From 4c80791d476c2bae7ce4e08f1c56525e2cbd364f Mon Sep 17 00:00:00 2001
From: Aleksandar Andrejevic <aandrejevic@reactos.org>
Date: Sun, 15 Dec 2013 04:15:03 +0000
Subject: [PATCH] [FAST486] Fix linear memory access when paging is enabled.

svn path=/branches/ntvdm/; revision=61274
---
 lib/fast486/common.inl | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/fast486/common.inl b/lib/fast486/common.inl
index 61e69a6ebaf..b9ef5872247 100644
--- a/lib/fast486/common.inl
+++ b/lib/fast486/common.inl
@@ -128,6 +128,7 @@ Fast486ReadLinearMemory(PFAST486_STATE State,
         ULONG Page;
         FAST486_PAGE_TABLE TableEntry;
         INT Cpl = Fast486GetCurrentPrivLevel(State);
+        ULONG BufferOffset = 0;
 
         for (Page = PAGE_ALIGN(LinearAddress);
              Page <= PAGE_ALIGN(LinearAddress + Size - 1);
@@ -152,6 +153,7 @@ Fast486ReadLinearMemory(PFAST486_STATE State,
             {
                 /* Start reading from the offset from the beginning of the page */
                 PageOffset = PAGE_OFFSET(LinearAddress);
+                PageLength -= PageOffset;
             }
 
             /* Check if this is the last page */
@@ -164,8 +166,10 @@ Fast486ReadLinearMemory(PFAST486_STATE State,
             /* Read the memory */
             State->MemReadCallback(State,
                                    (TableEntry.Address << 12) | PageOffset,
-                                   Buffer,
+                                   (PVOID)((ULONG_PTR)Buffer + BufferOffset),
                                    PageLength);
+
+            BufferOffset += PageLength;
         }
     }
     else
@@ -190,6 +194,7 @@ Fast486WriteLinearMemory(PFAST486_STATE State,
         ULONG Page;
         FAST486_PAGE_TABLE TableEntry;
         INT Cpl = Fast486GetCurrentPrivLevel(State);
+        ULONG BufferOffset = 0;
 
         for (Page = PAGE_ALIGN(LinearAddress);
              Page <= PAGE_ALIGN(LinearAddress + Size - 1);
@@ -216,6 +221,7 @@ Fast486WriteLinearMemory(PFAST486_STATE State,
             {
                 /* Start writing from the offset from the beginning of the page */
                 PageOffset = PAGE_OFFSET(LinearAddress);
+                PageLength -= PageOffset;
             }
 
             /* Check if this is the last page */
@@ -228,8 +234,10 @@ Fast486WriteLinearMemory(PFAST486_STATE State,
             /* Write the memory */
             State->MemWriteCallback(State,
                                     (TableEntry.Address << 12) | PageOffset,
-                                    Buffer,
+                                    (PVOID)((ULONG_PTR)Buffer + BufferOffset),
                                     PageLength);
+
+            BufferOffset += PageLength;
         }
     }
     else