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audk/MdePkg/Library/DxeMemoryAllocationLib/MemoryAllocationLib.c

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/** @file
Support routines for memory allocation routines for use with drivers.
Copyright (c) 2006, Intel Corporation<BR>
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name: MemoryAllocationLib.c
**/
/**
Allocates the number of 4KB pages specified by Pages of a certain memory type.
@param MemoryType The type of memory to allocate.
@param Pages The number of 4 KB pages to allocate.
@return A pointer to the allocated buffer. The buffer returned is aligned on a 4KB boundary.<BR>
If Pages is 0, then NULL is returned.<BR>
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
InternalAllocatePages (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages
)
{
EFI_STATUS Status;
EFI_PHYSICAL_ADDRESS Memory;
if (Pages == 0) {
return NULL;
}
Status = gBS->AllocatePages (AllocateAnyPages, MemoryType, Pages, &Memory);
if (EFI_ERROR (Status)) {
Memory = 0;
}
return (VOID *) (UINTN) Memory;
}
/**
Allocates the number of 4KB pages specified by Pages of type EfiBootServicesData.
@param Pages The number of 4 KB pages to allocate.
@return A pointer to the allocated buffer. The buffer returned is aligned on a 4KB boundary.<BR>
If Pages is 0, then NULL is returned.<BR>
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocatePages (
IN UINTN Pages
)
{
return InternalAllocatePages (EfiBootServicesData, Pages);
}
/**
Allocates the number of 4KB pages specified by Pages of type EfiRuntimeServicesData.
@param Pages The number of 4 KB pages to allocate.
@return A pointer to the allocated buffer. The buffer returned is aligned on a 4KB boundary.<BR>
If Pages is 0, then NULL is returned.<BR>
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateRuntimePages (
IN UINTN Pages
)
{
return InternalAllocatePages (EfiRuntimeServicesData, Pages);
}
/**
Allocates the number of 4KB pages specified by Pages of type EfiReservedMemoryType.
@param Pages The number of 4 KB pages to allocate.
@return A pointer to the allocated buffer. The buffer returned is aligned on a 4KB boundary.<BR>
If Pages is 0, then NULL is returned.<BR>
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateReservedPages (
IN UINTN Pages
)
{
return InternalAllocatePages (EfiReservedMemoryType, Pages);
}
/**
Frees one or more 4KB pages that were previously allocated with
one of the page allocation functions in the Memory Allocation Library.
@param Buffer Pointer to the buffer of pages to free.
@param Pages The number of 4 KB pages to free.
**/
VOID
EFIAPI
FreePages (
IN VOID *Buffer,
IN UINTN Pages
)
{
EFI_STATUS Status;
ASSERT (Pages != 0);
Status = gBS->FreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) Buffer, Pages);
ASSERT_EFI_ERROR (Status);
}
/**
Allocates the number of 4KB pages specified by Pages of a certian memory type
with an alignment specified by Alignment.
@param MemoryType The type of memory to allocate.
@param Pages The number of 4 KB pages to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return The allocated buffer is returned.<BR>
If Pages is 0, then NULL is returned.<BR>
If there is not enough memory at the specified alignment remaining to satisfy the request, then NULL is returned.
**/
VOID *
InternalAllocateAlignedPages (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
IN UINTN Alignment
)
{
EFI_STATUS Status;
EFI_PHYSICAL_ADDRESS Memory;
UINTN AlignedMemory;
UINTN AlignmentMask;
UINTN UnalignedPages;
UINTN RealPages;
//
// Alignment must be a power of two or zero.
//
ASSERT ((Alignment & (Alignment - 1)) == 0);
if (Pages == 0) {
return NULL;
}
if (Alignment > EFI_PAGE_SIZE) {
//
// Caculate the total number of pages since alignment is larger than page size.
//
AlignmentMask = Alignment - 1;
RealPages = Pages + EFI_SIZE_TO_PAGES (Alignment);
//
// Make sure that Pages plus EFI_SIZE_TO_PAGES (Alignment) does not overflow.
//
ASSERT (RealPages > Pages);
Status = gBS->AllocatePages (AllocateAnyPages, MemoryType, RealPages, &Memory);
if (EFI_ERROR (Status)) {
return NULL;
}
AlignedMemory = ((UINTN) Memory + AlignmentMask) & ~AlignmentMask;
UnalignedPages = EFI_SIZE_TO_PAGES ((UINTN) Memory - AlignedMemory);
if (UnalignedPages > 0) {
//
// Free first unaligned page(s).
