1 /** @file 2 PC/AT CMOS access routines 3 4 Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR> 5 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 #include "Cmos.h" 17 #include "Library/IoLib.h" 18 19 /** 20 Reads 8-bits of CMOS data. 21 22 Reads the 8-bits of CMOS data at the location specified by Index. 23 The 8-bit read value is returned. 24 25 @param Index The CMOS location to read. 26 27 @return The value read. 28 29 **/ 30 UINT8 31 EFIAPI CmosRead8(IN UINTN Index)32CmosRead8 ( 33 IN UINTN Index 34 ) 35 { 36 IoWrite8 (0x70, (UINT8) Index); 37 return IoRead8 (0x71); 38 } 39 40 41 /** 42 Writes 8-bits of CMOS data. 43 44 Writes 8-bits of CMOS data to the location specified by Index 45 with the value specified by Value and returns Value. 46 47 @param Index The CMOS location to write. 48 @param Value The value to write to CMOS. 49 50 @return The value written to CMOS. 51 52 **/ 53 UINT8 54 EFIAPI CmosWrite8(IN UINTN Index,IN UINT8 Value)55CmosWrite8 ( 56 IN UINTN Index, 57 IN UINT8 Value 58 ) 59 { 60 IoWrite8 (0x70, (UINT8) Index); 61 IoWrite8 (0x71, Value); 62 return Value; 63 } 64 65