static phys_addr_t __init_memblock memblock_find_region(phys_addr_t start, phys_addr_t end,
phys_addr_t size, phys_addr_t align)
{
phys_addr_t base, res_base;
long j;
/* In case, huge size is requested */
if (end < size)
return MEMBLOCK_ERROR;
base = memblock_align_down((end - size), align);
/* Prevent allocations returning 0 as it's also used to
* indicate an allocation failure
*/
if (start == 0)
start = PAGE_SIZE;
while (start <= base) {
j = memblock_overlaps_region(&memblock.reserved, base, size);
if (j < 0)
return base;
res_base = memblock.reserved.regions[j].base;
if (res_base < size)
break;
base = memblock_align_down(res_base - size, align);
}
return MEMBLOCK_ERROR;
}
u64 __init __memblock_alloc_base(u64 size, u64 align, u64 max_addr)
{
long i, j;
u64 base = 0;
u64 res_base;
BUG_ON(0 == size);
size = memblock_align_up(size, align);
/* On some platforms, make sure we allocate lowmem */
/* Note that MEMBLOCK_REAL_LIMIT may be MEMBLOCK_ALLOC_ANYWHERE */
if (max_addr == MEMBLOCK_ALLOC_ANYWHERE)
max_addr = MEMBLOCK_REAL_LIMIT;
for (i = memblock.memory.cnt - 1; i >= 0; i--) {
u64 memblockbase = memblock.memory.region[i].base;
u64 memblocksize = memblock.memory.region[i].size;
if (memblocksize < size)
continue;
if (max_addr == MEMBLOCK_ALLOC_ANYWHERE)
base = memblock_align_down(memblockbase + memblocksize - size, align);
else if (memblockbase < max_addr) {
base = min(memblockbase + memblocksize, max_addr);
base = memblock_align_down(base - size, align);
} else
continue;
while (base && memblockbase <= base) {
j = memblock_overlaps_region(&memblock.reserved, base, size);
if (j < 0) {
/* this area isn't reserved, take it */
if (memblock_add_region(&memblock.reserved, base, size) < 0)
return 0;
return base;
}
res_base = memblock.reserved.region[j].base;
if (res_base < size)
break;
base = memblock_align_down(res_base - size, align);
}
}
return 0;
}
static u64 __init memblock_alloc_nid_unreserved(u64 start, u64 end,
u64 size, u64 align)
{
u64 base, res_base;
long j;
base = memblock_align_down((end - size), align);
while (start <= base) {
j = memblock_overlaps_region(&memblock.reserved, base, size);
if (j < 0) {
/* this area isn't reserved, take it */
if (memblock_add_region(&memblock.reserved, base, size) < 0)
base = ~(u64)0;
return base;
}
res_base = memblock.reserved.region[j].base;
if (res_base < size)
break;
base = memblock_align_down(res_base - size, align);
}
return ~(u64)0;
}
