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Introduce kernel virtual memory layout
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This commit is contained in:
Aiken Harris
2025-12-14 15:35:24 +01:00
parent 5224dc315f
commit 070c508e42
4 changed files with 80 additions and 1 deletions
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61
xtoskrnl/mm/mmgr.cc
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@@ -10,6 +10,64 @@
#include <xtos.hh>
/**
* Retrieves a pointer to the system's virtual memory layout structure.
*
* @return This routine returns a pointer to the memory layout structure.
*
* @since XT 1.0
*/
XTAPI
PMMMEMORY_LAYOUT
MM::Manager::GetMemoryLayout(VOID)
{
/* Return a pointer to the global memory layout structure */
return &MemoryLayout;
}
/**
* Initializes the kernel's virtual memory layout.
*
* @return This routine does not return any value.
*
* @since XT 1.0
*/
XTAPI
VOID
MM::Manager::InitializeMemoryLayout(VOID)
{
ULONG_PTR PagedPoolSize, PteCount;
PFN_NUMBER PfnDatabaseSize;
/* Calculate size of paged pool (at least 32MiB) */
PteCount = ((SIZE_TO_PAGES(33554432) + (MM_PTE_PER_PAGE - 1)) / MM_PTE_PER_PAGE);
PagedPoolSize = PteCount * MM_PTE_PER_PAGE * MM_PAGE_SIZE;
/* Retrieve the PFN database size */
PfnDatabaseSize = MM::Pfn::GetPfnDatabaseSize();
if(MM::Paging::GetXpaStatus())
{
MemoryLayout.PfnDatabaseAddress = (PMMPFN)0xFFFEFA8000000000ULL;
MemoryLayout.SelfMapAddress = (PVOID)0xFFEDF6FB7DBEDF68ULL;
MemoryLayout.NonPagedPoolStart = (PVOID)((ULONG_PTR)MemoryLayout.PfnDatabaseAddress + PfnDatabaseSize * MM_PAGE_SIZE);
MemoryLayout.NonPagedPoolEnd = (PVOID)0xFFFEFFFFFFBFFFFFULL;
MemoryLayout.PagedPoolStart = (PVOID)0xFFFEF8A000000000ULL;
MemoryLayout.PagedPoolEnd = (PVOID)(((ULONG_PTR)MemoryLayout.PagedPoolStart + PagedPoolSize) - 1);
}
else
{
MemoryLayout.PfnDatabaseAddress = (PMMPFN)0xFFFFFA8000000000ULL;
MemoryLayout.SelfMapAddress = (PVOID)0xFFFFF6FB7DBEDF68ULL;
MemoryLayout.NonPagedPoolStart = (PVOID)((ULONG_PTR)MemoryLayout.PfnDatabaseAddress + PfnDatabaseSize * MM_PAGE_SIZE);
MemoryLayout.NonPagedPoolEnd = (PVOID)0xFFFFFFFFFFBFFFFFULL;
MemoryLayout.PagedPoolStart = (PVOID)0xFFFFF8A000000000ULL;
MemoryLayout.PagedPoolEnd = (PVOID)(((ULONG_PTR)MemoryLayout.PagedPoolStart + PagedPoolSize) - 1);
}
}
/**
* Performs an early initialization of the XTOS Memory Manager.
*
@@ -34,6 +92,9 @@ MM::Manager::InitializeMemoryManager(VOID)
/* Compute allocation size for the PFN database */
MM::Pfn::ComputePfnDatabaseSize();
/* Initialize memory layout */
InitializeMemoryLayout();
}
/**