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37
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1 #include "kernel.h"
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2
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3 /* Interactive shell, should be eventually a user space
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4 program */
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5
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6 static void testMalloc()
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7 {
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8 char *a, *b;
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9
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10 printf("Testing malloc\n");
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11 a = kmalloc(100);
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12 printf("Got a at %x\n", a);
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13 a[0] = 'A';
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14 b = kmalloc(22);
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15 printf("Got b at %x\n", b);
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16 b[0] = 'B';
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17 kfree(a);
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18 }
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19
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40
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20 void memory_status(void);
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21
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37
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22 void shell()
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23 {
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24 printf("Welcome!\n");
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25 while (1)
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26 {
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27 char buffer[70];
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28 printf(">");
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29 getline(buffer, 70);
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30 // TODO: interpret this line with python :)
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31 printf("\n");
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32 if (buffer[0] == 'x')
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33 {
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34 printf("System time in ms: %d\n", getTimeMS());
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40
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35 memory_status();
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37
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36 }
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37 if (buffer[0] == 't')
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38 {
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39 testMalloc();
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40 }
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41 if ( strncmp(buffer, "help", 4))
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42 {
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43 printf("Help\n Try one of these commands:\n");
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44 printf(" x: print system time in ms\n");
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45 printf(" r: reboot\n");
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46 printf(" t: test\n");
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47 printf(" b: break\n");
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48 }
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49
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50 if (strncmp(buffer, "r", 1))
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51 {
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52 reboot();
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53 }
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54
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55 if (strncmp(buffer, "b", 1))
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56 {
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57 magicBochsBreak();
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58 }
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59
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60 if (strncmp(buffer, "pf", 2))
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61 {
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62 /* Test general protection exception */
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63 uint64_t *x;
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64 x = (uint64_t*)0x4000000; // Address that is not mapped
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65 *x = 0x2; // trigger paging exception
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66 }
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67 }
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68 }
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69
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