38ba4a64c5
GetNextEntryAttribute() is currently applying a 64-bit mask
(TT_ATTRIBUTES_MASK) to a 32-bit descriptor value (EntryType).
The original descriptor was 64 bits containing the upper and
lower attributes which are included in TT_ATTRIBUTES_MASK.
The PrevEntryAttribute parameter is also a UINT32, but passed to
PageAttributeToGcdAttribute() for a UINT64 parameter where the
function checks masks in the upper 32 bits of the integer value:
PageAttributeToGcdAttribute (*PrevEntryAttribute)
...
STATIC
UINT64
PageAttributeToGcdAttribute (
IN UINT64 PageAttributes
)
...
if ((PageAttributes & (TT_PXN_MASK | TT_UXN_MASK)) != 0) {
GcdAttributes |= EFI_MEMORY_XP;
}
...
#define TT_PXN_MASK BIT53
#define TT_UXN_MASK BIT54 // EL1&0
This change removes UINT32 intermediary values. For EntryType,
eliminating an unncessary cast. For EntryAttribute, preserving the
upper and lower attributes for evaluation in
PageAttributeToGcdAttribute().
This also resolves the following compiler warning previously present
on Visual Studio for the assignment to the previously 32-bit local
variables.
'=': conversion from 'UINT64' to 'UINT32', possible loss of data
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
560 lines
18 KiB
C
560 lines
18 KiB
C
/*++
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Copyright (c) 2009, Hewlett-Packard Company. All rights reserved.<BR>
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Portions copyright (c) 2010, Apple Inc. All rights reserved.<BR>
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Portions copyright (c) 2011-2021, Arm Limited. All rights reserved.<BR>
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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--*/
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#include <Library/MemoryAllocationLib.h>
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#include "CpuDxe.h"
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#define INVALID_ENTRY ((UINT64)~0)
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#define MIN_T0SZ 16
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#define BITS_PER_LEVEL 9
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/**
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Parses T0SZ to determine the level and number of entries at the root
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of the translation table.
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@param T0SZ The T0SZ value to be parsed.
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@param RootTableLevel The level of the root table.
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@param RootTableEntryCount The number of entries in the root table.
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**/
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STATIC
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VOID
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GetRootTranslationTableInfo (
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IN UINTN T0SZ,
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OUT UINTN *RootTableLevel,
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OUT UINTN *RootTableEntryCount
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)
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{
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*RootTableLevel = (T0SZ - MIN_T0SZ) / BITS_PER_LEVEL;
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*RootTableEntryCount = TT_ENTRY_COUNT >> (T0SZ - MIN_T0SZ) % BITS_PER_LEVEL;
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}
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/**
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Converts ARM translation table attributes to GCD attributes.
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@param PageAttributes The translation table attributes to be converted.
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@retval The analogous GCD attributes.
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**/
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STATIC
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UINT64
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PageAttributeToGcdAttribute (
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IN UINT64 PageAttributes
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)
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{
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UINT64 GcdAttributes;
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switch (PageAttributes & TT_ATTR_INDX_MASK) {
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case TT_ATTR_INDX_DEVICE_MEMORY:
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GcdAttributes = EFI_MEMORY_UC;
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break;
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case TT_ATTR_INDX_MEMORY_NON_CACHEABLE:
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GcdAttributes = EFI_MEMORY_WC;
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break;
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case TT_ATTR_INDX_MEMORY_WRITE_THROUGH:
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GcdAttributes = EFI_MEMORY_WT;
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break;
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case TT_ATTR_INDX_MEMORY_WRITE_BACK:
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GcdAttributes = EFI_MEMORY_WB;
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break;
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default:
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DEBUG ((
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DEBUG_ERROR,
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"PageAttributeToGcdAttribute: PageAttributes:0x%lX not supported.\n",
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PageAttributes
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));
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ASSERT (0);
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// The Global Coherency Domain (GCD) value is defined as a bit set.
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// Returning 0 means no attribute has been set.
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GcdAttributes = 0;
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}
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// Determine protection attributes
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if ((PageAttributes & TT_AF) == 0) {
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GcdAttributes |= EFI_MEMORY_RP;
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}
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if (((PageAttributes & TT_AP_MASK) == TT_AP_NO_RO) ||
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((PageAttributes & TT_AP_MASK) == TT_AP_RO_RO))
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{
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// Read only cases map to write-protect
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GcdAttributes |= EFI_MEMORY_RO;
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}
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// Process eXecute Never attribute
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if ((PageAttributes & (TT_PXN_MASK | TT_UXN_MASK)) != 0) {
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GcdAttributes |= EFI_MEMORY_XP;
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}
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return GcdAttributes;
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}
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/**
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Convert an arch specific set of page attributes into a mask
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of EFI_MEMORY_xx constants.
