MdeModulePkg/SdMmcPciHcDxe: Do not map memory for non DMA transfer

[mirror_edk2.git] / MdeModulePkg / Bus / Pci / XhciDxe / UsbHcMem.c

/** @file\r
\r
  Routine procedures for memory allocate/free.\r
\r
Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
\r
#include "Xhci.h"\r
\r
\r
/**\r
  Allocate a block of memory to be used by the buffer pool.\r
\r
  @param  Pool           The buffer pool to allocate memory for.\r
  @param  Pages          How many pages to allocate.\r
\r
  @return The allocated memory block or NULL if failed.\r
\r
**/\r
USBHC_MEM_BLOCK *\r
UsbHcAllocMemBlock (\r
  IN  USBHC_MEM_POOL      *Pool,\r
  IN  UINTN               Pages\r
  )\r
{\r
  USBHC_MEM_BLOCK         *Block;\r
  EFI_PCI_IO_PROTOCOL     *PciIo;\r
  VOID                    *BufHost;\r
  VOID                    *Mapping;\r
  EFI_PHYSICAL_ADDRESS    MappedAddr;\r
  UINTN                   Bytes;\r
  EFI_STATUS              Status;\r
\r
  PciIo = Pool->PciIo;\r
\r
  Block = AllocateZeroPool (sizeof (USBHC_MEM_BLOCK));\r
  if (Block == NULL) {\r
    return NULL;\r
  }\r
\r
  //\r
  // each bit in the bit array represents USBHC_MEM_UNIT\r
  // bytes of memory in the memory block.\r
  //\r
  ASSERT (USBHC_MEM_UNIT * 8 <= EFI_PAGE_SIZE);\r
\r
  Block->BufLen   = EFI_PAGES_TO_SIZE (Pages);\r
  Block->BitsLen  = Block->BufLen / (USBHC_MEM_UNIT * 8);\r
  Block->Bits     = AllocateZeroPool (Block->BitsLen);\r
\r
  if (Block->Bits == NULL) {\r
    gBS->FreePool (Block);\r
    return NULL;\r
  }\r
\r
  //\r
  // Allocate the number of Pages of memory, then map it for\r
  // bus master read and write.\r
  //\r
  Status = PciIo->AllocateBuffer (\r
                    PciIo,\r
                    AllocateAnyPages,\r
                    EfiBootServicesData,\r
                    Pages,\r
                    &BufHost,\r
                    0\r
                    );\r
\r
  if (EFI_ERROR (Status)) {\r
    goto FREE_BITARRAY;\r
  }\r
\r
  Bytes = EFI_PAGES_TO_SIZE (Pages);\r
  Status = PciIo->Map (\r
                    PciIo,\r
                    EfiPciIoOperationBusMasterCommonBuffer,\r
                    BufHost,\r
                    &Bytes,\r
                    &MappedAddr,\r
                    &Mapping\r
                    );\r
\r
  if (EFI_ERROR (Status) || (Bytes != EFI_PAGES_TO_SIZE (Pages))) {\r
    goto FREE_BUFFER;\r
  }\r
\r
  Block->BufHost  = BufHost;\r
  Block->Buf      = (UINT8 *) ((UINTN) MappedAddr);\r
  Block->Mapping  = Mapping;\r
\r
  return Block;\r
\r
FREE_BUFFER:\r
  PciIo->FreeBuffer (PciIo, Pages, BufHost);\r
\r
FREE_BITARRAY:\r
  gBS->FreePool (Block->Bits);\r
  gBS->FreePool (Block);\r
  return NULL;\r
}\r
\r
\r
/**\r
  Free the memory block from the memory pool.\r
\r
  @param  Pool           The memory pool to free the block from.\r
  @param  Block          The memory block to free.\r
\r
**/\r
VOID\r
UsbHcFreeMemBlock (\r
  IN USBHC_MEM_POOL       *Pool,\r
  IN USBHC_MEM_BLOCK      *Block\r
  )\r
{\r
  EFI_PCI_IO_PROTOCOL     *PciIo;\r
\r
  ASSERT ((Pool != NULL) && (Block != NULL));\r
\r
  PciIo = Pool->PciIo;\r
\r
  //\r
  // Unmap the common buffer then free the structures\r
  //\r
  PciIo->Unmap (PciIo, Block->Mapping);\r
  PciIo->FreeBuffer (PciIo, EFI_SIZE_TO_PAGES (Block->BufLen), Block->BufHost);\r
\r
  gBS->FreePool (Block->Bits);\r
  gBS->FreePool (Block);\r
}\r
\r
\r
/**\r
  Alloc some memory from the block.\r
\r
