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/*
* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringView.h>
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Firmware/BIOS/Component.h>
#include <Kernel/Firmware/BIOS.h>
#include <Kernel/KBufferBuilder.h>
#include <Kernel/Memory/MemoryManager.h>
#include <Kernel/Memory/TypedMapping.h>
#include <Kernel/Sections.h>
namespace Kernel {
NonnullRefPtr<BIOSSysFSComponent> BIOSSysFSComponent::must_create(Type type, PhysicalAddress blob_paddr, size_t blob_size)
{
return adopt_ref_if_nonnull(new (nothrow) BIOSSysFSComponent(type, blob_paddr, blob_size)).release_nonnull();
}
UNMAP_AFTER_INIT BIOSSysFSComponent::BIOSSysFSComponent(Type type, PhysicalAddress blob_paddr, size_t blob_size)
: SysFSComponent()
, m_blob_paddr(blob_paddr)
, m_blob_length(blob_size)
, m_type(type)
{
}
ErrorOr<size_t> BIOSSysFSComponent::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const
{
auto blob = TRY(try_to_generate_buffer());
if ((size_t)offset >= blob->size())
return 0;
ssize_t nread = min(static_cast<off_t>(blob->size() - offset), static_cast<off_t>(count));
TRY(buffer.write(blob->data() + offset, nread));
return nread;
}
StringView BIOSSysFSComponent::name() const
{
switch (m_type) {
case Type::DMIEntryPoint:
return "smbios_entry_point"sv;
case Type::SMBIOSTable:
return "DMI"sv;
default:
break;
}
VERIFY_NOT_REACHED();
}
ErrorOr<NonnullOwnPtr<KBuffer>> BIOSSysFSComponent::try_to_generate_buffer() const
{
auto blob = TRY(Memory::map_typed<u8>((m_blob_paddr), m_blob_length));
return KBuffer::try_create_with_bytes("BIOSSysFSComponent: Blob"sv, Span<u8> { blob.ptr(), m_blob_length });
}
}
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