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Kernel: Add mapping from page directory base (PDB) to PageDirectory

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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:
Andreas Kling 2019-08-06 11:19:16 +02:00
parent 8d07bce12a
commit 2ad963d261
5 changed files with 60 additions and 16 deletions
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2
Kernel/VM/MemoryManager.h
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@ -108,6 +108,8 @@ private:
static Region* user_region_from_vaddr(Process&, VirtualAddress);
static Region* kernel_region_from_vaddr(VirtualAddress);
static Region* region_from_vaddr(VirtualAddress);
bool copy_on_write(Region&, unsigned page_index_in_region);
bool page_in_from_inode(Region&, unsigned page_index_in_region);
bool zero_page(Region& region, unsigned page_index_in_region);