/* old function */
static int __init memsize(void)
{
	u32 size = (64 << 20);
	volatile u32 *addr = (u32 *)KSEG1ADDR(0x14000000 + size - 4);
	u32 *kernel_end = (u32 *)KSEG1ADDR(CPHYSADDR((u32)&_end));

	while (addr > kernel_end) {
		*addr = (u32)addr;
		size >>= 1;
		addr -= size >> 2;
	}

	do {
		addr += size >> 2;
		if (*addr != (u32)addr)
			break;
		size <<= 1;
	} while (size < (64 << 20));

	return size;
}

/* new one without volatile */
int __init memsize(void)
{
	u32 size = (64 << 20);
	u32 *addr = (u32 *)KSEG1ADDR(0x14000000 + size - 4);
	u32 *kernel_end = (u32 *)KSEG1ADDR(CPHYSADDR((u32)&_end));
	u32 *tmpaddr = addr;

	while (tmpaddr > kernel_end) {
		*tmpaddr = (u32)tmpaddr;
		size >>= 1;
		tmpaddr -= size >> 2;
	}

	do {
		tmpaddr += size >> 2;
		if (*tmpaddr != (u32)tmpaddr)
			break;
		size <<= 1;
	} while (size < (64 << 20));

	writel(tmpaddr, &addr);

	return size;
}