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 INIT_FUNCTION
  21 XIPpFindMemoryDescriptor(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
  22 {
  23     PLIST_ENTRY NextEntry;
  24     PMEMORY_ALLOCATION_DESCRIPTOR Descriptor = NULL;
  25
  26     /* Loop the memory descriptors */
  27     for (NextEntry = LoaderBlock->MemoryDescriptorListHead.Flink;
  28          NextEntry != &LoaderBlock->MemoryDescriptorListHead;
  29          NextEntry = NextEntry->Flink)
  30     {
  31         /* Get the current descriptor and check if it's the XIP ROM */
  32         Descriptor = CONTAINING_RECORD(NextEntry,
  33                                        MEMORY_ALLOCATION_DESCRIPTOR,
  34                                        ListEntry);
  35         if (Descriptor->MemoryType == LoaderXIPRom) return Descriptor;
  36     }
  37
  38     /* Nothing found if we got here */
  39     return NULL;
  40 }
  41
  42 VOID
  43 NTAPI
  44 INIT_FUNCTION
  45 XIPInit(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
  46 {
  47     PCHAR CommandLine, XipBoot, XipRom, XipMegs, XipVerbose, XipRam;
  48     PMEMORY_ALLOCATION_DESCRIPTOR XipDescriptor;
  49
  50     /* Get the command line */
  51     CommandLine = LoaderBlock->LoadOptions;
  52     if (!CommandLine) return;
  53
  54     /* Get XIP settings */
  55     XipBoot = strstr(CommandLine, "XIPBOOT");
  56     XipRam = strstr(CommandLine, "XIPRAM=");
  57     XipRom = strstr(CommandLine, "XIPROM=");
  58     XipMegs = strstr(CommandLine, "XIPMEGS=");
  59     XipVerbose = strstr(CommandLine, "XIPVERBOSE");
  60
  61     /* Check if this is a verbose boot */
  62     if (XipVerbose)
  63     {
  64         /* Print out our header */
  65         DbgPrint("\n\nXIP: debug timestamp at line %d in %s:   <<<%s %s>>>\n\n",
  66                  __LINE__,
  67                  __FILE__,
  68                  __DATE__,
  69                  __TIME__);
  70     }
  71
  72     /* Find the XIP memory descriptor */
  73     XipDescriptor = XIPpFindMemoryDescriptor(LoaderBlock);
  74     if (!XipDescriptor) return;
  75
  76     //
  77     // Make sure this is really XIP, and not RAM Disk -- also validate XIP
  78     // Basically, either this is a ROM boot or a RAM boot, but not both nor none
  79     //
  80     if (!((ULONG_PTR)XipRom ^ (ULONG_PTR)XipRam)) return;
  81
  82     /* FIXME: TODO */
  83     DPRINT1("ReactOS does not yet support eXecute In Place boot technology\n");
  84     DPRINT("%s MB requested (XIP = %s)\n", XipMegs, XipBoot);
  85 }
  86
  87 /* EOF */