ntoskrnl/ex/xipdisp.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            ntoskrnl/ex/xipdisp.c
   5  * PURPOSE:         eXecute In Place (XIP) Support.
   6  * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #include <debug.h>
  13
  14 /* GLOBALS *******************************************************************/
  15
  16 /* FUNCTIONS *****************************************************************/
  17
  18 NTSTATUS
  19 NTAPI
  20 XIPDispatch(IN ULONG DispatchCode,
  21             OUT PVOID Buffer,
  22             IN ULONG BufferSize)
  23 {
  24     UNIMPLEMENTED;
  25     return STATUS_NOT_IMPLEMENTED;
  26 }
  27
  28 PMEMORY_ALLOCATION_DESCRIPTOR
  29 NTAPI
  30 INIT_FUNCTION
  31 XIPpFindMemoryDescriptor(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
  32 {
  33     PLIST_ENTRY NextEntry;
  34     PMEMORY_ALLOCATION_DESCRIPTOR Descriptor = NULL;
  35
  36     /* Loop the memory descriptors */
  37     for (NextEntry = LoaderBlock->MemoryDescriptorListHead.Flink;
  38          NextEntry != &LoaderBlock->MemoryDescriptorListHead;
  39          NextEntry = NextEntry->Flink)
  40     {
  41         /* Get the current descriptor and check if it's the XIP ROM */
  42         Descriptor = CONTAINING_RECORD(NextEntry,
  43                                        MEMORY_ALLOCATION_DESCRIPTOR,
  44                                        ListEntry);
  45         if (Descriptor->MemoryType == LoaderXIPRom) return Descriptor;
  46     }
  47
  48     /* Nothing found if we got here */
  49     return NULL;
  50 }
  51
  52 VOID
  53 NTAPI
  54 INIT_FUNCTION
  55 XIPInit(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
  56 {
  57     PCHAR CommandLine, XipBoot, XipRom, XipMegs, XipVerbose, XipRam;
  58     PMEMORY_ALLOCATION_DESCRIPTOR XipDescriptor;
  59
  60     /* Get the command line */
  61     CommandLine = LoaderBlock->LoadOptions;
  62     if (!CommandLine) return;
  63
  64     /* Get XIP settings */
  65     XipBoot = strstr(CommandLine, "XIPBOOT");
  66     XipRam = strstr(CommandLine, "XIPRAM=");
  67     XipRom = strstr(CommandLine, "XIPROM=");
  68     XipMegs = strstr(CommandLine, "XIPMEGS=");
  69     XipVerbose = strstr(CommandLine, "XIPVERBOSE");
  70
  71     /* Check if this is a verbose boot */
  72     if (XipVerbose)
  73     {
  74         /* Print out our header */
  75         DbgPrint("\n\nXIP: debug timestamp at line %d in %s:   <<<%s %s>>>\n\n",
  76                  __LINE__,
  77                  __FILE__,
  78                  __DATE__,
  79                  __TIME__);
  80     }
  81
  82     /* Find the XIP memory descriptor */
  83     XipDescriptor = XIPpFindMemoryDescriptor(LoaderBlock);
  84     if (!XipDescriptor) return;
  85
  86     //
  87     // Make sure this is really XIP, and not RAM Disk -- also validate XIP
  88     // Basically, either this is a ROM boot or a RAM boot, but not both nor none
  89     //
  90     if (!((ULONG_PTR)XipRom ^ (ULONG_PTR)XipRam)) return;
  91
  92     /* FIXME: TODO */
  93     DPRINT1("ReactOS does not yet support eXecute In Place boot technology\n");
  94     DPRINT("%s MB requested (XIP = %s)\n", XipMegs, XipBoot);
  95 }
  96
  97 /* EOF */