diff options
| author | Crystal Lee <CrystalLee@ami.com> | 2024-07-22 14:19:23 +0800 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2025-01-13 03:08:41 +0000 |
| commit | efaa102d006f242da52a17c81d824a5377da284b (patch) | |
| tree | 534d006dd49df99c7ff59bdb326992bd93cb835a /UefiCpuPkg | |
| parent | aaf0846fa251c9a86dfa8125cdd540c97ef1d232 (diff) | |
| download | edk2-efaa102d006f242da52a17c81d824a5377da284b.tar.gz | |
UefiCpuPkg: Produce EFI memory attributes protocol
Produce the protocol introduced in UEFI v2.10 that permits the caller to
manage mapping permissions in the page tables.
Cc: Felix Polyudov <felixp@ami.com>
Cc: David Hsieh <davidhsieh@ami.com>
Cc: James Wang <jameswang@ami.com>
Signed-off-by: Crystal Lee <crystallee@ami.com>
Diffstat (limited to 'UefiCpuPkg')
| -rw-r--r-- | UefiCpuPkg/CpuDxe/CpuDxe.c | 5 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuDxe/CpuDxe.inf | 1 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuDxe/CpuPageTable.c | 295 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuDxe/CpuPageTable.h | 12 |
4 files changed, 313 insertions, 0 deletions
diff --git a/UefiCpuPkg/CpuDxe/CpuDxe.c b/UefiCpuPkg/CpuDxe/CpuDxe.c index bf03978710..472de55180 100644 --- a/UefiCpuPkg/CpuDxe/CpuDxe.c +++ b/UefiCpuPkg/CpuDxe/CpuDxe.c @@ -1034,6 +1034,11 @@ InitializeCpu ( ASSERT_EFI_ERROR (Status);
//
+ // Install EFI memory attribute Protocol
+ //
+ InstallEfiMemoryAttributeProtocol (mCpuHandle);
+
+ //
// Refresh GCD memory space map according to MTRR value.
//
RefreshGcdMemoryAttributes ();
diff --git a/UefiCpuPkg/CpuDxe/CpuDxe.inf b/UefiCpuPkg/CpuDxe/CpuDxe.inf index fca74c44b3..b2954ba234 100644 --- a/UefiCpuPkg/CpuDxe/CpuDxe.inf +++ b/UefiCpuPkg/CpuDxe/CpuDxe.inf @@ -75,6 +75,7 @@ [Protocols]
gEfiCpuArchProtocolGuid ## PRODUCES
+ gEfiMemoryAttributeProtocolGuid ## PRODUCES
gEfiMpServiceProtocolGuid ## PRODUCES
gEfiSmmBase2ProtocolGuid ## SOMETIMES_CONSUMES
diff --git a/UefiCpuPkg/CpuDxe/CpuPageTable.c b/UefiCpuPkg/CpuDxe/CpuPageTable.c index 5b1dec2d67..52c50b073b 100644 --- a/UefiCpuPkg/CpuDxe/CpuPageTable.c +++ b/UefiCpuPkg/CpuDxe/CpuPageTable.c @@ -1437,3 +1437,298 @@ InitializePageTableLib ( return;
}
+
+/**
+ This function set given attributes of the memory region specified by
+ BaseAddress and Length.
+ The valid Attributes is EFI_MEMORY_RP, EFI_MEMORY_XP, and EFI_MEMORY_RO.
+
+ @param This The EFI_MEMORY_ATTRIBUTE_PROTOCOL instance.
+ @param BaseAddress The physical address that is the start address of
+ a memory region.
+ @param Length The size in bytes of the memory region.
+ @param Attributes The bit mask of attributes to set for the memory
+ region.
+
+ @retval EFI_SUCCESS The attributes were set for the memory region.
+ @retval EFI_INVALID_PARAMETER Length is zero.
+ Attributes specified an illegal combination of
+ attributes that cannot be set together.
+ @retval EFI_UNSUPPORTED The processor does not support one or more
+ bytes of the memory resource range specified
+ by BaseAddress and Length.
