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3aa1bd520b
This is required for example when write combine is enabled on a region after the initial mapping.
33 lines
1.1 KiB
C++
33 lines
1.1 KiB
C++
/*
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* Copyright (c) 2024, Idan Horowitz <idan.horowitz@serenityos.org>
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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/MMIOVMObject.h>
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namespace Kernel::Memory {
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ErrorOr<NonnullLockRefPtr<MMIOVMObject>> MMIOVMObject::try_create_for_physical_range(PhysicalAddress paddr, size_t size)
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{
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if (paddr.offset(size) < paddr) {
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dbgln("Shenanigans! MMIOVMObject::try_create_for_physical_range({}, {}) would wrap around", paddr, size);
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// Since we can't wrap around yet, let's pretend to OOM.
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return ENOMEM;
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}
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// FIXME: We have to make this allocation because VMObject determines the size of the VMObject based on the physical pages array
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auto new_physical_pages = TRY(VMObject::try_create_physical_pages(size));
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return adopt_nonnull_lock_ref_or_enomem(new (nothrow) MMIOVMObject(paddr, move(new_physical_pages)));
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}
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MMIOVMObject::MMIOVMObject(PhysicalAddress paddr, FixedArray<RefPtr<PhysicalRAMPage>>&& new_physical_pages)
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: VMObject(move(new_physical_pages))
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, m_base_address(paddr)
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{
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VERIFY(paddr.page_base() == paddr);
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}
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}
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