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nuclear@51
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1 #include <stdio.h>
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nuclear@51
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2 #include "syscall.h"
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nuclear@51
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3 #include "intr.h"
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nuclear@51
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4 #include "proc.h"
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nuclear@51
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5 #include "sched.h"
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nuclear@51
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6 #include "timer.h"
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nuclear@51
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7
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nuclear@51
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8 static int (*sys_func[NUM_SYSCALLS])();
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nuclear@51
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9
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nuclear@52
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10 static void syscall(int inum);
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nuclear@51
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11
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nuclear@51
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12 static int sys_exit(int status);
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nuclear@51
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13 static int sys_hello(void);
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nuclear@51
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14 static int sys_sleep(int sec);
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nuclear@57
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15 static int sys_fork(void);
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nuclear@57
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16 static int sys_getpid(void);
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nuclear@51
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17
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nuclear@51
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18 void init_syscall(void)
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nuclear@51
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19 {
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nuclear@51
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20 sys_func[SYS_EXIT] = sys_exit;
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nuclear@51
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21 sys_func[SYS_HELLO] = sys_hello;
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nuclear@51
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22 sys_func[SYS_SLEEP] = sys_sleep;
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nuclear@57
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23 sys_func[SYS_FORK] = sys_fork;
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nuclear@57
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24 sys_func[SYS_GETPID] = sys_getpid;
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nuclear@51
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25
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nuclear@51
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26 interrupt(SYSCALL_INT, syscall);
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nuclear@51
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27 }
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nuclear@51
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28
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nuclear@52
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29 static void syscall(int inum)
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nuclear@51
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30 {
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nuclear@52
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31 struct intr_frame *frm;
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nuclear@52
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32 int idx;
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nuclear@52
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33
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nuclear@52
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34 frm = get_intr_frame();
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nuclear@52
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35 idx = frm->regs.eax;
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nuclear@51
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36
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nuclear@51
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37 if(idx < 0 || idx >= NUM_SYSCALLS) {
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nuclear@51
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38 printf("invalid syscall: %d\n", idx);
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nuclear@51
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39 return;
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nuclear@51
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40 }
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nuclear@51
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41
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nuclear@54
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42 /* the return value goes into the interrupt frame copy of the user's eax
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nuclear@54
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43 * so that it'll be restored into eax before returning to userland.
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nuclear@54
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44 */
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nuclear@51
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45 frm->regs.eax = sys_func[idx](frm->regs.ebx, frm->regs.ecx, frm->regs.edx, frm->regs.esi, frm->regs.edi);
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nuclear@51
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46 }
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nuclear@51
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47
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nuclear@51
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48 static int sys_exit(int status)
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nuclear@51
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49 {
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nuclear@54
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50 printf("SYSCALL: exit\n");
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nuclear@51
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51 return -1; /* not implemented yet */
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nuclear@51
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52 }
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nuclear@51
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53
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nuclear@51
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54 static int sys_hello(void)
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nuclear@51
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55 {
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nuclear@54
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56 printf("process %d says hello!\n", get_current_pid());
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nuclear@51
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57 return 0;
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nuclear@51
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58 }
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nuclear@51
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59
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nuclear@51
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60 static int sys_sleep(int sec)
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nuclear@51
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61 {
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nuclear@56
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62 printf("process %d will sleep for %d seconds\n", get_current_pid(), sec);
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nuclear@57
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63 sleep(sec * 1000); /* timer.c */
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nuclear@56
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64 return 0;
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nuclear@51
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65 }
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nuclear@57
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66
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nuclear@57
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67 static int sys_fork(void)
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nuclear@57
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68 {
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nuclear@57
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69 printf("process %d is forking\n", get_current_pid());
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nuclear@57
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70 return fork(); /* proc.c */
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nuclear@57
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71 }
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nuclear@57
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72
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nuclear@57
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73 static int sys_getpid(void)
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nuclear@57
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74 {
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nuclear@57
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75 int pid = get_current_pid();
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nuclear@57
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76 printf("process %d getpid\n", pid);
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nuclear@57
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77 return pid;
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nuclear@57
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78 }
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