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//lib/modules/2.6.32-754.el6.x86_64/build/include/asm-generic/pgtable.h

#ifndef _ASM_GENERIC_PGTABLE_H
#define _ASM_GENERIC_PGTABLE_H

#ifndef __ASSEMBLY__
#ifdef CONFIG_MMU

#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
/*
 * Largely same as above, but only sets the access flags (dirty,
 * accessed, and writable). Furthermore, we know it always gets set
 * to a "more permissive" setting, which allows most architectures
 * to optimize this. We return whether the PTE actually changed, which
 * in turn instructs the caller to do things like update__mmu_cache.
 * This used to be done in the caller, but sparc needs minor faults to
 * force that call on sun4c so we changed this macro slightly
 */
#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
({									  \
	int __changed = !pte_same(*(__ptep), __entry);			  \
	if (__changed) {						  \
		set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
		flush_tlb_page(__vma, __address);			  \
	}								  \
	__changed;							  \
})
#endif

#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define pmdp_set_access_flags(__vma, __address, __pmdp, __entry, __dirty) \
	({								\
		int __changed = !pmd_same(*(__pmdp), __entry);		\
		VM_BUG_ON((__address) & ~HPAGE_PMD_MASK);		\
		if (__changed) {					\
			set_pmd_at((__vma)->vm_mm, __address, __pmdp,	\
				   __entry);				\
			flush_tlb_range(__vma, __address,		\
					(__address) + HPAGE_PMD_SIZE);	\
		}							\
		__changed;						\
	})
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define pmdp_set_access_flags(__vma, __address, __pmdp, __entry, __dirty) \
	({ BUG(); 0; })
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define ptep_test_and_clear_young(__vma, __address, __ptep)		\
({									\
	pte_t __pte = *(__ptep);					\
	int r = 1;							\
	if (!pte_young(__pte))						\
		r = 0;							\
	else								\
		set_pte_at((__vma)->vm_mm, (__address),			\
			   (__ptep), pte_mkold(__pte));			\
	r;								\
})
#endif

#ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define pmdp_test_and_clear_young(__vma, __address, __pmdp)		\
({									\
	pmd_t __pmd = *(__pmdp);					\
	int r = 1;							\
	if (!pmd_young(__pmd))						\
		r = 0;							\
	else								\
		set_pmd_at((__vma)->vm_mm, (__address),			\
			   (__pmdp), pmd_mkold(__pmd));			\
	r;								\
})
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define pmdp_test_and_clear_young(__vma, __address, __pmdp)	\
	({ BUG(); 0; })
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
#define ptep_clear_flush_young(__vma, __address, __ptep)		\
({									\
	int __young;							\
	__young = ptep_test_and_clear_young(__vma, __address, __ptep);	\
	if (__young)							\
		flush_tlb_page(__vma, __address);			\
	__young;							\
})
#endif

#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define pmdp_clear_flush_young(__vma, __address, __pmdp)		\
({									\
	int __young;							\
	VM_BUG_ON((__address) & ~HPAGE_PMD_MASK);			\
	__young = pmdp_test_and_clear_young(__vma, __address, __pmdp);	\
	if (__young)							\
		flush_tlb_range(__vma, __address,			\
				(__address) + HPAGE_PMD_SIZE);		\
	__young;							\
})
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define pmdp_clear_flush_young(__vma, __address, __pmdp)	\
	({ BUG(); 0; })
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
#define ptep_get_and_clear(__mm, __address, __ptep)			\
({									\
	pte_t __pte = *(__ptep);					\
	pte_clear((__mm), (__address), (__ptep));			\
	__pte;								\
})
#endif

#ifndef __HAVE_ARCH_PMDP_GET_AND_CLEAR
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define pmdp_get_and_clear(__mm, __address, __pmdp)			\
({									\
	pmd_t __pmd = *(__pmdp);					\
	pmd_clear((__mm), (__address), (__pmdp));			\
	__pmd;								\
})
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define pmdp_get_and_clear(__mm, __address, __pmdp)	\
	({ BUG(); 0; })
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
#define ptep_get_and_clear_full(__mm, __address, __ptep, __full)	\
({									\
	pte_t __pte;							\
	__pte = ptep_get_and_clear((__mm), (__address), (__ptep));	\
	__pte;								\
})
#endif

/*
 * Some architectures may be able to avoid expensive synchronization
 * primitives when modifications are made to PTE's which are already
 * not present, or in the process of an address space destruction.
 */
#ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL
#define pte_clear_not_present_full(__mm, __address, __ptep, __full)	\
do {									\
	pte_clear((__mm), (__address), (__ptep));			\
} while (0)
#endif

