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#include "kapi/devices.hpp"
#include "kapi/system.hpp"
#include "kernel/devices/root_bus.hpp"
#include <kstd/flat_map>
#include <kstd/memory>
#include <kstd/print>
#include <atomic>
#include <cstddef>
#include <optional>
#include <string_view>
#include <utility>
namespace kapi::devices
{
namespace
{
auto constinit next_major_number = std::atomic_size_t{0};
auto constinit root_bus = std::optional<kernel::devices::root_bus>{};
auto constinit device_tree = kstd::flat_map<std::pair<std::size_t, std::size_t>, kstd::observer_ptr<device>>{};
} // namespace
auto init() -> void
{
auto static is_initialized = std::atomic_flag{};
if (is_initialized.test_and_set())
{
return;
}
auto & bus = root_bus.emplace();
register_device(bus);
bus.init();
}
auto get_root_bus() -> bus &
{
if (!root_bus.has_value())
{
kapi::system::panic("[OS:DEV] Root bus not initialized!");
}
return *root_bus;
}
auto allocate_major_number() -> std::size_t
{
return next_major_number++;
}
auto register_device(device & device) -> bool
{
kstd::println("[OS:DEV] Registering device {}@{}:{}", device.name(), device.major(), device.minor());
return device_tree.emplace(std::pair{device.major(), device.minor()}, &device).second;
}
auto unregister_device(device &) -> bool
{
kstd::println("[OS:DEV] TODO: implement device deregistration");
return false;
}
auto find_device(std::size_t major, std::size_t minor) -> kstd::observer_ptr<device>
{
if (device_tree.contains(std::pair{major, minor}))
{
return device_tree.at(std::pair{major, minor});
}
return nullptr;
}
auto find_device(std::string_view name) -> kstd::observer_ptr<device>
{
for (auto const & [key, value] : device_tree)
{
if (value->name() == name)
{
return value;
}
}
return nullptr;
}
} // namespace kapi::devices
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