From 8ab02c496c09a2a37f9794bc7c87a916ac41464e Mon Sep 17 00:00:00 2001
From: fslongjin <fslongjin@vip.qq.com>
Date: Sat, 29 Jan 2022 15:11:33 +0800
Subject: [PATCH] =?UTF-8?q?:new:=20=E6=96=B0=E5=A2=9E=E5=86=85=E5=AD=98?=
 =?UTF-8?q?=E6=8B=B7=E8=B4=9D=E5=87=BD=E6=95=B0memcpy?=
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---
 kernel/common/glib.h | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/kernel/common/glib.h b/kernel/common/glib.h
index dcfb5bcb..51d7e0b2 100644
--- a/kernel/common/glib.h
+++ b/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");
-}
\ No newline at end of file
+}
+