/*
 * sysctl.h
 *
 *  Created on: 2014-4-26
 *      Author: Tuowen
 */

// Support 8 different syscalls
// Possible improvement
// CPUOFF all the time, wakeup after syscall invoked.

#ifndef SYSCTL_H_
#define SYSCTL_H_

// Sysctl priority bit
// Lowest first
#define SYS_BIT7 (0x80)
#define SYS_BIT6 (0x40)
#define SYS_BIT5 (0x20)
#define SYS_BIT4 (0x10)
#define SYS_BIT3 (0x08)
#define SYS_BIT2 (0x04)
#define SYS_BIT1 (0x02)
#define SYS_BIT0 (0x01)

// SYSCALL invocation routine
// Used this in IRQ, also wakes up the cpu
#define SYSCALL_IRQ(X) (syscall|=X,_BIC_SR_IRQ(CPUOFF))
// Use this in anywhere other than IRQ
// Continuous invocation ?
#define SYSCALL(X) (syscall|=X)

// Call handler type
// Does't have any input
// 	Preserve the state in other global variables
//	Usage example -> rsbus_syscall()
typedef void (*syshdlr)();

// Register call handler
// Always replace old value
void sysctl_reghdlr(unsigned int bit,syshdlr rot);

// Remove old call handler
// Replace with something useless
void sysctl_rmhdlr(unsigned int bit);

// Insert it into mainloop
// enabling automatic procedure invocation
void sysroutine();

// Setting up the proc base
// Call before usage
void sysctl_init();

extern volatile unsigned char syscall;

#endif /* SYSCTL_H_ */