diff --git a/winsup/cygwin/autoload.cc b/winsup/cygwin/autoload.cc
index 8f2fcc1cd..613a0199c 100644
--- a/winsup/cygwin/autoload.cc
+++ b/winsup/cygwin/autoload.cc
@@ -597,6 +597,9 @@ LoadDLLfunc (QueryInterruptTime, 4, KernelBase)
 LoadDLLfunc (QueryInterruptTimePrecise, 4, KernelBase)
 LoadDLLfunc (QueryUnbiasedInterruptTime, 4, KernelBase)
 LoadDLLfunc (QueryUnbiasedInterruptTimePrecise, 4, KernelBase)
+LoadDLLfunc (VirtualAlloc2, 28, kernelbase)
+
+LoadDLLfunc (NtMapViewOfSectionEx, 36, ntdll)
 
 /* ldap functions are cdecl! */
 #pragma push_macro ("mangle")
diff --git a/winsup/cygwin/ntdll.h b/winsup/cygwin/ntdll.h
index af1ed5f8d..5c6552751 100644
--- a/winsup/cygwin/ntdll.h
+++ b/winsup/cygwin/ntdll.h
@@ -1427,6 +1427,9 @@ extern "C"
   NTSTATUS NTAPI NtMapViewOfSection (HANDLE, HANDLE, PVOID *, ULONG_PTR, SIZE_T,
 				     PLARGE_INTEGER, PSIZE_T, SECTION_INHERIT,
 				     ULONG, ULONG);
+  NTSTATUS NTAPI NtMapViewOfSectionEx (HANDLE, HANDLE, PVOID *, PLARGE_INTEGER,
+				       PSIZE_T, ULONG, ULONG,
+				       PMEM_EXTENDED_PARAMETER, ULONG);
   NTSTATUS NTAPI NtNotifyChangeDirectoryFile (HANDLE, HANDLE, PIO_APC_ROUTINE,
 					      PVOID, PIO_STATUS_BLOCK,
 					      PFILE_NOTIFY_INFORMATION, ULONG,
diff --git a/winsup/cygwin/wincap.cc b/winsup/cygwin/wincap.cc
index 922705e65..4d136007f 100644
--- a/winsup/cygwin/wincap.cc
+++ b/winsup/cygwin/wincap.cc
@@ -45,6 +45,7 @@ wincaps wincap_vista __attribute__((section (".cygwin_dll_common"), shared)) = {
     has_con_broken_csi3j:false,
     has_con_broken_il_dl:false,
     has_con_esc_rep:false,
+    has_extended_mem_api:false,
   },
 };
 
@@ -75,6 +76,7 @@ wincaps wincap_7 __attribute__((section (".cygwin_dll_common"), shared)) = {
     has_con_broken_csi3j:false,
     has_con_broken_il_dl:false,
     has_con_esc_rep:false,
+    has_extended_mem_api:false,
   },
 };
 
@@ -105,6 +107,7 @@ wincaps wincap_8 __attribute__((section (".cygwin_dll_common"), shared)) = {
     has_con_broken_csi3j:false,
     has_con_broken_il_dl:false,
     has_con_esc_rep:false,
+    has_extended_mem_api:false,
   },
 };
 
@@ -135,6 +138,7 @@ wincaps wincap_8_1 __attribute__((section (".cygwin_dll_common"), shared)) = {
     has_con_broken_csi3j:false,
     has_con_broken_il_dl:false,
     has_con_esc_rep:false,
+    has_extended_mem_api:false,
   },
 };
 
@@ -165,6 +169,7 @@ wincaps  wincap_10_1507 __attribute__((section (".cygwin_dll_common"), shared))
     has_con_broken_csi3j:false,
     has_con_broken_il_dl:false,
     has_con_esc_rep:false,
+    has_extended_mem_api:false,
   },
 };
 
@@ -195,6 +200,7 @@ wincaps wincap_10_1703 __attribute__((section (".cygwin_dll_common"), shared)) =
     has_con_broken_csi3j:false,
     has_con_broken_il_dl:false,
     has_con_esc_rep:false,
+    has_extended_mem_api:false,
   },
 };
 
@@ -225,6 +231,7 @@ wincaps wincap_10_1709 __attribute__((section (".cygwin_dll_common"), shared)) =
     has_con_broken_csi3j:false,
     has_con_broken_il_dl:false,
     has_con_esc_rep:false,
+    has_extended_mem_api:false,
   },
 };
 
