diff --git a/sys/sys_mmap.pas b/sys/sys_mmap.pas
index 3a32c882..d1e684f5 100644
--- a/sys/sys_mmap.pas
+++ b/sys/sys_mmap.pas
@@ -5,6 +5,9 @@ unit sys_mmap;
 
 interface
 
+uses
+ vm_mmap;
+
 const
  PROT_NONE       =$00; // no permissions
  PROT_READ       =$01; // pages can be read
@@ -71,6 +74,10 @@ const
  MADV_CORE      = 9; // revert to including pages in a core file
  MADV_PROTECT   =10; // protect process from pageout kill
 
+type
+ p_query_memory_prot=vm_mmap.p_query_memory_prot;
+ t_query_memory_prot=vm_mmap.t_query_memory_prot;
+
 function mmap(_addr :Pointer;
               _len  :QWORD;
               _prot :Integer;
@@ -82,11 +89,11 @@ function munmap(addr:Pointer;len:QWORD):Integer;
 function mprotect(addr:Pointer;len:QWORD;prot:Integer):Integer;
 function madvise(addr:Pointer;len:QWORD;behav:Integer):Integer;
 function mname(addr:Pointer;len:QWORD;name:PChar):Integer;
+function query_memory_protection(addr:Pointer;len:QWORD;info:p_query_memory_prot):Integer;
 
 implementation
 
 uses
- vm_mmap,
  trap,
  thr_error;
 
@@ -130,6 +137,13 @@ asm
  call  cerror
 end;
 
+function query_memory_protection(addr:Pointer;len:QWORD;info:p_query_memory_prot):Integer;  assembler; nostackframe;
+asm
+ movq  sys_query_memory_protection,%rax
+ call  fast_syscall
+ call  cerror
+end;
+
 
 end.
 
diff --git a/sys/test/project1.lpr b/sys/test/project1.lpr
index 680f4c1f..42ccdcb5 100644
--- a/sys/test/project1.lpr
+++ b/sys/test/project1.lpr
@@ -61,6 +61,7 @@ function _thread(parameter:pointer):ptrint;
 var
  td:p_kthread;
  p:Pointer;
+ qr:t_query_memory_prot;
 begin
  Result:=0;
  NtWaitForSingleObject(event,false,nil);
@@ -83,6 +84,9 @@ begin
  p:=mmap(Pointer($700000000),16*1024,PROT_CPU_ALL,MAP_ANON or MAP_FIXED,-1,0);
  Writeln(HexStr(p));
 
+ Result:=query_memory_protection(Pointer($700000000),16*1024,@qr);
+ Writeln(Result);
+
  p:=mmap(Pointer($700000000+16*1024),16*1024,PROT_CPU_ALL,MAP_ANON {or MAP_VOID} or MAP_FIXED,-1,0);
  Writeln(HexStr(p));
 
diff --git a/sys/vm/vm_mmap.pas b/sys/vm/vm_mmap.pas
index e1c6902d..44432c71 100644
--- a/sys/vm/vm_mmap.pas
+++ b/sys/vm/vm_mmap.pas
@@ -5,6 +5,15 @@ unit vm_mmap;
 
 interface
 
+type
+ p_query_memory_prot=^t_query_memory_prot;
+ t_query_memory_prot=packed record
+  start:Pointer;
+  __end:Pointer;
+  prot  :Integer;
+  eflags:Integer;
+ end;
+
 function sys_mmap(_addr :Pointer;
                   _len  :QWORD;
                   _prot :Integer;
@@ -16,6 +25,7 @@ function sys_munmap(addr:Pointer;len:QWORD):Integer;
 function sys_mprotect(addr:Pointer;len:QWORD;prot:Integer):Integer;
 function sys_madvise(addr:Pointer;len:QWORD;behav:Integer):Integer;
 function sys_mname(addr:Pointer;len:QWORD;name:PChar):Integer;
+function sys_query_memory_protection(addr:Pointer;len:QWORD;info:p_query_memory_prot):Integer;
 
 implementation
 
@@ -616,7 +626,36 @@ begin
  vm_map_set_name(@g_vmspace.vm_map,start,__end,@_name);
 end;
 
