Added first part of extended ipc support.

- Extended ipc tests
- Need to copy from ktcb-to-ktcb instead of ktcb-to-user
- Need to check flags of both ipc parties before ipc copy type.

src/generic/space.c

@@ -162,17 +162,24 @@ struct address_space *address_space_create(struct address_space *orig)
 int check_access(unsigned long vaddr, unsigned long size, unsigned int flags, int page_in)
 {
 	int err;
+	unsigned long start, end, mapsize;
 
 	/* Do not allow ridiculously big sizes */
 	if (size >= USER_AREA_SIZE)
 		return -EINVAL;
 
+	/* Get lower and upper page boundaries */
+	start = page_align(vaddr);
+	end = page_align_up(vaddr + size);
+	mapsize = end - start;
+
 	/* Check if the address is mapped with given flags */
-	if (!check_mapping(vaddr, size, flags)) {
+	if (!check_mapping(start, mapsize, flags)) {
 		/* Is a page in requested? */
 		if (page_in) {
 			/* Ask pager if paging in is possible */
-			if((err = pager_pagein_request(vaddr, size, flags)) < 0)
+			if((err = pager_pagein_request(start, mapsize,
+						       flags)) < 0)
 				return err;
 		} else
 			return -EFAULT;

src/generic/tcb.c

@@ -182,6 +182,14 @@ int tcb_check_and_lazy_map_utcb(struct ktcb *task)
 
 	BUG_ON(!task->utcb_address);
 
+	/*
+	 * FIXME:
+	 *
+	 * A task may have the utcb mapping of a destroyed thread
+	 * at the given virtual address. This would silently be accepted
+	 * as *mapped*. We need to ensure utcbs of destroyed tasks
+	 * are cleared from all other task's page tables.
+	 */
 	if ((ret = check_access(task->utcb_address, UTCB_SIZE,
 				MAP_SVC_RW_FLAGS, 0)) < 0) {
 		/* Current task simply hasn't mapped its utcb */