EmbeddedPkg/PrePiMemoryAllocationLib: Added AllocateZeroPool()

[mirror_edk2.git] / EmbeddedPkg / Library / PrePiMemoryAllocationLib / MemoryAllocationLib.c

/** @file\r
  Implementation of the 6 PEI Ffs (FV) APIs in library form.\r
\r
  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <PiPei.h>\r
\r
#include <Library/BaseLib.h>\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/PrePiLib.h>\r
#include <Library/DebugLib.h>\r
\r
\r
\r
/**\r
  Allocates one or more 4KB pages of type EfiBootServicesData.\r
\r
  Allocates the number of 4KB pages of MemoryType and returns a pointer to the\r
  allocated buffer.  The buffer returned is aligned on a 4KB boundary.  If Pages is 0, then NULL\r
  is returned.  If there is not enough memory remaining to satisfy the request, then NULL is\r
  returned.\r
\r
  @param  Pages                 The number of 4 KB pages to allocate.\r
\r
  @return A pointer to the allocated buffer or NULL if allocation fails.\r
\r
**/\r
VOID *\r
EFIAPI\r
AllocatePages (\r
  IN UINTN            Pages\r
  )\r
{\r
  EFI_PEI_HOB_POINTERS                    Hob;\r
  EFI_PHYSICAL_ADDRESS                    Offset;\r
\r
  Hob.Raw = GetHobList ();\r
\r
  // Check to see if on 4k boundary\r
  Offset = Hob.HandoffInformationTable->EfiFreeMemoryTop & 0xFFF;\r
  if (Offset != 0) {\r
    // If not aligned, make the allocation aligned.\r
    Hob.HandoffInformationTable->EfiFreeMemoryTop -= Offset;\r
  }\r
\r
  //\r
  // Verify that there is sufficient memory to satisfy the allocation\r
  //\r
  if (Hob.HandoffInformationTable->EfiFreeMemoryTop - ((Pages * EFI_PAGE_SIZE) + sizeof (EFI_HOB_MEMORY_ALLOCATION)) < Hob.HandoffInformationTable->EfiFreeMemoryBottom) {\r
    return 0;\r
  } else {\r
    //\r
    // Update the PHIT to reflect the memory usage\r
    //\r
    Hob.HandoffInformationTable->EfiFreeMemoryTop -= Pages * EFI_PAGE_SIZE;\r
\r
    // This routine used to create a memory allocation HOB a la PEI, but that's not\r
    // necessary for us.\r
\r
    //\r
    // Create a memory allocation HOB.\r
    //\r
    BuildMemoryAllocationHob (\r
        Hob.HandoffInformationTable->EfiFreeMemoryTop,\r
        Pages * EFI_PAGE_SIZE,\r
        EfiBootServicesData\r
        );\r
    return (VOID *)(UINTN)Hob.HandoffInformationTable->EfiFreeMemoryTop;\r
  }\r
}\r
\r
\r
/**\r
  Allocates one or more 4KB pages of type EfiBootServicesData at a specified alignment.\r
\r
  Allocates the number of 4KB pages specified by Pages of type EfiBootServicesData with an\r
  alignment specified by Alignment.  The allocated buffer is returned.  If Pages is 0, then NULL is\r
  returned.  If there is not enough memory at the specified alignment remaining to satisfy the\r
  request, then NULL is returned.\r
  If Alignment is not a power of two and Alignment is not zero, then ASSERT().\r
\r
  @param  Pages                 The number of 4 KB pages to allocate.\r
  @param  Alignment             The requested alignment of the allocation.  Must be a power of two.\r
                                If Alignment is zero, then byte alignment is used.\r
\r
  @return A pointer to the allocated buffer or NULL if allocation fails.\r
\r
**/\r
VOID *\r
EFIAPI\r
AllocateAlignedPages (\r
  IN UINTN  Pages,\r
  IN UINTN  Alignment\r
  )\r
{\r
  VOID    *Memory;\r
  UINTN   AlignmentMask;\r
\r
  //\r
  // Alignment must be a power of two or zero.\r
  //\r
  ASSERT ((Alignment & (Alignment - 1)) == 0);\r
\r
  if (Pages == 0) {\r
    return NULL;\r
  }\r
  //\r
  // Make sure that Pages plus EFI_SIZE_TO_PAGES (Alignment) does not overflow.\r
  //\r
  ASSERT (Pages <= (MAX_ADDRESS - EFI_SIZE_TO_PAGES (Alignment)));\r
  //\r
  // We would rather waste some memory to save PEI code size.\r
  //\r
