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audk/MdeModulePkg/Core/RuntimeDxe/Runtime.c

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/** @file
This file implements Runtime Architectural Protocol as defined in the
Platform Initialization specification 1.0 VOLUME 2 DXE Core Interface.
This code is used to produce the EFI runtime virtual switch over
THIS IS VERY DANGEROUS CODE BE VERY CAREFUL IF YOU CHANGE IT
The transition for calling EFI Runtime functions in physical mode to calling
them in virtual mode is very very complex. Every pointer in needs to be
converted from physical mode to virtual mode. Be very careful walking linked
lists! Then to make it really hard the code it's self needs be relocated into
the new virtual address space.
So here is the concept. The code in this module will never ever be called in
virtual mode. This is the code that collects the information needed to convert
to virtual mode (DXE core registers runtime stuff with this code). Since this
code is used to fix up all runtime images, it CAN NOT fix it's self up. So some
code has to stay behind and that is us.
Also you need to be careful about when you allocate memory, as once we are in
runtime (including our EVT_SIGNAL_EXIT_BOOT_SERVICES event) you can no longer
allocate memory.
Any runtime driver that gets loaded before us will not be callable in virtual
mode. This is due to the fact that the DXE core can not register the info
needed with us. This is good, since it keeps the code in this file from
getting registered.
Revision History:
- Move the CalculateCrc32 function from Runtime Arch Protocol to Boot Service.
Runtime Arch Protocol definition no longer contains CalculateCrc32. Boot Service
Table now contains an item named CalculateCrc32.
Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "Runtime.h"
//
// Global Variables
//
EFI_MEMORY_DESCRIPTOR *mVirtualMap = NULL;
UINTN mVirtualMapDescriptorSize;
UINTN mVirtualMapMaxIndex;
VOID *mMyImageBase;
//
// The handle onto which the Runtime Architectural Protocol instance is installed
//
EFI_HANDLE mRuntimeHandle = NULL;
//
// The Runtime Architectural Protocol instance produced by this driver
//
EFI_RUNTIME_ARCH_PROTOCOL mRuntime = {
INITIALIZE_LIST_HEAD_VARIABLE (mRuntime.ImageHead),
INITIALIZE_LIST_HEAD_VARIABLE (mRuntime.EventHead),
//
// Make sure Size != sizeof (EFI_MEMORY_DESCRIPTOR). This will
// prevent people from having pointer math bugs in their code.
// now you have to use *DescriptorSize to make things work.
//
sizeof (EFI_MEMORY_DESCRIPTOR) + sizeof (UINT64) - (sizeof (EFI_MEMORY_DESCRIPTOR) % sizeof (UINT64)),
EFI_MEMORY_DESCRIPTOR_VERSION,
0,
NULL,
NULL,
FALSE,
FALSE
};
//
// Worker Functions
//
/**
Calculate the 32-bit CRC in a EFI table using the Runtime Drivers
internal function. The EFI Boot Services Table can not be used because
the EFI Boot Services Table was destroyed at ExitBootServices().
This is a internal function.
@param Hdr Pointer to an EFI standard header
**/
VOID
RuntimeDriverCalculateEfiHdrCrc (
IN OUT EFI_TABLE_HEADER *Hdr
)
{
UINT32 Crc;
Hdr->CRC32 = 0;
Crc = 0;
RuntimeDriverCalculateCrc32 ((UINT8 *)Hdr, Hdr->HeaderSize, &Crc);
Hdr->CRC32 = Crc;
}
/**
Determines the new virtual address that is to be used on subsequent memory accesses.
@param DebugDisposition Supplies type information for the pointer being converted.
@param ConvertAddress A pointer to a pointer that is to be fixed to be the value needed
for the new virtual address mappings being applied.
@retval EFI_SUCCESS The pointer pointed to by Address was modified.
@retval EFI_NOT_FOUND The pointer pointed to by Address was not found to be part
of the current memory map. This is normally fatal.
@retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
**/
EFI_STATUS
EFIAPI
RuntimeDriverConvertPointer (
IN UINTN DebugDisposition,
IN OUT VOID **ConvertAddress
)
{
UINTN Address;
UINT64 VirtEndOfRange;
EFI_MEMORY_DESCRIPTOR *VirtEntry;
UINTN Index;
//
// Make sure ConvertAddress is a valid pointer
//
if (ConvertAddress == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Get the address to convert
//
Address = (UINTN)*ConvertAddress;
//
// If this is a null pointer, return if it's allowed
//
if (Address == 0) {
if ((DebugDisposition & EFI_OPTIONAL_PTR) != 0) {
return EFI_SUCCESS;
}
return EFI_INVALID_PARAMETER;
}
VirtEntry = mVirtualMap;
for (Index = 0; Index < mVirtualMapMaxIndex; Index++) {
//
// To prevent the inclusion of 64-bit math functions a UINTN was placed in
// front of VirtEntry->NumberOfPages to cast it to a 32-bit thing on IA-32
// platforms. If you get this ASSERT remove the UINTN and do a 64-bit
// multiply.
