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/** @file
This module sets default policy for attributes of EfiACPIMemoryNVS and EfiReservedMemoryType.
This module sets EFI_MEMORY_XP for attributes of EfiACPIMemoryNVS and EfiReservedMemoryType
in UEFI memory map, if and only of PropertiesTable is published and has BIT0 set.
Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
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 <Uefi.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/DxeServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Guid/EventGroup.h>
#include <Guid/PropertiesTable.h>
/**
Converts a number of EFI_PAGEs to a size in bytes.
NOTE: Do not use EFI_PAGES_TO_SIZE because it handles UINTN only.
@param Pages The number of EFI_PAGES.
@return The number of bytes associated with the number of EFI_PAGEs specified
by Pages.
**/
UINT64
EfiPagesToSize (
IN UINT64 Pages
)
{
return LShiftU64 (Pages, EFI_PAGE_SHIFT);
}
/**
Set memory attributes according to default policy.
@param MemoryMap A pointer to the buffer in which firmware places the current memory map.
@param MemoryMapSize Size, in bytes, of the MemoryMap buffer.
@param DescriptorSize size, in bytes, of an individual EFI_MEMORY_DESCRIPTOR.
**/
VOID
SetMemorySpaceAttributesDefault (
IN EFI_MEMORY_DESCRIPTOR *MemoryMap,
IN UINTN MemoryMapSize,
IN UINTN DescriptorSize
)
{
EFI_MEMORY_DESCRIPTOR *MemoryMapEntry;
EFI_MEMORY_DESCRIPTOR *MemoryMapEnd;
EFI_STATUS Status;
DEBUG ((EFI_D_INFO, "SetMemorySpaceAttributesDefault\n"));
MemoryMapEntry = MemoryMap;
MemoryMapEnd = (EFI_MEMORY_DESCRIPTOR *) ((UINT8 *) MemoryMap + MemoryMapSize);
while ((UINTN)MemoryMapEntry < (UINTN)MemoryMapEnd) {
if (MemoryMapEntry->PhysicalStart < BASE_1MB) {
//
// Do not touch memory space below 1MB
//
MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);
continue;
}
switch (MemoryMapEntry->Type) {
case EfiRuntimeServicesCode:
case EfiRuntimeServicesData:
//
// should be handled later;
//
break;
case EfiReservedMemoryType:
case EfiACPIMemoryNVS:
//
// Handle EfiReservedMemoryType and EfiACPIMemoryNVS, because there might be firmware executable there.
//
DEBUG ((EFI_D_INFO, "SetMemorySpaceAttributes - %016lx - %016lx (%016lx) ...\n",
MemoryMapEntry->PhysicalStart,
MemoryMapEntry->PhysicalStart + EfiPagesToSize (MemoryMapEntry->NumberOfPages),
MemoryMapEntry->Attribute
));
Status = gDS->SetMemorySpaceCapabilities (
MemoryMapEntry->PhysicalStart,
EfiPagesToSize (MemoryMapEntry->NumberOfPages),
MemoryMapEntry->Attribute | EFI_MEMORY_XP
);
DEBUG ((EFI_D_INFO, "SetMemorySpaceCapabilities - %r\n", Status));
break;
}
MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);
}
return ;
}
/**
Update memory attributes according to default policy.
@param[in] Event The Event this notify function registered to.
@param[in] Context Pointer to the context data registered to the Event.
**/
VOID
EFIAPI
UpdateMemoryAttributesDefault (
EFI_EVENT Event,
VOID *Context
)
{
EFI_STATUS Status;
EFI_MEMORY_DESCRIPTOR *MemoryMap;
UINTN MemoryMapSize;
UINTN MapKey;
UINTN DescriptorSize;
UINT32 DescriptorVersion;
EFI_PROPERTIES_TABLE *PropertiesTable;
DEBUG ((EFI_D_INFO, "UpdateMemoryAttributesDefault\n"));
Status = EfiGetSystemConfigurationTable (&gEfiPropertiesTableGuid, (VOID **) &PropertiesTable);
if (EFI_ERROR (Status)) {
goto Done;
}
ASSERT (PropertiesTable != NULL);
DEBUG ((EFI_D_INFO, "MemoryProtectionAttribute - 0x%016lx\n", PropertiesTable->MemoryProtectionAttribute));
if ((PropertiesTable->MemoryProtectionAttribute & EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA) == 0) {
goto Done;
}
//
// Get the EFI memory map.
//
MemoryMapSize = 0;
MemoryMap = NULL;
Status = gBS->GetMemoryMap (
&MemoryMapSize,
MemoryMap,
&MapKey,
&DescriptorSize,
&DescriptorVersion
);
ASSERT (Status == EFI_BUFFER_TOO_SMALL);
do {
MemoryMap = (EFI_MEMORY_DESCRIPTOR *) AllocatePool (MemoryMapSize);
ASSERT (MemoryMap != NULL);
Status = gBS->GetMemoryMap (
&MemoryMapSize,
MemoryMap,
&MapKey,
&DescriptorSize,
&DescriptorVersion
);
if (EFI_ERROR (Status)) {
FreePool (MemoryMap);
}
} while (Status == EFI_BUFFER_TOO_SMALL);
ASSERT_EFI_ERROR (Status);
SetMemorySpaceAttributesDefault (MemoryMap, MemoryMapSize, DescriptorSize);
Done:
gBS->CloseEvent (Event);
return ;
}
/**
The entrypoint of properties table attribute driver.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS It always returns EFI_SUCCESS.
**/
EFI_STATUS
EFIAPI
InitializePropertiesTableAttributesDxe (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_EVENT ReadyToBootEvent;
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_CALLBACK,
UpdateMemoryAttributesDefault,
NULL,
&gEfiEventReadyToBootGuid,
&ReadyToBootEvent
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
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