MdePkg/BaseLib: Support IA32 processors without CLFLUSH

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

/** @file\r
  Implementation of SetJump() on IA-32.\r
\r
  Copyright (c) 2006 - 2008, 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
\r
#include "BaseLibInternals.h"\r
\r
/**\r
  Worker function that checks ASSERT condition for JumpBuffer\r
\r
  Checks ASSERT condition for JumpBuffer.\r
\r
  If JumpBuffer is NULL, then ASSERT().\r
  For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().\r
\r
  @param  JumpBuffer    A pointer to CPU context buffer.\r
\r
**/\r
VOID\r
EFIAPI\r
InternalAssertJumpBuffer (\r
  IN      BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer\r
  );\r
\r
/**\r
  Saves the current CPU context that can be restored with a call to LongJump()\r
  and returns 0.\r
\r
  Saves the current CPU context in the buffer specified by JumpBuffer and\r
  returns 0. The initial call to SetJump() must always return 0. Subsequent\r
  calls to LongJump() cause a non-zero value to be returned by SetJump().\r
\r
  If JumpBuffer is NULL, then ASSERT().\r
  For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().\r
\r
  @param  JumpBuffer  A pointer to CPU context buffer.\r
\r
  @retval 0 Indicates a return from SetJump().\r
\r
**/\r
_declspec (naked)\r
UINTN\r
EFIAPI\r
SetJump (\r
  OUT     BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer\r
  )\r
{\r
  _asm {\r
    push    [esp + 4]\r
    call    InternalAssertJumpBuffer\r
    pop     ecx\r
    pop     ecx\r
    mov     edx, [esp]\r
    mov     [edx], ebx\r
    mov     [edx + 4], esi\r
    mov     [edx + 8], edi\r
    mov     [edx + 12], ebp\r
    mov     [edx + 16], esp\r
    mov     [edx + 20], ecx\r
    xor     eax, eax\r
    jmp     ecx\r
  }\r
}\r
\r