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Architecture-specific system PTE limits
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This commit is contained in:
Aiken Harris
2025-12-16 20:05:51 +01:00
parent 020b7c7676
commit 00d428d8de
5 changed files with 40 additions and 2 deletions
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6
xtoskrnl/mm/data.cc
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@@ -30,9 +30,15 @@ ULONG_PTR MM::Pfn::HighestPhysicalPage;
/* Lowest physical page number */
ULONG_PTR MM::Pfn::LowestPhysicalPage = -1;
/* Memory layout */
MMMEMORY_LAYOUT MM::Manager::MemoryLayout;
/* Number of physical pages */
ULONG MM::Pfn::NumberOfPhysicalPages;
/* Number of system PTEs */
PFN_NUMBER MM::Manager::NumberOfSystemPtes;
/* Old biggest free memory descriptor */
LOADER_MEMORY_DESCRIPTOR MM::Pfn::OriginalFreeDescriptor;

20
xtoskrnl/mm/mmgr.cc
View File

@@ -25,6 +25,13 @@ MM::Manager::GetMemoryLayout(VOID)
return &MemoryLayout;
}
XTAPI
PFN_NUMBER
MM::Manager::GetNumberOfSystemPtes()
{
return NumberOfSystemPtes;
}
/**
* Initializes the kernel's virtual memory layout.
*
@@ -48,36 +55,45 @@ MM::Manager::InitializeMemoryLayout(VOID)
/* Retrieve the PFN database size */
PfnDatabaseSize = MM::Pfn::GetPfnDatabaseSize();
/* Define the number of system PTEs */
NumberOfSystemPtes = MM_DEFAULT_NUMBER_SYSTEM_PTES;
if(MM::Paging::GetXpaStatus())
{
/* Configure memory layout for 5-level paging, using 57bit address space and providing a 128 PB address space */
MemoryLayout.PfnDatabaseAddress = (PMMPFN)0xFFFEFA8000000000ULL;
MemoryLayout.SelfMapAddress = (PVOID)0xFFEDF6FB7DBEDF68ULL;
/* Define the non-paged and paged pool regions */
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);
/* Define hyperspace, system PTE space, and the user space limit */
MemoryLayout.HyperSpaceStart = (PVOID)0xFFFEF70000000000ULL;
MemoryLayout.HyperSpaceEnd = (PVOID)0xFFFEF77FFFFFFFFFULL;
MemoryLayout.SystemSpaceStart = (PVOID)0xFFFEF88000000000ULL;
MemoryLayout.SystemSpaceEnd = (PVOID)((ULONG_PTR)MemoryLayout.SystemSpaceStart + (MM_NUMBER_SYSTEM_PTES + 1) * MM_PAGE_SIZE);
MemoryLayout.SystemSpaceEnd = (PVOID)((ULONG_PTR)MemoryLayout.SystemSpaceStart + (NumberOfSystemPtes + 1) * MM_PAGE_SIZE);
MemoryLayout.UserSpaceEnd = (PVOID)0x07FFFFFFFFFFFFFULL;
}
else
{
/* Configure memory layout for 4-level paging, using 48bit address space and providing a 128 TB address space */
MemoryLayout.PfnDatabaseAddress = (PMMPFN)0xFFFFFA8000000000ULL;
MemoryLayout.SelfMapAddress = (PVOID)0xFFFFF6FB7DBEDF68ULL;
/* Define the non-paged and paged pool regions */
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);
/* Define hyperspace, system PTE space, and the user space limit */
MemoryLayout.HyperSpaceStart = (PVOID)0xFFFFF70000000000ULL;
MemoryLayout.HyperSpaceEnd = (PVOID)0xFFFFF77FFFFFFFFFULL;
MemoryLayout.SystemSpaceStart = (PVOID)0xFFFFF88000000000ULL;
MemoryLayout.SystemSpaceEnd = (PVOID)((ULONG_PTR)MemoryLayout.SystemSpaceStart + (MM_NUMBER_SYSTEM_PTES + 1) * MM_PAGE_SIZE);
MemoryLayout.SystemSpaceEnd = (PVOID)((ULONG_PTR)MemoryLayout.SystemSpaceStart + (NumberOfSystemPtes + 1) * MM_PAGE_SIZE);
MemoryLayout.UserSpaceEnd = (PVOID)0x000007FFFFFEFFFFULL;
}
}