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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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6
Kernel/VM/PhysicalRegion.h
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@ -52,12 +52,12 @@ public:
bool contains(const PhysicalPage& page) const { return page.paddr() >= m_lower && page.paddr() <= m_upper; }
RefPtr<PhysicalPage> take_free_page(bool supervisor);
NonnullRefPtrVector<PhysicalPage> take_contiguous_free_pages(size_t count, bool supervisor);
NonnullRefPtrVector<PhysicalPage> take_contiguous_free_pages(size_t count, bool supervisor, size_t physical_alignment = PAGE_SIZE);
void return_page(const PhysicalPage& page);
private:
unsigned find_contiguous_free_pages(size_t count);
Optional<unsigned> find_and_allocate_contiguous_range(size_t count);
unsigned find_contiguous_free_pages(size_t count, size_t physical_alignment = PAGE_SIZE);
Optional<unsigned> find_and_allocate_contiguous_range(size_t count, unsigned alignment = 1);
Optional<unsigned> find_one_free_page();
void free_page_at(PhysicalAddress addr);