mem.c

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//src/mem/mem.c - general memory funcs
#include "../lib/types.h"
#include "mem.h"
 
/**
 * @brief fetches memory size and returns it
 *
 * when using memsize it needs to be passed the multiboot info parameter inside kmain
 * using memsize is done with:
 * @code{.c}
 * #include "../mem/mem.h" //or just mem.h
 * uint32_t memory_size = memsize(mb_info); //or your multiboot info var
 * @endcode
 *
 * @see kmain(), boot.s
*/
uint32_t __memsize(void *mb_info) {
    if (mb_info == NULL) return 0;
    
    uint32_t mem_lower = *(uint32_t*)((uint8_t*)mb_info + 4);
    uint32_t mem_upper = *(uint32_t*)((uint8_t*)mb_info + 8);
    
    return mem_lower + mem_upper;
}