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73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
#include "headers/common.h"
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#include "headers/screen.h"
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#include <stdint.h>
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void memcpy(void *dest, void *src, unsigned int n)
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{
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// Typecast src and dest addresses to (char *)
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char *csrc = (char *)src;
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char *cdest = (char *)dest;
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// Copy contents of src[] to dest[]
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for (unsigned int i=0; i<n; i++)
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cdest[i] = csrc[i];
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}
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void memset(void *s, int c, unsigned int n)
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{
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unsigned char* p=s;
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while(n--)
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*p++ = (unsigned char)c;
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}
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unsigned char inb(unsigned short port) {
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/* a handy c wrapper funciton that reads a byte from the specificed port
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"=a" (result) means: put al register in variable RESULT when finished
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"d" (port) means: load EDX with port */
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unsigned char result;
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__asm__("in al, dx" : "=a" (result) : "d" (port));
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return result;
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}
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void outb(unsigned short port, unsigned char data) {
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// "a" (data) means: load EAX with data
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// "d" (port) means: load EDX with port
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__asm__("out dx, al" : : "a" (data), "d" (port));
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}
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unsigned short inw(unsigned short port) {
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unsigned short result;
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__asm__("in ax, dx" : "=a" (result) : "d" (port));
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return result;
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}
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void outw(unsigned short port, unsigned short data) {
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__asm__("out dx, ax" : : "a" (data), "d" (port));
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}
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void panic(const char *message, const char *file, uint32_t line) {
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// We encountered a massive problem and have to stop.
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asm volatile("cli"); // Disable interrupts.
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//Print stack trace
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kprintf("PANIC(%s) at %s : %d\n",message,file,line);
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//Halt
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for(;;);
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}
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void panic_assert(const char *file, uint32_t line, const char *desc) {
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// An assertion failed, and we have to panic.
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asm volatile("cli"); // Disable interrupts.
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kprintf("ASSERTION-FAILED(%s) at %s : %d\n",desc,file,line);
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// Halt by going into an infinite loop.
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for(;;);
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}
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