mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
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145 lines
3.1 KiB
C
145 lines
3.1 KiB
C
/** @file
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OcRtcLib - library with RTC I/O functions
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Copyright (c) 2017-2018, vit9696
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All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <IndustryStandard/AppleRtc.h>
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#include <Library/IoLib.h>
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#include <Library/OcRtcLib.h>
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#include "OcRtcLibInternal.h"
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UINT8
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OcRtcRead (
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IN UINT8 Offset
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)
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{
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UINT8 RtcIndexPort;
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UINT8 RtcDataPort;
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UINT8 RtcIndexNmi;
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if (Offset < RTC_BANK_SIZE) {
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RtcIndexPort = R_PCH_RTC_INDEX;
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RtcDataPort = R_PCH_RTC_TARGET;
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} else {
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RtcIndexPort = R_PCH_RTC_EXT_INDEX;
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RtcDataPort = R_PCH_RTC_EXT_TARGET;
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}
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RtcIndexNmi = IoRead8 (RtcIndexPort) & RTC_NMI_MASK;
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IoWrite8 (RtcIndexPort, (Offset & RTC_DATA_MASK) | RtcIndexNmi);
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return IoRead8 (RtcDataPort);
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}
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VOID
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OcRtcWrite (
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IN UINT8 Offset,
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IN UINT8 Value
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)
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{
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UINT8 RtcIndexPort;
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UINT8 RtcDataPort;
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UINT8 RtcIndexNmi;
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if (Offset < RTC_BANK_SIZE) {
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RtcIndexPort = R_PCH_RTC_INDEX;
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RtcDataPort = R_PCH_RTC_TARGET;
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} else {
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RtcIndexPort = R_PCH_RTC_EXT_INDEX;
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RtcDataPort = R_PCH_RTC_EXT_TARGET;
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}
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RtcIndexNmi = IoRead8 (RtcIndexPort) & RTC_NMI_MASK;
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IoWrite8 (RtcIndexPort, (Offset & RTC_DATA_MASK) | RtcIndexNmi);
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IoWrite8 (RtcDataPort, Value);
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}
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UINT16
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OcRtcChecksumApple (
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IN CONST VOID *Data,
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IN UINTN Size
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)
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{
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CONST UINT8 *Buffer;
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CONST UINT8 *BufferEnd;
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UINT16 Checksum;
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UINTN Index;
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Buffer = Data;
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BufferEnd = Buffer + Size;
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Checksum = 0;
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while (Buffer < BufferEnd) {
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Checksum ^= *Buffer++;
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for (Index = 0; Index < APPLE_RTC_CHECKSUM_ROUNDS; ++Index) {
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if (Checksum & 1U) {
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Checksum >>= 1U;
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Checksum ^= APPLE_RTC_CHECKSUM_POLYNOMIAL;
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} else {
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Checksum >>= 1U;
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}
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}
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}
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return Checksum;
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}
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UINT8
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OcRtcReadIvy (
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IN UINT8 Offset
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)
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{
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UINT8 RtcIndexPort;
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UINT8 RtcDataPort;
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//
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// CMOS access registers (using alternative access not to handle NMI bit)
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//
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if (Offset < RTC_BANK_SIZE) {
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RtcIndexPort = R_PCH_RTC_INDEX_ALT;
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RtcDataPort = R_PCH_RTC_TARGET_ALT;
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} else {
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RtcIndexPort = R_PCH_RTC_EXT_INDEX_ALT;
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RtcDataPort = R_PCH_RTC_EXT_TARGET_ALT;
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}
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IoWrite8 (RtcIndexPort, Offset & RTC_DATA_MASK);
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return IoRead8 (RtcDataPort);
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}
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VOID
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OcRtcWriteIvy (
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IN UINT8 Offset,
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IN UINT8 Value
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)
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{
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UINT8 RtcIndexPort;
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UINT8 RtcDataPort;
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//
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// CMOS access registers (using alternative access not to handle NMI bit)
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//
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if (Offset < RTC_BANK_SIZE) {
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RtcIndexPort = R_PCH_RTC_INDEX_ALT;
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RtcDataPort = R_PCH_RTC_TARGET_ALT;
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} else {
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RtcIndexPort = R_PCH_RTC_EXT_INDEX_ALT;
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RtcDataPort = R_PCH_RTC_EXT_TARGET_ALT;
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}
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IoWrite8 (RtcIndexPort, Offset & RTC_DATA_MASK);
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IoWrite8 (RtcDataPort, Value);
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}
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