initial commit

Makefile

@@ -0,0 +1,7 @@
+obj-m += mod_hello.o
+
+all:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+
+clean:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

mod_hello.c

@@ -0,0 +1,64 @@
+#include <linux/module.h>   /* all kernel modules need this */
+#include <linux/init.h>     /* provides initialization routines */
+
+#include <linux/kallsyms.h> 
+
+static char __initdata hellomsg[] = KERN_NOTICE "Hello, Kernel, I'm in\n";
+static char __exitdata byemsg[] = KERN_NOTICE "Bye, I'm out\n";
+
+static int print_hello(void)
+{
+    unsigned long i;
+    char *symbol_name;
+
+    printk(hellomsg);
+
+    symbol_name = "free_pages";
+    printk("looking up '%s'\n", symbol_name);
+    i = kallsyms_lookup_name(symbol_name);
+    printk("%s 0x%lx\n", symbol_name, i);
+
+    return 0;
+}
+
+int fib(int times, int n1, int n2)
+{
+    int i = 0;
+    int prev = n1;
+    int curr = n2;
+    int next = 0;
+
+    while (i < times)
+    {
+        next = (prev + curr);
+        prev = curr;
+        curr = next;
+        i++;
+    }
+
+    return next;
+}
+
+static int __init start_hello_world(void)
+{
+    int f_int;
+    MODULE_LICENSE("GPL");
+    MODULE_AUTHOR("Vincent Batts <vbatts@hashbangbash.com>");
+    MODULE_DESCRIPTION("i am just reading headers");
+    MODULE_VERSION("1.0");
+    print_hello();
+
+    f_int = fib(10000000, 0, 1);
+    
+    return 0;
+}
+
+static void __exit go_away(void)
+{
+    printk(byemsg);
+}
+
+module_init(start_hello_world);
+module_exit(go_away);
+
+// vim:set shiftwidth=4 softtabstop=4 expandtab: