57bcfc3b06
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3863 There are 3 variants of PlatformPei in OvmfPkg: - OvmfPkg/PlatformPei - OvmfPkg/XenPlatformPei - OvmfPkg/Bhyve/PlatformPei/PlatformPei.inf These PlatformPeis can share many common codes, such as Cmos / Hob / Memory / Platform related functions. This commit (and its following several patches) are to create a PlatformInitLib which wraps the common code called in above PlatformPeis. In this initial version of PlatformInitLib, below Cmos related functions are introduced: - PlatformCmosRead8 - PlatformCmosWrite8 - PlatformDebugDumpCmos They correspond to the functions in OvmfPkg/PlatformPei: - CmosRead8 - CmosWrite8 - DebugDumpCmos Considering this PlatformInitLib will be used in SEC phase, global variables and dynamic PCDs are avoided. We use PlatformInfoHob to exchange information between functions. EFI_HOB_PLATFORM_INFO is the data struct which contains the platform information, such as HostBridgeDevId, BootMode, S3Supported, SmmSmramRequire, etc. After PlatformInitLib is created, OvmfPkg/PlatformPei is refactored with this library. Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Erdem Aktas <erdemaktas@google.com> Cc: James Bottomley <jejb@linux.ibm.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Min Xu <min.m.xu@intel.com>
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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