1 #include <stdio.h>

2 #include "syscall.h"

3 #include "intr.h"

4 #include "proc.h"

5 #include "sched.h"

6 #include "timer.h"

7

8 static int (*sys_func[NUM_SYSCALLS])();

9

10 static void syscall(int inum);

11

12 static int sys_exit(int status);

13 static int sys_hello(void);

14 static int sys_sleep(int sec);

15

16 void init_syscall(void)

17 {

18 sys_func[SYS_EXIT] = sys_exit;

19 sys_func[SYS_HELLO] = sys_hello;

20 sys_func[SYS_SLEEP] = sys_sleep;

21

22 interrupt(SYSCALL_INT, syscall);

23 }

24

25 static void syscall(int inum)

26 {

27 struct intr_frame *frm;

28 int idx;

29

30 frm = get_intr_frame();

31 idx = frm->regs.eax;

32

33 if(idx < 0 || idx >= NUM_SYSCALLS) {

34 printf("invalid syscall: %d\n", idx);

35 return;

36 }

37

38 frm->regs.eax = sys_func[idx](frm->regs.ebx, frm->regs.ecx, frm->regs.edx, frm->regs.esi, frm->regs.edi);

39 schedule();

40 }

41

42 static int sys_exit(int status)

43 {

44 return -1; /* not implemented yet */

45 }

46

47 static int sys_hello(void)

48 {

49 /*printf("process %d says hello!\n", get_current_pid());*/

50 return 0;

51 }

52

53 static int sys_sleep(int sec)

54 {

55 int pid = get_current_pid();

56 /*printf("process %d will sleep for %d sec\n", pid, sec);*/

57 start_timer(sec * 1000, (timer_func_t)unblock_proc, (void*)pid);

58 block_proc(pid);

59 return 0;

60 }