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Merge up to 2.6.8.1

/*
 * PPC64 (POWER4) Huge TLB Page Support for Kernel.
 *
 * Copyright (C) 2003 David Gibson, IBM Corporation.
 *
 * Based on the IA-32 version:
 * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com>
 */

#include <linux/init.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/pagemap.h>
#include <linux/smp_lock.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/sysctl.h>
#include <asm/mman.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
#include <asm/machdep.h>
#include <asm/cputable.h>
#include <asm/tlb.h>

#include <linux/sysctl.h>

/* HugePTE layout:
 *
 * 31 30 ... 15 14 13 12 10 9  8  7   6    5    4    3    2    1    0
 * PFN>>12..... -  -  -  -  -  -  HASH_IX....   2ND  HASH RW   -    HG=1
 */

#define HUGEPTE_SHIFT	15
#define _HUGEPAGE_PFN		0xffff8000
#define _HUGEPAGE_BAD		0x00007f00
#define _HUGEPAGE_HASHPTE	0x00000008
#define _HUGEPAGE_SECONDARY	0x00000010
#define _HUGEPAGE_GROUP_IX	0x000000e0
#define _HUGEPAGE_HPTEFLAGS	(_HUGEPAGE_HASHPTE | _HUGEPAGE_SECONDARY | \
				 _HUGEPAGE_GROUP_IX)
#define _HUGEPAGE_RW		0x00000004

typedef struct {unsigned int val;} hugepte_t;
#define hugepte_val(hugepte)	((hugepte).val)
#define __hugepte(x)		((hugepte_t) { (x) } )
#define hugepte_pfn(x)		\
	((unsigned long)(hugepte_val(x)>>HUGEPTE_SHIFT) << HUGETLB_PAGE_ORDER)
#define mk_hugepte(page,wr)	__hugepte( \
	((page_to_pfn(page)>>HUGETLB_PAGE_ORDER) << HUGEPTE_SHIFT ) \
	| (!!(wr) * _HUGEPAGE_RW) | _PMD_HUGEPAGE )

#define hugepte_bad(x)	( !(hugepte_val(x) & _PMD_HUGEPAGE) || \
			  (hugepte_val(x) & _HUGEPAGE_BAD) )
#define hugepte_page(x)	pfn_to_page(hugepte_pfn(x))
#define hugepte_none(x)	(!(hugepte_val(x) & _HUGEPAGE_PFN))


static void flush_hash_hugepage(mm_context_t context, unsigned long ea,
				hugepte_t pte, int local);

static inline unsigned int hugepte_update(hugepte_t *p, unsigned int clr,
					  unsigned int set)
{
	unsigned int old, tmp;

	__asm__ __volatile__(
	"1:	lwarx	%0,0,%3		# pte_update\n\
	andc	%1,%0,%4 \n\
	or	%1,%1,%5 \n\
	stwcx.	%1,0,%3 \n\
	bne-	1b"
	: "=&r" (old), "=&r" (tmp), "=m" (*p)
	: "r" (p), "r" (clr), "r" (set), "m" (*p)
	: "cc" );
	return old;
}

static inline void set_hugepte(hugepte_t *ptep, hugepte_t pte)
{
	hugepte_update(ptep, ~_HUGEPAGE_HPTEFLAGS,
		       hugepte_val(pte) & ~_HUGEPAGE_HPTEFLAGS);
}

static hugepte_t *hugepte_alloc(struct mm_struct *mm, unsigned long addr)
{
	pgd_t *pgd;
	pmd_t *pmd = NULL;

	BUG_ON(!in_hugepage_area(mm->context, addr));

	pgd = pgd_offset(mm, addr);
	pmd = pmd_alloc(mm, pgd, addr);

	/* We shouldn't find a (normal) PTE page pointer here */
	BUG_ON(!pmd_none(*pmd) && !pmd_hugepage(*pmd));
	
	return (hugepte_t *)pmd;
}

static hugepte_t *hugepte_offset(struct mm_struct *mm, unsigned long addr)
{
	pgd_t *pgd;
	pmd_t *pmd = NULL;

