2 Support routines for memory allocation routines based
3 on boot services for Dxe phase drivers.
5 Copyright (c) 2006 - 2008, Intel Corporation<BR>
6 All rights reserved. This program and the accompanying materials
7 are licensed and made available under the terms and conditions of the BSD License
8 which accompanies this distribution. The full text of the license may be found at
9 http://opensource.org/licenses/bsd-license.php
11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
20 #include <Library/MemoryAllocationLib.h>
21 #include <Library/UefiBootServicesTableLib.h>
22 #include <Library/BaseMemoryLib.h>
23 #include <Library/DebugLib.h>
26 Allocates one or more 4KB pages of a certain memory type.
28 Allocates the number of 4KB pages of a certain memory type and returns a pointer to the allocated
29 buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL is returned.
30 If there is not enough memory remaining to satisfy the request, then NULL is returned.
32 @param MemoryType The type of memory to allocate.
33 @param Pages The number of 4 KB pages to allocate.
35 @return A pointer to the allocated buffer or NULL if allocation fails.
39 InternalAllocatePages (
40 IN EFI_MEMORY_TYPE MemoryType
,
45 EFI_PHYSICAL_ADDRESS Memory
;
51 Status
= gBS
->AllocatePages (AllocateAnyPages
, MemoryType
, Pages
, &Memory
);
52 if (EFI_ERROR (Status
)) {
55 return (VOID
*) (UINTN
) Memory
;
59 Allocates one or more 4KB pages of type EfiBootServicesData.
61 Allocates the number of 4KB pages of type EfiBootServicesData and returns a pointer to the
62 allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL
63 is returned. If there is not enough memory remaining to satisfy the request, then NULL is
66 @param Pages The number of 4 KB pages to allocate.
68 @return A pointer to the allocated buffer or NULL if allocation fails.
77 return InternalAllocatePages (EfiBootServicesData
, Pages
);
81 Allocates one or more 4KB pages of type EfiRuntimeServicesData.
83 Allocates the number of 4KB pages of type EfiRuntimeServicesData and returns a pointer to the
84 allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL
85 is returned. If there is not enough memory remaining to satisfy the request, then NULL is
88 @param Pages The number of 4 KB pages to allocate.
90 @return A pointer to the allocated buffer or NULL if allocation fails.
95 AllocateRuntimePages (
99 return InternalAllocatePages (EfiRuntimeServicesData
, Pages
);
103 Allocates one or more 4KB pages of type EfiReservedMemoryType.
105 Allocates the number of 4KB pages of type EfiReservedMemoryType and returns a pointer to the
106 allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL
107 is returned. If there is not enough memory remaining to satisfy the request, then NULL is
110 @param Pages The number of 4 KB pages to allocate.
112 @return A pointer to the allocated buffer or NULL if allocation fails.
117 AllocateReservedPages (
121 return InternalAllocatePages (EfiReservedMemoryType
, Pages
);
125 Frees one or more 4KB pages that were previously allocated with one of the page allocation
126 functions in the Memory Allocation Library.
128 Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer. Buffer
129 must have been allocated on a previous call to the page allocation services of the Memory
132 If Buffer was not allocated with a page allocation function in the Memory Allocation Library,
134 If Pages is zero, then ASSERT().
136 @param Buffer Pointer to the buffer of pages to free.
137 @param Pages The number of 4 KB pages to free.
150 Status
= gBS
->FreePages ((EFI_PHYSICAL_ADDRESS
) (UINTN
) Buffer
, Pages
);
151 ASSERT_EFI_ERROR (Status
);
155 Allocates one or more 4KB pages of a certain memory type at a specified alignment.
157 Allocates the number of 4KB pages specified by Pages of a certain memory type with an alignment
158 specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is returned.
159 If there is not enough memory at the specified alignment remaining to satisfy the request, then
161 If Alignment is not a power of two and Alignment is not zero, then ASSERT().
163 @param MemoryType The type of memory to allocate.
164 @param Pages The number of 4 KB pages to allocate.
165 @param Alignment The requested alignment of the allocation. Must be a power of two.
166 If Alignment is zero, then byte alignment is used.
168 @return A pointer to the allocated buffer or NULL if allocation fails.
