1 files changed, 25 insertions, 0 deletions
diff --git a/Kernel/Memory/ScatterGatherList.cpp b/Kernel/Memory/ScatterGatherList.cpp
new file mode 100644
index 0000000000..c3b65f31df
--- /dev/null
+++ b/Kernel/Memory/ScatterGatherList.cpp
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/Memory/ScatterGatherList.h>
+
+namespace Kernel {
+
+RefPtr<ScatterGatherList> ScatterGatherList::try_create(AsyncBlockDeviceRequest& request, Span<NonnullRefPtr<PhysicalPage>> allocated_pages, size_t device_block_size)
+{
+    auto vm_object = AnonymousVMObject::try_create_with_physical_pages(allocated_pages);
+    if (!vm_object)
+        return {};
+    return adopt_ref_if_nonnull(new (nothrow) ScatterGatherList(vm_object.release_nonnull(), request, device_block_size));
+}
+
+ScatterGatherList::ScatterGatherList(NonnullRefPtr<AnonymousVMObject> vm_object, AsyncBlockDeviceRequest& request, size_t device_block_size)
+    : m_vm_object(move(vm_object))
+{
+    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);
+}
+
+}