mirror of https://github.com/acidanthera/audk.git
111 lines
3.9 KiB
C
111 lines
3.9 KiB
C
/** @file
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* High memory node enumeration DXE driver for ARM Virtual Machines
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*
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* Copyright (c) 2015-2016, Linaro Ltd. All rights reserved.
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*
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* This program and the accompanying materials are licensed and made available
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* under the terms and conditions of the BSD License which accompanies this
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* distribution. The full text of the license may be found at
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* http://opensource.org/licenses/bsd-license.php
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*
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* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR
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* IMPLIED.
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*
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**/
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/DxeServicesTableLib.h>
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#include <Library/PcdLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Protocol/FdtClient.h>
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EFI_STATUS
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EFIAPI
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InitializeHighMemDxe (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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FDT_CLIENT_PROTOCOL *FdtClient;
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EFI_STATUS Status, FindNodeStatus;
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INT32 Node;
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CONST UINT32 *Reg;
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UINT32 RegSize;
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UINTN AddressCells, SizeCells;
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UINT64 CurBase;
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UINT64 CurSize;
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UINT64 Attributes;
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Status = gBS->LocateProtocol (&gFdtClientProtocolGuid, NULL,
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(VOID **)&FdtClient);
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ASSERT_EFI_ERROR (Status);
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//
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// Check for memory node and add the memory spaces except the lowest one
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//
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for (FindNodeStatus = FdtClient->FindMemoryNodeReg (FdtClient, &Node,
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(CONST VOID **) &Reg, &AddressCells,
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&SizeCells, &RegSize);
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!EFI_ERROR (FindNodeStatus);
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FindNodeStatus = FdtClient->FindNextMemoryNodeReg (FdtClient, Node,
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&Node, (CONST VOID **) &Reg, &AddressCells,
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&SizeCells, &RegSize)) {
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ASSERT (AddressCells <= 2);
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ASSERT (SizeCells <= 2);
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while (RegSize > 0) {
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CurBase = SwapBytes32 (*Reg++);
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if (AddressCells > 1) {
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CurBase = (CurBase << 32) | SwapBytes32 (*Reg++);
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}
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CurSize = SwapBytes32 (*Reg++);
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if (SizeCells > 1) {
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CurSize = (CurSize << 32) | SwapBytes32 (*Reg++);
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}
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RegSize -= (AddressCells + SizeCells) * sizeof (UINT32);
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if (PcdGet64 (PcdSystemMemoryBase) != CurBase) {
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Status = gDS->AddMemorySpace (EfiGcdMemoryTypeSystemMemory, CurBase,
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CurSize, EFI_MEMORY_WB);
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if (EFI_ERROR (Status)) {
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DEBUG ((EFI_D_ERROR,
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"%a: Failed to add System RAM @ 0x%lx - 0x%lx (%r)\n",
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__FUNCTION__, CurBase, CurBase + CurSize - 1, Status));
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continue;
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}
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//
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// Take care not to strip any permission attributes that will have been
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// set by DxeCore on the region we just added if a strict permission
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// policy is in effect for EfiConventionalMemory regions.
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// Unfortunately, we cannot interrogate the GCD memory space map for
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// those permissions, since they are not recorded there (for historical
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// reasons), so check the policy directly.
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//
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Attributes = EFI_MEMORY_WB;
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if ((PcdGet64 (PcdDxeNxMemoryProtectionPolicy) &
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(1U << (UINT32)EfiConventionalMemory)) != 0) {
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Attributes |= EFI_MEMORY_XP;
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}
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Status = gDS->SetMemorySpaceAttributes (CurBase, CurSize, Attributes);
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if (EFI_ERROR (Status)) {
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DEBUG ((EFI_D_ERROR,
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"%a: Failed to set System RAM @ 0x%lx - 0x%lx attribute (%r)\n",
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__FUNCTION__, CurBase, CurBase + CurSize - 1, Status));
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} else {
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DEBUG ((EFI_D_INFO, "%a: Add System RAM @ 0x%lx - 0x%lx\n",
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__FUNCTION__, CurBase, CurBase + CurSize - 1));
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}
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}
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}
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}
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return EFI_SUCCESS;
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}
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