	BUG_ON(!in_hugepage_area(mm->context, addr));

	pgd = pgd_offset(mm, addr);
	if (pgd_none(*pgd))
		return NULL;

	pmd = pmd_offset(pgd, addr);

	/* We shouldn't find a (normal) PTE page pointer here */
	BUG_ON(!pmd_none(*pmd) && !pmd_hugepage(*pmd));

	return (hugepte_t *)pmd;
}

static void setup_huge_pte(struct mm_struct *mm, struct page *page,
			   hugepte_t *ptep, int write_access)
{
	hugepte_t entry;
	int i;

	mm->rss += (HPAGE_SIZE / PAGE_SIZE);
	entry = mk_hugepte(page, write_access);
	for (i = 0; i < HUGEPTE_BATCH_SIZE; i++)
		set_hugepte(ptep+i, entry);
}

static void teardown_huge_pte(hugepte_t *ptep)
{
	int i;

	for (i = 0; i < HUGEPTE_BATCH_SIZE; i++)
		pmd_clear((pmd_t *)(ptep+i));
}

/*
 * This function checks for proper alignment of input addr and len parameters.
 */
int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
{
	if (len & ~HPAGE_MASK)
		return -EINVAL;
	if (addr & ~HPAGE_MASK)
		return -EINVAL;
	if (! (within_hugepage_low_range(addr, len)
	       || within_hugepage_high_range(addr, len)) )
		return -EINVAL;
	return 0;
}

static void flush_segments(void *parm)
{
	u16 segs = (unsigned long) parm;
	unsigned long i;

	asm volatile("isync" : : : "memory");

	for (i = 0; i < 16; i++) {
		if (! (segs & (1U << i)))
			continue;
		asm volatile("slbie %0" : : "r" (i << SID_SHIFT));
	}

	asm volatile("isync" : : : "memory");
}

static int prepare_low_seg_for_htlb(struct mm_struct *mm, unsigned long seg)
{
	unsigned long start = seg << SID_SHIFT;
	unsigned long end = (seg+1) << SID_SHIFT;
	struct vm_area_struct *vma;
	unsigned long addr;
	struct mmu_gather *tlb;

	BUG_ON(seg >= 16);

	/* Check no VMAs are in the region */
	vma = find_vma(mm, start);
	if (vma && (vma->vm_start < end))
		return -EBUSY;

	/* Clean up any leftover PTE pages in the region */
	spin_lock(&mm->page_table_lock);
	tlb = tlb_gather_mmu(mm, 0);
	for (addr = start; addr < end; addr += PMD_SIZE) {
		pgd_t *pgd = pgd_offset(mm, addr);
		pmd_t *pmd;
		struct page *page;
		pte_t *pte;
		int i;

		if (pgd_none(*pgd))
			continue;
		pmd = pmd_offset(pgd, addr);
		if (!pmd || pmd_none(*pmd))
			continue;
		if (pmd_bad(*pmd)) {
			pmd_ERROR(*pmd);
			pmd_clear(pmd);
			continue;
		}
		pte = (pte_t *)pmd_page_kernel(*pmd);
		/* No VMAs, so there should be no PTEs, check just in case. */
		for (i = 0; i < PTRS_PER_PTE; i++) {
			BUG_ON(!pte_none(*pte));
			pte++;
		}
		page = pmd_page(*pmd);
		pmd_clear(pmd);
		dec_page_state(nr_page_table_pages);
		pte_free_tlb(tlb, page);
	}
	tlb_finish_mmu(tlb, start, end);
	spin_unlock(&mm->page_table_lock);

	return 0;
}

static int open_low_hpage_segs(struct mm_struct *mm, u16 newsegs)
{
	unsigned long i;

	newsegs &= ~(mm->context.htlb_segs);
	if (! newsegs)
		return 0; /* The segments we want are already open */

	for (i = 0; i < 16; i++)
		if ((1 << i) & newsegs)
			if (prepare_low_seg_for_htlb(mm, i) != 0)
				return -EBUSY;

	mm->context.htlb_segs |= newsegs;
	/* the context change must make it to memory before the flush,
	 * so that further SLB misses do the right thing. */
	mb();
	on_each_cpu(flush_segments, (void *)(unsigned long)newsegs, 0, 1);