  @param  Block          The memory block to allocate memory from.\r
  @param  Units          Number of memory units to allocate.\r
\r
  @return The pointer to the allocated memory. If couldn't allocate the needed memory,\r
          the return value is NULL.\r
\r
**/\r
VOID *\r
UsbHcAllocMemFromBlock (\r
  IN  USBHC_MEM_BLOCK     *Block,\r
  IN  UINTN               Units\r
  )\r
{\r
  UINTN                   Byte;\r
  UINT8                   Bit;\r
  UINTN                   StartByte;\r
  UINT8                   StartBit;\r
  UINTN                   Available;\r
  UINTN                   Count;\r
\r
  ASSERT ((Block != 0) && (Units != 0));\r
\r
  StartByte  = 0;\r
  StartBit   = 0;\r
  Available  = 0;\r
\r
  for (Byte = 0, Bit = 0; Byte < Block->BitsLen;) {\r
    //\r
    // If current bit is zero, the corresponding memory unit is\r
    // available, otherwise we need to restart our searching.\r
    // Available counts the consective number of zero bit.\r
    //\r
    if (!USB_HC_BIT_IS_SET (Block->Bits[Byte], Bit)) {\r
      Available++;\r
\r
      if (Available >= Units) {\r
        break;\r
      }\r
\r
      NEXT_BIT (Byte, Bit);\r
\r
    } else {\r
      NEXT_BIT (Byte, Bit);\r
\r
      Available  = 0;\r
      StartByte  = Byte;\r
      StartBit   = Bit;\r
    }\r
  }\r
\r
  if (Available < Units) {\r
    return NULL;\r
  }\r
\r
  //\r
  // Mark the memory as allocated\r
  //\r
  Byte  = StartByte;\r
  Bit   = StartBit;\r
\r
  for (Count = 0; Count < Units; Count++) {\r
    ASSERT (!USB_HC_BIT_IS_SET (Block->Bits[Byte], Bit));\r
\r
    Block->Bits[Byte] = (UINT8) (Block->Bits[Byte] | USB_HC_BIT (Bit));\r
    NEXT_BIT (Byte, Bit);\r
  }\r
\r
  return Block->BufHost + (StartByte * 8 + StartBit) * USBHC_MEM_UNIT;\r
}\r
\r
/**\r
  Calculate the corresponding pci bus address according to the Mem parameter.\r
\r
  @param  Pool           The memory pool of the host controller.\r
  @param  Mem            The pointer to host memory.\r
  @param  Size           The size of the memory region.\r
\r
  @return                The pci memory address\r
\r
**/\r
EFI_PHYSICAL_ADDRESS\r
UsbHcGetPciAddrForHostAddr (\r
  IN USBHC_MEM_POOL       *Pool,\r
  IN VOID                 *Mem,\r
  IN UINTN                Size\r
  )\r
{\r
  USBHC_MEM_BLOCK         *Head;\r
  USBHC_MEM_BLOCK         *Block;\r
  UINTN                   AllocSize;\r
  EFI_PHYSICAL_ADDRESS    PhyAddr;\r
  UINTN                   Offset;\r
\r
  Head      = Pool->Head;\r
  AllocSize = USBHC_MEM_ROUND (Size);\r
\r
  if (Mem == NULL) {\r
    return 0;\r
  }\r
\r
  for (Block = Head; Block != NULL; Block = Block->Next) {\r
    //\r
    // scan the memory block list for the memory block that\r
    // completely contains the allocated memory.\r
    //\r
    if ((Block->BufHost <= (UINT8 *) Mem) && (((UINT8 *) Mem + AllocSize) <= (Block->BufHost + Block->BufLen))) {\r
      break;\r
    }\r
  }\r
\r
  ASSERT ((Block != NULL));\r
  //\r
  // calculate the pci memory address for host memory address.\r
  //\r
  Offset = (UINT8 *)Mem - Block->BufHost;\r
  PhyAddr = (EFI_PHYSICAL_ADDRESS)(UINTN) (Block->Buf + Offset);\r
  return PhyAddr;\r
}\r
\r
/**\r
  Calculate the corresponding host address according to the pci address.\r
\r
  @param  Pool           The memory pool of the host controller.\r
  @param  Mem            The pointer to pci memory.\r
  @param  Size           The size of the memory region.\r
\r
  @return                The host memory address\r
