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Move memory layout initialization to architecture-specific code
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This commit is contained in:
Aiken Harris
2025-12-16 20:36:16 +01:00
parent 00d428d8de
commit 728241f998
4 changed files with 133 additions and 66 deletions
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77
xtoskrnl/mm/amd64/mmgr.cc Normal file
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/**
* PROJECT: ExectOS
* COPYRIGHT: See COPYING.md in the top level directory
* FILE: xtoskrnl/mm/amd64/mmgr.cc
* DESCRIPTION: Memory Manager
* DEVELOPERS: Aiken Harris <harraiken91@gmail.com>
*/
#include <xtos.hh>
/**
* 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;
ULONG PtesPerPage;
/* Get the number of PTEs per page and calculate size of paged pool (at least 32MiB) */
PtesPerPage = MM::Pte::GetPtesPerPage();
PteCount = ((SIZE_TO_PAGES(33554432) + (PtesPerPage - 1)) / PtesPerPage);
PagedPoolSize = PteCount * PtesPerPage * MM_PAGE_SIZE;
/* Retrieve the PFN database size */
PfnDatabaseSize = MM::Pfn::GetPfnDatabaseSize();
/* Define the number of system PTEs */
NumberOfSystemPtes = MM_DEFAULT_NUMBER_SYSTEM_PTES;
/* Check if 5-level paging (LA57) is enabled */
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)MM_PML5_SELF_MAP_ADDRESS;
/* 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 + (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)MM_PML4_SELF_MAP_ADDRESS;
/* 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 + (NumberOfSystemPtes + 1) * MM_PAGE_SIZE);
MemoryLayout.UserSpaceEnd = (PVOID)0x000007FFFFFEFFFFULL;
}
}