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Kernel: Allow specifying a physical alignment when allocating

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Some drivers may require allocating contiguous physical pages with
a specific alignment for the physical address.
This commit is contained in:
Tom 2020-12-05 22:49:24 -07:00 • committed by Andreas Kling
parent d5472426ec
commit affb4ef01b
6 changed files with 29 additions and 23 deletions
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10
Kernel/VM/MemoryManager.cpp
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@ -394,14 +394,14 @@ PageFaultResponse MemoryManager::handle_page_fault(const PageFault& fault)
return region->handle_fault(fault, lock);
}
OwnPtr<Region> MemoryManager::allocate_contiguous_kernel_region(size_t size, const StringView& name, u8 access, bool user_accessible, bool cacheable)
OwnPtr<Region> MemoryManager::allocate_contiguous_kernel_region(size_t size, const StringView& name, u8 access, size_t physical_alignment, bool user_accessible, bool cacheable)
{
ASSERT(!(size % PAGE_SIZE));
ScopedSpinLock lock(s_mm_lock);
auto range = kernel_page_directory().range_allocator().allocate_anywhere(size);
if (!range.has_value())
return {};
auto vmobject = ContiguousVMObject::create_with_size(size);
auto vmobject = ContiguousVMObject::create_with_size(size, physical_alignment);
return allocate_kernel_region_with_vmobject(range.value(), vmobject, name, access, user_accessible, cacheable);
}
@ -610,7 +610,7 @@ void MemoryManager::deallocate_supervisor_physical_page(const PhysicalPage& page
ASSERT_NOT_REACHED();
}
NonnullRefPtrVector<PhysicalPage> MemoryManager::allocate_contiguous_supervisor_physical_pages(size_t size)
NonnullRefPtrVector<PhysicalPage> MemoryManager::allocate_contiguous_supervisor_physical_pages(size_t size, size_t physical_alignment)
{
ASSERT(!(size % PAGE_SIZE));
ScopedSpinLock lock(s_mm_lock);
@ -618,9 +618,9 @@ NonnullRefPtrVector<PhysicalPage> MemoryManager::allocate_contiguous_supervisor_
NonnullRefPtrVector<PhysicalPage> physical_pages;
for (auto& region : m_super_physical_regions) {
physical_pages = region.take_contiguous_free_pages((count), true);
physical_pages = region.take_contiguous_free_pages(count, true, physical_alignment);
if (!physical_pages.is_empty())
break;
continue;
}
if (physical_pages.is_empty()) {