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Extract PFN management into separate module
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This commit is contained in:
Aiken Harris
2025-12-13 20:42:48 +01:00
parent 237f6a2974
commit 783a9eea3a
9 changed files with 130 additions and 149 deletions
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81
xtoskrnl/mm/mmgr.cc
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@@ -31,87 +31,6 @@ MM::Manager::InitializeMemoryManager(VOID)
DebugPrint(L"Insufficient physical pages! Install additional memory\n");
KE::Crash::Panic(0);
}
/* Proceed with architecture specific initialization */
InitializeArchitecture();
}
/**
* Scans memory descriptors provided by the boot loader.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::Manager::ScanMemoryDescriptors(VOID)
{
PLIST_ENTRY LoaderMemoryDescriptors, MemoryMappings;
PLOADER_MEMORY_DESCRIPTOR MemoryDescriptor;
PFN_NUMBER FreePages;
/* Initially, set number of free pages to 0 */
FreePages = 0;
/* Get a list of memory descriptors provided by the boot loader */
LoaderMemoryDescriptors = KE::BootInformation::GetMemoryDescriptors();
/* Iterate through memory mappings provided by the boot loader */
MemoryMappings = LoaderMemoryDescriptors->Flink;
while(MemoryMappings != LoaderMemoryDescriptors)
{
/* Get memory descriptor */
MemoryDescriptor = CONTAIN_RECORD(MemoryMappings, LOADER_MEMORY_DESCRIPTOR, ListEntry);
/* Check if memory type is invisible or cached */
if(VerifyMemoryTypeInvisible(MemoryDescriptor->MemoryType) ||
(MemoryDescriptor->MemoryType == LoaderHardwareCachedMemory))
{
/* Skip this mapping */
MemoryMappings = MemoryMappings->Flink;
continue;
}
/* Make sure that memory type is not bad */
if(MemoryDescriptor->MemoryType != LoaderBad)
{
/* Increment number of physical pages */
NumberOfPhysicalPages += MemoryDescriptor->PageCount;
}
/* Find lowest physical page */
if(MemoryDescriptor->BasePage < LowestPhysicalPage)
{
/* Update lowest physical page */
LowestPhysicalPage = MemoryDescriptor->BasePage;
}
/* Find highest physical page */
if(MemoryDescriptor->BasePage + MemoryDescriptor->PageCount > HighestPhysicalPage)
{
/* Update highest physical page */
HighestPhysicalPage = (MemoryDescriptor->BasePage + MemoryDescriptor->PageCount) - 1;
}
/* Check if memory type should be considered as free */
if(VerifyMemoryTypeFree(MemoryDescriptor->MemoryType))
{
/* Check if this descriptor contains more free pages */
if(MemoryDescriptor->PageCount >= FreePages)
{
/* Update free descriptor */
FreePages = MemoryDescriptor->PageCount;
FreeDescriptor = MemoryDescriptor;
}
}
/* Get next memory descriptor */
MemoryMappings = MemoryMappings->Flink;
}
/* Store original free descriptor */
RTL::Memory::CopyMemory(&OldFreeDescriptor, FreeDescriptor, sizeof(LOADER_MEMORY_DESCRIPTOR));
}
/** Checks whether the specified memory type should be considered as free.