*** 3000physicalview.c	2020-03-21 15:40:39.000000000 -0400
--- 3000physicalview-read.c	2025-04-07 21:15:46.907971456 -0400
***************
*** 23,28 ****
--- 23,29 ----
  static struct device *device = NULL;
  static struct class *class   = NULL;
  static int major_number;
+ static unsigned long addr = 0; //before any writes
  
  /* Helper functions below this line ---------------- */
  
***************
*** 147,157 ****
--- 148,200 ----
      return 0;
  }
  
+ static ssize_t physicalview_write(struct file *f, const char *buf, size_t len, loff_t *offset)
+ {
+ 	if(kstrtoul_from_user(buf, len>255?255:len, 0, &addr))
+ 		addr = 0;
+         *offset += len;
+ 	printk("GOT: %ld\n", addr);
+         return (ssize_t) *offset;
+ }
+ 
+ static ssize_t physicalview_read(struct file *f, char *buf, size_t len, loff_t *offset)
+ {
+         size_t i, msglen;
+         unsigned long phys = 0;
+ 
+         char message[100];
+ 
+         if (*offset > 0) {
+                 return 0;
+         }
+ 	
+ 	phys = get_physical(addr);
+ 
+         snprintf(message, 100, "The physical address is 0x%lx!\n", phys);
+ 
+         msglen = strlen(message);
+ 
+         if (len < msglen) {
+                 msglen = len;
+         }
+ 
+         for (i = 0; i < msglen; i++) {
+                 put_user(message[i], buf++);
+         }
+ 
+         *offset = i;
+ 
+         return i;
+ }
+ 
+ 
  /* Register file operations */
  static struct file_operations fops = {
      .open = physicalview_open,
      .release = physicalview_release,
      .unlocked_ioctl = physicalview_ioctl,
+     .read = physicalview_read,
+     .write = physicalview_write,
  };
  
  /* World readable and writable because... security? */