[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / GccInlinePriv.c

/** @file\r
  GCC inline implementation of BaseLib processor specific functions that use\r
  privlidged instructions.\r
\r
  Copyright (c) 2006 - 2020, Intel Corporation. All rights reserved.<BR>\r
  Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
\r
#include "BaseLibInternals.h"\r
\r
/**\r
  Enables CPU interrupts.\r
\r
  Enables CPU interrupts.\r
\r
**/\r
VOID\r
EFIAPI\r
EnableInterrupts (\r
  VOID\r
  )\r
{\r
  __asm__ __volatile__ ("sti"::: "memory");\r
}\r
\r
\r
/**\r
  Disables CPU interrupts.\r
\r
  Disables CPU interrupts.\r
\r
**/\r
VOID\r
EFIAPI\r
DisableInterrupts (\r
  VOID\r
  )\r
{\r
  __asm__ __volatile__ ("cli"::: "memory");\r
}\r
\r
/**\r
  Returns a 64-bit Machine Specific Register(MSR).\r
\r
  Reads and returns the 64-bit MSR specified by Index. No parameter checking is\r
  performed on Index, and some Index values may cause CPU exceptions. The\r
  caller must either guarantee that Index is valid, or the caller must set up\r
  exception handlers to catch the exceptions. This function is only available\r
  on IA-32 and X64.\r
\r
  @param  Index The 32-bit MSR index to read.\r
\r
  @return The value of the MSR identified by Index.\r
\r
**/\r
UINT64\r
EFIAPI\r
AsmReadMsr64 (\r
  IN      UINT32                    Index\r
  )\r
{\r
  UINT64 Data;\r
\r
  __asm__ __volatile__ (\r
    "rdmsr"\r
    : "=A" (Data)   // %0\r
    : "c"  (Index)  // %1\r
    );\r
\r
  return Data;\r
}\r
\r
/**\r
  Writes a 64-bit value to a Machine Specific Register(MSR), and returns the\r
  value.\r
\r
  Writes the 64-bit value specified by Value to the MSR specified by Index. The\r
  64-bit value written to the MSR is returned. No parameter checking is\r
  performed on Index or Value, and some of these may cause CPU exceptions. The\r
  caller must either guarantee that Index and Value are valid, or the caller\r
  must establish proper exception handlers. This function is only available on\r
  IA-32 and X64.\r
\r
  @param  Index The 32-bit MSR index to write.\r
  @param  Value The 64-bit value to write to the MSR.\r
\r
  @return Value\r
\r
**/\r
UINT64\r
EFIAPI\r
AsmWriteMsr64 (\r
  IN      UINT32                    Index,\r
  IN      UINT64                    Value\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "wrmsr"\r
    :\r
    : "c" (Index),\r
      "A" (Value)\r
    );\r
\r
  return Value;\r
}\r
\r
/**\r
  Reads the current value of the Control Register 0 (CR0).\r
\r
  Reads and returns the current value of CR0. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of the Control Register 0 (CR0).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadCr0 (\r
  VOID\r
  )\r
{\r
  UINTN   Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%cr0,%0"\r
    : "=a" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of the Control Register 2 (CR2).\r
\r
  Reads and returns the current value of CR2. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of the Control Register 2 (CR2).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadCr2 (\r
  VOID\r
  )\r
{\r
  UINTN Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%cr2, %0"\r
    : "=r" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
/**\r
  Reads the current value of the Control Register 3 (CR3).\r
\r
  Reads and returns the current value of CR3. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of the Control Register 3 (CR3).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadCr3 (\r
  VOID\r
  )\r
{\r
  UINTN Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%cr3, %0"\r
    : "=r" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of the Control Register 4 (CR4).\r
\r
  Reads and returns the current value of CR4. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of the Control Register 4 (CR4).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadCr4 (\r
  VOID\r
  )\r
{\r
  UINTN Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%cr4, %0"\r
