include/asm-ppc64/page.h

   1 #ifndef _PPC64_PAGE_H
   2 #define _PPC64_PAGE_H
   3
   4 /*
   5  * Copyright (C) 2001 PPC64 Team, IBM Corp
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 #include <linux/config.h>
  14
  15 #ifdef __ASSEMBLY__
  16   #define ASM_CONST(x) x
  17 #else
  18   #define __ASM_CONST(x) x##UL
  19   #define ASM_CONST(x) __ASM_CONST(x)
  20 #endif
  21
  22 /* PAGE_SHIFT determines the page size */
  23 #define PAGE_SHIFT      12
  24 #define PAGE_SIZE       (ASM_CONST(1) << PAGE_SHIFT)
  25 #define PAGE_MASK       (~(PAGE_SIZE-1))
  26
  27 #define SID_SHIFT       28
  28 #define SID_MASK        0xfffffffffUL
  29 #define ESID_MASK       0xfffffffff0000000UL
  30 #define GET_ESID(x)     (((x) >> SID_SHIFT) & SID_MASK)
  31
  32 #define HPAGE_SHIFT     24
  33 #define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
  34 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  35
  36 #ifdef CONFIG_HUGETLB_PAGE
  37
  38 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  39
  40 #define HTLB_AREA_SHIFT         40
  41 #define HTLB_AREA_SIZE          (1UL << HTLB_AREA_SHIFT)
  42 #define GET_HTLB_AREA(x)        ((x) >> HTLB_AREA_SHIFT)
  43
  44 #define LOW_ESID_MASK(addr, len)        (((1U << (GET_ESID(addr+len-1)+1)) \
  45                                         - (1U << GET_ESID(addr))) & 0xffff)
  46 #define HTLB_AREA_MASK(addr, len)       (((1U << (GET_HTLB_AREA(addr+len-1)+1)) \
  47                                         - (1U << GET_HTLB_AREA(addr))) & 0xffff)
  48
  49 #define ARCH_HAS_HUGEPAGE_ONLY_RANGE
  50 #define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  51 #define ARCH_HAS_SETCLEAR_HUGE_PTE
  52
  53 #define touches_hugepage_low_range(mm, addr, len) \
  54         (LOW_ESID_MASK((addr), (len)) & (mm)->context.low_htlb_areas)
  55 #define touches_hugepage_high_range(mm, addr, len) \
  56         (HTLB_AREA_MASK((addr), (len)) & (mm)->context.high_htlb_areas)
  57
  58 #define __within_hugepage_low_range(addr, len, segmask) \
  59         ((LOW_ESID_MASK((addr), (len)) | (segmask)) == (segmask))
  60 #define within_hugepage_low_range(addr, len) \
  61         __within_hugepage_low_range((addr), (len), \
  62                                     current->mm->context.low_htlb_areas)
  63 #define __within_hugepage_high_range(addr, len, zonemask) \
  64         ((HTLB_AREA_MASK((addr), (len)) | (zonemask)) == (zonemask))
  65 #define within_hugepage_high_range(addr, len) \
  66         __within_hugepage_high_range((addr), (len), \
  67                                     current->mm->context.high_htlb_areas)
  68
  69 #define is_hugepage_only_range(mm, addr, len) \
  70         (touches_hugepage_high_range((mm), (addr), (len)) || \
  71           touches_hugepage_low_range((mm), (addr), (len)))
  72 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  73
  74 #define in_hugepage_area(context, addr) \
  75         (cpu_has_feature(CPU_FTR_16M_PAGE) && \
  76          ( ((1 << GET_HTLB_AREA(addr)) & (context).high_htlb_areas) || \
  77            ( ((addr) < 0x100000000L) && \
  78              ((1 << GET_ESID(addr)) & (context).low_htlb_areas) ) ) )
  79
  80 #else /* !CONFIG_HUGETLB_PAGE */
  81
  82 #define in_hugepage_area(mm, addr)      0
  83
  84 #endif /* !CONFIG_HUGETLB_PAGE */
  85
  86 /* align addr on a size boundary - adjust address up/down if needed */
  87 #define _ALIGN_UP(addr,size)    (((addr)+((size)-1))&(~((size)-1)))
  88 #define _ALIGN_DOWN(addr,size)  ((addr)&(~((size)-1)))
  89
  90 /* align addr on a size boundary - adjust address up if needed */
  91 #define _ALIGN(addr,size)     _ALIGN_UP(addr,size)
  92
  93 /* to align the pointer to the (next) page boundary */
  94 #define PAGE_ALIGN(addr)        _ALIGN(addr, PAGE_SIZE)
  95
  96 #ifdef __KERNEL__
  97 #ifndef __ASSEMBLY__
  98 #include <asm/cache.h>
  99
 100 #undef STRICT_MM_TYPECHECKS
 101
 102 #define REGION_SIZE   4UL
 103 #define REGION_SHIFT  60UL
 104 #define REGION_MASK   (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT)
 105
 106 static __inline__ void clear_page(void *addr)
 107 {
 108         unsigned long lines, line_size;
 109
 110         line_size = ppc64_caches.dline_size;
 111         lines = ppc64_caches.dlines_per_page;
 112
 113         __asm__ __volatile__(
 114         "mtctr          %1      # clear_page\n\
 115 1:      dcbz    0,%0\n\
 116         add     %0,%0,%3\n\
 117         bdnz+   1b"
 118         : "=r" (addr)
 119         : "r" (lines), "0" (addr), "r" (line_size)
 120         : "ctr", "memory");
 121 }
 122
 123 extern void copy_page(void *to, void *from);
 124 struct page;
 125 extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
 126 extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *p);
 127
 128 #ifdef STRICT_MM_TYPECHECKS
 129 /*
 130  * These are used to make use of C type-checking.
