bitkeeper revision 1.483 (3f81a3e2iM-0WXaGxUS3ywM3_KZqLw)

move mini-os to extras directory

1 files changed, 106 insertions, 0 deletions

diff --git a/extras/mini-os/events.c b/extras/mini-os/events.c
new file mode 100644
index 0000000000..a2083afa37
--- /dev/null
+++ b/extras/mini-os/events.c
@@ -0,0 +1,106 @@
+/* -*-  Mode:C; c-basic-offset:4; tab-width:4 -*-
+ ****************************************************************************
+ * (C) 2003 - Rolf Neugebauer - Intel Research Cambridge
+ ****************************************************************************
+ *
+ *        File: events.c
+ *      Author: Rolf Neugebauer (neugebar@dcs.gla.ac.uk)
+ *     Changes: 
+ *              
+ *        Date: Jul 2003
+ * 
+ * Environment: Xen Minimal OS
+ * Description: Deal with events
+ *
+ ****************************************************************************
+ * $Id: c-insert.c,v 1.7 2002/11/08 16:04:34 rn Exp $
+ ****************************************************************************
+ */
+
+#include <os.h>
+#include <hypervisor.h>
+#include <events.h>
+#include <lib.h>
+
+static ev_action_t ev_actions[NR_EVS];
+void default_handler(int ev, struct pt_regs *regs);
+
+
+/*
+ * demux events to different handlers
+ */
+asmlinkage unsigned int do_event(int ev, struct pt_regs *regs)
+{
+    ev_action_t  *action;
+
+    if (ev >= NR_EVS) {
+        printk("Large event number %d\n", ev);
+        return 0;
+    }
+
+    action = &ev_actions[ev];
+    action->count++;
+    ack_hypervisor_event(ev);
+
+    if (!action->handler)
+        goto out;
+    
+    if (action->status & EVS_DISABLED)
+        goto out;
+    
+    /* call the handler */
+    action->handler(ev, regs);
+    
+ out:
+    return 1;
+
+}
+
+/*
+ * add a handler
+ */
+unsigned int add_ev_action( int ev, void (*handler)(int, struct pt_regs *) )
+{
+    if (ev_actions[ev].handler) {
+        printk ("event[%d] already handled by %p", ev, ev_actions[ev].handler);
+        return 0;
+    }
+
+    ev_actions[ev].handler = handler;
+    return 1;
+}
+
+unsigned int enable_ev_action( int ev )
+{
+    if (!ev_actions[ev].handler) {
+        printk ("enable event[%d], no handler installed", ev);
+        return 0;
+    }
+    ev_actions[ev].status &= ~EVS_DISABLED;
+    return 1;
+}
+
+unsigned int disable_ev_action( int ev )
+{
+    ev_actions[ev].status |= EVS_DISABLED;
+    return 1;
+}
+
+/*
+ * initially all events are without a handler and disabled
+ */
+void init_events(void)
+{
+    int i;
+
+    /* inintialise event handler */
+    for ( i = 0; i < NR_EVS; i++ )
+    {
+        ev_actions[i].status  = EVS_DISABLED;
+        ev_actions[i].handler = NULL;
+    }
+}
+
+void default_handler(int ev, struct pt_regs *regs) {
+    printk("X[%d] ", ev);
+}