include/asm-powerpc/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 #define REGION_SIZE   4UL
  29 #define REGION_SHIFT  60UL
  30 #define REGION_MASK   (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT)
  31
  32 #define VMALLOCBASE             ASM_CONST(0xD000000000000000)
  33 #define VMALLOC_REGION_ID       (VMALLOCBASE >> REGION_SHIFT)
  34 #define KERNEL_REGION_ID        (KERNELBASE >> REGION_SHIFT)
  35 #define USER_REGION_ID          (0UL)
  36 #define REGION_ID(ea)           (((unsigned long)(ea)) >> REGION_SHIFT)
  37
  38 /* Segment size */
  39 #define SID_SHIFT               28
  40 #define SID_MASK                0xfffffffffUL
  41 #define ESID_MASK               0xfffffffff0000000UL
  42 #define GET_ESID(x)             (((x) >> SID_SHIFT) & SID_MASK)
  43
  44 #ifndef __ASSEMBLY__
  45 #include <asm/cache.h>
  46
  47 typedef unsigned long pte_basic_t;
  48
  49 static __inline__ void clear_page(void *addr)
  50 {
  51         unsigned long lines, line_size;
  52
  53         line_size = ppc64_caches.dline_size;
  54         lines = ppc64_caches.dlines_per_page;
  55
  56         __asm__ __volatile__(
  57         "mtctr  %1      # clear_page\n\
  58 1:      dcbz    0,%0\n\
  59         add     %0,%0,%3\n\
  60         bdnz+   1b"
  61         : "=r" (addr)
  62         : "r" (lines), "0" (addr), "r" (line_size)
  63         : "ctr", "memory");
  64 }
  65
  66 extern void copy_4K_page(void *to, void *from);
  67
  68 #ifdef CONFIG_PPC_64K_PAGES
  69 static inline void copy_page(void *to, void *from)
  70 {
  71         unsigned int i;
  72         for (i=0; i < (1 << (PAGE_SHIFT - 12)); i++) {
  73                 copy_4K_page(to, from);
  74                 to += 4096;
  75                 from += 4096;
  76         }
  77 }
  78 #else /* CONFIG_PPC_64K_PAGES */
  79 static inline void copy_page(void *to, void *from)
  80 {
  81         copy_4K_page(to, from);
  82 }
  83 #endif /* CONFIG_PPC_64K_PAGES */
  84
  85 /* Log 2 of page table size */
  86 extern u64 ppc64_pft_size;
  87
  88 /* Large pages size */
  89 extern unsigned int HPAGE_SHIFT;
  90 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
  91 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  92 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  93
  94 #endif /* __ASSEMBLY__ */
  95
  96 #ifdef CONFIG_HUGETLB_PAGE
  97
  98 #define HTLB_AREA_SHIFT         40
  99 #define HTLB_AREA_SIZE          (1UL << HTLB_AREA_SHIFT)
 100 #define GET_HTLB_AREA(x)        ((x) >> HTLB_AREA_SHIFT)
 101
 102 #define LOW_ESID_MASK(addr, len)    (((1U << (GET_ESID(addr+len-1)+1)) \
 103                                       - (1U << GET_ESID(addr))) & 0xffff)
 104 #define HTLB_AREA_MASK(addr, len)   (((1U << (GET_HTLB_AREA(addr+len-1)+1)) \
 105                                       - (1U << GET_HTLB_AREA(addr))) & 0xffff)
 106
 107 #define ARCH_HAS_HUGEPAGE_ONLY_RANGE
 108 #define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
 109 #define ARCH_HAS_SETCLEAR_HUGE_PTE
 110
 111 #define touches_hugepage_low_range(mm, addr, len) \
 112         (LOW_ESID_MASK((addr), (len)) & (mm)->context.low_htlb_areas)
 113 #define touches_hugepage_high_range(mm, addr, len) \
 114         (HTLB_AREA_MASK((addr), (len)) & (mm)->context.high_htlb_areas)
 115
 116 #define __within_hugepage_low_range(addr, len, segmask) \
 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         ((HTLB_AREA_MASK((addr), (len)) | (zonemask)) == (zonemask))
 123 #define within_hugepage_high_range(addr, len) \
 124         __within_hugepage_high_range((addr), (len), \
 125                                     current->mm->context.high_htlb_areas)
 126
 127 #define is_hugepage_only_range(mm, addr, len) \
 128         (touches_hugepage_high_range((mm), (addr), (len)) || \
 129           touches_hugepage_low_range((mm), (addr), (len)))
 130 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 131
 132 #define in_hugepage_area(context, addr) \
 133         (cpu_has_feature(CPU_FTR_16M_PAGE) && \
 134          ( ((1 << GET_HTLB_AREA(addr)) & (context).high_htlb_areas) || \
 135            ( ((addr) < 0x100000000L) && \
 136              ((1 << GET_ESID(addr)) & (context).low_htlb_areas) ) ) )
 137
 138 #else /* !CONFIG_HUGETLB_PAGE */
 139
 140 #define in_hugepage_area(mm, addr)      0
 141
 142 #endif /* !CONFIG_HUGETLB_PAGE */
 143
 144 #ifdef MODULE
 145 #define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
 146 #else
 147 #define __page_aligned \
 148         __attribute__((__aligned__(PAGE_SIZE), \
 149                 __section__(".data.page_aligned")))
 150 #endif
 151
 152 #define VM_DATA_DEFAULT_FLAGS \
 153         (test_thread_flag(TIF_32BIT) ? \
 154          VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
 155
 156 /*
 157  * This is the default if a program doesn't have a PT_GNU_STACK
 158  * program header entry. The PPC64 ELF ABI has a non executable stack
 159  * stack by default, so in the absense of a PT_GNU_STACK program header
 160  * we turn execute permission off.
 161  */
 162 #define VM_STACK_DEFAULT_FLAGS32        (VM_READ | VM_WRITE | VM_EXEC | \
 163                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 164
 165 #define VM_STACK_DEFAULT_FLAGS64        (VM_READ | VM_WRITE | \
 166                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 167
 168 #define VM_STACK_DEFAULT_FLAGS \
 169         (test_thread_flag(TIF_32BIT) ? \
 170          VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
 171
 172 #include <asm-generic/page.h>
 173
 174 #endif /* _ASM_POWERPC_PAGE_64_H */