/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2003 Ralf Baechle
 */
#ifndef _ASM_PGTABLE_H
#define _ASM_PGTABLE_H

#include <linux/mm_types.h>
#include <linux/mmzone.h>
#ifdef CONFIG_32BIT
#include <asm/pgtable-32.h>
#endif
#ifdef CONFIG_64BIT
#include <asm/pgtable-64.h>
#endif

#include <asm/cmpxchg.h>
#include <asm/io.h>
#include <asm/pgtable-bits.h>
#include <asm/cpu-features.h>

struct mm_struct;
struct vm_area_struct;

#define PAGE_SHARED     vm_get_page_prot(VM_READ|VM_WRITE|VM_SHARED)

#define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
                                 _PAGE_GLOBAL | _page_cachable_default)
#define PAGE_KERNEL_NC  __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
                                 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
                        __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)

/*
 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
 * execute, and consider it to be the same as read. Also, write
 * permissions imply read permissions. This is the closest we can get
 * by reasonable means..
 */

/*
 * Dummy values to fill the table in mmap.c
 * The real values will be generated at runtime
 */
#define __P000 __pgprot(0)
#define __P001 __pgprot(0)
#define __P010 __pgprot(0)
#define __P011 __pgprot(0)
#define __P100 __pgprot(0)
#define __P101 __pgprot(0)
#define __P110 __pgprot(0)
#define __P111 __pgprot(0)

#define __S000 __pgprot(0)
#define __S001 __pgprot(0)
#define __S010 __pgprot(0)
#define __S011 __pgprot(0)
#define __S100 __pgprot(0)
#define __S101 __pgprot(0)
#define __S110 __pgprot(0)
#define __S111 __pgprot(0)

extern unsigned long _page_cachable_default;
extern void __update_cache(unsigned long address, pte_t pte);

/*
 * ZERO_PAGE is a global shared page that is always zero; used
 * for zero-mapped memory areas etc..
 */

extern unsigned long empty_zero_page;
extern unsigned long zero_page_mask;

#define ZERO_PAGE(vaddr) \
        (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
#define __HAVE_COLOR_ZERO_PAGE

extern void paging_init(void);

/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */
#define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))

#define __pmd_page(pmd)         (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#ifndef CONFIG_TRANSPARENT_HUGEPAGE
#define pmd_page(pmd)           __pmd_page(pmd)
#endif /* CONFIG_TRANSPARENT_HUGEPAGE  */

#define pmd_page_vaddr(pmd)     pmd_val(pmd)

#define htw_stop()                                                      \
do {                                                                    \
        unsigned long __flags;                                          \
                                                                        \
        if (cpu_has_htw) {                                              \
                local_irq_save(__flags);                                \
                if(!raw_current_cpu_data.htw_seq++) {                   \
                        write_c0_pwctl(read_c0_pwctl() &                \
                                       ~(1 << MIPS_PWCTL_PWEN_SHIFT));  \
                        back_to_back_c0_hazard();                       \
                }                                                       \
                local_irq_restore(__flags);                             \
        }                                                               \
} while(0)

#define htw_start()                                                     \
do {                                                                    \
        unsigned long __flags;                                          \
                                                                        \
        if (cpu_has_htw) {                                              \
                local_irq_save(__flags);                                \
                if (!--raw_current_cpu_data.htw_seq) {                  \
                        write_c0_pwctl(read_c0_pwctl() |                \
                                       (1 << MIPS_PWCTL_PWEN_SHIFT));   \
                        back_to_back_c0_hazard();                       \
                }                                                       \
                local_irq_restore(__flags);                             \
        }                                                               \
} while(0)

static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
                              pte_t *ptep, pte_t pteval);

#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)

#ifdef CONFIG_XPA
# define pte_none(pte)          (!(((pte).pte_high) & ~_PAGE_GLOBAL))
#else
# define pte_none(pte)          (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
#endif

