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/** @file
The library call to pass the device tree to DXE via HOB.
Copyright (c) 2021, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
//
//// The package level header files this module uses
////
#include <PiPei.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseRiscVSbiLib.h>
#include <Library/PcdLib.h>
#include <Include/Library/PrePiLib.h>
#include <libfdt.h>
#include <Guid/FdtHob.h>
/**
@retval EFI_SUCCESS The address of FDT is passed in HOB.
EFI_UNSUPPORTED Can't locate FDT.
**/
EFI_STATUS
EFIAPI
PlatformPeimInitialization (
VOID
)
{
EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext;
VOID *FdtPointer;
VOID *Base;
VOID *NewBase;
UINTN FdtSize;
UINTN FdtPages;
UINT64 *FdtHobData;
FirmwareContext = NULL;
GetFirmwareContextPointer (&FirmwareContext);
if (FirmwareContext == NULL) {
DEBUG ((DEBUG_ERROR, "%a: Firmware Context is NULL\n", __func__));
return EFI_UNSUPPORTED;
}
FdtPointer = (VOID *)FirmwareContext->FlattenedDeviceTree;
if (FdtPointer == NULL) {
DEBUG ((DEBUG_ERROR, "%a: Invalid FDT pointer\n", __func__));
return EFI_UNSUPPORTED;
}
DEBUG ((DEBUG_INFO, "%a: Build FDT HOB - FDT at address: 0x%x \n", __func__, FdtPointer));
Base = FdtPointer;
if (fdt_check_header (Base) != 0) {
DEBUG ((DEBUG_ERROR, "%a: Corrupted DTB\n", __func__));
return EFI_UNSUPPORTED;
}
FdtSize = fdt_totalsize (Base);
FdtPages = EFI_SIZE_TO_PAGES (FdtSize);
NewBase = AllocatePages (FdtPages);
if (NewBase == NULL) {
DEBUG ((DEBUG_ERROR, "%a: Could not allocate memory for DTB\n", __func__));
return EFI_UNSUPPORTED;
}
fdt_open_into (Base, NewBase, EFI_PAGES_TO_SIZE (FdtPages));
FdtHobData = BuildGuidHob (&gFdtHobGuid, sizeof *FdtHobData);
if (FdtHobData == NULL) {
DEBUG ((DEBUG_ERROR, "%a: Could not build FDT Hob\n", __func__));
return EFI_UNSUPPORTED;
}
*FdtHobData = (UINTN)NewBase;
BuildFvHob (PcdGet32 (PcdOvmfDxeMemFvBase), PcdGet32 (PcdOvmfDxeMemFvSize));
return EFI_SUCCESS;
}
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