kernel: Add initial scheduler implementation

Signed-off-by: Ian Moffett <ian@osmora.org>

3 files changed, 8 insertions, 4 deletions

diff --git a/sys/include/sys/proc.h b/sys/include/sys/proc.h
index 5106bf3..f45e4c6 100644
--- a/sys/include/sys/proc.h
+++ b/sys/include/sys/proc.h
@@ -33,6 +33,7 @@
 #include <sys/types.h>
 #include <sys/queue.h>
 #include <machine/cpu.h>
+#include <machine/frame.h>
 
 /*
  * A task running on the CPU e.g., a process or
@@ -41,6 +42,7 @@
 struct proc {
     pid_t pid;
     struct cpu_info *cpu;
+    struct trapframe *tf;
     TAILQ_ENTRY(proc) link;
 };
 
diff --git a/sys/include/sys/sched.h b/sys/include/sys/sched.h
index 4fdf065..d803df0 100644
--- a/sys/include/sys/sched.h
+++ b/sys/include/sys/sched.h
@@ -35,6 +35,10 @@
 #include <sys/types.h>
 #include <sys/spinlock.h>
 #include <machine/cpu.h>
+#include <machine/frame.h>
+
+void sched_init(void);
+void sched_context_switch(struct trapframe *tf);
 
 __noreturn
 void sched_init_processor(struct cpu_info *ci);
diff --git a/sys/include/sys/sched_state.h b/sys/include/sys/sched_state.h
index 03a55dd..52d6c56 100644
--- a/sys/include/sys/sched_state.h
+++ b/sys/include/sys/sched_state.h
@@ -30,15 +30,13 @@
 #ifndef _SYS_SCHED_STATE_H_
 #define _SYS_SCHED_STATE_H_
 
-#include <sys/types.h>
-#include <sys/queue.h>
+#include <sys/proc.h>
 
 /*
  * Scheduler state, per CPU.
  */
 struct sched_state {
-    TAILQ_HEAD(, proc) queue;
-    size_t queue_nrun;          /* Number of processes in the run queue */
+    struct proc *td;            /* Current_thread */
 };
 
 #endif /* !_SYS_SCHED_STATE_H_ */