BOOTMEM_BLOCK_ALIGN
size = roundup(ph[i].p_memsz, BOOTMEM_BLOCK_ALIGN);
maxp = roundup(maxp, BOOTMEM_BLOCK_ALIGN);
BOOTMEM_BLOCK_ALIGN);
size = roundup(argptr - argbuf, BOOTMEM_BLOCK_ALIGN);
#define BOOTMEM_BLOCK_MASK (BOOTMEM_BLOCK_ALIGN - 1)
symptr = (int32_t *)roundup((vaddr_t)end, BOOTMEM_BLOCK_ALIGN);