//
Status = gBS->FreePages (Memory, UnalignedPages);
ASSERT_EFI_ERROR (Status);
}
Memory = (EFI_PHYSICAL_ADDRESS) (AlignedMemory + EFI_PAGES_TO_SIZE (Pages));
UnalignedPages = RealPages - Pages - UnalignedPages;
if (UnalignedPages > 0) {
//
// Free last unaligned page(s).
//
Status = gBS->FreePages (Memory, UnalignedPages);
ASSERT_EFI_ERROR (Status);
}
} else {
//
// Do not over-allocate pages in this case.
//
Status = gBS->AllocatePages (AllocateAnyPages, MemoryType, Pages, &Memory);
if (EFI_ERROR (Status)) {
return NULL;
}
AlignedMemory = (UINTN) Memory;
}
return (VOID *) AlignedMemory;
}
/**
Allocates the number of 4KB pages specified by Pages of type EfiBootServicesData
with an alignment specified by Alignment.
@param Pages The number of 4 KB pages to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return The allocated buffer is returned.<BR>
If Pages is 0, then NULL is returned.<BR>
If there is not enough memory at the specified alignment remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedPages (
IN UINTN Pages,
IN UINTN Alignment
)
{
return InternalAllocateAlignedPages (EfiBootServicesData, Pages, Alignment);
}
/**
Allocates the number of 4KB pages specified by Pages of type EfiRuntimeServicesData
with an alignment specified by Alignment.
@param Pages The number of 4 KB pages to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return The allocated buffer is returned. If Pages is 0, then NULL is returned.
If there is not enough memory at the specified alignment remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedRuntimePages (
IN UINTN Pages,
IN UINTN Alignment
)
{
return InternalAllocateAlignedPages (EfiRuntimeServicesData, Pages, Alignment);
}
/**
Allocates one or more 4KB pages of type EfiReservedMemoryType at a specified alignment.
@param Pages The number of 4 KB pages to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return The allocated buffer is returned. If Pages is 0, then NULL is returned.
If there is not enough memory at the specified alignment remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedReservedPages (
IN UINTN Pages,
IN UINTN Alignment
)
{
return InternalAllocateAlignedPages (EfiReservedMemoryType, Pages, Alignment);
}
/**
Frees one or more 4KB pages that were previously allocated with
one of the aligned page allocation functions in the Memory Allocation Library.
@param Buffer Pointer to the buffer of pages to free.
@param Pages The number of 4 KB pages to free.
**/
VOID
EFIAPI
FreeAlignedPages (
IN VOID *Buffer,
IN UINTN Pages
)
{
EFI_STATUS Status;
ASSERT (Pages != 0);
Status = gBS->FreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) Buffer, Pages);
ASSERT_EFI_ERROR (Status);
}
/**
Allocates a buffer of a certain memory type.
@param MemoryType The type of memory to allocate.
@param AllocationSize The number of bytes to allocate.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
InternalAllocatePool (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN AllocationSize
)
{
EFI_STATUS Status;
VOID *Memory;
Status = gBS->AllocatePool (MemoryType, AllocationSize, &Memory);
if (EFI_ERROR (Status)) {
Memory = NULL;
}
return Memory;
}
/**
Allocates a buffer of type EfiBootServicesData.
@param AllocationSize The number of bytes to allocate.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocatePool (
IN UINTN AllocationSize
)
{
return InternalAllocatePool (EfiBootServicesData, AllocationSize);
}
/**
Allocates a buffer of type EfiRuntimeServicesData.
@param AllocationSize The number of bytes to allocate.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateRuntimePool (
IN UINTN AllocationSize
)
{
return InternalAllocatePool (EfiRuntimeServicesData, AllocationSize);
}
/**
Allocates a buffer of type EfiReservedMemoryType.
@param AllocationSize The number of bytes to allocate.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateReservedPool (
IN UINTN AllocationSize
)
{
return InternalAllocatePool (EfiReservedMemoryType, AllocationSize);
}
/**
Allocates and zeros a buffer of a certian pool type.
@param PoolType The type of memory to allocate.
@param AllocationSize The number of bytes to allocate and zero.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
InternalAllocateZeroPool (
IN EFI_MEMORY_TYPE PoolType,
IN UINTN AllocationSize
)
{
VOID *Memory;
Memory = InternalAllocatePool (PoolType, AllocationSize);
if (Memory != NULL) {
Memory = ZeroMem (Memory, AllocationSize);
}
return Memory;
}
/**
Allocates and zeros a buffer of type EfiBootServicesData.
@param AllocationSize The number of bytes to allocate and zero.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateZeroPool (
IN UINTN AllocationSize
)
{
return InternalAllocateZeroPool (EfiBootServicesData, AllocationSize);
}
/**
Allocates and zeros a buffer of type EfiRuntimeServicesData.
