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 = 0;
  13 ULONG LlbEnvHwMemSize = 0;
  14 ULONG LlbEnvRamDiskStart = 0;
  15 ULONG LlbEnvRamDiskSize = 0;
  16 ULONG LlbEnvHwRevision;
  17 CHAR LlbEnvCmdLine[256];
  18 CHAR LlbValueData[32];
  19
  20 VOID
  21 NTAPI
  22 LlbEnvParseArguments(IN PATAG Arguments)
  23 {
  24     PATAG Atag;
  25
  26     /* Parse the ATAGs */
  27     Atag = Arguments;
  28     while (Atag->Hdr.Size)
  29     {
  30         /* Check tag type */
  31         switch (Atag->Hdr.Tag)
  32         {
  33             case ATAG_CORE:
  34
  35                 /* Save page size */
  36                 LlbEnvHwPageSize = Atag->u.Core.PageSize;
  37                 break;
  38
  39             case ATAG_REVISION:
  40
  41                 /* Save page size */
  42                 LlbEnvHwRevision = Atag->u.Revision.Rev;
  43                 break;
  44
  45             case ATAG_MEM:
  46
  47                 /* Save RAM start and size */
  48                 if (!LlbEnvHwMemStart) LlbEnvHwMemStart = Atag->u.Mem.Start;
  49                 LlbEnvHwMemSize += Atag->u.Mem.Size;
  50                 break;
  51
  52             case ATAG_INITRD2:
  53
  54                 /* Save RAMDISK start and size */
  55                 LlbEnvRamDiskStart = Atag->u.InitRd2.Start;
  56                 LlbEnvRamDiskSize = Atag->u.InitRd2.Size;
  57
  58 #ifdef _BEAGLE_
  59                 /* Make sure it's 16MB-aligned */
  60                 LlbEnvRamDiskSize = (LlbEnvRamDiskSize + (16 * 1024 * 1024) - 1)
  61                                     &~ ((16 * 1024 * 1024) - 1);
  62
  63                 /* The RAMDISK actually starts 16MB later */
  64                 LlbEnvRamDiskStart += 16 * 1024 * 1024;
  65                 LlbEnvRamDiskSize  -= 16 * 1024 * 1024;
  66 #endif
  67                 break;
  68
  69             case ATAG_CMDLINE:
  70
  71                 /* Save command line */
  72                 strncpy(LlbEnvCmdLine,
  73                         Atag->u.CmdLine.CmdLine,
  74                         Atag->Hdr.Size * sizeof(ULONG));
  75                 break;
  76
  77             /* Nothing left to handle */
  78             case ATAG_NONE:
  79             default:
  80                 break;
  81         }
  82
  83         /* Next tag */
  84         Atag = (PATAG)((PULONG)Atag + Atag->Hdr.Size);
  85     }
  86
  87     /* For debugging */
  88     DbgPrint("[BOOTROM] Board Revision: %lx PageSize: %dKB RAM: %dMB CMDLINE: %s\n"
  89              "[RAMDISK] Base: %lx Size: %dMB\n",
  90              LlbEnvHwRevision,
  91              LlbEnvHwPageSize / 1024, LlbEnvHwMemSize / 1024 / 1024, LlbEnvCmdLine,
  92              LlbEnvRamDiskStart, LlbEnvRamDiskSize / 1024 / 1024);
  93 }
  94
  95 VOID
  96 NTAPI
  97 LlbEnvGetMemoryInformation(IN PULONG Base,
  98                            IN PULONG Size)
  99 {
 100     /* Return RAM information */
 101     *Base = LlbEnvHwMemStart;
 102     *Size = LlbEnvHwMemSize;
 103 }
 104
 105 BOOLEAN
 106 NTAPI
 107 LlbEnvGetRamDiskInformation(IN PULONG Base,
 108                             IN PULONG Size)
 109 {
 110     /* Do we have a ramdisk? */
 111     if (LlbEnvRamDiskSize == 0)
 112     {
 113         /* No */
 114         *Base = 0;
 115         *Size = 0;
 116         return FALSE;
 117     }
 118
 119     /* Return ramdisk information */
 120     *Base = LlbEnvRamDiskStart;
 121     *Size = LlbEnvRamDiskSize;
 122     return TRUE;
 123 }
 124
 125 PCHAR
 126 NTAPI
 127 LlbEnvRead(IN PCHAR ValueName)
 128 {
 129     PCHAR ValuePointer;
 130     ULONG Length = 0;
 131
 132     /* Search for the value name */
 133     ValuePointer = strstr(LlbEnvCmdLine, ValueName);
 134     if (ValuePointer)
 135     {
 136         /* Get the value data and its length */
 137         ValuePointer += strlen(ValueName) + 1;
 138         if (strchr(ValuePointer, ','))
 139         {
 140             /* Stop before next parameter */
 141             Length = strchr(ValuePointer, ',') - ValuePointer;
 142         }
 143         else
 144         {
 145             /* Stop before the string ends */
 146             Length = strlen(ValuePointer);
 147         }
 148
 149         /* Copy it */
 150         strncpy(LlbValueData, ValuePointer, Length);
 151     }
 152
 153     /* Terminate the data */
 154     LlbValueData[Length] = ANSI_NULL;
 155
 156     /* Return the data */
 157     return LlbValueData;
 158 }
 159
 160 /* EOF */
 161