include/asm-ia64/page.h - kernel/msm-4.9 - Gitiles

 #ifndef _ASM_IA64_PAGE_H
 #define _ASM_IA64_PAGE_H
 /*
  * Pagetable related stuff.
  *
  * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
  *	David Mosberger-Tang <davidm@hpl.hp.com>
  */

 # ifdef __KERNEL__

 #include <asm/intrinsics.h>
 #include <asm/types.h>

 /*
  * The top three bits of an IA64 address are its Region Number.
  * Different regions are assigned to different purposes.
  */
 #define RGN_SHIFT	(61)
 #define RGN_BASE(r)	(__IA64_UL_CONST(r)<<RGN_SHIFT)
 #define RGN_BITS	(RGN_BASE(-1))

 #define RGN_KERNEL	7	/* Identity mapped region */
 #define RGN_UNCACHED    6	/* Identity mapped I/O region */
 #define RGN_GATE	5	/* Gate page, Kernel text, etc */
 #define RGN_HPAGE	4	/* For Huge TLB pages */

 /*
  * PAGE_SHIFT determines the actual kernel page size.
  */
 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
 # define PAGE_SHIFT	12
 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
 # define PAGE_SHIFT	13
 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
 # define PAGE_SHIFT	14
 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
 # define PAGE_SHIFT	16
 #else
 # error Unsupported page size!
 #endif

 #define PAGE_SIZE		(__IA64_UL_CONST(1) << PAGE_SHIFT)
 #define PAGE_MASK		(~(PAGE_SIZE - 1))
 #define PAGE_ALIGN(addr)	(((addr) + PAGE_SIZE - 1) & PAGE_MASK)

 #define PERCPU_PAGE_SHIFT	16	/* log2() of max. size of per-CPU area */
 #define PERCPU_PAGE_SIZE	(__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)


 #ifdef CONFIG_HUGETLB_PAGE
 # define HPAGE_REGION_BASE	RGN_BASE(RGN_HPAGE)
 # define HPAGE_SHIFT		hpage_shift
 # define HPAGE_SHIFT_DEFAULT	28	/* check ia64 SDM for architecture supported size */
 # define HPAGE_SIZE		(__IA64_UL_CONST(1) << HPAGE_SHIFT)
 # define HPAGE_MASK		(~(HPAGE_SIZE - 1))

 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 # define ARCH_HAS_HUGEPAGE_ONLY_RANGE
 # define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
 # define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
 #endif /* CONFIG_HUGETLB_PAGE */

 #ifdef __ASSEMBLY__
 # define __pa(x)		((x) - PAGE_OFFSET)
 # define __va(x)		((x) + PAGE_OFFSET)
 #else /* !__ASSEMBLY */
 #  define STRICT_MM_TYPECHECKS

 extern void clear_page (void *page);
 extern void copy_page (void *to, void *from);

 /*
  * clear_user_page() and copy_user_page() can't be inline functions because
  * flush_dcache_page() can't be defined until later...
  */
 #define clear_user_page(addr, vaddr, page)	\
 do {						\
 	clear_page(addr);			\
 	flush_dcache_page(page);		\
 } while (0)

 #define copy_user_page(to, from, vaddr, page)	\
 do {						\
 	copy_page((to), (from));		\
 	flush_dcache_page(page);		\
 } while (0)


 #define alloc_zeroed_user_highpage(vma, vaddr) \
 ({						\
 	struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr); \
 	if (page)				\
  		flush_dcache_page(page);	\
 	page;					\
 })

 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE

 #define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

 #ifdef CONFIG_VIRTUAL_MEM_MAP
 extern int ia64_pfn_valid (unsigned long pfn);
 #else
 # define ia64_pfn_valid(pfn) 1
 #endif

 #ifdef CONFIG_VIRTUAL_MEM_MAP
 extern struct page *vmem_map;
 #ifdef CONFIG_DISCONTIGMEM
 # define page_to_pfn(page)	((unsigned long) (page - vmem_map))
 # define pfn_to_page(pfn)	(vmem_map + (pfn))
 #else
 # include <asm-generic/memory_model.h>
 #endif
 #else
 # include <asm-generic/memory_model.h>
 #endif

 #ifdef CONFIG_FLATMEM
 # define pfn_valid(pfn)		(((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
 #elif defined(CONFIG_DISCONTIGMEM)
 extern unsigned long min_low_pfn;
 extern unsigned long max_low_pfn;
 # define pfn_valid(pfn)		(((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
 #endif

 #define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
 #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 #define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

 typedef union ia64_va {
 	struct {
 		unsigned long off : 61;		/* intra-region offset */
 		unsigned long reg :  3;		/* region number */
 	} f;
 	unsigned long l;
 	void *p;
 } ia64_va;

 /*
  * Note: These macros depend on the fact that PAGE_OFFSET has all
  * region bits set to 1 and all other bits set to zero.  They are
  * expressed in this way to ensure they result in a single "dep"
  * instruction.
  */
 #define __pa(x)		({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
 #define __va(x)		({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})

