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Kernel: Move PC BIOS-related code to the x86_64 architecture directory

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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.
This commit is contained in:
Liav A 2023-06-09 21:22:30 +03:00 • committed by Jelle Raaijmakers
parent 5fd975da8f
commit d550b09871
12 changed files with 49 additions and 44 deletions
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61
Kernel/FileSystem/SysFS/Subsystems/Firmware/BIOS/Component.cpp
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@ -1,61 +0,0 @@
/*
* 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/Library/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 });
}
}