@@ -255,6 +262,7 @@ wincaps wincap_10_1803 __attribute__((section (".cygwin_dll_common"), shared)) =
     has_con_broken_csi3j:false,
     has_con_broken_il_dl:false,
     has_con_esc_rep:false,
+    has_extended_mem_api:true,
   },
 };
 
@@ -285,6 +293,7 @@ wincaps wincap_10_1809 __attribute__((section (".cygwin_dll_common"), shared)) =
     has_con_broken_csi3j:true,
     has_con_broken_il_dl:false,
     has_con_esc_rep:false,
+    has_extended_mem_api:true,
   },
 };
 
@@ -315,6 +324,7 @@ wincaps wincap_10_1903 __attribute__((section (".cygwin_dll_common"), shared)) =
     has_con_broken_csi3j:false,
     has_con_broken_il_dl:true,
     has_con_esc_rep:true,
+    has_extended_mem_api:true,
   },
 };
 
diff --git a/winsup/cygwin/wincap.h b/winsup/cygwin/wincap.h
index 6d7a1eae6..cf13de535 100644
--- a/winsup/cygwin/wincap.h
+++ b/winsup/cygwin/wincap.h
@@ -39,6 +39,7 @@ struct wincaps
     unsigned has_con_broken_csi3j		: 1;
     unsigned has_con_broken_il_dl		: 1;
     unsigned has_con_esc_rep			: 1;
+    unsigned has_extended_mem_api		: 1;
   };
 };
 
@@ -101,6 +102,7 @@ public:
   bool	IMPLEMENT (has_con_broken_csi3j)
   bool	IMPLEMENT (has_con_broken_il_dl)
   bool	IMPLEMENT (has_con_esc_rep)
+  bool	IMPLEMENT (has_extended_mem_api)
 
   void disable_case_sensitive_dirs ()
   {
diff --git a/winsup/cygwin/winlean.h b/winsup/cygwin/winlean.h
index 9b30b6557..2ee4aaff4 100644
--- a/winsup/cygwin/winlean.h
+++ b/winsup/cygwin/winlean.h
@@ -94,4 +94,55 @@ details. */
 #define GetWindowsDirectoryW dont_use_GetWindowsDirectory
 #define GetWindowsDirectoryA dont_use_GetWindowsDirectory
 
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Define extended memory API here as long as not available from mingw-w64. */
+
+typedef struct _MEM_ADDRESS_REQUIREMENTS
+{
+  PVOID LowestStartingAddress;
+  PVOID HighestEndingAddress;
+  SIZE_T Alignment;
+} MEM_ADDRESS_REQUIREMENTS, *PMEM_ADDRESS_REQUIREMENTS;
+
+typedef enum MEM_EXTENDED_PARAMETER_TYPE
+{
+  MemExtendedParameterInvalidType = 0,
+  MemExtendedParameterAddressRequirements,
+  MemExtendedParameterNumaNode,
+  MemExtendedParameterPartitionHandle,
+  MemExtendedParameterUserPhysicalHandle,
+  MemExtendedParameterAttributeFlags,
+  MemExtendedParameterMax
+} MEM_EXTENDED_PARAMETER_TYPE, *PMEM_EXTENDED_PARAMETER_TYPE;
+
+#define MEM_EXTENDED_PARAMETER_TYPE_BITS 8
+
+typedef struct DECLSPEC_ALIGN(8) MEM_EXTENDED_PARAMETER
+{
+  struct
+  {
+      DWORD64 Type : MEM_EXTENDED_PARAMETER_TYPE_BITS;
+      DWORD64 Reserved : 64 - MEM_EXTENDED_PARAMETER_TYPE_BITS;
+  };
+  union
+  {
+      DWORD64 ULong64;
+      PVOID Pointer;
+      SIZE_T Size;
+      HANDLE Handle;
+      DWORD ULong;
+  };
+} MEM_EXTENDED_PARAMETER, *PMEM_EXTENDED_PARAMETER;
+
+PVOID VirtualAlloc2 (HANDLE, PVOID, SIZE_T, ULONG, ULONG,
+		     PMEM_EXTENDED_PARAMETER, ULONG);
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /*_WINLEAN_H*/