mirror of
https://github.com/RGBCube/serenity
synced 2025-07-25 16:57:35 +00:00
Kernel: Add mapping from page directory base (PDB) to PageDirectory
This allows the page fault code to find the owning PageDirectory and corresponding process for faulting regions. The mapping is implemented as a global hash map right now, which is definitely not optimal. We can come up with something better when it becomes necessary.
This commit is contained in:
parent
8d07bce12a
commit
2ad963d261
5 changed files with 60 additions and 16 deletions
|
@ -1,17 +1,24 @@
|
|||
#pragma once
|
||||
|
||||
#include <AK/HashMap.h>
|
||||
#include <AK/RefPtr.h>
|
||||
#include <AK/RefCounted.h>
|
||||
#include <AK/RefPtr.h>
|
||||
#include <Kernel/VM/PhysicalPage.h>
|
||||
#include <Kernel/VM/RangeAllocator.h>
|
||||
|
||||
class Process;
|
||||
|
||||
class PageDirectory : public RefCounted<PageDirectory> {
|
||||
friend class MemoryManager;
|
||||
|
||||
public:
|
||||
static NonnullRefPtr<PageDirectory> create_for_userspace(const RangeAllocator* parent_range_allocator = nullptr) { return adopt(*new PageDirectory(parent_range_allocator)); }
|
||||
static NonnullRefPtr<PageDirectory> create_for_userspace(Process& process, const RangeAllocator* parent_range_allocator = nullptr)
|
||||
{
|
||||
return adopt(*new PageDirectory(process, parent_range_allocator));
|
||||
}
|
||||
static NonnullRefPtr<PageDirectory> create_at_fixed_address(PhysicalAddress paddr) { return adopt(*new PageDirectory(paddr)); }
|
||||
static RefPtr<PageDirectory> find_by_pdb(u32);
|
||||
|
||||
~PageDirectory();
|
||||
|
||||
u32 cr3() const { return m_directory_page->paddr().get(); }
|
||||
|
@ -21,10 +28,14 @@ public:
|
|||
|
||||
RangeAllocator& range_allocator() { return m_range_allocator; }
|
||||
|
||||
Process* process() { return m_process; }
|
||||
const Process* process() const { return m_process; }
|
||||
|
||||
private:
|
||||
explicit PageDirectory(const RangeAllocator* parent_range_allocator);
|
||||
PageDirectory(Process&, const RangeAllocator* parent_range_allocator);
|
||||
explicit PageDirectory(PhysicalAddress);
|
||||
|
||||
Process* m_process { nullptr };
|
||||
RangeAllocator m_range_allocator;
|
||||
RefPtr<PhysicalPage> m_directory_page;
|
||||
HashMap<unsigned, RefPtr<PhysicalPage>> m_physical_pages;
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue