128 lines
4.6 KiB
C
128 lines
4.6 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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* SPDX-License-Identifier: BSD-2-Clause-Patent
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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/Cpu.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_CPU_ARCH_PROTOCOL *Cpu;
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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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EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;
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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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Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL,
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(VOID **)&Cpu);
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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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Status = gDS->GetMemorySpaceDescriptor (CurBase, &GcdDescriptor);
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if (EFI_ERROR (Status)) {
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DEBUG ((DEBUG_WARN,
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"%a: Region 0x%lx - 0x%lx not found in the GCD memory space map\n",
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__FUNCTION__, CurBase, CurBase + CurSize - 1));
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continue;
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}
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if (GcdDescriptor.GcdMemoryType == EfiGcdMemoryTypeNonExistent) {
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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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Status = gDS->SetMemorySpaceAttributes (CurBase, CurSize,
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EFI_MEMORY_WB);
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if (EFI_ERROR (Status)) {
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DEBUG ((DEBUG_WARN,
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"%a: gDS->SetMemorySpaceAttributes() failed on region 0x%lx - 0x%lx (%r)\n",
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__FUNCTION__, CurBase, CurBase + CurSize - 1, Status));
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}
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//
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// Due to the ambiguous nature of the RO/XP GCD memory space attributes,
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// it is impossible to add a memory space with the XP attribute in a way
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// that does not result in the XP attribute being set on *all* UEFI
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// memory map entries that are carved from it, including code regions
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// that require executable permissions.
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//
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// So instead, we never set the RO/XP attributes in the GCD memory space
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// capabilities or attribute fields, and apply any protections directly
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// on the page table mappings by going through the cpu arch protocol.
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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 = Cpu->SetMemoryAttributes (Cpu, 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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