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https://github.com/RGBCube/serenity
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88d490566f
try_*() implies that it can fail (and they all return RefPtr with nullptr signalling failure.)
25 lines
991 B
C++
25 lines
991 B
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/VM/ScatterGatherList.h>
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namespace Kernel {
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RefPtr<ScatterGatherList> ScatterGatherList::create(AsyncBlockDeviceRequest& request, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size)
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{
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auto vm_object = AnonymousVMObject::try_create_with_physical_pages(allocated_pages);
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if (!vm_object)
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return {};
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return adopt_ref_if_nonnull(new (nothrow) ScatterGatherList(vm_object.release_nonnull(), request, device_block_size));
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}
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ScatterGatherList::ScatterGatherList(NonnullRefPtr<AnonymousVMObject> vm_object, AsyncBlockDeviceRequest& request, size_t device_block_size)
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: m_vm_object(move(vm_object))
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{
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m_dma_region = MM.allocate_kernel_region_with_vmobject(m_vm_object, page_round_up((request.block_count() * device_block_size)), "AHCI Scattered DMA", Region::Access::Read | Region::Access::Write, Region::Cacheable::Yes);
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}
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}
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