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#include <paging.h>
#include <libk/list.h>
#include <libk/stdio.h>
#include <libk/serial_stdio.h>
#include <libk/string.h>
#include <multiboot2.h>
#include <pmm.h>
#define MEM_USED_BELOW 50 * 1024 * 1024
uint64_t free_mem_cnt;
uint64_t all_mem_cnt;
list_t pmm_list;
void init_pmm()
{
INIT_LIST(pmm_list);
mmap_t *pos;
list_for_each_entry_prev(pos, (&mmap.list), list) {
mb2_tag_mmap_entry entry = pos->mmap_entry;
if (entry.type != 1)
continue;
uint64_t base = entry.base_addr & (PAGE_SIZE - 1) ?
(entry.base_addr &
(uint64_t) ~(PAGE_SIZE - 1)) +
PAGE_SIZE :
entry.base_addr;
for (uint64_t i = base;
i + PAGE_SIZE <= entry.base_addr + entry.length;
i += PAGE_SIZE) {
if (i >= MEM_USED_BELOW) {
free_mem_cnt++;
map_addr(i, i, FLAG_PRESENT);
list_t *list = (list_t *)i;
add_to_list(list, &pmm_list, pmm_list.next);
}
}
}
all_mem_cnt = free_mem_cnt;
}
void memory_usage()
{
printf("memory used: %dMB\n",
(MEM_USED_BELOW + (all_mem_cnt - free_mem_cnt) * PAGE_SIZE) /
1024 / 1024);
printf("memory free: %dMB\n", free_mem_cnt * PAGE_SIZE / 1024 / 1024);
}
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