Removed allocation of utcb shared pages by mm0 completely.

- Now libl4 has no references to utcb page or shmat etc.
- Pager does not deal with special case utcb page allocation.
  It instead allocates a shared page from shm memory pool.
- All tasks working to original standard.

Next:
- Add per-thread utcb allocation from the kernel
- Add larger register file for standard ipc
- Add long ipc (up to 1Kb)

tasks/libposix/init.c

@@ -1,79 +1,30 @@
 /*
- * Shared page initialisation of posix-like tasks.
+ * Main entry point for posix services and applications.
  *
- * POSIX tasks currently use a default shared page for communciation.
- * This could have been also done by long ipc calls.
+ * Copyright (C) 2007-2009 Bahadir Balban
  */
 
-/*
- * Shared page for this task. Used for passing data among ipc
- * parties when message registers are not big enough. Every thread
- * has right to own one, and it has an address unique to every
- * thread. It must be explicitly mapped by both parties of the ipc
- * in order to be useful.
- */
-void *shared_page;
+#include <shpage.h>
+#include <posix_init.h>
 
-/*
- * Obtains a unique address for the task's shared page. Note this
- * just returns the address. This address is used as an shm key
- * to map it via shmget()/shmat() later on.
- */
-static void *shared_page_address(void)
+void posix_init(void)
 {
-	void *addr;
-	int err;
-
-	/* We're asking it for ourself. */
-	write_mr(L4SYS_ARG0, self_tid());
-
-	/* Call pager with utcb address request. Check ipc error. */
-	if ((err = l4_sendrecv(PAGER_TID, PAGER_TID,
-			       L4_IPC_TAG_DEFAULT_SHPAGE)) < 0) {
-		printf("%s: L4 IPC Error: %d.\n", __FUNCTION__, err);
-		return PTR_ERR(err);
-	}
-
-	/* Check if syscall itself was successful */
-	if (IS_ERR(addr = (void *)l4_get_retval())) {
-		printf("%s: Request UTCB Address Error: %d.\n",
-		       __FUNCTION__, (int)addr);
-		return addr;
-	}
-
-	return addr;
+	/* Non-pager tasks initialise their shared communication page */
+	if (self_tid() != PAGER_TID)
+		shared_page_init();
 }
 
+int main(void);
+
 /*
- * Initialises a non-pager task's default shared memory page
- * using posix semantics. Used during task initialisation
- * and by child tasks after a fork.
+ * Entry point for posix services container.
+ *
+ * This is executed by all posix system services and tasks
+ * that run in this container.
  */
-int shared_page_init(void)
+void __container_init(void)
 {
-	int shmid;
-	void *shmaddr;
-
-	/*
-	 * Initialise shared page only if we're not the pager.
-	 * The pager does it differently for itself.
-	 */
-	BUG_ON(self_tid() == PAGER_TID);
-
-	/* Obtain our utcb page address */
-	utcb_page = l4_utcb_page();
-	//printf("%s: UTCB Read from mm0 as: 0x%x\n", __FUNCTION__,
-	//       (unsigned long)utcb_page);
-
-	/* Use it as a key to create a shared memory region */
-	BUG_ON((shmid = shmget((key_t)utcb_page,
-			       PAGE_SIZE, IPC_CREAT)) < 0);
-
-	/* Attach to the region */
-	BUG_ON((shmaddr = shmat(shmid, utcb_page, 0)) < 0);
-	BUG_ON(shmaddr != utcb_page);
-
-	return 0;
+	posix_init();
+	main();
 }
 
-