cfenollosa_os-tutorial/23-fixes/libc/mem.c
2015-08-18 10:38:09 +02:00

34 lines
1.0 KiB
C

#include "mem.h"
void memory_copy(uint8_t *source, uint8_t *dest, int nbytes) {
int i;
for (i = 0; i < nbytes; i++) {
*(dest + i) = *(source + i);
}
}
void memory_set(uint8_t *dest, uint8_t val, uint32_t len) {
uint8_t *temp = (uint8_t *)dest;
for ( ; len != 0; len--) *temp++ = val;
}
/* This should be computed at link time, but a hardcoded
* value is fine for now. Remember that our kernel starts
* at 0x1000 as defined on the Makefile */
uint32_t free_mem_addr = 0x10000;
/* Implementation is just a pointer to some free memory which
* keeps growing */
uint32_t kmalloc(size_t size, int align, uint32_t *phys_addr) {
/* Pages are aligned to 4K, or 0x1000 */
if (align == 1 && (free_mem_addr & 0xFFFFF000)) {
free_mem_addr &= 0xFFFFF000;
free_mem_addr += 0x1000;
}
/* Save also the physical address */
if (phys_addr) *phys_addr = free_mem_addr;
uint32_t ret = free_mem_addr;
free_mem_addr += size; /* Remember to increment the pointer */
return ret;
}