Index: kernel/generic/src/ipc/irq.c
===================================================================
--- kernel/generic/src/ipc/irq.c	(revision 0d8a304c1941d4b637abf937d8947384c88d0e1c)
+++ kernel/generic/src/ipc/irq.c	(revision 04c418dcaeffd13ea8028c1076db5abe46f4c748)
@@ -174,4 +174,5 @@
 	irq->notif_cfg.code = code;
 	irq->notif_cfg.counter = 0;
+	irq->driver_as = AS;
 	
 	/*
@@ -364,4 +365,25 @@
 		return IRQ_DECLINE;
 	
+#define CMD_MEM_READ(target) \
+do { \
+	void *va = code->cmds[i].addr; \
+	if (AS != irq->driver_as) \
+		as_switch(AS, irq->driver_as); \
+	printf("Copying data from address: %p.\n", va); \
+	memcpy_from_uspace(&target, va, (sizeof(target))); \
+	if (dstarg) \
+		scratch[dstarg] = target; \
+} while(0)
+
+#define CMD_MEM_WRITE(val) \
+do { \
+	void *va = code->cmds[i].addr; \
+	if (AS != irq->driver_as) \
+		as_switch(AS, irq->driver_as); \
+	printf("Writing data to address: %p.\n", va); \
+	memcpy_to_uspace(va, &val, sizeof(val)); \
+} while (0)
+
+	as_t *current_as = AS;
 	size_t i;
 	for (i = 0; i < code->cmdcount; i++) {
@@ -422,4 +444,53 @@
 			}
 			break;
+		case CMD_MEM_READ_8: {
+			uint8_t val;
+			CMD_MEM_READ(val);
+			break;
+			}
+		case CMD_MEM_READ_16: {
+			uint16_t val;
+			CMD_MEM_READ(val);
+			break;
+			}
+		case CMD_MEM_READ_32: {
+			uint32_t val;
+			CMD_MEM_READ(val);
+			printf("mem READ value: %x.\n", val);
+			break;
+			}
+		case CMD_MEM_WRITE_8: {
+			uint8_t val = code->cmds[i].value;
+			CMD_MEM_WRITE(val);
+			break;
+			}
+		case CMD_MEM_WRITE_16: {
+			uint16_t val = code->cmds[i].value;
+			CMD_MEM_WRITE(val);
+			break;
+			}
+		case CMD_MEM_WRITE_32: {
+			uint32_t val = code->cmds[i].value;
+			CMD_MEM_WRITE(val);
+			break;
+			}
+		case CMD_MEM_WRITE_A_8:
+			if (srcarg) {
+				uint8_t val = scratch[srcarg];
+				CMD_MEM_WRITE(val);
+			}
+			break;
+		case CMD_MEM_WRITE_A_16:
+			if (srcarg) {
+				uint16_t val = scratch[srcarg];
+				CMD_MEM_WRITE(val);
+			}
+			break;
+		case CMD_MEM_WRITE_A_32:
+			if (srcarg) {
+				uint32_t val = scratch[srcarg];
+				CMD_MEM_WRITE(val);
+			}
+			break;
 		case CMD_BTEST:
 			if ((srcarg) && (dstarg)) {
@@ -435,10 +506,16 @@
 			break;
 		case CMD_ACCEPT:
+			if (AS != current_as)
+				as_switch(AS, current_as);
 			return IRQ_ACCEPT;
 		case CMD_DECLINE:
 		default:
+			if (AS != current_as)
+				as_switch(AS, current_as);
 			return IRQ_DECLINE;
 		}
 	}
+	if (AS != current_as)
+		as_switch(AS, current_as);
 	
