LXR linux/arch/ia64/include/asm/page.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_IA64_PAGE_H
   3#define _ASM_IA64_PAGE_H
   4/*
   5 * Pagetable related stuff.
   6 *
   7 * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
   8 *      David Mosberger-Tang <davidm@hpl.hp.com>
   9 */
  10
  11#include <asm/intrinsics.h>
  12#include <asm/types.h>
  13
  14/*
  15 * The top three bits of an IA64 address are its Region Number.
  16 * Different regions are assigned to different purposes.
  17 */
  18#define RGN_SHIFT       (61)
  19#define RGN_BASE(r)     (__IA64_UL_CONST(r)<<RGN_SHIFT)
  20#define RGN_BITS        (RGN_BASE(-1))
  21
  22#define RGN_KERNEL      7       /* Identity mapped region */
  23#define RGN_UNCACHED    6       /* Identity mapped I/O region */
  24#define RGN_GATE        5       /* Gate page, Kernel text, etc */
  25#define RGN_HPAGE       4       /* For Huge TLB pages */
  26
  27/*
  28 * PAGE_SHIFT determines the actual kernel page size.
  29 */
  30#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
  31# define PAGE_SHIFT     12
  32#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
  33# define PAGE_SHIFT     13
  34#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
  35# define PAGE_SHIFT     14
  36#elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
  37# define PAGE_SHIFT     16
  38#else
  39# error Unsupported page size!
  40#endif
  41
  42#define PAGE_SIZE               (__IA64_UL_CONST(1) << PAGE_SHIFT)
  43#define PAGE_MASK               (~(PAGE_SIZE - 1))
  44
  45#define PERCPU_PAGE_SHIFT       18      /* log2() of max. size of per-CPU area */
  46#define PERCPU_PAGE_SIZE        (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
  47
  48
  49#ifdef CONFIG_HUGETLB_PAGE
  50# define HPAGE_REGION_BASE      RGN_BASE(RGN_HPAGE)
  51# define HPAGE_SHIFT            hpage_shift
  52# define HPAGE_SHIFT_DEFAULT    28      /* check ia64 SDM for architecture supported size */
  53# define HPAGE_SIZE             (__IA64_UL_CONST(1) << HPAGE_SHIFT)
  54# define HPAGE_MASK             (~(HPAGE_SIZE - 1))
  55
  56# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  57#endif /* CONFIG_HUGETLB_PAGE */
  58
  59#ifdef __ASSEMBLY__
  60# define __pa(x)                ((x) - PAGE_OFFSET)
  61# define __va(x)                ((x) + PAGE_OFFSET)
  62#else /* !__ASSEMBLY */
  63#  define STRICT_MM_TYPECHECKS
  64
  65extern void clear_page (void *page);
  66extern void copy_page (void *to, void *from);
  67
  68/*
  69 * clear_user_page() and copy_user_page() can't be inline functions because
  70 * flush_dcache_page() can't be defined until later...
  71 */
  72#define clear_user_page(addr, vaddr, page)      \
  73do {                                            \
  74        clear_page(addr);                       \
  75        flush_dcache_page(page);                \
  76} while (0)
  77
  78#define copy_user_page(to, from, vaddr, page)   \
  79do {                                            \
  80        copy_page((to), (from));                \
  81        flush_dcache_page(page);                \
  82} while (0)
  83
  84
  85#define alloc_zeroed_user_highpage_movable(vma, vaddr)                  \
  86({                                                                      \
  87        struct page *page = alloc_page_vma(                             \
  88                GFP_HIGHUSER_MOVABLE | __GFP_ZERO, vma, vaddr);         \
  89        if (page)                                                       \
  90                flush_dcache_page(page);                                \
  91        page;                                                           \
  92})
  93
  94#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE_MOVABLE
  95
  96#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  97
  98#include <asm-generic/memory_model.h>
  99
 100#ifdef CONFIG_FLATMEM
 101# define pfn_valid(pfn)         ((pfn) < max_mapnr)
 102#endif
 103
 104#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 105#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 106#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 107
 108typedef union ia64_va {
 109        struct {
 110                unsigned long off : 61;         /* intra-region offset */
 111                unsigned long reg :  3;         /* region number */
 112        } f;
 113        unsigned long l;
 114        void *p;
 115} ia64_va;
 116
 117/*
 118 * Note: These macros depend on the fact that PAGE_OFFSET has all
 119 * region bits set to 1 and all other bits set to zero.  They are
 120 * expressed in this way to ensure they result in a single "dep"
 121 * instruction.
