[tkreuzer] 48565: [NTOSKRNL] - Implement support for /BURNMEMORY option. - Don't stop boot on bad memory type Patch by Jay Smith, modified by Aleksey, even more modified by me. See issue #4957 for more details.

Author: tkreuzer
Date: Thu Aug 19 08:50:23 2010
New Revision: 48565

URL: http://svn.reactos.org/svn/reactos?rev=48565&view=rev
Log:
[NTOSKRNL]
- Implement support for /BURNMEMORY option.
- Don't stop boot on bad memory type
Patch by Jay Smith, modified by Aleksey, even more modified by me.

See issue #4957 for more details.

Modified:
    trunk/reactos/ntoskrnl/ex/init.c
    trunk/reactos/ntoskrnl/mm/ARM3/mminit.c

Modified: trunk/reactos/ntoskrnl/ex/init.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ex/init.c?rev=485…
==============================================================================
--- trunk/reactos/ntoskrnl/ex/init.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/ex/init.c [iso-8859-1] Thu Aug 19 08:50:23 2010
@@ -817,6 +817,51 @@
 
 VOID
 NTAPI
+ExBurnMemory(IN PLOADER_PARAMETER_BLOCK LoaderBlock,
+             IN ULONG PagesToDestroy,
+             IN TYPE_OF_MEMORY MemoryType)
+{
+    PLIST_ENTRY ListEntry;
+    PMEMORY_ALLOCATION_DESCRIPTOR MemDescriptor;
+
+    DPRINT1("Burn RAM amount: %d pages\n", PagesToDestroy);
+
+    /* Loop the memory descriptors, beginning at the end */
+    for (ListEntry = LoaderBlock->MemoryDescriptorListHead.Blink;
+         ListEntry != &LoaderBlock->MemoryDescriptorListHead;
+         ListEntry = ListEntry->Blink)
+    {
+        /* Get the memory descriptor structure */
+        MemDescriptor = CONTAINING_RECORD(ListEntry,
+                                          MEMORY_ALLOCATION_DESCRIPTOR,
+                                          ListEntry);
+
+        /* Is memory free there or is it temporary? */
+        if (MemDescriptor->MemoryType == LoaderFree ||
+            MemDescriptor->MemoryType == LoaderFirmwareTemporary)
+        {
+            /* Check if the descriptor has more pages than we want */
+            if (MemDescriptor->PageCount > PagesToDestroy)
+            {
+                /* Change block's page count, ntoskrnl doesn't care much */
+                MemDescriptor->PageCount -= PagesToDestroy;
+                break;
+            }
+            else
+            {
+                /* Change block type */
+                MemDescriptor->MemoryType = MemoryType;
+                PagesToDestroy -= MemDescriptor->PageCount;
+
+                /* Check if we are done */
+                if (PagesToDestroy == 0) break;
+            }
+        }
+    }
+}
+
+VOID
+NTAPI
 ExpInitializeExecutive(IN ULONG Cpu,
                        IN PLOADER_PARAMETER_BLOCK LoaderBlock)
 {
@@ -919,12 +964,7 @@
             {
                 /* Read the number of pages we'll use */
                 PerfMemUsed = atol(PerfMem + 1) * (1024 * 1024 / PAGE_SIZE);
-                if (PerfMem)
-                {
-                    /* FIXME: TODO */
-                    DPRINT1("Burnable memory support not yet present."
-                            "/BURNMEM option ignored.\n");
-                }
+                if (PerfMemUsed) ExBurnMemory(LoaderBlock, PerfMemUsed, LoaderBad);
             }
         }
     }

Modified: trunk/reactos/ntoskrnl/mm/ARM3/mminit.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/mminit.c?…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/mminit.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/mminit.c [iso-8859-1] Thu Aug 19 08:50:23 2010
@@ -831,8 +831,7 @@
             /* Check for bad RAM */
             case LoaderBad:
             
-                DPRINT1("You have damaged RAM modules. Stopping boot\n");
-                while (TRUE);
+                DPRINT1("You either have specified /BURNMEMORY or damaged RAM
modules.\n");
                 break;
 
             /* Check for free RAM */