MdePkg/Library/BasePostCodeLibPort80/PostCode.c

   1 /** @file
   2   Post Code Library instance that writes post code values to I/O port 0x80.
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15
  16
  17 #include <Base.h>
  18
  19
  20 #include <Library/PostCodeLib.h>
  21 #include <Library/PcdLib.h>
  22 #include <Library/IoLib.h>
  23
  24 /**
  25   Sends an 32-bit value to a POST card.
  26
  27   Sends the 32-bit value specified by Value to a POST card, and returns Value.
  28   Some implementations of this library function may perform I/O operations
  29   directly to a POST card device.  Other implementations may send Value to
  30   ReportStatusCode(), and the status code reporting mechanism will eventually
  31   display the 32-bit value on the status reporting device.
  32
  33   PostCode() must actively prevent recursion.  If PostCode() is called while
  34   processing another any other Post Code Library function, then
  35   PostCode() must return Value immediately.
  36
  37   @param  Value  The 32-bit value to write to the POST card.
  38
  39   @return  Value The 32-bit value to write to the POST card.
  40
  41 **/
  42 UINT32
  43 EFIAPI
  44 PostCode (
  45   IN UINT32  Value
  46   )
  47 {
  48   IoWrite8 (0x80, (UINT8)(Value));
  49   return Value;
  50 }
  51
  52
  53 /**
  54   Sends an 32-bit value to a POST and associated ASCII string.
  55
  56   Sends the 32-bit value specified by Value to a POST card, and returns Value.
  57   If Description is not NULL, then the ASCII string specified by Description is
  58   also passed to the handler that displays the POST card value.  Some
  59   implementations of this library function may perform I/O operations directly
  60   to a POST card device.  Other implementations may send Value to ReportStatusCode(),
  61   and the status code reporting mechanism will eventually display the 32-bit
  62   value on the status reporting device.
  63
  64   PostCodeWithDescription()must actively prevent recursion.  If
  65   PostCodeWithDescription() is called while processing another any other Post
  66   Code Library function, then PostCodeWithDescription() must return Value
  67   immediately.
  68
  69   @param  Value        The 32-bit value to write to the POST card.
  70   @param  Description  Pointer to an ASCII string that is a description of the
  71                        POST code value.  This is an optional parameter that may
  72                        be NULL. Ihis parameter is ignored in this implementation.
  73
  74   @return  Value       The 32-bit value to write to the POST card.
  75
  76 **/
  77 UINT32
  78 EFIAPI
  79 PostCodeWithDescription (
  80   IN UINT32       Value,
  81   IN CONST CHAR8  *Description  OPTIONAL
  82   )
  83 {
  84   IoWrite8 (0x80, (UINT8)(Value));
  85   return Value;
  86 }
  87
  88
  89 /**
  90   Returns TRUE if POST Codes are enabled.
  91
  92   This function returns TRUE if the POST_CODE_PROPERTY_POST_CODE_ENABLED
  93   bit of PcdPostCodePropertyMask is set.  Otherwise FALSE is returned.
  94
  95   @retval  TRUE   The POST_CODE_PROPERTY_POST_CODE_ENABLED bit of
  96                   PcdPostCodeProperyMask is set.
  97   @retval  FALSE  The POST_CODE_PROPERTY_POST_CODE_ENABLED bit of
  98                   PcdPostCodeProperyMask is clear.
  99
 100 **/
 101 BOOLEAN
 102 EFIAPI
 103 PostCodeEnabled (
 104   VOID
 105   )
 106 {
 107   return (BOOLEAN) ((PcdGet8(PcdPostCodePropertyMask) & POST_CODE_PROPERTY_POST_CODE_ENABLED) != 0);
 108 }
 109
 110
 111 /**
 112   Returns TRUE if POST code descriptions are enabled.
 113
 114   This function returns TRUE if the POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED
 115   bit of PcdPostCodePropertyMask is set.  Otherwise FALSE is returned.
 116
 117   @retval  TRUE   The POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED bit of
 118                   PcdPostCodeProperyMask is set.
 119   @retval  FALSE  The POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED bit of
 120                   PcdPostCodeProperyMask is clear.
 121
 122 **/
 123 BOOLEAN
 124 EFIAPI
 125 PostCodeDescriptionEnabled (
 126   VOID
 127   )
 128 {
 129   return (BOOLEAN) ((PcdGet8(PcdPostCodePropertyMask) & POST_CODE_PROPERTY_POST_CODE_DESCRIPTION_ENABLED) != 0);
 130 }