#define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
#define pte_no_exec(pte)        ((pte).pte_low & _PAGE_NO_EXEC)

static inline void set_pte(pte_t *ptep, pte_t pte)
{
        ptep->pte_high = pte.pte_high;
        smp_wmb();
        ptep->pte_low = pte.pte_low;

#ifdef CONFIG_XPA
        if (pte.pte_high & _PAGE_GLOBAL) {
#else
        if (pte.pte_low & _PAGE_GLOBAL) {
#endif
                pte_t *buddy = ptep_buddy(ptep);
                /*
                 * Make sure the buddy is global too (if it's !none,
                 * it better already be global)
                 */
                if (pte_none(*buddy)) {
                        if (!IS_ENABLED(CONFIG_XPA))
                                buddy->pte_low |= _PAGE_GLOBAL;
                        buddy->pte_high |= _PAGE_GLOBAL;
                }
        }
}

static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
        pte_t null = __pte(0);

        htw_stop();
        /* Preserve global status for the pair */
        if (IS_ENABLED(CONFIG_XPA)) {
                if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
                        null.pte_high = _PAGE_GLOBAL;
        } else {
                if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
                        null.pte_low = null.pte_high = _PAGE_GLOBAL;
        }

        set_pte_at(mm, addr, ptep, null);
        htw_start();
}
#else

#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
#define pte_no_exec(pte)        (pte_val(pte) & _PAGE_NO_EXEC)

/*
 * Certain architectures need to do special things when pte's
 * within a page table are directly modified.  Thus, the following
 * hook is made available.
 */
static inline void set_pte(pte_t *ptep, pte_t pteval)
{
        *ptep = pteval;
#if !defined(CONFIG_CPU_R3K_TLB)
        if (pte_val(pteval) & _PAGE_GLOBAL) {
                pte_t *buddy = ptep_buddy(ptep);
                /*
                 * Make sure the buddy is global too (if it's !none,
                 * it better already be global)
                 */
# if defined(CONFIG_PHYS_ADDR_T_64BIT) && !defined(CONFIG_CPU_MIPS32)
                cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);
# else
                cmpxchg(&buddy->pte, 0, _PAGE_GLOBAL);
# endif
        }
#endif
}

static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
        htw_stop();
#if !defined(CONFIG_CPU_R3K_TLB)
        /* Preserve global status for the pair */
        if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
                set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
        else
#endif
                set_pte_at(mm, addr, ptep, __pte(0));
        htw_start();
}
#endif

static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
                              pte_t *ptep, pte_t pteval)
{

        if (!pte_present(pteval))
                goto cache_sync_done;

        if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
                goto cache_sync_done;

        __update_cache(addr, pteval);
cache_sync_done:
        set_pte(ptep, pteval);
}

/*
 * (pmds are folded into puds so this doesn't get actually called,
 * but the define is needed for a generic inline function.)
 */
#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)

#ifndef __PAGETABLE_PMD_FOLDED
/*
 * (puds are folded into pgds so this doesn't get actually called,
 * but the define is needed for a generic inline function.)
 */
#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
#endif

#define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
#define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
#define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)

/*
 * We used to declare this array with size but gcc 3.3 and older are not able
 * to find that this expression is a constant, so the size is dropped.
 */
extern pgd_t swapper_pg_dir[];

/*
 * Platform specific pte_special() and pte_mkspecial() definitions
 * are required only when ARCH_HAS_PTE_SPECIAL is enabled.
 */
#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
static inline int pte_special(pte_t pte)
{
        return pte.pte_low & _PAGE_SPECIAL;
}

static inline pte_t pte_mkspecial(pte_t pte)
{
        pte.pte_low |= _PAGE_SPECIAL;
        return pte;
}
#else
static inline int pte_special(pte_t pte)
{
        return pte_val(pte) & _PAGE_SPECIAL;
}

static inline pte_t pte_mkspecial(pte_t pte)
{
        pte_val(pte) |= _PAGE_SPECIAL;
        return pte;
}
#endif
#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }

