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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
31 lines
1.2 KiB
C++
31 lines
1.2 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 ErrorOr 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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auto region_or_error = 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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if (region_or_error.is_error())
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TODO();
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m_dma_region = region_or_error.release_value();
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}
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}
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