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PcAtChipsetPkg/PcRtc: Add two new PCD for RTC Index/Target registers

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In certain HW implementation, the BIT7 of RTC Index register(0x70) is
for NMI sources enable/disable but the BIT7 of 0x70 cannot be read
before writing. Software which doesn't want to change the NMI sources
enable/disable setting can write to the alias register 0x74, through
which only BIT0 ~ BIT6 of 0x70 is modified.
So two new PCDs are added so that platform can have the flexibility
to change the default RTC register addresses from 0x70/0x71 to
0x74/0x75.
With the new PCDs added, it can also support special HW that provides
RTC storage in a different register pairs.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
This commit is contained in:
Ruiyu Ni
2018-05-25 16:29:48 +08:00
parent 5a57246eab
commit 36dd3c781e
5 changed files with 25 additions and 12 deletions
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8
PcAtChipsetPkg/PcAtChipsetPkg.uni
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@@ -4,7 +4,7 @@
// This package is designed to public interfaces and implementation which follows
// PcAt defacto standard.
//
// Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
// Copyright (c) 2009 - 2018, 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
@@ -165,3 +165,9 @@
#string STR_gPcAtChipsetPkgTokenSpaceGuid_PcdInitialValueRtcRegisterD_PROMPT #language en-US "Initial value for Register_D in RTC."
#string STR_gPcAtChipsetPkgTokenSpaceGuid_PcdInitialValueRtcRegisterD_HELP #language en-US "Specifies the initial value for Register_D in RTC."
#string STR_gPcAtChipsetPkgTokenSpaceGuid_PcdRtcIndexRegister_PROMPT #language en-US "RTC Index Register address"
#string STR_gPcAtChipsetPkgTokenSpaceGuid_PcdRtcIndexRegister_HELP #language en-US "Specifies RTC Index Register address in I/O space."
#string STR_gPcAtChipsetPkgTokenSpaceGuid_PcdRtcTargetRegister_PROMPT #language en-US "RTC Target Register address"
#string STR_gPcAtChipsetPkgTokenSpaceGuid_PcdRtcTargetRegister_HELP #language en-US "Specifies RTC Target Register address in I/O space."