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https://github.com/RGBCube/serenity
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Kernel/USB: Tidy up UHCIDescriptorPool construction
- Use KResultOr<NonnullRefPtr<UHCIDescriptorPool<T>> - Make the constructor private - Use TRY() at call sites
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commit
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2 changed files with 20 additions and 28 deletions
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@ -20,36 +20,23 @@ namespace Kernel::USB {
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// that can fit in a single page.
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template<typename T>
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class UHCIDescriptorPool {
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AK_MAKE_NONCOPYABLE(UHCIDescriptorPool);
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AK_MAKE_NONMOVABLE(UHCIDescriptorPool);
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// Ensure that we can't get into a situation where we'll write past the page
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// and blow up
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static_assert(sizeof(T) <= PAGE_SIZE);
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public:
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static OwnPtr<UHCIDescriptorPool<T>> try_create(const StringView name)
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static KResultOr<NonnullOwnPtr<UHCIDescriptorPool<T>>> try_create(StringView name)
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{
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auto pool_memory_block = MM.allocate_kernel_region(PAGE_SIZE, "UHCI Descriptor Pool", Memory::Region::Access::ReadWrite);
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if (!pool_memory_block)
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return {};
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return ENOMEM;
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return adopt_own_if_nonnull(new (nothrow) UHCIDescriptorPool(pool_memory_block.release_nonnull(), name));
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return adopt_nonnull_own_or_enomem(new (nothrow) UHCIDescriptorPool(pool_memory_block.release_nonnull(), name));
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}
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UHCIDescriptorPool(NonnullOwnPtr<Memory::Region> pool_memory_block, const StringView& name)
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: m_pool_name(name)
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, m_pool_region(move(pool_memory_block))
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{
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// Go through the number of descriptors to create in the pool, and create a virtual/physical address mapping
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for (size_t i = 0; i < PAGE_SIZE / sizeof(T); i++) {
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auto placement_address = reinterpret_cast<void*>(m_pool_region->vaddr().get() + (i * sizeof(T)));
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auto physical_address = static_cast<u32>(m_pool_region->physical_page(0)->paddr().get() + (i * sizeof(T)));
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auto* object = new (placement_address) T(physical_address);
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m_free_descriptor_stack.push(object); // Push the descriptor's pointer onto the free list
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}
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}
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public:
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UHCIDescriptorPool() = delete;
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~UHCIDescriptorPool() = default;
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[[nodiscard]] T* try_take_free_descriptor()
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@ -78,6 +65,19 @@ public:
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}
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private:
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UHCIDescriptorPool(NonnullOwnPtr<Memory::Region> pool_memory_block, StringView name)
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: m_pool_name(name)
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, m_pool_region(move(pool_memory_block))
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{
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// Go through the number of descriptors to create in the pool, and create a virtual/physical address mapping
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for (size_t i = 0; i < PAGE_SIZE / sizeof(T); i++) {
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auto placement_address = reinterpret_cast<void*>(m_pool_region->vaddr().get() + (i * sizeof(T)));
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auto physical_address = static_cast<u32>(m_pool_region->physical_page(0)->paddr().get() + (i * sizeof(T)));
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auto* object = new (placement_address) T(physical_address);
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m_free_descriptor_stack.push(object); // Push the descriptor's pointer onto the free list
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}
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}
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StringView m_pool_name; // Name of this pool
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NonnullOwnPtr<Memory::Region> m_pool_region; // Memory region where descriptors actually reside
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Stack<T*, PAGE_SIZE / sizeof(T)> m_free_descriptor_stack; // Stack of currently free descriptor pointers
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