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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Singleton.h>
#include <Kernel/Devices/Device.h>
#include <Kernel/FileSystem/InodeMetadata.h>
namespace Kernel {
static Singleton<HashMap<u32, Device*>> s_all_devices;
HashMap<u32, Device*>& Device::all_devices()
{
return *s_all_devices;
}
void Device::for_each(Function<void(Device&)> callback)
{
for (auto& entry : all_devices())
callback(*entry.value);
}
Device* Device::get_device(unsigned major, unsigned minor)
{
auto it = all_devices().find(encoded_device(major, minor));
if (it == all_devices().end())
return nullptr;
return it->value;
}
Device::Device(unsigned major, unsigned minor)
: m_major(major)
, m_minor(minor)
{
u32 device_id = encoded_device(major, minor);
auto it = all_devices().find(device_id);
if (it != all_devices().end()) {
dbgln("Already registered {},{}: {}", major, minor, it->value->class_name());
}
VERIFY(!all_devices().contains(device_id));
all_devices().set(device_id, this);
}
Device::~Device()
{
all_devices().remove(encoded_device(m_major, m_minor));
}
String Device::absolute_path() const
{
// FIXME: Don't assume mount point for DevFs
return String::formatted("/dev/{}", device_name());
}
String Device::absolute_path(const FileDescription&) const
{
return absolute_path();
}
void Device::process_next_queued_request(Badge<AsyncDeviceRequest>, const AsyncDeviceRequest& completed_request)
{
ScopedSpinlock lock(m_requests_lock);
VERIFY(!m_requests.is_empty());
VERIFY(m_requests.first().ptr() == &completed_request);
m_requests.remove(m_requests.begin());
if (!m_requests.is_empty()) {
auto* next_request = m_requests.first().ptr();
next_request->do_start(move(lock));
}
evaluate_block_conditions();
}
}
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