From e4130630e189f44c1371dc8c78b66b8bcf6df732 Mon Sep 17 00:00:00 2001
From: "iap10@labyrinth.cl.cam.ac.uk" <iap10@labyrinth.cl.cam.ac.uk>
Date: Mon, 6 Oct 2003 17:18:26 +0000
Subject: bitkeeper revision 1.483 (3f81a3e2iM-0WXaGxUS3ywM3_KZqLw)

move mini-os to extras directory
---
 extras/mini-os/hypervisor.c | 83 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 extras/mini-os/hypervisor.c

(limited to 'extras/mini-os/hypervisor.c')

diff --git a/extras/mini-os/hypervisor.c b/extras/mini-os/hypervisor.c
new file mode 100644
index 0000000000..cf3349426e
--- /dev/null
+++ b/extras/mini-os/hypervisor.c
@@ -0,0 +1,83 @@
+/******************************************************************************
+ * hypervisor.c
+ * 
+ * Communication to/from hypervisor.
+ *
+ * Copied from XenoLinux and adjusted by Rolf.Neugebauer@intel.com
+ * 
+ * Copyright (c) 2002, K A Fraser
+ */
+
+#include <os.h>
+#include <hypervisor.h>
+
+static unsigned long event_mask = 0;
+static unsigned long ev_err_count;
+
+void do_hypervisor_callback(struct pt_regs *regs)
+{
+    unsigned long events, flags;
+    shared_info_t *shared = HYPERVISOR_shared_info;
+
+    do {
+        /* Specialised local_irq_save(). */
+        flags = test_and_clear_bit(EVENTS_MASTER_ENABLE_BIT, 
+                                   &shared->events_mask);
+        barrier();
+
+        events  = xchg(&shared->events, 0);
+        events &= event_mask;
+
+        /* 'events' now contains some pending events to handle. */
+        __asm__ __volatile__ (
+            "   push %1                            ;"
+            "   sub  $4,%%esp                      ;"
+            "   jmp  2f                            ;"
+            "1: btrl %%eax,%0                      ;" /* clear bit     */
+            "   mov  %%eax,(%%esp)                 ;"
+            "   call do_event                      ;" /* do_event(event) */
+            "2: bsfl %0,%%eax                      ;" /* %eax == bit # */
+            "   jnz  1b                            ;"
+            "   add  $8,%%esp                      ;"
+            /* we use %ebx because it is callee-saved */
+            : : "b" (events), "r" (regs)
+            /* clobbered by callback function calls */
+            : "eax", "ecx", "edx", "memory" ); 
+
+        /* Specialised local_irq_restore(). */
+        if ( flags ) set_bit(EVENTS_MASTER_ENABLE_BIT, &shared->events_mask);
+        barrier();
+    }
+    while ( shared->events );
+}
+
+
+
+/*
+ * Define interface to generic handling in irq.c
+ */
+
+void enable_hypervisor_event(unsigned int ev)
+{
+    set_bit(ev, &event_mask);
+    set_bit(ev, &HYPERVISOR_shared_info->events_mask);
+    if ( test_bit(EVENTS_MASTER_ENABLE_BIT, 
+                  &HYPERVISOR_shared_info->events_mask) )
+        do_hypervisor_callback(NULL);
+}
+
+void disable_hypervisor_event(unsigned int ev)
+{
+    clear_bit(ev, &event_mask);
+    clear_bit(ev, &HYPERVISOR_shared_info->events_mask);
+}
+
+void ack_hypervisor_event(unsigned int ev)
+{
+    if ( !(event_mask & (1<<ev)) )
+    {
+        //printk("Unexpected hypervisor event %d\n", ev);
+        atomic_inc((atomic_t *)&ev_err_count);
+    }
+    set_bit(ev, &HYPERVISOR_shared_info->events_mask);
+}
-- 
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