sched: implement user-configurable fs and gs segment base addresses

include/kernel/syscall.h

@@ -56,8 +56,28 @@ extern kern_status_t sys_task_create_thread(
 extern kern_status_t sys_task_get_address_space(
 	kern_handle_t task,
 	kern_handle_t *out);
+extern kern_status_t sys_task_config_get(
+	kern_handle_t task,
+	kern_config_key_t key,
+	void *ptr,
+	size_t len);
+extern kern_status_t sys_task_config_set(
+	kern_handle_t task,
+	kern_config_key_t key,
+	const void *ptr,
+	size_t len);
 
 extern kern_status_t sys_thread_start(kern_handle_t thread);
+extern kern_status_t sys_thread_config_get(
+	kern_handle_t thread,
+	kern_config_key_t key,
+	void *ptr,
+	size_t len);
+extern kern_status_t sys_thread_config_set(
+	kern_handle_t thread,
+	kern_config_key_t key,
+	const void *ptr,
+	size_t len);
 
 extern kern_status_t sys_vm_object_create(
 	const char *name,

include/kernel/thread.h

@@ -1,6 +1,7 @@
 #ifndef KERNEL_THREAD_H_
 #define KERNEL_THREAD_H_
 
+#include <kernel/machine/thread.h>
 #include <kernel/msg.h>
 #include <kernel/object.h>
 #include <kernel/vm-controller.h>
@@ -22,7 +23,7 @@ enum thread_flags {
 };
 
 struct thread {
-	struct object thr_base;
+	struct object tr_base;
 
 	enum thread_state tr_state;
 	enum thread_flags tr_flags;
@@ -38,6 +39,7 @@ struct thread {
 	virt_addr_t tr_ip, tr_sp, tr_bp;
 	virt_addr_t tr_cpu_user_sp, tr_cpu_kernel_sp;
 
+	struct ml_thread tr_ml;
 	struct runqueue *tr_rq;
 
 	struct queue_entry tr_parent_entry;
@@ -61,4 +63,17 @@ extern void idle(void);
 extern struct thread *create_kernel_thread(void (*fn)(void));
 extern struct thread *create_idle_thread(void);
 
+extern kern_status_t thread_config_get(
+	struct thread *thread,
+	kern_config_key_t key,
+	void *out,
+	size_t max);
+extern kern_status_t thread_config_set(
+	struct thread *thread,
+	kern_config_key_t key,
+	const void *ptr,
+	size_t len);
+
+DEFINE_OBJECT_LOCK_FUNCTION(thread, tr_base)
+
 #endif