-
+function sys_query_memory_protection(addr:Pointer;len:QWORD;info:p_query_memory_prot):Integer;
+var
+ map:vm_map_t;
+ _addr:vm_offset_t;
+ __end:vm_offset_t;
+ entry:vm_map_entry_t;
+ data:t_query_memory_prot;
+begin
+ Result:=EINVAL;
+ _addr:=trunc_page(vm_offset_t(addr));
+ map:=@g_vmspace.vm_map;
+ __end:=vm_map_max(map);
+ if (_addr<__end) or (_addr=__end) then
+ begin
+  vm_map_lock(map);
+  if not vm_map_lookup_entry(map,_addr,@entry) then
+  begin
+   vm_map_unlock(map);
+   Result:=EACCES;
+  end else
+  begin
+   data.start:=Pointer(entry^.start);
+   data.__end:=Pointer(entry^.__end);
+   data.prot:=(entry^.max_protection and entry^.protection);
+   data.eflags:=entry^.eflags;
+   vm_map_unlock(map);
+   Result:=copyout(@data,info,SizeOf(t_query_memory_prot));
+  end;
+ end;
+end;
 
 
 end.
diff --git a/sys/vm/vm_object.pas b/sys/vm/vm_object.pas
index 66abc193..ecc1d1bf 100644
--- a/sys/vm/vm_object.pas
+++ b/sys/vm/vm_object.pas
@@ -60,8 +60,6 @@ const
  OBJPR_NOTMAPPED=$2; // Don't unmap pages.
  OBJPR_NOTWIRED =$4; // Don't remove wired pages.
 
-
-//function  vm_object_is_merges (_object:vm_object_t):Boolean;
 procedure vm_object_reference (_object:vm_object_t);
 function  vm_object_allocate  (t:objtype_t;size:vm_pindex_t):vm_object_t;
 procedure vm_object_deallocate(_object:vm_object_t);
@@ -158,19 +156,6 @@ begin
  FreeMem(_object);
 end;
 
-{
-function vm_object_is_merges(_object:vm_object_t):Boolean;
-begin
- if (_object=nil) then
- begin
-  Result:=True;
- end else
- begin
-  Result:=(obj_type(_object^.otype)=OBJT_DMEM);
- end;
-end;
-}
-
 procedure vm_object_reference(_object:vm_object_t);
 begin
  if (_object=nil) then Exit;
diff --git a/sys/vm/vm_pmap.pas b/sys/vm/vm_pmap.pas
index ecd20ef4..ab9aad03 100644
--- a/sys/vm/vm_pmap.pas
+++ b/sys/vm/vm_pmap.pas
@@ -222,6 +222,22 @@ begin
    base_old:=base_old+VM_MIN_GPU_ADDRESS;
   end;
 
+  //set old to readonly
+  r:=NtProtectVirtualMemory(
+      NtCurrentProcess,
+      @base_old,
+      @size,
+      PAGE_READONLY,
+      nil
+     );
+
+  if (r<>0) then
+  begin
+   Writeln('failed NtProtectVirtualMemory:',r);
+   Assert(false,'pmap_protect');
+  end;
+
+  //alloc new
   r:=NtAllocateVirtualMemory(
       NtCurrentProcess,
       @base_new,
@@ -237,6 +253,10 @@ begin
    Assert(false,'pmap_protect');
   end;
 
+  //move data
+  Move(base_old^,base_new^,size);
+
+  //free old
   r:=NtFreeVirtualMemory(
       NtCurrentProcess,
       @base_old,
@@ -279,15 +299,12 @@ var
 begin
  Writeln('pmap_madv_free:',HexStr(start,11),':',HexStr(__end,11),':',HexStr(prot,2));
 
+ //dont reset gpu mem
+ if is_gpu(prot) then Exit;
+
  base:=Pointer(trunc_page(start));
  size:=trunc_page(__end-start);
 
- if is_gpu(prot) then
- begin
-  //shift
-  base:=base+VM_MIN_GPU_ADDRESS;
- end;
-
  r:=NtAllocateVirtualMemory(
      NtCurrentProcess,
      @base,