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/** @file
Copyright (c) 2004 - 2014, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
Module Name:
ExI.c
Abstract:
ExI configuration based on setup option
--*/
#include "PlatformDxe.h"
#define PchLpcPciCfg32(Register) MmioRead32 (MmPciAddress (0, DEFAULT_PCI_BUS_NUMBER_PCH, PCI_DEVICE_NUMBER_PCH_LPC, 0, Register))
//
// Procedure: GetPmcBase
//
// Description: This function read content of B:D:F 0:31:0, offset 44h (for
// PmcBase)
//
// Input: None
//
// Output: 32 bit PmcBase
//
UINT32
GetPmcBase (
VOID
)
{
return (PchLpcPciCfg32 (R_PCH_LPC_PMC_BASE) & B_PCH_LPC_PMC_BASE_BAR);
}
/**
Configure ExI.
@param ImageHandle Pointer to the loaded image protocol for this driver
@param SystemTable Pointer to the EFI System Table
@retval EFI_SUCCESS The driver initializes correctly.
**/
VOID
InitExI (
)
{
EFI_STATUS Status;
SYSTEM_CONFIGURATION SystemConfiguration;
UINTN VarSize;
VarSize = sizeof(SYSTEM_CONFIGURATION);
Status = gRT->GetVariable(
L"Setup",
&gEfiNormalSetupGuid,
NULL,
&VarSize,
&SystemConfiguration
);
if (EFI_ERROR (Status) || VarSize != sizeof(SYSTEM_CONFIGURATION)) {
//The setup variable is corrupted
VarSize = sizeof(SYSTEM_CONFIGURATION);
Status = gRT->GetVariable(
L"SetupRecovery",
&gEfiNormalSetupGuid,
NULL,
&VarSize,
&SystemConfiguration
);
ASSERT_EFI_ERROR (Status);
}
if (SystemConfiguration.ExISupport == 1) {
MmioOr32 ((UINTN) (GetPmcBase() + R_PCH_PMC_MTPMC1), (UINT32) BIT0+BIT1+BIT2);
} else if (SystemConfiguration.ExISupport == 0) {
MmioAnd32 ((UINTN) (GetPmcBase() + R_PCH_PMC_MTPMC1), ~((UINT32) BIT0+BIT1+BIT2)); //clear bit 0,1,2
}
}
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