nuclear@51: #include <stdio.h>
nuclear@51: #include "syscall.h"
nuclear@51: #include "intr.h"
nuclear@51: #include "proc.h"
nuclear@51: #include "sched.h"
nuclear@51: #include "timer.h"
nuclear@51: 
nuclear@51: static int (*sys_func[NUM_SYSCALLS])();
nuclear@51: 
nuclear@52: static void syscall(int inum);
nuclear@51: 
nuclear@51: static int sys_hello(void);
nuclear@51: 
nuclear@51: void init_syscall(void)
nuclear@51: {
nuclear@51: 	sys_func[SYS_HELLO] = sys_hello;
nuclear@72: 	sys_func[SYS_SLEEP] = sys_sleep;		/* timer.c */
nuclear@72: 	sys_func[SYS_FORK] = sys_fork;			/* proc.c */
nuclear@72: 	sys_func[SYS_EXIT] = sys_exit;			/* proc.c */
nuclear@72: 	sys_func[SYS_WAITPID] = sys_waitpid;	/* proc.c */
nuclear@72: 	sys_func[SYS_GETPID] = sys_getpid;		/* proc.c */
nuclear@72: 	sys_func[SYS_GETPPID] = sys_getppid;	/* proc.c */
nuclear@51: 
nuclear@51: 	interrupt(SYSCALL_INT, syscall);
nuclear@51: }
nuclear@51: 
nuclear@52: static void syscall(int inum)
nuclear@51: {
nuclear@52: 	struct intr_frame *frm;
nuclear@52: 	int idx;
nuclear@52: 
nuclear@52: 	frm = get_intr_frame();
nuclear@52: 	idx = frm->regs.eax;
nuclear@51: 
nuclear@51: 	if(idx < 0 || idx >= NUM_SYSCALLS) {
nuclear@51: 		printf("invalid syscall: %d\n", idx);
nuclear@51: 		return;
nuclear@51: 	}
nuclear@51: 
nuclear@54: 	/* the return value goes into the interrupt frame copy of the user's eax
nuclear@54: 	 * so that it'll be restored into eax before returning to userland.
nuclear@54: 	 */
nuclear@51: 	frm->regs.eax = sys_func[idx](frm->regs.ebx, frm->regs.ecx, frm->regs.edx, frm->regs.esi, frm->regs.edi);
nuclear@72: 
nuclear@72: 	/* we don't necessarily want to return to the same process
nuclear@72: 	 * might have blocked or exited or whatever, so call schedule
nuclear@72: 	 * to decide what's going to run next.
nuclear@72: 	 */
nuclear@72: 	schedule();
nuclear@51: }
nuclear@51: 
nuclear@51: static int sys_hello(void)
nuclear@51: {
nuclear@54: 	printf("process %d says hello!\n", get_current_pid());
nuclear@51: 	return 0;
nuclear@51: }