\r
**/\r
EFI_PHYSICAL_ADDRESS\r
UsbHcGetHostAddrForPciAddr (\r
  IN USBHC_MEM_POOL       *Pool,\r
  IN VOID                 *Mem,\r
  IN UINTN                Size\r
  )\r
{\r
  USBHC_MEM_BLOCK         *Head;\r
  USBHC_MEM_BLOCK         *Block;\r
  UINTN                   AllocSize;\r
  EFI_PHYSICAL_ADDRESS    HostAddr;\r
  UINTN                   Offset;\r
\r
  Head      = Pool->Head;\r
  AllocSize = USBHC_MEM_ROUND (Size);\r
\r
  if (Mem == NULL) {\r
    return 0;\r
  }\r
\r
  for (Block = Head; Block != NULL; Block = Block->Next) {\r
    //\r
    // scan the memory block list for the memory block that\r
    // completely contains the allocated memory.\r
    //\r
    if ((Block->Buf <= (UINT8 *) Mem) && (((UINT8 *) Mem + AllocSize) <= (Block->Buf + Block->BufLen))) {\r
      break;\r
    }\r
  }\r
\r
  ASSERT ((Block != NULL));\r
  //\r
  // calculate the pci memory address for host memory address.\r
  //\r
  Offset = (UINT8 *)Mem - Block->Buf;\r
  HostAddr = (EFI_PHYSICAL_ADDRESS)(UINTN) (Block->BufHost + Offset);\r
  return HostAddr;\r
}\r
\r
/**\r
  Insert the memory block to the pool's list of the blocks.\r
\r
  @param  Head           The head of the memory pool's block list.\r
  @param  Block          The memory block to insert.\r
\r
**/\r
VOID\r
UsbHcInsertMemBlockToPool (\r
  IN USBHC_MEM_BLOCK      *Head,\r
  IN USBHC_MEM_BLOCK      *Block\r
  )\r
{\r
  ASSERT ((Head != NULL) && (Block != NULL));\r
  Block->Next = Head->Next;\r
  Head->Next  = Block;\r
}\r
\r
\r
/**\r
  Is the memory block empty?\r
\r
  @param  Block   The memory block to check.\r
\r
  @retval TRUE    The memory block is empty.\r
  @retval FALSE   The memory block isn't empty.\r
\r
**/\r
BOOLEAN\r
UsbHcIsMemBlockEmpty (\r
  IN USBHC_MEM_BLOCK     *Block\r
  )\r
{\r
  UINTN                   Index;\r
\r
  for (Index = 0; Index < Block->BitsLen; Index++) {\r
    if (Block->Bits[Index] != 0) {\r
      return FALSE;\r
    }\r
  }\r
\r
  return TRUE;\r
}\r
\r
\r
/**\r
  Unlink the memory block from the pool's list.\r
\r
  @param  Head           The block list head of the memory's pool.\r
  @param  BlockToUnlink  The memory block to unlink.\r
\r
**/\r
VOID\r
UsbHcUnlinkMemBlock (\r
  IN USBHC_MEM_BLOCK      *Head,\r
  IN USBHC_MEM_BLOCK      *BlockToUnlink\r
  )\r
{\r
  USBHC_MEM_BLOCK         *Block;\r
\r
  ASSERT ((Head != NULL) && (BlockToUnlink != NULL));\r
\r
  for (Block = Head; Block != NULL; Block = Block->Next) {\r
    if (Block->Next == BlockToUnlink) {\r
      Block->Next         = BlockToUnlink->Next;\r
      BlockToUnlink->Next = NULL;\r
      break;\r
    }\r
  }\r
}\r
\r
\r
/**\r
  Initialize the memory management pool for the host controller.\r
\r
  @param  PciIo                The PciIo that can be used to access the host controller.\r
\r
  @retval EFI_SUCCESS          The memory pool is initialized.\r
  @retval EFI_OUT_OF_RESOURCE  Fail to init the memory pool.\r
\r
**/\r
USBHC_MEM_POOL *\r
UsbHcInitMemPool (\r
  IN EFI_PCI_IO_PROTOCOL  *PciIo\r
  )\r
{\r
  USBHC_MEM_POOL          *Pool;\r
\r
  Pool = AllocatePool (sizeof (USBHC_MEM_POOL));\r
\r
  if (Pool == NULL) {\r
    return Pool;\r
  }\r
\r
  Pool->PciIo   = PciIo;\r
  Pool->Head    = UsbHcAllocMemBlock (Pool, USBHC_MEM_DEFAULT_PAGES);\r
\r
  if (Pool->Head == NULL) {\r
    gBS->FreePool (Pool);\r
    Pool = NULL;\r
  }\r
\r
  return Pool;\r
}\r
\r
\r
/**\r
  Release the memory management pool.\r