@param AllocationSize The number of bytes to allocate and zero.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateRuntimeZeroPool (
IN UINTN AllocationSize
)
{
return InternalAllocateZeroPool (EfiRuntimeServicesData, AllocationSize);
}
/**
Allocates and zeros a buffer of type EfiReservedMemoryType.
@param AllocationSize The number of bytes to allocate and zero.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateReservedZeroPool (
IN UINTN AllocationSize
)
{
return InternalAllocateZeroPool (EfiReservedMemoryType, AllocationSize);
}
/**
Copies a buffer to an allocated buffer of a certian memory type.
@param MemoryType The type of pool to allocate.
@param AllocationSize The number of bytes to allocate and zero.
@param Buffer The buffer to copy to the allocated buffer.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
InternalAllocateCopyPool (
IN EFI_MEMORY_TYPE PoolType,
IN UINTN AllocationSize,
IN CONST VOID *Buffer
)
{
VOID *Memory;
ASSERT (Buffer != NULL);
ASSERT (AllocationSize <= (MAX_ADDRESS - (UINTN) Buffer + 1));
Memory = InternalAllocatePool (PoolType, AllocationSize);
if (Memory != NULL) {
Memory = CopyMem (Memory, Buffer, AllocationSize);
}
return Memory;
}
/**
Copies a buffer to an allocated buffer of type EfiBootServicesData.
@param AllocationSize The number of bytes to allocate.
@param Buffer The buffer to copy to the allocated buffer.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer
)
{
return InternalAllocateCopyPool (EfiBootServicesData, AllocationSize, Buffer);
}
/**
Copies a buffer to an allocated buffer of type EfiRuntimeServicesData.
@param AllocationSize The number of bytes to allocate.
@param Buffer The buffer to copy to the allocated buffer.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateRuntimeCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer
)
{
return InternalAllocateCopyPool (EfiRuntimeServicesData, AllocationSize, Buffer);
}
/**
Copies a buffer to an allocated buffer of type EfiReservedMemoryType.
@param AllocationSize The number of bytes to allocate.
@param Buffer The buffer to copy to the allocated buffer.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateReservedCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer
)
{
return InternalAllocateCopyPool (EfiReservedMemoryType, AllocationSize, Buffer);
}
/**
Copies a buffer to an allocated buffer of type EfiReservedMemoryType at a specified alignment.
@param Buffer Pointer to the buffer to free.
**/
VOID
EFIAPI
FreePool (
IN VOID *Buffer
)
{
EFI_STATUS Status;
Status = gBS->FreePool (Buffer);
ASSERT_EFI_ERROR (Status);
}
/**
Allocates a buffer of a certain pool type at a specified alignment.
@param PoolType The type of pool to allocate.
@param AllocationSize The number of bytes to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two. If Alignment is zero, then byte alignment is used.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
InternalAllocateAlignedPool (
IN EFI_MEMORY_TYPE PoolType,
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
VOID *RawAddress;
UINTN AlignedAddress;
UINTN AlignmentMask;
UINTN OverAllocationSize;
UINTN RealAllocationSize;
VOID **FreePointer;
//
// Alignment must be a power of two or zero.
//
ASSERT ((Alignment & (Alignment - 1)) == 0);
if (Alignment == 0) {
AlignmentMask = Alignment;
} else {
AlignmentMask = Alignment - 1;
}
//
// Calculate the extra memory size, over-allocate memory pool and get the aligned memory address.
//
OverAllocationSize = sizeof (RawAddress) + AlignmentMask;
RealAllocationSize = AllocationSize + OverAllocationSize;
//
// Make sure that AllocationSize plus OverAllocationSize does not overflow.
//
ASSERT (RealAllocationSize > AllocationSize);
RawAddress = InternalAllocatePool (PoolType, RealAllocationSize);
if (RawAddress == NULL) {
return NULL;
}
AlignedAddress = ((UINTN) RawAddress + OverAllocationSize) & ~AlignmentMask;
//
// Save the original memory address just before the aligned address.
//
FreePointer = (VOID **)(AlignedAddress - sizeof (RawAddress));
*FreePointer = RawAddress;
return (VOID *) AlignedAddress;
}
/**
Allocates a buffer of type EfiBootServicesData at a specified alignment.
@param AllocationSize The number of bytes to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two. If Alignment is zero, then byte alignment is used.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedPool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return InternalAllocateAlignedPool (EfiBootServicesData, AllocationSize, Alignment);
}
/**
Allocates a buffer of type EfiRuntimeServicesData at a specified alignment.