+ The bit mask of attributes is not supported for
+ the memory resource range specified by
+ BaseAddress and Length.
+ @retval EFI_OUT_OF_RESOURCES Requested attributes cannot be applied due to lack of
+ system resources.
+ @retval EFI_ACCESS_DENIED Attributes for the requested memory region are
+ controlled by system firmware and cannot be updated
+ via the protocol.
+**/
+EFI_STATUS
+EFIAPI
+EfiSetMemoryAttributes (
+ IN EFI_MEMORY_ATTRIBUTE_PROTOCOL *This,
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,
+ IN UINT64 Length,
+ IN UINT64 Attributes
+ )
+{
+ RETURN_STATUS Status;
+ BOOLEAN IsModified;
+ BOOLEAN IsSplitted;
+
+ DEBUG ((DEBUG_VERBOSE, "%a: 0x%lx - 0x%lx (0x%lx)\n", __func__, BaseAddress, Length, Attributes));
+
+ if (Attributes == 0) {
+ DEBUG ((DEBUG_ERROR, "%a: Error - Attributes == 0\n", __func__));
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if ((Attributes & ~EFI_MEMORY_ACCESS_MASK) != 0) {
+ DEBUG ((DEBUG_ERROR, "%a: Error - Attributes(0x%lx) invalid\n", __func__, Attributes));
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if (Length == 0) {
+ DEBUG ((DEBUG_ERROR, "%a: Length is 0!\n", __func__));
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ Status = ConvertMemoryPageAttributes (NULL, BaseAddress, Length, Attributes, PageActionSet, NULL, &IsSplitted, &IsModified);
+ if (!EFI_ERROR (Status)) {
+ if (IsModified) {
+ //
+ // Flush TLB as last step.
+ //
+ // Note: Since APs will always init CR3 register in HLT loop mode or do
+ // TLB flush in MWAIT loop mode, there's no need to flush TLB for them
+ // here.
+ //
+ CpuFlushTlb ();
+ }
+ } else {
+ DEBUG ((DEBUG_ERROR, "%a: Failed in ConvertMemoryPageAttributes (%r)\n", __func__, Status));
+ }
+
+ return Status;
+}
+
+/**
+ This function clears given attributes of the memory region specified by
+ BaseAddress and Length.
+ The valid Attributes is EFI_MEMORY_RP, EFI_MEMORY_XP, and EFI_MEMORY_RO.
+ @param This The EFI_MEMORY_ATTRIBUTE_PROTOCOL instance.
+ @param BaseAddress The physical address that is the start address of
+ a memory region.
+ @param Length The size in bytes of the memory region.
+ @param Attributes The bit mask of attributes to clear for the memory
+ region.
+
+ @retval EFI_SUCCESS The attributes were cleared for the memory region.
+ @retval EFI_INVALID_PARAMETER Length is zero.
+ Attributes specified an illegal combination of
+ attributes that cannot be cleared together.
+ @retval EFI_UNSUPPORTED The processor does not support one or more
+ bytes of the memory resource range specified
+ by BaseAddress and Length.
+ The bit mask of attributes is not supported for
+ the memory resource range specified by
+ BaseAddress and Length.
+ @retval EFI_OUT_OF_RESOURCES Requested attributes cannot be applied due to lack of
+ system resources.
+ @retval EFI_ACCESS_DENIED Attributes for the requested memory region are
+ controlled by system firmware and cannot be updated
+ via the protocol.
