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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@90
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7 #include "fs.h"
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nuclear@51
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8
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nuclear@51
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9 static int (*sys_func[NUM_SYSCALLS])();
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nuclear@51
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10
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nuclear@52
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11 static void syscall(int inum);
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nuclear@51
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12
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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
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nuclear@51
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15 void init_syscall(void)
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nuclear@51
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16 {
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nuclear@51
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17 sys_func[SYS_HELLO] = sys_hello;
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nuclear@72
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18 sys_func[SYS_SLEEP] = sys_sleep; /* timer.c */
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nuclear@72
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19 sys_func[SYS_FORK] = sys_fork; /* proc.c */
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nuclear@72
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20 sys_func[SYS_EXIT] = sys_exit; /* proc.c */
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nuclear@72
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21 sys_func[SYS_WAITPID] = sys_waitpid; /* proc.c */
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nuclear@72
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22 sys_func[SYS_GETPID] = sys_getpid; /* proc.c */
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nuclear@72
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23 sys_func[SYS_GETPPID] = sys_getppid; /* proc.c */
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nuclear@51
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24
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nuclear@90
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25 sys_func[SYS_MOUNT] = sys_mount; /* fs.c */
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nuclear@90
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26 sys_func[SYS_UMOUNT] = sys_umount; /* fs.c */
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nuclear@90
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27 sys_func[SYS_OPEN] = sys_open; /* fs.c */
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nuclear@90
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28 sys_func[SYS_CLOSE] = sys_close; /* fs.c */
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nuclear@90
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29 sys_func[SYS_READ] = sys_read; /* fs.c */
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nuclear@90
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30 sys_func[SYS_WRITE] = sys_write; /* fs.c */
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nuclear@90
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31 sys_func[SYS_LSEEK] = sys_lseek; /* fs.c */
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nuclear@90
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32
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nuclear@51
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33 interrupt(SYSCALL_INT, syscall);
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nuclear@51
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34 }
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nuclear@51
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35
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nuclear@52
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36 static void syscall(int inum)
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nuclear@51
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37 {
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nuclear@52
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38 struct intr_frame *frm;
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nuclear@52
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39 int idx;
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nuclear@52
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40
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nuclear@52
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41 frm = get_intr_frame();
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nuclear@52
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42 idx = frm->regs.eax;
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nuclear@51
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43
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nuclear@51
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44 if(idx < 0 || idx >= NUM_SYSCALLS) {
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nuclear@51
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45 printf("invalid syscall: %d\n", idx);
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nuclear@51
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46 return;
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nuclear@51
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47 }
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nuclear@51
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48
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nuclear@54
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49 /* the return value goes into the interrupt frame copy of the user's eax
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nuclear@54
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50 * so that it'll be restored into eax before returning to userland.
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nuclear@54
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51 */
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nuclear@51
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52 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@72
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53
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nuclear@72
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54 /* we don't necessarily want to return to the same process
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nuclear@72
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55 * might have blocked or exited or whatever, so call schedule
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nuclear@72
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56 * to decide what's going to run next.
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nuclear@72
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57 */
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nuclear@72
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58 schedule();
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nuclear@51
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59 }
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nuclear@51
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60
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nuclear@51
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61 static int sys_hello(void)
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nuclear@51
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62 {
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nuclear@54
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63 printf("process %d says hello!\n", get_current_pid());
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nuclear@51
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64 return 0;
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nuclear@51
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65 }
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