/** @file\r
- Memory Allocation Library Services\r
+ Provides services to allocate and free memory buffers of various memory types and alignments.\r
\r
- Copyright (c) 2006, Intel Corporation \r
- All rights reserved. This program and the accompanying materials \r
- are licensed and made available under the terms and conditions of the BSD License \r
- which accompanies this distribution. The full text of the license may be found at \r
- http://opensource.org/licenses/bsd-license.php \r
+ The Memory Allocation Library abstracts various common memory allocation operations. This library\r
+ allows code to be written in a phase-independent manner because the allocation of memory in PEI, DXE,\r
+ and SMM (for example) is done via a different mechanism. Using a common library interface makes it\r
+ much easier to port algorithms from phase to phase.\r
\r
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
+Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
+SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
\r
Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer. Buffer\r
must have been allocated on a previous call to the page allocation services of the Memory\r
- Allocation Library.\r
+ Allocation Library. If it is not possible to free allocated pages, then this function will\r
+ perform no actions.\r
+\r
If Buffer was not allocated with a page allocation function in the Memory Allocation Library,\r
then ASSERT().\r
If Pages is zero, then ASSERT().\r
- \r
+\r
@param Buffer Pointer to the buffer of pages to free.\r
@param Pages The number of 4 KB pages to free.\r
\r
alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is\r
returned. If there is not enough memory at the specified alignment remaining to satisfy the\r
request, then NULL is returned.\r
+\r
If Alignment is not a power of two and Alignment is not zero, then ASSERT().\r
+ If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, then ASSERT().\r
\r
@param Pages The number of 4 KB pages to allocate.\r
@param Alignment The requested alignment of the allocation. Must be a power of two.\r
alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is\r
returned. If there is not enough memory at the specified alignment remaining to satisfy the\r
request, then NULL is returned.\r
+\r
If Alignment is not a power of two and Alignment is not zero, then ASSERT().\r
+ If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, then ASSERT().\r
\r
@param Pages The number of 4 KB pages to allocate.\r
@param Alignment The requested alignment of the allocation. Must be a power of two.\r
alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is\r
returned. If there is not enough memory at the specified alignment remaining to satisfy the\r
request, then NULL is returned.\r
+\r
If Alignment is not a power of two and Alignment is not zero, then ASSERT().\r
+ If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, then ASSERT().\r
\r
@param Pages The number of 4 KB pages to allocate.\r
@param Alignment The requested alignment of the allocation. Must be a power of two.\r
\r
Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer. Buffer\r
must have been allocated on a previous call to the aligned page allocation services of the Memory\r
- Allocation Library.\r
+ Allocation Library. If it is not possible to free allocated pages, then this function will\r
+ perform no actions.\r
+\r
If Buffer was not allocated with an aligned page allocation function in the Memory Allocation\r
Library, then ASSERT().\r
If Pages is zero, then ASSERT().\r
- \r
+\r
@param Buffer Pointer to the buffer of pages to free.\r
@param Pages The number of 4 KB pages to free.\r
\r
);\r
\r
/**\r
- Allocates a buffer of type EfieservedMemoryType.\r
+ Allocates a buffer of type EfiReservedMemoryType.\r
\r
- Allocates the number bytes specified by AllocationSize of type EfieservedMemoryType and returns\r
+ Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType and returns\r
a pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is\r
returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.\r
\r
AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the\r
allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there\r
is not enough memory remaining to satisfy the request, then NULL is returned.\r
+\r
If Buffer is NULL, then ASSERT().\r
- If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). \r
+ If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
\r
@param AllocationSize The number of bytes to allocate and zero.\r
@param Buffer The buffer to copy to the allocated buffer.\r
AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the\r
allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there\r
is not enough memory remaining to satisfy the request, then NULL is returned.\r
+\r
If Buffer is NULL, then ASSERT().\r
- If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). \r
