From e9a3562d6a5cf88e6034570ab791e91e63ffb14a Mon Sep 17 00:00:00 2001
From: Patrick Williams <iawillia@us.ibm.com>
Date: Fri, 25 Jun 2010 16:27:36 -0500
Subject: Add shell of VFS for registering and resolving message queue names.

---
 src/sys/init/init_main.C |  8 +++++
 src/sys/makefile         |  4 +--
 src/sys/vfs/makefile     | 10 +++++++
 src/sys/vfs/vfs_main.C   | 78 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 97 insertions(+), 3 deletions(-)
 create mode 100644 src/sys/vfs/makefile
 create mode 100644 src/sys/vfs/vfs_main.C

(limited to 'src/sys')

diff --git a/src/sys/init/init_main.C b/src/sys/init/init_main.C
index c11b4ef97..a7bc68b55 100644
--- a/src/sys/init/init_main.C
+++ b/src/sys/init/init_main.C
@@ -14,13 +14,21 @@ void init_child(void* unused)
     task_end();
 }
 
+void vfs_main(void*);
+
 void init_main(void* unused)
 {
     printk("Starting init!\n");
+    
+    printk("Bringing up VFS...");
+    task_create(&vfs_main, NULL);
+    task_yield(); // TODO... add a barrier to ensure VFS is fully up.
 
     global_mutex = mutex_create();
 
     msg_q_t msgq = msg_q_create();
+    msg_q_register(msgq, "/msg/init");
+
     msg_t* msg = msg_allocate();
     msg->type = 1; msg->data[0] = 0xDEADBEEF12345678;
     msg_send(msgq, msg);
diff --git a/src/sys/makefile b/src/sys/makefile
index 5a553e1d2..0eb552a44 100644
--- a/src/sys/makefile
+++ b/src/sys/makefile
@@ -2,9 +2,7 @@ IMGDIR = ../../img
 OBJDIR = ../../obj
 include ../../config.mk
 
-SUBDIRS = init.d
-IMAGES += ${IMGDIR}/kernel.elf 
-IMAGES += ${IMGDIR}/kernel.bin
+SUBDIRS = init.d vfs.d
 
 all: ${SUBDIRS}
 
diff --git a/src/sys/vfs/makefile b/src/sys/vfs/makefile
new file mode 100644
index 000000000..94ca71bbf
--- /dev/null
+++ b/src/sys/vfs/makefile
@@ -0,0 +1,10 @@
+OBJDIR = ../../../obj
+include ../../../config.mk
+
+OBJS = vfs_main.o
+OBJECTS = $(addprefix ${OBJDIR}/, ${OBJS})
+
+all: ${OBJECTS}
+
+clean:
+	(rm -f ${OBJECTS} )
diff --git a/src/sys/vfs/vfs_main.C b/src/sys/vfs/vfs_main.C
new file mode 100644
index 000000000..6ba561eb2
--- /dev/null
+++ b/src/sys/vfs/vfs_main.C
@@ -0,0 +1,78 @@
+#include <string.h>
+
+#include <sys/msg.h>
+#include <sys/vfs.h>
+
+#include <util/locked/list.H>
+#include <kernel/console.H>  // TODO : Remove this.
+
+const char* VFS_ROOT = "/";
+const char* VFS_ROOT_BIN = "/bin/";
+const char* VFS_ROOT_DATA = "/data/";
+const char* VFS_ROOT_MSG = "/msg/";
+
+struct VfsPath
+{
+    char key[64];
+
+    bool operator!=(VfsPath& r) { return 0 != strcmp(key, r.key); };
+};
+
+struct VfsEntry
+{
+    typedef VfsPath key_type;
+    key_type key;
+    msg_q_t msg_q;
+    
+    VfsEntry* next;
+    VfsEntry* prev;
+};
+
+void vfs_main(void* unused)
+{
+    msg_q_t vfsMsgQ = msg_q_create();
+    msg_q_register(vfsMsgQ, VFS_ROOT);
+    
+    printk("done.\n");
+    // TODO... barrier with init.
+
+    Util::Locked::List<VfsEntry, VfsEntry::key_type> vfsContents;
+
+    while(1)
+    {
+	msg_t* msg = msg_wait(vfsMsgQ);
+
+	switch(msg->type)
+	{
+	    case VFS_MSG_REGISTER_MSGQ:
+		{
+		    VfsEntry* e = new VfsEntry();
+		    strcpy(e->key.key, (char*) msg->extra_data);
+		    e->msg_q = (msg_q_t) msg->data[0];
+		    vfsContents.insert(e);
+
+		    printk("VFS: Registering %llx as %s\n",
+			   e->msg_q, e->key.key);
+		    msg_respond(vfsMsgQ, msg);
+		}
+		break;
+
+	    case VFS_MSG_RESOLVE_MSGQ:
+		{
+		    VfsEntry::key_type k;
+		    strcpy(k.key, (char*) msg->extra_data);
+		    VfsEntry* e = vfsContents.find(k);
+		    if (NULL == e)
+			msg->data[0] = (uint64_t) NULL;
+		    else
+			msg->data[0] = (uint64_t) e->msg_q;
+		    msg_respond(vfsMsgQ, msg);		    
+		}
+		break;
+
+	    default:
+		msg_free(msg);
+		break;
+	}
+    }
+}
-- 
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