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Add a PageDirectory::flush() that does nothing if another PD is active.

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This way callers can just flush() every time after making any modification
and the PageDirectory itself will decide if TLB invalidation is necessary.
This commit is contained in:
Andreas Kling
2018-12-31 20:52:59 +01:00
parent cc30407b8c
commit a5ffa2eec7
2 changed files with 11 additions and 14 deletions
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23
Kernel/MemoryManager.cpp
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@@ -439,8 +439,7 @@ void MemoryManager::remap_region_page(PageDirectory& page_directory, Region& reg
else
pte.set_writable(region.is_writable);
pte.set_user_allowed(user_allowed);
if (page_directory.is_active())
flush_tlb(page_laddr);
page_directory.flush(page_laddr);
#ifdef MM_DEBUG
dbgprintf("MM: >> remap_region_page (PD=%x) '%s' L%x => P%x (@%p)\n", &page_directory, region.name.characters(), page_laddr.get(), physical_page->paddr().get(), physical_page.ptr());
#endif
@@ -477,8 +476,7 @@ void MemoryManager::map_region_at_address(PageDirectory& page_directory, Region&
pte.set_writable(region.is_writable);
}
pte.set_user_allowed(user_allowed);
if (page_directory.is_active())
flush_tlb(page_laddr);
page_directory.flush(page_laddr);
#ifdef MM_DEBUG
dbgprintf("MM: >> map_region_at_address (PD=%x) '%s' L%x => P%x (@%p)\n", &page_directory, region.name.characters(), page_laddr, physical_page ? physical_page->paddr().get() : 0, physical_page.ptr());
#endif
@@ -498,8 +496,7 @@ void MemoryManager::unmap_range(PageDirectory& page_directory, LinearAddress lad
pte.set_present(false);
pte.set_writable(false);
pte.set_user_allowed(false);
if (page_directory.is_active())
flush_tlb(page_laddr);
page_directory.flush(page_laddr);
#ifdef MM_DEBUG
dbgprintf("MM: << unmap_range L%x =/> 0\n", page_laddr);
#endif
@@ -548,8 +545,7 @@ bool MemoryManager::unmap_region(Process& process, Region& region)
pte.set_present(false);
pte.set_writable(false);
pte.set_user_allowed(false);
if (process.page_directory().is_active())
flush_tlb(laddr);
process.page_directory().flush(laddr);
#ifdef MM_DEBUG
auto& physical_page = region.vmo().physical_pages()[region.first_page_index() + i];
dbgprintf("MM: >> Unmapped L%x => P%x <<\n", laddr, physical_page ? physical_page->paddr().get() : 0);
@@ -772,11 +768,6 @@ void MemoryManager::unregister_region(Region& region)
m_regions.remove(&region);
}
inline bool PageDirectory::is_active() const
{
return &current->page_directory() == this;
}
size_t Region::committed() const
{
size_t bytes = 0;
@@ -801,3 +792,9 @@ PageDirectory::~PageDirectory()
MM.remove_identity_mapping(LinearAddress(page_table.paddr().get()), PAGE_SIZE);
}
}
void PageDirectory::flush(LinearAddress laddr)
{
if (&current->page_directory() == this)
MM.flush_tlb(laddr);
}