projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| a40e0b7a AB |
1 | /** @file\r |
| 2 | DxeServicesLib memory allocation routines\r | |
| 3 | \r | |
| 4 | Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>\r | |
| 5 | \r | |
| 9344f092 | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| a40e0b7a AB |
7 | \r |
| 8 | **/\r | |
| 9 | \r | |
| 10 | #include <PiDxe.h>\r | |
| 11 | #include <Library/HobLib.h>\r | |
| 12 | #include <Library/UefiBootServicesTableLib.h>\r | |
| 13 | #include <Library/DxeServicesLib.h>\r | |
| 14 | \r | |
| 15 | /**\r | |
| 16 | Allocates one or more 4KB pages of a given type from a memory region that is\r | |
| 17 | accessible to PEI.\r | |
| 18 | \r | |
| 19 | Allocates the number of 4KB pages of type 'MemoryType' and returns a\r | |
| 20 | pointer to the allocated buffer. The buffer returned is aligned on a 4KB\r | |
| 21 | boundary. If Pages is 0, then NULL is returned. If there is not enough\r | |
| 22 | memory remaining to satisfy the request, then NULL is returned.\r | |
| 23 | \r | |
| 24 | @param[in] MemoryType The memory type to allocate\r | |
| 25 | @param[in] Pages The number of 4 KB pages to allocate.\r | |
| 26 | \r | |
| 27 | @return A pointer to the allocated buffer or NULL if allocation fails.\r | |
| 28 | \r | |
| 29 | **/\r | |
| 30 | VOID *\r | |
| 31 | EFIAPI\r | |
| 32 | AllocatePeiAccessiblePages (\r | |
| 33 | IN EFI_MEMORY_TYPE MemoryType,\r | |
| 34 | IN UINTN Pages\r | |
| 35 | )\r | |
| 36 | {\r | |
| 37 | EFI_STATUS Status;\r | |
| 38 | EFI_ALLOCATE_TYPE AllocType;\r | |
| 39 | EFI_PHYSICAL_ADDRESS Memory;\r | |
| 40 | EFI_HOB_HANDOFF_INFO_TABLE *PhitHob;\r | |
| 41 | \r | |
| 42 | if (Pages == 0) {\r | |
| 43 | return NULL;\r | |
| 44 | }\r | |
| 45 | \r | |
| 46 | AllocType = AllocateAnyPages;\r | |
| 47 | //\r | |
| 48 | // A X64 build of DXE may be combined with a 32-bit build of PEI, and so we\r | |
| 49 | // need to check the memory limit set by PEI, and allocate below 4 GB if the\r | |
| 50 | // limit is set to 4 GB or lower.\r | |
| 51 | //\r | |
| 52 | PhitHob = (EFI_HOB_HANDOFF_INFO_TABLE *)GetHobList ();\r | |
| 53 | if (PhitHob->EfiFreeMemoryTop <= MAX_UINT32) {\r | |
| 54 | AllocType = AllocateMaxAddress;\r | |
| 55 | Memory = MAX_UINT32;\r | |
| 56 | }\r | |
| 57 | \r | |
| 58 | Status = gBS->AllocatePages (AllocType, MemoryType, Pages, &Memory);\r | |
| 59 | if (EFI_ERROR (Status)) {\r | |
| 60 | return NULL;\r | |
| 61 | }\r | |
| 62 | return (VOID *)(UINTN)Memory;\r | |
| 63 | }\r |