Finished adding untested bare functionality vfs

Finished adding untested shm syscalls.
Finished adding untested l4 send/recv helpers

Everything compiles. Now going to fix lots of bugs ;-)

tasks/blkdev0/main.c

@@ -1,10 +1,59 @@
-
+/*
+ * High-level block device handling.
+ *
+ * Copyright (C) 2007, 2008 Bahadir Balban
+ */
 #include <stdio.h>
 #include <blkdev.h>
 
+/*
+ * Handles block device requests from fs0 using a combination of
+ * server-specific and posix shm semantics
+ */
+void handle_block_device_request()
+{
+	u32 mr[MR_UNUSED_TOTAL];
+	l4id_t sender;
+	int err;
+	u32 tag;
+
+	printf("%s: Listening requests.\n", __TASKNAME__);
+
+	if ((err = l4_receive(L4_ANYTHREAD)) < 0) {
+		printf("%s: %s: IPC Error: %d. Quitting...\n", __TASKNAME__,
+		       __FUNCTION__, err);
+		BUG();
+	}
+
+	/* Read conventional ipc data */
+	tag = l4_get_tag();
+	sender = l4_get_sender();
+
+	/* Read mrs not used by syslib */
+	for (int i = 0; i < MR_UNUSED_TOTAL; i++)
+		mr[i] = read_mr(i);
+
+	switch(tag) {
+	case L4_IPC_TAG_WAIT:
+		printf("%s: Synced with waiting thread.\n", __TASKNAME__);
+		break;
+	case L4_IPC_TAG_BLOCK_OPEN:
+		sys_open(sender, (void *)mr[0], (int)mr[1], (u32)mr[2]);
+		break;
+	default:
+		printf("%s: Unrecognised ipc tag (%d)"
+		       "received. Ignoring.\n", __TASKNAME__, mr[MR_TAG]);
+	}
+}
+
 int main(void)
 {
+	/* Initialise the block devices */
 	init_blkdev();
+
+	while (1) {
+		handle_block_device_request();
+	}
 	return 0;
 }