	return 0;
}

int prepare_hugepage_range(unsigned long addr, unsigned long len)
{
	if (within_hugepage_high_range(addr, len))
		return 0;
	else if ((addr < 0x100000000) && ((addr+len) < 0x100000000)) {
		int err;
		/* Yes, we need both tests, in case addr+len overflows
		 * 64-bit arithmetic */
		err = open_low_hpage_segs(current->mm,
					  LOW_ESID_MASK(addr, len));
		if (err)
			printk(KERN_DEBUG "prepare_hugepage_range(%lx, %lx)"
			       " failed (segs: 0x%04hx)\n", addr, len,
			       LOW_ESID_MASK(addr, len));
		return err;
	}

	return -EINVAL;
}

int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
			struct vm_area_struct *vma)
{
	hugepte_t *src_pte, *dst_pte, entry;
	struct page *ptepage;
	unsigned long addr = vma->vm_start;
	unsigned long end = vma->vm_end;

	while (addr < end) {
		BUG_ON(! in_hugepage_area(src->context, addr));
		BUG_ON(! in_hugepage_area(dst->context, addr));

		dst_pte = hugepte_alloc(dst, addr);
		if (!dst_pte)
			return -ENOMEM;

		src_pte = hugepte_offset(src, addr);
		entry = *src_pte;
		
		if ((addr % HPAGE_SIZE) == 0) {
			/* This is the first hugepte in a batch */
			ptepage = hugepte_page(entry);
			get_page(ptepage);
			dst->rss += (HPAGE_SIZE / PAGE_SIZE);
		}
		set_hugepte(dst_pte, entry);


		addr += PMD_SIZE;
	}
	return 0;
}

int
follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
		    struct page **pages, struct vm_area_struct **vmas,
		    unsigned long *position, int *length, int i)
{
	unsigned long vpfn, vaddr = *position;
	int remainder = *length;

	WARN_ON(!is_vm_hugetlb_page(vma));

	vpfn = vaddr/PAGE_SIZE;
	while (vaddr < vma->vm_end && remainder) {
		BUG_ON(!in_hugepage_area(mm->context, vaddr));

		if (pages) {
			hugepte_t *pte;
			struct page *page;

			pte = hugepte_offset(mm, vaddr);

			/* hugetlb should be locked, and hence, prefaulted */
			WARN_ON(!pte || hugepte_none(*pte));

			page = &hugepte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)];

			WARN_ON(!PageCompound(page));

			get_page(page);
			pages[i] = page;
		}

		if (vmas)
			vmas[i] = vma;

		vaddr += PAGE_SIZE;
		++vpfn;
		--remainder;
		++i;
	}

	*length = remainder;
	*position = vaddr;

	return i;
}

struct page *
follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
{
	return ERR_PTR(-EINVAL);
}

int pmd_huge(pmd_t pmd)
{
	return pmd_hugepage(pmd);
}

struct page *
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
		pmd_t *pmd, int write)
{
	struct page *page;

	BUG_ON(! pmd_hugepage(*pmd));

	page = hugepte_page(*(hugepte_t *)pmd);
	if (page)
		page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT);
	return page;
}

void unmap_hugepage_range(struct vm_area_struct *vma,
			  unsigned long start, unsigned long end)
{
	struct mm_struct *mm = vma->vm_mm;
	unsigned long addr;
	hugepte_t *ptep;
	struct page *page;
	int cpu;
	int local = 0;
	cpumask_t tmp;

	WARN_ON(!is_vm_hugetlb_page(vma));
	BUG_ON((start % HPAGE_SIZE) != 0);
	BUG_ON((end % HPAGE_SIZE) != 0);

	/* XXX are there races with checking cpu_vm_mask? - Anton */
	cpu = get_cpu();
	tmp = cpumask_of_cpu(cpu);
	if (cpus_equal(vma->vm_mm->cpu_vm_mask, tmp))
		local = 1;

	for (addr = start; addr < end; addr += HPAGE_SIZE) {
		hugepte_t pte;

