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 PMEMORY_ALLOCATION_DESCRIPTOR
  19 NTAPI
  20 XIPpFindMemoryDescriptor(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
  21 {
  22     PLIST_ENTRY NextEntry;
  23     PMEMORY_ALLOCATION_DESCRIPTOR Descriptor = NULL;
  24
  25     /* Loop the memory descriptors */
  26     for (NextEntry = LoaderBlock->MemoryDescriptorListHead.Flink;
  27          NextEntry != &LoaderBlock->MemoryDescriptorListHead;
  28          NextEntry = NextEntry->Flink)
  29     {
  30         /* Get the current descriptor and check if it's the XIP ROM */
  31         Descriptor = CONTAINING_RECORD(NextEntry,
  32                                        MEMORY_ALLOCATION_DESCRIPTOR,
  33                                        ListEntry);
  34         if (Descriptor->MemoryType == LoaderXIPRom) return Descriptor;
  35     }
  36
  37     /* Nothing found if we got here */
  38     return NULL;
  39 }
  40
  41 VOID
  42 NTAPI
  43 XIPInit(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
  44 {
  45     PCHAR CommandLine, XipBoot, XipRom, XipMegs, XipVerbose, XipRam;
  46     PMEMORY_ALLOCATION_DESCRIPTOR XipDescriptor;
  47
  48     /* Get the command line */
  49     CommandLine = LoaderBlock->LoadOptions;
  50     if (!CommandLine) return;
  51
  52     /* Get XIP settings */
  53     XipBoot = strstr(CommandLine, "XIPBOOT");
  54     XipRam = strstr(CommandLine, "XIPRAM=");
  55     XipRom = strstr(CommandLine, "XIPROM=");
  56     XipMegs = strstr(CommandLine, "XIPMEGS=");
  57     XipVerbose = strstr(CommandLine, "XIPVERBOSE");
  58
  59     /* Check if this is a verbose boot */
  60     if (XipVerbose)
  61     {
  62         /* Print out our header */
  63         DbgPrint("\n\nXIP: debug timestamp at line %d in %s:   <<<%s %s>>>\n\n",
  64                  __LINE__,
  65                  __FILE__,
  66                  __DATE__,
  67                  __TIME__);
  68     }
  69
  70     /* Find the XIP memory descriptor */
  71     XipDescriptor = XIPpFindMemoryDescriptor(LoaderBlock);
  72     if (!XipDescriptor) return;
  73
  74     //
  75     // Make sure this is really XIP, and not RAM Disk -- also validate XIP
  76     // Basically, either this is a ROM boot or a RAM boot, but not both nor none
  77     //
  78     if (!((ULONG_PTR)XipRom ^ (ULONG_PTR)XipRam)) return;
  79
  80     /* FIXME: TODO */
  81     DPRINT1("ReactOS does not yet support eXecute In Place boot technology\n");
  82 }
  83
  84 /* EOF */