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24
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1 #include "kernel.h"
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2
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3 void panic(char *msg)
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4 {
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5 printf("Kernel panic: ");
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6 printf(msg);
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7 magicBochsBreak();
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8 halt();
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9 }
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10
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26
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11 void reboot()
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12 {
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13 while ( (inb(0x64) & 0x02) == 0x02)
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14 {
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15 ;
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16 }
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17 outb(0x64, 0xFE);
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18 }
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19
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24
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20 // IO port helpers:
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21 void outb(uint16_t port, uint8_t value)
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22 {
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23 asm volatile ("outb %1, %0" : : "dN" (port), "a" (value));
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24 }
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25
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26 uint8_t inb(uint16_t port)
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27 {
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28 uint8_t ret;
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29 asm volatile ("inb %1, %0" : "=a" (ret) : "dN" (port));
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30 return ret;
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31 }
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32
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33 uint16_t inw(uint16_t port)
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34 {
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35 uint16_t ret;
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36 asm volatile ("inw %1, %0" : "=a" (ret) : "dN" (port));
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37 return ret;
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38 }
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39
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40 // string functions:
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41 int strncmp(const char* s1, const char* s2, int size)
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42 {
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43 int i;
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44 for (i=0; i<size; i++)
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45 {
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46 if (s1[i] != s2[i]) return 0;
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47 }
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48 return 1;
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49 }
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50
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