    : "=a" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Writes a value to Control Register 0 (CR0).\r
\r
  Writes and returns a new value to CR0. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Cr0 The value to write to CR0.\r
\r
  @return The value written to CR0.\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteCr0 (\r
  UINTN  Cr0\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%cr0"\r
    :\r
    : "r" (Cr0)\r
    );\r
  return Cr0;\r
}\r
\r
\r
/**\r
  Writes a value to Control Register 2 (CR2).\r
\r
  Writes and returns a new value to CR2. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Cr2 The value to write to CR2.\r
\r
  @return The value written to CR2.\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteCr2 (\r
  UINTN  Cr2\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%cr2"\r
    :\r
    : "r" (Cr2)\r
    );\r
  return Cr2;\r
}\r
\r
\r
/**\r
  Writes a value to Control Register 3 (CR3).\r
\r
  Writes and returns a new value to CR3. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Cr3 The value to write to CR3.\r
\r
  @return The value written to CR3.\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteCr3 (\r
  UINTN  Cr3\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%cr3"\r
    :\r
    : "r" (Cr3)\r
    );\r
  return Cr3;\r
}\r
\r
\r
/**\r
  Writes a value to Control Register 4 (CR4).\r
\r
  Writes and returns a new value to CR4. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Cr4 The value to write to CR4.\r
\r
  @return The value written to CR4.\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteCr4 (\r
  UINTN  Cr4\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%cr4"\r
    :\r
    : "r" (Cr4)\r
    );\r
  return Cr4;\r
}\r
\r
\r
/**\r
  Reads the current value of Debug Register 0 (DR0).\r
\r
  Reads and returns the current value of DR0. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of Debug Register 0 (DR0).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadDr0 (\r
  VOID\r
  )\r
{\r
  UINTN Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%dr0, %0"\r
    : "=r" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of Debug Register 1 (DR1).\r
\r
  Reads and returns the current value of DR1. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of Debug Register 1 (DR1).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadDr1 (\r
  VOID\r
  )\r
{\r
  UINTN Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%dr1, %0"\r
    : "=r" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of Debug Register 2 (DR2).\r
\r
  Reads and returns the current value of DR2. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of Debug Register 2 (DR2).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadDr2 (\r
  VOID\r
  )\r
{\r
  UINTN Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%dr2, %0"\r
    : "=r" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of Debug Register 3 (DR3).\r
\r
  Reads and returns the current value of DR3. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of Debug Register 3 (DR3).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadDr3 (\r
  VOID\r
  )\r
{\r
  UINTN Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%dr3, %0"\r
    : "=r" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of Debug Register 4 (DR4).\r
\r
  Reads and returns the current value of DR4. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of Debug Register 4 (DR4).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadDr4 (\r
  VOID\r
  )\r
{\r
  UINTN Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%dr4, %0"\r
    : "=r" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of Debug Register 5 (DR5).\r
\r
  Reads and returns the current value of DR5. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of Debug Register 5 (DR5).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadDr5 (\r
  VOID\r
  )\r
{\r
  UINTN Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%dr5, %0"\r
    : "=r" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of Debug Register 6 (DR6).\r