static inline pte_t pte_wrprotect(pte_t pte)
{
        pte.pte_low  &= ~_PAGE_WRITE;
        if (!IS_ENABLED(CONFIG_XPA))
                pte.pte_low &= ~_PAGE_SILENT_WRITE;
        pte.pte_high &= ~_PAGE_SILENT_WRITE;
        return pte;
}

static inline pte_t pte_mkclean(pte_t pte)
{
        pte.pte_low  &= ~_PAGE_MODIFIED;
        if (!IS_ENABLED(CONFIG_XPA))
                pte.pte_low &= ~_PAGE_SILENT_WRITE;
        pte.pte_high &= ~_PAGE_SILENT_WRITE;
        return pte;
}

static inline pte_t pte_mkold(pte_t pte)
{
        pte.pte_low  &= ~_PAGE_ACCESSED;
        if (!IS_ENABLED(CONFIG_XPA))
                pte.pte_low &= ~_PAGE_SILENT_READ;
        pte.pte_high &= ~_PAGE_SILENT_READ;
        return pte;
}

static inline pte_t pte_mkwrite(pte_t pte)
{
        pte.pte_low |= _PAGE_WRITE;
        if (pte.pte_low & _PAGE_MODIFIED) {
                if (!IS_ENABLED(CONFIG_XPA))
                        pte.pte_low |= _PAGE_SILENT_WRITE;
                pte.pte_high |= _PAGE_SILENT_WRITE;
        }
        return pte;
}

static inline pte_t pte_mkdirty(pte_t pte)
{
        pte.pte_low |= _PAGE_MODIFIED;
        if (pte.pte_low & _PAGE_WRITE) {
                if (!IS_ENABLED(CONFIG_XPA))
                        pte.pte_low |= _PAGE_SILENT_WRITE;
                pte.pte_high |= _PAGE_SILENT_WRITE;
        }
        return pte;
}

static inline pte_t pte_mkyoung(pte_t pte)
{
        pte.pte_low |= _PAGE_ACCESSED;
        if (!(pte.pte_low & _PAGE_NO_READ)) {
                if (!IS_ENABLED(CONFIG_XPA))
                        pte.pte_low |= _PAGE_SILENT_READ;
                pte.pte_high |= _PAGE_SILENT_READ;
        }
        return pte;
}
#else
static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }

static inline pte_t pte_wrprotect(pte_t pte)
{
        pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
        return pte;
}

static inline pte_t pte_mkclean(pte_t pte)
{
        pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
        return pte;
}

static inline pte_t pte_mkold(pte_t pte)
{
        pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
        return pte;
}

static inline pte_t pte_mkwrite(pte_t pte)
{
        pte_val(pte) |= _PAGE_WRITE;
        if (pte_val(pte) & _PAGE_MODIFIED)
                pte_val(pte) |= _PAGE_SILENT_WRITE;
        return pte;
}

static inline pte_t pte_mkdirty(pte_t pte)
{
        pte_val(pte) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY;
        if (pte_val(pte) & _PAGE_WRITE)
                pte_val(pte) |= _PAGE_SILENT_WRITE;
        return pte;
}

static inline pte_t pte_mkyoung(pte_t pte)
{
        pte_val(pte) |= _PAGE_ACCESSED;
        if (!(pte_val(pte) & _PAGE_NO_READ))
                pte_val(pte) |= _PAGE_SILENT_READ;
        return pte;
}

#define pte_sw_mkyoung  pte_mkyoung

#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }

static inline pte_t pte_mkhuge(pte_t pte)
{
        pte_val(pte) |= _PAGE_HUGE;
        return pte;
}
#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */

