device_node.hpp

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#pragma once
 
#include <concepts>
#include <cstddef>
#include <cstdint>
 
#include "expected.hpp"
 
enum class BusType : uint8_t { kPlatform, kPci, kAcpi };
 
enum class DeviceType : uint8_t {
  kChar,
  kBlock,
  kNet,
  kPlatform,
};
 
namespace vfs {
class BlockDevice;
}  // namespace vfs
 
struct DeviceNode {
  char name[32]{};
 
  BusType bus_type{BusType::kPlatform};
  DeviceType type{DeviceType::kPlatform};
 
  uint64_t mmio_base{0};
  size_t mmio_size{0};
 
  uint32_t irq{0};
 
  char compatible[128]{};
  size_t compatible_len{0};
 
  uint32_t dev_id{0};
 
  bool bound{false};
 
  vfs::BlockDevice* block_device{nullptr};
};
 
template <typename B>
concept Bus = requires(B b, DeviceNode* out, size_t max) {
  { b.Enumerate(out, max) } -> std::same_as<Expected<size_t>>;
  { B::GetName() } -> std::same_as<const char*>;
};