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488 lines
17 KiB
C
488 lines
17 KiB
C
/** @file
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Provides services to allocate and free memory buffers of various memory types and alignments.
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The Memory Allocation Library abstracts various common 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 __MEMORY_ALLOCATION_LIB_H__
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#define __MEMORY_ALLOCATION_LIB_H__
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/**
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Allocates one or more 4KB pages of type EfiBootServicesData.
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Allocates the number of 4KB pages of type EfiBootServicesData and returns a pointer to the
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allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL
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is returned. If there is not enough memory remaining to satisfy the request, then NULL is
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returned.
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@param 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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AllocatePages (
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IN UINTN Pages
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);
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/**
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Allocates one or more 4KB pages of type EfiRuntimeServicesData.
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Allocates the number of 4KB pages of type EfiRuntimeServicesData and returns a pointer to the
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allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL
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is returned. If there is not enough memory remaining to satisfy the request, then NULL is
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returned.
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@param 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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AllocateRuntimePages (
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IN UINTN Pages
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);
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/**
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Allocates one or more 4KB pages of type EfiReservedMemoryType.
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Allocates the number of 4KB pages of type EfiReservedMemoryType and returns a pointer to the
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allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL
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is returned. If there is not enough memory remaining to satisfy the request, then NULL is
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returned.
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@param 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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AllocateReservedPages (
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IN UINTN Pages
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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. Buffer
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must have been allocated on a previous call to the page allocation services of the Memory
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Allocation Library. If it is not possible to free allocated pages, then this function will
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perform no actions.
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If Buffer was not allocated with a page allocation function in the Memory Allocation Library,
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then ASSERT().
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If Pages is zero, then ASSERT().
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@param Buffer Pointer to the buffer of pages to free.
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@param Pages The number of 4 KB pages to free.
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**/
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VOID
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EFIAPI
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FreePages (
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IN VOID *Buffer,
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IN UINTN Pages
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);
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/**
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Allocates one or more 4KB pages of type EfiBootServicesData at a specified alignment.
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Allocates the number of 4KB pages specified by Pages of type EfiBootServicesData with an
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alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is
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returned. If there is not enough memory at the specified alignment remaining to satisfy the
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request, then NULL is returned.
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If Alignment is not a power of two and Alignment is not zero, then ASSERT().
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If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, then ASSERT().
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@param Pages The number of 4 KB pages to allocate.
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@param Alignment The requested alignment of the allocation. Must be a power of two.
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If Alignment is zero, then byte alignment is used.
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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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AllocateAlignedPages (
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IN UINTN Pages,
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IN UINTN Alignment
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);
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/**
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Allocates one or more 4KB pages of type EfiRuntimeServicesData at a specified alignment.
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Allocates the number of 4KB pages specified by Pages of type EfiRuntimeServicesData with an
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alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is
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returned. If there is not enough memory at the specified alignment remaining to satisfy the
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request, then NULL is returned.
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If Alignment is not a power of two and Alignment is not zero, then ASSERT().
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If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, then ASSERT().
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@param Pages The number of 4 KB pages to allocate.
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@param Alignment The requested alignment of the allocation. Must be a power of two.
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If Alignment is zero, then byte alignment is used.
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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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AllocateAlignedRuntimePages (
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IN UINTN Pages,
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IN UINTN Alignment
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);
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/**
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Allocates one or more 4KB pages of type EfiReservedMemoryType at a specified alignment.
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Allocates the number of 4KB pages specified by Pages of type EfiReservedMemoryType with an
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alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is
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returned. If there is not enough memory at the specified alignment remaining to satisfy the
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request, then NULL is returned.
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If Alignment is not a power of two and Alignment is not zero, then ASSERT().
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If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, then ASSERT().
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@param Pages The number of 4 KB pages to allocate.
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@param Alignment The requested alignment of the allocation. Must be a power of two.
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If Alignment is zero, then byte alignment is used.
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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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AllocateAlignedReservedPages (
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IN UINTN Pages,
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IN UINTN Alignment
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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 aligned page
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allocation 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. Buffer
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must have been allocated on a previous call to the aligned page allocation services of the Memory
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Allocation Library. If it is not possible to free allocated pages, then this function will
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perform no actions.
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If Buffer was not allocated with an aligned 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 Buffer Pointer to the buffer of pages to free.
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@param Pages The number of 4 KB pages to free.
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**/
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VOID
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EFIAPI
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FreeAlignedPages (
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IN VOID *Buffer,
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IN UINTN Pages
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);
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/**
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Allocates a buffer of type EfiBootServicesData.
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Allocates the number bytes specified by AllocationSize of type EfiBootServicesData 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 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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AllocatePool (
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IN UINTN AllocationSize
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);
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/**
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Allocates a buffer of type EfiRuntimeServicesData.
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Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData and returns
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a 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 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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AllocateRuntimePool (
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IN UINTN AllocationSize
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);
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/**
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Allocates a buffer of type EfiReservedMemoryType.