  Memory = (VOID *)(UINTN)AllocatePages (Pages + EFI_SIZE_TO_PAGES (Alignment));\r
  if (Alignment == 0) {\r
    AlignmentMask = Alignment;\r
  } else {\r
    AlignmentMask = Alignment - 1;\r
  }\r
  return (VOID *) (UINTN) (((UINTN) Memory + AlignmentMask) & ~AlignmentMask);\r
}\r
\r
\r
/**\r
  Frees one or more 4KB pages that were previously allocated with one of the page allocation\r
  functions in the Memory Allocation Library.\r
\r
  Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer.  Buffer\r
  must have been allocated on a previous call to the page allocation services of the Memory\r
  Allocation Library.  If it is not possible to free allocated pages, then this function will\r
  perform no actions.\r
\r
  If Buffer was not allocated with a page allocation function in the Memory Allocation Library,\r
  then ASSERT().\r
  If Pages is zero, then ASSERT().\r
\r
  @param  Buffer                Pointer to the buffer of pages to free.\r
  @param  Pages                 The number of 4 KB pages to free.\r
\r
**/\r
VOID\r
EFIAPI\r
FreePages (\r
  IN VOID   *Buffer,\r
  IN UINTN  Pages\r
  )\r
{\r
  // For now, we do not support the ability to free pages in the PrePei Memory Allocator.\r
  // The allocated memory is lost.\r
}\r
\r
/**\r
  Allocates a buffer of type EfiBootServicesData.\r
\r
  Allocates the number bytes specified by AllocationSize of type EfiBootServicesData and returns a\r
  pointer to the allocated buffer.  If AllocationSize is 0, then a valid buffer of 0 size is\r
  returned.  If there is not enough memory remaining to satisfy the request, then NULL is returned.\r
\r
  @param  AllocationSize        The number of bytes to allocate.\r
\r
  @return A pointer to the allocated buffer or NULL if allocation fails.\r
\r
**/\r
VOID *\r
EFIAPI\r
AllocatePool (\r
  IN UINTN  AllocationSize\r
  )\r
{\r
  EFI_HOB_MEMORY_POOL      *Hob;\r
\r
  Hob = GetHobList ();\r
\r
\r
  //\r
  // Verify that there is sufficient memory to satisfy the allocation\r
  //\r
  if (AllocationSize > 0x10000) {\r
    // Please call AllcoatePages for big allocations\r
    return 0;\r
  } else {\r
\r
    Hob = (EFI_HOB_MEMORY_POOL *)CreateHob (EFI_HOB_TYPE_MEMORY_POOL, (UINT16)(sizeof (EFI_HOB_TYPE_MEMORY_POOL) + AllocationSize));\r
    return (VOID *)(Hob + 1);\r
  }\r
}\r
\r
/**\r
  Allocates and zeros a buffer of type EfiBootServicesData.\r
\r
  Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, clears the\r
  buffer with zeros, and returns a pointer to the allocated buffer.  If AllocationSize is 0, then a\r
  valid buffer of 0 size is returned.  If there is not enough memory remaining to satisfy the\r
  request, then NULL is returned.\r
\r
  @param  AllocationSize        The number of bytes to allocate and zero.\r
\r
  @return A pointer to the allocated buffer or NULL if allocation fails.\r
\r
**/\r
VOID *\r
EFIAPI\r
AllocateZeroPool (\r
  IN UINTN  AllocationSize\r
  )\r
{\r
  VOID *Buffer;\r
\r
  Buffer = AllocatePool (AllocationSize);\r
  if (Buffer == NULL) {\r
    return NULL;\r
  }\r
\r
  ZeroMem (Buffer, AllocationSize);\r
\r
  return Buffer;\r
}\r
\r
/**\r
  Frees a buffer that was previously allocated with one of the pool allocation functions in the\r
  Memory Allocation Library.\r
\r
  Frees the buffer specified by Buffer.  Buffer must have been allocated on a previous call to the\r
  pool allocation services of the Memory Allocation Library.  If it is not possible to free pool\r
  resources, then this function will perform no actions.\r
\r
  If Buffer was not allocated with a pool allocation function in the Memory Allocation Library,\r
  then ASSERT().\r
\r
  @param  Buffer                Pointer to the buffer to free.\r
\r
**/\r
VOID\r
EFIAPI\r
FreePool (\r
  IN VOID   *Buffer\r
  )\r
{\r
  // Not implemented yet\r
}\r