5 files changed, 192 insertions, 0 deletions
diff --git a/sem3/osc/mm1/.gitignore b/sem3/osc/mm1/.gitignore
new file mode 100644
index 0000000..b18a498
--- /dev/null
+++ b/sem3/osc/mm1/.gitignore
@@ -0,0 +1,10 @@
+jmod.ko
+.jmod.ko.cmd
+jmod.mod.c
+jmod.mod.o
+.jmod.mod.o.cmd
+jmod.o
+.jmod.o.cmd
+modules.order
+Module.symvers
+.tmp_versions
diff --git a/sem3/osc/mm1/mm1/Makefile b/sem3/osc/mm1/mm1/Makefile
new file mode 100644
index 0000000..13c8e62
--- /dev/null
+++ b/sem3/osc/mm1/mm1/Makefile
@@ -0,0 +1,7 @@
+obj-m += jmod.o
+
+all:
+	make -C /lib/modules/$(shell uname -r)/build M=$(shell pwd) modules
+clean:
+	make -C /lib/modules/$(shell uname -r)/build M=$(shell pwd) clean
+
diff --git a/sem3/osc/mm1/mm1/Readme.md b/sem3/osc/mm1/mm1/Readme.md
new file mode 100644
index 0000000..fcc6cb3
--- /dev/null
+++ b/sem3/osc/mm1/mm1/Readme.md
@@ -0,0 +1,34 @@
+# Opgaver til operativ systemer
+
+Ligenu er det ikke delt op i mapper. 
+
+## Kør mini kernel modul
+
+Compile med make.
+Husk at peg makefile på din kernel modul mappe.
+Denne er testet på ubuntu server 19.04.
+
+```
+make
+```
+
+Nu burde der være kommet et jmod.ko som kan loades med.
+
+```
+sudo insmod jmod.ko
+```
+
+Hvis du får permission denied kan du få flere information ved at checke `dmesg` loggen.
+
+Nu kan du hente major number ind fra dmesg. Led efter `COOL_MODULE:`.
+Dette nummer bruger du til at assign den en node
+
+```
+sudo mknod /dev/cooldev c MAJOR 0
+```
+
+Dette vil map kernel-modul/driver til cooldev i /dev/ mappen.
+Husk at skriv til MAJOR nummer fra `dmesg` i stedet for MAJOR.
+
+Hvis man læser man pagen kan man se at det bliver lavet som en character unbuffered file. 
+MINOR nummeret er 0 da vores driver alligevel ikke bruger det til noget.
diff --git a/sem3/osc/mm1/mm1/jmod.c b/sem3/osc/mm1/mm1/jmod.c
new file mode 100644
index 0000000..a07077c
--- /dev/null
+++ b/sem3/osc/mm1/mm1/jmod.c
@@ -0,0 +1,70 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <asm/uaccess.h>
+
+static int major_num;
+static int busy;
+
+
+static int cool_open(struct inode *inode, struct file *file) {
+	/* Check if we are already serving someone */
+	if (busy) {
+		return -EBUSY;
+	}
+
+	busy = 1;
+	return 0;
+}
+
+static int cool_release (struct inode *inode, struct file *file) {
+	busy = 0;
+
+	return 0;
+}
+
+static ssize_t cool_read (struct file *filp, char *buffer, size_t len, loff_t *offset) {
+
+	char str[12] = "hej med dig";
+	int i;
+
+	for (i = 0; i < len; i++) {
+		put_user(str[i % 12], buffer++);
+	}
+
+	return i;
+}
+
+static struct file_operations file_ops = {
+	.owner = THIS_MODULE,
+	.read = cool_read,
+	.open = cool_open,
+	.release = cool_release
+};
+
+static int __init jmod_init(void) 
+{
+	printk(KERN_INFO "COOL_MODULE: Registering cooldev\n");
+	
+	major_num = register_chrdev(0, "cooldev", &file_ops);
+	if (major_num < 0) {
+		printk(KERN_ERR "COOL_MODULE: Could not register major\n");
+		return 1;
+	}
+
+	printk(KERN_INFO "COOL_MODULE: Got major %d\n", major_num);
+
+	return 0;
+}
+
+
+static void __exit jmod_exit(void) 
+{
+	printk(KERN_INFO "COOL_MODULE: Nou moe\n");
+	unregister_chrdev(major_num, "cooldev");
+}
+
+module_init( jmod_init );
+module_exit( jmod_exit );
+
diff --git a/sem3/osc/mm1/mm2/tprog.c b/sem3/osc/mm1/mm2/tprog.c
new file mode 100644
index 0000000..377555f
--- /dev/null
+++ b/sem3/osc/mm1/mm2/tprog.c
@@ -0,0 +1,71 @@
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+
+#define STARTSEC 10
+#define ENDUSEC 500000
+#define SPEED 0.8
+
+struct itimerval timer;
+
+void timer_handler(int signum) {
+    /* Handy structure reference */
+    struct timeval *tv = &timer.it_value;
+    printf("Hey we hit the alarm\n\a");
+
+    /* Calculate new alarm */
+    tv->tv_sec *= SPEED;
+    if (tv->tv_sec == 0) {
+	/* If tv_usec is 0 set i to 1 sec otherwise half it */
+	if (tv->tv_usec == 0) {
+	    tv->tv_usec = 999999;
+	} else if (tv->tv_usec > ENDUSEC) {
+	    tv->tv_usec *= SPEED;
+	    if (tv->tv_usec < ENDUSEC) {
+		tv->tv_usec = ENDUSEC;
+	    }
+	} else {
+	    /* Return letting the timer be set to ENDUSEC */
+	    return;
+	}
+    }
+
+    printf("Set to %d and %d\n", timer.it_value.tv_sec, timer.it_value.tv_usec);
+    /* Set alarm */
+    int err = setitimer(ITIMER_REAL, &timer, NULL);
+    if (err) {
+	printf("Hey we got an error guys\n");
+	exit(1);
+    }
+}
+
+int main() {
+    /* Setup handler for timer */
+    struct sigaction sa;
+    memset(&sa, 0, sizeof(sa)); /* Remeber to set all fields to zero */
+
+    sa.sa_handler = &timer_handler;
+    sigaction(SIGALRM, &sa, NULL);
+
+    /* Setup timer values */
+    timer.it_value.tv_sec = STARTSEC;
+    timer.it_value.tv_usec = 0;
+
+    timer.it_interval.tv_sec = 0;
+    timer.it_interval.tv_usec = ENDUSEC;
+
+    /* Start the timer */
+    setitimer(ITIMER_REAL, &timer, NULL);
+
+    /* Select signals */
+    sigset_t sigset;
+    sigemptyset(&sigset);
+    sigaddset(&sigset, SIGTERM);
+
+    /* Wait for termination */
+    sigwait(&sigset, NULL);
+
+    return 0;
+}