		BUG_ON(!in_hugepage_area(mm->context, addr));

		ptep = hugepte_offset(mm, addr);
		if (!ptep || hugepte_none(*ptep))
			continue;

		pte = *ptep;
		page = hugepte_page(pte);
		teardown_huge_pte(ptep);
		
		if (hugepte_val(pte) & _HUGEPAGE_HASHPTE)
			flush_hash_hugepage(mm->context, addr,
					    pte, local);

		put_page(page);
	}
	put_cpu();

	mm->rss -= (end - start) >> PAGE_SHIFT;
}

int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma)
{
	struct mm_struct *mm = current->mm;
	unsigned long addr;
	int ret = 0;

	WARN_ON(!is_vm_hugetlb_page(vma));
	BUG_ON((vma->vm_start % HPAGE_SIZE) != 0);
	BUG_ON((vma->vm_end % HPAGE_SIZE) != 0);

	spin_lock(&mm->page_table_lock);
	for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) {
		unsigned long idx;
		hugepte_t *pte = hugepte_alloc(mm, addr);
		struct page *page;

		BUG_ON(!in_hugepage_area(mm->context, addr));

		if (!pte) {
			ret = -ENOMEM;
			goto out;
		}
		if (!hugepte_none(*pte))
			continue;

		idx = ((addr - vma->vm_start) >> HPAGE_SHIFT)
			+ (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
		page = find_get_page(mapping, idx);
		if (!page) {
			/* charge the fs quota first */
			if (hugetlb_get_quota(mapping)) {
				ret = -ENOMEM;
				goto out;
			}
			page = alloc_huge_page();
			if (!page) {
				hugetlb_put_quota(mapping);
				ret = -ENOMEM;
				goto out;
			}
			ret = add_to_page_cache(page, mapping, idx, GFP_ATOMIC);
			if (! ret) {
				unlock_page(page);
			} else {
				hugetlb_put_quota(mapping);
				free_huge_page(page);
				goto out;
			}
		}
		setup_huge_pte(mm, page, pte, vma->vm_flags & VM_WRITE);
	}
out:
	spin_unlock(&mm->page_table_lock);
	return ret;
}

/* Because we have an exclusive hugepage region which lies within the
 * normal user address space, we have to take special measures to make
 * non-huge mmap()s evade the hugepage reserved regions. */
unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
				     unsigned long len, unsigned long pgoff,
				     unsigned long flags)
{
	struct mm_struct *mm = current->mm;
	struct vm_area_struct *vma;
	unsigned long start_addr;

	if (len > TASK_SIZE)
		return -ENOMEM;

	if (addr) {
		addr = PAGE_ALIGN(addr);
		vma = find_vma(mm, addr);
		if (((TASK_SIZE - len) >= addr)
		    && (!vma || (addr+len) <= vma->vm_start)
		    && !is_hugepage_only_range(addr,len))
			return addr;
	}
	start_addr = addr = mm->free_area_cache;

full_search:
	vma = find_vma(mm, addr);
	while (TASK_SIZE - len >= addr) {
		BUG_ON(vma && (addr >= vma->vm_end));

		if (touches_hugepage_low_range(addr, len)) {
			addr = ALIGN(addr+1, 1<<SID_SHIFT);
			vma = find_vma(mm, addr);
			continue;
		}
		if (touches_hugepage_high_range(addr, len)) {
			addr = TASK_HPAGE_END;
			vma = find_vma(mm, addr);
			continue;
		}
		if (!vma || addr + len <= vma->vm_start) {
			/*
			 * Remember the place where we stopped the search:
			 */
			mm->free_area_cache = addr + len;
			return addr;
		}
		addr = vma->vm_end;
		vma = vma->vm_next;
	}

