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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Bus/PCI/API.h>
#include <Kernel/Bus/PCI/Access.h>
#include <Kernel/Debug.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Bus/PCI/DeviceAttribute.h>
#include <Kernel/Sections.h>
namespace Kernel {
StringView PCIDeviceAttributeSysFSComponent::name() const
{
switch (m_offset) {
case PCI::RegisterOffset::VENDOR_ID:
return "vendor"sv;
case PCI::RegisterOffset::DEVICE_ID:
return "device_id"sv;
case PCI::RegisterOffset::CLASS:
return "class"sv;
case PCI::RegisterOffset::SUBCLASS:
return "subclass"sv;
case PCI::RegisterOffset::REVISION_ID:
return "revision"sv;
case PCI::RegisterOffset::PROG_IF:
return "progif"sv;
case PCI::RegisterOffset::SUBSYSTEM_VENDOR_ID:
return "subsystem_vendor"sv;
case PCI::RegisterOffset::SUBSYSTEM_ID:
return "subsystem_id"sv;
case PCI::RegisterOffset::BAR0:
return "bar0"sv;
case PCI::RegisterOffset::BAR1:
return "bar1"sv;
case PCI::RegisterOffset::BAR2:
return "bar2"sv;
case PCI::RegisterOffset::BAR3:
return "bar3"sv;
case PCI::RegisterOffset::BAR4:
return "bar4"sv;
case PCI::RegisterOffset::BAR5:
return "bar5"sv;
default:
VERIFY_NOT_REACHED();
}
}
NonnullRefPtr<PCIDeviceAttributeSysFSComponent> PCIDeviceAttributeSysFSComponent::create(PCIDeviceSysFSDirectory const& device, PCI::RegisterOffset offset, size_t field_bytes_width)
{
return adopt_ref(*new (nothrow) PCIDeviceAttributeSysFSComponent(device, offset, field_bytes_width));
}
PCIDeviceAttributeSysFSComponent::PCIDeviceAttributeSysFSComponent(PCIDeviceSysFSDirectory const& device, PCI::RegisterOffset offset, size_t field_bytes_width)
: SysFSComponent()
, m_device(device)
, m_offset(offset)
, m_field_bytes_width(field_bytes_width)
{
}
ErrorOr<size_t> PCIDeviceAttributeSysFSComponent::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;
}
ErrorOr<NonnullOwnPtr<KBuffer>> PCIDeviceAttributeSysFSComponent::try_to_generate_buffer() const
{
OwnPtr<KString> value;
switch (m_field_bytes_width) {
case 1:
value = TRY(KString::formatted("{:#x}", PCI::read8(m_device->address(), m_offset)));
break;
case 2:
value = TRY(KString::formatted("{:#x}", PCI::read16(m_device->address(), m_offset)));
break;
case 4:
value = TRY(KString::formatted("{:#x}", PCI::read32(m_device->address(), m_offset)));
break;
default:
VERIFY_NOT_REACHED();
}
return KBuffer::try_create_with_bytes(value->view().bytes());
}
}
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