NetworkPkg: HttpDxe sometimes free a pointer twice

[mirror_edk2.git] / UefiCpuPkg / CpuDxe / CpuGdt.c

/** @file\r
  C based implemention of IA32 interrupt handling only\r
  requiring a minimal assembly interrupt entry point.\r
\r
  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "CpuDxe.h"\r
#include "CpuGdt.h"\r
\r
//\r
// Global descriptor table (GDT) Template\r
//\r
STATIC GDT_ENTRIES GdtTemplate = {\r
  //\r
  // NULL_SEL\r
  //\r
  {\r
    0x0,            // limit 15:0\r
    0x0,            // base 15:0\r
    0x0,            // base 23:16\r
    0x0,            // type\r
    0x0,            // limit 19:16, flags\r
    0x0,            // base 31:24\r
  },\r
  //\r
  // LINEAR_SEL\r
  //\r
  {\r
    0x0FFFF,        // limit 0xFFFFF\r
    0x0,            // base 0\r
    0x0,\r
    0x092,          // present, ring 0, data, expand-up, writable\r
    0x0CF,          // page-granular, 32-bit\r
    0x0,\r
  },\r
  //\r
  // LINEAR_CODE_SEL\r
  //\r
  {\r
    0x0FFFF,        // limit 0xFFFFF\r
    0x0,            // base 0\r
    0x0,\r
    0x09A,          // present, ring 0, data, expand-up, writable\r
    0x0CF,          // page-granular, 32-bit\r
    0x0,\r
  },\r
  //\r
  // SYS_DATA_SEL\r
  //\r
  {\r
    0x0FFFF,        // limit 0xFFFFF\r
    0x0,            // base 0\r
    0x0,\r
    0x092,          // present, ring 0, data, expand-up, writable\r
    0x0CF,          // page-granular, 32-bit\r
    0x0,\r
  },\r
  //\r
  // SYS_CODE_SEL\r
  //\r
  {\r
    0x0FFFF,        // limit 0xFFFFF\r
    0x0,            // base 0\r
    0x0,\r
    0x09A,          // present, ring 0, data, expand-up, writable\r
    0x0CF,          // page-granular, 32-bit\r
    0x0,\r
  },\r
  //\r
  // LINEAR_CODE64_SEL\r
  //\r
  {\r
    0x0FFFF,        // limit 0xFFFFF\r
    0x0,            // base 0\r
    0x0,\r
    0x09B,          // present, ring 0, code, expand-up, writable\r
    0x0AF,          // LimitHigh (CS.L=1, CS.D=0)\r
    0x0,            // base (high)\r
  },\r
  //\r
  // SPARE4_SEL\r
  //\r
  {\r
    0x0,            // limit 0\r
    0x0,            // base 0\r
    0x0,\r
    0x0,            // present, ring 0, data, expand-up, writable\r
    0x0,            // page-granular, 32-bit\r
    0x0,\r
  },\r
  //\r
  // SPARE5_SEL\r
  //\r
  {\r
    0x0,            // limit 0\r
    0x0,            // base 0\r
    0x0,\r
    0x0,            // present, ring 0, data, expand-up, writable\r
    0x0,            // page-granular, 32-bit\r
    0x0,\r
  },\r
};\r
\r
/**\r
  Initialize Global Descriptor Table.\r
\r
**/\r
VOID\r
InitGlobalDescriptorTable (\r
  VOID\r
  )\r
{\r
  GDT_ENTRIES *gdt;\r
  IA32_DESCRIPTOR gdtPtr;\r
\r
  //\r
  // Allocate Runtime Data for the GDT\r
  //\r
  gdt = AllocateRuntimePool (sizeof (GdtTemplate) + 8);\r
  ASSERT (gdt != NULL);\r
  gdt = ALIGN_POINTER (gdt, 8);\r
\r
  //\r
  // Initialize all GDT entries\r
  //\r
  CopyMem (gdt, &GdtTemplate, sizeof (GdtTemplate));\r
\r
  //\r
  // Write GDT register\r
  //\r
  gdtPtr.Base = (UINT32)(UINTN)(VOID*) gdt;\r
  gdtPtr.Limit = (UINT16) (sizeof (GdtTemplate) - 1);\r
  AsmWriteGdtr (&gdtPtr);\r
\r
  //\r
  // Update selector (segment) registers base on new GDT\r
  //\r
  SetCodeSelector ((UINT16)CPU_CODE_SEL);\r
  SetDataSelectors ((UINT16)CPU_DATA_SEL);\r
}\r
\r