Store resource lists for drivers. Limited checks to enforce those lists.

kernel/system/do_devio.c

@@ -19,6 +19,46 @@
 PUBLIC int do_devio(m_ptr)
 register message *m_ptr;	/* pointer to request message */
 {
+    struct proc *rp;
+    struct priv *privp;
+    port_t port;
+    struct io_range *iorp;
+    int i, size, nr_io_range;
+
+    rp= proc_addr(m_ptr->m_source);
+    privp= priv(rp);
+    if (!privp)
+    {
+	kprintf("no priv structure!\n");
+	goto doit;
+    }
+    if (privp->s_flags & CHECK_IO_PORT)
+    {
+	switch (m_ptr->DIO_TYPE)
+	{
+	case DIO_BYTE: size= 1; break;
+	case DIO_WORD: size= 2; break;
+	case DIO_LONG: size= 4; break;
+	default: size= 4; break;	/* Be conservative */
+	}
+	port= m_ptr->DIO_PORT;
+	nr_io_range= privp->s_nr_io_range;
+	for (i= 0, iorp= privp->s_io_tab; i<nr_io_range; i++, iorp++)
+	{
+		if (port >= iorp->ior_base && port+size-1 <= iorp->ior_limit)
+			break;
+	}
+	if (i >= nr_io_range)
+	{
+		kprintf(
+		"do_devio: I/O port check failed for proc %d, port 0x%x\n",
+			m_ptr->m_source, port);
+		return EPERM;
+	}
+    }
+
+doit:
+
 /* Process a single I/O request for byte, word, and long values. */
     if (m_ptr->DIO_REQUEST == DIO_INPUT) { 
       switch (m_ptr->DIO_TYPE) {