3) IA-32 Intel(R) Architecture Software Developer's Manual Volume 3:System Programmer's Guide, Intel\r
4) AMD64 Architecture Programmer's Manual Volume 2: System Programming\r
\r
-Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r
+\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
\r
#define SYS_CODE64_SEL 0x38\r
\r
+\r
#pragma pack(1)\r
\r
typedef union {\r
UINT64 Uint64;\r
} PAGE_MAP_AND_DIRECTORY_POINTER;\r
\r
+//\r
+// Page Table Entry 4KB\r
+//\r
+typedef union {\r
+ struct {\r
+ UINT64 Present:1; // 0 = Not present in memory, 1 = Present in memory\r
+ UINT64 ReadWrite:1; // 0 = Read-Only, 1= Read/Write\r
+ UINT64 UserSupervisor:1; // 0 = Supervisor, 1=User\r
+ UINT64 WriteThrough:1; // 0 = Write-Back caching, 1=Write-Through caching\r
+ UINT64 CacheDisabled:1; // 0 = Cached, 1=Non-Cached\r
+ UINT64 Accessed:1; // 0 = Not accessed, 1 = Accessed (set by CPU)\r
+ UINT64 Dirty:1; // 0 = Not Dirty, 1 = written by processor on access to page\r
+ UINT64 PAT:1; //\r
+ UINT64 Global:1; // 0 = Not global page, 1 = global page TLB not cleared on CR3 write\r
+ UINT64 Available:3; // Available for use by system software\r
+ UINT64 PageTableBaseAddress:40; // Page Table Base Address\r
+ UINT64 AvabilableHigh:11; // Available for use by system software\r
+ UINT64 Nx:1; // 0 = Execute Code, 1 = No Code Execution\r
+ } Bits;\r
+ UINT64 Uint64;\r
+} PAGE_TABLE_4K_ENTRY;\r
+\r
//\r
// Page Table Entry 2MB\r
//\r
UINT64 Uint64;\r
} PAGE_TABLE_ENTRY;\r
\r
+//\r
+// Page Table Entry 1GB\r
+//\r
+typedef union {\r
+ struct {\r
+ UINT64 Present:1; // 0 = Not present in memory, 1 = Present in memory\r
+ UINT64 ReadWrite:1; // 0 = Read-Only, 1= Read/Write\r
+ UINT64 UserSupervisor:1; // 0 = Supervisor, 1=User\r
+ UINT64 WriteThrough:1; // 0 = Write-Back caching, 1=Write-Through caching\r
+ UINT64 CacheDisabled:1; // 0 = Cached, 1=Non-Cached\r
+ UINT64 Accessed:1; // 0 = Not accessed, 1 = Accessed (set by CPU)\r
+ UINT64 Dirty:1; // 0 = Not Dirty, 1 = written by processor on access to page\r
+ UINT64 MustBe1:1; // Must be 1 \r
+ UINT64 Global:1; // 0 = Not global page, 1 = global page TLB not cleared on CR3 write\r
+ UINT64 Available:3; // Available for use by system software\r
+ UINT64 PAT:1; //\r
+ UINT64 MustBeZero:17; // Must be zero;\r
+ UINT64 PageTableBaseAddress:22; // Page Table Base Address\r
+ UINT64 AvabilableHigh:11; // Available for use by system software\r
+ UINT64 Nx:1; // 0 = Execute Code, 1 = No Code Execution\r
+ } Bits;\r
+ UINT64 Uint64;\r
+} PAGE_TABLE_1G_ENTRY;\r
+\r
#pragma pack()\r
\r
+#define CR0_WP BIT16\r
+\r
+#define IA32_PG_P BIT0\r
+#define IA32_PG_RW BIT1\r
+#define IA32_PG_PS BIT7\r
+\r
+#define PAGING_PAE_INDEX_MASK 0x1FF\r
+\r
+#define PAGING_4K_ADDRESS_MASK_64 0x000FFFFFFFFFF000ull\r
+#define PAGING_2M_ADDRESS_MASK_64 0x000FFFFFFFE00000ull\r
+#define PAGING_1G_ADDRESS_MASK_64 0x000FFFFFC0000000ull\r
+\r
+#define PAGING_L1_ADDRESS_SHIFT 12\r
+#define PAGING_L2_ADDRESS_SHIFT 21\r
+#define PAGING_L3_ADDRESS_SHIFT 30\r
+#define PAGING_L4_ADDRESS_SHIFT 39\r
+\r
+#define PAGING_PML4E_NUMBER 4\r
+\r
+#define PAGE_TABLE_POOL_ALIGNMENT BASE_2MB\r
+#define PAGE_TABLE_POOL_UNIT_SIZE SIZE_2MB\r
+#define PAGE_TABLE_POOL_UNIT_PAGES EFI_SIZE_TO_PAGES (PAGE_TABLE_POOL_UNIT_SIZE)\r
+#define PAGE_TABLE_POOL_ALIGN_MASK \\r
+ (~(EFI_PHYSICAL_ADDRESS)(PAGE_TABLE_POOL_ALIGNMENT - 1))\r
+\r
+typedef struct {\r
+ VOID *NextPool;\r
+ UINTN Offset;\r
+ UINTN FreePages;\r
+} PAGE_TABLE_POOL;\r
+\r
+/**\r
+ Enable Execute Disable Bit.\r
+\r
+**/\r
+VOID\r
+EnableExecuteDisableBit (\r
+ VOID\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
/**\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
\r
OUT VOID **TemplateBase\r
);\r
\r
+/**\r
+ Clear legacy memory located at the first 4K-page.\r
+\r
+ This function traverses the whole HOB list to check if memory from 0 to 4095\r
+ exists and has not been allocated, and then clear it if so.\r
+\r
+ @param HobStart The start of HobList passed to DxeCore.\r
+\r
+**/\r
+VOID\r
+ClearFirst4KPage (\r
+ IN VOID *HobStart\r
+ );\r
+\r
+/**\r
+ Return configure status of NULL pointer detection feature.\r
+\r
+ @return TRUE NULL pointer detection feature is enabled\r
+ @return FALSE NULL pointer detection feature is disabled\r
+**/\r
+BOOLEAN\r
+IsNullDetectionEnabled (\r
+ VOID\r
+ );\r
+\r
+/**\r
+ Prevent the memory pages used for page table from been overwritten.\r
+\r
+ @param[in] PageTableBase Base address of page table (CR3).\r
+ @param[in] Level4Paging Level 4 paging flag.\r
+\r
+**/\r
+VOID\r
+EnablePageTableProtection (\r
+ IN UINTN PageTableBase,\r
+ IN BOOLEAN Level4Paging\r
+ );\r
+\r
+/**\r
+ This API provides a way to allocate memory for page table.\r
+\r
+ This API can be called more than once to allocate memory for page tables.\r
+\r
+ Allocates the number of 4KB pages and returns a pointer to the allocated\r
+ buffer. The buffer returned is aligned on a 4KB boundary.\r
+\r
+ If Pages is 0, then NULL is returned.\r
+ If there is not enough memory remaining to satisfy the request, then NULL is\r
+ returned.\r
+\r
+ @param Pages The number of 4 KB pages to allocate.\r
+\r
+ @return A pointer to the allocated buffer or NULL if allocation fails.\r
+\r
+**/\r
+VOID *\r
+AllocatePageTableMemory (\r
+ IN UINTN Pages\r
+ );\r
\r
#endif \r
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