diff --git a/cleonos/c/apps/shell/shell_cmd.c b/cleonos/c/apps/shell/shell_cmd.c
index 81cc6ca..b0eb567 100644
--- a/cleonos/c/apps/shell/shell_cmd.c
+++ b/cleonos/c/apps/shell/shell_cmd.c
@@ -132,6 +132,7 @@ static int ush_cmd_help(void) {
     ush_writeln("  wait <pid>");
     ush_writeln("  sleep <ticks>");
     ush_writeln("  yield");
+    ush_writeln("  shutdown / restart");
     ush_writeln("  exit [code]");
     ush_writeln("  rusttest / panic / elfloader (kernel shell only)");
     ush_writeln("edit keys: Left/Right, Home/End, Up/Down history");
@@ -376,6 +377,19 @@ static int ush_cmd_yield(void) {
     return 1;
 }
 
+
+static int ush_cmd_shutdown(void) {
+    ush_writeln("shutdown: powering off...");
+    (void)cleonos_sys_shutdown();
+    return 1;
+}
+
+static int ush_cmd_restart(void) {
+    ush_writeln("restart: rebooting...");
+    (void)cleonos_sys_restart();
+    return 1;
+}
+
 static int ush_cmd_exit(ush_state *sh, const char *arg) {
     u64 code = 0ULL;
 
@@ -874,6 +888,10 @@ void ush_execute_line(ush_state *sh, const char *line) {
         success = ush_cmd_sleep(arg);
     } else if (ush_streq(cmd, "yield") != 0) {
         success = ush_cmd_yield();
+    } else if (ush_streq(cmd, "shutdown") != 0 || ush_streq(cmd, "poweroff") != 0) {
+        success = ush_cmd_shutdown();
+    } else if (ush_streq(cmd, "restart") != 0 || ush_streq(cmd, "reboot") != 0) {
+        success = ush_cmd_restart();
     } else if (ush_streq(cmd, "exit") != 0) {
         success = ush_cmd_exit(sh, arg);
     } else if (ush_streq(cmd, "clear") != 0 || ush_streq(cmd, "cls") != 0) {
diff --git a/cleonos/c/include/cleonos_syscall.h b/cleonos/c/include/cleonos_syscall.h
index 1258c77..9f361e8 100644
--- a/cleonos/c/include/cleonos_syscall.h
+++ b/cleonos/c/include/cleonos_syscall.h
@@ -52,6 +52,8 @@ typedef unsigned long long usize;
 #define CLEONOS_SYSCALL_EXIT                43ULL
 #define CLEONOS_SYSCALL_SLEEP_TICKS         44ULL
 #define CLEONOS_SYSCALL_YIELD               45ULL
+#define CLEONOS_SYSCALL_SHUTDOWN            46ULL
+#define CLEONOS_SYSCALL_RESTART             47ULL
 
 u64 cleonos_syscall(u64 id, u64 arg0, u64 arg1, u64 arg2);
 u64 cleonos_sys_log_write(const char *message, u64 length);
@@ -99,5 +101,7 @@ u64 cleonos_sys_wait_pid(u64 pid, u64 *out_status);
 u64 cleonos_sys_exit(u64 status);
 u64 cleonos_sys_sleep_ticks(u64 ticks);
 u64 cleonos_sys_yield(void);
+u64 cleonos_sys_shutdown(void);
+u64 cleonos_sys_restart(void);
 
-#endif
\ No newline at end of file
+#endif
diff --git a/cleonos/c/src/syscall.c b/cleonos/c/src/syscall.c
index 686f78d..46966b4 100644
--- a/cleonos/c/src/syscall.c
+++ b/cleonos/c/src/syscall.c
@@ -191,4 +191,11 @@ u64 cleonos_sys_sleep_ticks(u64 ticks) {
 
 u64 cleonos_sys_yield(void) {
     return cleonos_syscall(CLEONOS_SYSCALL_YIELD, 0ULL, 0ULL, 0ULL);
-}
\ No newline at end of file
+}
+u64 cleonos_sys_shutdown(void) {
+    return cleonos_syscall(CLEONOS_SYSCALL_SHUTDOWN, 0ULL, 0ULL, 0ULL);
+}
+
+u64 cleonos_sys_restart(void) {
+    return cleonos_syscall(CLEONOS_SYSCALL_RESTART, 0ULL, 0ULL, 0ULL);
+}
diff --git a/clks/include/clks/syscall.h b/clks/include/clks/syscall.h
index dde8f91..2e123f0 100644
--- a/clks/include/clks/syscall.h
+++ b/clks/include/clks/syscall.h
@@ -49,6 +49,8 @@
 #define CLKS_SYSCALL_EXIT                43ULL
 #define CLKS_SYSCALL_SLEEP_TICKS         44ULL
 #define CLKS_SYSCALL_YIELD               45ULL
+#define CLKS_SYSCALL_SHUTDOWN            46ULL
+#define CLKS_SYSCALL_RESTART             47ULL
 