 122 */
 123#define __pa(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
 124#define __va(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
 125
 126#define REGION_NUMBER(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
 127#define REGION_OFFSET(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
 128
 129#ifdef CONFIG_HUGETLB_PAGE
 130# define htlbpage_to_page(x)    (((unsigned long) REGION_NUMBER(x) << 61)                       \
 131                                 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
 132# define HUGETLB_PAGE_ORDER     (HPAGE_SHIFT - PAGE_SHIFT)
 133extern unsigned int hpage_shift;
 134#endif
 135
 136static __inline__ int
 137get_order (unsigned long size)
 138{
 139        long double d = size - 1;
 140        long order;
 141
 142        order = ia64_getf_exp(d);
 143        order = order - PAGE_SHIFT - 0xffff + 1;
 144        if (order < 0)
 145                order = 0;
 146        return order;
 147}
 148
 149#endif /* !__ASSEMBLY__ */
 150
 151#ifdef STRICT_MM_TYPECHECKS
 152  /*
 153   * These are used to make use of C type-checking..
 154   */
 155  typedef struct { unsigned long pte; } pte_t;
 156  typedef struct { unsigned long pmd; } pmd_t;
 157#if CONFIG_PGTABLE_LEVELS == 4
 158  typedef struct { unsigned long pud; } pud_t;
 159#endif
 160  typedef struct { unsigned long pgd; } pgd_t;
 161  typedef struct { unsigned long pgprot; } pgprot_t;
 162  typedef struct page *pgtable_t;
 163
 164# define pte_val(x)     ((x).pte)
 165# define pmd_val(x)     ((x).pmd)
 166#if CONFIG_PGTABLE_LEVELS == 4
 167# define pud_val(x)     ((x).pud)
 168#endif
 169# define pgd_val(x)     ((x).pgd)
 170# define pgprot_val(x)  ((x).pgprot)
 171
 172# define __pte(x)       ((pte_t) { (x) } )
 173# define __pmd(x)       ((pmd_t) { (x) } )
 174# define __pgprot(x)    ((pgprot_t) { (x) } )
 175
 176#else /* !STRICT_MM_TYPECHECKS */
 177  /*
 178   * .. while these make it easier on the compiler
 179   */
 180# ifndef __ASSEMBLY__
 181    typedef unsigned long pte_t;
 182    typedef unsigned long pmd_t;
 183    typedef unsigned long pgd_t;
 184    typedef unsigned long pgprot_t;
 185    typedef struct page *pgtable_t;
 186# endif
 187
 188# define pte_val(x)     (x)
 189# define pmd_val(x)     (x)
 190# define pgd_val(x)     (x)
 191# define pgprot_val(x)  (x)
 192
 193# define __pte(x)       (x)
 194# define __pgd(x)       (x)
 195# define __pgprot(x)    (x)
 196#endif /* !STRICT_MM_TYPECHECKS */
 197
 198#define PAGE_OFFSET                     RGN_BASE(RGN_KERNEL)
 199
 200#define VM_DATA_DEFAULT_FLAGS   VM_DATA_FLAGS_TSK_EXEC
 201
 202#define GATE_ADDR               RGN_BASE(RGN_GATE)
 203
 204/*
 205 * 0xa000000000000000+2*PERCPU_PAGE_SIZE
 206 * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page)
 207 */
 208#define KERNEL_START             (GATE_ADDR+__IA64_UL_CONST(0x100000000))
 209#define PERCPU_ADDR             (-PERCPU_PAGE_SIZE)
 210#define LOAD_OFFSET             (KERNEL_START - KERNEL_TR_PAGE_SIZE)
 211
 212#define __HAVE_ARCH_GATE_AREA   1
 213
 214#endif /* _ASM_IA64_PAGE_H */
 215