/*
* set up the free-area data structures:
* - mark all pages reserved
* - mark all memory queues empty
* - clear the memory bitmaps
*/
static unsigned long init_free_area(unsigned long start_mem, unsigned long end_mem)
{
page_struct_t *p;
unsigned long mask = PAGE_MASK;
unsigned long i;
unsigned long start_addrspace = KADDRSPACE_START;
int size;
/*
* Select nr of pages we try to keep free for important stuff
* with a minimum of 10 pages and a maximum of 256 pages, so
* that we don't waste too much memory on large systems.
* This is fairly arbitrary, but based on some behaviour
* analysis.
*/
INIT_LOG(" init_free_area start_mem: %x endmem:%x \n",start_mem,end_mem);
i = (end_mem - start_addrspace) >> (PAGE_SHIFT+7);
if (i < 10)
i = 10;
if (i > 256)
i = 256;
/*TODO freepages.min = i;
freepages.low = i * 2;
freepages.high = i * 3;*/
g_mem_map = (page_struct_t *) LONG_ALIGN(start_mem+8);
INIT_LOG(" g_mem_map :%x size:%x \n",g_mem_map,MAP_NR(end_mem));
p = g_mem_map + MAP_NR(end_mem);
start_mem = LONG_ALIGN((unsigned long) p);
size=(start_mem -(unsigned long) g_mem_map);
INIT_LOG(" freearemap setup map: %x diff:%x(%dM) \n",g_mem_map,(start_mem -(unsigned long) g_mem_map),size/(1024*1024));
//while(1);
ut_memset((unsigned char *)g_mem_map, 0, start_mem -(unsigned long) g_mem_map);
do {
--p;
atomic_set(&p->count, 0);
p->flags = (1 << PG_DMA) | (1 << PG_reserved) ;
} while (p > g_mem_map);
for (i = 0 ; i < NR_MEM_LISTS ; i++) {
unsigned long bitmap_size;
init_mem_queue(free_mem_area+i);
mask += mask;
end_mem = (end_mem + ~mask) & mask;
bitmap_size = (end_mem - start_addrspace) >> (PAGE_SHIFT + i);
bitmap_size = (bitmap_size + 7) >> 3;
bitmap_size = LONG_ALIGN(bitmap_size);
free_mem_area[i].map = (unsigned int *) start_mem;
ut_memset((void *) start_mem, 0, bitmap_size);
start_mem += bitmap_size;
INIT_LOG(" %d : bitmapsize:%x end_mem:%x \n",i,bitmap_size,end_mem);
}
return start_mem;
}
char* kmem_t::init() {
int start_mem = PGALIGN((int)end);
pages = (page_t*)LONG_ALIGN(start_mem);
int maxpfn = (PHYSTOP) >> PGSHIFT;
epages = pages + maxpfn;
return (char*)(epages);
}
