UefiCpuPkg/CpuDxe/CpuGdt.h

   1 /** @file
   2   C based implemention of IA32 interrupt handling only
   3   requiring a minimal assembly interrupt entry point.
   4
   5   Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
   6   This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The 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 #ifndef _CPU_GDT_H_
  17 #define _CPU_GDT_H_
  18
  19 //
  20 // Local structure definitions
  21 //
  22
  23 #pragma pack (1)
  24
  25 //
  26 // Global Descriptor Entry structures
  27 //
  28
  29 typedef struct _GDT_ENTRY {
  30   UINT16 Limit15_0;
  31   UINT16 Base15_0;
  32   UINT8  Base23_16;
  33   UINT8  Type;
  34   UINT8  Limit19_16_and_flags;
  35   UINT8  Base31_24;
  36 } GDT_ENTRY;
  37
  38 typedef
  39 struct _GDT_ENTRIES {
  40   GDT_ENTRY Null;
  41   GDT_ENTRY Linear;
  42   GDT_ENTRY LinearCode;
  43   GDT_ENTRY SysData;
  44   GDT_ENTRY SysCode;
  45   GDT_ENTRY Spare4;
  46   GDT_ENTRY LinearData64;
  47   GDT_ENTRY LinearCode64;
  48   GDT_ENTRY Spare5;
  49 } GDT_ENTRIES;
  50
  51 #pragma pack ()
  52
  53 #define NULL_SEL          OFFSET_OF (GDT_ENTRIES, Null)
  54 #define LINEAR_SEL        OFFSET_OF (GDT_ENTRIES, Linear)
  55 #define LINEAR_CODE_SEL   OFFSET_OF (GDT_ENTRIES, LinearCode)
  56 #define SYS_DATA_SEL      OFFSET_OF (GDT_ENTRIES, SysData)
  57 #define SYS_CODE_SEL      OFFSET_OF (GDT_ENTRIES, SysCode)
  58 #define SPARE4_SEL        OFFSET_OF (GDT_ENTRIES, Spare4)
  59 #define LINEAR_DATA64_SEL OFFSET_OF (GDT_ENTRIES, LinearData64)
  60 #define LINEAR_CODE64_SEL OFFSET_OF (GDT_ENTRIES, LinearCode64)
  61 #define SPARE5_SEL        OFFSET_OF (GDT_ENTRIES, Spare5)
  62
  63 #if defined (MDE_CPU_IA32)
  64 #define CPU_CODE_SEL LINEAR_CODE_SEL
  65 #define CPU_DATA_SEL LINEAR_SEL
  66 #elif defined (MDE_CPU_X64)
  67 #define CPU_CODE_SEL LINEAR_CODE64_SEL
  68 #define CPU_DATA_SEL LINEAR_DATA64_SEL
  69 #else
  70 #error CPU type not supported for CPU GDT initialization!
  71 #endif
  72
  73 #endif // _CPU_GDT_H_
  74