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 /* For 64-bit processes the hugepage range is 1T-1.5T */
  41 #define TASK_HPAGE_BASE ASM_CONST(0x0000010000000000)
  42 #define TASK_HPAGE_END  ASM_CONST(0x0000018000000000)
  43
  44 #define LOW_ESID_MASK(addr, len)        (((1U << (GET_ESID(addr+len-1)+1)) \
  45                                         - (1U << GET_ESID(addr))) & 0xffff)
  46
  47 #define ARCH_HAS_HUGEPAGE_ONLY_RANGE
  48 #define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  49 #define ARCH_HAS_SETCLEAR_HUGE_PTE
  50
  51 #define touches_hugepage_low_range(mm, addr, len) \
  52         (LOW_ESID_MASK((addr), (len)) & mm->context.htlb_segs)
  53 #define touches_hugepage_high_range(addr, len) \
  54         (((addr) > (TASK_HPAGE_BASE-(len))) && ((addr) < TASK_HPAGE_END))
  55
  56 #define __within_hugepage_low_range(addr, len, segmask) \
  57         ((LOW_ESID_MASK((addr), (len)) | (segmask)) == (segmask))
  58 #define within_hugepage_low_range(addr, len) \
  59         __within_hugepage_low_range((addr), (len), \
  60                                     current->mm->context.htlb_segs)
  61 #define within_hugepage_high_range(addr, len) (((addr) >= TASK_HPAGE_BASE) \
  62           && ((addr)+(len) <= TASK_HPAGE_END) && ((addr)+(len) >= (addr)))
  63
  64 #define is_hugepage_only_range(mm, addr, len) \
  65         (touches_hugepage_high_range((addr), (len)) || \
  66           touches_hugepage_low_range((mm), (addr), (len)))
  67 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  68
  69 #define in_hugepage_area(context, addr) \
  70         (cpu_has_feature(CPU_FTR_16M_PAGE) && \
  71          ( (((addr) >= TASK_HPAGE_BASE) && ((addr) < TASK_HPAGE_END)) || \
  72            ( ((addr) < 0x100000000L) && \
  73              ((1 << GET_ESID(addr)) & (context).htlb_segs) ) ) )
  74
  75 #else /* !CONFIG_HUGETLB_PAGE */
  76
  77 #define in_hugepage_area(mm, addr)      0
  78
  79 #endif /* !CONFIG_HUGETLB_PAGE */
  80
  81 /* align addr on a size boundary - adjust address up/down if needed */
  82 #define _ALIGN_UP(addr,size)    (((addr)+((size)-1))&(~((size)-1)))
  83 #define _ALIGN_DOWN(addr,size)  ((addr)&(~((size)-1)))
  84
  85 /* align addr on a size boundary - adjust address up if needed */
  86 #define _ALIGN(addr,size)     _ALIGN_UP(addr,size)
  87
  88 /* to align the pointer to the (next) page boundary */
  89 #define PAGE_ALIGN(addr)        _ALIGN(addr, PAGE_SIZE)
  90
  91 #ifdef __KERNEL__
  92 #ifndef __ASSEMBLY__
  93 #include <asm/cache.h>
  94
  95 #undef STRICT_MM_TYPECHECKS
  96
  97 #define REGION_SIZE   4UL
  98 #define REGION_SHIFT  60UL
  99 #define REGION_MASK   (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT)
 100
 101 static __inline__ void clear_page(void *addr)
 102 {
 103         unsigned long lines, line_size;
 104
 105         line_size = ppc64_caches.dline_size;
 106         lines = ppc64_caches.dlines_per_page;
 107
 108         __asm__ __volatile__(
 109         "mtctr          %1      # clear_page\n\
 110 1:      dcbz    0,%0\n\
 111         add     %0,%0,%3\n\
 112         bdnz+   1b"
 113         : "=r" (addr)
 114         : "r" (lines), "0" (addr), "r" (line_size)
 115         : "ctr", "memory");
 116 }
 117
 118 extern void copy_page(void *to, void *from);
 119 struct page;
 120 extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
 121 extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *p);
 122
 123 #ifdef STRICT_MM_TYPECHECKS
 124 /*
 125  * These are used to make use of C type-checking.
 126  * Entries in the pte table are 64b, while entries in the pgd & pmd are 32b.
