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/** @file
*
* Copyright (c) 2011-2015, ARM Limited. All rights reserved.
* Copyright (c) 2017, ARM 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/ArmMmuLib.h>
#include <Library/ArmPlatformLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/PcdLib.h>
VOID
BuildMemoryTypeInformationHob (
VOID
);
STATIC
VOID
InitMmu (
IN ARM_MEMORY_REGION_DESCRIPTOR *MemoryTable
)
{
VOID *TranslationTableBase;
UINTN TranslationTableSize;
RETURN_STATUS Status;
Status = ArmConfigureMmu (MemoryTable,
&TranslationTableBase,
&TranslationTableSize);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "Error: Failed to enable MMU\n"));
}
}
/*++
Routine Description:
Arguments:
FileHandle - Handle of the file being invoked.
PeiServices - Describes the list of possible PEI Services.
Returns:
Status - EFI_SUCCESS if the boot mode could be set
--*/
EFI_STATUS
EFIAPI
MemoryPeim (
IN EFI_PHYSICAL_ADDRESS UefiMemoryBase,
IN UINT64 UefiMemorySize
)
{
ARM_MEMORY_REGION_DESCRIPTOR *MemoryTable;
EFI_RESOURCE_ATTRIBUTE_TYPE ResourceAttributes;
UINT64 ResourceLength;
EFI_PEI_HOB_POINTERS NextHob;
EFI_PHYSICAL_ADDRESS SecureTop;
EFI_PHYSICAL_ADDRESS ResourceTop;
// Get Virtual Memory Map from the Platform Library
ArmPlatformGetVirtualMemoryMap (&MemoryTable);
SecureTop = (EFI_PHYSICAL_ADDRESS)FixedPcdGet64 (PcdSecureRegionBase) +
FixedPcdGet32 (PcdSecureRegionSize);
//
// Search for System Memory Hob that covers the secure firmware,
// and punch a hole in it
//
for (NextHob.Raw = GetHobList ();
NextHob.Raw != NULL;
NextHob.Raw = GetNextHob (EFI_HOB_TYPE_RESOURCE_DESCRIPTOR,
NextHob.Raw)) {
if ((NextHob.ResourceDescriptor->ResourceType == EFI_RESOURCE_SYSTEM_MEMORY) &&
(FixedPcdGet64 (PcdSecureRegionBase) >= NextHob.ResourceDescriptor->PhysicalStart) &&
(SecureTop <= NextHob.ResourceDescriptor->PhysicalStart +
NextHob.ResourceDescriptor->ResourceLength))
{
ResourceAttributes = NextHob.ResourceDescriptor->ResourceAttribute;
ResourceLength = NextHob.ResourceDescriptor->ResourceLength;
ResourceTop = NextHob.ResourceDescriptor->PhysicalStart + ResourceLength;
if (FixedPcdGet64 (PcdSecureRegionBase) == NextHob.ResourceDescriptor->PhysicalStart) {
//
// This region starts right at the start of the reserved region, so we
// can simply move its start pointer and reduce its length by the same
// value
//
NextHob.ResourceDescriptor->PhysicalStart += FixedPcdGet32 (PcdSecureRegionSize);
NextHob.ResourceDescriptor->ResourceLength -= FixedPcdGet32 (PcdSecureRegionSize);
} else if ((NextHob.ResourceDescriptor->PhysicalStart +
NextHob.ResourceDescriptor->ResourceLength) == SecureTop) {
//
// This region ends right at the end of the reserved region, so we
// can simply reduce its length by the size of the region.
//
NextHob.ResourceDescriptor->ResourceLength -= FixedPcdGet32 (PcdSecureRegionSize);
} else {
//
// This region covers the reserved region. So split it into two regions,
// each one touching the reserved region at either end, but not covering
// it.
//
NextHob.ResourceDescriptor->ResourceLength = FixedPcdGet64 (PcdSecureRegionBase) -
NextHob.ResourceDescriptor->PhysicalStart;
// Create the System Memory HOB for the remaining region (top of the FD)
BuildResourceDescriptorHob (EFI_RESOURCE_SYSTEM_MEMORY,
ResourceAttributes,
SecureTop,
ResourceTop - SecureTop);
}
//
// Reserve the memory space occupied by the secure firmware
//
BuildResourceDescriptorHob (EFI_RESOURCE_MEMORY_RESERVED,
0,
FixedPcdGet64 (PcdSecureRegionBase),
FixedPcdGet32 (PcdSecureRegionSize));
break;
}
NextHob.Raw = GET_NEXT_HOB (NextHob);
}
// Build Memory Allocation Hob
InitMmu (MemoryTable);
if (FeaturePcdGet (PcdPrePiProduceMemoryTypeInformationHob)) {
// Optional feature that helps prevent EFI memory map fragmentation.
BuildMemoryTypeInformationHob ();
}
return EFI_SUCCESS;
}
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