1 /** @file 2 3 Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR> 4 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 #include <Uefi.h> 16 17 #include <Library/MemoryAllocationLib.h> 18 #include <Library/UefiBootServicesTableLib.h> 19 #include <Library/BaseMemoryLib.h> 20 #include <Library/DebugLib.h> 21 #include <LockBoxLib.h> 22 23 /** 24 Allocate memory below 4G memory address. 25 26 This function allocates memory below 4G memory address. 27 28 @param MemoryType Memory type of memory to allocate. 29 @param Size Size of memory to allocate. 30 31 @return Allocated address for output. 32 33 **/ 34 STATIC 35 VOID * 36 AllocateMemoryBelow4G ( 37 IN EFI_MEMORY_TYPE MemoryType, 38 IN UINTN Size 39 ) 40 { 41 UINTN Pages; 42 EFI_PHYSICAL_ADDRESS Address; 43 EFI_STATUS Status; 44 VOID* Buffer; 45 UINTN AllocRemaining; 46 47 Pages = EFI_SIZE_TO_PAGES (Size); 48 Address = 0xffffffff; 49 50 // 51 // Since we need to use gBS->AllocatePages to get a buffer below 52 // 4GB, there is a good chance that space will be wasted for very 53 // small allocation. We keep track of unused portions of the page 54 // allocations, and use these to allocate memory for small buffers. 55 // 56 ASSERT (mLockBoxGlobal->Signature == LOCK_BOX_GLOBAL_SIGNATURE); 57 if ((UINTN) mLockBoxGlobal->SubPageRemaining >= Size) { 58 Buffer = (VOID*)(UINTN) mLockBoxGlobal->SubPageBuffer; 59 mLockBoxGlobal->SubPageBuffer += (UINT32) Size; 60 mLockBoxGlobal->SubPageRemaining -= (UINT32) Size; 61 return Buffer; 62 } 63 64 Status = gBS->AllocatePages ( 65 AllocateMaxAddress, 66 MemoryType, 67 Pages, 68 &Address 69 ); 70 if (EFI_ERROR (Status)) { 71 return NULL; 72 } 73 74 Buffer = (VOID *) (UINTN) Address; 75 ZeroMem (Buffer, EFI_PAGES_TO_SIZE (Pages)); 76 77 AllocRemaining = EFI_PAGES_TO_SIZE (Pages) - Size; 78 if (AllocRemaining > (UINTN) mLockBoxGlobal->SubPageRemaining) { 79 mLockBoxGlobal->SubPageBuffer = (UINT32) (Address + Size); 80 mLockBoxGlobal->SubPageRemaining = (UINT32) AllocRemaining; 81 } 82 83 return Buffer; 84 } 85 86 87 /** 88 Allocates a buffer of type EfiACPIMemoryNVS. 89 90 Allocates the number bytes specified by AllocationSize of type 91 EfiACPIMemoryNVS and returns a pointer to the allocated buffer. 92 If AllocationSize is 0, then a valid buffer of 0 size is 93 returned. If there is not enough memory remaining to satisfy 94 the request, then NULL is returned. 95 96 @param AllocationSize The number of bytes to allocate. 97 98 @return A pointer to the allocated buffer or NULL if allocation fails. 99 100 **/ 101 VOID * 102 EFIAPI 103 AllocateAcpiNvsPool ( 104 IN UINTN AllocationSize 105 ) 106 { 107 return AllocateMemoryBelow4G (EfiACPIMemoryNVS, AllocationSize); 108 } 109 110 111 EFI_STATUS 112 EFIAPI 113 LockBoxDxeLibInitialize ( 114 IN EFI_HANDLE ImageHandle, 115 IN EFI_SYSTEM_TABLE *SystemTable 116 ) 117 { 118 return LockBoxLibInitialize (); 119 } 120
