#ifndef _ASM_POWERPC_HUGETLB_H
#define _ASM_POWERPC_HUGETLB_H

#ifdef CONFIG_HUGETLB_PAGE
#include <asm/page.h>
#include <asm-generic/hugetlb.h>

extern struct kmem_cache *hugepte_cache;

#ifdef CONFIG_PPC_BOOK3S_64
/*
 * This should work for other subarchs too. But right now we use the
 * new format only for 64bit book3s
 */
static inline pte_t *hugepd_page(hugepd_t hpd)
{
        BUG_ON(!hugepd_ok(hpd));
        /*
         * We have only four bits to encode, MMU page size
         */
        BUILD_BUG_ON((MMU_PAGE_COUNT - 1) > 0xf);
        return (pte_t *)(hpd.pd & ~HUGEPD_SHIFT_MASK);
}

static inline unsigned int hugepd_mmu_psize(hugepd_t hpd)
{
        return (hpd.pd & HUGEPD_SHIFT_MASK) >> 2;
}

static inline unsigned int hugepd_shift(hugepd_t hpd)
{
        return mmu_psize_to_shift(hugepd_mmu_psize(hpd));
}

#else

static inline pte_t *hugepd_page(hugepd_t hpd)
{
        BUG_ON(!hugepd_ok(hpd));
        return (pte_t *)((hpd.pd & ~HUGEPD_SHIFT_MASK) | PD_HUGE);
}

static inline unsigned int hugepd_shift(hugepd_t hpd)
{
        return hpd.pd & HUGEPD_SHIFT_MASK;
}

#endif /* CONFIG_PPC_BOOK3S_64 */


static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
                                    unsigned pdshift)
{
        /*
         * On FSL BookE, we have multiple higher-level table entries that
         * point to the same hugepte.  Just use the first one since they're all
         * identical.  So for that case, idx=0.
         */
        unsigned long idx = 0;

        pte_t *dir = hugepd_page(hpd);
#ifndef CONFIG_PPC_FSL_BOOK3E
        idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd);
#endif

        return dir + idx;
}

pte_t *huge_pte_offset_and_shift(struct mm_struct *mm,
                                 unsigned long addr, unsigned *shift);

void flush_dcache_icache_hugepage(struct page *page);

#if defined(CONFIG_PPC_MM_SLICES)
int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
                           unsigned long len);
#else
static inline int is_hugepage_only_range(struct mm_struct *mm,
                                         unsigned long addr,
                                         unsigned long len)
{
        return 0;
}
#endif

void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
                            pte_t pte);
void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);

void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
                            unsigned long end, unsigned long floor,
                            unsigned long ceiling);

/*
 * The version of vma_mmu_pagesize() in arch/powerpc/mm/hugetlbpage.c needs
 * to override the version in mm/hugetlb.c
 */
#define vma_mmu_pagesize vma_mmu_pagesize

/*
 * If the arch doesn't supply something else, assume that hugepage
 * size aligned regions are ok without further preparation.
 */
static inline int prepare_hugepage_range(struct file *file,
                        unsigned long addr, unsigned long len)
{
        struct hstate *h = hstate_file(file);
        if (len & ~huge_page_mask(h))
                return -EINVAL;
        if (addr & ~huge_page_mask(h))
                return -EINVAL;
        return 0;
}

static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
                                   pte_t *ptep, pte_t pte)
{
        set_pte_at(mm, addr, ptep, pte);
}

static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
                                            unsigned long addr, pte_t *ptep)
{
#ifdef CONFIG_PPC64
        return __pte(pte_update(mm, addr, ptep, ~0UL, 0, 1));
#else
        return __pte(pte_update(ptep, ~0UL, 0));
#endif
}

static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
                                         unsigned long addr, pte_t *ptep)
{
        pte_t pte;
        pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
        flush_tlb_page(vma, addr);
}

static inline int huge_pte_none(pte_t pte)
{
        return pte_none(pte);
}

static inline pte_t huge_pte_wrprotect(pte_t pte)
{
        return pte_wrprotect(pte);
}

static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
                                             unsigned long addr, pte_t *ptep,
                                             pte_t pte, int dirty)
{
#ifdef HUGETLB_NEED_PRELOAD
        /*
         * The "return 1" forces a call of update_mmu_cache, which will write a
         * TLB entry.  Without this, platforms that don't do a write of the TLB
         * entry in the TLB miss handler asm will fault ad infinitum.
         */
        ptep_set_access_flags(vma, addr, ptep, pte, dirty);
        return 1;
#else
        return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
#endif
}

static inline pte_t huge_ptep_get(pte_t *ptep)
{
        return *ptep;
}

static inline void arch_clear_hugepage_flags(struct page *page)
{
}

#else /* ! CONFIG_HUGETLB_PAGE */
static inline void flush_hugetlb_page(struct vm_area_struct *vma,
                                      unsigned long vmaddr)
{
}

#define hugepd_shift(x) 0
static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
                                    unsigned pdshift)
{
        return 0;
}
#endif /* CONFIG_HUGETLB_PAGE */

/*
 * FSL Book3E platforms require special gpage handling - the gpages
 * are reserved early in the boot process by memblock instead of via
 * the .dts as on IBM platforms.
 */
#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_FSL_BOOK3E)
extern void __init reserve_hugetlb_gpages(void);
#else
static inline void reserve_hugetlb_gpages(void)
{
}
#endif

#endif /* _ASM_POWERPC_HUGETLB_H */