From e611b132f9b8abe35b362e5870b74bce94a1e58e Mon Sep 17 00:00:00 2001
From: Adam <you@example.com>
Date: Sat, 16 May 2020 20:51:50 -0700
Subject: initial commit

---
 private/nw/rdr/deviosup.c | 153 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 private/nw/rdr/deviosup.c

(limited to 'private/nw/rdr/deviosup.c')

diff --git a/private/nw/rdr/deviosup.c b/private/nw/rdr/deviosup.c
new file mode 100644
index 000000000..1ff83c50f
--- /dev/null
+++ b/private/nw/rdr/deviosup.c
@@ -0,0 +1,153 @@
+/*++
+
+Copyright (c) 1989  Microsoft Corporation
+
+Module Name:
+
+    deviosup.c
+
+Abstract:
+
+    This module implements the memory locking routines for the netware
+    redirector.
+
+Author:
+
+    Manny Weiser (mannyw)   10-Mar-1993
+
+Revision History:
+
+--*/
+
+#include "procs.h"
+
+//
+// Local debug trace level
+//
+
+#define Dbg                              (DEBUG_TRACE_DEVIOSUP)
+
+#ifdef ALLOC_PRAGMA
+#pragma alloc_text( PAGE, NwMapUserBuffer )
+#pragma alloc_text( PAGE, NwLockUserBuffer )
+#endif
+
+
+VOID
+NwMapUserBuffer (
+    IN OUT PIRP Irp,
+    IN KPROCESSOR_MODE AccessMode,
+    OUT PVOID *UserBuffer
+    )
+
+/*++
+
+Routine Description:
+
+    This routine obtains a usable virtual address for the user buffer
+    for the current I/O request in the specified mode.
+
+Arguments:
+
+    Irp - Pointer to the Irp for the request.
+
+    AccessMode - UserMode or KernelMode.
+
+    UserBuffer - Returns pointer to mapped user buffer.
+
+Return Value:
+
+    None.
+
+--*/
+
+{
+    PAGED_CODE();
+
+    AccessMode;
+
+    //
+    // If there is no Mdl, then we must be in the Fsd, and we can simply
+    // return the UserBuffer field from the Irp.
+    //
+
+    if (Irp->MdlAddress == NULL) {
+
+        *UserBuffer = Irp->UserBuffer;
+        return;
+    }
+
+    //
+    // Get a system virtual address for the buffer.
+    //
+
+    *UserBuffer = MmGetSystemAddressForMdl( Irp->MdlAddress );
+    return;
+}
+
+
+VOID
+NwLockUserBuffer (
+    IN OUT PIRP Irp,
+    IN LOCK_OPERATION Operation,
+    IN ULONG BufferLength
+    )
+
+/*++
+
+Routine Description:
+
+    This routine locks the specified buffer for the specified type of
+    access.  The file system requires this routine since it does not
+    ask the I/O system to lock its buffers for direct I/O.  This routine
+    may only be called from the FSD while still in the user context.
+
+Arguments:
+
+    Irp - Pointer to the IRP for which the buffer is to be locked.
+
+    Operation - IoWriteAccess for read operations, or IoReadAccess for
+                write operations.
+
+    BufferLength - Length of user buffer.
+
+Return Value:
+
+    None
+
+--*/
+
+{
+    PMDL mdl;
+
+    PAGED_CODE();
+
+    if (Irp->MdlAddress == NULL) {
+
+        //
+        // This read is bound for the current process.  Perform the
+        // same functions as above, only do not switch processes.
+        //
+
+        mdl = IoAllocateMdl( Irp->UserBuffer, BufferLength, FALSE, TRUE, Irp );
+
+        if (mdl == NULL) {
+
+            ExRaiseStatus( STATUS_INSUFFICIENT_RESOURCES );
+        }
+
+        try {
+
+            MmProbeAndLockPages( mdl,
+                                 Irp->RequestorMode,
+                                 Operation );
+
+        } except(EXCEPTION_EXECUTE_HANDLER) {
+
+            IoFreeMdl( mdl );
+            Irp->MdlAddress = NULL;
+            ExRaiseStatus( FsRtlNormalizeNtstatus( GetExceptionCode(),
+                                                   STATUS_INVALID_USER_BUFFER ));
+        }
+    }
+}
-- 
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