\r
  Reads and returns the current value of DR6. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of Debug Register 6 (DR6).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadDr6 (\r
  VOID\r
  )\r
{\r
  UINTN Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%dr6, %0"\r
    : "=r" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of Debug Register 7 (DR7).\r
\r
  Reads and returns the current value of DR7. This function is only available\r
  on IA-32 and X64. This returns a 32-bit value on IA-32 and a 64-bit value on\r
  X64.\r
\r
  @return The value of Debug Register 7 (DR7).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmReadDr7 (\r
  VOID\r
  )\r
{\r
  UINTN Data;\r
\r
  __asm__ __volatile__ (\r
    "movl %%dr7, %0"\r
    : "=r" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Writes a value to Debug Register 0 (DR0).\r
\r
  Writes and returns a new value to DR0. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Dr0 The value to write to Dr0.\r
\r
  @return The value written to Debug Register 0 (DR0).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteDr0 (\r
  UINTN  Dr0\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%dr0"\r
    :\r
    : "r" (Dr0)\r
    );\r
  return Dr0;\r
}\r
\r
\r
/**\r
  Writes a value to Debug Register 1 (DR1).\r
\r
  Writes and returns a new value to DR1. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Dr1 The value to write to Dr1.\r
\r
  @return The value written to Debug Register 1 (DR1).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteDr1 (\r
  UINTN  Dr1\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%dr1"\r
    :\r
    : "r" (Dr1)\r
    );\r
  return Dr1;\r
}\r
\r
\r
/**\r
  Writes a value to Debug Register 2 (DR2).\r
\r
  Writes and returns a new value to DR2. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Dr2 The value to write to Dr2.\r
\r
  @return The value written to Debug Register 2 (DR2).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteDr2 (\r
  UINTN  Dr2\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%dr2"\r
    :\r
    : "r" (Dr2)\r
    );\r
  return Dr2;\r
}\r
\r
\r
/**\r
  Writes a value to Debug Register 3 (DR3).\r
\r
  Writes and returns a new value to DR3. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Dr3 The value to write to Dr3.\r
\r
  @return The value written to Debug Register 3 (DR3).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteDr3 (\r
  UINTN  Dr3\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%dr3"\r
    :\r
    : "r" (Dr3)\r
    );\r
  return Dr3;\r
}\r
\r
\r
/**\r
  Writes a value to Debug Register 4 (DR4).\r
\r
  Writes and returns a new value to DR4. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Dr4 The value to write to Dr4.\r
\r
  @return The value written to Debug Register 4 (DR4).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteDr4 (\r
  UINTN  Dr4\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%dr4"\r
    :\r
    : "r" (Dr4)\r
    );\r
  return Dr4;\r
}\r
\r
\r
/**\r
  Writes a value to Debug Register 5 (DR5).\r
\r
  Writes and returns a new value to DR5. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Dr5 The value to write to Dr5.\r
\r
  @return The value written to Debug Register 5 (DR5).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteDr5 (\r
  UINTN  Dr5\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%dr5"\r
    :\r
    : "r" (Dr5)\r
    );\r
  return Dr5;\r
}\r
\r
\r
/**\r
  Writes a value to Debug Register 6 (DR6).\r
\r
  Writes and returns a new value to DR6. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Dr6 The value to write to Dr6.\r
\r
  @return The value written to Debug Register 6 (DR6).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteDr6 (\r
  UINTN  Dr6\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%dr6"\r
    :\r
    : "r" (Dr6)\r
    );\r
  return Dr6;\r
}\r
\r
\r
/**\r
  Writes a value to Debug Register 7 (DR7).\r
\r
  Writes and returns a new value to DR7. This function is only available on\r
