kern/amd64: Introduce kernel threads

Introduces kernel threads. by using the proc_ktd() function, one can
spawn a CPL 0 running thread to the desired code.

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

1 files changed, 12 insertions, 0 deletions

diff --git a/src/sys/include/sys/proc.h b/src/sys/include/sys/proc.h
index 618ddf3..f23c0b0 100644
--- a/src/sys/include/sys/proc.h
+++ b/src/sys/include/sys/proc.h
@@ -101,6 +101,10 @@ struct proc {
 
 #define PROC_EXITING BIT(0)     /* Process is exiting */
 #define PROC_SLEEPING BIT(1)    /* Process is sleeping */
+#define PROC_KTD BIT(2)         /* Process is kernel thread */
+
+/* Flags for PROC_SPAWN */
+#define SPAWN_KTD BIT(0)        /* Spawn kernel thread */
 
 /*
  * Initialize a process into a basic minimal
@@ -136,6 +140,14 @@ struct proc *proc_self(void);
 int proc_add_range(struct proc *procp, vaddr_t va, paddr_t pa, size_t len);
 
 /*
+ * Spawn a kernel thread
+ *
+ * @procp_res: Result is written here
+ * @fn: Function where kernel thread should end up
+ */
+int proc_ktd(struct proc **procp_res, void(*fn)(void *));
+
+/*
  * Kill a process with a specific status code
  *
  * @procp: Process to kill