内核线程无限提供数据给 共享内存

home-coder · home-coder · commit 50f404fb5324 · 2017-07-01T12:11:53.000+08:00
diff --git a/helper/kernel/pages.c b/helper/kernel/pages.c
@@ -2,9 +2,22 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
+#include <linux/delay.h>
 
 static unsigned long p = 0;
 static unsigned long pp = 0;
+int count = 0;
+char buf[32];
+
+static int put_pages(void *p)
+{
+	while (1) {
+	msleep(20);
+	sprintf(buf, "hello %d\n", count++ % 1000);
+	strcpy((char *)p, buf);
+	}
+	return 0;
+}
 
 static int __init shao_init(void)
 {
@@ -18,8 +31,7 @@ static int __init shao_init(void)
 	printk("<1> pp = 0x%lx\n", pp);
 
 	//在共享内存中写上一个字符串
-	
-	strcpy((char *)p, "hello\n");
+	kernel_thread(put_pages, (void *)p, 0);
 	return 0;
 }
 
diff --git a/helper/linux/mmap.c b/helper/linux/mmap.c
@@ -6,7 +6,7 @@
 
 #define PAGE_SIZE (4*1024)
 #define PAGE_OFFSET               0xc0000000
-#define KERNEL_VIRT_ADDR 0x20207000	//此处地址即为内核模块打印的地址p，动态的不固定，需要自行修改
+#define KERNEL_VIRT_ADDR 0x22cb7000	//此处地址即为内核模块打印的地址p，动态的不固定，需要自行修改
 
 int main()
 {
@@ -22,6 +22,7 @@ int main()
 	buf = mmap(0, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, phy_addr);
 	if (buf == MAP_FAILED)
 		perror("mmap");
+	while (1)
 	puts(buf);					//打印共享内存的内容
 	munmap(buf, PAGE_SIZE);
 	close(fd);
