mirror of https://github.com/acidanthera/audk.git
120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/** @file
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Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Uefi.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <LockBoxLib.h>
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/**
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Allocate memory below 4G memory address.
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This function allocates memory below 4G memory address.
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@param MemoryType Memory type of memory to allocate.
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@param Size Size of memory to allocate.
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@return Allocated address for output.
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**/
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STATIC
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VOID *
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AllocateMemoryBelow4G (
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IN EFI_MEMORY_TYPE MemoryType,
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IN UINTN Size
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)
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{
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UINTN Pages;
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EFI_PHYSICAL_ADDRESS Address;
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EFI_STATUS Status;
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VOID* Buffer;
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UINTN AllocRemaining;
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Pages = EFI_SIZE_TO_PAGES (Size);
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Address = 0xffffffff;
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//
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// Since we need to use gBS->AllocatePages to get a buffer below
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// 4GB, there is a good chance that space will be wasted for very
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// small allocation. We keep track of unused portions of the page
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// allocations, and use these to allocate memory for small buffers.
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//
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ASSERT (mLockBoxGlobal->Signature == LOCK_BOX_GLOBAL_SIGNATURE);
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if ((UINTN) mLockBoxGlobal->SubPageRemaining >= Size) {
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Buffer = (VOID*)(UINTN) mLockBoxGlobal->SubPageBuffer;
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mLockBoxGlobal->SubPageBuffer += (UINT32) Size;
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mLockBoxGlobal->SubPageRemaining -= (UINT32) Size;
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return Buffer;
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}
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Status = gBS->AllocatePages (
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AllocateMaxAddress,
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MemoryType,
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Pages,
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&Address
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);
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if (EFI_ERROR (Status)) {
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return NULL;
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}
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Buffer = (VOID *) (UINTN) Address;
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ZeroMem (Buffer, EFI_PAGES_TO_SIZE (Pages));
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AllocRemaining = EFI_PAGES_TO_SIZE (Pages) - Size;
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if (AllocRemaining > (UINTN) mLockBoxGlobal->SubPageRemaining) {
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mLockBoxGlobal->SubPageBuffer = (UINT32) (Address + Size);
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mLockBoxGlobal->SubPageRemaining = (UINT32) AllocRemaining;
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}
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return Buffer;
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}
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/**
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Allocates a buffer of type EfiACPIMemoryNVS.
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Allocates the number bytes specified by AllocationSize of type
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EfiACPIMemoryNVS and returns a pointer to the allocated buffer.
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If AllocationSize is 0, then a valid buffer of 0 size is
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returned. If there is not enough memory remaining to satisfy
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the request, then NULL is returned.
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@param AllocationSize The number of bytes to allocate.
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@return A pointer to the allocated buffer or NULL if allocation fails.
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**/
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VOID *
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EFIAPI
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AllocateAcpiNvsPool (
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IN UINTN AllocationSize
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)
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{
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return AllocateMemoryBelow4G (EfiACPIMemoryNVS, AllocationSize);
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}
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EFI_STATUS
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EFIAPI
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LockBoxDxeLibInitialize (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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return LockBoxLibInitialize ();
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}
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