172 InternalAllocateAlignedPages (
173 IN EFI_MEMORY_TYPE MemoryType
,
179 EFI_PHYSICAL_ADDRESS Memory
;
182 UINTN UnalignedPages
;
186 // Alignment must be a power of two or zero.
188 ASSERT ((Alignment
& (Alignment
- 1)) == 0);
193 if (Alignment
> EFI_PAGE_SIZE
) {
195 // Caculate the total number of pages since alignment is larger than page size.
197 AlignmentMask
= Alignment
- 1;
198 RealPages
= Pages
+ EFI_SIZE_TO_PAGES (Alignment
);
200 // Make sure that Pages plus EFI_SIZE_TO_PAGES (Alignment) does not overflow.
202 ASSERT (RealPages
> Pages
);
204 Status
= gBS
->AllocatePages (AllocateAnyPages
, MemoryType
, RealPages
, &Memory
);
205 if (EFI_ERROR (Status
)) {
208 AlignedMemory
= ((UINTN
) Memory
+ AlignmentMask
) & ~AlignmentMask
;
209 UnalignedPages
= EFI_SIZE_TO_PAGES (AlignedMemory
- (UINTN
) Memory
);
210 if (UnalignedPages
> 0) {
212 // Free first unaligned page(s).
214 Status
= gBS
->FreePages (Memory
, UnalignedPages
);
215 ASSERT_EFI_ERROR (Status
);
217 Memory
= (EFI_PHYSICAL_ADDRESS
) (AlignedMemory
+ EFI_PAGES_TO_SIZE (Pages
));
218 UnalignedPages
= RealPages
- Pages
- UnalignedPages
;
219 if (UnalignedPages
> 0) {
221 // Free last unaligned page(s).
223 Status
= gBS
->FreePages (Memory
, UnalignedPages
);
224 ASSERT_EFI_ERROR (Status
);
228 // Do not over-allocate pages in this case.
230 Status
= gBS
->AllocatePages (AllocateAnyPages
, MemoryType
, Pages
, &Memory
);
231 if (EFI_ERROR (Status
)) {
234 AlignedMemory
= (UINTN
) Memory
;
236 return (VOID
*) AlignedMemory
;
240 Allocates one or more 4KB pages of type EfiBootServicesData at a specified alignment.
242 Allocates the number of 4KB pages specified by Pages of type EfiBootServicesData with an
243 alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is
244 returned. If there is not enough memory at the specified alignment remaining to satisfy the
245 request, then NULL is returned.
247 If Alignment is not a power of two and Alignment is not zero, then ASSERT().
249 @param Pages The number of 4 KB pages to allocate.
250 @param Alignment The requested alignment of the allocation. Must be a power of two.
251 If Alignment is zero, then byte alignment is used.
253 @return A pointer to the allocated buffer or NULL if allocation fails.
258 AllocateAlignedPages (
263 return InternalAllocateAlignedPages (EfiBootServicesData
, Pages
, Alignment
);
267 Allocates one or more 4KB pages of type EfiRuntimeServicesData at a specified alignment.
269 Allocates the number of 4KB pages specified by Pages of type EfiRuntimeServicesData with an
270 alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is
271 returned. If there is not enough memory at the specified alignment remaining to satisfy the
272 request, then NULL is returned.
274 If Alignment is not a power of two and Alignment is not zero, then ASSERT().
276 @param Pages The number of 4 KB pages to allocate.
277 @param Alignment The requested alignment of the allocation. Must be a power of two.
278 If Alignment is zero, then byte alignment is used.
280 @return A pointer to the allocated buffer or NULL if allocation fails.
285 AllocateAlignedRuntimePages (
290 return InternalAllocateAlignedPages (EfiRuntimeServicesData
, Pages
, Alignment
);
294 Allocates one or more 4KB pages of type EfiReservedMemoryType at a specified alignment.
296 Allocates the number of 4KB pages specified by Pages of type EfiReservedMemoryType with an
297 alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is
298 returned. If there is not enough memory at the specified alignment remaining to satisfy the
299 request, then NULL is returned.
301 If Alignment is not a power of two and Alignment is not zero, then ASSERT().
303 @param Pages The number of 4 KB pages to allocate.
304 @param Alignment The requested alignment of the allocation. Must be a power of two.
305 If Alignment is zero, then byte alignment is used.
307 @return A pointer to the allocated buffer or NULL if allocation fails.