#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
static inline bool pte_soft_dirty(pte_t pte)
{
        return pte_val(pte) & _PAGE_SOFT_DIRTY;
}
#define pte_swp_soft_dirty pte_soft_dirty

static inline pte_t pte_mksoft_dirty(pte_t pte)
{
        pte_val(pte) |= _PAGE_SOFT_DIRTY;
        return pte;
}
#define pte_swp_mksoft_dirty pte_mksoft_dirty

static inline pte_t pte_clear_soft_dirty(pte_t pte)
{
        pte_val(pte) &= ~(_PAGE_SOFT_DIRTY);
        return pte;
}
#define pte_swp_clear_soft_dirty pte_clear_soft_dirty

#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */

#endif

/*
 * Macro to make mark a page protection value as "uncacheable".  Note
 * that "protection" is really a misnomer here as the protection value
 * contains the memory attribute bits, dirty bits, and various other
 * bits as well.
 */
#define pgprot_noncached pgprot_noncached

static inline pgprot_t pgprot_noncached(pgprot_t _prot)
{
        unsigned long prot = pgprot_val(_prot);

        prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;

        return __pgprot(prot);
}

#define pgprot_writecombine pgprot_writecombine

static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
{
        unsigned long prot = pgprot_val(_prot);

        /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
        prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;

        return __pgprot(prot);
}

static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
                                                unsigned long address)
{
}

#define __HAVE_ARCH_PTE_SAME
static inline int pte_same(pte_t pte_a, pte_t pte_b)
{
        return pte_val(pte_a) == pte_val(pte_b);
}

#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
static inline int ptep_set_access_flags(struct vm_area_struct *vma,
                                        unsigned long address, pte_t *ptep,
                                        pte_t entry, int dirty)
{
        if (!pte_same(*ptep, entry))
                set_pte_at(vma->vm_mm, address, ptep, entry);
        /*
         * update_mmu_cache will unconditionally execute, handling both
         * the case that the PTE changed and the spurious fault case.
         */
        return true;
}

/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */
#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))

#if defined(CONFIG_XPA)
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
        pte.pte_low  &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
        pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
        pte.pte_low  |= pgprot_val(newprot) & ~_PFNX_MASK;
        pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
        return pte;
}
#elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
        pte.pte_low  &= _PAGE_CHG_MASK;
        pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
        pte.pte_low  |= pgprot_val(newprot);
        pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
        return pte;
}
#else
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
        pte_val(pte) &= _PAGE_CHG_MASK;
        pte_val(pte) |= pgprot_val(newprot) & ~_PAGE_CHG_MASK;
        if ((pte_val(pte) & _PAGE_ACCESSED) && !(pte_val(pte) & _PAGE_NO_READ))
                pte_val(pte) |= _PAGE_SILENT_READ;
        return pte;
}
#endif


extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
        pte_t pte);

static inline void update_mmu_cache(struct vm_area_struct *vma,
        unsigned long address, pte_t *ptep)
{
        pte_t pte = *ptep;
        __update_tlb(vma, address, pte);
}

#define __HAVE_ARCH_UPDATE_MMU_TLB
#define update_mmu_tlb  update_mmu_cache

static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
        unsigned long address, pmd_t *pmdp)
{
        pte_t pte = *(pte_t *)pmdp;

        __update_tlb(vma, address, pte);
}

#define kern_addr_valid(addr)   (1)

/*
 * Allow physical addresses to be fixed up to help 36-bit peripherals.
 */
#ifdef CONFIG_MIPS_FIXUP_BIGPHYS_ADDR
phys_addr_t fixup_bigphys_addr(phys_addr_t addr, phys_addr_t size);
int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr,
                unsigned long pfn, unsigned long size, pgprot_t prot);
#define io_remap_pfn_range io_remap_pfn_range
#else
#define fixup_bigphys_addr(addr, size)  (addr)
#endif /* CONFIG_MIPS_FIXUP_BIGPHYS_ADDR */

#ifdef CONFIG_TRANSPARENT_HUGEPAGE

/* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
#define pmdp_establish generic_pmdp_establish

