path: root/StandaloneMmPkg/Library/StandaloneMmCoreHobLib/Common.c

/** @file
  HOB Library implementation for Standalone MM Core.

Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017 - 2018, ARM Limited. All rights reserved.<BR>

SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <PiMm.h>

#include <Library/HobLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/StandaloneMmCoreEntryPoint.h>

#include <Guid/MemoryAllocationHob.h>

/**
  Returns the pointer to the HOB list.

  This function returns the pointer to first HOB in the list.
  If the pointer to the HOB list is NULL, then ASSERT().

  @return The pointer to the HOB list.

**/
VOID *
EFIAPI
GetHobList (
  VOID
  )
{
  ASSERT (gHobList != NULL);
  return gHobList;
}

/**
  Returns the next instance of a HOB type from the starting HOB.

  This function searches the first instance of a HOB type from the starting HOB pointer.
  If there does not exist such HOB type from the starting HOB pointer, it will return NULL.
  In contrast with macro GET_NEXT_HOB(), this function does not skip the starting HOB pointer
  unconditionally: it returns HobStart back if HobStart itself meets the requirement;
  caller is required to use GET_NEXT_HOB() if it wishes to skip current HobStart.

  If HobStart is NULL, then ASSERT().

  @param  Type          The HOB type to return.
  @param  HobStart      The starting HOB pointer to search from.

  @return The next instance of a HOB type from the starting HOB.

**/
VOID *
EFIAPI
GetNextHob (
  IN UINT16                 Type,
  IN CONST VOID             *HobStart
  )
{
  EFI_PEI_HOB_POINTERS  Hob;

  ASSERT (HobStart != NULL);

  Hob.Raw = (UINT8 *) HobStart;
  //
  // Parse the HOB list until end of list or matching type is found.
  //
  while (!END_OF_HOB_LIST (Hob)) {
    if (Hob.Header->HobType == Type) {
      return Hob.Raw;
    }
    Hob.Raw = GET_NEXT_HOB (Hob);
  }
  return NULL;
}

/**
  Returns the first instance of a HOB type among the whole HOB list.

  This function searches the first instance of a HOB type among the whole HOB list.
  If there does not exist such HOB type in the HOB list, it will return NULL.

  If the pointer to the HOB list is NULL, then ASSERT().

  @param  Type          The HOB type to return.

  @return The next instance of a HOB type from the starting HOB.

**/
VOID *
EFIAPI
GetFirstHob (
  IN UINT16                 Type
  )
{
  VOID      *HobList;

  HobList = GetHobList ();
  return GetNextHob (Type, HobList);
}

/**
  Returns the next instance of the matched GUID HOB from the starting HOB.

  This function searches the first instance of a HOB from the starting HOB pointer.
  Such HOB should satisfy two conditions:
  its HOB type is EFI_HOB_TYPE_GUID_EXTENSION, and its GUID Name equals to the input Guid.
  If such a HOB from the starting HOB pointer does not exist, it will return NULL.
  Caller is required to apply GET_GUID_HOB_DATA () and GET_GUID_HOB_DATA_SIZE ()
  to extract the data section and its size information, respectively.
  In contrast with macro GET_NEXT_HOB(), this function does not skip the starting HOB pointer
  unconditionally: it returns HobStart back if HobStart itself meets the requirement;
  caller is required to use GET_NEXT_HOB() if it wishes to skip current HobStart.

  If Guid is NULL, then ASSERT().
  If HobStart is NULL, then ASSERT().

  @param  Guid          The GUID to match with in the HOB list.
  @param  HobStart      A pointer to a Guid.

  @return The next instance of the matched GUID HOB from the starting HOB.

**/
VOID *
EFIAPI
GetNextGuidHob (
  IN CONST EFI_GUID         *Guid,
  IN CONST VOID             *HobStart
  )
{
  EFI_PEI_HOB_POINTERS  GuidHob;

  GuidHob.Raw = (UINT8 *) HobStart;
  while ((GuidHob.Raw = GetNextHob (EFI_HOB_TYPE_GUID_EXTENSION, GuidHob.Raw)) != NULL) {
    if (CompareGuid (Guid, &GuidHob.Guid->Name)) {
      break;
    }
    GuidHob.Raw = GET_NEXT_HOB (GuidHob);
  }
  return GuidHob.Raw;
}

/**
  Returns the first instance of the matched GUID HOB among the whole HOB list.

