f2509d6d3e
In general, on an ARM system, mapping normal memory as device memory may have unintended side effects, given that unaligned accesses or loads and stores with special semantics (e.g., load/store exclusive) may fault or may not work as expected. Under KVM, the situation is even worse, since the host may not expect the guest to perform uncached accesses, and so writes to such an uncached region may get lost completely. Since the only safe mapping type under KVM is EFI_MEMORY_WB, remove all other memory type attributes. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
/** @file
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*
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* Copyright (c) 2011-2014, ARM Limited. All rights reserved.
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* Copyright (c) 2014, Linaro Limited. All rights reserved.
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*
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* This program and the accompanying materials
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* are licensed and made available under the terms and conditions of the BSD License
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* which accompanies this 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 IMPLIED.
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*
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**/
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#include <PiPei.h>
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#include <Library/ArmMmuLib.h>
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#include <Library/ArmPlatformLib.h>
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/PcdLib.h>
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#include <Library/CacheMaintenanceLib.h>
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VOID
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BuildMemoryTypeInformationHob (
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VOID
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);
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VOID
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InitMmu (
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VOID
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)
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{
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ARM_MEMORY_REGION_DESCRIPTOR *MemoryTable;
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VOID *TranslationTableBase;
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UINTN TranslationTableSize;
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RETURN_STATUS Status;
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// Get Virtual Memory Map from the Platform Library
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ArmPlatformGetVirtualMemoryMap (&MemoryTable);
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//Note: Because we called PeiServicesInstallPeiMemory() before to call InitMmu() the MMU Page Table resides in
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// DRAM (even at the top of DRAM as it is the first permanent memory allocation)
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Status = ArmConfigureMmu (MemoryTable, &TranslationTableBase, &TranslationTableSize);
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if (EFI_ERROR (Status)) {
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DEBUG ((EFI_D_ERROR, "Error: Failed to enable MMU\n"));
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}
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}
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EFI_STATUS
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EFIAPI
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MemoryPeim (
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IN EFI_PHYSICAL_ADDRESS UefiMemoryBase,
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IN UINT64 UefiMemorySize
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)
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{
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EFI_RESOURCE_ATTRIBUTE_TYPE ResourceAttributes;
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UINT64 SystemMemoryTop;
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// Ensure PcdSystemMemorySize has been set
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ASSERT (PcdGet64 (PcdSystemMemorySize) != 0);
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//
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// Now, the permanent memory has been installed, we can call AllocatePages()
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//
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ResourceAttributes = (
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EFI_RESOURCE_ATTRIBUTE_PRESENT |
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EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
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EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE |
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EFI_RESOURCE_ATTRIBUTE_TESTED
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);
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SystemMemoryTop = PcdGet64 (PcdSystemMemoryBase) +
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PcdGet64 (PcdSystemMemorySize);
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if (SystemMemoryTop - 1 > MAX_ADDRESS) {
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BuildResourceDescriptorHob (
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EFI_RESOURCE_SYSTEM_MEMORY,
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ResourceAttributes,
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PcdGet64 (PcdSystemMemoryBase),
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(UINT64)MAX_ADDRESS - PcdGet64 (PcdSystemMemoryBase) + 1
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);
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BuildResourceDescriptorHob (
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EFI_RESOURCE_SYSTEM_MEMORY,
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ResourceAttributes,
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(UINT64)MAX_ADDRESS + 1,
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SystemMemoryTop - MAX_ADDRESS - 1
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);
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} else {
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BuildResourceDescriptorHob (
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EFI_RESOURCE_SYSTEM_MEMORY,
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ResourceAttributes,
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PcdGet64 (PcdSystemMemoryBase),
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PcdGet64 (PcdSystemMemorySize)
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);
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}
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//
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// When running under virtualization, the PI/UEFI memory region may be
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// clean but not invalidated in system caches or in lower level caches
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// on other CPUs. So invalidate the region by virtual address, to ensure
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// that the contents we put there with the caches and MMU off will still
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// be visible after turning them on.
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//
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InvalidateDataCacheRange ((VOID*)(UINTN)UefiMemoryBase, UefiMemorySize);
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// Build Memory Allocation Hob
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InitMmu ();
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if (FeaturePcdGet (PcdPrePiProduceMemoryTypeInformationHob)) {
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// Optional feature that helps prevent EFI memory map fragmentation.
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BuildMemoryTypeInformationHob ();
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}
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return EFI_SUCCESS;
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}
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