text: /*
   * 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/io.h>
  #include <asm/pgtable-bits.h>
  
  struct mm_struct;
  struct vm_area_struct;
  
  #define PAGE_NONE	__pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
  #define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | (cpu_has_rixi ? 0 : _PAGE_READ) | \
  				 _page_cachable_default)
  #define PAGE_COPY	__pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \
  				 (cpu_has_rixi ?  _PAGE_NO_EXEC : 0) | _page_cachable_default)
  #define PAGE_READONLY	__pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \
  				 _page_cachable_default)
  #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_USERIO	__pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \
  				 _page_cachable_default)
  #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;
  
  /*
   * 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)
  
  
  extern void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
  	pte_t pteval);
  
  #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
  
  #define pte_none(pte)		(!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
  #define pte_present(pte)	((pte).pte_low & _PAGE_PRESENT)
  
  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;
  
  	if (pte.pte_low & _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 (pte_none(*buddy)) {
  			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 (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)
  
  /*
   * 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_R3000) && !defined(CONFIG_CPU_TX39XX)
  	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)
  		 */
  #ifdef CONFIG_SMP
  		/*
  		 * For SMP, multiple CPUs can race, so we need to do
  		 * this atomically.
  		 */
  #ifdef CONFIG_64BIT
  #define LL_INSN "lld"
  #define SC_INSN "scd"
  #else /* CONFIG_32BIT */
  #define LL_INSN "ll"
  #define SC_INSN "sc"
  #endif
  		unsigned long page_global = _PAGE_GLOBAL;
  		unsigned long tmp;
  
  		__asm__ __volatile__ (
  			"	.set	push\n"
  			"	.set	noreorder\n"
  			"1:	" LL_INSN "	%[tmp], %[buddy]\n"
  			"	bnez	%[tmp], 2f\n"
  			"	 or	%[tmp], %[tmp], %[global]\n"
  			"	" SC_INSN "	%[tmp], %[buddy]\n"
  			"	beqz	%[tmp], 1b\n"
  			"	 nop\n"
  			"2:\n"
  			"	.set pop"
  			: [buddy] "+m" (buddy->pte),
  			  [tmp] "=&r" (tmp)
  			: [global] "r" (page_global));
  #else /* !CONFIG_SMP */
  		if (pte_none(*buddy))
  			pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
  #endif /* CONFIG_SMP */
  	}
  #endif
  }
  
  static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
  {
  	htw_stop();
  #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
  	/* 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
  
  /*
   * (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[];
  
  /*
   * The following only work if pte_present() is true.
   * Undefined behaviour if not..
   */
  #if defined(CONFIG_64BIT_PHYS_ADDR) && 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 int pte_file(pte_t pte)	{ return pte.pte_low & _PAGE_FILE; }
  
  static inline pte_t pte_wrprotect(pte_t pte)
  {
  	pte.pte_low  &= ~(_PAGE_WRITE | _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 | _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 | _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) {
  		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) {
  		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_READ) {
  		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 int pte_file(pte_t pte)	{ return pte_val(pte) & _PAGE_FILE; }
  
  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;
  	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 (cpu_has_rixi) {
  		if (!(pte_val(pte) & _PAGE_NO_READ))
  			pte_val(pte) |= _PAGE_SILENT_READ;
  	} else {
  		if (pte_val(pte) & _PAGE_READ)
  			pte_val(pte) |= _PAGE_SILENT_READ;
  	}
  	return pte;
  }
  
  #ifdef _PAGE_HUGE
  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 /* _PAGE_HUGE */
  #endif
  static inline int pte_special(pte_t pte)	{ return 0; }
  static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
  
  /*
   * 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);
  }
  
  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);
  }
  
  /*
   * 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_64BIT_PHYS_ADDR) && 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 &= ~0x3f;
  	pte.pte_low  |= pgprot_val(newprot);
  	pte.pte_high |= pgprot_val(newprot) & 0x3f;
  	return pte;
  }
  #else
  static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
  {
  	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
  }
  #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);
  }
  
  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)
  
  #ifdef CONFIG_64BIT_PHYS_ADDR
  extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
  
  static inline int io_remap_pfn_range(struct vm_area_struct *vma,
  		unsigned long vaddr,
  		unsigned long pfn,
  		unsigned long size,
  		pgprot_t prot)
  {
  	phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
  	return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
  }
  #define io_remap_pfn_range io_remap_pfn_range
  #endif
  
  #ifdef CONFIG_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;
  }
  
  static inline int pmd_trans_splitting(pmd_t pmd)
  {
  	return !!(pmd_val(pmd) & _PAGE_SPLITTING);
  }
  
  static inline pmd_t pmd_mksplitting(pmd_t pmd)
  {
  	pmd_val(pmd) |= _PAGE_SPLITTING;
  
  	return pmd;
  }
  
  extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
  		       pmd_t *pmdp, pmd_t pmd);
  
  #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
  /* Extern to avoid header file madness */
  extern void pmdp_splitting_flush(struct vm_area_struct *vma,
  					unsigned long address,
  					pmd_t *pmdp);
  
  #define __HAVE_ARCH_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;
  	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 (cpu_has_rixi) {
  		if (!(pmd_val(pmd) & _PAGE_NO_READ))
  			pmd_val(pmd) |= _PAGE_SILENT_READ;
  	} else {
  		if (pmd_val(pmd) & _PAGE_READ)
  			pmd_val(pmd) |= _PAGE_SILENT_READ;
  	}
  
  	return pmd;
  }
  
  /* 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) | pgprot_val(newprot);
  	return pmd;
  }
  
  static inline pmd_t pmd_mknotpresent(pmd_t pmd)
  {
  	pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
  
  	return pmd;
  }
  
  /*
   * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a
   * different prototype.
   */
  #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
  static inline pmd_t pmdp_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 */
  
  #include <asm-generic/pgtable.h>
  
  /*
   * uncached accelerated TLB map for video memory access
   */
  #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
  #define __HAVE_PHYS_MEM_ACCESS_PROT
  
  struct file;
  pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
  		unsigned long size, pgprot_t vma_prot);
  int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
  		unsigned long size, pgprot_t *vma_prot);
  #endif
  
  /*
   * 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
  
  /*
   * No page table caches to initialise
   */
  #define pgtable_cache_init()	do { } while (0)
  
  #endif /* _ASM_PGTABLE_H */
  