grub_memcpy
grub_memcpy(root, tmproot, sizeof(tmproot));
(void) grub_memcpy(name, arg, (val - arg));
(void) grub_memcpy(q, "amd64", 5);
(void) grub_memcpy(q, val, vlen);
grub_memcpy(mem, s1, SCREENBYTES);
grub_memcpy(mem, s2, SCREENBYTES);
grub_memcpy(mem, s4, SCREENBYTES);
grub_memcpy(mem, s8, SCREENBYTES);
void grub_memcpy(void *dest, const void *src, int len);