added yield functionality

[palacios.git] / palacios / src / palacios / vmm.c

diff --git a/palacios/src/palacios/vmm.c b/palacios/src/palacios/vmm.c
index a20399b..82073f0 100644 (file)
--- a/palacios/src/palacios/vmm.c
+++ b/palacios/src/palacios/vmm.c
@@ -28,8 +28,8 @@
 #include <palacios/vmm_lowlevel.h>
 
 
-/* These should be the only global variables in Palacios */
-/* They are architecture specific variables */
+
+
 v3_cpu_arch_t v3_cpu_type;
 struct v3_os_hooks * os_hooks = NULL;
 
@@ -101,3 +101,31 @@ v3_cpu_mode_t v3_get_host_cpu_mode() {
 
 #endif 
 
+
+#define V3_Yield(addr)                                 \
+    do {                                               \
+       extern struct v3_os_hooks * os_hooks;           \
+       if ((os_hooks) && (os_hooks)->yield_cpu) {      \
+           (os_hooks)->yield_cpu();                    \
+       }                                               \
+    } while (0)                                                \
+
+
+void v3_yield_cond(struct guest_info * info) {
+    uint64_t cur_cycle;
+    rdtscll(cur_cycle);
+
+    if (cur_cycle > (info->yield_start_cycle + info->yield_cycle_period)) {
+
+       PrintDebug("Conditional Yield (cur_cyle=%p, start_cycle=%p, period=%p)\n", 
+                  (void *)cur_cycle, (void *)info->yield_start_cycle, (void *)info->yield_cycle_period);
+
+       V3_Yield();
+       rdtscll(info->yield_start_cycle);
+    }
+}
+
+void v3_yield(struct guest_info * info) {
+    V3_Yield();
+    rdtscll(info->yield_start_cycle);
+}