ArmPkg/Mmu: Support page size granularity in the initial MMU setting

    
Formerly, it was only possible to use section size granularity for the
translation table regions.
This change allows to define initial translation table regions with
4K-byte granularty (page size granularity).



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11467 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 130 insertions, 10 deletions

diff --git a/ArmPkg/Library/ArmLib/ArmV7/ArmV7Mmu.c b/ArmPkg/Library/ArmLib/ArmV7/ArmV7Mmu.c
index 9bb3c26..3ba66d6 100644
--- a/ArmPkg/Library/ArmLib/ArmV7/ArmV7Mmu.c
+++ b/ArmPkg/Library/ArmLib/ArmV7/ArmV7Mmu.c
@@ -19,21 +19,119 @@
 #include <Library/MemoryAllocationLib.h>

 #include <Library/ArmLib.h>

 #include <Library/BaseLib.h>

+#include <Library/DebugLib.h>

 #include "ArmV7Lib.h"

 #include "ArmLibPrivate.h"

 

 VOID

+PopulateLevel2PageTable (

+  IN UINT32                         *SectionEntry,

+  IN UINT32                         PhysicalBase,

+  IN UINT32                         RemainLength,

+  IN ARM_MEMORY_REGION_ATTRIBUTES   Attributes

+  ) {

+  UINT32* PageEntry;

+  UINT32  Pages;

+  UINT32  Index;

+  UINT32  PageAttributes;

+  UINT32  SectionDescriptor;

+  UINT32  TranslationTable;

+  UINT32  BaseSectionAddress;

+

+  switch (Attributes) {

+    case ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK:

+    case ARM_MEMORY_REGION_ATTRIBUTE_SECURE_WRITE_BACK:

+      PageAttributes = TT_DESCRIPTOR_PAGE_WRITE_BACK;

+      break;

+    case ARM_MEMORY_REGION_ATTRIBUTE_WRITE_THROUGH:

+    case ARM_MEMORY_REGION_ATTRIBUTE_SECURE_WRITE_THROUGH:

+      PageAttributes = TT_DESCRIPTOR_PAGE_WRITE_THROUGH;

+      break;

+    case ARM_MEMORY_REGION_ATTRIBUTE_DEVICE:

+    case ARM_MEMORY_REGION_ATTRIBUTE_SECURE_DEVICE:

+      PageAttributes = TT_DESCRIPTOR_PAGE_DEVICE;

+      break;

+    case ARM_MEMORY_REGION_ATTRIBUTE_UNCACHED_UNBUFFERED:

+    case ARM_MEMORY_REGION_ATTRIBUTE_SECURE_UNCACHED_UNBUFFERED:

+      PageAttributes = TT_DESCRIPTOR_PAGE_UNCACHED;

+      break;

+    default:

+      PageAttributes = TT_DESCRIPTOR_PAGE_UNCACHED;

+      break;

+  }

+

+  // Check if the Section Entry has already been populated. Otherwise attach a

+  // Level 2 Translation Table to it

+  if (*SectionEntry != 0) {

+    // The entry must be a page table. Otherwise it exists an overlapping in the memory map

+    if (TT_DESCRIPTOR_SECTION_TYPE_IS_PAGE_TABLE(*SectionEntry)) {

+      TranslationTable = *SectionEntry & TT_DESCRIPTOR_SECTION_PAGETABLE_ADDRESS_MASK;

+    } else if ((*SectionEntry & TT_DESCRIPTOR_SECTION_TYPE_MASK) == TT_DESCRIPTOR_SECTION_TYPE_SECTION) {

+      // Case where a virtual memory map descriptor overlapped a section entry

+

+      // Allocate a Level2 Page Table for this Section

+      TranslationTable = (UINTN)AllocatePages(EFI_SIZE_TO_PAGES(TRANSLATION_TABLE_PAGE_SIZE + TRANSLATION_TABLE_PAGE_ALIGNMENT));

+      TranslationTable = ((UINTN)TranslationTable + TRANSLATION_TABLE_PAGE_ALIGNMENT_MASK) & ~TRANSLATION_TABLE_PAGE_ALIGNMENT_MASK;

+

+      // Translate the Section Descriptor into Page Descriptor

+      SectionDescriptor = TT_DESCRIPTOR_PAGE_TYPE_PAGE;

+      SectionDescriptor |= TT_DESCRIPTOR_CONVERT_TO_PAGE_CACHE_POLICY(*SectionEntry,0);

+      SectionDescriptor |= TT_DESCRIPTOR_CONVERT_TO_PAGE_AP(*SectionEntry);

+      SectionDescriptor |= TT_DESCRIPTOR_CONVERT_TO_PAGE_XN(*SectionEntry,0);

+      SectionDescriptor |= TT_DESCRIPTOR_CONVERT_TO_PAGE_NG(*SectionEntry);

+      SectionDescriptor |= TT_DESCRIPTOR_CONVERT_TO_PAGE_S(*SectionEntry);

+

+      BaseSectionAddress = TT_DESCRIPTOR_SECTION_BASE_ADDRESS(*SectionEntry);

+

+      // Populate the new Level2 Page Table for the section

+      PageEntry = (UINT32*)TranslationTable;

+      for (Index = 0; Index < TRANSLATION_TABLE_PAGE_COUNT; Index++) {

+        PageEntry[Index] = TT_DESCRIPTOR_PAGE_BASE_ADDRESS(BaseSectionAddress + (Index << 12)) | SectionDescriptor;

+      }

+

+      // Overwrite the section entry to point to the new Level2 Translation Table

+      *SectionEntry = (TranslationTable & TT_DESCRIPTOR_SECTION_PAGETABLE_ADDRESS_MASK) |