  This function searches the first instance of a HOB among the whole HOB list.
  Such HOB should satisfy two conditions:
  its HOB type is EFI_HOB_TYPE_GUID_EXTENSION and its GUID Name equals to the input Guid.
  If such a HOB from the starting HOB pointer does not exist, it will return NULL.
  Caller is required to apply GET_GUID_HOB_DATA () and GET_GUID_HOB_DATA_SIZE ()
  to extract the data section and its size information, respectively.

  If the pointer to the HOB list is NULL, then ASSERT().
  If Guid is NULL, then ASSERT().

  @param  Guid          The GUID to match with in the HOB list.

  @return The first instance of the matched GUID HOB among the whole HOB list.

**/
VOID *
EFIAPI
GetFirstGuidHob (
  IN CONST EFI_GUID         *Guid
  )
{
  VOID      *HobList;

  HobList = GetHobList ();
  return GetNextGuidHob (Guid, HobList);
}

/**
  Get the system boot mode from the HOB list.

  This function returns the system boot mode information from the
  PHIT HOB in HOB list.

  If the pointer to the HOB list is NULL, then ASSERT().

  @param  VOID

  @return The Boot Mode.

**/
EFI_BOOT_MODE
EFIAPI
GetBootModeHob (
  VOID
  )
{
  EFI_HOB_HANDOFF_INFO_TABLE    *HandOffHob;

  HandOffHob = (EFI_HOB_HANDOFF_INFO_TABLE *) GetHobList ();

  return HandOffHob->BootMode;
}


/**
  Builds a HOB that describes a chunk of system memory with Owner GUID.

  This function builds a HOB that describes a chunk of system memory.
  If there is no additional space for HOB creation, then ASSERT().

  @param  ResourceType        The type of resource described by this HOB.
  @param  ResourceAttribute   The resource attributes of the memory described by this HOB.
  @param  PhysicalStart       The 64 bit physical address of memory described by this HOB.
  @param  NumberOfBytes       The length of the memory described by this HOB in bytes.
  @param  OwnerGUID           GUID for the owner of this resource.

**/
VOID
EFIAPI
BuildResourceDescriptorWithOwnerHob (
  IN EFI_RESOURCE_TYPE            ResourceType,
  IN EFI_RESOURCE_ATTRIBUTE_TYPE  ResourceAttribute,
  IN EFI_PHYSICAL_ADDRESS         PhysicalStart,
  IN UINT64                       NumberOfBytes,
  IN EFI_GUID                     *OwnerGUID
  )
{
  ASSERT (FALSE);
}

/**
  Builds a Capsule Volume HOB.

  This function builds a Capsule Volume HOB.
  If the platform does not support Capsule Volume HOBs, then ASSERT().
  If there is no additional space for HOB creation, then ASSERT().

  @param  BaseAddress   The base address of the Capsule Volume.
  @param  Length        The size of the Capsule Volume in bytes.

**/
VOID
EFIAPI
BuildCvHob (
  IN EFI_PHYSICAL_ADDRESS        BaseAddress,
  IN UINT64                      Length
  )
{
  ASSERT (FALSE);
}


/**
  Builds a HOB for the BSP store.

  This function builds a HOB for BSP store.
  If there is no additional space for HOB creation, then ASSERT().

  @param  BaseAddress   The 64 bit physical address of the BSP.
  @param  Length        The length of the BSP store in bytes.
  @param  MemoryType    Type of memory allocated by this HOB.

**/
VOID
EFIAPI
BuildBspStoreHob (
  IN EFI_PHYSICAL_ADDRESS        BaseAddress,
  IN UINT64                      Length,
  IN EFI_MEMORY_TYPE             MemoryType
  )
{
  ASSERT (FALSE);
}

/**
  Builds a HOB for the Stack.

  This function builds a HOB for the stack.
  If there is no additional space for HOB creation, then ASSERT().

  @param  BaseAddress   The 64 bit physical address of the Stack.
  @param  Length        The length of the stack in bytes.

**/
VOID
EFIAPI
BuildStackHob (
  IN EFI_PHYSICAL_ADDRESS        BaseAddress,
  IN UINT64                      Length
  )
{
  ASSERT (FALSE);
}