:new: 新增内存拷贝函数memcpy

kernel/common/glib.h

@@ -134,6 +134,37 @@ void *memset(void *dst, unsigned char C, ul Count)
                          : "memory");
     return dst;
 }
+
+/**
+ * @brief 内存拷贝函数
+ * 
+ * @param dst 目标数组
+ * @param src 源数组
+ * @param Num 字节数
+ * @return void* 
+ */
+void * memcpy(void *dst,void * src,long Num)
+{
+	int d0,d1,d2;
+	__asm__ __volatile__	(	"cld	\n\t"
+					"rep	\n\t"
+					"movsq	\n\t"
+					"testb	$4,%b4	\n\t"
+					"je	1f	\n\t"
+					"movsl	\n\t"
+					"1:\ttestb	$2,%b4	\n\t"
+					"je	2f	\n\t"
+					"movsw	\n\t"
+					"2:\ttestb	$1,%b4	\n\t"
+					"je	3f	\n\t"
+					"movsb	\n\t"
+					"3:	\n\t"
+					:"=&c"(d0),"=&D"(d1),"=&S"(d2)
+					:"0"(Num/8),"q"(Num),"1"(src),"2"(dst)
+					:"memory"
+				);
+	return dst;
+}
 void *memset_c(void *dst, unsigned char c, ul n)
 {
     unsigned char *s = (unsigned char *)dst;
@@ -184,4 +215,5 @@ void io_out32(unsigned short port,unsigned int value)
 				:
 				:"a"(value),"d"(port)
 				:"memory");
-}
+}
+