	/* Make sure we didn't miss any holes */
	if (start_addr != TASK_UNMAPPED_BASE) {
		start_addr = addr = TASK_UNMAPPED_BASE;
		goto full_search;
	}
	return -ENOMEM;
}

static unsigned long htlb_get_low_area(unsigned long len, u16 segmask)
{
	unsigned long addr = 0;
	struct vm_area_struct *vma;

	vma = find_vma(current->mm, addr);
	while (addr + len <= 0x100000000UL) {
		BUG_ON(vma && (addr >= vma->vm_end)); /* invariant */

		if (! __within_hugepage_low_range(addr, len, segmask)) {
			addr = ALIGN(addr+1, 1<<SID_SHIFT);
			vma = find_vma(current->mm, addr);
			continue;
		}

		if (!vma || (addr + len) <= vma->vm_start)
			return addr;
		addr = ALIGN(vma->vm_end, HPAGE_SIZE);
		/* Depending on segmask this might not be a confirmed
		 * hugepage region, so the ALIGN could have skipped
		 * some VMAs */
		vma = find_vma(current->mm, addr);
	}

	return -ENOMEM;
}

static unsigned long htlb_get_high_area(unsigned long len)
{
	unsigned long addr = TASK_HPAGE_BASE;
	struct vm_area_struct *vma;

	vma = find_vma(current->mm, addr);
	for (vma = find_vma(current->mm, addr);
	     addr + len <= TASK_HPAGE_END;
	     vma = vma->vm_next) {
		BUG_ON(vma && (addr >= vma->vm_end)); /* invariant */
		BUG_ON(! within_hugepage_high_range(addr, len));

		if (!vma || (addr + len) <= vma->vm_start)
			return addr;
		addr = ALIGN(vma->vm_end, HPAGE_SIZE);
		/* Because we're in a hugepage region, this alignment
		 * should not skip us over any VMAs */
	}

	return -ENOMEM;
}

unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
					unsigned long len, unsigned long pgoff,
					unsigned long flags)
{
	if (len & ~HPAGE_MASK)
		return -EINVAL;

	if (!(cur_cpu_spec->cpu_features & CPU_FTR_16M_PAGE))
		return -EINVAL;

	if (test_thread_flag(TIF_32BIT)) {
		int lastshift = 0;
		u16 segmask, cursegs = current->mm->context.htlb_segs;

		/* First see if we can do the mapping in the existing
		 * low hpage segments */
		addr = htlb_get_low_area(len, cursegs);
		if (addr != -ENOMEM)
			return addr;

		for (segmask = LOW_ESID_MASK(0x100000000UL-len, len);
		     ! lastshift; segmask >>=1) {
			if (segmask & 1)
				lastshift = 1;

			addr = htlb_get_low_area(len, cursegs | segmask);
			if ((addr != -ENOMEM)
			    && open_low_hpage_segs(current->mm, segmask) == 0)
				return addr;
		}
		printk(KERN_DEBUG "hugetlb_get_unmapped_area() unable to open"
		       " enough segments\n");
		return -ENOMEM;
	} else {
		return htlb_get_high_area(len);
	}
}

int hash_huge_page(struct mm_struct *mm, unsigned long access,
		   unsigned long ea, unsigned long vsid, int local)
{
	hugepte_t *ptep;
	unsigned long va, vpn;
	int is_write;
	hugepte_t old_pte, new_pte;
	unsigned long hpteflags, prpn, flags;
	long slot;

	/* We have to find the first hugepte in the batch, since
	 * that's the one that will store the HPTE flags */
	ea &= HPAGE_MASK;
	ptep = hugepte_offset(mm, ea);

	/* Search the Linux page table for a match with va */
	va = (vsid << 28) | (ea & 0x0fffffff);
	vpn = va >> HPAGE_SHIFT;

	/*
	 * If no pte found or not present, send the problem up to
	 * do_page_fault
	 */
	if (unlikely(!ptep || hugepte_none(*ptep)))
		return 1;

	BUG_ON(hugepte_bad(*ptep));

	/* 
	 * Check the user's access rights to the page.  If access should be
	 * prevented then send the problem up to do_page_fault.
	 */
	is_write = access & _PAGE_RW;
	if (unlikely(is_write && !(hugepte_val(*ptep) & _HUGEPAGE_RW)))
		return 1;

