2) IA-32 Intel(R) Architecture Software Developer's Manual Volume 2:Instruction Set Reference, Intel\r
3) IA-32 Intel(R) Architecture Software Developer's Manual Volume 3:System Programmer's Guide, Intel\r
\r
-Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution. The full text of the license may be found at\r
#include "DxeIpl.h"\r
#include "VirtualMemory.h"\r
\r
+/**\r
+ Enable Execute Disable Bit.\r
+\r
+**/\r
+VOID\r
+EnableExecuteDisableBit (\r
+ VOID\r
+ )\r
+{\r
+ UINT64 MsrRegisters;\r
+\r
+ MsrRegisters = AsmReadMsr64 (0xC0000080);\r
+ MsrRegisters |= BIT11;\r
+ AsmWriteMsr64 (0xC0000080, MsrRegisters);\r
+}\r
+\r
+/**\r
+ Split 2M page to 4K.\r
+\r
+ @param[in] PhysicalAddress Start physical address the 2M page covered.\r
+ @param[in, out] PageEntry2M Pointer to 2M page entry.\r
+ @param[in] StackBase Stack base address.\r
+ @param[in] StackSize Stack size.\r
+\r
+**/\r
+VOID\r
+Split2MPageTo4K (\r
+ IN EFI_PHYSICAL_ADDRESS PhysicalAddress,\r
+ IN OUT UINT64 *PageEntry2M,\r
+ IN EFI_PHYSICAL_ADDRESS StackBase,\r
+ IN UINTN StackSize\r
+ )\r
+{\r
+ EFI_PHYSICAL_ADDRESS PhysicalAddress4K;\r
+ UINTN IndexOfPageTableEntries;\r
+ PAGE_TABLE_4K_ENTRY *PageTableEntry;\r
+\r
+ PageTableEntry = AllocatePages (1);\r
+ //\r
+ // Fill in 2M page entry.\r
+ //\r
+ *PageEntry2M = (UINT64) (UINTN) PageTableEntry | IA32_PG_P | IA32_PG_RW;\r
+\r
+ PhysicalAddress4K = PhysicalAddress;\r
+ for (IndexOfPageTableEntries = 0; IndexOfPageTableEntries < 512; IndexOfPageTableEntries++, PageTableEntry++, PhysicalAddress4K += SIZE_4KB) {\r
+ //\r
+ // Fill in the Page Table entries\r
+ //\r
+ PageTableEntry->Uint64 = (UINT64) PhysicalAddress4K;\r
+ PageTableEntry->Bits.ReadWrite = 1;\r
+ PageTableEntry->Bits.Present = 1;\r
+ if ((PhysicalAddress4K >= StackBase) && (PhysicalAddress4K < StackBase + StackSize)) {\r
+ //\r
+ // Set Nx bit for stack.\r
+ //\r
+ PageTableEntry->Bits.Nx = 1;\r
+ }\r
+ }\r
+}\r
+\r
+/**\r
+ Split 1G page to 2M.\r
+\r
+ @param[in] PhysicalAddress Start physical address the 1G page covered.\r
+ @param[in, out] PageEntry1G Pointer to 1G page entry.\r
+ @param[in] StackBase Stack base address.\r
+ @param[in] StackSize Stack size.\r
+\r
+**/\r
+VOID\r
+Split1GPageTo2M (\r
+ IN EFI_PHYSICAL_ADDRESS PhysicalAddress,\r
+ IN OUT UINT64 *PageEntry1G,\r
+ IN EFI_PHYSICAL_ADDRESS StackBase,\r
+ IN UINTN StackSize\r
+ )\r
+{\r
+ EFI_PHYSICAL_ADDRESS PhysicalAddress2M;\r
+ UINTN IndexOfPageDirectoryEntries;\r
+ PAGE_TABLE_ENTRY *PageDirectoryEntry;\r
+\r
+ PageDirectoryEntry = AllocatePages (1);\r
+ //\r
+ // Fill in 1G page entry.\r
+ //\r
+ *PageEntry1G = (UINT64) (UINTN) PageDirectoryEntry | IA32_PG_P | IA32_PG_RW;\r
+\r
+ PhysicalAddress2M = PhysicalAddress;\r
+ for (IndexOfPageDirectoryEntries = 0; IndexOfPageDirectoryEntries < 512; IndexOfPageDirectoryEntries++, PageDirectoryEntry++, PhysicalAddress2M += SIZE_2MB) {\r
+ if ((PhysicalAddress2M < StackBase + StackSize) && ((PhysicalAddress2M + SIZE_2MB) > StackBase)) {\r
+ //\r
+ // Need to split this 2M page that covers stack range.\r
+ //\r
+ Split2MPageTo4K (PhysicalAddress2M, (UINT64 *) PageDirectoryEntry, StackBase, StackSize);\r
