1 files changed, 103 insertions, 0 deletions
diff --git a/private/mvdm/xms.486/xms.c b/private/mvdm/xms.486/xms.c
new file mode 100644
index 000000000..841513b42
--- /dev/null
+++ b/private/mvdm/xms.486/xms.c
@@ -0,0 +1,103 @@
+/*
+ *  xms.c - Main Module of XMS DLL.
+ *
+ *  Sudeepb 15-May-1991 Craeted
+ *  williamh 25-Sept-1992 added UMB support
+ *  williamh 10-10-1992 added A20 line support
+ */
+
+#include <xms.h>
+#include <suballoc.h>
+#include "umb.h"
+#include "memapi.h"
+
+/* XMSInit - XMS Initialiazation routine. (This name may change when XMS is
+ *       converted to DLL).
+ *
+ * Entry
+ *  None
+ *
+ * Exit
+ *  None
+ */
+
+ULONG xmsMemorySize = (ULONG)0;   // Total XMS meory in K
+
+extern BOOL VDMForWOW;
+
+PVOID ExtMemSA;
+
+BOOL XMSInit (int argc, char *argv[])
+{
+    DWORD   Size;
+    PVOID   Address;
+    ULONG   VdmAddress, XmsSize;
+    NTSTATUS Status;
+
+    if (!xmsMemorySize)
+        return FALSE;
+
+    Size = 0;
+    Address = NULL;
+    // commit all free UMBs.
+    ReserveUMB(UMB_OWNER_RAM, &Address, &Size);
+
+    XmsSize = xmsMemorySize * 1024 - (64*1024);
+
+#ifndef i386
+    Status = VdmAllocateVirtualMemory(&VdmAddress,
+                                      XmsSize,
+                                      FALSE);
+
+    if (Status == STATUS_NOT_IMPLEMENTED) {
+
+        // Old emulator, just assume base address
+#endif ; //i386
+        //
+        // Initialize the sub allocator
+        //
+        ExtMemSA = SAInitialize(
+            1024 * 1024 + 64*1024,
+            XmsSize,
+            xmsCommitBlock,
+            xmsDecommitBlock,
+            xmsMoveMemory
+            );
+
+#ifndef i386
+    } else {
+
+        //
+        // New emulator. Make sure the reserve worked
+        //
+
+        if (!NT_SUCCESS(Status)) {
+            ASSERT(FALSE);
+            return FALSE;
+        }
+       
+        //
+        // We only work correctly if emulator returned this value
+        //
+        if (VdmAddress != (1024 * 1024 + 64*1024)) {
+            ASSERT(FALSE);
+            return FALSE;
+        }
+
+        ExtMemSA = SAInitialize(
+            VdmAddress,
+            XmsSize,
+            VdmCommitVirtualMemory,
+            VdmDeCommitVirtualMemory,
+            xmsMoveMemory
+            );
+            
+    }
+#endif // i386
+
+    if (ExtMemSA == NULL) {
+        return FALSE;
+    }
+        
+    return TRUE;
+}