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https://github.com/SerenityOS/serenity
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d3a0ae5c57
This replaces all usages of Cacheable::Yes with MemoryType::Normal and
Cacheable::No with either MemoryType::NonCacheable or MemoryType::IO,
depending on the context.
The Page{Directory,Table}::set_cache_disabled function therefore also
has been replaced with a more appropriate set_memory_type_function.
Adding a memory_type "getter" would not be as easy, as some
architectures may not support all memory types, so getting the memory
type again may be a lossy conversion. The is_cache_disabled function
was never used, so just simply remove it altogether.
There is no difference between MemoryType::NonCacheable and
MemoryType::IO on x86 for now.
Other architectures currently don't respect the MemoryType at all.
27 lines
1018 B
C++
27 lines
1018 B
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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ErrorOr<LockRefPtr<ScatterGatherList>> ScatterGatherList::try_create(AsyncBlockDeviceRequest& request, Span<NonnullRefPtr<PhysicalRAMPage>> allocated_pages, size_t device_block_size, StringView region_name)
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{
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auto vm_object = TRY(AnonymousVMObject::try_create_with_physical_pages(allocated_pages));
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auto size = TRY(page_round_up((request.block_count() * device_block_size)));
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auto region = TRY(MM.allocate_kernel_region_with_vmobject(vm_object, size, region_name, Region::Access::Read | Region::Access::Write, MemoryType::Normal));
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return adopt_lock_ref_if_nonnull(new (nothrow) ScatterGatherList(vm_object, move(region)));
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}
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ScatterGatherList::ScatterGatherList(NonnullLockRefPtr<AnonymousVMObject> vm_object, NonnullOwnPtr<Region> dma_region)
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: m_vm_object(move(vm_object))
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, m_dma_region(move(dma_region))
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{
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}
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}
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