diff options
Diffstat (limited to 'StandaloneMmPkg/Library/StandaloneMmMemLib/X86StandaloneMmMemLibInternal.c')
| -rw-r--r-- | StandaloneMmPkg/Library/StandaloneMmMemLib/X86StandaloneMmMemLibInternal.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/StandaloneMmPkg/Library/StandaloneMmMemLib/X86StandaloneMmMemLibInternal.c b/StandaloneMmPkg/Library/StandaloneMmMemLib/X86StandaloneMmMemLibInternal.c new file mode 100644 index 0000000000..1a97854171 --- /dev/null +++ b/StandaloneMmPkg/Library/StandaloneMmMemLib/X86StandaloneMmMemLibInternal.c @@ -0,0 +1,155 @@ +/** @file
+ Internal ARCH Specific file of MM memory check library.
+
+ MM memory check library implementation. This library consumes MM_ACCESS_PROTOCOL
+ to get MMRAM information. In order to use this library instance, the platform should produce
+ all MMRAM range via MM_ACCESS_PROTOCOL, including the range for firmware (like MM Core
+ and MM driver) and/or specific dedicated hardware.
+
+ Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.<BR>
+ Copyright (c) Microsoft Corporation.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+#include <PiMm.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+
+#include <Guid/MmCoreData.h>
+#include <Guid/MmramMemoryReserve.h>
+
+//
+// Maximum support address used to check input buffer
+//
+extern EFI_PHYSICAL_ADDRESS mMmMemLibInternalMaximumSupportAddress;
+extern EFI_MMRAM_DESCRIPTOR *mMmMemLibInternalMmramRanges;
+extern UINTN mMmMemLibInternalMmramCount;
+
+/**
+ Calculate and save the maximum support address.
+
+**/
+VOID
+MmMemLibInternalCalculateMaximumSupportAddress (
+ VOID
+ )
+{
+ VOID *Hob;
+ UINT32 RegEax;
+ UINT8 PhysicalAddressBits;
+
+ //
+ // Get physical address bits supported.
+ //
+ Hob = GetFirstHob (EFI_HOB_TYPE_CPU);
+ if (Hob != NULL) {
+ PhysicalAddressBits = ((EFI_HOB_CPU *) Hob)->SizeOfMemorySpace;
+ } else {
+ AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
+ if (RegEax >= 0x80000008) {
+ AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);
+ PhysicalAddressBits = (UINT8) RegEax;
+ } else {
+ PhysicalAddressBits = 36;
+ }
+ }
+ //
+ // IA-32e paging translates 48-bit linear addresses to 52-bit physical addresses.
+ //
+ ASSERT (PhysicalAddressBits <= 52);
+ if (PhysicalAddressBits > 48) {
+ PhysicalAddressBits = 48;
+ }
+
+ //
+ // Save the maximum support address in one global variable
+ //
+ mMmMemLibInternalMaximumSupportAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)(LShiftU64 (1, PhysicalAddressBits) - 1);
+ DEBUG ((DEBUG_INFO, "mMmMemLibInternalMaximumSupportAddress = 0x%lx\n", mMmMemLibInternalMaximumSupportAddress));
+}
+
+/**
+ Initialize cached Mmram Ranges from HOB.
+
+ @retval EFI_UNSUPPORTED The routine is unable to extract MMRAM information.
+ @retval EFI_SUCCESS MmRanges are populated successfully.
+
+**/
+EFI_STATUS
+MmMemLibInternalPopulateMmramRanges (
+ VOID
+ )
+{
+ VOID *HobStart;
+ EFI_HOB_GUID_TYPE *GuidHob;
+ MM_CORE_DATA_HOB_DATA *DataInHob;
+ MM_CORE_PRIVATE_DATA *MmCorePrivateData;
+ EFI_HOB_GUID_TYPE *MmramRangesHob;
+ EFI_MMRAM_HOB_DESCRIPTOR_BLOCK *MmramRangesHobData;
+ EFI_MMRAM_DESCRIPTOR *MmramDescriptors;
+
+ HobStart = GetHobList ();
+ DEBUG ((DEBUG_INFO, "%a - 0x%x\n", __FUNCTION__, HobStart));
+
+ //
+ // Extract MM Core Private context from the Hob. If absent search for
+ // a Hob containing the MMRAM ranges
+ //
+ GuidHob = GetNextGuidHob (&gMmCoreDataHobGuid, HobStart);
+ if (GuidHob == NULL) {
+ MmramRangesHob = GetFirstGuidHob (&gEfiMmPeiMmramMemoryReserveGuid);
+ if (MmramRangesHob == NULL) {
+ return EFI_UNSUPPORTED;
+ }
+
+ MmramRangesHobData = GET_GUID_HOB_DATA (MmramRangesHob);
+ if (MmramRangesHobData == NULL || MmramRangesHobData->Descriptor == NULL) {
+ return EFI_UNSUPPORTED;
+ }
+
+ mMmMemLibInternalMmramCount = MmramRangesHobData->NumberOfMmReservedRegions;
+ MmramDescriptors = MmramRangesHobData->Descriptor;
+ } else {
+ DataInHob = GET_GUID_HOB_DATA (GuidHob);
+ if (DataInHob == NULL) {
+ return EFI_UNSUPPORTED;
+ }
+
+ MmCorePrivateData = (MM_CORE_PRIVATE_DATA *) (UINTN) DataInHob->Address;
+ if (MmCorePrivateData == NULL || MmCorePrivateData->MmramRanges == 0) {
+ return EFI_UNSUPPORTED;
+ }
+
+ mMmMemLibInternalMmramCount = (UINTN) MmCorePrivateData->MmramRangeCount;
+ MmramDescriptors = (EFI_MMRAM_DESCRIPTOR *) (UINTN) MmCorePrivateData->MmramRanges;
+ }
+
+ mMmMemLibInternalMmramRanges = AllocatePool (mMmMemLibInternalMmramCount * sizeof (EFI_MMRAM_DESCRIPTOR));
+ if (mMmMemLibInternalMmramRanges) {
+ CopyMem (mMmMemLibInternalMmramRanges,
+ MmramDescriptors,
+ mMmMemLibInternalMmramCount * sizeof (EFI_MMRAM_DESCRIPTOR));
+ }
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Deinitialize cached Mmram Ranges.
+
+**/
+VOID
+MmMemLibInternalFreeMmramRanges (
+ VOID
+ )
+{
+ if (mMmMemLibInternalMmramRanges != NULL) {
+ FreePool (mMmMemLibInternalMmramRanges);
+ }
+}
+
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