 127  */
 128 typedef struct { unsigned long pte; } pte_t;
 129 typedef struct { unsigned long pmd; } pmd_t;
 130 typedef struct { unsigned long pud; } pud_t;
 131 typedef struct { unsigned long pgd; } pgd_t;
 132 typedef struct { unsigned long pgprot; } pgprot_t;
 133
 134 #define pte_val(x)      ((x).pte)
 135 #define pmd_val(x)      ((x).pmd)
 136 #define pud_val(x)      ((x).pud)
 137 #define pgd_val(x)      ((x).pgd)
 138 #define pgprot_val(x)   ((x).pgprot)
 139
 140 #define __pte(x)        ((pte_t) { (x) })
 141 #define __pmd(x)        ((pmd_t) { (x) })
 142 #define __pud(x)        ((pud_t) { (x) })
 143 #define __pgd(x)        ((pgd_t) { (x) })
 144 #define __pgprot(x)     ((pgprot_t) { (x) })
 145
 146 #else
 147 /*
 148  * .. while these make it easier on the compiler
 149  */
 150 typedef unsigned long pte_t;
 151 typedef unsigned long pmd_t;
 152 typedef unsigned long pud_t;
 153 typedef unsigned long pgd_t;
 154 typedef unsigned long pgprot_t;
 155
 156 #define pte_val(x)      (x)
 157 #define pmd_val(x)      (x)
 158 #define pud_val(x)      (x)
 159 #define pgd_val(x)      (x)
 160 #define pgprot_val(x)   (x)
 161
 162 #define __pte(x)        (x)
 163 #define __pmd(x)        (x)
 164 #define __pud(x)        (x)
 165 #define __pgd(x)        (x)
 166 #define __pgprot(x)     (x)
 167
 168 #endif
 169
 170 /* Pure 2^n version of get_order */
 171 static inline int get_order(unsigned long size)
 172 {
 173         int order;
 174
 175         size = (size-1) >> (PAGE_SHIFT-1);
 176         order = -1;
 177         do {
 178                 size >>= 1;
 179                 order++;
 180         } while (size);
 181         return order;
 182 }
 183
 184 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
 185
 186 extern int page_is_ram(unsigned long pfn);
 187
 188 extern u64 ppc64_pft_size;              /* Log 2 of page table size */
 189
 190 /* We do define AT_SYSINFO_EHDR but don't use the gate mecanism */
 191 #define __HAVE_ARCH_GATE_AREA           1
 192
 193 #endif /* __ASSEMBLY__ */
 194
 195 #ifdef MODULE
 196 #define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
 197 #else
 198 #define __page_aligned \
 199         __attribute__((__aligned__(PAGE_SIZE), \
 200                 __section__(".data.page_aligned")))
 201 #endif
 202
 203
 204 /* This must match the -Ttext linker address            */
 205 /* Note: tophys & tovirt make assumptions about how     */
 206 /*       KERNELBASE is defined for performance reasons. */
 207 /*       When KERNELBASE moves, those macros may have   */
 208 /*             to change!                               */
 209 #define PAGE_OFFSET     ASM_CONST(0xC000000000000000)
 210 #define KERNELBASE      PAGE_OFFSET
 211 #define VMALLOCBASE     ASM_CONST(0xD000000000000000)
 212
 213 #define VMALLOC_REGION_ID  (VMALLOCBASE >> REGION_SHIFT)
 214 #define KERNEL_REGION_ID   (KERNELBASE >> REGION_SHIFT)
 215 #define USER_REGION_ID     (0UL)
 216 #define REGION_ID(ea)      (((unsigned long)(ea)) >> REGION_SHIFT)
 217
 218 #define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))
 219
 220 #ifdef CONFIG_DISCONTIGMEM
 221 #define page_to_pfn(page)       discontigmem_page_to_pfn(page)
 222 #define pfn_to_page(pfn)        discontigmem_pfn_to_page(pfn)
 223 #define pfn_valid(pfn)          discontigmem_pfn_valid(pfn)
 224 #endif
 225 #ifdef CONFIG_FLATMEM
 226 #define pfn_to_page(pfn)        (mem_map + (pfn))
 227 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 228 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 229 #endif
 230
 231 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 232 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 233
 234 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 235
 236 /*
 237  * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
 238  * and needs to be executable.  This means the whole heap ends
 239  * up being executable.
 240  */
 241 #define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
 242                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 243
 244 #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
 245                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 246
 247 #define VM_DATA_DEFAULT_FLAGS \
 248         (test_thread_flag(TIF_32BIT) ? \
 249          VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
 250
 251 /*
 252  * This is the default if a program doesn't have a PT_GNU_STACK
 253  * program header entry. The PPC64 ELF ABI has a non executable stack
 254  * stack by default, so in the absense of a PT_GNU_STACK program header
 255  * we turn execute permission off.
 256  */
 257 #define VM_STACK_DEFAULT_FLAGS32        (VM_READ | VM_WRITE | VM_EXEC | \
 258                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 259
 260 #define VM_STACK_DEFAULT_FLAGS64        (VM_READ | VM_WRITE | \
 261                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 262
 263 #define VM_STACK_DEFAULT_FLAGS \
 264         (test_thread_flag(TIF_32BIT) ? \
 265          VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
 266
 267 #endif /* __KERNEL__ */
 268 #endif /* _PPC64_PAGE_H */