312 AllocateAlignedReservedPages (
317 return InternalAllocateAlignedPages (EfiReservedMemoryType
, Pages
, Alignment
);
321 Frees one or more 4KB pages that were previously allocated with one of the aligned page
322 allocation functions in the Memory Allocation Library.
324 Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer. Buffer
325 must have been allocated on a previous call to the aligned page allocation services of the Memory
328 If Buffer was not allocated with an aligned page allocation function in the Memory Allocation
329 Library, then ASSERT().
330 If Pages is zero, then ASSERT().
332 @param Buffer Pointer to the buffer of pages to free.
333 @param Pages The number of 4 KB pages to free.
346 Status
= gBS
->FreePages ((EFI_PHYSICAL_ADDRESS
) (UINTN
) Buffer
, Pages
);
347 ASSERT_EFI_ERROR (Status
);
351 Allocates a buffer of a certain pool type.
353 Allocates the number bytes specified by AllocationSize of a certain pool type and returns a
354 pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is
355 returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.
357 @param MemoryType The type of memory to allocate.
358 @param AllocationSize The number of bytes to allocate.
360 @return A pointer to the allocated buffer or NULL if allocation fails.
364 InternalAllocatePool (
365 IN EFI_MEMORY_TYPE MemoryType
,
366 IN UINTN AllocationSize
372 Status
= gBS
->AllocatePool (MemoryType
, AllocationSize
, &Memory
);
373 if (EFI_ERROR (Status
)) {
380 Allocates a buffer of type EfiBootServicesData.
382 Allocates the number bytes specified by AllocationSize of type EfiBootServicesData and returns a
383 pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is
384 returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.
386 @param AllocationSize The number of bytes to allocate.
388 @return A pointer to the allocated buffer or NULL if allocation fails.
394 IN UINTN AllocationSize
397 return InternalAllocatePool (EfiBootServicesData
, AllocationSize
);
401 Allocates a buffer of type EfiRuntimeServicesData.
403 Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData and returns
404 a pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is
405 returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.
407 @param AllocationSize The number of bytes to allocate.
409 @return A pointer to the allocated buffer or NULL if allocation fails.
414 AllocateRuntimePool (
415 IN UINTN AllocationSize
418 return InternalAllocatePool (EfiRuntimeServicesData
, AllocationSize
);
422 Allocates a buffer of type EfiReservedMemoryType.
424 Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType and returns
425 a pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is
426 returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.
428 @param AllocationSize The number of bytes to allocate.
430 @return A pointer to the allocated buffer or NULL if allocation fails.
435 AllocateReservedPool (
436 IN UINTN AllocationSize
439 return InternalAllocatePool (EfiReservedMemoryType
, AllocationSize
);
443 Allocates and zeros a buffer of a certian pool type.
445 Allocates the number bytes specified by AllocationSize of a certian pool type, clears the buffer
446 with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a valid
447 buffer of 0 size is returned. If there is not enough memory remaining to satisfy the request,
448 then NULL is returned.
450 @param PoolType The type of memory to allocate.
451 @param AllocationSize The number of bytes to allocate and zero.
453 @return A pointer to the allocated buffer or NULL if allocation fails.
457 InternalAllocateZeroPool (
458 IN EFI_MEMORY_TYPE PoolType
,
459 IN UINTN AllocationSize
464 Memory
= InternalAllocatePool (PoolType
, AllocationSize
);
465 if (Memory
!= NULL
) {
466 Memory
= ZeroMem (Memory
, AllocationSize
);
472 Allocates and zeros a buffer of type EfiBootServicesData.
474 Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, clears the
475 buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a
476 valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the
477 request, then NULL is returned.
479 @param AllocationSize The number of bytes to allocate and zero.
481 @return A pointer to the allocated buffer or NULL if allocation fails.
487 IN UINTN AllocationSize
490 return InternalAllocateZeroPool (EfiBootServicesData
, AllocationSize
);
494 Allocates and zeros a buffer of type EfiRuntimeServicesData.
496 Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData, clears the
497 buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a
498 valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the
499 request, then NULL is returned.
501 @param AllocationSize The number of bytes to allocate and zero.
503 @return A pointer to the allocated buffer or NULL if allocation fails.
