4fe2678411
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 PeilessStarupLib provides a function (PeilessStartup) which brings up both Legacy and Tdx guest from SEC phase to DXE phase. PEI phase is skipped so that the attack surfaces are reduced as much as possible. PeilessStartup() does below tasks: 1. Contruct the FW hoblist. Since PEI is skipped, we must find a memory region which is the largest one below 4GB. Then this memory region will be used as the firmware hoblist. 2. Initialize the platform. 3. Build various Hobs, such as SecFv Hob, DxeFv Hob, Stack Hob, etc. 4. At last DXE Core is located / loaded and transfer control to it. Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Erdem Aktas <erdemaktas@google.com> Cc: James Bottomley <jejb@linux.ibm.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Min Xu <min.m.xu@intel.com>
136 lines
4.0 KiB
C
136 lines
4.0 KiB
C
/** @file
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Main SEC phase code. Handles initial TDX Hob List Processing
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Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>
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(C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiPei.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/PciLib.h>
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#include <Library/PrePiLib.h>
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#include <Library/QemuFwCfgLib.h>
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#include <IndustryStandard/Tdx.h>
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#include <IndustryStandard/UefiTcgPlatform.h>
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#include <Library/PlatformInitLib.h>
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#include <OvmfPlatforms.h>
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#include "PeilessStartupInternal.h"
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/**
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* Construct the HobList in SEC phase.
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*
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* @return EFI_SUCCESS Successfully construct the firmware hoblist.
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* @return EFI_NOT_FOUND Cannot find a memory region to be the fw hoblist.
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*/
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EFI_STATUS
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EFIAPI
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ConstructSecHobList (
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)
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{
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UINT32 LowMemorySize;
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UINT32 LowMemoryStart;
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EFI_HOB_HANDOFF_INFO_TABLE *HobList;
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EFI_HOB_PLATFORM_INFO PlatformInfoHob;
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ZeroMem (&PlatformInfoHob, sizeof (PlatformInfoHob));
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PlatformInfoHob.HostBridgeDevId = PciRead16 (OVMF_HOSTBRIDGE_DID);
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LowMemorySize = PlatformGetSystemMemorySizeBelow4gb (&PlatformInfoHob);
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ASSERT (LowMemorySize != 0);
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LowMemoryStart = FixedPcdGet32 (PcdOvmfDxeMemFvBase) + FixedPcdGet32 (PcdOvmfDxeMemFvSize);
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LowMemorySize -= LowMemoryStart;
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DEBUG ((DEBUG_INFO, "LowMemory Start and End: %x, %x\n", LowMemoryStart, LowMemoryStart + LowMemorySize));
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HobList = HobConstructor (
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(VOID *)(UINTN)LowMemoryStart,
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LowMemorySize,
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(VOID *)(UINTN)LowMemoryStart,
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(VOID *)(UINTN)(LowMemoryStart + LowMemorySize)
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);
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SetHobList ((VOID *)(UINT64)HobList);
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return EFI_SUCCESS;
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}
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/**
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* This function is to find a memory region which is the largest one below 4GB.
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* It will be used as the firmware hoblist.
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*
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* @param VmmHobList Vmm passed hoblist which constains the memory information.
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* @return EFI_SUCCESS Successfully construct the firmware hoblist.
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*/
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EFI_STATUS
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EFIAPI
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ConstructFwHobList (
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IN CONST VOID *VmmHobList
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)
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{
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EFI_PEI_HOB_POINTERS Hob;
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EFI_PHYSICAL_ADDRESS PhysicalEnd;
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UINT64 ResourceLength;
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EFI_PHYSICAL_ADDRESS LowMemoryStart;
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UINT64 LowMemoryLength;
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ASSERT (VmmHobList != NULL);
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Hob.Raw = (UINT8 *)VmmHobList;
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LowMemoryLength = 0;
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LowMemoryStart = 0;
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//
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// Parse the HOB list until end of list or matching type is found.
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//
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while (!END_OF_HOB_LIST (Hob)) {
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if (Hob.Header->HobType == EFI_HOB_TYPE_RESOURCE_DESCRIPTOR) {
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if (Hob.ResourceDescriptor->ResourceType == EFI_RESOURCE_SYSTEM_MEMORY) {
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PhysicalEnd = Hob.ResourceDescriptor->PhysicalStart + Hob.ResourceDescriptor->ResourceLength;
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ResourceLength = Hob.ResourceDescriptor->ResourceLength;
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if (PhysicalEnd <= BASE_4GB) {
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if (ResourceLength > LowMemoryLength) {
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LowMemoryStart = Hob.ResourceDescriptor->PhysicalStart;
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LowMemoryLength = ResourceLength;
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}
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} else {
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break;
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}
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}
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}
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Hob.Raw = GET_NEXT_HOB (Hob);
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}
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if (LowMemoryLength == 0) {
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DEBUG ((DEBUG_ERROR, "Cannot find a memory region under 4GB for Fw hoblist.\n"));
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return EFI_NOT_FOUND;
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}
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//
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// HobLib doesn't like HobStart at address 0 so adjust is needed
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//
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if (LowMemoryStart == 0) {
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LowMemoryStart += EFI_PAGE_SIZE;
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LowMemoryLength -= EFI_PAGE_SIZE;
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}
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DEBUG ((DEBUG_INFO, "LowMemory Start and End: %x, %x\n", LowMemoryStart, LowMemoryStart + LowMemoryLength));
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HobConstructor (
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(VOID *)LowMemoryStart,
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LowMemoryLength,
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(VOID *)LowMemoryStart,
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(VOID *)(LowMemoryStart + LowMemoryLength)
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);
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SetHobList ((VOID *)(UINT64)LowMemoryStart);
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return EFI_SUCCESS;
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}
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