#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
#define ptep_clear_flush(__vma, __address, __ptep)			\
({									\
	pte_t __pte;							\
	__pte = ptep_get_and_clear((__vma)->vm_mm, __address, __ptep);	\
	flush_tlb_page(__vma, __address);				\
	__pte;								\
})
#endif

#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define pmdp_clear_flush(__vma, __address, __pmdp)			\
({									\
	pmd_t __pmd;							\
	VM_BUG_ON((__address) & ~HPAGE_PMD_MASK);			\
	__pmd = pmdp_get_and_clear((__vma)->vm_mm, __address, __pmdp);	\
	flush_tlb_range(__vma, __address, (__address) + HPAGE_PMD_SIZE);\
	__pmd;								\
})
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define pmdp_clear_flush(__vma, __address, __pmdp)	\
	({ BUG(); 0; })
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
struct mm_struct;
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
{
	pte_t old_pte = *ptep;
	set_pte_at(mm, address, ptep, pte_wrprotect(old_pte));
}
#endif

#ifndef __HAVE_ARCH_PMDP_SET_WRPROTECT
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline void pmdp_set_wrprotect(struct mm_struct *mm, unsigned long address, pmd_t *pmdp)
{
	pmd_t old_pmd = *pmdp;
	set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd));
}
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define pmdp_set_wrprotect(mm, address, pmdp) BUG()
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define pmdp_splitting_flush(__vma, __address, __pmdp)			\
({									\
	pmd_t __pmd = pmd_mksplitting(*(__pmdp));			\
	VM_BUG_ON((__address) & ~HPAGE_PMD_MASK);			\
	set_pmd_at((__vma)->vm_mm, __address, __pmdp, __pmd);		\
	/* tlb flush only to serialize against gup-fast */		\
	flush_tlb_range(__vma, __address, (__address) + HPAGE_PMD_SIZE);\
})
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define pmdp_splitting_flush(__vma, __address, __pmdp) BUG()
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PTE_SAME
#define pte_same(A,B)	(pte_val(A) == pte_val(B))
#endif

#ifndef __HAVE_ARCH_PMD_SAME
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define pmd_same(A,B)	(pmd_val(A) == pmd_val(B))
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define pmd_same(A,B)	({ BUG(); 0; })
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PAGE_TEST_DIRTY
#define page_test_dirty(page)		(0)
#endif

#ifndef __HAVE_ARCH_PAGE_CLEAR_DIRTY
#define page_clear_dirty(page)		do { } while (0)
#endif

#ifndef __HAVE_ARCH_PAGE_TEST_DIRTY
#define pte_maybe_dirty(pte)		pte_dirty(pte)
#else
#define pte_maybe_dirty(pte)		(1)
#endif

#ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
#define page_test_and_clear_young(page) (0)
#endif

#ifndef __HAVE_ARCH_PGD_OFFSET_GATE
#define pgd_offset_gate(mm, addr)	pgd_offset(mm, addr)
#endif

#ifndef __HAVE_ARCH_MOVE_PTE
#define move_pte(pte, prot, old_addr, new_addr)	(pte)
#endif

#ifndef pgprot_noncached
#define pgprot_noncached(prot)	(prot)
#endif

#ifndef pgprot_writecombine
#define pgprot_writecombine pgprot_noncached
#endif

/*
 * When walking page tables, get the address of the next boundary,
 * or the end address of the range if that comes earlier.  Although no
 * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout.
 */

#define pgd_addr_end(addr, end)						\
({	unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK;	\
	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
})

#ifndef pud_addr_end
#define pud_addr_end(addr, end)						\
({	unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK;	\
	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
})
#endif

#ifndef pmd_addr_end
#define pmd_addr_end(addr, end)						\
({	unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK;	\
	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
})
#endif

/*
 * When walking page tables, we usually want to skip any p?d_none entries;
 * and any p?d_bad entries - reporting the error before resetting to none.
 * Do the tests inline, but report and clear the bad entry in mm/memory.c.
 */
void pgd_clear_bad(pgd_t *);
void pud_clear_bad(pud_t *);
void pmd_clear_bad(pmd_t *);

static inline int pgd_none_or_clear_bad(pgd_t *pgd)
{
	if (pgd_none(*pgd))
		return 1;
	if (unlikely(pgd_bad(*pgd))) {
		pgd_clear_bad(pgd);
		return 1;
	}
	return 0;
}

static inline int pud_none_or_clear_bad(pud_t *pud)
{
	if (pud_none(*pud))
		return 1;
	if (unlikely(pud_bad(*pud))) {
		pud_clear_bad(pud);
		return 1;
	}
	return 0;
}

