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Serenity Operating System
1/*
2 * Copyright (c) 2021, the SerenityOS developers.
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <Kernel/Memory/ScatterGatherList.h>
8
9namespace Kernel::Memory {
10
11LockRefPtr<ScatterGatherList> ScatterGatherList::try_create(AsyncBlockDeviceRequest& request, Span<NonnullRefPtr<PhysicalPage>> allocated_pages, size_t device_block_size)
12{
13 auto maybe_vm_object = AnonymousVMObject::try_create_with_physical_pages(allocated_pages);
14 if (maybe_vm_object.is_error()) {
15 // FIXME: Would be nice to be able to return a ErrorOr here.
16 return {};
17 }
18 return adopt_lock_ref_if_nonnull(new (nothrow) ScatterGatherList(maybe_vm_object.release_value(), request, device_block_size));
19}
20
21ScatterGatherList::ScatterGatherList(NonnullLockRefPtr<AnonymousVMObject> vm_object, AsyncBlockDeviceRequest& request, size_t device_block_size)
22 : m_vm_object(move(vm_object))
23{
24 auto region_or_error = MM.allocate_kernel_region_with_vmobject(m_vm_object, page_round_up((request.block_count() * device_block_size)).release_value_but_fixme_should_propagate_errors(), "AHCI Scattered DMA"sv, Region::Access::Read | Region::Access::Write, Region::Cacheable::Yes);
25 if (region_or_error.is_error())
26 TODO();
27 m_dma_region = region_or_error.release_value();
28}
29
30}