508 AllocateRuntimeZeroPool (
509 IN UINTN AllocationSize
512 return InternalAllocateZeroPool (EfiRuntimeServicesData
, AllocationSize
);
516 Allocates and zeros a buffer of type EfiReservedMemoryType.
518 Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType, clears the
519 buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a
520 valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the
521 request, then NULL is returned.
523 @param AllocationSize The number of bytes to allocate and zero.
525 @return A pointer to the allocated buffer or NULL if allocation fails.
530 AllocateReservedZeroPool (
531 IN UINTN AllocationSize
534 return InternalAllocateZeroPool (EfiReservedMemoryType
, AllocationSize
);
538 Copies a buffer to an allocated buffer of a certian pool type.
540 Allocates the number bytes specified by AllocationSize of a certian pool type, copies
541 AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
542 allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there
543 is not enough memory remaining to satisfy the request, then NULL is returned.
544 If Buffer is NULL, then ASSERT().
545 If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
547 @param PoolType The type of pool to allocate.
548 @param AllocationSize The number of bytes to allocate and zero.
549 @param Buffer The buffer to copy to the allocated buffer.
551 @return A pointer to the allocated buffer or NULL if allocation fails.
555 InternalAllocateCopyPool (
556 IN EFI_MEMORY_TYPE PoolType
,
557 IN UINTN AllocationSize
,
558 IN CONST VOID
*Buffer
563 ASSERT (Buffer
!= NULL
);
564 ASSERT (AllocationSize
<= (MAX_ADDRESS
- (UINTN
) Buffer
+ 1));
566 Memory
= InternalAllocatePool (PoolType
, AllocationSize
);
567 if (Memory
!= NULL
) {
568 Memory
= CopyMem (Memory
, Buffer
, AllocationSize
);
574 Copies a buffer to an allocated buffer of type EfiBootServicesData.
576 Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, copies
577 AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
578 allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there
579 is not enough memory remaining to satisfy the request, then NULL is returned.
580 If Buffer is NULL, then ASSERT().
581 If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
583 @param AllocationSize The number of bytes to allocate and zero.
584 @param Buffer The buffer to copy to the allocated buffer.
586 @return A pointer to the allocated buffer or NULL if allocation fails.
592 IN UINTN AllocationSize
,
593 IN CONST VOID
*Buffer
596 return InternalAllocateCopyPool (EfiBootServicesData
, AllocationSize
, Buffer
);
600 Copies a buffer to an allocated buffer of type EfiRuntimeServicesData.
602 Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData, copies
603 AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
604 allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there
605 is not enough memory remaining to satisfy the request, then NULL is returned.
607 If Buffer is NULL, then ASSERT().
608 If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
610 @param AllocationSize The number of bytes to allocate and zero.
611 @param Buffer The buffer to copy to the allocated buffer.
613 @return A pointer to the allocated buffer or NULL if allocation fails.
618 AllocateRuntimeCopyPool (
619 IN UINTN AllocationSize
,
620 IN CONST VOID
*Buffer
623 return InternalAllocateCopyPool (EfiRuntimeServicesData
, AllocationSize
, Buffer
);
627 Copies a buffer to an allocated buffer of type EfiReservedMemoryType.
629 Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType, copies
630 AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
631 allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there
632 is not enough memory remaining to satisfy the request, then NULL is returned.
634 If Buffer is NULL, then ASSERT().
635 If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
637 @param AllocationSize The number of bytes to allocate and zero.
638 @param Buffer The buffer to copy to the allocated buffer.
640 @return A pointer to the allocated buffer or NULL if allocation fails.
645 AllocateReservedCopyPool (
646 IN UINTN AllocationSize
,
647 IN CONST VOID
*Buffer
650 return InternalAllocateCopyPool (EfiReservedMemoryType
, AllocationSize
, Buffer
);
654 Reallocates a buffer of a specified memory type.
656 Allocates and zeros the number bytes specified by NewSize from memory of the type
657 specified by PoolType. If OldBuffer is not NULL, then the smaller of OldSize and
658 NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
659 OldBuffer is freed. A pointer to the newly allocated buffer is returned.
660 If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
661 enough memory remaining to satisfy the request, then NULL is returned.
663 If OldBuffer is NULL, then ASSERT().
664 If NewSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
665 If OldSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
667 @param PoolType The type of pool to allocate.
