x86: add hugepagesz option on 64-bit

	hisax=		[HW,ISDN]

			See Documentation/isdn/README.HiSax.

	hugepages=	[HW,X86-32,IA-64] Maximal number of HugeTLB pages.

	hugepagesz=	[HW,IA-64,PPC] The size of the HugeTLB pages.

	hugepages=	[HW,X86-32,IA-64] HugeTLB pages to allocate at boot.

	hugepagesz=	[HW,IA-64,PPC,X86-64] The size of the HugeTLB pages.

			On x86 this option can be specified multiple times

			interleaved with hugepages= to reserve huge pages

			of different sizes. Valid pages sizes on x86-64

			are 2M (when the CPU supports "pse") and 1G (when the

			CPU supports the "pdpe1gb" cpuinfo flag)

			Note that 1GB pages can only be allocated at boot time

			using hugepages= and not freed afterwards.

	i8042.direct	[HW] Put keyboard port into non-translated mode

	i8042.dumbkbd	[HW] Pretend that controller can only read data from

#endif /*HAVE_ARCH_HUGETLB_UNMAPPED_AREA*/

#ifdef CONFIG_X86_64

static __init int setup_hugepagesz(char *opt)

{

	unsigned long ps = memparse(opt, &opt);

	if (ps == PMD_SIZE) {

		hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);

	} else if (ps == PUD_SIZE && cpu_has_gbpages) {

		hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);

	} else {

		printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n",

			ps >> 20);

		return 0;

	}

	return 1;

}

__setup("hugepagesz=", setup_hugepagesz);

#endif

#define HPAGE_MASK		(~(HPAGE_SIZE - 1))

#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)

#define HUGE_MAX_HSTATE 2

/* to align the pointer to the (next) page boundary */

#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)