//
ASSERT (((UINTN)VirtEntry->NumberOfPages < 0xffffffff) || (sizeof (UINTN) > 4));
if ((VirtEntry->Attribute & EFI_MEMORY_RUNTIME) == EFI_MEMORY_RUNTIME) {
if (Address >= VirtEntry->PhysicalStart) {
VirtEndOfRange = VirtEntry->PhysicalStart + (((UINTN)VirtEntry->NumberOfPages) * EFI_PAGE_SIZE);
if (Address < VirtEndOfRange) {
//
// Compute new address
//
*ConvertAddress = (VOID *)(Address - (UINTN)VirtEntry->PhysicalStart + (UINTN)VirtEntry->VirtualStart);
return EFI_SUCCESS;
}
}
}
VirtEntry = NEXT_MEMORY_DESCRIPTOR (VirtEntry, mVirtualMapDescriptorSize);
}
return EFI_NOT_FOUND;
}
/**
Determines the new virtual address that is to be used on subsequent memory accesses
for internal pointers.
This is a internal function.
@param ConvertAddress A pointer to a pointer that is to be fixed to be the value needed
for the new virtual address mappings being applied.
@retval EFI_SUCCESS The pointer pointed to by Address was modified.
@retval EFI_NOT_FOUND The pointer pointed to by Address was not found to be part
of the current memory map. This is normally fatal.
@retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
**/
EFI_STATUS
RuntimeDriverConvertInternalPointer (
IN OUT VOID **ConvertAddress
)
{
return RuntimeDriverConvertPointer (0x0, ConvertAddress);
}
/**
Changes the runtime addressing mode of EFI firmware from physical to virtual.
@param MemoryMapSize The size in bytes of VirtualMap.
@param DescriptorSize The size in bytes of an entry in the VirtualMap.
@param DescriptorVersion The version of the structure entries in VirtualMap.
@param VirtualMap An array of memory descriptors which contain new virtual
address mapping information for all runtime ranges.
@retval EFI_SUCCESS The virtual address map has been applied.
@retval EFI_UNSUPPORTED EFI firmware is not at runtime, or the EFI firmware is already in
virtual address mapped mode.
@retval EFI_INVALID_PARAMETER DescriptorSize or DescriptorVersion is invalid.
@retval EFI_NO_MAPPING A virtual address was not supplied for a range in the memory
map that requires a mapping.
@retval EFI_NOT_FOUND A virtual address was supplied for an address that is not found
in the memory map.
**/
EFI_STATUS
EFIAPI
RuntimeDriverSetVirtualAddressMap (
IN UINTN MemoryMapSize,
IN UINTN DescriptorSize,
IN UINT32 DescriptorVersion,
IN EFI_MEMORY_DESCRIPTOR *VirtualMap
)
{
EFI_STATUS Status;
EFI_RUNTIME_EVENT_ENTRY *RuntimeEvent;
EFI_RUNTIME_IMAGE_ENTRY *RuntimeImage;
LIST_ENTRY *Link;
EFI_PHYSICAL_ADDRESS VirtImageBase;
//
// Can only switch to virtual addresses once the memory map is locked down,
// and can only set it once
//
if (!mRuntime.AtRuntime || mRuntime.VirtualMode) {
return EFI_UNSUPPORTED;
}
//
// Only understand the original descriptor format
//
if ((DescriptorVersion != EFI_MEMORY_DESCRIPTOR_VERSION) || (DescriptorSize < sizeof (EFI_MEMORY_DESCRIPTOR))) {
return EFI_INVALID_PARAMETER;
}
//
// We are now committed to go to virtual mode, so lets get to it!
//
mRuntime.VirtualMode = TRUE;
//
// ConvertPointer() needs this mVirtualMap to do the conversion. So set up
// globals we need to parse the virtual address map.
//
mVirtualMapDescriptorSize = DescriptorSize;
mVirtualMapMaxIndex = MemoryMapSize / DescriptorSize;
mVirtualMap = VirtualMap;
//
// ReporstStatusCodeLib will check and make sure this service can be called in runtime mode.
//
REPORT_STATUS_CODE (EFI_PROGRESS_CODE, (EFI_SOFTWARE_EFI_RUNTIME_SERVICE | EFI_SW_RS_PC_SET_VIRTUAL_ADDRESS_MAP));
//
// Report Status Code here since EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event will be signalled.
//
REPORT_STATUS_CODE (EFI_PROGRESS_CODE, (EFI_SOFTWARE_DXE_BS_DRIVER | EFI_SW_DXE_BS_PC_VIRTUAL_ADDRESS_CHANGE_EVENT));
//
// Signal all the EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE events.
// All runtime events are stored in a list in Runtime AP.