668 @param OldSize The size, in bytes, of OldBuffer.
669 @param NewSize The size, in bytes, of the buffer to reallocate.
670 @param OldBuffer The buffer to copy to the allocated buffer. This is an optional
671 parameter that may be NULL.
673 @return A pointer to the allocated buffer or NULL if allocation fails.
678 InternalReallocatePool (
679 IN EFI_MEMORY_TYPE PoolType
,
682 IN VOID
*OldBuffer OPTIONAL
687 NewBuffer
= AllocateZeroPool (NewSize
);
688 if (NewBuffer
!= NULL
&& OldBuffer
!= NULL
) {
689 CopyMem (NewBuffer
, OldBuffer
, MIN (OldSize
, NewSize
));
690 FreePool (OldBuffer
);
696 Reallocates a buffer of type EfiBootServicesData.
698 Allocates and zeros the number bytes specified by NewSize from memory of type
699 EfiBootServicesData. If OldBuffer is not NULL, then the smaller of OldSize and
700 NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
701 OldBuffer is freed. A pointer to the newly allocated buffer is returned.
702 If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
703 enough memory remaining to satisfy the request, then NULL is returned.
705 If OldBuffer is NULL, then ASSERT().
706 If NewSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
707 If OldSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
709 @param OldSize The size, in bytes, of OldBuffer.
710 @param NewSize The size, in bytes, of the buffer to reallocate.
711 @param OldBuffer The buffer to copy to the allocated buffer. This is an optional
712 parameter that may be NULL.
714 @return A pointer to the allocated buffer or NULL if allocation fails.
722 IN VOID
*OldBuffer OPTIONAL
725 return InternalReallocatePool (EfiBootServicesData
, OldSize
, NewSize
, OldBuffer
);
729 Reallocates a buffer of type EfiRuntimeServicesData.
731 Allocates and zeros the number bytes specified by NewSize from memory of type
732 EfiRuntimeServicesData. If OldBuffer is not NULL, then the smaller of OldSize and
733 NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
734 OldBuffer is freed. A pointer to the newly allocated buffer is returned.
735 If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
736 enough memory remaining to satisfy the request, then NULL is returned.
738 If OldBuffer is NULL, then ASSERT().
739 If NewSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
740 If OldSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
742 @param OldSize The size, in bytes, of OldBuffer.
743 @param NewSize The size, in bytes, of the buffer to reallocate.
744 @param OldBuffer The buffer to copy to the allocated buffer. This is an optional
745 parameter that may be NULL.
747 @return A pointer to the allocated buffer or NULL if allocation fails.
752 ReallocateRuntimePool (
755 IN VOID
*OldBuffer OPTIONAL
758 return InternalReallocatePool (EfiRuntimeServicesData
, OldSize
, NewSize
, OldBuffer
);
762 Reallocates a buffer of type EfiReservedMemoryType.
764 Allocates and zeros the number bytes specified by NewSize from memory of type
765 EfiReservedMemoryType. If OldBuffer is not NULL, then the smaller of OldSize and
766 NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
767 OldBuffer is freed. A pointer to the newly allocated buffer is returned.
768 If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
769 enough memory remaining to satisfy the request, then NULL is returned.
771 If OldBuffer is NULL, then ASSERT().
772 If NewSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
773 If OldSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
775 @param OldSize The size, in bytes, of OldBuffer.
776 @param NewSize The size, in bytes, of the buffer to reallocate.
777 @param OldBuffer The buffer to copy to the allocated buffer. This is an optional
778 parameter that may be NULL.
780 @return A pointer to the allocated buffer or NULL if allocation fails.
785 ReallocateReservedPool (
788 IN VOID
*OldBuffer OPTIONAL
791 return InternalReallocatePool (EfiReservedMemoryType
, OldSize
, NewSize
, OldBuffer
);
795 Frees a buffer that was previously allocated with one of the pool allocation functions in the
796 Memory Allocation Library.
798 Frees the buffer specified by Buffer. Buffer must have been allocated on a previous call to the
799 pool allocation services of the Memory Allocation Library.
801 If Buffer was not allocated with a pool allocation function in the Memory Allocation Library,
804 @param Buffer Pointer to the buffer to free.
815 Status
= gBS
->FreePool (Buffer
);
816 ASSERT_EFI_ERROR (Status
);