+ } else {\r
+ //\r
+ // Fill in the Page Directory entries\r
+ //\r
+ PageDirectoryEntry->Uint64 = (UINT64) PhysicalAddress2M;\r
+ PageDirectoryEntry->Bits.ReadWrite = 1;\r
+ PageDirectoryEntry->Bits.Present = 1;\r
+ PageDirectoryEntry->Bits.MustBe1 = 1;\r
+ }\r
+ }\r
+}\r
+\r
/**\r
Allocates and fills in the Page Directory and Page Table Entries to\r
establish a 1:1 Virtual to Physical mapping.\r
\r
- @param NumberOfProcessorPhysicalAddressBits Number of processor address bits \r
- to use. Limits the number of page \r
- table entries to the physical \r
- address space. \r
+ @param[in] StackBase Stack base address.\r
+ @param[in] StackSize Stack size.\r
\r
@return The address of 4 level page map.\r
\r
**/\r
UINTN\r
CreateIdentityMappingPageTables (\r
- VOID\r
+ IN EFI_PHYSICAL_ADDRESS StackBase,\r
+ IN UINTN StackSize\r
)\r
{ \r
UINT32 RegEax;\r
PageDirectory1GEntry = (VOID *) PageDirectoryPointerEntry;\r
\r
for (IndexOfPageDirectoryEntries = 0; IndexOfPageDirectoryEntries < 512; IndexOfPageDirectoryEntries++, PageDirectory1GEntry++, PageAddress += SIZE_1GB) {\r
- //\r
- // Fill in the Page Directory entries\r
- //\r
- PageDirectory1GEntry->Uint64 = (UINT64)PageAddress;\r
- PageDirectory1GEntry->Bits.ReadWrite = 1;\r
- PageDirectory1GEntry->Bits.Present = 1;\r
- PageDirectory1GEntry->Bits.MustBe1 = 1;\r
+ if (PcdGetBool (PcdSetNxForStack) && (PageAddress < StackBase + StackSize) && ((PageAddress + SIZE_1GB) > StackBase)) {\r
+ Split1GPageTo2M (PageAddress, (UINT64 *) PageDirectory1GEntry, StackBase, StackSize);\r
+ } else {\r
+ //\r
+ // Fill in the Page Directory entries\r
+ //\r
+ PageDirectory1GEntry->Uint64 = (UINT64)PageAddress;\r
+ PageDirectory1GEntry->Bits.ReadWrite = 1;\r
+ PageDirectory1GEntry->Bits.Present = 1;\r
+ PageDirectory1GEntry->Bits.MustBe1 = 1;\r
+ }\r
}\r
} else {\r
for (IndexOfPdpEntries = 0; IndexOfPdpEntries < NumberOfPdpEntriesNeeded; IndexOfPdpEntries++, PageDirectoryPointerEntry++) {\r
PageDirectoryPointerEntry->Bits.Present = 1;\r
\r
for (IndexOfPageDirectoryEntries = 0; IndexOfPageDirectoryEntries < 512; IndexOfPageDirectoryEntries++, PageDirectoryEntry++, PageAddress += SIZE_2MB) {\r
- //\r
- // Fill in the Page Directory entries\r
- //\r
- PageDirectoryEntry->Uint64 = (UINT64)PageAddress;\r
- PageDirectoryEntry->Bits.ReadWrite = 1;\r
- PageDirectoryEntry->Bits.Present = 1;\r
- PageDirectoryEntry->Bits.MustBe1 = 1;\r
+ if (PcdGetBool (PcdSetNxForStack) && (PageAddress < StackBase + StackSize) && ((PageAddress + SIZE_2MB) > StackBase)) {\r
+ //\r
+ // Need to split this 2M page that covers stack range.\r
+ //\r
+ Split2MPageTo4K (PageAddress, (UINT64 *) PageDirectoryEntry, StackBase, StackSize);\r
+ } else {\r
+ //\r
+ // Fill in the Page Directory entries\r
+ //\r
+ PageDirectoryEntry->Uint64 = (UINT64)PageAddress;\r
+ PageDirectoryEntry->Bits.ReadWrite = 1;\r
+ PageDirectoryEntry->Bits.Present = 1;\r
+ PageDirectoryEntry->Bits.MustBe1 = 1;\r
+ }\r
}\r
}\r
\r
);\r
}\r
\r
+ if (PcdGetBool (PcdSetNxForStack)) {\r
+ EnableExecuteDisableBit ();\r
+ }\r
+\r
return (UINTN)PageMap;\r
}\r
\r
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