//
for (Link = mRuntime.EventHead.ForwardLink; Link != &mRuntime.EventHead; Link = Link->ForwardLink) {
RuntimeEvent = BASE_CR (Link, EFI_RUNTIME_EVENT_ENTRY, Link);
if ((RuntimeEvent->Type & EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE) == EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE) {
//
// Work around the bug in the Platform Init specification (v1.7),
// reported as Mantis#2017: "EFI_RUNTIME_EVENT_ENTRY.Event" should have
// type EFI_EVENT, not (EFI_EVENT*). The PI spec documents the field
// correctly as "The EFI_EVENT returned by CreateEvent()", but the type
// of the field doesn't match the natural language description. Therefore
// we need an explicit cast here.
//
RuntimeEvent->NotifyFunction (
(EFI_EVENT)RuntimeEvent->Event,
RuntimeEvent->NotifyContext
);
}
}
//
// Relocate runtime images. All runtime images are stored in a list in Runtime AP.
//
for (Link = mRuntime.ImageHead.ForwardLink; Link != &mRuntime.ImageHead; Link = Link->ForwardLink) {
RuntimeImage = BASE_CR (Link, EFI_RUNTIME_IMAGE_ENTRY, Link);
//
// We don't want to relocate our selves, as we only run in physical mode.
//
if (mMyImageBase != RuntimeImage->ImageBase) {
VirtImageBase = (EFI_PHYSICAL_ADDRESS)(UINTN)RuntimeImage->ImageBase;
Status = RuntimeDriverConvertPointer (0, (VOID **)&VirtImageBase);
ASSERT_EFI_ERROR (Status);
PeCoffLoaderRelocateImageForRuntime (
(EFI_PHYSICAL_ADDRESS)(UINTN)RuntimeImage->ImageBase,
VirtImageBase,
(UINTN)RuntimeImage->ImageSize,
RuntimeImage->RelocationData
);
InvalidateInstructionCacheRange (RuntimeImage->ImageBase, (UINTN)RuntimeImage->ImageSize);
}
}
//
// Convert all the Runtime Services except ConvertPointer() and SetVirtualAddressMap()
// and recompute the CRC-32
//
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->GetTime);
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->SetTime);
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->GetWakeupTime);
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->SetWakeupTime);
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->ResetSystem);
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->GetNextHighMonotonicCount);
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->GetVariable);
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->SetVariable);
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->GetNextVariableName);
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->QueryVariableInfo);
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->UpdateCapsule);
RuntimeDriverConvertInternalPointer ((VOID **)&gRT->QueryCapsuleCapabilities);
RuntimeDriverCalculateEfiHdrCrc (&gRT->Hdr);
//
// UEFI don't require System Configuration Tables Conversion.
//
//
// Convert the runtime fields of the EFI System Table and recompute the CRC-32
//
RuntimeDriverConvertInternalPointer ((VOID **)&gST->FirmwareVendor);
RuntimeDriverConvertInternalPointer ((VOID **)&gST->ConfigurationTable);
RuntimeDriverConvertInternalPointer ((VOID **)&gST->RuntimeServices);
RuntimeDriverCalculateEfiHdrCrc (&gST->Hdr);
//
// At this point, gRT and gST are physical pointers, but the contents of these tables
// have been converted to runtime.
//
//
// mVirtualMap is only valid during SetVirtualAddressMap() call
//
mVirtualMap = NULL;
mVirtualMapMaxIndex = 0;
return EFI_SUCCESS;
}
/**
Entry Point for Runtime driver.
This function installs Runtime Architectural Protocol and registers CalculateCrc32 boot services table,
SetVirtualAddressMap & ConvertPointer runtime services table.
@param ImageHandle Image handle of this driver.
@param SystemTable a Pointer to the EFI System Table.
@retval EFI_SUCEESS Runtime Driver Architectural Protocol is successfully installed
@return Others Some error occurs when installing Runtime Driver Architectural Protocol.
**/
EFI_STATUS
EFIAPI
RuntimeDriverInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_LOADED_IMAGE_PROTOCOL *MyLoadedImage;
//
// This image needs to be excluded from relocation for virtual mode, so cache
// a copy of the Loaded Image protocol to test later.
//
Status = gBS->HandleProtocol (
ImageHandle,
&gEfiLoadedImageProtocolGuid,
(VOID **)&MyLoadedImage
);
ASSERT_EFI_ERROR (Status);
mMyImageBase = MyLoadedImage->ImageBase;
//
// Fill in the entries of the EFI Boot Services and EFI Runtime Services Tables
//
gBS->CalculateCrc32 = RuntimeDriverCalculateCrc32;
gRT->SetVirtualAddressMap = RuntimeDriverSetVirtualAddressMap;
gRT->ConvertPointer = RuntimeDriverConvertPointer;
//
// Install the Runtime Architectural Protocol onto a new handle
//
Status = gBS->InstallMultipleProtocolInterfaces (
&mRuntimeHandle,
&gEfiRuntimeArchProtocolGuid,
&mRuntime,
NULL
);
ASSERT_EFI_ERROR (Status);
return Status;
}
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