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283
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1 module syscall;
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2
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292
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3 /*
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4 This module handles all the system calls from user space.
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5 */
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6
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7 enum {
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8 SendMsg = 1,
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9 ReceiveMsg = 2,
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10
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11 } syscall_t;
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283
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12
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13 // System call handlers. System calls are made from user space.
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292
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14 func void handle_system_call(int callId, int a, int b, int c, int d)
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15 {
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16 // Main entry, check what to do here
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17 switch(callId)
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18 {
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19 case SendMsg:
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20 handle_send_msg();
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21 proc = process.byId(a);
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22 if (not proc)
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23 {
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24 panic();
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25 }
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283
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26
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292
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27 proc.setMessage();
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28 scheduler.current.setState(Sleep);
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29 break;
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30 case ReceiveMsg:
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31 break;
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32 case Reboot:
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33 arch.reboot();
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34 break;
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35 default:
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36 return NO_SUCH_CALL;
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37 }
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38
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39 return OK;
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283
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40 }
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41
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292
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42 // Handle send message syscall
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43 func void handle_send_msg()
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44 {
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45 p = process.byId(msg.to_id);
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46 scheduler.attempt(p);
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47 }
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48
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49 func handle_recv_msg()
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50 {
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51 // Block until we have a message
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52 currentProc->setState(Sleep);
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53 scheduler.executeNext();
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54 }
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55
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56 func handle_reboot()
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57 {
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58 reboot();
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59 }
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60
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