@param AllocationSize The number of bytes to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedRuntimePool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return InternalAllocateAlignedPool (EfiRuntimeServicesData, AllocationSize, Alignment);
}
/**
Allocates a buffer of type EfiReservedMemoryType at a specified alignment.
@param AllocationSize The number of bytes to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedReservedPool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return InternalAllocateAlignedPool (EfiReservedMemoryType, AllocationSize, Alignment);
}
/**
Allocates and zeros a buffer of type EfiBootServicesData at a specified alignment.
@param PoolType The type of pool to allocate.
@param AllocationSize The number of bytes to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
InternalAllocateAlignedZeroPool (
IN EFI_MEMORY_TYPE PoolType,
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
VOID *Memory;
Memory = InternalAllocateAlignedPool (PoolType, AllocationSize, Alignment);
if (Memory != NULL) {
Memory = ZeroMem (Memory, AllocationSize);
}
return Memory;
}
/**
Allocates and zeros a buffer of type EfiBootServicesData at a specified alignment.
@param AllocationSize The number of bytes to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedZeroPool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return InternalAllocateAlignedZeroPool (EfiBootServicesData, AllocationSize, Alignment);
}
/**
Allocates and zeros a buffer of type EfiRuntimeServicesData at a specified alignment.
@param AllocationSize The number of bytes to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedRuntimeZeroPool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return InternalAllocateAlignedZeroPool (EfiRuntimeServicesData, AllocationSize, Alignment);
}
/**
Allocates and zeros a buffer of type EfiReservedMemoryType at a specified alignment.
@param AllocationSize The number of bytes to allocate.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedReservedZeroPool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return InternalAllocateAlignedZeroPool (EfiReservedMemoryType, AllocationSize, Alignment);
}
/**
Copies a buffer to an allocated buffer of type EfiBootServicesData at a specified alignment.
@param PoolType The type of pool to allocate.
@param AllocationSize The number of bytes to allocate.
@param Buffer The buffer to copy to the allocated buffer.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
InternalAllocateAlignedCopyPool (
IN EFI_MEMORY_TYPE PoolType,
IN UINTN AllocationSize,
IN CONST VOID *Buffer,
IN UINTN Alignment
)
{
VOID *Memory;
ASSERT (Buffer != NULL);
ASSERT (AllocationSize <= (MAX_ADDRESS - (UINTN) Buffer + 1));
Memory = InternalAllocateAlignedPool (PoolType, AllocationSize, Alignment);
if (Memory != NULL) {
Memory = CopyMem (Memory, Buffer, AllocationSize);
}
return Memory;
}
/**
Copies a buffer to an allocated buffer of type EfiBootServicesData at a specified alignment.
@param AllocationSize The number of bytes to allocate.
@param Buffer The buffer to copy to the allocated buffer.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer,
IN UINTN Alignment
)
{
return InternalAllocateAlignedCopyPool (EfiBootServicesData, AllocationSize, Buffer, Alignment);
}
/**
Copies a buffer to an allocated buffer of type EfiRuntimeServicesData at a specified alignment.
@param AllocationSize The number of bytes to allocate.
@param Buffer The buffer to copy to the allocated buffer.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedRuntimeCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer,
IN UINTN Alignment
)
{
return InternalAllocateAlignedCopyPool (EfiRuntimeServicesData, AllocationSize, Buffer, Alignment);
}
/**
Copies a buffer to an allocated buffer of type EfiReservedMemoryType at a specified alignment.
@param AllocationSize The number of bytes to allocate.
@param Buffer The buffer to copy to the allocated buffer.
@param Alignment The requested alignment of the allocation. Must be a power of two.
If Alignment is zero, then byte alignment is used.
@return A pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned.
If there is not enough memory remaining to satisfy the request, then NULL is returned.
**/
VOID *
EFIAPI
AllocateAlignedReservedCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer,
IN UINTN Alignment
)
{
return InternalAllocateAlignedCopyPool (EfiReservedMemoryType, AllocationSize, Buffer, Alignment);
}
/**
Frees a buffer that was previously allocated with one of the aligned pool allocation functions
in the Memory Allocation Library.
@param Buffer Pointer to the buffer to free.
**/
VOID
EFIAPI
FreeAlignedPool (
IN VOID *Buffer
)
{
VOID *RawAddress;
VOID **FreePointer;
EFI_STATUS Status;
//
// Get the pre-saved original address in the over-allocate pool.
//
FreePointer = (VOID **)((UINTN) Buffer - sizeof (RawAddress));
RawAddress = *FreePointer;
Status = gBS->FreePool (RawAddress);
ASSERT_EFI_ERROR (Status);
}
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