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#ifndef SYS_SCHEDULE_H
#define SYS_SCHEDULE_H
#define TQUEUE_MAX 0x100
#define STACK_SIZE 0x4000
#define TQUEUE_CNT 5
#define PRIORITIES 6
#define MAX_THREADS TQUEUE_MAX*PRIORITIES*TQUEUE_CNT
#define STACK_DRAW_YOFF 320
#define STACK_DRAW_WIDTH 32
#define STACK_DRAW_SIZE 3
enum ThreadStatus {
THREAD_READY = 0,
THREAD_MWAIT = 1,
THREAD_SWAIT = 2,
THREAD_FINISH = 3, // Need to clean up
THREAD_SERROR = 4, // Stack Error
};
struct RStack {
void* sp;
unsigned long idx;
};
struct Thread {
void* pc;
void* sp; // Store r0-r12,lr on stack
unsigned long sp_base;
void* mptr;
unsigned long pid;
unsigned char priority;
unsigned char preempt;
unsigned short status;
unsigned long cpsr;
};
struct ThreadRotBuffer {
unsigned int roffset;
unsigned int woffset;
struct Thread* queue[TQUEUE_MAX];
};
struct ThreadQueues {
struct ThreadRotBuffer ready;
struct ThreadRotBuffer mwait;
struct ThreadRotBuffer swait;
struct ThreadRotBuffer finish;
struct ThreadRotBuffer serror;
};
struct Scheduler {
struct Thread* rthread;
struct ThreadQueues thread_queues[PRIORITIES];
};
void init_scheduler(void);
void add_thread(void* pc, void* arg, unsigned char priority);
void draw_stacks(void);
void uart_scheduler(void);
struct Thread* next_thread(void);
/// TODO: ENSURE IRQ/ FIQ entry switches
/// to user mode then calls the SVC call
extern void schedule(void);
extern void cleanup(void);
void yield(void);
#endif
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