\r
  @param  Pool              The USB memory pool to free.\r
\r
  @retval EFI_SUCCESS       The memory pool is freed.\r
  @retval EFI_DEVICE_ERROR  Failed to free the memory pool.\r
\r
**/\r
EFI_STATUS\r
UsbHcFreeMemPool (\r
  IN USBHC_MEM_POOL       *Pool\r
  )\r
{\r
  USBHC_MEM_BLOCK *Block;\r
\r
  ASSERT (Pool->Head != NULL);\r
\r
  //\r
  // Unlink all the memory blocks from the pool, then free them.\r
  // UsbHcUnlinkMemBlock can't be used to unlink and free the\r
  // first block.\r
  //\r
  for (Block = Pool->Head->Next; Block != NULL; Block = Pool->Head->Next) {\r
    UsbHcUnlinkMemBlock (Pool->Head, Block);\r
    UsbHcFreeMemBlock (Pool, Block);\r
  }\r
\r
  UsbHcFreeMemBlock (Pool, Pool->Head);\r
  gBS->FreePool (Pool);\r
  return EFI_SUCCESS;\r
}\r
\r
\r
/**\r
  Allocate some memory from the host controller's memory pool\r
  which can be used to communicate with host controller.\r
\r
  @param  Pool           The host controller's memory pool.\r
  @param  Size           Size of the memory to allocate.\r
\r
  @return The allocated memory or NULL.\r
\r
**/\r
VOID *\r
UsbHcAllocateMem (\r
  IN  USBHC_MEM_POOL      *Pool,\r
  IN  UINTN               Size\r
  )\r
{\r
  USBHC_MEM_BLOCK         *Head;\r
  USBHC_MEM_BLOCK         *Block;\r
  USBHC_MEM_BLOCK         *NewBlock;\r
  VOID                    *Mem;\r
  UINTN                   AllocSize;\r
  UINTN                   Pages;\r
\r
  Mem       = NULL;\r
  AllocSize = USBHC_MEM_ROUND (Size);\r
  Head      = Pool->Head;\r
  ASSERT (Head != NULL);\r
\r
  //\r
  // First check whether current memory blocks can satisfy the allocation.\r
  //\r
  for (Block = Head; Block != NULL; Block = Block->Next) {\r
    Mem = UsbHcAllocMemFromBlock (Block, AllocSize / USBHC_MEM_UNIT);\r
\r
    if (Mem != NULL) {\r
      ZeroMem (Mem, Size);\r
      break;\r
    }\r
  }\r
\r
  if (Mem != NULL) {\r
    return Mem;\r
  }\r
\r
  //\r
  // Create a new memory block if there is not enough memory\r
  // in the pool. If the allocation size is larger than the\r
  // default page number, just allocate a large enough memory\r
  // block. Otherwise allocate default pages.\r
  //\r
  if (AllocSize > EFI_PAGES_TO_SIZE (USBHC_MEM_DEFAULT_PAGES)) {\r
    Pages = EFI_SIZE_TO_PAGES (AllocSize) + 1;\r
  } else {\r
    Pages = USBHC_MEM_DEFAULT_PAGES;\r
  }\r
\r
  NewBlock = UsbHcAllocMemBlock (Pool, Pages);\r
\r
  if (NewBlock == NULL) {\r
    DEBUG ((EFI_D_ERROR, "UsbHcAllocateMem: failed to allocate block\n"));\r
    return NULL;\r
  }\r
\r
  //\r
  // Add the new memory block to the pool, then allocate memory from it\r
  //\r
  UsbHcInsertMemBlockToPool (Head, NewBlock);\r
  Mem = UsbHcAllocMemFromBlock (NewBlock, AllocSize / USBHC_MEM_UNIT);\r
\r
  if (Mem != NULL) {\r
    ZeroMem (Mem, Size);\r
  }\r
\r
  return Mem;\r
}\r
\r
\r
/**\r
  Free the allocated memory back to the memory pool.\r
\r
  @param  Pool           The memory pool of the host controller.\r
  @param  Mem            The memory to free.\r
  @param  Size           The size of the memory to free.\r
\r
**/\r
VOID\r
UsbHcFreeMem (\r
  IN USBHC_MEM_POOL       *Pool,\r
  IN VOID                 *Mem,\r
  IN UINTN                Size\r
  )\r
{\r
  USBHC_MEM_BLOCK         *Head;\r
  USBHC_MEM_BLOCK         *Block;\r
  UINT8                   *ToFree;\r
  UINTN                   AllocSize;\r
  UINTN                   Byte;\r
  UINTN                   Bit;\r