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@param PageAttributes The set of page attributes.
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@retval The mask of EFI_MEMORY_xx constants.
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**/
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UINT64
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RegionAttributeToGcdAttribute (
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IN UINTN PageAttributes
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)
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{
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return PageAttributeToGcdAttribute (PageAttributes);
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}
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/**
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Retrieves the attribute of the first page entry in the translation table.
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@param[in] FirstLevelTableAddress The base address of the translation table.
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@param[in] TableLevel The current level being traversed.
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@retval The attributes of the first page entry found, or INVALID_ENTRY.
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**/
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STATIC
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UINT64
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GetFirstPageAttribute (
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IN UINT64 *FirstLevelTableAddress,
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IN UINTN TableLevel
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)
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{
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UINT64 FirstEntry;
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// Get the first entry of the table
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FirstEntry = *FirstLevelTableAddress;
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if ((TableLevel != 3) && ((FirstEntry & TT_TYPE_MASK) == TT_TYPE_TABLE_ENTRY)) {
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// Only valid for Levels 0, 1 and 2
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// Get the attribute of the subsequent table
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return GetFirstPageAttribute ((UINT64 *)(FirstEntry & TT_ADDRESS_MASK_DESCRIPTION_TABLE), TableLevel + 1);
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} else if (((FirstEntry & TT_TYPE_MASK) == TT_TYPE_BLOCK_ENTRY) ||
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((TableLevel == 3) && ((FirstEntry & TT_TYPE_MASK) == TT_TYPE_BLOCK_ENTRY_LEVEL3)))
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{
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return FirstEntry & TT_ATTRIBUTES_MASK;
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} else {
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return INVALID_ENTRY;
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}
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}
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/**
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This function recursively traverses the translation table heirarchy to
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synchronise the GCD with the translation table.
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@param[in] TableAddress The address of the table being processed.
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@param[in] EntryCount The number of entries in the current level of the table.
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@param[in] TableLevel The current level of the memory table being processed.
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@param[in] BaseAddress The starting address of the region.
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@param[in, out] PrevEntryAttribute The attributes of the previous region.
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@param[in, out] StartGcdRegion The start of the GCD region.
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@retval The address at the end of the last region processed.
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**/
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STATIC
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UINT64
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GetNextEntryAttribute (
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IN UINT64 *TableAddress,
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IN UINTN EntryCount,
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IN UINTN TableLevel,
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IN UINT64 BaseAddress,
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IN OUT UINT64 *PrevEntryAttribute,
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IN OUT UINT64 *StartGcdRegion
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)
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{
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UINTN Index;
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UINT64 Entry;
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UINT64 EntryAttribute;
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UINT64 EntryType;
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EFI_STATUS Status;
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UINTN NumberOfDescriptors;
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EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemorySpaceMap;
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// Get the memory space map from GCD
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MemorySpaceMap = NULL;
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Status = gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemorySpaceMap);
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if (EFI_ERROR (Status) || (TableLevel > 3)) {
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ASSERT_EFI_ERROR (Status);
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ASSERT (TableLevel <= 3);
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return 0;
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}
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// While the top level table might not contain TT_ENTRY_COUNT entries;
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// the subsequent ones should be filled up
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for (Index = 0; Index < EntryCount; Index++) {
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Entry = TableAddress[Index];
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EntryType = Entry & TT_TYPE_MASK;
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EntryAttribute = Entry & TT_ATTRIBUTES_MASK;
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// If Entry is a Table Descriptor type entry then go through the sub-level table
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if ((EntryType == TT_TYPE_BLOCK_ENTRY) ||
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((TableLevel == 3) && (EntryType == TT_TYPE_BLOCK_ENTRY_LEVEL3)))
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{
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if ((*PrevEntryAttribute == INVALID_ENTRY) || (EntryAttribute != *PrevEntryAttribute)) {
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if (*PrevEntryAttribute != INVALID_ENTRY) {
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// Update GCD with the last region
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SetGcdMemorySpaceAttributes (
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MemorySpaceMap,
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NumberOfDescriptors,
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*StartGcdRegion,
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(BaseAddress + (Index * TT_ADDRESS_AT_LEVEL (TableLevel))) - *StartGcdRegion,
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PageAttributeToGcdAttribute (*PrevEntryAttribute)
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);
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}
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// Start of the new region
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*StartGcdRegion = BaseAddress + (Index * TT_ADDRESS_AT_LEVEL (TableLevel));
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*PrevEntryAttribute = EntryAttribute;
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} else {
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continue;
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}
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} else if (EntryType == TT_TYPE_TABLE_ENTRY) {
