130 lines
3.9 KiB
C++
130 lines
3.9 KiB
C++
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/ke/shdata.cc
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* DESCRIPTION: Kernel Shared Data
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* DEVELOPERS: Aiken Harris <harraiken91@gmail.com>
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*/
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#include <xtos.hh>
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/**
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* Retrieves a pointer to the memory-mapped Kernel Shared Data.
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*
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* @return This routine returns a pointer to the KSHARED_DATA structure.
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*
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* @since XT 1.0
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*/
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XTAPI
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PKSHARED_DATA
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KE::SharedData::GetKernelSharedData(VOID)
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{
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/* Return the internally managed pointer */
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return KernelSharedData;
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}
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/**
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* Retrieves the current system time using a lock-free read mechanism.
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*
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* @return This routine returns a LARGE_INTEGER containing the system time.
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*
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* @since XT 1.0
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*/
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XTAPI
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LARGE_INTEGER
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KE::SharedData::GetSystemTime(VOID)
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{
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LARGE_INTEGER CurrentTime;
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/* Initialize to zero */
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CurrentTime.QuadPart = 0;
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/* Perform a lock-free read sequence */
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do
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{
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/* Read the primary high part and low part */
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CurrentTime.HighPart = KernelSharedData->SystemTime.High1Part;
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CurrentTime.LowPart = KernelSharedData->SystemTime.LowPart;
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}
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while(CurrentTime.HighPart != KernelSharedData->SystemTime.High2Part);
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/* Return the 64-bit time */
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return CurrentTime;
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}
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/**
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* Maps and initializes the Kernel Shared Data (KSD) structure.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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KE::SharedData::InitializeKernelSharedData(VOID)
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{
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PCSTR SourceString;
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XTSTATUS Status;
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/* Map Kernel Shared Data (KSD) */
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Status = MM::Manager::MapKernelSharedData();
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if(Status != STATUS_SUCCESS)
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{
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/* Failed to map KSD, raise kernel panic */
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KE::Crash::Panic(0);
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}
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/* Bind the pointer to the architectural virtual address */
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KernelSharedData = (PKSHARED_DATA)MM_KERNEL_SHARED_DATA_ADDRESS;
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/* Populate numeric version identifiers */
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KernelSharedData->XtMajorVersion = XTOS_VERSION_MAJOR;
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KernelSharedData->XtMinorVersion = XTOS_VERSION_MINOR;
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/* Convert and copy system build string */
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SourceString = XTOS_VERSION_BUILD;
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RTL::String::StringToWideString(KernelSharedData->XtBuild, (PCSTR*)&SourceString,
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(sizeof(KernelSharedData->XtBuild) / sizeof(WCHAR)) - 1);
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/* Convert and copy system build hash string */
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SourceString = XTOS_VERSION_HASH;
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RTL::String::StringToWideString(KernelSharedData->XtBuildHash, (PCSTR*)&SourceString,
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(sizeof(KernelSharedData->XtBuildHash) / sizeof(WCHAR)) - 1);
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/* Convert and copy system architecture string */
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SourceString = XTOS_VERSION_ARCH;
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RTL::String::StringToWideString(KernelSharedData->XtArchitecture, (PCSTR*)&SourceString,
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(sizeof(KernelSharedData->XtArchitecture) / sizeof(WCHAR)) - 1);
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/* Convert and copy system build date string */
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SourceString = XTOS_VERSION_DATE;
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RTL::String::StringToWideString(KernelSharedData->XtDate, (PCSTR*)&SourceString,
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(sizeof(KernelSharedData->XtDate) / sizeof(WCHAR)) - 1);
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/* Convert and copy system build full date string */
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SourceString = XTOS_VERSION_FULLDATE;
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RTL::String::StringToWideString(KernelSharedData->XtFullDate, (PCSTR*)&SourceString,
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(sizeof(KernelSharedData->XtFullDate) / sizeof(WCHAR)) - 1);
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}
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/**
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* Updates the global system time using a strict lock-free write mechanism.
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*
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* @param Time
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* Supplies the new system time as a 64-bit LARGE_INTEGER value.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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KE::SharedData::SetSystemTime(IN LARGE_INTEGER Time)
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{
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/* Set the new system time */
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KernelSharedData->SystemTime.High2Part = Time.HighPart;
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KernelSharedData->SystemTime.LowPart = Time.LowPart;
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KernelSharedData->SystemTime.High1Part = Time.HighPart;
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}
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