feat(kernel): add Singleton

Signed-off-by: Zone.N <[email protected]>

src/kernel/arch/riscv64/arch_main.cpp

@@ -31,12 +31,12 @@ uint32_t ArchInit(uint32_t argc, uint8_t *argv) {
   printf("boot hart id: %d\n", argc);
   printf("dtb info addr: %p\n", argv);
 
-  kKernelFdt = KernelFdt((uint64_t)argv);
+  kKernelFdt.getInstance() = KernelFdt((uint64_t)argv);
 
-  auto [memory_base, memory_size] = kKernelFdt.GetMemory();
+  auto [memory_base, memory_size] = kKernelFdt.getInstance().GetMemory();
   printf("Memory address = 0x%p, size = 0x%X\n", memory_base, memory_size);
 
-  auto [serial_base, serial_size] = kKernelFdt.GetSerial();
+  auto [serial_base, serial_size] = kKernelFdt.getInstance().GetSerial();
   auto uart = Ns16550a(serial_base);
   uart.PutChar('H');
   uart.PutChar('e');

src/kernel/include/kernel_fdt.hpp

@@ -35,6 +35,7 @@
 
 #include "cstdio"
 #include "cstring"
+#include "singleton.hpp"
 
 /**
  * elf 文件相关
@@ -139,6 +140,6 @@ class KernelFdt {
 };
 
 /// 全局 elf 对象，需要在相应体系结构初始化时重新初始化
-[[maybe_unused]] static KernelFdt kKernelFdt;
+[[maybe_unused]] static Singleton<KernelFdt> kKernelFdt;
 
 #endif /* SIMPLEKERNEL_SRC_KERNEL_INCLUDE_KERNEL_FDT_HPP_ */

src/kernel/include/singleton.hpp

@@ -0,0 +1,47 @@
+
+/**
+ * @file singleton.hpp
+ * @brief 单例模版
+ * @author Zone.N ([email protected])
+ * @version 1.0
+ * @date 2023-07-15
+ * @copyright MIT LICENSE
+ * https://github.com/Simple-XX/SimpleKernel
+ * @par change log:
+ * <table>
+ * <tr><th>Date<th>Author<th>Description
+ * <tr><td>2023-07-15<td>Zone.N ([email protected])<td>创建文件
+ * </table>
+ */
+
+#ifndef SIMPLEKERNEL_SRC_KERNEL_INCLUDE_SINGLETON_HPP_
+#define SIMPLEKERNEL_SRC_KERNEL_INCLUDE_SINGLETON_HPP_
+
+#include <atomic>
+#include <cstddef>
+#include <cstdint>
+
+// 单例模板类
+template <typename T>
+class Singleton {
+ public:
+  // 获取单例实例的静态方法
+  static T& getInstance() {
+    static T instance;
+    return instance;
+  }
+
+  Singleton() = default;
+  ~Singleton() = default;
+
+ private:
+  /// @name 构造/析构函数
+  /// @{
+  Singleton(const Singleton&) = delete;
+  Singleton(Singleton&&) = delete;
+  auto operator=(const Singleton&) -> Singleton& = delete;
+  auto operator=(Singleton&&) -> Singleton& = delete;
+  /// @}
+};
+
+#endif /* SIMPLEKERNEL_SRC_KERNEL_INCLUDE_SINGLETON_HPP_ */