audk/MdePkg/Library/BasePostCodeLibPort80/PostCode.c

/** @file
  Post Code Library instance that writes post code values to I/O port 0x80.

  Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials                          
  are licensed and made available under the terms and conditions of the BSD License         
  which accompanies this distribution.  The full text of the license may be found at        
  http://opensource.org/licenses/bsd-license.php.                                            

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             

**/

#include <Base.h>

#include <Library/PostCodeLib.h>
#include <Library/PcdLib.h>
#include <Library/IoLib.h>
#include <Library/DebugLib.h>

/**
  Sends an 32-bit value to a POST card.

  Sends the 32-bit value specified by Value to a POST card, and returns Value.  
  Some implementations of this library function may perform I/O operations 
  directly to a POST card device.  Other implementations may send Value to 
  ReportStatusCode(), and the status code reporting mechanism will eventually 
  display the 32-bit value on the status reporting device.
  
  PostCode() must actively prevent recursion.  If PostCode() is called while 
  processing another any other Post Code Library function, then 
  PostCode() must return Value immediately.

  @param  Value  The 32-bit value to write to the POST card.

  @return The 32-bit value to write to the POST card.

**/
UINT32
EFIAPI
PostCode (
  IN UINT32  Value
  )
{
  switch (PcdGet8 (PcdPort80DataWidth)) {
  case 8:
    IoWrite8 (0x80, (UINT8)(Value));
    break;
  case 16:
    IoWrite16 (0x80, (UINT16)(Value));
    break;
  case 32:
    IoWrite32 (0x80, Value);
    break;
  default:
    //
    // Assert on the invalid data width
    //
    ASSERT (FALSE);
    break;
  }
  
  return Value;
}


/**
  Sends an 32-bit value to a POST and associated ASCII string.

  Sends the 32-bit value specified by Value to a POST card, and returns Value.
  If Description is not NULL, then the ASCII string specified by Description is 
  also passed to the handler that displays the POST card value.  Some 
  implementations of this library function may perform I/O operations directly 
  to a POST card device.  Other implementations may send Value to ReportStatusCode(), 
  and the status code reporting mechanism will eventually display the 32-bit 
  value on the status reporting device.  

  PostCodeWithDescription()must actively prevent recursion.  If 
  PostCodeWithDescription() is called while processing another any other Post 
  Code Library function, then PostCodeWithDescription() must return Value 
  immediately.

  @param  Value        The 32-bit value to write to the POST card.
  @param  Description  The pointer to an ASCII string that is a description of the 
                       POST code value.  This is an optional parameter that may 
                       be NULL.

  @return The 32-bit value to write to the POST card.

**/
UINT32
EFIAPI
PostCodeWithDescription (
  IN UINT32       Value,
  IN CONST CHAR8  *Description  OPTIONAL
  )
{
  PostCode (Value);
  return Value;
}


/**
  Returns TRUE if POST Codes are enabled.

  This function returns TRUE if the POST_CODE_PROPERTY_POST_CODE_ENABLED 
  bit of PcdPostCodePropertyMask is set.  Otherwise FALSE is returned.

  @retval  TRUE   The POST_CODE_PROPERTY_POST_CODE_ENABLED bit of 
                  PcdPostCodeProperyMask is set.
  @retval  FALSE  The POST_CODE_PROPERTY_POST_CODE_ENABLED bit of 
                  PcdPostCodeProperyMask is clear.

**/
BOOLEAN
EFIAPI
PostCodeEnabled (
  VOID
  )
{
  return (BOOLEAN) ((PcdGet8(PcdPostCodePropertyMask) & POST_CODE_PROPERTY_POST_CODE_ENABLED) != 0);
}


/**
  Returns TRUE if POST code descriptions are enabled.

  This function returns TRUE if the POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED
  bit of PcdPostCodePropertyMask is set.  Otherwise FALSE is returned.

  @retval  TRUE   The POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED bit of
                  PcdPostCodeProperyMask is set.
  @retval  FALSE  The POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED bit of
                  PcdPostCodeProperyMask is clear.

**/
BOOLEAN
EFIAPI
PostCodeDescriptionEnabled (
  VOID
  )
{
  return (BOOLEAN) ((PcdGet8(PcdPostCodePropertyMask) & POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED) != 0);
}