 void clks_syscall_init(void);
 u64 clks_syscall_dispatch(void *frame_ptr);
diff --git a/clks/kernel/syscall.c b/clks/kernel/syscall.c
index 4bb91d0..92a3143 100644
--- a/clks/kernel/syscall.c
+++ b/clks/kernel/syscall.c
@@ -1,3 +1,4 @@
+#include <clks/cpu.h>
 #include <clks/exec.h>
 #include <clks/fs.h>
 #include <clks/heap.h>
@@ -51,6 +52,17 @@ static clks_bool clks_syscall_ready = CLKS_FALSE;
 static clks_bool clks_syscall_user_trace_active = CLKS_FALSE;
 static u64 clks_syscall_user_trace_budget = 0ULL;
 
+#if defined(CLKS_ARCH_X86_64)
+static inline void clks_syscall_outb(u16 port, u8 value) {
+    __asm__ volatile("outb %0, %1" : : "a"(value), "Nd"(port));
+}
+
+static inline void clks_syscall_outw(u16 port, u16 value) {
+    __asm__ volatile("outw %0, %1" : : "a"(value), "Nd"(port));
+}
+#endif
+
+
 static clks_bool clks_syscall_copy_user_string(u64 src_addr, char *dst, usize dst_size) {
     const char *src = (const char *)src_addr;
     usize i = 0U;
@@ -247,6 +259,27 @@ static u64 clks_syscall_yield(void) {
     return clks_exec_yield();
 }
 
+static u64 clks_syscall_shutdown(void) {
+    clks_log(CLKS_LOG_WARN, "SYSCALL", "SHUTDOWN REQUESTED BY USERLAND");
+    clks_serial_write("[WARN][SYSCALL] SHUTDOWN REQUESTED\n");
+#if defined(CLKS_ARCH_X86_64)
+    clks_syscall_outw(0x604U, 0x2000U);
+#endif
+    clks_cpu_halt_forever();
+    return 1ULL;
+}
+
+static u64 clks_syscall_restart(void) {
+    clks_log(CLKS_LOG_WARN, "SYSCALL", "RESTART REQUESTED BY USERLAND");
+    clks_serial_write("[WARN][SYSCALL] RESTART REQUESTED\n");
+#if defined(CLKS_ARCH_X86_64)
+    clks_syscall_outb(0x64U, 0xFEU);
+#endif
+    clks_cpu_halt_forever();
+    return 1ULL;
+}
+
+
 static u64 clks_syscall_fs_stat_type(u64 arg0) {
     char path[CLKS_SYSCALL_PATH_MAX];
     struct clks_fs_node_info info;
@@ -545,6 +578,10 @@ u64 clks_syscall_dispatch(void *frame_ptr) {
             return clks_syscall_sleep_ticks(frame->rbx);
         case CLKS_SYSCALL_YIELD:
             return clks_syscall_yield();
+        case CLKS_SYSCALL_SHUTDOWN:
+            return clks_syscall_shutdown();
+        case CLKS_SYSCALL_RESTART:
+            return clks_syscall_restart();
         default:
             return (u64)-1;
     }
diff --git a/docs/syscall.md b/docs/syscall.md
index 0383200..3e8ef97 100644
--- a/docs/syscall.md
+++ b/docs/syscall.md
@@ -52,7 +52,7 @@ u64 cleonos_syscall(u64 id, u64 arg0, u64 arg1, u64 arg2);
 
 - `FS_MKDIR` / `FS_WRITE` / `FS_APPEND` / `FS_REMOVE` 仅允许 `/temp` 树下路径。
 
-## 4. Syscall 列表（0~45）
+## 4. Syscall 列表（0~47）
 
 ### 0 `CLEONOS_SYSCALL_LOG_WRITE`
 
@@ -209,7 +209,7 @@ u64 cleonos_syscall(u64 id, u64 arg0, u64 arg1, u64 arg2);
 - 参数：无
 - 返回：
 - 无输入时 `-1`
-- 有输入时返回字符值（低 8 位）
+- 有输入时返回字符值（低 8 位；按当前进程/TTY 上下文读取）
 
 ### 27 `CLEONOS_SYSCALL_FS_STAT_TYPE`
 
@@ -306,7 +306,7 @@ u64 cleonos_syscall(u64 id, u64 arg0, u64 arg1, u64 arg2);
 - 返回：
 - 成功：子进程 PID
 - 失败：`-1`
-- 说明：当前 Stage27 为同步 spawn（内部会执行完成后再返回 PID）。
+- 说明：当前实现为异步 spawn（进入 pending 队列，后续由调度 tick 派发执行）。
 
