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/** @file
* High memory node enumeration DXE driver for ARM Virtual Machines
*
* Copyright (c) 2015-2016, Linaro Ltd. 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 <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/DxeServicesTableLib.h>
#include <Library/PcdLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/FdtClient.h>
EFI_STATUS
EFIAPI
InitializeHighMemDxe (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
FDT_CLIENT_PROTOCOL *FdtClient;
EFI_STATUS Status, FindNodeStatus;
INT32 Node;
CONST UINT32 *Reg;
UINT32 RegSize;
UINTN AddressCells, SizeCells;
UINT64 CurBase;
UINT64 CurSize;
UINT64 Attributes;
Status = gBS->LocateProtocol (&gFdtClientProtocolGuid, NULL,
(VOID **)&FdtClient);
ASSERT_EFI_ERROR (Status);
//
// Check for memory node and add the memory spaces except the lowest one
//
for (FindNodeStatus = FdtClient->FindMemoryNodeReg (FdtClient, &Node,
(CONST VOID **) &Reg, &AddressCells,
&SizeCells, &RegSize);
!EFI_ERROR (FindNodeStatus);
FindNodeStatus = FdtClient->FindNextMemoryNodeReg (FdtClient, Node,
&Node, (CONST VOID **) &Reg, &AddressCells,
&SizeCells, &RegSize)) {
ASSERT (AddressCells <= 2);
ASSERT (SizeCells <= 2);
while (RegSize > 0) {
CurBase = SwapBytes32 (*Reg++);
if (AddressCells > 1) {
CurBase = (CurBase << 32) | SwapBytes32 (*Reg++);
}
CurSize = SwapBytes32 (*Reg++);
if (SizeCells > 1) {
CurSize = (CurSize << 32) | SwapBytes32 (*Reg++);
}
RegSize -= (AddressCells + SizeCells) * sizeof (UINT32);
if (PcdGet64 (PcdSystemMemoryBase) != CurBase) {
Status = gDS->AddMemorySpace (EfiGcdMemoryTypeSystemMemory, CurBase,
CurSize, EFI_MEMORY_WB);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR,
"%a: Failed to add System RAM @ 0x%lx - 0x%lx (%r)\n",
__FUNCTION__, CurBase, CurBase + CurSize - 1, Status));
continue;
}
//
// Take care not to strip any permission attributes that will have been
// set by DxeCore on the region we just added if a strict permission
// policy is in effect for EfiConventionalMemory regions.
// Unfortunately, we cannot interrogate the GCD memory space map for
// those permissions, since they are not recorded there (for historical
// reasons), so check the policy directly.
//
Attributes = EFI_MEMORY_WB;
if ((PcdGet64 (PcdDxeNxMemoryProtectionPolicy) &
(1U << (UINT32)EfiConventionalMemory)) != 0) {
Attributes |= EFI_MEMORY_XP;
}
Status = gDS->SetMemorySpaceAttributes (CurBase, CurSize, Attributes);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR,
"%a: Failed to set System RAM @ 0x%lx - 0x%lx attribute (%r)\n",
__FUNCTION__, CurBase, CurBase + CurSize - 1, Status));
} else {
DEBUG ((EFI_D_INFO, "%a: Add System RAM @ 0x%lx - 0x%lx\n",
__FUNCTION__, CurBase, CurBase + CurSize - 1));
}
}
}
}
return EFI_SUCCESS;
}
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