static inline int pmd_none_or_clear_bad(pmd_t *pmd)
{
	if (pmd_none(*pmd))
		return 1;
	if (unlikely(pmd_bad(*pmd))) {
		pmd_clear_bad(pmd);
		return 1;
	}
	return 0;
}

static inline pte_t __ptep_modify_prot_start(struct mm_struct *mm,
					     unsigned long addr,
					     pte_t *ptep)
{
	/*
	 * Get the current pte state, but zero it out to make it
	 * non-present, preventing the hardware from asynchronously
	 * updating it.
	 */
	return ptep_get_and_clear(mm, addr, ptep);
}

static inline void __ptep_modify_prot_commit(struct mm_struct *mm,
					     unsigned long addr,
					     pte_t *ptep, pte_t pte)
{
	/*
	 * The pte is non-present, so there's no hardware state to
	 * preserve.
	 */
#ifdef CONFIG_PARAVIRT
	if (likely(!paravirt_enabled()))
		native_set_pte_at(mm, addr, ptep, pte);
	else
#endif
		set_pte_at(mm, addr, ptep, pte);
}

#ifndef __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
/*
 * Start a pte protection read-modify-write transaction, which
 * protects against asynchronous hardware modifications to the pte.
 * The intention is not to prevent the hardware from making pte
 * updates, but to prevent any updates it may make from being lost.
 *
 * This does not protect against other software modifications of the
 * pte; the appropriate pte lock must be held over the transation.
 *
 * Note that this interface is intended to be batchable, meaning that
 * ptep_modify_prot_commit may not actually update the pte, but merely
 * queue the update to be done at some later time.  The update must be
 * actually committed before the pte lock is released, however.
 */
static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
					   unsigned long addr,
					   pte_t *ptep)
{
	return __ptep_modify_prot_start(mm, addr, ptep);
}

/*
 * Commit an update to a pte, leaving any hardware-controlled bits in
 * the PTE unmodified.
 */
static inline void ptep_modify_prot_commit(struct mm_struct *mm,
					   unsigned long addr,
					   pte_t *ptep, pte_t pte)
{
	__ptep_modify_prot_commit(mm, addr, ptep, pte);
}
#endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */
#endif /* CONFIG_MMU */

/*
 * A facility to provide lazy MMU batching.  This allows PTE updates and
 * page invalidations to be delayed until a call to leave lazy MMU mode
 * is issued.  Some architectures may benefit from doing this, and it is
 * beneficial for both shadow and direct mode hypervisors, which may batch
 * the PTE updates which happen during this window.  Note that using this
 * interface requires that read hazards be removed from the code.  A read
 * hazard could result in the direct mode hypervisor case, since the actual
 * write to the page tables may not yet have taken place, so reads though
 * a raw PTE pointer after it has been modified are not guaranteed to be
 * up to date.  This mode can only be entered and left under the protection of
 * the page table locks for all page tables which may be modified.  In the UP
 * case, this is required so that preemption is disabled, and in the SMP case,
 * it must synchronize the delayed page table writes properly on other CPUs.
 */
#ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE
#define arch_enter_lazy_mmu_mode()	do {} while (0)
#define arch_leave_lazy_mmu_mode()	do {} while (0)
#define arch_flush_lazy_mmu_mode()	do {} while (0)
#endif

/*
 * A facility to provide batching of the reload of page tables and
 * other process state with the actual context switch code for
 * paravirtualized guests.  By convention, only one of the batched
 * update (lazy) modes (CPU, MMU) should be active at any given time,
 * entry should never be nested, and entry and exits should always be
 * paired.  This is for sanity of maintaining and reasoning about the
 * kernel code.  In this case, the exit (end of the context switch) is
 * in architecture-specific code, and so doesn't need a generic
 * definition.
 */
#ifndef __HAVE_ARCH_START_CONTEXT_SWITCH
#define arch_start_context_switch(prev)	do {} while (0)
#endif

#ifndef __HAVE_PFNMAP_TRACKING
/*
 * Interface that can be used by architecture code to keep track of
 * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn)
 *
 * track_pfn_vma_new is called when a _new_ pfn mapping is being established
 * for physical range indicated by pfn and size.
 */
static inline int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot,
					unsigned long pfn, unsigned long size)
{
	return 0;
}

/*
 * Interface that can be used by architecture code to keep track of
 * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn)
 *
 * track_pfn_vma_copy is called when vma that is covering the pfnmap gets
 * copied through copy_page_range().
 */
static inline int track_pfn_vma_copy(struct vm_area_struct *vma)
{
	return 0;
}

