kern/amd64: proc: Add initial context switch logic

This commit introduces new functions that will be useful for
having multiple processes run on the system.

- Add md_proc_yield()
- Add md_proc_kick()
- Add md_sched_switch()

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

1 files changed, 8 insertions, 0 deletions

diff --git a/src/sys/include/os/sched.h b/src/sys/include/os/sched.h
index b393395..1850366 100644
--- a/src/sys/include/os/sched.h
+++ b/src/sys/include/os/sched.h
@@ -35,6 +35,7 @@
 #include <sys/proc.h>
 #include <os/spinlock.h>
 
+#define SCHED_QUANTUM 10000
 #define SCHED_NQUEUES 4
 
 /*
@@ -50,6 +51,13 @@ struct sched_queue {
 };
 
 /*
+ * Context switch to another process
+ *
+ * @tf: Current CPU context frame
+ */
+void md_sched_switch(struct trapframe *tf);
+
+/*
  * Enqueue a new process to a queue
  *
  * @q: Queue to target