 ### 42 `CLEONOS_SYSCALL_WAITPID`
 
@@ -338,6 +338,18 @@ u64 cleonos_syscall(u64 id, u64 arg0, u64 arg1, u64 arg2);
 - 参数：无
 - 返回：当前 tick
 
+### 46 `CLEONOS_SYSCALL_SHUTDOWN`
+
+- 参数：无
+- 返回：理论上不返回；成功路径会触发关机流程（当前 x86_64 走 QEMU/ACPI 关机端口）
+- 说明：若关机流程未生效，内核会进入 halt 循环。
+
+### 47 `CLEONOS_SYSCALL_RESTART`
+
+- 参数：无
+- 返回：理论上不返回；成功路径会触发重启流程（当前 x86_64 走 8042 reset）
+- 说明：若重启流程未生效，内核会进入 halt 循环。
+
 ## 5. 用户态封装函数
 
 用户态封装位于：
@@ -353,10 +365,10 @@ u64 cleonos_syscall(u64 id, u64 arg0, u64 arg1, u64 arg2);
 - `cleonos_sys_tty_write()`
 - `cleonos_sys_kbd_get_char()` / `cleonos_sys_kbd_buffered()`
 - `cleonos_sys_getpid()` / `cleonos_sys_spawn_path()` / `cleonos_sys_wait_pid()`
-- `cleonos_sys_exit()` / `cleonos_sys_sleep_ticks()` / `cleonos_sys_yield()`
+- `cleonos_sys_exit()` / `cleonos_sys_sleep_ticks()` / `cleonos_sys_yield()` / `cleonos_sys_shutdown()` / `cleonos_sys_restart()`
 
 ## 6. 开发注意事项
 
 - 传入的字符串/缓冲指针目前按“同地址空间可直接访问”模型处理，后续若引入严格用户态地址隔离，需要补充用户内存校验。
 - `FS_READ` 不保证文本终止符；读取文本请预留 1 字节并手动 `buf[n] = '\0'`。
-- `FS_WRITE`/`FS_APPEND` 仅允许 `/temp`，并有单次长度上限。`n
\ No newline at end of file
+- `FS_WRITE`/`FS_APPEND` 仅允许 `/temp`，并有单次长度上限。
diff --git a/wine/cleonos_wine_lib/constants.py b/wine/cleonos_wine_lib/constants.py
index bf49464..b49f449 100644
--- a/wine/cleonos_wine_lib/constants.py
+++ b/wine/cleonos_wine_lib/constants.py
@@ -54,6 +54,8 @@ SYS_WAITPID = 42
 SYS_EXIT = 43
 SYS_SLEEP_TICKS = 44
 SYS_YIELD = 45
+SYS_SHUTDOWN = 46
+SYS_RESTART = 47
 
 
 def u64(value: int) -> int:
diff --git a/wine/cleonos_wine_lib/runner.py b/wine/cleonos_wine_lib/runner.py
index 87e9c48..9744c01 100644
--- a/wine/cleonos_wine_lib/runner.py
+++ b/wine/cleonos_wine_lib/runner.py
@@ -25,6 +25,8 @@ from .constants import (
     SYS_SPAWN_PATH,
     SYS_WAITPID,
     SYS_YIELD,
+    SYS_SHUTDOWN,
+    SYS_RESTART,
     SYS_FS_APPEND,
     SYS_FS_CHILD_COUNT,
     SYS_FS_GET_CHILD_NAME,
@@ -256,6 +258,16 @@ class CLeonOSWineNative:
             return self._sleep_ticks(arg0)
         if sid == SYS_YIELD:
             return self._yield_once()
+        if sid == SYS_SHUTDOWN:
+            self._host_write("\n[WINE] shutdown requested by guest\n")
+            self._exit_requested = True
+            self._exit_status = 0
+            return 1
+        if sid == SYS_RESTART:
+            self._host_write("\n[WINE] restart requested by guest\n")
+            self._exit_requested = True
+            self._exit_status = 0
+            return 1
         if sid == SYS_EXEC_REQUESTS:
             return self.state.exec_requests
         if sid == SYS_EXEC_SUCCESS:
@@ -874,4 +886,4 @@ def resolve_elf_target(elf_arg: str, rootfs: Path) -> Tuple[Path, str]:
     host_path = _guest_to_host_for_resolve(rootfs, guest_path)
     if host_path is None:
         raise FileNotFoundError(f"ELF not found as host path or guest path: {elf_arg}")
-    return host_path.resolve(), guest_path
\ No newline at end of file
+    return host_path.resolve(), guest_path