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Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType and returns
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a 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 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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AllocateReservedPool (
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IN UINTN AllocationSize
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);
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/**
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Allocates and zeros a buffer of type EfiBootServicesData.
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Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, clears the
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buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a
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valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the
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request, then NULL is returned.
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@param AllocationSize The number of bytes to allocate and zero.
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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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AllocateZeroPool(
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IN UINTN AllocationSize
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);
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/**
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Allocates and zeros a buffer of type EfiRuntimeServicesData.
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Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData, clears the
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buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a
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valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the
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request, then NULL is returned.
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@param AllocationSize The number of bytes to allocate and zero.
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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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AllocateRuntimeZeroPool (
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IN UINTN AllocationSize
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);
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/**
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Allocates and zeros a buffer of type EfiReservedMemoryType.
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Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType, clears the
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buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a
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valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the
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request, then NULL is returned.
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@param AllocationSize The number of bytes to allocate and zero.
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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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AllocateReservedZeroPool (
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IN UINTN AllocationSize
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);
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/**
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Copies a buffer to an allocated buffer of type EfiBootServicesData.
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Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, copies
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AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
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allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there
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is not enough memory remaining to satisfy the request, then NULL is returned.
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If Buffer is NULL, then ASSERT().
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If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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@param AllocationSize The number of bytes to allocate and zero.
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@param Buffer The buffer to copy to the allocated buffer.
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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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AllocateCopyPool(
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IN UINTN AllocationSize,
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IN CONST VOID *Buffer
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);
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/**
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Copies a buffer to an allocated buffer of type EfiRuntimeServicesData.
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Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData, copies
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AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
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allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there
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is not enough memory remaining to satisfy the request, then NULL is returned.
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If Buffer is NULL, then ASSERT().
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If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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@param AllocationSize The number of bytes to allocate and zero.
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@param Buffer The buffer to copy to the allocated buffer.
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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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AllocateRuntimeCopyPool (
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IN UINTN AllocationSize,
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IN CONST VOID *Buffer
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);
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/**
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Copies a buffer to an allocated buffer of type EfiReservedMemoryType.
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Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType, copies
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AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
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allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there
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is not enough memory remaining to satisfy the request, then NULL is returned.
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If Buffer is NULL, then ASSERT().
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If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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@param AllocationSize The number of bytes to allocate and zero.
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@param Buffer The buffer to copy to the allocated buffer.
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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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AllocateReservedCopyPool (
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IN UINTN AllocationSize,
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IN CONST VOID *Buffer
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);
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/**
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Reallocates a buffer of type EfiBootServicesData.
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Allocates and zeros the number bytes specified by NewSize from memory of type
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EfiBootServicesData. If OldBuffer is not NULL, then the smaller of OldSize and
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NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
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OldBuffer is freed. A pointer to the newly allocated buffer is returned.
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If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
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enough memory remaining to satisfy the request, then NULL is returned.
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If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
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is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
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@param OldSize The size, in bytes, of OldBuffer.
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@param NewSize The size, in bytes, of the buffer to reallocate.
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@param OldBuffer The buffer to copy to the allocated buffer. This is an optional
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parameter that may be NULL.
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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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ReallocatePool (
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IN UINTN OldSize,
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IN UINTN NewSize,
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IN VOID *OldBuffer OPTIONAL
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);
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/**
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Reallocates a buffer of type EfiRuntimeServicesData.
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Allocates and zeros the number bytes specified by NewSize from memory of type
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EfiRuntimeServicesData. If OldBuffer is not NULL, then the smaller of OldSize and
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NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
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OldBuffer is freed. A pointer to the newly allocated buffer is returned.
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If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
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enough memory remaining to satisfy the request, then NULL is returned.
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If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
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is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
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@param OldSize The size, in bytes, of OldBuffer.
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@param NewSize The size, in bytes, of the buffer to reallocate.
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@param OldBuffer The buffer to copy to the allocated buffer. This is an optional
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parameter that may be NULL.
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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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ReallocateRuntimePool (
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IN UINTN OldSize,
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IN UINTN NewSize,
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IN VOID *OldBuffer OPTIONAL
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);
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/**
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Reallocates a buffer of type EfiReservedMemoryType.
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Allocates and zeros the number bytes specified by NewSize from memory of type
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EfiReservedMemoryType. If OldBuffer is not NULL, then the smaller of OldSize and
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NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
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OldBuffer is freed. A pointer to the newly allocated buffer is returned.
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If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
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enough memory remaining to satisfy the request, then NULL is returned.
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If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
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is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
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@param OldSize The size, in bytes, of OldBuffer.
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@param NewSize The size, in bytes, of the buffer to reallocate.
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@param OldBuffer The buffer to copy to the allocated buffer. This is an optional
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parameter that may be NULL.
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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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ReallocateReservedPool (
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IN UINTN OldSize,
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IN UINTN NewSize,
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IN VOID *OldBuffer OPTIONAL
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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 Pointer to the buffer to free.
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**/
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VOID
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EFIAPI
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FreePool(
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IN JCONST VOID *Buffer
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);
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#endif
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