HEAP_MIN
if (bios_extmem >= HEAP_MIN && high_heap_size < HEAP_MIN) {
high_heap_size = HEAP_MIN;
high_heap_base = bios_extmem + 0x100000 - HEAP_MIN;
if (high_heap_base < smap.base && size >= HEAP_MIN) {
high_heap_base = smap.base + size - HEAP_MIN;
high_heap_size = HEAP_MIN;
if (bios_extmem >= HEAP_MIN && high_heap_size < HEAP_MIN) {
high_heap_size = HEAP_MIN;
high_heap_base = memtop - HEAP_MIN;