reactos/boot/armllb/envir.c

   1 /*
   2  * PROJECT:         ReactOS Boot Loader
   3  * LICENSE:         BSD - See COPYING.ARM in the top level directory
   4  * FILE:            boot/armllb/envir.c
   5  * PURPOSE:         LLB Environment Variable Routines
   6  * PROGRAMMERS:     ReactOS Portable Systems Group
   7  */
   8
   9 #include "precomp.h"
  10
  11 ULONG LlbEnvHwPageSize;
  12 ULONG LlbEnvHwMemStart;
  13 ULONG LlbEnvHwMemSize;
  14 ULONG LlbEnvRamDiskStart;
  15 ULONG LlbEnvRamDiskSize;
  16 CHAR LlbEnvCmdLine[256];
  17 CHAR LlbValueData[32];
  18
  19 VOID
  20 NTAPI
  21 LlbEnvParseArguments(IN PATAG Arguments)
  22 {
  23     PATAG Atag;
  24
  25     /* Parse the ATAGs */
  26     Atag = Arguments;
  27     while (Atag->Hdr.Size)
  28     {
  29         /* Check tag type */
  30         switch (Atag->Hdr.Tag)
  31         {
  32             case ATAG_CORE:
  33
  34                 /* Save page size */
  35                 LlbEnvHwPageSize = Atag->u.Core.PageSize;
  36                 break;
  37
  38             case ATAG_MEM:
  39
  40                 /* Save RAM start and size */
  41                 LlbEnvHwMemStart = Atag->u.Mem.Start;
  42                 LlbEnvHwMemSize = Atag->u.Mem.Size;
  43                 break;
  44
  45             case ATAG_INITRD2:
  46
  47                 /* Save RAMDISK start and size */
  48                 LlbEnvRamDiskStart = Atag->u.InitRd2.Start;
  49                 LlbEnvRamDiskSize = Atag->u.InitRd2.Size;
  50                 break;
  51
  52             case ATAG_CMDLINE:
  53
  54                 /* Save command line */
  55                 strncpy(LlbEnvCmdLine,
  56                         Atag->u.CmdLine.CmdLine,
  57                         Atag->Hdr.Size * sizeof(ULONG));
  58                 break;
  59
  60             /* Nothing left to handle */
  61             case ATAG_NONE:
  62             default:
  63                 return;
  64         }
  65
  66         /* Next tag */
  67         Atag = (PATAG)((PULONG)Atag + Atag->Hdr.Size);
  68     }
  69
  70     /* For debugging */
  71     DbgPrint("[BOOTROM] PageSize: %dKB RAM: %dMB CMDLINE: %s\n",
  72              LlbEnvHwPageSize / 1024, LlbEnvHwMemSize / 1024 / 1024, LlbEnvCmdLine);
  73 }
  74
  75 VOID
  76 NTAPI
  77 LlbEnvGetMemoryInformation(IN PULONG Base,
  78                            IN PULONG Size)
  79 {
  80     /* Return RAM information */
  81     *Base = LlbEnvHwMemStart;
  82     *Size = LlbEnvHwMemSize;
  83 }
  84
  85 BOOLEAN
  86 NTAPI
  87 LlbEnvGetRamDiskInformation(IN PULONG Base,
  88                             IN PULONG Size)
  89 {
  90     /* Do we have a ramdisk? */
  91     if (LlbEnvRamDiskSize == 0)
  92     {
  93         /* No */
  94         *Base = 0;
  95         *Size = 0;
  96         return FALSE;
  97     }
  98
  99     /* Return ramdisk information */
 100     *Base = LlbEnvRamDiskStart;
 101     *Size = LlbEnvRamDiskSize;
 102     return TRUE;
 103 }
 104
 105 PCHAR
 106 NTAPI
 107 LlbEnvRead(IN PCHAR ValueName)
 108 {
 109     PCHAR ValuePointer;
 110     ULONG Length = 0;
 111
 112     /* Search for the value name */
 113     ValuePointer = strstr(LlbEnvCmdLine, ValueName);
 114     if (ValuePointer)
 115     {
 116         /* Get the value data and its length */
 117         ValuePointer += strlen(ValueName) + 1;
 118         if (strchr(ValuePointer, ','))
 119         {
 120             /* Stop before next parameter */
 121             Length = strchr(ValuePointer, ',') - ValuePointer;
 122         }
 123         else
 124         {
 125             /* Stop before the string ends */
 126             Length = strlen(ValuePointer);
 127         }
 128
 129         /* Copy it */
 130         strncpy(LlbValueData, ValuePointer, Length);
 131     }
 132
 133     /* Terminate the data */
 134     LlbValueData[Length] = ANSI_NULL;
 135
 136     /* Return the data */
 137     return LlbValueData;
 138 }
 139
 140 /* EOF */
 141