1 files changed, 64 insertions, 0 deletions
diff --git a/src/kernel/tasks.h b/src/kernel/tasks.h
new file mode 100644
index 0000000..604c463
--- /dev/null
+++ b/src/kernel/tasks.h
@@ -0,0 +1,64 @@
+#ifndef TASKS_H
+#define TASKS_H
+
+#include <stdint.h>
+
+#define TASK_STACK_SIZE 4096
+
+#if defined( __TINYC__ )
+#pragma pack(1)
+#endif
+
+typedef struct {
+	// pushed by us
+	uint32_t eax;
+	uint32_t ebx;
+	uint32_t ecx;
+	uint32_t edx;
+	uint32_t esi;
+	uint32_t edi;
+	uint32_t ebp;	
+	
+	// really needed?
+	//~ uint32_t gs;
+	//~ uint32_t fs;	
+	//~ uint32_t es;	
+	//~ uint32_t ds;
+	
+	// ?
+	uint32_t error;
+	
+	// pushed by the CPU
+	uint32_t eip;
+	uint32_t cs;	
+	uint32_t eflags;	
+	uint32_t esp;
+	uint32_t ss;
+} __attribute__( ( packed ) ) cpu_state_t;
+
+#if defined( __TINYC__ )
+#pragma pack()
+#endif
+
+typedef struct {
+	uint8_t stack[TASK_STACK_SIZE];
+        cpu_state_t *cpu_state;
+} task_t;
+
+typedef void (*task_func_t)( void );
+
+void task_init( task_t *task, uint16_t gdt_code_segment_selector, task_func_t *entrypoint );
+
+#define MAX_NOF_TASKS 256
+
+typedef struct {
+	int nof_tasks;
+	int current_task;
+	task_t *task[MAX_NOF_TASKS];
+} task_manager_t;
+
+void task_manager_init( task_manager_t *manager );
+void task_manager_add_task( task_manager_t *manager, task_t *task );
+cpu_state_t *task_manager_schedule_task( task_manager_t *manager, cpu_state_t *cpu_state );
+
+#endif // TASKS_H