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b02ee664e7
To do this we also need to get rid of LockRefPtrs in the USB code as well. Most of the SysFS nodes are statically generated during boot and are not mutated afterwards. The same goes for general device code - once we generate the appropriate SysFS nodes, we almost never mutate the node pointers afterwards, making locking unnecessary.
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringView.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Firmware/BIOS/Component.h>
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#include <Kernel/Firmware/BIOS.h>
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#include <Kernel/KBufferBuilder.h>
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/Memory/TypedMapping.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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NonnullRefPtr<BIOSSysFSComponent> BIOSSysFSComponent::must_create(Type type, PhysicalAddress blob_paddr, size_t blob_size)
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{
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return adopt_ref_if_nonnull(new (nothrow) BIOSSysFSComponent(type, blob_paddr, blob_size)).release_nonnull();
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}
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UNMAP_AFTER_INIT BIOSSysFSComponent::BIOSSysFSComponent(Type type, PhysicalAddress blob_paddr, size_t blob_size)
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: SysFSComponent()
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, m_blob_paddr(blob_paddr)
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, m_blob_length(blob_size)
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, m_type(type)
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{
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}
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ErrorOr<size_t> BIOSSysFSComponent::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const
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{
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auto blob = TRY(try_to_generate_buffer());
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if ((size_t)offset >= blob->size())
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return 0;
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ssize_t nread = min(static_cast<off_t>(blob->size() - offset), static_cast<off_t>(count));
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TRY(buffer.write(blob->data() + offset, nread));
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return nread;
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}
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StringView BIOSSysFSComponent::name() const
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{
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switch (m_type) {
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case Type::DMIEntryPoint:
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return "smbios_entry_point"sv;
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case Type::SMBIOSTable:
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return "DMI"sv;
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default:
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break;
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}
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VERIFY_NOT_REACHED();
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}
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ErrorOr<NonnullOwnPtr<KBuffer>> BIOSSysFSComponent::try_to_generate_buffer() const
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{
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auto blob = TRY(Memory::map_typed<u8>((m_blob_paddr), m_blob_length));
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return KBuffer::try_create_with_bytes("BIOSSysFSComponent: Blob"sv, Span<u8> { blob.ptr(), m_blob_length });
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}
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}
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