MdeModulePkg/Universal/DebugSupportDxe/Ipf/Ds64Macros.i

   1 /// @file
   2 ///  This is set of macros used in calculating offsets in the IVT.
   3 ///
   4 /// Copyright (c) 2006 - 2008, Intel Corporation
   5 /// All rights reserved. This program and the accompanying materials
   6 /// are licensed and made available under the terms and conditions of the BSD License
   7 /// which accompanies this distribution.  The full text of the license may be found at
   8 /// http://opensource.org/licenses/bsd-license.php
   9 ///
  10 /// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 /// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 ///
  13 /// Module Name: Ds64Macros.i
  14 ///
  15 ///
  16
  17
  18 #define EXCPT_EXTERNAL_INTERRUPT 12
  19 #define MASK_0_4        0x000000000000001F  // mask bits 0 through 4
  20 #define SLOT0           0
  21 #define SLOT1           1
  22 #define SLOT2           2
  23
  24 #define PSR_DT          17
  25 #define PSR_TB          26
  26 #define PSR_RT          27
  27 #define PSR_IS          34
  28 #define PSR_IT          36
  29 #define PSR_IC          13
  30 #define PSR_I           14
  31 #define PSR_SS          40
  32 #define PSR_BN          44
  33 #define PSR_RI_MASK     0x60000000000
  34
  35 #define EXCPT_EXTERNAL_INTERRUPT 12
  36
  37 #define SCRATCH_REG0    r23
  38 #define SCRATCH_REG1    r24
  39 #define SCRATCH_REG2    r25
  40 #define SCRATCH_REG3    r26
  41 #define SCRATCH_REG4    r27
  42 #define SCRATCH_REG5    r28
  43 #define SCRATCH_REG6    r29
  44 #define PR_REG          r30
  45 #define B0_REG          r31
  46
  47
  48 // EXT_INT_OFFSET is the offset of the external interrupt entry in the IVT
  49 #define EXT_INT_ENTRY_OFFSET    0x03000
  50
  51 // PATCH_ENTRY_OFFSET is the offset into the IVT of the entry that is coopted (stolen)
  52 // for use by the handler.  The entire entry is restored when the handler is
  53 // unloaded.
  54 #define PATCH_ENTRY_OFFSET      0x03400
  55
  56 // PATCH_CODE_SIZE is the size of patch code
  57 #define PATCH_CODE_SIZE       (EndPatchCode - PatchCode)
  58
  59 // A hard coded branch back into the external interrupt IVT entry's second bundle
  60 // is put here, just in case the original bundle zero did not have a branch
  61 // This is the last bundle in the reserved IVT entry
  62 #define FAILSAFE_BRANCH_OFFSET  (PATCH_ENTRY_OFFSET + 0x400 - 0x10)
  63
  64 // the original external interrupt IVT entry bundle zero is copied and relocated
  65 // here... also in the reserved IVT entry
  66 // This is the second-to-last bundle in the reserved IVT entry
  67 #define RELOCATED_EXT_INT       (PATCH_ENTRY_OFFSET + 0x400 - 0x20)
  68
  69 // The patch is actually stored at the end of IVT:PATCH_ENTRY.  The PATCH_OFFSET
  70 // is the offset into IVT where the patch is actually stored.  It is carefully
  71 // located so that when we run out of patch code, the next bundle is the
  72 // relocated bundle 0 from the original external interrupt handler
  73 #define PATCH_OFFSET            (PATCH_ENTRY_OFFSET + 0x400 - ( EndPatchCode - PatchCode ) - 0x20)
  74
  75 #define PATCH_RETURN_OFFSET     (PATCH_ENTRY_OFFSET + 0x400 - ( EndPatchCode - PatchCodeRet ) - 0x20)
  76
  77 // PATCH_BRANCH is used only in the new bundle that is placed at the beginning
  78 // of the external interrupt IVT entry.
  79 #define PATCH_BRANCH            (PATCH_OFFSET - EXT_INT_ENTRY_OFFSET)
  80