  IA-32 and X64. This writes a 32-bit value on IA-32 and a 64-bit value on X64.\r
\r
  @param  Dr7 The value to write to Dr7.\r
\r
  @return The value written to Debug Register 7 (DR7).\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmWriteDr7 (\r
  UINTN  Dr7\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "movl %0, %%dr7"\r
    :\r
    : "r" (Dr7)\r
    );\r
  return Dr7;\r
}\r
\r
\r
/**\r
  Reads the current value of Code Segment Register (CS).\r
\r
  Reads and returns the current value of CS. This function is only available on\r
  IA-32 and X64.\r
\r
  @return The current value of CS.\r
\r
**/\r
UINT16\r
EFIAPI\r
AsmReadCs (\r
  VOID\r
  )\r
{\r
  UINT16  Data;\r
\r
  __asm__ __volatile__ (\r
    "mov   %%cs, %0"\r
    :"=a" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of Data Segment Register (DS).\r
\r
  Reads and returns the current value of DS. This function is only available on\r
  IA-32 and X64.\r
\r
  @return The current value of DS.\r
\r
**/\r
UINT16\r
EFIAPI\r
AsmReadDs (\r
  VOID\r
  )\r
{\r
  UINT16  Data;\r
\r
  __asm__ __volatile__ (\r
    "mov  %%ds, %0"\r
    :"=a" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of Extra Segment Register (ES).\r
\r
  Reads and returns the current value of ES. This function is only available on\r
  IA-32 and X64.\r
\r
  @return The current value of ES.\r
\r
**/\r
UINT16\r
EFIAPI\r
AsmReadEs (\r
  VOID\r
  )\r
{\r
  UINT16  Data;\r
\r
  __asm__ __volatile__ (\r
    "mov  %%es, %0"\r
    :"=a" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of FS Data Segment Register (FS).\r
\r
  Reads and returns the current value of FS. This function is only available on\r
  IA-32 and X64.\r
\r
  @return The current value of FS.\r
\r
**/\r
UINT16\r
EFIAPI\r
AsmReadFs (\r
  VOID\r
  )\r
{\r
  UINT16  Data;\r
\r
  __asm__ __volatile__ (\r
    "mov  %%fs, %0"\r
    :"=a" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of GS Data Segment Register (GS).\r
\r
  Reads and returns the current value of GS. This function is only available on\r
  IA-32 and X64.\r
\r
  @return The current value of GS.\r
\r
**/\r
UINT16\r
EFIAPI\r
AsmReadGs (\r
  VOID\r
  )\r
{\r
  UINT16  Data;\r
\r
  __asm__ __volatile__ (\r
    "mov  %%gs, %0"\r
    :"=a" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of Stack Segment Register (SS).\r
\r
  Reads and returns the current value of SS. This function is only available on\r
  IA-32 and X64.\r
\r
  @return The current value of SS.\r
\r
**/\r
UINT16\r
EFIAPI\r
AsmReadSs (\r
  VOID\r
  )\r
{\r
  UINT16  Data;\r
\r
  __asm__ __volatile__ (\r
    "mov  %%ds, %0"\r
    :"=a" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current value of Task Register (TR).\r
\r
  Reads and returns the current value of TR. This function is only available on\r
  IA-32 and X64.\r
\r
  @return The current value of TR.\r
\r
**/\r
UINT16\r
EFIAPI\r
AsmReadTr (\r
  VOID\r
  )\r
{\r
  UINT16  Data;\r
\r
  __asm__ __volatile__ (\r
    "str  %0"\r
    : "=a" (Data)\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Reads the current Global Descriptor Table Register(GDTR) descriptor.\r
\r
  Reads and returns the current GDTR descriptor and returns it in Gdtr. This\r
  function is only available on IA-32 and X64.\r
\r
  @param  Gdtr  The pointer to a GDTR descriptor.\r
\r
**/\r
VOID\r
EFIAPI\r
InternalX86ReadGdtr (\r
  OUT     IA32_DESCRIPTOR           *Gdtr\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "sgdt %0"\r
    : "=m" (*Gdtr)\r
    );\r
}\r
\r
\r
/**\r
  Writes the current Global Descriptor Table Register (GDTR) descriptor.\r
\r
  Writes and the current GDTR descriptor specified by Gdtr. This function is\r
  only available on IA-32 and X64.\r
\r
  @param  Gdtr  The pointer to a GDTR descriptor.\r
\r
**/\r
VOID\r
EFIAPI\r
InternalX86WriteGdtr (\r
  IN      CONST IA32_DESCRIPTOR     *Gdtr\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "lgdt %0"\r
    :\r
    : "m" (*Gdtr)\r
    );\r
\r
}\r
\r
\r
/**\r
  Reads the current Interrupt Descriptor Table Register(GDTR) descriptor.\r
