Index: kernel/generic/include/ddi/irq.h
===================================================================
--- kernel/generic/include/ddi/irq.h	(revision b77ce846fff6014d76b815421e18b3d5a97d502d)
+++ kernel/generic/include/ddi/irq.h	(revision 561112fadd995d6c1b51528199f60e9f7747bc95)
@@ -77,5 +77,26 @@
 	 */
 	CMD_PIO_WRITE_A_32,
-	
+
+	/** Read 1 byte from the memory space. */
+	CMD_MEM_READ_8,
+	/** Read 2 bytes from the memory space. */
+	CMD_MEM_READ_16,
+	/** Read 4 bytes from the memory space. */
+	CMD_MEM_READ_32,
+
+	/** Write 1 byte to the memory space. */
+	CMD_MEM_WRITE_8,
+	/** Write 2 bytes to the memory space. */
+	CMD_MEM_WRITE_16,
+	/** Write 4 bytes to the memory space. */
+	CMD_MEM_WRITE_32,
+
+	/** Write 1 byte from the source argument to the memory space. */
+	CMD_MEM_WRITE_A_8,
+	/** Write 2 bytes from the source argument to the memory space. */
+	CMD_MEM_WRITE_A_16,
+	/** Write 4 bytes from the source argument to the memory space. */
+	CMD_MEM_WRITE_A_32,
+
 	/**
 	 * Perform a bit masking on the source argument