#include "mm.h"
#include "boot/k_early_panic.h"

#define MM_MAX_MMAP_ENTRIES 64

extern "C" {

pagedirectory_t page_directory __attribute__ ((aligned (4096)));

static mm_mem_range_t mm_mmap_entries[MM_MAX_MMAP_ENTRIES];
static int mm_mmap_num_entries = 0;

/**************************************************************************
 * This function is run in segmented memory before paging is in effect.   *
 *************************************************************************/
void mm_record_mmap_entry(mb_mmap_t * mmap)
{
    if (mm_mmap_num_entries < MM_MAX_MMAP_ENTRIES)
    {
        if (mmap->type == MB_MMAP_TYPE_RAM)
        {
            mm_mmap_entries[mm_mmap_num_entries].base   = mmap->base;
            mm_mmap_entries[mm_mmap_num_entries].length = mmap->length;
            mm_mmap_num_entries++;
        }
    }
    else
    {
        k_early_panic("Too many mmap_entries!");
    }
}

/**************************************************************************
 * This function is run in segmented memory before paging is in effect.   *
 * It is run after the bootloader information has been read, so we can    *
 * overwrite that memory now.                                             *
 *************************************************************************/
void mm_bootstrap()
{
    if (mm_mmap_num_entries < 1)
    {
        k_early_panic("No mmap entries read from bootloader!");
    }

    for (int mmap_idx = 0; mmap_idx < mm_mmap_num_entries; mmap_idx++)
    {
    }

    /* Clear the page directory */
    for (unsigned int i = 0;
         i < sizeof(page_directory) / sizeof(page_directory[0]);
         i++)
    {
        page_directory[i] = 0;
    }
}

} /* extern "C" */