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123 lines
4.3 KiB
C
123 lines
4.3 KiB
C
/** @file
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Provides primitives to allocate and free memory buffers of various memory types and alignments.
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The Phase Memory Allocation Library abstracts primitive memory allocation operations. This library
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allows code to be written in a phase-independent manner because the allocation of memory in PEI, DXE,
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and SMM (for example) is done via a different mechanism. Using a common library interface makes it
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much easier to port algorithms from phase to phase.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef __PHASE_MEMORY_ALLOCATION_LIB_H__
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#define __PHASE_MEMORY_ALLOCATION_LIB_H__
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/**
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Allocates one or more 4KB pages of a certain memory type.
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Allocates the number of 4KB pages of a certain memory type and returns a pointer
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to the allocated buffer. The buffer returned is aligned on a 4KB boundary.
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@param Type The type of allocation to perform.
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@param MemoryType The type of memory to allocate.
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@param Pages The number of 4 KB pages to allocate.
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@param Memory The pointer to a physical address. On input, the
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way in which the address is used depends on the
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value of Type.
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@retval EFI_SUCCESS The requested pages were allocated.
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@retval EFI_OUT_OF_RESOURCES The pages could not be allocated.
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@retval EFI_NOT_FOUND The requested pages could not be found.
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**/
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EFI_STATUS
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EFIAPI
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PhaseAllocatePages (
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IN EFI_ALLOCATE_TYPE Type,
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IN EFI_MEMORY_TYPE MemoryType,
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IN UINTN Pages,
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IN OUT EFI_PHYSICAL_ADDRESS *Memory
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);
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/**
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Frees one or more 4KB pages that were previously allocated with one of the page allocation
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functions in the Memory Allocation Library.
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Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer.
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Buffer must have been allocated on a previous call to the page allocation services
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of the Memory Allocation Library. If it is not possible to free allocated pages,
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then this function will perform no actions.
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If Buffer was not allocated with a page allocation function in the Memory Allocation
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Library, then ASSERT().
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If Pages is zero, then ASSERT().
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@param Memory The base physical address of the pages to be freed.
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@param Pages The number of 4 KB pages to free.
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@retval EFI_SUCCESS The requested pages were freed.
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@retval EFI_NOT_FOUND The requested memory pages were not allocated with
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PhaseAllocatePages().
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**/
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EFI_STATUS
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EFIAPI
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PhaseFreePages (
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IN EFI_PHYSICAL_ADDRESS Memory,
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IN UINTN Pages
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);
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/**
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Allocates a buffer of a certain pool type.
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Allocates the number bytes specified by AllocationSize of a certain pool type and returns a
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pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is
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returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.
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@param MemoryType The type of memory to allocate.
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@param AllocationSize The number of bytes 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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PhaseAllocatePool (
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IN EFI_MEMORY_TYPE MemoryType,
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IN UINTN AllocationSize
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);
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/**
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Frees a buffer that was previously allocated with one of the pool allocation functions in the
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Memory Allocation Library.
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Frees the buffer specified by Buffer. Buffer must have been allocated on a previous call to the
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pool allocation services of the Memory Allocation Library. If it is not possible to free pool
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resources, then this function will perform no actions.
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If Buffer was not allocated with a pool allocation function in the Memory Allocation Library,
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then ASSERT().
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@param Buffer The pointer to the buffer to free.
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**/
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VOID
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EFIAPI
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PhaseFreePool (
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IN VOID *Buffer
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);
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///
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/// The memory type to allocate for calls to AllocatePages().
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///
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extern CONST EFI_MEMORY_TYPE gPhaseDefaultDataType;
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///
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/// The memory type to allocate for calls to AllocateCodePages().
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///
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extern CONST EFI_MEMORY_TYPE gPhaseDefaultCodeType;
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#endif
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