+ If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
\r
@param AllocationSize The number of bytes to allocate and zero.\r
@param Buffer The buffer to copy to the allocated buffer.\r
AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the\r
allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there\r
is not enough memory remaining to satisfy the request, then NULL is returned.\r
+\r
If Buffer is NULL, then ASSERT().\r
- If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). \r
+ If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
\r
@param AllocationSize The number of bytes to allocate and zero.\r
@param Buffer The buffer to copy to the allocated buffer.\r
IN CONST VOID *Buffer\r
);\r
\r
+/**\r
+ Reallocates a buffer of type EfiBootServicesData.\r
+\r
+ Allocates and zeros the number bytes specified by NewSize from memory of type\r
+ EfiBootServicesData. If OldBuffer is not NULL, then the smaller of OldSize and\r
+ NewSize bytes are copied from OldBuffer to the newly allocated buffer, and\r
+ OldBuffer is freed. A pointer to the newly allocated buffer is returned.\r
+ If NewSize is 0, then a valid buffer of 0 size is returned. If there is not\r
+ enough memory remaining to satisfy the request, then NULL is returned.\r
+\r
+ If the allocation of the new buffer is successful and the smaller of NewSize and OldSize\r
+ is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().\r
+\r
+ @param OldSize The size, in bytes, of OldBuffer.\r
+ @param NewSize The size, in bytes, of the buffer to reallocate.\r
+ @param OldBuffer The buffer to copy to the allocated buffer. This is an optional\r
+ parameter that may be NULL.\r
+\r
+ @return A pointer to the allocated buffer or NULL if allocation fails.\r
+\r
+**/\r
+VOID *\r
+EFIAPI\r
+ReallocatePool (\r
+ IN UINTN OldSize,\r
+ IN UINTN NewSize,\r
+ IN VOID *OldBuffer OPTIONAL\r
+ );\r
+\r
+/**\r
+ Reallocates a buffer of type EfiRuntimeServicesData.\r
+\r
+ Allocates and zeros the number bytes specified by NewSize from memory of type\r
+ EfiRuntimeServicesData. If OldBuffer is not NULL, then the smaller of OldSize and\r
+ NewSize bytes are copied from OldBuffer to the newly allocated buffer, and\r
+ OldBuffer is freed. A pointer to the newly allocated buffer is returned.\r
+ If NewSize is 0, then a valid buffer of 0 size is returned. If there is not\r
+ enough memory remaining to satisfy the request, then NULL is returned.\r
+\r
+ If the allocation of the new buffer is successful and the smaller of NewSize and OldSize\r
+ is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().\r
+\r
+ @param OldSize The size, in bytes, of OldBuffer.\r
+ @param NewSize The size, in bytes, of the buffer to reallocate.\r
+ @param OldBuffer The buffer to copy to the allocated buffer. This is an optional\r
+ parameter that may be NULL.\r
+\r
+ @return A pointer to the allocated buffer or NULL if allocation fails.\r
+\r
+**/\r
+VOID *\r
+EFIAPI\r
+ReallocateRuntimePool (\r
+ IN UINTN OldSize,\r
+ IN UINTN NewSize,\r
+ IN VOID *OldBuffer OPTIONAL\r
+ );\r
+\r
+/**\r
+ Reallocates a buffer of type EfiReservedMemoryType.\r
+\r
+ Allocates and zeros the number bytes specified by NewSize from memory of type\r
+ EfiReservedMemoryType. If OldBuffer is not NULL, then the smaller of OldSize and\r
+ NewSize bytes are copied from OldBuffer to the newly allocated buffer, and\r
+ OldBuffer is freed. A pointer to the newly allocated buffer is returned.\r
+ If NewSize is 0, then a valid buffer of 0 size is returned. If there is not\r
+ enough memory remaining to satisfy the request, then NULL is returned.\r
+\r
+ If the allocation of the new buffer is successful and the smaller of NewSize and OldSize\r
+ is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().\r
+\r
+ @param OldSize The size, in bytes, of OldBuffer.\r
+ @param NewSize The size, in bytes, of the buffer to reallocate.\r
+ @param OldBuffer The buffer to copy to the allocated buffer. This is an optional\r
+ parameter that may be NULL.\r
+\r
+ @return A pointer to the allocated buffer or NULL if allocation fails.\r
+\r
+**/\r
+VOID *\r
+EFIAPI\r
+ReallocateReservedPool (\r
+ IN UINTN OldSize,\r
+ IN UINTN NewSize,\r
+ IN VOID *OldBuffer OPTIONAL\r
+ );\r
+\r
/**\r
Frees a buffer that was previously allocated with one of the pool allocation functions in the\r
Memory Allocation Library.\r
\r
Frees the buffer specified by Buffer. Buffer must have been allocated on a previous call to the\r
- pool allocation services of the Memory Allocation Library.\r
+ pool allocation services of the Memory Allocation Library. If it is not possible to free pool\r
+ resources, then this function will perform no actions.\r
+\r
If Buffer was not allocated with a pool allocation function in the Memory Allocation Library,\r
then ASSERT().\r
\r
VOID\r
EFIAPI\r
FreePool (\r
- IN VOID *Buffer\r
+ IN VOID *Buffer\r
);\r
\r
#endif\r
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