From d6e86a67bbf791d19d7637cdcca69de3904470af Mon Sep 17 00:00:00 2001
From: zhouji <956133287@qq.com>
Date: Mon, 24 May 2021 17:09:29 +0800
Subject: [add] 在cortex-a中增加，打开RT_USING_CPU_FFS宏定义时的_rt_ffs实现。
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---
 libcpu/arm/cortex-a/cpu.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'libcpu/arm')

diff --git a/libcpu/arm/cortex-a/cpu.c b/libcpu/arm/cortex-a/cpu.c
index 7367bddd9f..c95c58a13c 100644
--- a/libcpu/arm/cortex-a/cpu.c
+++ b/libcpu/arm/cortex-a/cpu.c
@@ -75,4 +75,21 @@ RT_WEAK void rt_hw_cpu_shutdown()
     }
 }
 
+#ifdef RT_USING_CPU_FFS
+/**
+ * This function finds the first bit set (beginning with the least significant bit)
+ * in value and return the index of that bit.
+ *
+ * Bits are numbered starting at 1 (the least significant bit).  A return value of
+ * zero from any of these functions means that the argument was zero.
+ *
+ * @return return the index of the first bit set. If value is 0, then this function
+ * shall return 0.
+ */
+int __rt_ffs(int value)
+{
+    return __builtin_ffs(value);
+}
+#endif
+
 /*@}*/
-- 
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