// mm.c
// 09/01/03 Josh Holtrop

// 0x368000 is first available byte (this is right after the kernel @ 1mb and the initrd @ 2mb, 1440kb.


pageblock *first_pageblock = (pageblock *) 0;
dword	totalmem = 0;

void mm_init()
{
	dword	*memmap_entries = (dword *) 0x9040A;
	memmap_entry	*maps = (memmap_entry *) 0x92000;
	dword a;
	for (a=0;a<(*memmap_entries);a++)
	{
		if (maps[a].attributes == 1)		// (1) mem free to OS
		{
			if  ((maps[a].base.lowdword + maps[a].limit.lowdword) > (FREERAM_START+4096))	//goes past where we start freeram
			{
				if (first_pageblock == 0)	//no pageblock page set up yet
				{
					if (maps[a].base.lowdword < (FREERAM_START+4096))
					{
						first_pageblock = (pageblock *) FREERAM_START;
					}
				}
				else
				{
				}
			}
			totalmem += maps[a].limit.lowdword;
		}
	}
	printf("Total memory available to OS: %x", totalmem);
}