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Kernel: Change Region allocation helpers

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We now can create a cacheable Region, so when map() is called, if a
Region is cacheable then all the virtual memory space being allocated
to it will be marked as not cache disabled.

In addition to that, OS components can create a Region that will be
mapped to a specific physical address by using the appropriate helper
method.
This commit is contained in:
Liav A 2020-01-09 23:29:31 +02:00 • committed by Andreas Kling
parent b913e30011
commit d2b41010c5
7 changed files with 77 additions and 56 deletions
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46
Kernel/VM/MemoryManager.cpp
View file

@ -321,7 +321,7 @@ void MemoryManager::create_identity_mapping(PageDirectory& page_directory, Virtu
pte.set_user_allowed(false);
pte.set_present(true);
pte.set_writable(true);
page_directory.flush(pte_address);
flush_tlb(pte_address);
}
}
@ -394,7 +394,7 @@ PageFaultResponse MemoryManager::handle_page_fault(const PageFault& fault)
return region->handle_fault(fault);
}
OwnPtr<Region> MemoryManager::allocate_kernel_region(size_t size, const StringView& name, u8 access, bool user_accessible, bool should_commit)
OwnPtr<Region> MemoryManager::allocate_kernel_region(size_t size, const StringView& name, u8 access, bool user_accessible, bool should_commit, bool cacheable)
{
InterruptDisabler disabler;
ASSERT(!(size % PAGE_SIZE));
@ -402,28 +402,47 @@ OwnPtr<Region> MemoryManager::allocate_kernel_region(size_t size, const StringVi
ASSERT(range.is_valid());
OwnPtr<Region> region;
if (user_accessible)
region = Region::create_user_accessible(range, name, access);
region = Region::create_user_accessible(range, name, access, cacheable);
else
region = Region::create_kernel_only(range, name, access);
region->map(kernel_page_directory());
region = Region::create_kernel_only(range, name, access, cacheable);
region->set_page_directory(kernel_page_directory());
// FIXME: It would be cool if these could zero-fill on demand instead.
if (should_commit)
region->commit();
return region;
}
OwnPtr<Region> MemoryManager::allocate_user_accessible_kernel_region(size_t size, const StringView& name, u8 access)
{
return allocate_kernel_region(size, name, access, true);
}
OwnPtr<Region> MemoryManager::allocate_kernel_region_with_vmobject(VMObject& vmobject, size_t size, const StringView& name, u8 access)
OwnPtr<Region> MemoryManager::allocate_kernel_region(PhysicalAddress paddr, size_t size, const StringView& name, u8 access, bool user_accessible, bool cacheable)
{
InterruptDisabler disabler;
ASSERT(!(size % PAGE_SIZE));
auto range = kernel_page_directory().range_allocator().allocate_anywhere(size);
ASSERT(range.is_valid());
auto region = make<Region>(range, vmobject, 0, name, access);
OwnPtr<Region> region;
if (user_accessible)
region = Region::create_user_accessible(range, AnonymousVMObject::create_for_physical_range(paddr, size), 0, name, access, cacheable);
else
region = Region::create_kernel_only(range, AnonymousVMObject::create_for_physical_range(paddr, size), 0, name, access, cacheable);
region->map(kernel_page_directory());
return region;
}
OwnPtr<Region> MemoryManager::allocate_user_accessible_kernel_region(size_t size, const StringView& name, u8 access, bool cacheable)
{
return allocate_kernel_region(size, name, access, true, true, cacheable);
}
OwnPtr<Region> MemoryManager::allocate_kernel_region_with_vmobject(VMObject& vmobject, size_t size, const StringView& name, u8 access, bool user_accessible, bool cacheable)
{
InterruptDisabler disabler;
ASSERT(!(size % PAGE_SIZE));
auto range = kernel_page_directory().range_allocator().allocate_anywhere(size);
ASSERT(range.is_valid());
OwnPtr<Region> region;
if (user_accessible)
region = Region::create_user_accessible(range, vmobject, 0, name, access, cacheable);
else
region = Region::create_kernel_only(range, vmobject, 0, name, access, cacheable);
region->map(kernel_page_directory());
return region;
}
@ -573,6 +592,9 @@ void MemoryManager::flush_entire_tlb()
void MemoryManager::flush_tlb(VirtualAddress vaddr)
{
#ifdef MM_DEBUG
dbgprintf("MM: Flush page V%p\n", vaddr.get());
#endif
asm volatile("invlpg %0"
:
: "m"(*(char*)vaddr.get())