol server.

    Load Report: no symbols loaded

You can get more information in http://msdn.microsoft.com/en-us/library/windows/hardware/ff563955(v=vs.85).aspx.

The !lmi extension analyzes the module headers and displays a formatted summary of the information therein. If the module headers are paged out, an error message is displayed. To see a more extensive display of header information, use the !dh extension command.

You will need the PE and COFF knowledge for these two commands.  You can download the specification in the http://msdn.microsoft.com/library/windows/hardware/gg463125.

There is also a good website http://www.godevtool.com/Other/pdb.htm.

How to implement it?

IDebugSymbols::GetModuleParameters

then you will get the structure 

typedef struct _DEBUG_MODULE_PARAMETERS {
  ULONG64 Base;
  ULONG   Size;
  ULONG   TimeDateStamp;
  ULONG   Checksum;
  ULONG   Flags;
  ULONG   SymbolType;
  ULONG   ImageNameSize;
  ULONG   ModuleNameSize;
  ULONG   LoadedImageNameSize;
  ULONG   SymbolFileNameSize;
  ULONG   MappedImageNameSize;
  ULONG64 Reserved[2];
} DEBUG_MODULE_PARAMETERS, *PDEBUG_MODULE_PARAMETERS;