#define has_transparent_hugepage has_transparent_hugepage
extern int has_transparent_hugepage(void);

static inline int pmd_trans_huge(pmd_t pmd)
{
        return !!(pmd_val(pmd) & _PAGE_HUGE);
}

static inline pmd_t pmd_mkhuge(pmd_t pmd)
{
        pmd_val(pmd) |= _PAGE_HUGE;

        return pmd;
}

extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
                       pmd_t *pmdp, pmd_t pmd);

#define pmd_write pmd_write
static inline int pmd_write(pmd_t pmd)
{
        return !!(pmd_val(pmd) & _PAGE_WRITE);
}

static inline pmd_t pmd_wrprotect(pmd_t pmd)
{
        pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
        return pmd;
}

static inline pmd_t pmd_mkwrite(pmd_t pmd)
{
        pmd_val(pmd) |= _PAGE_WRITE;
        if (pmd_val(pmd) & _PAGE_MODIFIED)
                pmd_val(pmd) |= _PAGE_SILENT_WRITE;

        return pmd;
}

static inline int pmd_dirty(pmd_t pmd)
{
        return !!(pmd_val(pmd) & _PAGE_MODIFIED);
}

static inline pmd_t pmd_mkclean(pmd_t pmd)
{
        pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
        return pmd;
}

static inline pmd_t pmd_mkdirty(pmd_t pmd)
{
        pmd_val(pmd) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY;
        if (pmd_val(pmd) & _PAGE_WRITE)
                pmd_val(pmd) |= _PAGE_SILENT_WRITE;

        return pmd;
}

static inline int pmd_young(pmd_t pmd)
{
        return !!(pmd_val(pmd) & _PAGE_ACCESSED);
}

static inline pmd_t pmd_mkold(pmd_t pmd)
{
        pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);

        return pmd;
}

static inline pmd_t pmd_mkyoung(pmd_t pmd)
{
        pmd_val(pmd) |= _PAGE_ACCESSED;

        if (!(pmd_val(pmd) & _PAGE_NO_READ))
                pmd_val(pmd) |= _PAGE_SILENT_READ;

        return pmd;
}

#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
static inline int pmd_soft_dirty(pmd_t pmd)
{
        return !!(pmd_val(pmd) & _PAGE_SOFT_DIRTY);
}

static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
{
        pmd_val(pmd) |= _PAGE_SOFT_DIRTY;
        return pmd;
}

static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
{
        pmd_val(pmd) &= ~(_PAGE_SOFT_DIRTY);
        return pmd;
}

#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */

/* Extern to avoid header file madness */
extern pmd_t mk_pmd(struct page *page, pgprot_t prot);

static inline unsigned long pmd_pfn(pmd_t pmd)
{
        return pmd_val(pmd) >> _PFN_SHIFT;
}

static inline struct page *pmd_page(pmd_t pmd)
{
        if (pmd_trans_huge(pmd))
                return pfn_to_page(pmd_pfn(pmd));

        return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
}

static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
{
        pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) |
                       (pgprot_val(newprot) & ~_PAGE_CHG_MASK);
        return pmd;
}

static inline pmd_t pmd_mkinvalid(pmd_t pmd)
{
        pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);

        return pmd;
}

/*
 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
 * different prototype.
 */
#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
                                            unsigned long address, pmd_t *pmdp)
{
        pmd_t old = *pmdp;

        pmd_clear(pmdp);

        return old;
}

#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#ifdef _PAGE_HUGE
#define pmd_leaf(pmd)   ((pmd_val(pmd) & _PAGE_HUGE) != 0)
#define pud_leaf(pud)   ((pud_val(pud) & _PAGE_HUGE) != 0)
#endif

#define gup_fast_permitted(start, end)  (!cpu_has_dc_aliases)

/*
 * We provide our own get_unmapped area to cope with the virtual aliasing
 * constraints placed on us by the cache architecture.
 */
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN

#endif /* _ASM_PGTABLE_H */