 	return IRQ_DECLINE;
Index: kernel/generic/src/mm/as.c
===================================================================
--- kernel/generic/src/mm/as.c	(revision 0d8a304c1941d4b637abf937d8947384c88d0e1c)
+++ kernel/generic/src/mm/as.c	(revision 04c418dcaeffd13ea8028c1076db5abe46f4c748)
@@ -1964,5 +1964,5 @@
 sysarg_t sys_as_area_create(uintptr_t address, size_t size, unsigned int flags)
 {
-	if (as_area_create(AS, flags | AS_AREA_CACHEABLE, size, address,
+	if (as_area_create(AS, flags, size, address,
 	    AS_AREA_ATTR_NONE, &anon_backend, NULL))
 		return (sysarg_t) address;
Index: kernel/generic/src/mm/page.c
===================================================================
--- kernel/generic/src/mm/page.c	(revision 0d8a304c1941d4b637abf937d8947384c88d0e1c)
+++ kernel/generic/src/mm/page.c	(revision 04c418dcaeffd13ea8028c1076db5abe46f4c748)
@@ -60,4 +60,6 @@
 
 #include <mm/page.h>
+#include <genarch/mm/page_ht.h>
+#include <genarch/mm/page_pt.h>
 #include <arch/mm/page.h>
 #include <arch/mm/asid.h>
@@ -70,4 +72,6 @@
 #include <debug.h>
 #include <arch.h>
+#include <syscall/copy.h>
+#include <errno.h>
 
 /** Virtual operations for page subsystem. */
@@ -173,4 +177,35 @@
 }
 
+/** Syscall wrapper for getting mapping of a virtual page.
+ * 
+ * @retval EOK Everything went find, @p uspace_frame and @p uspace_node
+ *             contains correct values.
+ * @retval ENOENT Virtual address has no mapping.
+ */
+sysarg_t sys_page_find_mapping(uintptr_t virt_address,
+    uintptr_t *uspace_frame)
+{
+	mutex_lock(&AS->lock);
+	
+	pte_t *pte = page_mapping_find(AS, virt_address);
+	if (!PTE_VALID(pte) || !PTE_PRESENT(pte)) {
+		mutex_unlock(&AS->lock);
+		
+		return (sysarg_t) ENOENT;
+	}
+	
+	uintptr_t phys_address = PTE_GET_FRAME(pte);
+	
+	mutex_unlock(&AS->lock);
+	
+	int rc = copy_to_uspace(uspace_frame,
+	    &phys_address, sizeof(phys_address));
+	if (rc != EOK) {
+		return (sysarg_t) rc;
+	}
+	
+	return EOK;
+}
+
 /** @}
  */
Index: kernel/generic/src/proc/thread.c
===================================================================
--- kernel/generic/src/proc/thread.c	(revision 0d8a304c1941d4b637abf937d8947384c88d0e1c)
+++ kernel/generic/src/proc/thread.c	(revision 04c418dcaeffd13ea8028c1076db5abe46f4c748)
@@ -918,4 +918,10 @@
 }
 
+sysarg_t sys_thread_udelay(uint32_t usec)
+{
+	asm_delay_loop(usec * CPU->delay_loop_const);
+	return 0;
+}
+
 /** @}
  */
Index: kernel/generic/src/syscall/syscall.c
===================================================================
--- kernel/generic/src/syscall/syscall.c	(revision 0d8a304c1941d4b637abf937d8947384c88d0e1c)
+++ kernel/generic/src/syscall/syscall.c	(revision 04c418dcaeffd13ea8028c1076db5abe46f4c748)
@@ -41,4 +41,5 @@
 #include <proc/program.h>
 #include <mm/as.h>
+#include <mm/page.h>
 #include <print.h>
 #include <arch.h>
@@ -126,4 +127,5 @@
 	(syshandler_t) sys_thread_get_id,
 	(syshandler_t) sys_thread_usleep,
+	(syshandler_t) sys_thread_udelay,
 	
 	(syshandler_t) sys_task_get_id,
@@ -144,4 +146,7 @@
 	(syshandler_t) sys_as_area_destroy,
 	(syshandler_t) sys_as_get_unmapped_area,
+	
+	/* Page mapping related syscalls. */
+	(syshandler_t) sys_page_find_mapping,
 	
 	/* IPC related syscalls. */