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49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/** @file
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DxeServicesLib memory allocation routines
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Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiDxe.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/DxeServicesLib.h>
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/**
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Allocates one or more 4KB pages of a given type from a memory region that is
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accessible to PEI.
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Allocates the number of 4KB pages of type 'MemoryType' and returns a
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pointer to the allocated buffer. The buffer returned is aligned on a 4KB
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boundary. If Pages is 0, then NULL is returned. If there is not enough
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memory remaining to satisfy the request, then NULL is returned.
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@param[in] MemoryType The memory type to allocate
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@param[in] Pages The number of 4 KB pages 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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AllocatePeiAccessiblePages (
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IN EFI_MEMORY_TYPE MemoryType,
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IN UINTN Pages
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)
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{
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EFI_STATUS Status;
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EFI_PHYSICAL_ADDRESS Memory;
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if (Pages == 0) {
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return NULL;
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}
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Status = gBS->AllocatePages (AllocateAnyPages, MemoryType, Pages, &Memory);
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if (EFI_ERROR (Status)) {
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return NULL;
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}
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return (VOID *)(UINTN)Memory;
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}
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