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609495882f
This memory is not accessible to userspace and comes from the kernel page allocator, not from the kmalloc heap. This makes it ideal for larger allocations.
38 lines
1020 B
C++
38 lines
1020 B
C++
#pragma once
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#include <AK/Assertions.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/Region.h>
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class KBuffer : public RefCounted<KBuffer> {
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public:
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static NonnullRefPtr<KBuffer> create_with_size(size_t size)
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{
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auto region = MM.allocate_kernel_region(PAGE_ROUND_UP(size), "KBuffer");
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ASSERT(region);
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return adopt(*new KBuffer(*region, size));
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}
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static NonnullRefPtr<KBuffer> copy(const void* data, size_t size)
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{
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auto buffer = create_with_size(size);
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memcpy(buffer->data(), data, size);
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return buffer;
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}
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u8* data() { return m_region->vaddr().as_ptr(); }
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const u8* data() const { return m_region->vaddr().as_ptr(); }
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size_t size() const { return m_size; }
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size_t capacity() const { return m_region->size(); }
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private:
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explicit KBuffer(NonnullRefPtr<Region>&& region, size_t size)
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: m_size(size)
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, m_region(move(region))
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{
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}
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size_t m_size { 0 };
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NonnullRefPtr<Region> m_region;
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};
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