b26f0cf9ee
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
176 lines
3.2 KiB
C
176 lines
3.2 KiB
C
/** @file
|
|
Initialize GDT for Linux.
|
|
|
|
Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#include "LoadLinuxLib.h"
|
|
|
|
|
|
//
|
|
// Local structure definitions
|
|
//
|
|
|
|
#pragma pack (1)
|
|
|
|
//
|
|
// Global Descriptor Entry structures
|
|
//
|
|
|
|
typedef struct _GDT_ENTRY {
|
|
UINT16 Limit15_0;
|
|
UINT16 Base15_0;
|
|
UINT8 Base23_16;
|
|
UINT8 Type;
|
|
UINT8 Limit19_16_and_flags;
|
|
UINT8 Base31_24;
|
|
} GDT_ENTRY;
|
|
|
|
typedef
|
|
struct _GDT_ENTRIES {
|
|
GDT_ENTRY Null;
|
|
GDT_ENTRY Null2;
|
|
GDT_ENTRY Linear;
|
|
GDT_ENTRY LinearCode;
|
|
GDT_ENTRY TaskSegment;
|
|
GDT_ENTRY Spare4;
|
|
GDT_ENTRY Spare5;
|
|
} GDT_ENTRIES;
|
|
|
|
#pragma pack ()
|
|
|
|
STATIC GDT_ENTRIES *mGdt = NULL;
|
|
|
|
//
|
|
// Global descriptor table (GDT) Template
|
|
//
|
|
STATIC GDT_ENTRIES GdtTemplate = {
|
|
//
|
|
// Null
|
|
//
|
|
{
|
|
0x0, // limit 15:0
|
|
0x0, // base 15:0
|
|
0x0, // base 23:16
|
|
0x0, // type
|
|
0x0, // limit 19:16, flags
|
|
0x0, // base 31:24
|
|
},
|
|
//
|
|
// Null2
|
|
//
|
|
{
|
|
0x0, // limit 15:0
|
|
0x0, // base 15:0
|
|
0x0, // base 23:16
|
|
0x0, // type
|
|
0x0, // limit 19:16, flags
|
|
0x0, // base 31:24
|
|
},
|
|
//
|
|
// Linear
|
|
//
|
|
{
|
|
0x0FFFF, // limit 0xFFFFF
|
|
0x0, // base 0
|
|
0x0,
|
|
0x09A, // present, ring 0, data, expand-up, writable
|
|
0x0CF, // page-granular, 32-bit
|
|
0x0,
|
|
},
|
|
//
|
|
// LinearCode
|
|
//
|
|
{
|
|
0x0FFFF, // limit 0xFFFFF
|
|
0x0, // base 0
|
|
0x0,
|
|
0x092, // present, ring 0, data, expand-up, writable
|
|
0x0CF, // page-granular, 32-bit
|
|
0x0,
|
|
},
|
|
//
|
|
// TaskSegment
|
|
//
|
|
{
|
|
0x0, // limit 0
|
|
0x0, // base 0
|
|
0x0,
|
|
0x089, // ?
|
|
0x080, // ?
|
|
0x0,
|
|
},
|
|
//
|
|
// Spare4
|
|
//
|
|
{
|
|
0x0, // limit 0
|
|
0x0, // base 0
|
|
0x0,
|
|
0x0, // present, ring 0, data, expand-up, writable
|
|
0x0, // page-granular, 32-bit
|
|
0x0,
|
|
},
|
|
//
|
|
// Spare5
|
|
//
|
|
{
|
|
0x0, // limit 0
|
|
0x0, // base 0
|
|
0x0,
|
|
0x0, // present, ring 0, data, expand-up, writable
|
|
0x0, // page-granular, 32-bit
|
|
0x0,
|
|
},
|
|
};
|
|
|
|
/**
|
|
Initialize Global Descriptor Table.
|
|
|
|
**/
|
|
VOID
|
|
InitLinuxDescriptorTables (
|
|
VOID
|
|
)
|
|
{
|
|
//
|
|
// Allocate Runtime Data for the GDT
|
|
//
|
|
mGdt = AllocateRuntimePool (sizeof (GdtTemplate) + 8);
|
|
ASSERT (mGdt != NULL);
|
|
mGdt = ALIGN_POINTER (mGdt, 8);
|
|
|
|
//
|
|
// Initialize all GDT entries
|
|
//
|
|
CopyMem (mGdt, &GdtTemplate, sizeof (GdtTemplate));
|
|
|
|
}
|
|
|
|
/**
|
|
Initialize Global Descriptor Table.
|
|
|
|
**/
|
|
VOID
|
|
SetLinuxDescriptorTables (
|
|
VOID
|
|
)
|
|
{
|
|
IA32_DESCRIPTOR GdtPtr;
|
|
IA32_DESCRIPTOR IdtPtr;
|
|
|
|
//
|
|
// Write GDT register
|
|
//
|
|
GdtPtr.Base = (UINT32)(UINTN)(VOID*) mGdt;
|
|
GdtPtr.Limit = (UINT16) (sizeof (GdtTemplate) - 1);
|
|
AsmWriteGdtr (&GdtPtr);
|
|
|
|
IdtPtr.Base = (UINT32) 0;
|
|
IdtPtr.Limit = (UINT16) 0;
|
|
AsmWriteIdtr (&IdtPtr);
|
|
}
|
|
|