Implement Kernel->User-space message bridge.

Change-Id: Icf6fc9e10b1c39e981dddf180607b710c597112b
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/249
Tested-by: Jenkins Server
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

1 files changed, 16 insertions, 3 deletions

diff --git a/src/include/kernel/task.H b/src/include/kernel/task.H
index 6cd49028d..b72322d83 100644
--- a/src/include/kernel/task.H
+++ b/src/include/kernel/task.H
@@ -29,17 +29,17 @@ struct task_t
 {
         /** Pointer to the CPU this task is assigned to. */
     cpu_t* cpu;
-        /** Context information.  This MUST stay here due to 
+        /** Context information.  This MUST stay here due to
          *  save-restore asm code. */
     context_t context;
-        
+
         /** Task ID */
     tid_t tid;
         /** Determines if user-space would like this task pinned to a CPU.
          *  This value is considered a count of the number of times the pinned
          *  as been requested, so pinning can be used recursively. */
     uint64_t affinity_pinned;
-        
+
         // Pointers for queue containers.
     task_t* prev;
     task_t* next;
@@ -47,4 +47,17 @@ struct task_t
 
 enum { TASK_DEFAULT_STACK_SIZE = 4 };
 
+// Macros for manipulating task's saved contexts.
+#define TASK_GETARGN(t, n) (t->context.gprs[n+4])
+#define TASK_GETARG0(t) (TASK_GETARGN(t,0))
+#define TASK_GETARG1(t) (TASK_GETARGN(t,1))
+#define TASK_GETARG2(t) (TASK_GETARGN(t,2))
+#define TASK_GETARG3(t) (TASK_GETARGN(t,3))
+#define TASK_GETARG4(t) (TASK_GETARGN(t,4))
+#define TASK_GETARG5(t) (TASK_GETARGN(t,5))
+#define TASK_GETARG6(t) (TASK_GETARGN(t,6))
+#define TASK_GETARG7(t) (TASK_GETARGN(t,7))
+#define TASK_SETRTN(t, n) (t->context.gprs[3] = (n))
+
+
 #endif