	/*
	 * At this point, we have a pte (old_pte) which can be used to build
	 * or update an HPTE. There are 2 cases:
	 *
	 * 1. There is a valid (present) pte with no associated HPTE (this is 
	 *	the most common case)
	 * 2. There is a valid (present) pte with an associated HPTE. The
	 *	current values of the pp bits in the HPTE prevent access
	 *	because we are doing software DIRTY bit management and the
	 *	page is currently not DIRTY. 
	 */

	spin_lock_irqsave(&mm->page_table_lock, flags);

	old_pte = *ptep;
	new_pte = old_pte;

	hpteflags = 0x2 | (! (hugepte_val(new_pte) & _HUGEPAGE_RW));

	/* Check if pte already has an hpte (case 2) */
	if (unlikely(hugepte_val(old_pte) & _HUGEPAGE_HASHPTE)) {
		/* There MIGHT be an HPTE for this pte */
		unsigned long hash, slot;

		hash = hpt_hash(vpn, 1);
		if (hugepte_val(old_pte) & _HUGEPAGE_SECONDARY)
			hash = ~hash;
		slot = (hash & htab_data.htab_hash_mask) * HPTES_PER_GROUP;
		slot += (hugepte_val(old_pte) & _HUGEPAGE_GROUP_IX) >> 5;

		if (ppc_md.hpte_updatepp(slot, hpteflags, va, 1, local) == -1)
			hugepte_val(old_pte) &= ~_HUGEPAGE_HPTEFLAGS;
	}

	if (likely(!(hugepte_val(old_pte) & _HUGEPAGE_HASHPTE))) {
		unsigned long hash = hpt_hash(vpn, 1);
		unsigned long hpte_group;

		prpn = hugepte_pfn(old_pte);

repeat:
		hpte_group = ((hash & htab_data.htab_hash_mask) *
			      HPTES_PER_GROUP) & ~0x7UL;

		/* Update the linux pte with the HPTE slot */
		hugepte_val(new_pte) &= ~_HUGEPAGE_HPTEFLAGS;
		hugepte_val(new_pte) |= _HUGEPAGE_HASHPTE;

		/* Add in WIMG bits */
		/* XXX We should store these in the pte */
		hpteflags |= _PAGE_COHERENT;

		slot = ppc_md.hpte_insert(hpte_group, va, prpn, 0,
					  hpteflags, 0, 1);

		/* Primary is full, try the secondary */
		if (unlikely(slot == -1)) {
			hugepte_val(new_pte) |= _HUGEPAGE_SECONDARY;
			hpte_group = ((~hash & htab_data.htab_hash_mask) *
				      HPTES_PER_GROUP) & ~0x7UL; 
			slot = ppc_md.hpte_insert(hpte_group, va, prpn,
						  1, hpteflags, 0, 1);
			if (slot == -1) {
				if (mftb() & 0x1)
					hpte_group = ((hash & htab_data.htab_hash_mask) * HPTES_PER_GROUP) & ~0x7UL;

				ppc_md.hpte_remove(hpte_group);
				goto repeat;
                        }
		}

		if (unlikely(slot == -2))
			panic("hash_huge_page: pte_insert failed\n");

		hugepte_val(new_pte) |= (slot<<5) & _HUGEPAGE_GROUP_IX;

		/* 
		 * No need to use ldarx/stdcx here because all who
		 * might be updating the pte will hold the
		 * page_table_lock or the hash_table_lock
		 * (we hold both)
		 */
		*ptep = new_pte;
	}

	spin_unlock_irqrestore(&mm->page_table_lock, flags);

	return 0;
}

static void flush_hash_hugepage(mm_context_t context, unsigned long ea,
				hugepte_t pte, int local)
{
	unsigned long vsid, vpn, va, hash, slot;

	BUG_ON(hugepte_bad(pte));
	BUG_ON(!in_hugepage_area(context, ea));

	vsid = get_vsid(context.id, ea);

	va = (vsid << 28) | (ea & 0x0fffffff);
	vpn = va >> LARGE_PAGE_SHIFT;
	hash = hpt_hash(vpn, 1);
	if (hugepte_val(pte) & _HUGEPAGE_SECONDARY)
		hash = ~hash;
	slot = (hash & htab_data.htab_hash_mask) * HPTES_PER_GROUP;
	slot += (hugepte_val(pte) & _HUGEPAGE_GROUP_IX) >> 5;

	ppc_md.hpte_invalidate(slot, va, 1, local);
}