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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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11 // IO port helpers:
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12 void outb(uint16_t port, uint8_t value)
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13 {
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14 asm volatile ("outb %1, %0" : : "dN" (port), "a" (value));
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15 }
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16
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17 uint8_t inb(uint16_t port)
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18 {
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19 uint8_t ret;
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20 asm volatile ("inb %1, %0" : "=a" (ret) : "dN" (port));
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21 return ret;
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22 }
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23
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24 uint16_t inw(uint16_t port)
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25 {
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26 uint16_t ret;
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27 asm volatile ("inw %1, %0" : "=a" (ret) : "dN" (port));
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28 return ret;
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29 }
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30
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31 // string functions:
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32 int strncmp(const char* s1, const char* s2, int size)
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33 {
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34 int i;
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35 for (i=0; i<size; i++)
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36 {
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37 if (s1[i] != s2[i]) return 0;
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38 }
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39 return 1;
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40 }
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41
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