Add LITMUS^RT core implementation

This patch adds the core of LITMUS^RT:

 - library functionality (heaps, rt_domain, prioritization, etc.)
 - budget enforcement logic
 - job management
 - system call backends
 - virtual devices (control page, etc.)
 - scheduler plugin API (and dummy plugin)

This code compiles, but is not yet integrated with the rest of Linux.

1 files changed, 6 insertions, 6 deletions

diff --git a/include/litmus/rt_param.h b/include/litmus/rt_param.h
index a1fed7653377..138799fbaad7 100644
--- a/include/litmus/rt_param.h
+++ b/include/litmus/rt_param.h
@@ -84,12 +84,12 @@ struct rt_task {
 };
 
 union np_flag {
-        uint64_t raw;
+        uint32_t raw;
         struct {
                 /* Is the task currently in a non-preemptive section? */
-                uint64_t flag:31;
+                uint32_t flag:31;
                 /* Should the task call into the scheduler? */
-                uint64_t preempt:1;
+                uint32_t preempt:1;
         } np;
 };
 
@@ -110,10 +110,10 @@ union np_flag {
 struct control_page {
         /* This flag is used by userspace to communicate non-preempive
          * sections. */
-        volatile union np_flag sched;
+        volatile __attribute__ ((aligned (8))) union np_flag sched;
 
-        volatile uint64_t irq_count; /* Incremented by the kernel each time an IRQ is
-                                      * handled. */
+        /* Incremented by the kernel each time an IRQ is handled. */
+        volatile __attribute__ ((aligned (8))) uint64_t irq_count;
 
         /* Locking overhead tracing: userspace records here the time stamp
          * and IRQ counter prior to starting the system call. */