+          (IS_ARM_MEMORY_REGION_ATTRIBUTES_SECURE(Attributes) ? (1 << 3) : 0) |

+          TT_DESCRIPTOR_SECTION_TYPE_PAGE_TABLE;

+    } else {

+      // We do not support the other section type (16MB Section)

+      ASSERT(0);

+      return;

+    }

+  } else {

+    TranslationTable = (UINTN)AllocatePages(EFI_SIZE_TO_PAGES(TRANSLATION_TABLE_PAGE_SIZE + TRANSLATION_TABLE_PAGE_ALIGNMENT));

+    TranslationTable = ((UINTN)TranslationTable + TRANSLATION_TABLE_PAGE_ALIGNMENT_MASK) & ~TRANSLATION_TABLE_PAGE_ALIGNMENT_MASK;

+

+    ZeroMem ((VOID *)TranslationTable, TRANSLATION_TABLE_PAGE_SIZE);

+

+    *SectionEntry = (TranslationTable & TT_DESCRIPTOR_SECTION_PAGETABLE_ADDRESS_MASK) |

+        (IS_ARM_MEMORY_REGION_ATTRIBUTES_SECURE(Attributes) ? (1 << 3) : 0) |

+        TT_DESCRIPTOR_SECTION_TYPE_PAGE_TABLE;

+  }

+

+  PageEntry = ((UINT32 *)(TranslationTable) + ((PhysicalBase & TT_DESCRIPTOR_PAGE_INDEX_MASK) >> TT_DESCRIPTOR_PAGE_BASE_SHIFT));

+  Pages     = RemainLength / TT_DESCRIPTOR_PAGE_SIZE;

+

+  for (Index = 0; Index < Pages; Index++) {

+    *PageEntry++     =  TT_DESCRIPTOR_PAGE_BASE_ADDRESS(PhysicalBase) | PageAttributes;

+    PhysicalBase += TT_DESCRIPTOR_PAGE_SIZE;

+  }

+

+}

+

+VOID

 FillTranslationTable (

   IN  UINT32                        *TranslationTable,

   IN  ARM_MEMORY_REGION_DESCRIPTOR  *MemoryRegion

   )

 {

-  UINT32  *Entry;

-  UINTN   Sections;

-  UINTN   Index;

+  UINT32  *SectionEntry;

   UINT32  Attributes;

   UINT32  PhysicalBase = MemoryRegion->PhysicalBase;

+  UINT32  RemainLength = MemoryRegion->Length;

   

+  ASSERT(MemoryRegion->Length > 0);

+

   switch (MemoryRegion->Attributes) {

     case ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK:

       Attributes = TT_DESCRIPTOR_SECTION_WRITE_BACK(0);

@@ -64,12 +162,34 @@ FillTranslationTable (
       break;

   }

   

-  Entry    = TRANSLATION_TABLE_ENTRY_FOR_VIRTUAL_ADDRESS(TranslationTable, MemoryRegion->VirtualBase);

-  Sections = MemoryRegion->Length / TT_DESCRIPTOR_SECTION_SIZE;

-  

-  for (Index = 0; Index < Sections; Index++) {

-    *Entry++     =  TT_DESCRIPTOR_SECTION_BASE_ADDRESS(PhysicalBase) | Attributes;

-    PhysicalBase += TT_DESCRIPTOR_SECTION_SIZE;

+  // Get the first section entry for this mapping

+  SectionEntry    = TRANSLATION_TABLE_ENTRY_FOR_VIRTUAL_ADDRESS(TranslationTable, MemoryRegion->VirtualBase);

+

+  while (RemainLength != 0) {

+    if (PhysicalBase % TT_DESCRIPTOR_SECTION_SIZE == 0) {

+      if (RemainLength >= TT_DESCRIPTOR_SECTION_SIZE) {

+        // Case: Physical address aligned on the Section Size (1MB) && the length is greater than the Section Size

+        *SectionEntry++ = TT_DESCRIPTOR_SECTION_BASE_ADDRESS(PhysicalBase) | Attributes;

+        PhysicalBase += TT_DESCRIPTOR_SECTION_SIZE;

+      } else {

+        // Case: Physical address aligned on the Section Size (1MB) && the length does not fill a section

+        PopulateLevel2PageTable(SectionEntry++,PhysicalBase,RemainLength,MemoryRegion->Attributes);

+

+        // It must be the last entry

+        break;

+      }

+    } else {

+      // Case: Physical address NOT aligned on the Section Size (1MB)

+      PopulateLevel2PageTable(SectionEntry++,PhysicalBase,RemainLength,MemoryRegion->Attributes);

+      // Aligned the address

+      PhysicalBase = (PhysicalBase + TT_DESCRIPTOR_SECTION_SIZE) & ~(TT_DESCRIPTOR_SECTION_SIZE-1);

+

+      // If it is the last entry

+      if (RemainLength < TT_DESCRIPTOR_SECTION_SIZE) {

+        break;

+      }

+    }

+    RemainLength -= TT_DESCRIPTOR_SECTION_SIZE;

   }

 }

 

@@ -111,7 +231,7 @@ ArmConfigureMmu (
   ArmCleanInvalidateDataCache();

   ArmInvalidateInstructionCache();

 

-  TranslationTableAttribute = 0;

+  TranslationTableAttribute = (ARM_MEMORY_REGION_ATTRIBUTES)0;

   while (MemoryTable->Length != 0) {

     // Find the memory attribute for the Translation Table

     if ((TranslationTable >= MemoryTable->PhysicalBase) && (TranslationTable < MemoryTable->PhysicalBase + MemoryTable->Length)) {