/** @file
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Acpi Gnvs Init Library.
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Copyright (c) 2020, 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 <Uefi.h>
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#include <Library/IoLib.h>
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#include <Library/PciLib.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <PchAccess.h>
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#include <Protocol/GlobalNvsArea.h>
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#include <Protocol/MpService.h>
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/**
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@brief
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Global NVS initialize.
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@param[in] GlobalNvs - Pointer of Global NVS area
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@retval EFI_SUCCESS - Allocate Global NVS completed.
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@retval EFI_OUT_OF_RESOURCES - Failed to allocate required page for GNVS.
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**/
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EFI_STATUS
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EFIAPI
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AcpiGnvsInit (
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IN OUT VOID **GlobalNvs
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)
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{
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UINTN Pages;
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EFI_PHYSICAL_ADDRESS Address;
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EFI_STATUS Status;
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EFI_GLOBAL_NVS_AREA_PROTOCOL *GNVS;
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EFI_MP_SERVICES_PROTOCOL *MpService;
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UINTN NumberOfCPUs;
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UINTN NumberOfEnabledCPUs;
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Pages = EFI_SIZE_TO_PAGES (sizeof (EFI_GLOBAL_NVS_AREA));
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Address = 0xffffffff; // allocate address below 4G.
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Status = gBS->AllocatePages (
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AllocateMaxAddress,
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EfiACPIMemoryNVS,
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Pages,
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&Address
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);
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ASSERT_EFI_ERROR (Status);
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if (EFI_ERROR(Status)) {
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return Status;
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}
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//
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// Locate the MP services protocol
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// Find the MP Protocol. This is an MP platform, so MP protocol must be there.
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//
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Status = gBS->LocateProtocol (
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&gEfiMpServiceProtocolGuid,
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NULL,
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(VOID **) &MpService
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);
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ASSERT_EFI_ERROR (Status);
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//
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// Determine the number of processors
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//
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MpService->GetNumberOfProcessors (
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MpService,
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&NumberOfCPUs,
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&NumberOfEnabledCPUs
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);
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*GlobalNvs = (VOID *) (UINTN) Address;
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SetMem (*GlobalNvs, sizeof (EFI_GLOBAL_NVS_AREA), 0);
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//
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// GNVS default value init here...
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//
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GNVS = (EFI_GLOBAL_NVS_AREA_PROTOCOL *) &Address;
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GNVS->Area->ThreadCount = (UINT8)NumberOfEnabledCPUs;
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//
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// Miscellaneous
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//
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GNVS->Area->PL1LimitCS = 0;
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GNVS->Area->PL1LimitCSValue = 4500;
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return EFI_SUCCESS;
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}
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