From cda0a63ab56d9b46577a58958cb01418e2d668f2 Mon Sep 17 00:00:00 2001
From: wdfk-prog <1425075683@qq.com>
Date: Mon, 9 Mar 2026 09:25:01 +0800
Subject: refactor(core): Move __rt_fls to kservice

---
 src/kservice.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

(limited to 'src')

diff --git a/src/kservice.c b/src/kservice.c
index 29c9022c89..60806ce82a 100644
--- a/src/kservice.c
+++ b/src/kservice.c
@@ -1103,6 +1103,50 @@ rt_weak void rt_free_align(void *ptr)
 RTM_EXPORT(rt_free_align);
 #endif /* RT_USING_HEAP */
 
+/**
+ * fls - find last (most-significant) bit set
+ * @x: the word to search
+ *
+ * This is defined the same way as ffs.
+ * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
+ */
+
+int __rt_fls(int val)
+{
+    int bit = 32;
+
+    if (!val)
+    {
+        return 0;
+    }
+    if (!(val & 0xffff0000u))
+    {
+        val <<= 16;
+        bit -= 16;
+    }
+    if (!(val & 0xff000000u))
+    {
+        val <<= 8;
+        bit -= 8;
+    }
+    if (!(val & 0xf0000000u))
+    {
+        val <<= 4;
+        bit -= 4;
+    }
+    if (!(val & 0xc0000000u))
+    {
+        val <<= 2;
+        bit -= 2;
+    }
+    if (!(val & 0x80000000u))
+    {
+        bit -= 1;
+    }
+
+    return bit;
+}
+
 #ifndef RT_USING_CPU_FFS
 #ifdef RT_USING_TINY_FFS
 const rt_uint8_t __lowest_bit_bitmap[] =
-- 
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