  UINTN                   Count;\r
\r
  Head      = Pool->Head;\r
  AllocSize = USBHC_MEM_ROUND (Size);\r
  ToFree    = (UINT8 *) Mem;\r
\r
  for (Block = Head; Block != NULL; Block = Block->Next) {\r
    //\r
    // scan the memory block list for the memory block that\r
    // completely contains the memory to free.\r
    //\r
    if ((Block->BufHost <= ToFree) && ((ToFree + AllocSize) <= (Block->BufHost + Block->BufLen))) {\r
      //\r
      // compute the start byte and bit in the bit array\r
      //\r
      Byte  = ((ToFree - Block->BufHost) / USBHC_MEM_UNIT) / 8;\r
      Bit   = ((ToFree - Block->BufHost) / USBHC_MEM_UNIT) % 8;\r
\r
      //\r
      // reset associated bits in bit array\r
      //\r
      for (Count = 0; Count < (AllocSize / USBHC_MEM_UNIT); Count++) {\r
        ASSERT (USB_HC_BIT_IS_SET (Block->Bits[Byte], Bit));\r
\r
        Block->Bits[Byte] = (UINT8) (Block->Bits[Byte] ^ USB_HC_BIT (Bit));\r
        NEXT_BIT (Byte, Bit);\r
      }\r
\r
      break;\r
    }\r
  }\r
\r
  //\r
  // If Block == NULL, it means that the current memory isn't\r
  // in the host controller's pool. This is critical because\r
  // the caller has passed in a wrong memory point\r
  //\r
  ASSERT (Block != NULL);\r
\r
  //\r
  // Release the current memory block if it is empty and not the head\r
  //\r
  if ((Block != Head) && UsbHcIsMemBlockEmpty (Block)) {\r
    UsbHcUnlinkMemBlock (Head, Block);\r
    UsbHcFreeMemBlock (Pool, Block);\r
  }\r
\r
  return ;\r
}\r
\r
/**\r
  Allocates pages at a specified alignment that are suitable for an EfiPciIoOperationBusMasterCommonBuffer mapping.\r
\r
  If Alignment is not a power of two and Alignment is not zero, then ASSERT().\r
\r
  @param  PciIo                 The PciIo that can be used to access the host controller.\r
  @param  Pages                 The number of pages to allocate.\r
  @param  Alignment             The requested alignment of the allocation.  Must be a power of two.\r
  @param  HostAddress           The system memory address to map to the PCI controller.\r
  @param  DeviceAddress         The resulting map address for the bus master PCI controller to\r
                                use to access the hosts HostAddress.\r
  @param  Mapping               A resulting value to pass to Unmap().\r
\r
  @retval EFI_SUCCESS           Success to allocate aligned pages.\r
  @retval EFI_INVALID_PARAMETER Pages or Alignment is not valid.\r
  @retval EFI_OUT_OF_RESOURCES  Do not have enough resources to allocate memory.\r
\r
\r
**/\r
EFI_STATUS\r
UsbHcAllocateAlignedPages (\r
  IN EFI_PCI_IO_PROTOCOL    *PciIo,\r
  IN UINTN                  Pages,\r
  IN UINTN                  Alignment,\r
  OUT VOID                  **HostAddress,\r
  OUT EFI_PHYSICAL_ADDRESS  *DeviceAddress,\r
  OUT VOID                  **Mapping\r
  )\r
{\r
  EFI_STATUS            Status;\r
  VOID                  *Memory;\r
  UINTN                 AlignedMemory;\r
  UINTN                 AlignmentMask;\r
  UINTN                 UnalignedPages;\r
  UINTN                 RealPages;\r
  UINTN                 Bytes;\r
\r
  //\r
  // Alignment must be a power of two or zero.\r
  //\r
  ASSERT ((Alignment & (Alignment - 1)) == 0);\r
\r
  if ((Alignment & (Alignment - 1)) != 0) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  if (Pages == 0) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
  if (Alignment > EFI_PAGE_SIZE) {\r
    //\r
