include/asm-powerpc/page_64.h

   1 #ifndef _ASM_POWERPC_PAGE_64_H
   2 #define _ASM_POWERPC_PAGE_64_H
   3 #ifdef __KERNEL__
   4
   5 /*
   6  * Copyright (C) 2001 PPC64 Team, IBM Corp
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version
  11  * 2 of the License, or (at your option) any later version.
  12  */
  13
  14 /*
  15  * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux
  16  * specific, every notion of page number shared with the firmware, TCEs,
  17  * iommu, etc... still uses a page size of 4K.
  18  */
  19 #define HW_PAGE_SHIFT           12
  20 #define HW_PAGE_SIZE            (ASM_CONST(1) << HW_PAGE_SHIFT)
  21 #define HW_PAGE_MASK            (~(HW_PAGE_SIZE-1))
  22
  23 /*
  24  * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and
  25  * HW_PAGE_SHIFT, that is 4K pages.
  26  */
  27 #define PAGE_FACTOR             (PAGE_SHIFT - HW_PAGE_SHIFT)
  28
  29 /* Segment size */
  30 #define SID_SHIFT               28
  31 #define SID_MASK                0xfffffffffUL
  32 #define ESID_MASK               0xfffffffff0000000UL
  33 #define GET_ESID(x)             (((x) >> SID_SHIFT) & SID_MASK)
  34
  35 #ifndef __ASSEMBLY__
  36 #include <asm/cache.h>
  37
  38 typedef unsigned long pte_basic_t;
  39
  40 static __inline__ void clear_page(void *addr)
  41 {
  42         unsigned long lines, line_size;
  43
  44         line_size = ppc64_caches.dline_size;
  45         lines = ppc64_caches.dlines_per_page;
  46
  47         __asm__ __volatile__(
  48         "mtctr  %1      # clear_page\n\
  49 1:      dcbz    0,%0\n\
  50         add     %0,%0,%3\n\
  51         bdnz+   1b"
  52         : "=r" (addr)
  53         : "r" (lines), "0" (addr), "r" (line_size)
  54         : "ctr", "memory");
  55 }
  56
  57 extern void copy_4K_page(void *to, void *from);
  58
  59 #ifdef CONFIG_PPC_64K_PAGES
  60 static inline void copy_page(void *to, void *from)
  61 {
  62         unsigned int i;
  63         for (i=0; i < (1 << (PAGE_SHIFT - 12)); i++) {
  64                 copy_4K_page(to, from);
  65                 to += 4096;
  66                 from += 4096;
  67         }
  68 }
  69 #else /* CONFIG_PPC_64K_PAGES */
  70 static inline void copy_page(void *to, void *from)
  71 {
  72         copy_4K_page(to, from);
  73 }
  74 #endif /* CONFIG_PPC_64K_PAGES */
  75
  76 /* Log 2 of page table size */
  77 extern u64 ppc64_pft_size;
  78
  79 /* Large pages size */
  80 #ifdef CONFIG_HUGETLB_PAGE
  81 extern unsigned int HPAGE_SHIFT;
  82 #else
  83 #define HPAGE_SHIFT PAGE_SHIFT
  84 #endif
  85 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
  86 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  87 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  88
  89 #endif /* __ASSEMBLY__ */
  90
  91 #ifdef CONFIG_HUGETLB_PAGE
  92
  93 #define HTLB_AREA_SHIFT         40
  94 #define HTLB_AREA_SIZE          (1UL << HTLB_AREA_SHIFT)
  95 #define GET_HTLB_AREA(x)        ((x) >> HTLB_AREA_SHIFT)
  96
  97 #define LOW_ESID_MASK(addr, len)    \
  98         (((1U << (GET_ESID(min((addr)+(len)-1, 0x100000000UL))+1)) \
  99           - (1U << GET_ESID(min((addr), 0x100000000UL)))) & 0xffff)
 100 #define HTLB_AREA_MASK(addr, len)   (((1U << (GET_HTLB_AREA(addr+len-1)+1)) \
 101                                       - (1U << GET_HTLB_AREA(addr))) & 0xffff)
 102
 103 #define ARCH_HAS_HUGEPAGE_ONLY_RANGE
 104 #define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
 105 #define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
 106 #define ARCH_HAS_SETCLEAR_HUGE_PTE
 107
 108 #define touches_hugepage_low_range(mm, addr, len) \
 109         (((addr) < 0x100000000UL) \
 110          && (LOW_ESID_MASK((addr), (len)) & (mm)->context.low_htlb_areas))
 111 #define touches_hugepage_high_range(mm, addr, len) \
 112         ((((addr) + (len)) > 0x100000000UL) \
 113           && (HTLB_AREA_MASK((addr), (len)) & (mm)->context.high_htlb_areas))
 114
 115 #define __within_hugepage_low_range(addr, len, segmask) \
 116         ( (((addr)+(len)) <= 0x100000000UL) \
 117           && ((LOW_ESID_MASK((addr), (len)) | (segmask)) == (segmask)))
 118 #define within_hugepage_low_range(addr, len) \
 119         __within_hugepage_low_range((addr), (len), \
 120                                     current->mm->context.low_htlb_areas)
 121 #define __within_hugepage_high_range(addr, len, zonemask) \
 122         ( ((addr) >= 0x100000000UL) \
 123           && ((HTLB_AREA_MASK((addr), (len)) | (zonemask)) == (zonemask)))
 124 #define within_hugepage_high_range(addr, len) \
 125         __within_hugepage_high_range((addr), (len), \
 126                                     current->mm->context.high_htlb_areas)
 127
 128 #define is_hugepage_only_range(mm, addr, len) \
 129         (touches_hugepage_high_range((mm), (addr), (len)) || \
 130           touches_hugepage_low_range((mm), (addr), (len)))
 131 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 132
 133 #define in_hugepage_area(context, addr) \
 134         (cpu_has_feature(CPU_FTR_16M_PAGE) && \
 135          ( ( (addr) >= 0x100000000UL) \
 136            ? ((1 << GET_HTLB_AREA(addr)) & (context).high_htlb_areas) \
 137            : ((1 << GET_ESID(addr)) & (context).low_htlb_areas) ) )
 138
 139 #else /* !CONFIG_HUGETLB_PAGE */
 140
 141 #define in_hugepage_area(mm, addr)      0
 142
 143 #endif /* !CONFIG_HUGETLB_PAGE */
 144
 145 #ifdef MODULE
 146 #define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
 147 #else
 148 #define __page_aligned \
 149         __attribute__((__aligned__(PAGE_SIZE), \
 150                 __section__(".data.page_aligned")))
 151 #endif
 152
 153 #define VM_DATA_DEFAULT_FLAGS \
 154         (test_thread_flag(TIF_32BIT) ? \
 155          VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
 156
 157 /*
 158  * This is the default if a program doesn't have a PT_GNU_STACK
 159  * program header entry. The PPC64 ELF ABI has a non executable stack
 160  * stack by default, so in the absense of a PT_GNU_STACK program header
 161  * we turn execute permission off.
 162  */
 163 #define VM_STACK_DEFAULT_FLAGS32        (VM_READ | VM_WRITE | VM_EXEC | \
 164                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 165
 166 #define VM_STACK_DEFAULT_FLAGS64        (VM_READ | VM_WRITE | \
 167                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 168
 169 #define VM_STACK_DEFAULT_FLAGS \
 170         (test_thread_flag(TIF_32BIT) ? \
 171          VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
 172
 173 #include <asm-generic/page.h>
 174
 175 #endif /* __KERNEL__ */
 176 #endif /* _ASM_POWERPC_PAGE_64_H */