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 #include "fs.h"

8

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

10

11 static void syscall(int inum);

12

13 static int sys_hello(void);

14

15 void init_syscall(void)

16 {

17 sys_func[SYS_HELLO] = sys_hello;

18 sys_func[SYS_SLEEP] = sys_sleep; /* timer.c */

19 sys_func[SYS_FORK] = sys_fork; /* proc.c */

20 sys_func[SYS_EXIT] = sys_exit; /* proc.c */

21 sys_func[SYS_WAITPID] = sys_waitpid; /* proc.c */

22 sys_func[SYS_GETPID] = sys_getpid; /* proc.c */

23 sys_func[SYS_GETPPID] = sys_getppid; /* proc.c */

24

25 sys_func[SYS_MOUNT] = sys_mount; /* fs.c */

26 sys_func[SYS_UMOUNT] = sys_umount; /* fs.c */

27 sys_func[SYS_OPEN] = sys_open; /* fs.c */

28 sys_func[SYS_CLOSE] = sys_close; /* fs.c */

29 sys_func[SYS_READ] = sys_read; /* fs.c */

30 sys_func[SYS_WRITE] = sys_write; /* fs.c */

31 sys_func[SYS_LSEEK] = sys_lseek; /* fs.c */

32

33 interrupt(SYSCALL_INT, syscall);

34 }

35

36 static void syscall(int inum)

37 {

38 struct intr_frame *frm;

39 int idx;

40

41 frm = get_intr_frame();

42 idx = frm->regs.eax;

43

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

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

46 return;

47 }

48

49 /* the return value goes into the interrupt frame copy of the user's eax

50 * so that it'll be restored into eax before returning to userland.

51 */

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

53

54 /* we don't necessarily want to return to the same process

55 * might have blocked or exited or whatever, so call schedule

56 * to decide what's going to run next.

57 */

58 schedule();

59 }

60

61 static int sys_hello(void)

62 {

63 printf("process %d says hello!\n", get_current_pid());

64 return 0;

65 }