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https://github.com/SerenityOS/serenity
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4bfd6e41b9
This makes for nicer handling of errors compared to checking whether a RefPtr is null. Additionally, this will give way to return different types of errors in the future.
28 lines
1.1 KiB
C++
28 lines
1.1 KiB
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/Memory/ScatterGatherList.h>
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namespace Kernel::Memory {
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RefPtr<ScatterGatherList> ScatterGatherList::try_create(AsyncBlockDeviceRequest& request, Span<NonnullRefPtr<PhysicalPage>> allocated_pages, size_t device_block_size)
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{
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auto maybe_vm_object = AnonymousVMObject::try_create_with_physical_pages(allocated_pages);
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if (maybe_vm_object.is_error()) {
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// FIXME: Would be nice to be able to return a KResultOr here.
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return {};
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}
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return adopt_ref_if_nonnull(new (nothrow) ScatterGatherList(maybe_vm_object.release_value(), 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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