/*
 * Interface that can be used by architecture code to keep track of
 * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn)
 *
 * untrack_pfn_vma is called while unmapping a pfnmap for a region.
 * untrack can be called for a specific region indicated by pfn and size or
 * can be for the entire vma (in which case size can be zero).
 */
static inline void untrack_pfn_vma(struct vm_area_struct *vma,
					unsigned long pfn, unsigned long size)
{
}
#else
extern int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot,
				unsigned long pfn, unsigned long size);
extern int track_pfn_vma_copy(struct vm_area_struct *vma);
extern void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn,
				unsigned long size);
#endif

#ifdef __HAVE_COLOR_ZERO_PAGE
static inline int is_zero_pfn(unsigned long pfn)
{
	extern unsigned long zero_pfn;
	unsigned long offset_from_zero_pfn = pfn - zero_pfn;
	return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
}

static inline unsigned long my_zero_pfn(unsigned long addr)
{
	return page_to_pfn(ZERO_PAGE(addr));
}
#else
static inline int is_zero_pfn(unsigned long pfn)
{
	extern unsigned long zero_pfn;
	return pfn == zero_pfn;
}

static inline unsigned long my_zero_pfn(unsigned long addr)
{
	extern unsigned long zero_pfn;
	return zero_pfn;
}
#endif

#ifndef CONFIG_TRANSPARENT_HUGEPAGE
#define pmd_trans_huge(pmd) 0
#define pmd_trans_splitting(pmd) (0)
#ifndef __HAVE_ARCH_PMD_WRITE
#define pmd_write(pmd)	({ BUG(); 0; })
#endif /* __HAVE_ARCH_PMD_WRITE */
#endif

#ifndef  __HAVE_ARCH_READ_PMD_ATOMIC
static inline pmd_t read_pmd_atomic(pmd_t *pmdp)
{
	/*
	 * Depend on compiler for an atomic pmd read. NOTE: this is
	 * only going to work, if the pmdval_t isn't larger than
	 * an unsigned long.
	 */
	return *pmdp;
}
#endif /* __HAVE_ARCH_READ_PMD */

/*
 * This function is meant to be used by sites walking pagetables with
 * the mmap_sem hold in read mode to protect against MADV_DONTNEED and
 * transhuge page faults. MADV_DONTNEED can convert a transhuge pmd
 * into a null pmd and the transhuge page fault can convert a null pmd
 * into an hugepmd or into a regular pmd (if the hugepage allocation
 * fails). While holding the mmap_sem in read mode the pmd becomes
 * stable and stops changing under us only if it's not null and not a
 * transhuge pmd. When those races occurs and this function makes a
 * difference vs the standard pmd_none_or_clear_bad, the result is
 * undefined so behaving like if the pmd was none is safe (because it
 * can return none anyway). The compiler level barrier() is critically
 * important to compute the two checks atomically on the same pmdval.
 *
 * For 32bit kernels with a 64bit large pmd_t this automatically takes
 * care of reading the pmd atomically to avoid SMP race conditions
 * against pmd_populate() when the mmap_sem is hold for reading by the
 * caller (a special atomic read not done by "gcc" as in the generic
 * version above, is also needed when THP is disabled because the page
 * fault can populate the pmd from under us).
 */
static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd)
{
	pmd_t pmdval = read_pmd_atomic(pmd);
	/*
	 * The barrier will stabilize the pmdval in a register or on
	 * the stack so that it will stop changing under the code.
	 */
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	barrier();
#endif
	if (pmd_none(pmdval))
		return 1;
	if (unlikely(pmd_bad(pmdval))) {
		if (!pmd_trans_huge(pmdval))
			pmd_clear_bad(pmd);
		return 1;
	}
	return 0;
}

/*
 * This is a noop if Transparent Hugepage Support is not built into
 * the kernel. Otherwise it is equivalent to
 * pmd_none_or_trans_huge_or_clear_bad(), and shall only be called in
 * places that already verified the pmd is not none and they want to
 * walk ptes while holding the mmap sem in read mode (write mode don't
 * need this). If THP is not enabled, the pmd can't go away under the
 * code even if MADV_DONTNEED runs, but if THP is enabled we need to
 * run a pmd_trans_unstable before walking the ptes after
 * split_huge_page_pmd returns (because it may have run when the pmd
 * become null, but then a page fault can map in a THP and not a
 * regular page).
 */
static inline int pmd_trans_unstable(pmd_t *pmd)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	return pmd_none_or_trans_huge_or_clear_bad(pmd);
#else
	return 0;
#endif
}

#endif /* !__ASSEMBLY__ */

#endif /* _ASM_GENERIC_PGTABLE_H */

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