    // Calculate the total number of pages since alignment is larger than page size.\r
    //\r
    AlignmentMask  = Alignment - 1;\r
    RealPages      = Pages + EFI_SIZE_TO_PAGES (Alignment);\r
    //\r
    // Make sure that Pages plus EFI_SIZE_TO_PAGES (Alignment) does not overflow.\r
    //\r
    ASSERT (RealPages > Pages);\r
\r
    Status = PciIo->AllocateBuffer (\r
                      PciIo,\r
                      AllocateAnyPages,\r
                      EfiBootServicesData,\r
                      RealPages,\r
                      &Memory,\r
                      0\r
                      );\r
    if (EFI_ERROR (Status)) {\r
      return EFI_OUT_OF_RESOURCES;\r
    }\r
    AlignedMemory  = ((UINTN) Memory + AlignmentMask) & ~AlignmentMask;\r
    UnalignedPages = EFI_SIZE_TO_PAGES (AlignedMemory - (UINTN) Memory);\r
    if (UnalignedPages > 0) {\r
      //\r
      // Free first unaligned page(s).\r
      //\r
      Status = PciIo->FreeBuffer (PciIo, UnalignedPages, Memory);\r
      ASSERT_EFI_ERROR (Status);\r
    }\r
    Memory         = (VOID *)(UINTN)(AlignedMemory + EFI_PAGES_TO_SIZE (Pages));\r
    UnalignedPages = RealPages - Pages - UnalignedPages;\r
    if (UnalignedPages > 0) {\r
      //\r
      // Free last unaligned page(s).\r
      //\r
      Status = PciIo->FreeBuffer (PciIo, UnalignedPages, Memory);\r
      ASSERT_EFI_ERROR (Status);\r
    }\r
  } else {\r
    //\r
    // Do not over-allocate pages in this case.\r
    //\r
    Status = PciIo->AllocateBuffer (\r
                      PciIo,\r
                      AllocateAnyPages,\r
                      EfiBootServicesData,\r
                      Pages,\r
                      &Memory,\r
                      0\r
                      );\r
    if (EFI_ERROR (Status)) {\r
      return EFI_OUT_OF_RESOURCES;\r
    }\r
    AlignedMemory  = (UINTN) Memory;\r
  }\r
\r
  Bytes = EFI_PAGES_TO_SIZE (Pages);\r
  Status = PciIo->Map (\r
                    PciIo,\r
                    EfiPciIoOperationBusMasterCommonBuffer,\r
                    (VOID *) AlignedMemory,\r
                    &Bytes,\r
                    DeviceAddress,\r
                    Mapping\r
                    );\r
\r
  if (EFI_ERROR (Status) || (Bytes != EFI_PAGES_TO_SIZE (Pages))) {\r
    Status = PciIo->FreeBuffer (PciIo, Pages, (VOID *) AlignedMemory);\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  *HostAddress = (VOID *) AlignedMemory;\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Frees memory that was allocated with UsbHcAllocateAlignedPages().\r
\r
  @param  PciIo                 The PciIo that can be used to access the host controller.\r
  @param  HostAddress           The system memory address to map to the PCI controller.\r
  @param  Pages                 The number of 4 KB pages to free.\r
  @param  Mapping               The mapping value returned from Map().\r
\r
**/\r
VOID\r
UsbHcFreeAlignedPages (\r
  IN EFI_PCI_IO_PROTOCOL    *PciIo,\r
  IN VOID                   *HostAddress,\r
  IN UINTN                  Pages,\r
  VOID                      *Mapping\r
  )\r
{\r
  EFI_STATUS      Status;\r
\r
  ASSERT (Pages != 0);\r
\r
  Status = PciIo->Unmap (PciIo, Mapping);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  Status = PciIo->FreeBuffer (\r
                    PciIo,\r
                    Pages,\r
                    HostAddress\r
                    );\r
  ASSERT_EFI_ERROR (Status);\r
}\r