> On Apr 23, 2015, at 7:31 PM, Haojian Zhuang <[email protected]> wrote:
>
>
> 在 2015/4/24 10:25, Haojian Zhuang 写道:
>>
>> 在 2015/4/24 10:03, Yao, Jiewen 写道:
>>> Hi Haojian
>>> Thanks for the sharing.
>>>
>>> May I know if you have validated variable set in UEFI runtime?
>>> I found it is marked as DXE driver instead of RUNTIME driver. But
>>> maybe I am wrong.
>>>
>> Yes, you'r right. I only verified it as DXE driver. I'll try to access
>> it for RUNTIME case. Thanks for reminder.
>>
> When I try to use RUNTIME service, I should reserve UEFI memory in linux
> kernel. How could I know how much memory should I reserve? What's the
> start address?
>
You don’t need to reserve memory. You allocate memory of a type that lives into
UEFI runtime. If you allocate EfiRuntimeServicesData at EFI time that memory is
never given to the OS.
Also to be a runtime driver you must support being called by the OS with a
virtual mapping provided by the OS. In the Variable driver the
VariableClassAddressChangeEvent() function converts the variable drivers
pointers to the virtual mapping given by the OS (or the OS loader).
https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableDxe.c
/**
Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.
This is a notification function registered on
EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.
It convers pointer to new virtual address.
@param Event Event whose notification function is being invoked.
@param Context Pointer to the notification function's context.
**/
VOID
EFIAPI
VariableClassAddressChangeEvent (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
UINTN Index;
EfiConvertPointer (0x0, (VOID **)
&mVariableModuleGlobal->FvbInstance->GetBlockSize);
EfiConvertPointer (0x0, (VOID **)
&mVariableModuleGlobal->FvbInstance->GetPhysicalAddress);
EfiConvertPointer (0x0, (VOID **)
&mVariableModuleGlobal->FvbInstance->GetAttributes);
EfiConvertPointer (0x0, (VOID **)
&mVariableModuleGlobal->FvbInstance->SetAttributes);
EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->FvbInstance->Read);
EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->FvbInstance->Write);
EfiConvertPointer (0x0, (VOID **)
&mVariableModuleGlobal->FvbInstance->EraseBlocks);
EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->FvbInstance);
EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->PlatformLangCodes);
EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->LangCodes);
EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->PlatformLang);
EfiConvertPointer (0x0, (VOID **)
&mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase);
EfiConvertPointer (0x0, (VOID **)
&mVariableModuleGlobal->VariableGlobal.VolatileVariableBase);
EfiConvertPointer (0x0, (VOID **)
&mVariableModuleGlobal->VariableGlobal.HobVariableBase);
EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal);
EfiConvertPointer (0x0, (VOID **) &mNvVariableCache);
EfiConvertPointer (0x0, (VOID **) &mHandlerTable);
for (Index = 0; Index < mNumberOfHandler; Index++) {
EfiConvertPointer (0x0, (VOID **) &mHandlerTable[Index]);
}
Status = EfiConvertList (0x0, &mLockedVariableList);
ASSERT_EFI_ERROR (Status);
Status = EfiConvertList (0x0, &mVarCheckVariableList);
ASSERT_EFI_ERROR (Status);
}
Thanks,
Andrew Fish
https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg/Include/Uefi/UefiMultiPhase.h
///
/// Enumeration of memory types introduced in UEFI.
///
typedef enum {
///
/// Not used.
///
EfiReservedMemoryType,
///
/// The code portions of a loaded application.
/// (Note that UEFI OS loaders are UEFI applications.)
///
EfiLoaderCode,
///
/// The data portions of a loaded application and the default data allocation
/// type used by an application to allocate pool memory.
///
EfiLoaderData,
///
/// The code portions of a loaded Boot Services Driver.
///
EfiBootServicesCode,
///
/// The data portions of a loaded Boot Serves Driver, and the default data
/// allocation type used by a Boot Services Driver to allocate pool memory.
///
EfiBootServicesData,
///
/// The code portions of a loaded Runtime Services Driver.
///
EfiRuntimeServicesCode,
///
/// The data portions of a loaded Runtime Services Driver and the default
/// data allocation type used by a Runtime Services Driver to allocate pool
memory.
///
EfiRuntimeServicesData,
///
/// Free (unallocated) memory.
///
EfiConventionalMemory,
///
/// Memory in which errors have been detected.
///
EfiUnusableMemory,
///
/// Memory that holds the ACPI tables.
///
EfiACPIReclaimMemory,
///
/// Address space reserved for use by the firmware.
///
EfiACPIMemoryNVS,
///
/// Used by system firmware to request that a memory-mapped IO region
/// be mapped by the OS to a virtual address so it can be accessed by EFI
runtime services.
///
EfiMemoryMappedIO,
///
/// System memory-mapped IO region that is used to translate memory
/// cycles to IO cycles by the processor.
///
EfiMemoryMappedIOPortSpace,
///
/// Address space reserved by the firmware for code that is part of the
processor.
///
EfiPalCode,
EfiMaxMemoryType
} EFI_MEMORY_TYPE;
> Best Regards
> Haojian
>
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