+**/
+EFI_STATUS
+EFIAPI
+EfiClearMemoryAttributes (
+ IN EFI_MEMORY_ATTRIBUTE_PROTOCOL *This,
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,
+ IN UINT64 Length,
+ IN UINT64 Attributes
+ )
+{
+ RETURN_STATUS Status;
+ BOOLEAN IsModified;
+ BOOLEAN IsSplitted;
+
+ DEBUG ((DEBUG_VERBOSE, "%a: 0x%lx - 0x%lx (0x%lx)\n", __func__, BaseAddress, Length, Attributes));
+
+ if (Attributes == 0) {
+ DEBUG ((DEBUG_ERROR, "%a: Error - Attributes == 0\n", __func__));
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if ((Attributes & ~EFI_MEMORY_ACCESS_MASK) != 0) {
+ DEBUG ((DEBUG_ERROR, "%a: Error - Attributes(0x%lx) invalid\n", __func__, Attributes));
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if (Length == 0) {
+ DEBUG ((DEBUG_ERROR, "%a: Length is 0!\n", __func__));
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ Status = ConvertMemoryPageAttributes (NULL, BaseAddress, Length, Attributes, PageActionClear, NULL, &IsSplitted, &IsModified);
+ if (!EFI_ERROR (Status)) {
+ if (IsModified) {
+ //
+ // Flush TLB as last step.
+ //
+ // Note: Since APs will always init CR3 register in HLT loop mode or do
+ // TLB flush in MWAIT loop mode, there's no need to flush TLB for them
+ // here.
+ //
+ CpuFlushTlb ();
+ }
+ } else {
+ DEBUG ((DEBUG_ERROR, "%a: Failed in ConvertMemoryPageAttributes (%r)\n", __func__, Status));
+ }
+
+ return Status;
+}
+
+/**
+ This function retrieves the attributes of the memory region specified by
+ BaseAddress and Length. If different attributes are got from different part
+ of the memory region, EFI_NO_MAPPING will be returned.
+
+ @param This The EFI_MEMORY_ATTRIBUTE_PROTOCOL instance.
+ @param BaseAddress The physical address that is the start address of
+ a memory region.
+ @param Length The size in bytes of the memory region.
+ @param Attributes Pointer to attributes returned.
+
+ @retval EFI_SUCCESS The attributes got for the memory region.
+ @retval EFI_INVALID_PARAMETER Length is zero.
+ Attributes is NULL.
+ @retval EFI_NO_MAPPING Attributes are not consistent cross the memory
+ region.
+ @retval EFI_UNSUPPORTED The processor does not support one or more
+ bytes of the memory resource range specified
+ by BaseAddress and Length.
+**/
+EFI_STATUS
+EFIAPI
+EfiGetMemoryAttributes (
+ IN EFI_MEMORY_ATTRIBUTE_PROTOCOL *This,
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,
+ IN UINT64 Length,
+ OUT UINT64 *Attributes
+ )
+{
+ PAGE_TABLE_LIB_PAGING_CONTEXT CurrentPagingContext;
+ EFI_PHYSICAL_ADDRESS Address;
+ UINT64 *PageEntry;
+ UINT64 MemAttr;
+ PAGE_ATTRIBUTE PageAttr;
+ INT64 Size;
+ UINT64 AddressEncMask;
+
+ DEBUG ((DEBUG_VERBOSE, "%a: 0x%lx - 0x%lx\n", __func__, BaseAddress, Length));
+
+ if (!IS_ALIGNED (BaseAddress, EFI_PAGE_SIZE)) {
+ DEBUG ((DEBUG_ERROR, "%a: BaseAddress(0x%lx) is not aligned!\n", __func__, BaseAddress));
+ return EFI_UNSUPPORTED;
+ }
+
+ if (!IS_ALIGNED (Length, EFI_PAGE_SIZE)) {
+ DEBUG ((DEBUG_ERROR, "%a: Length(0x%lx) is not aligned!\n", __func__, Length));
+ return EFI_UNSUPPORTED;
+ }
+
+ if (Length == 0) {
+ DEBUG ((DEBUG_ERROR, "%a: Length is 0!\n", __func__));
+ return RETURN_INVALID_PARAMETER;
+ }
+
+ if (Attributes == NULL) {
+ DEBUG ((DEBUG_ERROR, "%a: Attributes is NULL\n", __func__));
+ return EFI_INVALID_PARAMETER;
+ }
+
+ Size = (INT64)Length;
+ MemAttr = (UINT64)-1;
+
+ // Make sure AddressEncMask is contained to smallest supported address field.
