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SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
48 lines
1.5 KiB
C++
48 lines
1.5 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/VM/ScatterGatherList.h>
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namespace Kernel {
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ScatterGatherList ScatterGatherList::create_from_buffer(const u8* buffer, size_t size)
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{
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VERIFY(buffer && size);
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ScatterGatherList new_list;
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auto* region = MM.find_region_from_vaddr(VirtualAddress(buffer));
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VERIFY(region);
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while (size > 0) {
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size_t offset_in_page = (VirtualAddress(buffer) - region->vaddr()).get() % PAGE_SIZE;
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size_t size_in_page = min(PAGE_SIZE - offset_in_page, size);
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VERIFY(offset_in_page + size_in_page - 1 <= PAGE_SIZE);
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new_list.add_entry(region->physical_page(region->page_index_from_address(VirtualAddress(buffer)))->paddr().get(), offset_in_page, size_in_page);
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size -= size_in_page;
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buffer += size_in_page;
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}
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return new_list;
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}
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ScatterGatherList ScatterGatherList::create_from_physical(PhysicalAddress paddr, size_t size)
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{
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VERIFY(!paddr.is_null() && size);
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ScatterGatherList new_list;
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new_list.add_entry(paddr.page_base().get(), paddr.offset_in_page(), size);
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return new_list;
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}
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void ScatterGatherList::add_entry(FlatPtr addr, size_t offset, size_t size)
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{
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m_entries.append({ addr, offset, size });
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}
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void ScatterGatherList::for_each_entry(Function<void(const FlatPtr, const size_t)> callback) const
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{
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for (auto& entry : m_entries)
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callback(entry.page_base + entry.offset, entry.length);
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}
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}
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