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// Table Entry type is only valid for Level 0, 1, 2
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ASSERT (TableLevel < 3);
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// Increase the level number and scan the sub-level table
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GetNextEntryAttribute (
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(UINT64 *)(Entry & TT_ADDRESS_MASK_DESCRIPTION_TABLE),
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TT_ENTRY_COUNT,
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TableLevel + 1,
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(BaseAddress + (Index * TT_ADDRESS_AT_LEVEL (TableLevel))),
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PrevEntryAttribute,
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StartGcdRegion
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);
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} else {
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if (*PrevEntryAttribute != INVALID_ENTRY) {
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// Update GCD with the last region
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SetGcdMemorySpaceAttributes (
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MemorySpaceMap,
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NumberOfDescriptors,
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*StartGcdRegion,
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(BaseAddress + (Index * TT_ADDRESS_AT_LEVEL (TableLevel))) - *StartGcdRegion,
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PageAttributeToGcdAttribute (*PrevEntryAttribute)
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);
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// Start of the new region
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*StartGcdRegion = BaseAddress + (Index * TT_ADDRESS_AT_LEVEL (TableLevel));
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*PrevEntryAttribute = INVALID_ENTRY;
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}
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}
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}
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FreePool (MemorySpaceMap);
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return BaseAddress + (EntryCount * TT_ADDRESS_AT_LEVEL (TableLevel));
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}
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/**
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Sync the GCD memory space attributes with the translation table.
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@param[in] CpuProtocol The CPU architectural protocol instance.
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@retval EFI_SUCCESS The GCD memory space attributes are synced with
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the MMU page table.
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@retval Others The return value of GetMemorySpaceMap().
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**/
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EFI_STATUS
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SyncCacheConfig (
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IN EFI_CPU_ARCH_PROTOCOL *CpuProtocol
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)
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{
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EFI_STATUS Status;
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UINT64 PageAttribute;
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UINT64 *FirstLevelTableAddress;
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UINTN TableLevel;
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UINTN TableCount;
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UINTN NumberOfDescriptors;
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EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemorySpaceMap;
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UINTN Tcr;
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UINTN T0SZ;
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UINT64 BaseAddressGcdRegion;
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UINT64 EndAddressGcdRegion;
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// This code assumes MMU is enabled and filed with section translations
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ASSERT (ArmMmuEnabled ());
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//
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// Get the memory space map from GCD
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//
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MemorySpaceMap = NULL;
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Status = gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemorySpaceMap);
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if (EFI_ERROR (Status)) {
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ASSERT_EFI_ERROR (Status);
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return Status;
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}
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// The GCD implementation maintains its own copy of the state of memory space attributes. GCD needs
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// to know what the initial memory space attributes are. The CPU Arch. Protocol does not provide a
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// GetMemoryAttributes function for GCD to get this so we must resort to calling GCD (as if we were
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// a client) to update its copy of the attributes. This is bad architecture and should be replaced
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// with a way for GCD to query the CPU Arch. driver of the existing memory space attributes instead.
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// Obtain page table base
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FirstLevelTableAddress = (UINT64 *)(ArmGetTTBR0BaseAddress ());
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// Get Translation Control Register value
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Tcr = ArmGetTCR ();
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// Get Address Region Size
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T0SZ = Tcr & TCR_T0SZ_MASK;
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// Get the level of the first table for the indicated Address Region Size
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GetRootTranslationTableInfo (T0SZ, &TableLevel, &TableCount);
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// First Attribute of the Page Tables
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PageAttribute = GetFirstPageAttribute (FirstLevelTableAddress, TableLevel);
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// We scan from the start of the memory map (ie: at the address 0x0)
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BaseAddressGcdRegion = 0x0;
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EndAddressGcdRegion = GetNextEntryAttribute (
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FirstLevelTableAddress,
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TableCount,
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TableLevel,
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BaseAddressGcdRegion,
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&PageAttribute,
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&BaseAddressGcdRegion
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);
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// Update GCD with the last region if valid
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if ((PageAttribute != INVALID_ENTRY) && (EndAddressGcdRegion > BaseAddressGcdRegion)) {
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SetGcdMemorySpaceAttributes (
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MemorySpaceMap,
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NumberOfDescriptors,
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BaseAddressGcdRegion,
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EndAddressGcdRegion - BaseAddressGcdRegion,
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PageAttributeToGcdAttribute (PageAttribute)
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);
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}
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FreePool (MemorySpaceMap);
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return EFI_SUCCESS;
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}
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/**
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Convert EFI memory attributes to ARM translation table attributes.
