arch/powerpc/include/asm/page_64.h

   1 #ifndef _ASM_POWERPC_PAGE_64_H
   2 #define _ASM_POWERPC_PAGE_64_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 /*
  14  * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux
  15  * specific, every notion of page number shared with the firmware, TCEs,
  16  * iommu, etc... still uses a page size of 4K.
  17  */
  18 #define HW_PAGE_SHIFT           12
  19 #define HW_PAGE_SIZE            (ASM_CONST(1) << HW_PAGE_SHIFT)
  20 #define HW_PAGE_MASK            (~(HW_PAGE_SIZE-1))
  21
  22 /*
  23  * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and
  24  * HW_PAGE_SHIFT, that is 4K pages.
  25  */
  26 #define PAGE_FACTOR             (PAGE_SHIFT - HW_PAGE_SHIFT)
  27
  28 /* Segment size; normal 256M segments */
  29 #define SID_SHIFT               28
  30 #define SID_MASK                ASM_CONST(0xfffffffff)
  31 #define ESID_MASK               0xfffffffff0000000UL
  32 #define GET_ESID(x)             (((x) >> SID_SHIFT) & SID_MASK)
  33
  34 /* 1T segments */
  35 #define SID_SHIFT_1T            40
  36 #define SID_MASK_1T             0xffffffUL
  37 #define ESID_MASK_1T            0xffffff0000000000UL
  38 #define GET_ESID_1T(x)          (((x) >> SID_SHIFT_1T) & SID_MASK_1T)
  39
  40 #ifndef __ASSEMBLY__
  41 #include <asm/cache.h>
  42
  43 typedef unsigned long pte_basic_t;
  44
  45 static __inline__ void clear_page(void *addr)
  46 {
  47         unsigned long lines, line_size;
  48
  49         line_size = ppc64_caches.dline_size;
  50         lines = ppc64_caches.dlines_per_page;
  51
  52         __asm__ __volatile__(
  53         "mtctr  %1      # clear_page\n\
  54 1:      dcbz    0,%0\n\
  55         add     %0,%0,%3\n\
  56         bdnz+   1b"
  57         : "=r" (addr)
  58         : "r" (lines), "0" (addr), "r" (line_size)
  59         : "ctr", "memory");
  60 }
  61
  62 extern void copy_4K_page(void *to, void *from);
  63
  64 #ifdef CONFIG_PPC_64K_PAGES
  65 static inline void copy_page(void *to, void *from)
  66 {
  67         unsigned int i;
  68         for (i=0; i < (1 << (PAGE_SHIFT - 12)); i++) {
  69                 copy_4K_page(to, from);
  70                 to += 4096;
  71                 from += 4096;
  72         }
  73 }
  74 #else /* CONFIG_PPC_64K_PAGES */
  75 static inline void copy_page(void *to, void *from)
  76 {
  77         copy_4K_page(to, from);
  78 }
  79 #endif /* CONFIG_PPC_64K_PAGES */
  80
  81 /* Log 2 of page table size */
  82 extern u64 ppc64_pft_size;
  83
  84 /* Large pages size */
  85 #ifdef CONFIG_HUGETLB_PAGE
  86 extern unsigned int HPAGE_SHIFT;
  87 #else
  88 #define HPAGE_SHIFT PAGE_SHIFT
  89 #endif
  90 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
  91 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  92 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  93 #define HUGE_MAX_HSTATE         3
  94
  95 #endif /* __ASSEMBLY__ */
  96
  97 #ifdef CONFIG_PPC_MM_SLICES
  98
  99 #define SLICE_LOW_SHIFT         28
 100 #define SLICE_HIGH_SHIFT        40
 101
 102 #define SLICE_LOW_TOP           (0x100000000ul)
 103 #define SLICE_NUM_LOW           (SLICE_LOW_TOP >> SLICE_LOW_SHIFT)
 104 #define SLICE_NUM_HIGH          (PGTABLE_RANGE >> SLICE_HIGH_SHIFT)
 105
 106 #define GET_LOW_SLICE_INDEX(addr)       ((addr) >> SLICE_LOW_SHIFT)
 107 #define GET_HIGH_SLICE_INDEX(addr)      ((addr) >> SLICE_HIGH_SHIFT)
 108
 109 #ifndef __ASSEMBLY__
 110
 111 struct slice_mask {
 112         u16 low_slices;
 113         u16 high_slices;
 114 };
 115
 116 struct mm_struct;
 117
 118 extern unsigned long slice_get_unmapped_area(unsigned long addr,
 119                                              unsigned long len,
 120                                              unsigned long flags,
 121                                              unsigned int psize,
 122                                              int topdown,
 123                                              int use_cache);
 124
 125 extern unsigned int get_slice_psize(struct mm_struct *mm,
 126                                     unsigned long addr);
 127
 128 extern void slice_init_context(struct mm_struct *mm, unsigned int psize);
 129 extern void slice_set_user_psize(struct mm_struct *mm, unsigned int psize);
 130 extern void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
 131                                   unsigned long len, unsigned int psize);
 132
 133 #define slice_mm_new_context(mm)        ((mm)->context.id == 0)
 134
 135 #endif /* __ASSEMBLY__ */
 136 #else
 137 #define slice_init()
 138 #define get_slice_psize(mm, addr)       ((mm)->context.user_psize)
 139 #define slice_set_user_psize(mm, psize)         \
 140 do {                                            \
 141         (mm)->context.user_psize = (psize);     \
 142         (mm)->context.sllp = SLB_VSID_USER | mmu_psize_defs[(psize)].sllp; \
 143 } while (0)
 144 #define slice_set_range_psize(mm, start, len, psize)    \
 145         slice_set_user_psize((mm), (psize))
 146 #define slice_mm_new_context(mm)        1
 147 #endif /* CONFIG_PPC_MM_SLICES */
 148
 149 #ifdef CONFIG_HUGETLB_PAGE
 150
 151 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 152
 153 #endif /* !CONFIG_HUGETLB_PAGE */
 154
 155 #ifdef MODULE
 156 #define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
 157 #else
 158 #define __page_aligned \
 159         __attribute__((__aligned__(PAGE_SIZE), \
 160                 __section__(".data.page_aligned")))
 161 #endif
 162
 163 #define VM_DATA_DEFAULT_FLAGS \
 164         (test_thread_flag(TIF_32BIT) ? \
 165          VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
 166
 167 /*
 168  * This is the default if a program doesn't have a PT_GNU_STACK
 169  * program header entry. The PPC64 ELF ABI has a non executable stack
 170  * stack by default, so in the absense of a PT_GNU_STACK program header
 171  * we turn execute permission off.
 172  */
 173 #define VM_STACK_DEFAULT_FLAGS32        (VM_READ | VM_WRITE | VM_EXEC | \
 174                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 175
 176 #define VM_STACK_DEFAULT_FLAGS64        (VM_READ | VM_WRITE | \
 177                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 178
 179 #define VM_STACK_DEFAULT_FLAGS \
 180         (test_thread_flag(TIF_32BIT) ? \
 181          VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
 182
 183 #include <asm-generic/page.h>
 184
 185 #endif /* _ASM_POWERPC_PAGE_64_H */