ntdll: Set the WOW64 flag according to the server supported CPUs.

dlls/ntdll/ntdll_misc.h

@@ -66,6 +66,7 @@ extern void virtual_init_threading(void);
 
 /* server support */
 extern timeout_t server_start_time;
+extern unsigned int server_cpus;
 extern void server_init_process(void);
 extern NTSTATUS server_init_process_done(void);
 extern size_t server_init_thread( void *entry_point );

dlls/ntdll/process.c

@@ -305,10 +305,14 @@ NTSTATUS WINAPI NtQueryInformationProcess(
          else ret = STATUS_INFO_LENGTH_MISMATCH;
          break;
     case ProcessWow64Information:
-        if (ProcessInformationLength == 4)
+        if (ProcessInformationLength == sizeof(DWORD))
         {
-            memset(ProcessInformation, 0, ProcessInformationLength);
-            len = 4;
+#ifdef __i386__
+            *(DWORD *)ProcessInformation = (server_cpus & (1 << CPU_x86_64)) != 0;
+#else
+            *(DWORD *)ProcessInformation = FALSE;
+#endif
+            len = sizeof(DWORD);
         }
         else ret = STATUS_INFO_LENGTH_MISMATCH;
         break;

dlls/ntdll/server.c

@@ -90,6 +90,8 @@ static const enum cpu_type client_cpu = CPU_SPARC;
 #error Unsupported CPU
 #endif
 
+unsigned int server_cpus = 0;
+
 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 /* data structure used to pass an fd with sendmsg/recvmsg */
 struct cmsg_fd
@@ -1050,6 +1052,7 @@ size_t server_init_thread( void *entry_point )
         NtCurrentTeb()->ClientId.UniqueThread  = ULongToHandle(reply->tid);
         info_size         = reply->info_size;
         server_start_time = reply->server_start;
+        server_cpus       = reply->all_cpus;
     }
     SERVER_END_REQ;