 131  * Entries in the pte table are 64b, while entries in the pgd & pmd are 32b.
 132  */
 133 typedef struct { unsigned long pte; } pte_t;
 134 typedef struct { unsigned long pmd; } pmd_t;
 135 typedef struct { unsigned long pud; } pud_t;
 136 typedef struct { unsigned long pgd; } pgd_t;
 137 typedef struct { unsigned long pgprot; } pgprot_t;
 138
 139 #define pte_val(x)      ((x).pte)
 140 #define pmd_val(x)      ((x).pmd)
 141 #define pud_val(x)      ((x).pud)
 142 #define pgd_val(x)      ((x).pgd)
 143 #define pgprot_val(x)   ((x).pgprot)
 144
 145 #define __pte(x)        ((pte_t) { (x) })
 146 #define __pmd(x)        ((pmd_t) { (x) })
 147 #define __pud(x)        ((pud_t) { (x) })
 148 #define __pgd(x)        ((pgd_t) { (x) })
 149 #define __pgprot(x)     ((pgprot_t) { (x) })
 150
 151 #else
 152 /*
 153  * .. while these make it easier on the compiler
 154  */
 155 typedef unsigned long pte_t;
 156 typedef unsigned long pmd_t;
 157 typedef unsigned long pud_t;
 158 typedef unsigned long pgd_t;
 159 typedef unsigned long pgprot_t;
 160
 161 #define pte_val(x)      (x)
 162 #define pmd_val(x)      (x)
 163 #define pud_val(x)      (x)
 164 #define pgd_val(x)      (x)
 165 #define pgprot_val(x)   (x)
 166
 167 #define __pte(x)        (x)
 168 #define __pmd(x)        (x)
 169 #define __pud(x)        (x)
 170 #define __pgd(x)        (x)
 171 #define __pgprot(x)     (x)
 172
 173 #endif
 174
 175 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
 176
 177 extern int page_is_ram(unsigned long pfn);
 178
 179 extern u64 ppc64_pft_size;              /* Log 2 of page table size */
 180
 181 /* We do define AT_SYSINFO_EHDR but don't use the gate mecanism */
 182 #define __HAVE_ARCH_GATE_AREA           1
 183
 184 #endif /* __ASSEMBLY__ */
 185
 186 #ifdef MODULE
 187 #define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
 188 #else
 189 #define __page_aligned \
 190         __attribute__((__aligned__(PAGE_SIZE), \
 191                 __section__(".data.page_aligned")))
 192 #endif
 193
 194
 195 /* This must match the -Ttext linker address            */
 196 /* Note: tophys & tovirt make assumptions about how     */
 197 /*       KERNELBASE is defined for performance reasons. */
 198 /*       When KERNELBASE moves, those macros may have   */
 199 /*             to change!                               */
 200 #define PAGE_OFFSET     ASM_CONST(0xC000000000000000)
 201 #define KERNELBASE      PAGE_OFFSET
 202 #define VMALLOCBASE     ASM_CONST(0xD000000000000000)
 203
 204 #define VMALLOC_REGION_ID  (VMALLOCBASE >> REGION_SHIFT)
 205 #define KERNEL_REGION_ID   (KERNELBASE >> REGION_SHIFT)
 206 #define USER_REGION_ID     (0UL)
 207 #define REGION_ID(ea)      (((unsigned long)(ea)) >> REGION_SHIFT)
 208
 209 #define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))
 210
 211 #ifdef CONFIG_DISCONTIGMEM
 212 #define page_to_pfn(page)       discontigmem_page_to_pfn(page)
 213 #define pfn_to_page(pfn)        discontigmem_pfn_to_page(pfn)
 214 #define pfn_valid(pfn)          discontigmem_pfn_valid(pfn)
 215 #endif
 216 #ifdef CONFIG_FLATMEM
 217 #define pfn_to_page(pfn)        (mem_map + (pfn))
 218 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 219 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 220 #endif
 221
 222 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 223 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 224
 225 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 226
 227 /*
 228  * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
 229  * and needs to be executable.  This means the whole heap ends
 230  * up being executable.
 231  */
 232 #define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
 233                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 234
 235 #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
 236                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 237
 238 #define VM_DATA_DEFAULT_FLAGS \
 239         (test_thread_flag(TIF_32BIT) ? \
 240          VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
 241
 242 /*
 243  * This is the default if a program doesn't have a PT_GNU_STACK
 244  * program header entry. The PPC64 ELF ABI has a non executable stack
 245  * stack by default, so in the absense of a PT_GNU_STACK program header
 246  * we turn execute permission off.
 247  */
 248 #define VM_STACK_DEFAULT_FLAGS32        (VM_READ | VM_WRITE | VM_EXEC | \
 249                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 250
 251 #define VM_STACK_DEFAULT_FLAGS64        (VM_READ | VM_WRITE | \
 252                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 253
 254 #define VM_STACK_DEFAULT_FLAGS \
 255         (test_thread_flag(TIF_32BIT) ? \
 256          VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
 257
 258 #endif /* __KERNEL__ */
 259
 260 #include <asm-generic/page.h>
 261
 262 #endif /* _PPC64_PAGE_H */