annotate cos/kernel/klib.c @ 299:674789d9ff37

Added a doc
author Windel Bouwman
date Sun, 01 Dec 2013 18:37:23 +0100
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1 #include "kernel.h"
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3 /* Panic and shutdown functions */
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4 void magicBochsBreak()
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5 {
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6 asm volatile("xchg %bx, %bx");
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7 }
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9 void panic(char *msg)
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10 {
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11 printf("Kernel panic: ");
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12 printf(msg);
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13 magicBochsBreak();
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14 halt();
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15 }
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17 void reboot()
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18 {
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19 // Use the keyboard to reboot:
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20 while ( (inb(0x64) & 0x02) == 0x02)
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21 {
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22 ;
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23 }
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24 outb(0x64, 0xFE);
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25 }
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27 void halt()
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28 {
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29 asm volatile("cli"); // Disable interrupts.
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30 asm volatile("hlt"); // Halt processor
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31 }
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33 /* IO port helpers: */
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34 void outb(uint16_t port, uint8_t value)
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35 {
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36 asm volatile ("outb %1, %0" : : "dN" (port), "a" (value));
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37 }
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39 uint8_t inb(uint16_t port)
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40 {
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41 uint8_t ret;
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42 asm volatile ("inb %1, %0" : "=a" (ret) : "dN" (port));
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43 return ret;
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44 }
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45
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46 uint16_t inw(uint16_t port)
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47 {
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48 uint16_t ret;
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49 asm volatile ("inw %1, %0" : "=a" (ret) : "dN" (port));
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50 return ret;
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51 }
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53 /* string functions: */
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54 int strncmp(const char* s1, const char* s2, int size)
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55 {
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56 int i;
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57 for (i=0; i<size; i++)
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58 {
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59 if (s1[i] != s2[i]) return 0;
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60 }
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61 return 1;
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62 }
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64 void memset(void* data, uint8_t value, uint64_t size)
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65 {
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66 uint64_t i;
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67 uint8_t *data2 = (uint8_t*)data;
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68 for (i = 0; i < size; i++)
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69 {
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70 data2[i] = value;
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71 }
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72 }
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