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| author | Jeff Brasen via groups.io <jbrasen=nvidia.com@groups.io> | 2023-12-28 12:47:06 -0800 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2024-01-03 13:43:18 +0000 |
| commit | 0d39caefb95e0079ec1eaaadbd06f07c4f0b1901 (patch) | |
| tree | e9f7b2d1f9c24f90c6f22b131905efddf90e66c1 /EmbeddedPkg | |
| parent | d7d4f09ff815794761f84d06e307001afe6376c4 (diff) | |
| download | edk2-0d39caefb95e0079ec1eaaadbd06f07c4f0b1901.tar.gz edk2-0d39caefb95e0079ec1eaaadbd06f07c4f0b1901.tar.bz2 edk2-0d39caefb95e0079ec1eaaadbd06f07c4f0b1901.zip | |
EmbeddedPkg/PrePiMemoryAllocationLib: Add ReallocatePool
Add implementation of ReallocatePool which is defined in the
MemoryAllocationLib header file to allow components to not
need special handling for PrePi module types.
Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
Diffstat (limited to 'EmbeddedPkg')
| -rw-r--r-- | EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c b/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c index 08a0add340..fa81cc9d59 100644 --- a/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c +++ b/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c @@ -269,3 +269,60 @@ FreePool ( {
// Not implemented yet
}
+
+/**
+ Reallocates a buffer of type EfiBootServicesData.
+
+ Allocates and zeros the number bytes specified by NewSize from memory of type
+ EfiBootServicesData. If OldBuffer is not NULL, then the smaller of OldSize and
+ NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
+ OldBuffer is freed. A pointer to the newly allocated buffer is returned.
+ If NewSize 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.
+
+ If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
+ is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
+
+ @param OldSize The size, in bytes, of OldBuffer.
+ @param NewSize The size, in bytes, of the buffer to reallocate.
+ @param OldBuffer The buffer to copy to the allocated buffer. This is an optional
+ parameter that may be NULL.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+ReallocatePool (
+ IN UINTN OldSize,
+ IN UINTN NewSize,
+ IN VOID *OldBuffer OPTIONAL
+ )
+{
+ VOID *NewBuffer;
+
+ // Validate the OldBuffer is HobAllocated.
+ DEBUG_CODE_BEGIN ();
+ EFI_HOB_HANDOFF_INFO_TABLE *HandOffHob;
+
+ if (OldBuffer != NULL) {
+ HandOffHob = GetHobList ();
+ ASSERT (((EFI_PHYSICAL_ADDRESS)(UINTN)OldBuffer >= HandOffHob->EfiMemoryBottom));
+ ASSERT (((EFI_PHYSICAL_ADDRESS)(UINTN)(OldBuffer + OldSize) <= HandOffHob->EfiFreeMemoryBottom));
+ }
+
+ DEBUG_CODE_END ();
+
+ // If new buffer would be smaller just return old buffer as FreePool isn't supported.
+ if ((OldBuffer != NULL) && (OldSize >= NewSize)) {
+ return OldBuffer;
+ }
+
+ NewBuffer = AllocateZeroPool (NewSize);
+ if ((NewBuffer != NULL) && (OldBuffer != NULL)) {
+ CopyMem (NewBuffer, OldBuffer, MIN (OldSize, NewSize));
+ FreePool (OldBuffer);
+ }
+
+ return NewBuffer;
+}
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