per_cpu.hpp

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#pragma once
 
#include <cpu_io.h>
#include <etl/singleton.h>
#include <unistd.h>
 
#include <array>
#include <atomic>
#include <cstddef>
#include <cstdint>
#include <cstdlib>
 
struct TaskControlBlock;
struct CpuSchedData;
 
namespace per_cpu {
 
struct PerCpu {
  size_t core_id{0};
 
  TaskControlBlock* running_task{nullptr};
  TaskControlBlock* idle_task{nullptr};
  CpuSchedData* sched_data{nullptr};
 
  explicit PerCpu(size_t id) : core_id(id) {}
 
  PerCpu() = default;
  PerCpu(const PerCpu&) = default;
  PerCpu(PerCpu&&) = default;
  auto operator=(const PerCpu&) -> PerCpu& = default;
  auto operator=(PerCpu&&) -> PerCpu& = default;
  ~PerCpu() = default;
} __attribute__((aligned(SIMPLEKERNEL_PER_CPU_ALIGN_SIZE)));
 
static_assert(sizeof(PerCpu) <= SIMPLEKERNEL_PER_CPU_ALIGN_SIZE,
              "PerCpu size should not exceed cache line size");
 
using PerCpuArraySingleton =
    etl::singleton<std::array<PerCpu, SIMPLEKERNEL_MAX_CORE_COUNT>>;
 
static __always_inline auto GetCurrentCore() -> PerCpu& {
  return PerCpuArraySingleton::instance()[cpu_io::GetCurrentCoreId()];
}
 
}  // namespace per_cpu