Re: [Xen-devel] [PATCH v2 12/29] ArmVirtualizationPkg: implement custom MemoryInitPeiLib

[Laszlo Ersek <lersek@xxxxxxxxxx>]

On 01/26/15 20:03, Ard Biesheuvel wrote:
> This implements a MemoryInitPeiLib instance that differs from the
> stock ArmPlatformPkg version only in the fact that it does not remove
> the memory used by the flash device (FD). The reason is that, when using
> PrePi, the DXE core is started immediately and never returns so there is
> no reason to preserve any of the memory that the flash device occupied
> originally, and it is preferable to release is so that the OS loader
> can reuse it. This is especially important for the relocatable PrePi
> configuration, which is aimed at being launched from a boot loader that
> itself adheres to the Linux arm64 boot protocol.
> 
> Contributed-under: TianoCore Contribution Agreement 1.0
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
> ---
>  
> .../Library/ArmVirtualizationMemoryInitPeiLib/ArmVirtualizationMemoryInitPeiLib.c
>               | 91 ++++++++++++++++++++++++++++++++++++++++++++++++
>  
> .../Library/ArmVirtualizationMemoryInitPeiLib/ArmVirtualizationMemoryInitPeiLib.inf
>             | 66 +++++++++++++++++++++++++++++++++++
>  2 files changed, 157 insertions(+)
> 
> diff --git 
> a/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmVirtualizationMemoryInitPeiLib/ArmVirtualizationMemoryInitPeiLib.c
>  
> b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmVirtualizationMemoryInitPeiLib/ArmVirtualizationMemoryInitPeiLib.c
> new file mode 100644
> index 000000000000..5f6cd059c47f
> --- /dev/null
> +++ 
> b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmVirtualizationMemoryInitPeiLib/ArmVirtualizationMemoryInitPeiLib.c
> @@ -0,0 +1,91 @@
> +/** @file
> +*
> +*  Copyright (c) 2011-2014, ARM Limited. All rights reserved.
> +*  Copyright (c) 2014, Linaro Limited. All rights reserved.
> +*
> +*  This program and the accompanying materials
> +*  are licensed and made available under the terms and conditions of the BSD 
> License
> +*  which accompanies this distribution.  The full text of the license may be 
> found at
> +*  http://opensource.org/licenses/bsd-license.php
> +*
> +*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
> +*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR 
> IMPLIED.
> +*
> +**/
> +
> +#include <PiPei.h>
> +
> +#include <Library/ArmPlatformLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/HobLib.h>
> +#include <Library/MemoryAllocationLib.h>
> +#include <Library/PcdLib.h>
> +
> +VOID
> +BuildMemoryTypeInformationHob (
> +  VOID
> +  );
> +
> +VOID
> +InitMmu (
> +  VOID
> +  )
> +{
> +  ARM_MEMORY_REGION_DESCRIPTOR  *MemoryTable;
> +  VOID                          *TranslationTableBase;
> +  UINTN                         TranslationTableSize;
> +  RETURN_STATUS                 Status;
> +
> +  // Get Virtual Memory Map from the Platform Library
> +  ArmPlatformGetVirtualMemoryMap (&MemoryTable);
> +
> +  //Note: Because we called PeiServicesInstallPeiMemory() before to call 
> InitMmu() the MMU Page Table resides in
> +  //      DRAM (even at the top of DRAM as it is the first permanent memory 
> allocation)
> +  Status = ArmConfigureMmu (MemoryTable, &TranslationTableBase, 
> &TranslationTableSize);
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((EFI_D_ERROR, "Error: Failed to enable MMU\n"));
> +  }
> +}
> +
> +EFI_STATUS
> +EFIAPI
> +MemoryPeim (
> +  IN EFI_PHYSICAL_ADDRESS               UefiMemoryBase,
> +  IN UINT64                             UefiMemorySize
> +  )
> +{
> +  EFI_RESOURCE_ATTRIBUTE_TYPE ResourceAttributes;
> +
> +  // Ensure PcdSystemMemorySize has been set
> +  ASSERT (PcdGet64 (PcdSystemMemorySize) != 0);
> +
> +  //
> +  // Now, the permanent memory has been installed, we can call 
> AllocatePages()
> +  //
> +  ResourceAttributes = (
> +      EFI_RESOURCE_ATTRIBUTE_PRESENT |
> +      EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
