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 #define PAGE_OFFSET_MASK (PAGE_SIZE-1)
  27
  28 #define SID_SHIFT       28
  29 #define SID_MASK        0xfffffffffUL
  30 #define ESID_MASK       0xfffffffff0000000UL
  31 #define GET_ESID(x)     (((x) >> SID_SHIFT) & SID_MASK)
  32
  33 #define HPAGE_SHIFT     24
  34 #define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
  35 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  36
  37 #ifdef CONFIG_HUGETLB_PAGE
  38
  39 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  40
  41 /* For 64-bit processes the hugepage range is 1T-1.5T */
  42 #define TASK_HPAGE_BASE ASM_CONST(0x0000010000000000)
  43 #define TASK_HPAGE_END  ASM_CONST(0x0000018000000000)
  44
  45 #define LOW_ESID_MASK(addr, len)        (((1U << (GET_ESID(addr+len-1)+1)) \
  46                                         - (1U << GET_ESID(addr))) & 0xffff)
  47
  48 #define ARCH_HAS_HUGEPAGE_ONLY_RANGE
  49 #define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  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) double word boundary */
  89 #define DOUBLEWORD_ALIGN(addr)  _ALIGN(addr,sizeof(unsigned long))
  90
  91 /* to align the pointer to the (next) page boundary */
  92 #define PAGE_ALIGN(addr)        _ALIGN(addr, PAGE_SIZE)
  93
  94 #ifdef __KERNEL__
  95 #ifndef __ASSEMBLY__
  96 #include <asm/cache.h>
  97
  98 #undef STRICT_MM_TYPECHECKS
  99
 100 #define REGION_SIZE   4UL
 101 #define REGION_SHIFT  60UL
 102 #define REGION_MASK   (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT)
 103 #define REGION_STRIDE (1UL << REGION_SHIFT)
 104
 105 static __inline__ void clear_page(void *addr)
 106 {
 107         unsigned long lines, line_size;
 108
 109         line_size = ppc64_caches.dline_size;
 110         lines = ppc64_caches.dlines_per_page;
 111
 112         __asm__ __volatile__(
 113         "mtctr          %1      # clear_page\n\
 114 1:      dcbz    0,%0\n\
 115         add     %0,%0,%3\n\
 116         bdnz+   1b"
 117         : "=r" (addr)
 118         : "r" (lines), "0" (addr), "r" (line_size)
 119         : "ctr", "memory");
 120 }
 121
 122 extern void copy_page(void *to, void *from);
 123 struct page;
 124 extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
 125 extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *p);
 126
 127 #ifdef STRICT_MM_TYPECHECKS
 128 /*
 129  * These are used to make use of C type-checking.
 130  * Entries in the pte table are 64b, while entries in the pgd & pmd are 32b.
 131  */
 132 typedef struct { unsigned long pte; } pte_t;
 133 typedef struct { unsigned int  pmd; } pmd_t;
 134 typedef struct { unsigned int  pgd; } pgd_t;
 135 typedef struct { unsigned long pgprot; } pgprot_t;
 136
 137 #define pte_val(x)      ((x).pte)
 138 #define pmd_val(x)      ((x).pmd)
 139 #define pgd_val(x)      ((x).pgd)
 140 #define pgprot_val(x)   ((x).pgprot)
 141
 142 #define __pte(x)        ((pte_t) { (x) } )
 143 #define __pmd(x)        ((pmd_t) { (x) } )
 144 #define __pgd(x)        ((pgd_t) { (x) } )
 145 #define __pgprot(x)     ((pgprot_t) { (x) } )
 146
 147 #else
 148 /*
 149  * .. while these make it easier on the compiler
 150  */
 151 typedef unsigned long pte_t;
 152 typedef unsigned int  pmd_t;
 153 typedef unsigned int  pgd_t;
 154 typedef unsigned long pgprot_t;
 155
 156 #define pte_val(x)      (x)
 157 #define pmd_val(x)      (x)
 158 #define pgd_val(x)      (x)
 159 #define pgprot_val(x)   (x)
 160
 161 #define __pte(x)        (x)
 162 #define __pmd(x)        (x)
 163 #define __pgd(x)        (x)
 164 #define __pgprot(x)     (x)
 165
 166 #endif
 167
 168 /* Pure 2^n version of get_order */
 169 static inline int get_order(unsigned long size)
 170 {
 171         int order;
 172
 173         size = (size-1) >> (PAGE_SHIFT-1);
 174         order = -1;
 175         do {
 176                 size >>= 1;
 177                 order++;
 178         } while (size);
 179         return order;
 180 }
 181
 182 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
 183
 184 extern int page_is_ram(unsigned long pfn);
 185
 186 extern u64 ppc64_pft_size;              /* Log 2 of page table size */
 187
 188 /* We do define AT_SYSINFO_EHDR but don't use the gate mecanism */
 189 #define __HAVE_ARCH_GATE_AREA           1
 190
 191 #endif /* __ASSEMBLY__ */
 192
 193 #ifdef MODULE
 194 #define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
 195 #else
 196 #define __page_aligned \
 197         __attribute__((__aligned__(PAGE_SIZE), \
 198                 __section__(".data.page_aligned")))
 199 #endif
 200
 201
 202 /* This must match the -Ttext linker address            */
 203 /* Note: tophys & tovirt make assumptions about how     */
 204 /*       KERNELBASE is defined for performance reasons. */
 205 /*       When KERNELBASE moves, those macros may have   */
 206 /*             to change!                               */
 207 #define PAGE_OFFSET     ASM_CONST(0xC000000000000000)
 208 #define KERNELBASE      PAGE_OFFSET
 209 #define VMALLOCBASE     ASM_CONST(0xD000000000000000)
 210 #define IOREGIONBASE    ASM_CONST(0xE000000000000000)
 211
 212 #define IO_REGION_ID       (IOREGIONBASE>>REGION_SHIFT)
 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(X)       (((unsigned long)(X))>>REGION_SHIFT)
 217
 218 #define __bpn_to_ba(x) ((((unsigned long)(x))<<PAGE_SHIFT) + KERNELBASE)
 219 #define __ba_to_bpn(x) ((((unsigned long)(x)) & ~REGION_MASK) >> PAGE_SHIFT)
 220
 221 #define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))
 222
 223 #ifdef CONFIG_DISCONTIGMEM
 224 #define page_to_pfn(page)       discontigmem_page_to_pfn(page)
 225 #define pfn_to_page(pfn)        discontigmem_pfn_to_page(pfn)
 226 #define pfn_valid(pfn)          discontigmem_pfn_valid(pfn)
 227 #else
 228 #define pfn_to_page(pfn)        (mem_map + (pfn))
 229 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 230 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 231 #endif
 232
 233 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 234 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 235
 236 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 237
 238 /*
 239  * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
 240  * and needs to be executable.  This means the whole heap ends
 241  * up being executable.
 242  */
 243 #define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
 244                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 245
 246 #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
 247                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 248
 249 #define VM_DATA_DEFAULT_FLAGS \
 250         (test_thread_flag(TIF_32BIT) ? \
 251          VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
 252
 253 /*
 254  * This is the default if a program doesn't have a PT_GNU_STACK
 255  * program header entry.
 256  */
 257 #define VM_STACK_DEFAULT_FLAGS  (VM_READ | VM_WRITE | VM_EXEC | \
 258                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 259
 260 #endif /* __KERNEL__ */
 261 #endif /* _PPC64_PAGE_H */