1 files changed, 66 insertions, 0 deletions
diff --git a/lume-legacy/src/kernel/timer.cc b/lume-legacy/src/kernel/timer.cc
new file mode 100644
index 0000000..fc02f27
--- /dev/null
+++ b/lume-legacy/src/kernel/timer.cc
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard QIn
+ */
+#include "common/types.h"
+#include "kernel/config.h"
+#include "kernel/spinlock.h"
+#include "kernel/proc.h"
+#include "kernel/sbi.h"
+
+#define INTERVAL 1000000
+
+namespace Timer
+{
+    uint64 ticks;
+    Spinlock tickslock;
+
+    uint64 get_time()
+    {
+        uint64 time;
+        asm volatile("rdtime %0" : "=r"(time));
+        return time;
+    }
+
+    void set_next_trigger()
+    {
+        SBI::set_timer(get_time() + INTERVAL);
+    }
+
+    void init()
+    {
+        set_next_trigger();
+
+        uint64 sie;
+        asm volatile("csrr %0, sie" : "=r"(sie));
+        sie |= (1L << 5);
+        asm volatile("csrw sie, %0" : : "r"(sie));
+    }
+
+    void tick()
+    {
+        tickslock.acquire();
+        ticks++;
+        ProcManager::wakeup(&ticks);
+        tickslock.release();
+        set_next_trigger();
+    }
+
+    uint64 get_ticks()
+    {
+        tickslock.acquire();
+        uint64 t = ticks;
+        tickslock.release();
+        return t;
+    }
+
+    Spinlock *get_lock()
+    {
+        return &tickslock;
+    }
+
+    void *get_tick_chan()
+    {
+        return &ticks;
+    }
+}
+\ No newline at end of file