Add task control syscalls.

1 files changed, 47 insertions, 0 deletions

diff --git a/src/kernel/syscall.C b/src/kernel/syscall.C
index 9cabeebd3..b993bf222 100644
--- a/src/kernel/syscall.C
+++ b/src/kernel/syscall.C
@@ -5,6 +5,7 @@
 #include <kernel/task.H>
 #include <kernel/syscalls.H>
 #include <kernel/console.H>
+#include <kernel/pagemgr.H>
 
 extern "C"
 void kernel_execute_decrementer()
@@ -22,10 +23,16 @@ namespace Systemcalls
 {
     typedef void(*syscall)(task_t*);
     void TaskYield(task_t*);
+    void TaskStart(task_t*);
+    void TaskEnd(task_t*);
+    void TaskGettid(task_t*);
 
     syscall syscalls[] =
 	{
 	    &TaskYield,
+	    &TaskStart,
+	    &TaskEnd,
+	    &TaskGettid,
 	};
 };
 
@@ -48,6 +55,18 @@ void kernel_execute_systemcall()
     }
 }
 
+#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))
+
 namespace Systemcalls
 {
     void TaskYield(task_t* t)
@@ -56,4 +75,32 @@ namespace Systemcalls
 	s->returnRunnable();
 	s->setNextRunnable();
     }
+
+    void TaskStart(task_t* t)
+    {
+	task_t* newTask = 
+	    TaskManager::createTask((TaskManager::task_fn_t)TASK_GETARG0(t),
+				    (void*)TASK_GETARG1(t));
+	newTask->cpu = t->cpu;
+	t->cpu->scheduler->addTask(newTask);
+
+	TASK_SETRTN(t, newTask->tid);
+    }
+
+    void TaskEnd(task_t* t)
+    {
+	// Make sure task pointers are updated before we delete this task.
+	t->cpu->scheduler->setNextRunnable();
+	
+	// TODO: Deal with join.
+
+	// Clean up task memory.
+	PageManager::freePage(t->context.stack_ptr, TASK_DEFAULT_STACK_SIZE);
+	delete t;
+    }
+
+    void TaskGettid(task_t* t)
+    {
+	TASK_SETRTN(t, t->tid);
+    }
 };