no time scheduler

1 files changed, 45 insertions, 0 deletions

diff --git a/kernel/task/include/task/task.h b/kernel/task/include/task/task.h
new file mode 100644
index 0000000..40f18a0
--- /dev/null
+++ b/kernel/task/include/task/task.h
@@ -0,0 +1,45 @@
+#ifndef TASK_H
+#define TASK_H
+
+#include "collection/list.h"
+
+/**
+ * Task control block, contains runtime
+ * information about tasks.
+ */
+struct tcb_t {
+  /** Stack pointer of this task. (must be first in structure) */
+  char* volatile sp;
+
+  /** Lowest address of this task's memory (inclusive). */
+  char* mem_low;
+
+  /** Highest address of this task's memory (inclusive). */
+  char* mem_high;
+
+  /** Entry function of this task. */
+  void (*entry)(char);
+
+  /** Current wait queue that this task is in.*/
+  struct list_head queue;
+
+  char id;
+
+};
+
+/**
+ * Utility for declaring a task with statically allocated memory.
+ * Note: for a task to be scheduled, it must first be spawned (see spawn()).
+*/
+#define DECLARE_TASK(name, stack_size, entry_function, pid) \
+  static char _declared_stack_##name[stack_size]; \
+  static struct tcb_t name = { \
+    .sp = 0, \
+    .mem_low = _declared_stack_##name, \
+    .mem_high = _declared_stack_##name + stack_size - 1, \
+    .entry = entry_function, \
+    .queue = {}, \
+    .id = pid \
+  };
+
+#endif
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