projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 73ccde8f XY |
1 | /** @file\r |
| 2 | Function to create page talbe.\r | |
| 3 | Only create page table for x64, and leave the CreatePageTable empty for Ia32.\r | |
| 4 | \r | |
| 5 | Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>\r | |
| 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
| 7 | \r | |
| 8 | **/\r | |
| 9 | #include <Library/CpuPageTableLib.h>\r | |
| 10 | #include <Library/MemoryAllocationLib.h>\r | |
| 11 | #include <Base.h>\r | |
| 12 | #include <Library/BaseMemoryLib.h>\r | |
| 13 | #include <Library/DebugLib.h>\r | |
| 14 | \r | |
| 15 | /**\r | |
| 16 | Create 1:1 mapping page table in reserved memory to map the specified address range.\r | |
| 17 | \r | |
| 18 | @param[in] LinearAddress The start of the linear address range.\r | |
| 19 | @param[in] Length The length of the linear address range.\r | |
| 20 | \r | |
| 21 | @return The page table to be created.\r | |
| 22 | **/\r | |
| 23 | UINTN\r | |
| 24 | CreatePageTable (\r | |
| 25 | IN UINTN Address,\r | |
| 26 | IN UINTN Length\r | |
| 27 | )\r | |
| 28 | {\r | |
| 29 | EFI_STATUS Status;\r | |
| 30 | VOID *PageTableBuffer;\r | |
| 31 | UINTN PageTableBufferSize;\r | |
| 32 | UINTN PageTable;\r | |
| 33 | \r | |
| 34 | IA32_MAP_ATTRIBUTE MapAttribute;\r | |
| 35 | IA32_MAP_ATTRIBUTE MapMask;\r | |
| 36 | \r | |
| 37 | MapAttribute.Uint64 = Address;\r | |
| 38 | MapAttribute.Bits.Present = 1;\r | |
| 39 | MapAttribute.Bits.ReadWrite = 1;\r | |
| 40 | \r | |
| 41 | MapMask.Bits.PageTableBaseAddress = 1;\r | |
| 42 | MapMask.Bits.Present = 1;\r | |
| 43 | MapMask.Bits.ReadWrite = 1;\r | |
| 44 | \r | |
| 45 | PageTable = 0;\r | |
| 46 | PageTableBufferSize = 0;\r | |
| 47 | \r | |
| 48 | Status = PageTableMap (\r | |
| 49 | &PageTable,\r | |
| 50 | Paging4Level,\r | |
| 51 | NULL,\r | |
| 52 | &PageTableBufferSize,\r | |
| 53 | Address,\r | |
| 54 | Length,\r | |
| 55 | &MapAttribute,\r | |
| 56 | &MapMask\r | |
| 57 | );\r | |
| 58 | ASSERT (Status == EFI_BUFFER_TOO_SMALL);\r | |
| 59 | DEBUG ((DEBUG_INFO, "AP Page Table Buffer Size = %x\n", PageTableBufferSize));\r | |
| 60 | \r | |
| 61 | PageTableBuffer = AllocateReservedPages (EFI_SIZE_TO_PAGES (PageTableBufferSize));\r | |
| 62 | ASSERT (PageTableBuffer != NULL);\r | |
| 63 | Status = PageTableMap (\r | |
| 64 | &PageTable,\r | |
| 65 | Paging4Level,\r | |
| 66 | PageTableBuffer,\r | |
| 67 | &PageTableBufferSize,\r | |
| 68 | Address,\r | |
| 69 | Length,\r | |
| 70 | &MapAttribute,\r | |
| 71 | &MapMask\r | |
| 72 | );\r | |
| 73 | ASSERT_EFI_ERROR (Status);\r | |
| 74 | return PageTable;\r | |
| 75 | }\r |