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82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
/** @file
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PC/AT CMOS access routines
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Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/PlatformInitLib.h>
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#include <Library/DebugLib.h>
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#include "Library/IoLib.h"
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/**
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Reads 8-bits of CMOS data.
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Reads the 8-bits of CMOS data at the location specified by Index.
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The 8-bit read value is returned.
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@param Index The CMOS location to read.
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@return The value read.
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**/
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UINT8
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EFIAPI
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PlatformCmosRead8 (
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IN UINTN Index
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)
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{
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IoWrite8 (0x70, (UINT8)Index);
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return IoRead8 (0x71);
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}
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/**
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Writes 8-bits of CMOS data.
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Writes 8-bits of CMOS data to the location specified by Index
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with the value specified by Value and returns Value.
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@param Index The CMOS location to write.
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@param Value The value to write to CMOS.
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@return The value written to CMOS.
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**/
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UINT8
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EFIAPI
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PlatformCmosWrite8 (
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IN UINTN Index,
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IN UINT8 Value
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)
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{
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IoWrite8 (0x70, (UINT8)Index);
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IoWrite8 (0x71, Value);
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return Value;
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}
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/**
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Dump the CMOS content
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*/
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VOID
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EFIAPI
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PlatformDebugDumpCmos (
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VOID
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)
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{
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UINT32 Loop;
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DEBUG ((DEBUG_INFO, "CMOS:\n"));
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for (Loop = 0; Loop < 0x80; Loop++) {
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if ((Loop % 0x10) == 0) {
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DEBUG ((DEBUG_INFO, "%02x:", Loop));
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}
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DEBUG ((DEBUG_INFO, " %02x", PlatformCmosRead8 (Loop)));
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if ((Loop % 0x10) == 0xf) {
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DEBUG ((DEBUG_INFO, "\n"));
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}
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}
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}
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