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https://github.com/RGBCube/serenity
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d550b09871
All code that is related to PC BIOS should not be in the Kernel/Firmware directory as this directory is for abstracted and platform-agnostic code like ACPI (and device tree parsing in the future). This fixes a problem with the aarch64 architecure, as these machines don't have any PC-BIOS in them so actually trying to access these memory locations (EBDA, BIOS ROM) does not make any sense, as they're specific to x86 machines only.
61 lines
1.9 KiB
C++
61 lines
1.9 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/Arch/x86_64/Firmware/PCBIOS/Mapper.h>
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#include <Kernel/Arch/x86_64/Firmware/PCBIOS/SysFSComponent.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Library/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<SysFSPCBIOSComponent> SysFSPCBIOSComponent::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) SysFSPCBIOSComponent(type, blob_paddr, blob_size)).release_nonnull();
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}
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UNMAP_AFTER_INIT SysFSPCBIOSComponent::SysFSPCBIOSComponent(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> SysFSPCBIOSComponent::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 SysFSPCBIOSComponent::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>> SysFSPCBIOSComponent::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("SysFSPCBIOSComponent: Blob"sv, Span<u8> { blob.ptr(), m_blob_length });
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}
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}
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