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@param[in] EfiAttributes EFI memory attributes.
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@retval The analogous translation table attributes.
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**/
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UINT64
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EfiAttributeToArmAttribute (
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IN UINT64 EfiAttributes
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)
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{
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UINT64 ArmAttributes;
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switch (EfiAttributes & EFI_MEMORY_CACHETYPE_MASK) {
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case EFI_MEMORY_UC:
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if (ArmReadCurrentEL () == AARCH64_EL2) {
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ArmAttributes = TT_ATTR_INDX_DEVICE_MEMORY | TT_XN_MASK;
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} else {
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ArmAttributes = TT_ATTR_INDX_DEVICE_MEMORY | TT_UXN_MASK | TT_PXN_MASK;
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}
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break;
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case EFI_MEMORY_WC:
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ArmAttributes = TT_ATTR_INDX_MEMORY_NON_CACHEABLE;
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break;
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case EFI_MEMORY_WT:
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ArmAttributes = TT_ATTR_INDX_MEMORY_WRITE_THROUGH | TT_SH_INNER_SHAREABLE;
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break;
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case EFI_MEMORY_WB:
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ArmAttributes = TT_ATTR_INDX_MEMORY_WRITE_BACK | TT_SH_INNER_SHAREABLE;
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break;
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default:
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ArmAttributes = TT_ATTR_INDX_MASK;
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}
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// Set the access flag to match the block attributes
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if ((EfiAttributes & EFI_MEMORY_RP) == 0) {
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ArmAttributes |= TT_AF;
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}
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// Determine protection attributes
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if ((EfiAttributes & EFI_MEMORY_RO) != 0) {
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ArmAttributes |= TT_AP_NO_RO;
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}
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// Process eXecute Never attribute
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if ((EfiAttributes & EFI_MEMORY_XP) != 0) {
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ArmAttributes |= TT_PXN_MASK;
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}
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return ArmAttributes;
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}
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/**
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This function returns the attributes of the memory region containing the
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specified address.
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RegionLength and RegionAttributes are only valid if the result is EFI_SUCCESS.
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@param[in] TranslationTable The translation table base address.
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@param[in] TableLevel The level of the translation table.
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@param[in] LastBlockEntry The last block address of the table level.
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@param[in, out] BaseAddress The base address of the memory region.
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@param[out] RegionLength The length of the memory region.
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@param[out] RegionAttributes The attributes of the memory region.
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@retval EFI_SUCCESS The attributes of the memory region were
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returned successfully.
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@retval EFI_NOT_FOUND The memory region was not found.
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@retval EFI_NO_MAPPING The translation table entry associated with
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BaseAddress is invalid.
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**/
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EFI_STATUS
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GetMemoryRegionRec (
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IN UINT64 *TranslationTable,
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IN UINTN TableLevel,
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IN UINT64 *LastBlockEntry,
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IN OUT UINTN *BaseAddress,
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OUT UINTN *RegionLength,
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OUT UINTN *RegionAttributes
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)
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{
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EFI_STATUS Status;
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UINT64 *NextTranslationTable;
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UINT64 *BlockEntry;
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UINT64 BlockEntryType;
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UINT64 EntryType;
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if (TableLevel != 3) {
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BlockEntryType = TT_TYPE_BLOCK_ENTRY;
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} else {
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BlockEntryType = TT_TYPE_BLOCK_ENTRY_LEVEL3;
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}
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// Find the block entry linked to the Base Address
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BlockEntry = (UINT64 *)TT_GET_ENTRY_FOR_ADDRESS (TranslationTable, TableLevel, *BaseAddress);
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EntryType = *BlockEntry & TT_TYPE_MASK;
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if ((TableLevel < 3) && (EntryType == TT_TYPE_TABLE_ENTRY)) {
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NextTranslationTable = (UINT64 *)(*BlockEntry & TT_ADDRESS_MASK_DESCRIPTION_TABLE);
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// The entry is a page table, so we go to the next level
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Status = GetMemoryRegionRec (
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NextTranslationTable, // Address of the next level page table
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TableLevel + 1, // Next Page Table level
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(UINTN *)TT_LAST_BLOCK_ADDRESS (NextTranslationTable, TT_ENTRY_COUNT),
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BaseAddress,
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RegionLength,
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RegionAttributes
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);
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// EFI_SUCCESS: The end of the end of the region was found.
