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- /** @file
- Acpi Gnvs Init Library.
- Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include <Uefi.h>
- #include <Library/IoLib.h>
- #include <Library/PciLib.h>
- #include <Library/DebugLib.h>
- #include <Library/BaseMemoryLib.h>
- #include <Library/UefiBootServicesTableLib.h>
- #include <PchAccess.h>
- #include <Protocol/GlobalNvsArea.h>
- #include <Protocol/MpService.h>
- /**
- @brief
- Global NVS initialize.
- @param[in] GlobalNvs - Pointer of Global NVS area
- @retval EFI_SUCCESS - Allocate Global NVS completed.
- @retval EFI_OUT_OF_RESOURCES - Failed to allocate required page for GNVS.
- **/
- EFI_STATUS
- EFIAPI
- AcpiGnvsInit (
- IN OUT VOID **GlobalNvs
- )
- {
- UINTN Pages;
- EFI_PHYSICAL_ADDRESS Address;
- EFI_STATUS Status;
- EFI_GLOBAL_NVS_AREA_PROTOCOL *GNVS;
- EFI_MP_SERVICES_PROTOCOL *MpService;
- UINTN NumberOfCPUs;
- UINTN NumberOfEnabledCPUs;
- Pages = EFI_SIZE_TO_PAGES (sizeof (EFI_GLOBAL_NVS_AREA));
- Address = 0xffffffff; // allocate address below 4G.
- Status = gBS->AllocatePages (
- AllocateMaxAddress,
- EfiACPIMemoryNVS,
- Pages,
- &Address
- );
- ASSERT_EFI_ERROR (Status);
- if (EFI_ERROR(Status)) {
- return Status;
- }
- //
- // Locate the MP services protocol
- // Find the MP Protocol. This is an MP platform, so MP protocol must be there.
- //
- Status = gBS->LocateProtocol (
- &gEfiMpServiceProtocolGuid,
- NULL,
- (VOID **) &MpService
- );
- ASSERT_EFI_ERROR (Status);
- //
- // Determine the number of processors
- //
- MpService->GetNumberOfProcessors (
- MpService,
- &NumberOfCPUs,
- &NumberOfEnabledCPUs
- );
- *GlobalNvs = (VOID *) (UINTN) Address;
- SetMem (*GlobalNvs, sizeof (EFI_GLOBAL_NVS_AREA), 0);
- //
- // GNVS default value init here...
- //
- GNVS = (EFI_GLOBAL_NVS_AREA_PROTOCOL *) &Address;
- GNVS->Area->ThreadCount = (UINT8)NumberOfEnabledCPUs;
- //
- // Miscellaneous
- //
- GNVS->Area->PL1LimitCS = 0;
- GNVS->Area->PL1LimitCSValue = 4500;
- return EFI_SUCCESS;
- }
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