SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Pei.c

   1 /** @file
   2   Debug Port Library implementation based on usb3 debug port.
   3
   4   Copyright (c) 2014 - 2017, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php.
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <PiPei.h>
  16 #include <Library/PeiServicesLib.h>
  17 #include <Ppi/MemoryDiscovered.h>
  18 #include "DebugCommunicationLibUsb3Internal.h"
  19
  20 /**
  21   Allocate aligned memory for XHC's usage.
  22
  23   @param  BufferSize      The size, in bytes, of the Buffer.
  24
  25   @return A pointer to the allocated buffer or NULL if allocation fails.
  26
  27 **/
  28 VOID*
  29 AllocateAlignBuffer (
  30   IN UINTN                    BufferSize
  31   )
  32 {
  33   VOID                     *Buf;
  34   EFI_PHYSICAL_ADDRESS     Address;
  35   EFI_STATUS               Status;
  36   VOID                     *MemoryDiscoveredPpi;
  37
  38   Buf = NULL;
  39
  40   //
  41   // Make sure the allocated memory is physical memory.
  42   //
  43   Status = PeiServicesLocatePpi (
  44              &gEfiPeiMemoryDiscoveredPpiGuid,
  45              0,
  46              NULL,
  47              (VOID **) &MemoryDiscoveredPpi
  48              );
  49   if (!EFI_ERROR (Status)) {
  50     Status = PeiServicesAllocatePages (EfiACPIMemoryNVS, EFI_SIZE_TO_PAGES (BufferSize), &Address);
  51     if (!EFI_ERROR (Status)) {
  52       Buf = (VOID *)(UINTN) Address;
  53     }
  54   }
  55   return Buf;
  56 }
  57