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/** @file
Main SEC phase code. Handles initial TDX Hob List Processing
Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/PciLib.h>
#include <Library/PrePiLib.h>
#include <Library/QemuFwCfgLib.h>
#include <IndustryStandard/Tdx.h>
#include <IndustryStandard/UefiTcgPlatform.h>
#include <Library/PlatformInitLib.h>
#include <OvmfPlatforms.h>
#include "PeilessStartupInternal.h"
/**
* Construct the HobList in SEC phase.
*
* @return EFI_SUCCESS Successfully construct the firmware hoblist.
* @return EFI_NOT_FOUND Cannot find a memory region to be the fw hoblist.
*/
EFI_STATUS
EFIAPI
ConstructSecHobList (
)
{
UINT32 LowMemorySize;
UINT32 LowMemoryStart;
EFI_HOB_HANDOFF_INFO_TABLE *HobList;
EFI_HOB_PLATFORM_INFO PlatformInfoHob;
ZeroMem (&PlatformInfoHob, sizeof (PlatformInfoHob));
PlatformInfoHob.HostBridgeDevId = PciRead16 (OVMF_HOSTBRIDGE_DID);
LowMemorySize = PlatformGetSystemMemorySizeBelow4gb (&PlatformInfoHob);
ASSERT (LowMemorySize != 0);
LowMemoryStart = FixedPcdGet32 (PcdOvmfDxeMemFvBase) + FixedPcdGet32 (PcdOvmfDxeMemFvSize);
LowMemorySize -= LowMemoryStart;
DEBUG ((DEBUG_INFO, "LowMemory Start and End: %x, %x\n", LowMemoryStart, LowMemoryStart + LowMemorySize));
HobList = HobConstructor (
(VOID *)(UINTN)LowMemoryStart,
LowMemorySize,
(VOID *)(UINTN)LowMemoryStart,
(VOID *)(UINTN)(LowMemoryStart + LowMemorySize)
);
SetHobList ((VOID *)(UINT64)HobList);
return EFI_SUCCESS;
}
/**
* This function is to find a memory region which is the largest one below 4GB.
* It will be used as the firmware hoblist.
*
* @param VmmHobList Vmm passed hoblist which constains the memory information.
* @return EFI_SUCCESS Successfully construct the firmware hoblist.
*/
EFI_STATUS
EFIAPI
ConstructFwHobList (
IN CONST VOID *VmmHobList
)
{
EFI_PEI_HOB_POINTERS Hob;
EFI_PHYSICAL_ADDRESS PhysicalEnd;
UINT64 ResourceLength;
EFI_PHYSICAL_ADDRESS LowMemoryStart;
UINT64 LowMemoryLength;
ASSERT (VmmHobList != NULL);
Hob.Raw = (UINT8 *)VmmHobList;
LowMemoryLength = 0;
LowMemoryStart = 0;
//
// Parse the HOB list until end of list or matching type is found.
//
while (!END_OF_HOB_LIST (Hob)) {
if (Hob.Header->HobType == EFI_HOB_TYPE_RESOURCE_DESCRIPTOR) {
if (Hob.ResourceDescriptor->ResourceType == EFI_RESOURCE_SYSTEM_MEMORY) {
PhysicalEnd = Hob.ResourceDescriptor->PhysicalStart + Hob.ResourceDescriptor->ResourceLength;
ResourceLength = Hob.ResourceDescriptor->ResourceLength;
if (PhysicalEnd <= BASE_4GB) {
if (ResourceLength > LowMemoryLength) {
LowMemoryStart = Hob.ResourceDescriptor->PhysicalStart;
LowMemoryLength = ResourceLength;
}
} else {
break;
}
}
}
Hob.Raw = GET_NEXT_HOB (Hob);
}
if (LowMemoryLength == 0) {
DEBUG ((DEBUG_ERROR, "Cannot find a memory region under 4GB for Fw hoblist.\n"));
return EFI_NOT_FOUND;
}
//
// HobLib doesn't like HobStart at address 0 so adjust is needed
//
if (LowMemoryStart == 0) {
LowMemoryStart += EFI_PAGE_SIZE;
LowMemoryLength -= EFI_PAGE_SIZE;
}
DEBUG ((DEBUG_INFO, "LowMemory Start and End: %x, %x\n", LowMemoryStart, LowMemoryStart + LowMemoryLength));
HobConstructor (
(VOID *)LowMemoryStart,
LowMemoryLength,
(VOID *)LowMemoryStart,
(VOID *)(LowMemoryStart + LowMemoryLength)
);
SetHobList ((VOID *)(UINT64)LowMemoryStart);
return EFI_SUCCESS;
}
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