UefiCpuPkg/CpuDxe/CpuGdt.h

   1 /** @file
   2   C based implementation 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   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #ifndef _CPU_GDT_H_
  11 #define _CPU_GDT_H_
  12
  13 //
  14 // Local structure definitions
  15 //
  16
  17 #pragma pack (1)
  18
  19 //
  20 // Global Descriptor Entry structures
  21 //
  22
  23 typedef struct _GDT_ENTRY {
  24   UINT16 Limit15_0;
  25   UINT16 Base15_0;
  26   UINT8  Base23_16;
  27   UINT8  Type;
  28   UINT8  Limit19_16_and_flags;
  29   UINT8  Base31_24;
  30 } GDT_ENTRY;
  31
  32 typedef
  33 struct _GDT_ENTRIES {
  34   GDT_ENTRY Null;
  35   GDT_ENTRY Linear;
  36   GDT_ENTRY LinearCode;
  37   GDT_ENTRY SysData;
  38   GDT_ENTRY SysCode;
  39   GDT_ENTRY Spare4;
  40   GDT_ENTRY LinearData64;
  41   GDT_ENTRY LinearCode64;
  42   GDT_ENTRY Spare5;
  43 } GDT_ENTRIES;
  44
  45 #pragma pack ()
  46
  47 #define NULL_SEL          OFFSET_OF (GDT_ENTRIES, Null)
  48 #define LINEAR_SEL        OFFSET_OF (GDT_ENTRIES, Linear)
  49 #define LINEAR_CODE_SEL   OFFSET_OF (GDT_ENTRIES, LinearCode)
  50 #define SYS_DATA_SEL      OFFSET_OF (GDT_ENTRIES, SysData)
  51 #define SYS_CODE_SEL      OFFSET_OF (GDT_ENTRIES, SysCode)
  52 #define SPARE4_SEL        OFFSET_OF (GDT_ENTRIES, Spare4)
  53 #define LINEAR_DATA64_SEL OFFSET_OF (GDT_ENTRIES, LinearData64)
  54 #define LINEAR_CODE64_SEL OFFSET_OF (GDT_ENTRIES, LinearCode64)
  55 #define SPARE5_SEL        OFFSET_OF (GDT_ENTRIES, Spare5)
  56
  57 #if defined (MDE_CPU_IA32)
  58 #define CPU_CODE_SEL LINEAR_CODE_SEL
  59 #define CPU_DATA_SEL LINEAR_SEL
  60 #elif defined (MDE_CPU_X64)
  61 #define CPU_CODE_SEL LINEAR_CODE64_SEL
  62 #define CPU_DATA_SEL LINEAR_DATA64_SEL
  63 #else
  64 #error CPU type not supported for CPU GDT initialization!
  65 #endif
  66
  67 #endif // _CPU_GDT_H_
  68