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// EFI_NO_MAPPING: The translation entry associated with BaseAddress is invalid.
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if (Status != EFI_NOT_FOUND) {
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return Status;
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}
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// Now we processed the table move to the next entry
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BlockEntry++;
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} else if (EntryType == BlockEntryType) {
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// We have found the BlockEntry attached to the address. We save its start address (the start
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// address might be before the 'BaseAddress') and attributes
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*BaseAddress = *BaseAddress & ~(TT_ADDRESS_AT_LEVEL (TableLevel) - 1);
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*RegionLength = 0;
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*RegionAttributes = *BlockEntry & TT_ATTRIBUTES_MASK;
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} else {
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return EFI_NO_MAPPING;
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}
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while (BlockEntry <= LastBlockEntry) {
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if (((*BlockEntry & TT_TYPE_MASK) == BlockEntryType) &&
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((*BlockEntry & TT_ATTRIBUTES_MASK) == *RegionAttributes))
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{
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*RegionLength = *RegionLength + TT_BLOCK_ENTRY_SIZE_AT_LEVEL (TableLevel);
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} else {
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// In case we have found the end of the region we return success
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return EFI_SUCCESS;
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}
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BlockEntry++;
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}
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// If we have reached the end of the TranslationTable and we have not found the end of the region then
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// we return EFI_NOT_FOUND.
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// The caller will continue to look for the memory region at its level.
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return EFI_NOT_FOUND;
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}
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/**
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Retrieves a memory region from a given base address.
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This function retrieves a memory region starting from a given base address.
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@param[in, out] BaseAddress The base address from which to retrieve
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the memory region. On successful return, this is
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updated to the end address of the retrieved region.
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@param[out] RegionLength The length of the retrieved memory region.
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@param[out] RegionAttributes The attributes of the retrieved memory region.
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@retval EFI_STATUS Returns EFI_SUCCESS if the memory region is
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retrieved successfully, or the status of the
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recursive call to GetMemoryRegionRec.
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|
@retval EFI_NOT_FOUND The memory region was not found.
|
|
@retval EFI_NO_MAPPING The translation table entry associated with
|
|
BaseAddress is invalid.
|
|
@retval EFI_INVALID_PARAMETER One of the input parameters was NULL.
|
|
**/
|
|
EFI_STATUS
|
|
GetMemoryRegion (
|
|
IN OUT UINTN *BaseAddress,
|
|
OUT UINTN *RegionLength,
|
|
OUT UINTN *RegionAttributes
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
UINT64 *TranslationTable;
|
|
UINTN TableLevel;
|
|
UINTN EntryCount;
|
|
UINTN T0SZ;
|
|
|
|
if ((BaseAddress == NULL) || (RegionLength == NULL) || (RegionAttributes == NULL)) {
|
|
ASSERT ((BaseAddress != NULL) && (RegionLength != NULL) && (RegionAttributes != NULL));
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
TranslationTable = ArmGetTTBR0BaseAddress ();
|
|
|
|
// Initialize the output parameters. These paramaters are only valid if the
|
|
// result is EFI_SUCCESS.
|
|
*RegionLength = 0;
|
|
*RegionAttributes = 0;
|
|
|
|
T0SZ = ArmGetTCR () & TCR_T0SZ_MASK;
|
|
// Get the Table info from T0SZ
|
|
GetRootTranslationTableInfo (T0SZ, &TableLevel, &EntryCount);
|
|
|
|
Status = GetMemoryRegionRec (
|
|
TranslationTable,
|
|
TableLevel,
|
|
(UINTN *)TT_LAST_BLOCK_ADDRESS (TranslationTable, EntryCount),
|
|
BaseAddress,
|
|
RegionLength,
|
|
RegionAttributes
|
|
);
|
|
|
|
// If the region continues up to the end of the root table then GetMemoryRegionRec()
|
|
// will return EFI_NOT_FOUND. Check if the region length was updated.
|
|
if ((Status == EFI_NOT_FOUND) && (*RegionLength > 0)) {
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
return Status;
|
|
}
|