> +      EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |
> +      EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |
> +      EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
> +      EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE |
> +      EFI_RESOURCE_ATTRIBUTE_TESTED
> +  );
> +
> +  BuildResourceDescriptorHob (
> +      EFI_RESOURCE_SYSTEM_MEMORY,
> +      ResourceAttributes,
> +      PcdGet64 (PcdSystemMemoryBase),
> +      PcdGet64 (PcdSystemMemorySize)
> +  );
> +
> +  // Build Memory Allocation Hob
> +  InitMmu ();
> +
> +  if (FeaturePcdGet (PcdPrePiProduceMemoryTypeInformationHob)) {
> +    // Optional feature that helps prevent EFI memory map fragmentation.
> +    BuildMemoryTypeInformationHob ();
> +  }
> +
> +  return EFI_SUCCESS;
> +}
> diff --git 
> a/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmVirtualizationMemoryInitPeiLib/ArmVirtualizationMemoryInitPeiLib.inf
>  
> b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmVirtualizationMemoryInitPeiLib/ArmVirtualizationMemoryInitPeiLib.inf
> new file mode 100644
> index 000000000000..fcdae06de7c2
> --- /dev/null
> +++ 
> b/ArmPlatformPkg/ArmVirtualizationPkg/Library/ArmVirtualizationMemoryInitPeiLib/ArmVirtualizationMemoryInitPeiLib.inf
> @@ -0,0 +1,66 @@
> +#/** @file
> +#
> +#  Copyright (c) 2011-2014, ARM Ltd. All rights reserved.<BR>
> +#  Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
> +#  This program and the accompanying materials
> +#  are licensed and made available under the terms and conditions of the BSD 
> License
> +#  which accompanies this distribution.  The full text of the license may be 
> found at
> +#  http://opensource.org/licenses/bsd-license.php
> +#
> +#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
> +#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR 
> IMPLIED.
> +#
> +#**/
> +
> +[Defines]
> +  INF_VERSION                    = 0x00010005
> +  BASE_NAME                      = ArmVirtMemoryInitPeiLib
> +  FILE_GUID                      = 021b6156-3cc8-4e99-85ee-13d8a871edf2
> +  MODULE_TYPE                    = SEC
> +  VERSION_STRING                 = 1.0
> +  LIBRARY_CLASS                  = MemoryInitPeiLib
> +
> +[Sources]
> +  ArmVirtualizationMemoryInitPeiLib.c
> +
> +[Packages]
> +  MdePkg/MdePkg.dec
> +  MdeModulePkg/MdeModulePkg.dec
> +  EmbeddedPkg/EmbeddedPkg.dec
> +  ArmPkg/ArmPkg.dec
> +  ArmPlatformPkg/ArmPlatformPkg.dec
> +
> +[LibraryClasses]
> +  DebugLib
> +  HobLib
> +  ArmLib
> +  ArmPlatformLib
> +
> +[Guids]
> +  gEfiMemoryTypeInformationGuid
> +
> +[FeaturePcd]
> +  gEmbeddedTokenSpaceGuid.PcdPrePiProduceMemoryTypeInformationHob
> +
> +[FixedPcd]
> +  gArmTokenSpaceGuid.PcdFdSize
> +
> +  gArmPlatformTokenSpaceGuid.PcdSystemMemoryUefiRegionSize
> +
> +  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiACPIReclaimMemory
> +  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiACPIMemoryNVS
> +  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiReservedMemoryType
> +  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiRuntimeServicesData
> +  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiRuntimeServicesCode
> +  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiBootServicesCode
> +  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiBootServicesData
> +  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderCode
> +  gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderData
> +
> +[Pcd]
> +  gArmTokenSpaceGuid.PcdSystemMemoryBase
> +  gArmTokenSpaceGuid.PcdSystemMemorySize
> +  gArmTokenSpaceGuid.PcdFdBaseAddress
> +
> +[Depex]
> +  TRUE
> 

As per the discussion of the previous version of this patch, and because
I can see that "ArmVirtualizationMemoryInitPeiLib.inf" is only
referenced in patch v2 29/29, where it is added to
"ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualizationXen.dsc":

Acked-by: Laszlo Ersek <lersek@xxxxxxxxxx>



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