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Enumerations
enum	NHLTQueryRevision { NHLTRev1 = 1 }

enum	NHLTQuery { NHLTSupportQuery = 0 , NHLTMemoryAddress }

Functions
NTSTATUS	NHLTCheckSupported (_In_ WDFDEVICE FxDevice)

NTSTATUS	NHLTQueryTableAddress (_In_ WDFDEVICE FxDevice, UINT64 nhltAddr, UINT64 nhltSz)

Enumeration Type Documentation

◆ NHLTQuery

enum NHLTQuery

Enumerator
NHLTSupportQuery
NHLTMemoryAddress

Definition at line 5 of file nhlt.h.

               {
    NHLTSupportQuery = 0,
    NHLTMemoryAddress
};

◆ NHLTQueryRevision

enum NHLTQueryRevision

Enumerator
NHLTRev1

Definition at line 1 of file nhlt.h.

                       {
    NHLTRev1 = 1
};

Function Documentation

◆ NHLTCheckSupported()

NTSTATUS NHLTCheckSupported ( _In_ WDFDEVICE FxDevice )

Definition at line 146 of file nhlt.cpp.

                                                     {
    WDFMEMORY outputBufferMemory;
    NTSTATUS status = NHLTQuery(FxDevice, NHLTRev1, NHLTSupportQuery, &outputBufferMemory);
    if (!NT_SUCCESS(status)) {
        return status;
    }
    if (!outputBufferMemory) {
        return STATUS_NO_MEMORY;
    }
 
    PACPI_EVAL_OUTPUT_BUFFER outputBuffer = (PACPI_EVAL_OUTPUT_BUFFER)WdfMemoryGetBuffer(outputBufferMemory, NULL);
    if (outputBuffer->Count < 1) {
        status = STATUS_INVALID_DEVICE_OBJECT_PARAMETER;
        goto end;
    }
 
    {
    PACPI_METHOD_ARGUMENT argument = outputBuffer->Argument;
 
    UCHAR supportedQueries = argument->Data[0];
 
    if ((supportedQueries & 0x3) == 0) {
        status = STATUS_NOT_SUPPORTED;
    }
    }
 
end:
    if (outputBufferMemory != NULL) {
        WdfObjectDelete(outputBufferMemory);
        outputBufferMemory = NULL;
    }
    return status;
}

Referenced by Fdo_EvtDevicePrepareHardware().

◆ NHLTQueryTableAddress()

NTSTATUS NHLTQueryTableAddress	(	_In_ WDFDEVICE	FxDevice,
		UINT64 *	nhltAddr,
		UINT64 *	nhltSz
	)

Definition at line 182 of file nhlt.cpp.

                                                                                          {
    WDFMEMORY outputBufferMemory;
    NTSTATUS status = NHLTQuery(FxDevice, NHLTRev1, NHLTMemoryAddress, &outputBufferMemory);
    if (!NT_SUCCESS(status)) {
        return status;
    }
    if (!outputBufferMemory) {
        return STATUS_NO_MEMORY;
    }
 
    PACPI_EVAL_OUTPUT_BUFFER outputBuffer = (PACPI_EVAL_OUTPUT_BUFFER)WdfMemoryGetBuffer(outputBufferMemory, NULL);
    if (outputBuffer->Count < 1) {
        status = STATUS_INVALID_DEVICE_OBJECT_PARAMETER;
        goto end;
    }
 
    {
    PACPI_METHOD_ARGUMENT argument = outputBuffer->Argument;
 
    UINT8* res = argument->Data;
    UINT32 sz = argument->DataLength;
 
    *nhltAddr = 0;
    *nhltSz = 0;
    parseACPI(res, 0, sz, nhltAddr, nhltSz);
    }
 
    if (nhltAddr == 0 || nhltSz == 0) {
        status = STATUS_UNSUCCESSFUL;
    }
 
end:
    if (outputBufferMemory != NULL) {
        WdfObjectDelete(outputBufferMemory);
        outputBufferMemory = NULL;
    }
    return status;
}