 #define REGION_NUMBER(x)	({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
 #define REGION_OFFSET(x)	({ia64_va _v; _v.l = (long) (x); _v.f.off;})

 #ifdef CONFIG_HUGETLB_PAGE
 # define htlbpage_to_page(x)	(((unsigned long) REGION_NUMBER(x) << 61)			\
 				 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
 # define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
 # define is_hugepage_only_range(mm, addr, len)		\
 	 (REGION_NUMBER(addr) == RGN_HPAGE ||	\
 	  REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
 extern unsigned int hpage_shift;
 #endif

 static __inline__ int
 get_order (unsigned long size)
 {
 	long double d = size - 1;
 	long order;

 	order = ia64_getf_exp(d);
 	order = order - PAGE_SHIFT - 0xffff + 1;
 	if (order < 0)
 		order = 0;
 	return order;
 }

 #endif /* !__ASSEMBLY__ */

 #ifdef STRICT_MM_TYPECHECKS
   /*
    * These are used to make use of C type-checking..
    */
   typedef struct { unsigned long pte; } pte_t;
   typedef struct { unsigned long pmd; } pmd_t;
 #ifdef CONFIG_PGTABLE_4
   typedef struct { unsigned long pud; } pud_t;
 #endif
   typedef struct { unsigned long pgd; } pgd_t;
   typedef struct { unsigned long pgprot; } pgprot_t;

 # define pte_val(x)	((x).pte)
 # define pmd_val(x)	((x).pmd)
 #ifdef CONFIG_PGTABLE_4
 # define pud_val(x)	((x).pud)
 #endif
 # define pgd_val(x)	((x).pgd)
 # define pgprot_val(x)	((x).pgprot)

 # define __pte(x)	((pte_t) { (x) } )
 # define __pgprot(x)	((pgprot_t) { (x) } )

 #else /* !STRICT_MM_TYPECHECKS */
   /*
    * .. while these make it easier on the compiler
    */
 # ifndef __ASSEMBLY__
     typedef unsigned long pte_t;
     typedef unsigned long pmd_t;
     typedef unsigned long pgd_t;
     typedef unsigned long pgprot_t;
 # endif

 # define pte_val(x)	(x)
 # define pmd_val(x)	(x)
 # define pgd_val(x)	(x)
 # define pgprot_val(x)	(x)

 # define __pte(x)	(x)
 # define __pgd(x)	(x)
 # define __pgprot(x)	(x)
 #endif /* !STRICT_MM_TYPECHECKS */

 #define PAGE_OFFSET			RGN_BASE(RGN_KERNEL)

 #define VM_DATA_DEFAULT_FLAGS		(VM_READ | VM_WRITE |					\
 					 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |		\
 					 (((current->personality & READ_IMPLIES_EXEC) != 0)	\
 					  ? VM_EXEC : 0))

 # endif /* __KERNEL__ */
 #endif /* _ASM_IA64_PAGE_H */
	#ifndef _ASM_IA64_PAGE_H
	#define _ASM_IA64_PAGE_H
	/*
	* Pagetable related stuff.
	*
	* Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
	* David Mosberger-Tang <davidm@hpl.hp.com>
	*/

	# ifdef __KERNEL__

	#include <asm/intrinsics.h>
	#include <asm/types.h>

	/*
	* The top three bits of an IA64 address are its Region Number.
	* Different regions are assigned to different purposes.
	*/
	#define RGN_SHIFT (61)
	#define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT)
	#define RGN_BITS (RGN_BASE(-1))

	#define RGN_KERNEL 7 /* Identity mapped region */
	#define RGN_UNCACHED 6 /* Identity mapped I/O region */
	#define RGN_GATE 5 /* Gate page, Kernel text, etc */
	#define RGN_HPAGE 4 /* For Huge TLB pages */

	/*
	* PAGE_SHIFT determines the actual kernel page size.
	*/
	#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
	# define PAGE_SHIFT 12
	#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
	# define PAGE_SHIFT 13
	#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
	# define PAGE_SHIFT 14
	#elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
	# define PAGE_SHIFT 16
	#else
	# error Unsupported page size!
	#endif

	#define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
	#define PAGE_MASK (~(PAGE_SIZE - 1))
	#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)

	#define PERCPU_PAGE_SHIFT 16 /* log2() of max. size of per-CPU area */
	#define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)


	#ifdef CONFIG_HUGETLB_PAGE
	# define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE)
	# define HPAGE_SHIFT hpage_shift
	# define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */
	# define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT)
	# define HPAGE_MASK (~(HPAGE_SIZE - 1))

	# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	# define ARCH_HAS_HUGEPAGE_ONLY_RANGE
	# define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
	# define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
	#endif /* CONFIG_HUGETLB_PAGE */

