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
  51                 /* Make sure it's 16MB-aligned */
  52                 LlbEnvRamDiskSize = (LlbEnvRamDiskSize + (16 * 1024 * 1024) - 1)
  53                                     &~ ((16 * 1024 * 1024) - 1);
  54
  55                 /* The RAMDISK actually starts 16MB later */
  56                 LlbEnvRamDiskStart += 16 * 1024 * 1024;
  57                 LlbEnvRamDiskSize  -= 16 * 1024 * 1024;
  58                 break;
  59
  60             case ATAG_CMDLINE:
  61
  62                 /* Save command line */
  63                 strncpy(LlbEnvCmdLine,
  64                         Atag->u.CmdLine.CmdLine,
  65                         Atag->Hdr.Size * sizeof(ULONG));
  66                 break;
  67
  68             /* Nothing left to handle */
  69             case ATAG_NONE:
  70             default:
  71                 return;
  72         }
  73
  74         /* Next tag */
  75         Atag = (PATAG)((PULONG)Atag + Atag->Hdr.Size);
  76     }
  77
  78     /* For debugging */
  79     DbgPrint("[BOOTROM] PageSize: %dKB RAM: %dMB CMDLINE: %s\n",
  80              LlbEnvHwPageSize / 1024, LlbEnvHwMemSize / 1024 / 1024, LlbEnvCmdLine);
  81 }
  82
  83 VOID
  84 NTAPI
  85 LlbEnvGetMemoryInformation(IN PULONG Base,
  86                            IN PULONG Size)
  87 {
  88     /* Return RAM information */
  89     *Base = LlbEnvHwMemStart;
  90     *Size = LlbEnvHwMemSize;
  91 }
  92
  93 BOOLEAN
  94 NTAPI
  95 LlbEnvGetRamDiskInformation(IN PULONG Base,
  96                             IN PULONG Size)
  97 {
  98     /* Do we have a ramdisk? */
  99     if (LlbEnvRamDiskSize == 0)
 100     {
 101         /* No */
 102         *Base = 0;
 103         *Size = 0;
 104         return FALSE;
 105     }
 106
 107     /* Return ramdisk information */
 108     *Base = LlbEnvRamDiskStart;
 109     *Size = LlbEnvRamDiskSize;
 110     return TRUE;
 111 }
 112
 113 PCHAR
 114 NTAPI
 115 LlbEnvRead(IN PCHAR ValueName)
 116 {
 117     PCHAR ValuePointer;
 118     ULONG Length = 0;
 119
 120     /* Search for the value name */
 121     ValuePointer = strstr(LlbEnvCmdLine, ValueName);
 122     if (ValuePointer)
 123     {
 124         /* Get the value data and its length */
 125         ValuePointer += strlen(ValueName) + 1;
 126         if (strchr(ValuePointer, ','))
 127         {
 128             /* Stop before next parameter */
 129             Length = strchr(ValuePointer, ',') - ValuePointer;
 130         }
 131         else
 132         {
 133             /* Stop before the string ends */
 134             Length = strlen(ValuePointer);
 135         }
 136
 137         /* Copy it */
 138         strncpy(LlbValueData, ValuePointer, Length);
 139     }
 140
 141     /* Terminate the data */
 142     LlbValueData[Length] = ANSI_NULL;
 143
 144     /* Return the data */
 145     return LlbValueData;
 146 }
 147
 148 /* EOF */
 149