+ //
+ AddressEncMask = PcdGet64 (PcdPteMemoryEncryptionAddressOrMask) & PAGING_1G_ADDRESS_MASK_64;
+
+ GetCurrentPagingContext (&CurrentPagingContext);
+
+ do {
+ PageEntry = GetPageTableEntry (&CurrentPagingContext, BaseAddress, &PageAttr);
+ if ((PageEntry == NULL) || (PageAttr == PageNone)) {
+ return EFI_UNSUPPORTED;
+ }
+
+ //
+ // If the memory range is cross page table boundary, make sure they
+ // share the same attribute. Return EFI_NO_MAPPING if not.
+ //
+ *Attributes = GetAttributesFromPageEntry (PageEntry);
+ if ((MemAttr != (UINT64)-1) && (*Attributes != MemAttr)) {
+ return EFI_NO_MAPPING;
+ }
+
+ switch (PageAttr) {
+ case Page4K:
+ Address = *PageEntry & ~AddressEncMask & PAGING_4K_ADDRESS_MASK_64;
+ Size -= (EFI_PAGE_SIZE - (BaseAddress - Address));
+ BaseAddress += (EFI_PAGE_SIZE - (BaseAddress - Address));
+ break;
+
+ case Page2M:
+ Address = *PageEntry & ~AddressEncMask & PAGING_2M_ADDRESS_MASK_64;
+ Size -= SIZE_2MB - (BaseAddress - Address);
+ BaseAddress += SIZE_2MB - (BaseAddress - Address);
+ break;
+
+ case Page1G:
+ Address = *PageEntry & ~AddressEncMask & PAGING_1G_ADDRESS_MASK_64;
+ Size -= SIZE_1GB - (BaseAddress - Address);
+ BaseAddress += SIZE_1GB - (BaseAddress - Address);
+ break;
+
+ default:
+ return EFI_UNSUPPORTED;
+ }
+
+ MemAttr = *Attributes;
+ } while (Size > 0);
+
+ DEBUG ((DEBUG_VERBOSE, "%a: Attributes is 0x%lx\n", __func__, *Attributes));
+
+ return EFI_SUCCESS;
+}
+
+EFI_MEMORY_ATTRIBUTE_PROTOCOL mMemoryAttributeProtocol = {
+ EfiGetMemoryAttributes,
+ EfiSetMemoryAttributes,
+ EfiClearMemoryAttributes,
+};
+
+/**
+ Install Efi Memory Attribute Protocol.
+
+ @param Handle A pointer to the EFI_HANDLE on which the interface is to be installed
+
+**/
+VOID
+InstallEfiMemoryAttributeProtocol (
+ IN EFI_HANDLE Handle
+ )
+{
+ EFI_STATUS Status;
+
+ Status = gBS->InstallMultipleProtocolInterfaces (
+ &Handle,
+ &gEfiMemoryAttributeProtocolGuid,
+ &mMemoryAttributeProtocol,
+ NULL
+ );
+ ASSERT_EFI_ERROR (Status);
+}
diff --git a/UefiCpuPkg/CpuDxe/CpuPageTable.h b/UefiCpuPkg/CpuDxe/CpuPageTable.h index 607e936b8a..f2694452f5 100644 --- a/UefiCpuPkg/CpuDxe/CpuPageTable.h +++ b/UefiCpuPkg/CpuDxe/CpuPageTable.h @@ -10,6 +10,7 @@ #define _PAGE_TABLE_LIB_H_
#include <IndustryStandard/PeImage.h>
+#include <Protocol/MemoryAttribute.h>
#define PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_PSE BIT0
#define PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_PAE BIT1
@@ -153,4 +154,15 @@ GetPagingDetails ( OUT UINT32 **Attributes OPTIONAL
);
+/**
+ Install Efi Memory Attribute Protocol.
+
+ @param Handle A pointer to the EFI_HANDLE on which the interface is to be installed
+
+**/
+VOID
+InstallEfiMemoryAttributeProtocol (
+ IN EFI_HANDLE Handle
+ );
+
#endif
|