IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Ipf/IpfThunk.i

   1 //// @file
   2 //
   3 // Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 //
   5 // This program and the accompanying materials
   6 // are licensed and made available under the terms and conditions
   7 // of the BSD License which accompanies this distribution.  The
   8 // full text of the license may be found at
   9 // http://opensource.org/licenses/bsd-license.php
  10 //
  11 // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13 //
  14 ////
  15
  16 #define NUM_REAL_GDT_ENTRIES                                            3
  17 #define LOW_STACK_SIZE                                                          (8*1024)            // 8k?
  18
  19 //
  20 // Low memory Thunk Structure
  21 //
  22 #define         Code                                                                    0
  23 #define         LowReverseThunkStart                                    Code + 4096
  24 #define         GdtDesc                                                                 LowReverseThunkStart + 4
  25 #define         IdtDesc                                                                 GdtDesc + 6
  26 #define         FlatSs                                                                  IdtDesc + 6
  27 #define         FlatEsp                                                                 FlatSs + 4
  28 #define         LowCodeSelector                                                 FlatEsp + 4
  29 #define         LowDataSelector                                                 LowCodeSelector + 4
  30 #define         LowStack                                                                LowDataSelector + 4
  31 #define         RealModeIdtDesc                                                 LowStack + 4
  32 #define         RealModeGdt                                                             RealModeIdtDesc + 6
  33 #define         RealModeGdtDesc                                                 RealModeGdt + (8 * NUM_REAL_GDT_ENTRIES)
  34 #define         RevRealDs                                                               RealModeGdtDesc + 6
  35 #define         RevRealSs                                                               RevRealDs + 2
  36 #define         RevRealEsp                                                              RevRealSs + 2
  37 #define         RevRealIdtDesc                                                  RevRealEsp + 4
  38 #define         RevFlatDataSelector                                             RevRealIdtDesc + 6
  39 #define         RevFlatStack                                                    RevFlatDataSelector + 2
  40 #define         Stack                                                                   RevFlatStack + 4
  41 #define         RevThunkStack                                                   Stack + LOW_STACK_SIZE
  42
  43 #define         EfiToLegacy16InitTable                                  RevThunkStack + LOW_STACK_SIZE
  44 #define         InitTableBiosLessThan1MB                                EfiToLegacy16InitTable
  45 #define         InitTableHiPmmMemory                                    InitTableBiosLessThan1MB + 4
  46 #define         InitTablePmmMemorySizeInBytes                   InitTableHiPmmMemory + 4
  47 #define         InitTableReverseThunkCallSegment                InitTablePmmMemorySizeInBytes + 4
  48 #define         InitTableReverseThunkCallOffset                 InitTableReverseThunkCallSegment + 2
  49 #define         InitTableNumberE820Entries                              InitTableReverseThunkCallOffset + 2
  50 #define         InitTableOsMemoryAbove1Mb                               InitTableNumberE820Entries + 4
  51 #define         InitTableThunkStart                                             InitTableOsMemoryAbove1Mb + 4
  52 #define         InitTableThunkSizeInBytes                               InitTableThunkStart + 4
  53 #define         InitTable16InitTableEnd                                 InitTableThunkSizeInBytes + 4
  54
  55 #define         EfiToLegacy16BootTable                                  InitTable16InitTableEnd
  56 #define         BootTableBiosLessThan1MB                                EfiToLegacy16BootTable
  57 #define         BootTableHiPmmMemory                                    BootTableBiosLessThan1MB + 4
  58 #define         BootTablePmmMemorySizeInBytes                   BootTableHiPmmMemory + 4
  59 #define         BootTableReverseThunkCallSegment                BootTablePmmMemorySizeInBytes + 4
  60 #define         BootTableReverseThunkCallOffset                 BootTableReverseThunkCallSegment + 2
  61 #define         BootTableNumberE820Entries                              BootTableReverseThunkCallOffset + 2
  62 #define         BootTableOsMemoryAbove1Mb                               BootTableNumberE820Entries + 4
  63 #define         BootTableThunkStart                                             BootTableOsMemoryAbove1Mb + 4
  64 #define         BootTableThunkSizeInBytes                               BootTableThunkStart + 4
  65 #define         EfiToLegacy16BootTableEnd                               BootTableThunkSizeInBytes + 4
  66
  67 #define         InterruptRedirectionCode                                EfiToLegacy16BootTableEnd
  68 #define         PciHandler                                                              InterruptRedirectionCode + 32
  69
  70
  71 //
  72 // Register Sets (16 Bit)
  73 //
  74
  75 #define         AX              0
  76 #define         BX              2
  77 #define         CX              4
  78 #define         DX              6
  79 #define         SI              8
  80 #define         DI              10
  81 #define         Flags   12
  82 #define         ES              14
  83 #define         CS              16
  84 #define         SS              18
  85 #define         DS              20
  86 #define         BP              22
  87
  88
  89