/*
* Initialise allocator, placing addresses [@min,@max] in free pool.
* @min and @max are PHYSICAL addresses.
*/
static void init_page_allocator(unsigned long min, unsigned long max)
{
int i;
unsigned long range, bitmap_size;
chunk_head_t *ch;
chunk_tail_t *ct;
for ( i = 0; i < FREELIST_SIZE; i++ )
{
free_head[i] = &free_tail[i];
free_tail[i].pprev = &free_head[i];
free_tail[i].next = NULL;
}
min = round_pgup (min);
max = round_pgdown(max);
/* Allocate space for the allocation bitmap. */
bitmap_size = (max+1) >> (PAGE_SHIFT+3);
bitmap_size = round_pgup(bitmap_size);
alloc_bitmap = (unsigned long *)to_virt(min);
min += bitmap_size;
range = max - min;
/* All allocated by default. */
memset(alloc_bitmap, ~0, bitmap_size);
/* Free up the memory we've been given to play with. */
map_free(PHYS_PFN(min), range>>PAGE_SHIFT);
/* The buddy lists are addressed in high memory. */
min = (unsigned long) to_virt(min);
max = (unsigned long) to_virt(max);
while ( range != 0 )
{
/*
* Next chunk is limited by alignment of min, but also
* must not be bigger than remaining range.
*/
for ( i = PAGE_SHIFT; (1UL<<(i+1)) <= range; i++ )
if ( min & (1UL<<i) ) break;
ch = (chunk_head_t *)min;
min += (1UL<<i);
range -= (1UL<<i);
ct = (chunk_tail_t *)min-1;
i -= PAGE_SHIFT;
ch->level = i;
ch->next = free_head[i];
ch->pprev = &free_head[i];
ch->next->pprev = &ch->next;
free_head[i] = ch;
ct->level = i;
}
}
void init_mm(void)
{
unsigned long start_pfn, max_pfn;
printk("MM: Init\n");
arch_init_mm(&start_pfn, &max_pfn);
/*
* now we can initialise the page allocator
*/
printk("MM: Initialise page allocator for %lx(%lx)-%lx(%lx)\n",
(unsigned long)to_virt(PFN_PHYS(start_pfn)), PFN_PHYS(start_pfn),
(unsigned long)to_virt(PFN_PHYS(max_pfn)), PFN_PHYS(max_pfn));
init_page_allocator(PFN_PHYS(start_pfn), PFN_PHYS(max_pfn));
printk("MM: done\n");
arch_init_p2m(max_pfn);
arch_init_demand_mapping_area(max_pfn);
}
static void init_page_allocator(unsigned long min, unsigned long max)
{
mm.min_phys = round_pgup(min);
mm.max_phys = round_pgdown(max);
mm.bitmap_size = (mm.max_phys + 1) >> (PAGE_SHIFT + 3);
mm.bitmap_size = round_pgup(mm.bitmap_size);
mm.bitmap = (uint64_t *)to_virt(mm.min_phys);
mm.min_phys += mm.bitmap_size;
memset(mm.bitmap, ~0, mm.bitmap_size);
mm.num_pages = (mm.max_phys - mm.min_phys) >> PAGE_SHIFT;
bitmap_free(PHYS_PFN(mm.min_phys), mm.num_pages);
printk("go_mm: page allocator manages %lu free pages\n", mm.num_pages);
}
