77 lines
2.1 KiB
C++
77 lines
2.1 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/mm/mmgr.cc
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* DESCRIPTION: Memory Manager
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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* Aiken Harris <harraiken91@gmail.com>
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*/
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#include <xtos.hh>
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/**
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* Performs an early initialization of the XTOS Memory Manager.
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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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MM::Manager::InitializeMemoryManager(VOID)
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{
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/* Scan memory descriptors provided by the boot loader */
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MM::Pfn::ScanMemoryDescriptors();
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/* Check if there are enough physical pages */
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if(MM::Pfn::GetNumberOfPhysicalPages() < MM_MINIMUM_PHYSICAL_PAGES)
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{
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/* Insufficient physical pages, kernel panic */
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DebugPrint(L"Insufficient physical pages! Install additional memory\n");
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KE::Crash::Panic(0);
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}
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/* Compute allocation size for the PFN database */
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MM::Pfn::ComputePfnDatabaseSize();
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}
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/**
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* Checks whether the specified memory type should be considered as free.
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*
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* @param MemoryType
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* Specifies the memory type to verify.
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*
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* @return This routine returns TRUE if the specified memory type should be considered as free, or FALSE otherwise.
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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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BOOLEAN
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MM::Manager::VerifyMemoryTypeFree(LOADER_MEMORY_TYPE MemoryType)
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{
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return ((MemoryType == LoaderFirmwareTemporary) ||
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(MemoryType == LoaderFree) ||
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(MemoryType == LoaderLoadedProgram) ||
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(MemoryType == LoaderOsloaderStack));
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}
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/**
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* Checks whether the specified memory type should be considered as invisible for the memory manager.
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*
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* @param MemoryType
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* Specifies the memory type to verify.
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*
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* @return This routine returns TRUE if the specified memory type should be considered as invisible, or FALSE otherwise.
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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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BOOLEAN
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MM::Manager::VerifyMemoryTypeInvisible(LOADER_MEMORY_TYPE MemoryType)
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{
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return ((MemoryType == LoaderBBTMemory) ||
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(MemoryType == LoaderFirmwarePermanent) ||
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(MemoryType == LoaderSpecialMemory));
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}
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