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/** @file
DxeServicesLib memory allocation routines
Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiDxe.h>
#include <Library/HobLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/DxeServicesLib.h>
/**
Allocates one or more 4KB pages of a given type from a memory region that is
accessible to PEI.
Allocates the number of 4KB pages of type 'MemoryType' and returns a
pointer to the allocated buffer. The buffer returned is aligned on a 4KB
boundary. If Pages is 0, then NULL is returned. If there is not enough
memory remaining to satisfy the request, then NULL is returned.
@param[in] MemoryType The memory type to allocate
@param[in] Pages The number of 4 KB pages to allocate.
@return A pointer to the allocated buffer or NULL if allocation fails.
**/
VOID *
EFIAPI
AllocatePeiAccessiblePages (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages
)
{
EFI_STATUS Status;
EFI_ALLOCATE_TYPE AllocType;
EFI_PHYSICAL_ADDRESS Memory;
EFI_HOB_HANDOFF_INFO_TABLE *PhitHob;
if (Pages == 0) {
return NULL;
}
AllocType = AllocateAnyPages;
//
// A X64 build of DXE may be combined with a 32-bit build of PEI, and so we
// need to check the memory limit set by PEI, and allocate below 4 GB if the
// limit is set to 4 GB or lower.
//
PhitHob = (EFI_HOB_HANDOFF_INFO_TABLE *)GetHobList ();
if (PhitHob->EfiFreeMemoryTop <= MAX_UINT32) {
AllocType = AllocateMaxAddress;
Memory = MAX_UINT32;
}
Status = gBS->AllocatePages (AllocType, MemoryType, Pages, &Memory);
if (EFI_ERROR (Status)) {
return NULL;
}
return (VOID *)(UINTN)Memory;
}
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