	#ifdef __ASSEMBLY__
	# define __pa(x) ((x) - PAGE_OFFSET)
	# define __va(x) ((x) + PAGE_OFFSET)
	#else /* !__ASSEMBLY */
	# define STRICT_MM_TYPECHECKS

	extern void clear_page (void *page);
	extern void copy_page (void to, void from);

	/*
	* clear_user_page() and copy_user_page() can't be inline functions because
	* flush_dcache_page() can't be defined until later...
	*/
	#define clear_user_page(addr, vaddr, page) \
	do { \
	clear_page(addr); \
	flush_dcache_page(page); \
	} while (0)

	#define copy_user_page(to, from, vaddr, page) \
	do { \
	copy_page((to), (from)); \
	flush_dcache_page(page); \
	} while (0)


	#define alloc_zeroed_user_highpage(vma, vaddr) \
	({ \
	struct page *page = alloc_page_vma(GFP_HIGHUSER \| __GFP_ZERO, vma, vaddr); \
	if (page) \
	flush_dcache_page(page); \
	page; \
	})

	#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE

	#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

	#ifdef CONFIG_VIRTUAL_MEM_MAP
	extern int ia64_pfn_valid (unsigned long pfn);
	#else
	# define ia64_pfn_valid(pfn) 1
	#endif

	#ifdef CONFIG_VIRTUAL_MEM_MAP
	extern struct page *vmem_map;
	#ifdef CONFIG_DISCONTIGMEM
	# define page_to_pfn(page) ((unsigned long) (page - vmem_map))
	# define pfn_to_page(pfn) (vmem_map + (pfn))
	#else
	# include <asm-generic/memory_model.h>
	#endif
	#else
	# include <asm-generic/memory_model.h>
	#endif

	#ifdef CONFIG_FLATMEM
	# define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
	#elif defined(CONFIG_DISCONTIGMEM)
	extern unsigned long min_low_pfn;
	extern unsigned long max_low_pfn;
	# define pfn_valid(pfn) (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
	#endif

	#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
	#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)

	typedef union ia64_va {
	struct {
	unsigned long off : 61; /* intra-region offset */
	unsigned long reg : 3; /* region number */
	} f;
	unsigned long l;
	void *p;
	} ia64_va;

	/*
	* Note: These macros depend on the fact that PAGE_OFFSET has all
	* region bits set to 1 and all other bits set to zero. They are
	* expressed in this way to ensure they result in a single "dep"
	* instruction.
	*/
	#define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
	#define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})

	#define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
	#define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})

	#ifdef CONFIG_HUGETLB_PAGE
	# define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \
	\| (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
	# define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
	# define is_hugepage_only_range(mm, addr, len) \
	(REGION_NUMBER(addr) == RGN_HPAGE \|\| \
	REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
	extern unsigned int hpage_shift;
	#endif

	static __inline__ int
	get_order (unsigned long size)
	{
	long double d = size - 1;
	long order;

	order = ia64_getf_exp(d);
	order = order - PAGE_SHIFT - 0xffff + 1;
	if (order < 0)
	order = 0;
	return order;
	}

	#endif /* !__ASSEMBLY__ */

	#ifdef STRICT_MM_TYPECHECKS
	/*
	* These are used to make use of C type-checking..
	*/
	typedef struct { unsigned long pte; } pte_t;
	typedef struct { unsigned long pmd; } pmd_t;
	#ifdef CONFIG_PGTABLE_4
	typedef struct { unsigned long pud; } pud_t;
	#endif
	typedef struct { unsigned long pgd; } pgd_t;
	typedef struct { unsigned long pgprot; } pgprot_t;

	# define pte_val(x) ((x).pte)
	# define pmd_val(x) ((x).pmd)
	#ifdef CONFIG_PGTABLE_4
	# define pud_val(x) ((x).pud)
	#endif
	# define pgd_val(x) ((x).pgd)
	# define pgprot_val(x) ((x).pgprot)

	# define __pte(x) ((pte_t) { (x) } )
	# define __pgprot(x) ((pgprot_t) { (x) } )

	#else /* !STRICT_MM_TYPECHECKS */
	/*
	* .. while these make it easier on the compiler
	*/
	# ifndef __ASSEMBLY__
	typedef unsigned long pte_t;
	typedef unsigned long pmd_t;
	typedef unsigned long pgd_t;
	typedef unsigned long pgprot_t;
	# endif

	# define pte_val(x) (x)
	# define pmd_val(x) (x)
	# define pgd_val(x) (x)
	# define pgprot_val(x) (x)

	# define __pte(x) (x)
	# define __pgd(x) (x)
	# define __pgprot(x) (x)
	#endif /* !STRICT_MM_TYPECHECKS */

	#define PAGE_OFFSET RGN_BASE(RGN_KERNEL)

	#define VM_DATA_DEFAULT_FLAGS (VM_READ \| VM_WRITE \| \
	VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC \| \
	(((current->personality & READ_IMPLIES_EXEC) != 0) \
	? VM_EXEC : 0))

	# endif /* __KERNEL__ */
	#endif /* _ASM_IA64_PAGE_H */