\r
  Reads and returns the current IDTR descriptor and returns it in Idtr. This\r
  function is only available on IA-32 and X64.\r
\r
  @param  Idtr  The pointer to a IDTR descriptor.\r
\r
**/\r
VOID\r
EFIAPI\r
InternalX86ReadIdtr (\r
  OUT     IA32_DESCRIPTOR           *Idtr\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "sidt  %0"\r
    : "=m" (*Idtr)\r
    );\r
}\r
\r
\r
/**\r
  Writes the current Interrupt Descriptor Table Register(GDTR) descriptor.\r
\r
  Writes the current IDTR descriptor and returns it in Idtr. This function is\r
  only available on IA-32 and X64.\r
\r
  @param  Idtr  The pointer to a IDTR descriptor.\r
\r
**/\r
VOID\r
EFIAPI\r
InternalX86WriteIdtr (\r
  IN      CONST IA32_DESCRIPTOR     *Idtr\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "lidt %0"\r
    :\r
    : "m" (*Idtr)\r
    );\r
}\r
\r
\r
/**\r
  Reads the current Local Descriptor Table Register(LDTR) selector.\r
\r
  Reads and returns the current 16-bit LDTR descriptor value. This function is\r
  only available on IA-32 and X64.\r
\r
  @return The current selector of LDT.\r
\r
**/\r
UINT16\r
EFIAPI\r
AsmReadLdtr (\r
  VOID\r
  )\r
{\r
  UINT16  Data;\r
\r
  __asm__ __volatile__ (\r
    "sldt  %0"\r
    : "=g" (Data)   // %0\r
    );\r
\r
  return Data;\r
}\r
\r
\r
/**\r
  Writes the current Local Descriptor Table Register (GDTR) selector.\r
\r
  Writes and the current LDTR descriptor specified by Ldtr. This function is\r
  only available on IA-32 and X64.\r
\r
  @param  Ldtr  16-bit LDTR selector value.\r
\r
**/\r
VOID\r
EFIAPI\r
AsmWriteLdtr (\r
  IN      UINT16                    Ldtr\r
  )\r
{\r
  __asm__ __volatile__ (\r
    "lldtw  %0"\r
    :\r
    : "g" (Ldtr)   // %0\r
    );\r
}\r
\r
/**\r
  Reads the current value of a Performance Counter (PMC).\r
\r
  Reads and returns the current value of performance counter specified by\r
  Index. This function is only available on IA-32 and X64.\r
\r
  @param  Index The 32-bit Performance Counter index to read.\r
\r
  @return The value of the PMC specified by Index.\r
\r
**/\r
UINT64\r
EFIAPI\r
AsmReadPmc (\r
  IN      UINT32                    Index\r
  )\r
{\r
  UINT64  Data;\r
\r
  __asm__ __volatile__ (\r
    "rdpmc"\r
    : "=A" (Data)\r
    : "c"  (Index)\r
    );\r
\r
  return Data;\r
}\r
\r
/**\r
  Executes a WBINVD instruction.\r
\r
  Executes a WBINVD instruction. This function is only available on IA-32 and\r
  X64.\r
\r
**/\r
VOID\r
EFIAPI\r
AsmWbinvd (\r
  VOID\r
  )\r
{\r
  __asm__ __volatile__ ("wbinvd":::"memory");\r
}\r
\r
/**\r
  Executes a INVD instruction.\r
\r
  Executes a INVD instruction. This function is only available on IA-32 and\r
  X64.\r
\r
**/\r
VOID\r
EFIAPI\r
AsmInvd (\r
  VOID\r
  )\r
{\r
  __asm__ __volatile__ ("invd":::"memory");\r
\r
}\r
\r
\r
/**\r
  Flushes a cache line from all the instruction and data caches within the\r
  coherency domain of the CPU.\r
\r
  Flushed the cache line specified by LinearAddress, and returns LinearAddress.\r
  This function is only available on IA-32 and X64.\r
\r
  @param  LinearAddress The address of the cache line to flush. If the CPU is\r
                        in a physical addressing mode, then LinearAddress is a\r
                        physical address. If the CPU is in a virtual\r
                        addressing mode, then LinearAddress is a virtual\r
                        address.\r
\r
  @return LinearAddress\r
**/\r
VOID *\r
EFIAPI\r
AsmFlushCacheLine (\r
  IN      VOID                      *LinearAddress\r
  )\r
{\r
  UINT32  RegEdx;\r
\r
  //\r
  // If the CPU does not support CLFLUSH instruction,\r
  // then promote flush range to flush entire cache.\r
  //\r
  AsmCpuid (0x01, NULL, NULL, NULL, &RegEdx);\r
  if ((RegEdx & BIT19) == 0) {\r
    __asm__ __volatile__ ("wbinvd":::"memory");\r
    return LinearAddress;\r
  }\r
\r
\r
  __asm__ __volatile__ (\r
    "clflush (%0)"\r
    : "+a" (LinearAddress)\r
    :\r
    : "memory"\r
    );\r
\r
  return LinearAddress;\r
}\r