arch/unicore32/include/asm/pgtable.h

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This source file includes following definitions.
pte_mkspecial
pte_modify
   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * linux/arch/unicore32/include/asm/pgtable.h
   4  *
   5  * Code specific to PKUnity SoC and UniCore ISA
   6  *
   7  * Copyright (C) 2001-2010 GUAN Xue-tao
   8  */
   9 #ifndef __UNICORE_PGTABLE_H__
  10 #define __UNICORE_PGTABLE_H__
  11 
  12 #define __ARCH_USE_5LEVEL_HACK
  13 #include <asm-generic/pgtable-nopmd.h>
  14 #include <asm/cpu-single.h>
  15 
  16 #include <asm/memory.h>
  17 #include <asm/pgtable-hwdef.h>
  18 
  19 /*
  20  * Just any arbitrary offset to the start of the vmalloc VM area: the
  21  * current 8MB value just means that there will be a 8MB "hole" after the
  22  * physical memory until the kernel virtual memory starts.  That means that
  23  * any out-of-bounds memory accesses will hopefully be caught.
  24  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  25  * area for the same reason. ;)
  26  *
  27  * Note that platforms may override VMALLOC_START, but they must provide
  28  * VMALLOC_END.  VMALLOC_END defines the (exclusive) limit of this space,
  29  * which may not overlap IO space.
  30  */
  31 #ifndef VMALLOC_START
  32 #define VMALLOC_OFFSET          SZ_8M
  33 #define VMALLOC_START           (((unsigned long)high_memory + VMALLOC_OFFSET) \
  34                                         & ~(VMALLOC_OFFSET-1))
  35 #define VMALLOC_END             (0xff000000UL)
  36 #endif
  37 
  38 #define PTRS_PER_PTE            1024
  39 #define PTRS_PER_PGD            1024
  40 
  41 /*
  42  * PGDIR_SHIFT determines what a third-level page table entry can map
  43  */
  44 #define PGDIR_SHIFT             22
  45 
  46 #ifndef __ASSEMBLY__
  47 extern void __pte_error(const char *file, int line, unsigned long val);
  48 extern void __pgd_error(const char *file, int line, unsigned long val);
  49 
  50 #define pte_ERROR(pte)          __pte_error(__FILE__, __LINE__, pte_val(pte))
  51 #define pgd_ERROR(pgd)          __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
  52 #endif /* !__ASSEMBLY__ */
  53 
  54 #define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
  55 #define PGDIR_MASK              (~(PGDIR_SIZE-1))
  56 
  57 /*
  58  * This is the lowest virtual address we can permit any user space
  59  * mapping to be mapped at.  This is particularly important for
  60  * non-high vector CPUs.
  61  */
  62 #define FIRST_USER_ADDRESS      PAGE_SIZE
  63 
  64 #define FIRST_USER_PGD_NR       1
  65 #define USER_PTRS_PER_PGD       ((TASK_SIZE/PGDIR_SIZE) - FIRST_USER_PGD_NR)
  66 
  67 /*
  68  * section address mask and size definitions.
  69  */
  70 #define SECTION_SHIFT           22
  71 #define SECTION_SIZE            (1UL << SECTION_SHIFT)
  72 #define SECTION_MASK            (~(SECTION_SIZE-1))
  73 
  74 #ifndef __ASSEMBLY__
  75 
  76 /*
  77  * The pgprot_* and protection_map entries will be fixed up in runtime
  78  * to include the cachable bits based on memory policy, as well as any
  79  * architecture dependent bits.
  80  */
  81 #define _PTE_DEFAULT            (PTE_PRESENT | PTE_YOUNG | PTE_CACHEABLE)
  82 
  83 extern pgprot_t pgprot_user;
  84 extern pgprot_t pgprot_kernel;
  85 
  86 #define PAGE_NONE               pgprot_user
  87 #define PAGE_SHARED             __pgprot(pgprot_val(pgprot_user | PTE_READ \
  88                                                                 | PTE_WRITE))
  89 #define PAGE_SHARED_EXEC        __pgprot(pgprot_val(pgprot_user | PTE_READ \
  90                                                                 | PTE_WRITE \
  91                                                                 | PTE_EXEC))
  92 #define PAGE_COPY               __pgprot(pgprot_val(pgprot_user | PTE_READ)
  93 #define PAGE_COPY_EXEC          __pgprot(pgprot_val(pgprot_user | PTE_READ \
  94                                                                 | PTE_EXEC))
  95 #define PAGE_READONLY           __pgprot(pgprot_val(pgprot_user | PTE_READ))
  96 #define PAGE_READONLY_EXEC      __pgprot(pgprot_val(pgprot_user | PTE_READ \
  97                                                                 | PTE_EXEC))
  98 #define PAGE_KERNEL             pgprot_kernel
  99 #define PAGE_KERNEL_EXEC        __pgprot(pgprot_val(pgprot_kernel | PTE_EXEC))
 100 
 101 #define __PAGE_NONE             __pgprot(_PTE_DEFAULT)
 102 #define __PAGE_SHARED           __pgprot(_PTE_DEFAULT | PTE_READ \
 103                                                         | PTE_WRITE)
 104 #define __PAGE_SHARED_EXEC      __pgprot(_PTE_DEFAULT | PTE_READ \
 105                                                         | PTE_WRITE \
 106                                                         | PTE_EXEC)
 107 #define __PAGE_COPY             __pgprot(_PTE_DEFAULT | PTE_READ)
 108 #define __PAGE_COPY_EXEC        __pgprot(_PTE_DEFAULT | PTE_READ \
 109                                                         | PTE_EXEC)
 110 #define __PAGE_READONLY         __pgprot(_PTE_DEFAULT | PTE_READ)
 111 #define __PAGE_READONLY_EXEC    __pgprot(_PTE_DEFAULT | PTE_READ \
 112                                                         | PTE_EXEC)
 113 
 114 #endif /* __ASSEMBLY__ */
 115 
 116 /*
 117  * The table below defines the page protection levels that we insert into our
 118  * Linux page table version.  These get translated into the best that the
 119  * architecture can perform.  Note that on UniCore hardware:
 120  *  1) We cannot do execute protection
 121  *  2) If we could do execute protection, then read is implied
 122  *  3) write implies read permissions
 123  */
 124 #define __P000  __PAGE_NONE
 125 #define __P001  __PAGE_READONLY
 126 #define __P010  __PAGE_COPY
 127 #define __P011  __PAGE_COPY
 128 #define __P100  __PAGE_READONLY_EXEC
 129 #define __P101  __PAGE_READONLY_EXEC
 130 #define __P110  __PAGE_COPY_EXEC
 131 #define __P111  __PAGE_COPY_EXEC
 132 
 133 #define __S000  __PAGE_NONE
 134 #define __S001  __PAGE_READONLY
 135 #define __S010  __PAGE_SHARED
 136 #define __S011  __PAGE_SHARED
 137 #define __S100  __PAGE_READONLY_EXEC
 138 #define __S101  __PAGE_READONLY_EXEC
 139 #define __S110  __PAGE_SHARED_EXEC
 140 #define __S111  __PAGE_SHARED_EXEC
 141 
 142 #ifndef __ASSEMBLY__
 143 /*
 144  * ZERO_PAGE is a global shared page that is always zero: used
 145  * for zero-mapped memory areas etc..
 146  */
 147 extern struct page *empty_zero_page;
 148 #define ZERO_PAGE(vaddr)                (empty_zero_page)
 149 
 150 #define pte_pfn(pte)                    (pte_val(pte) >> PAGE_SHIFT)
 151 #define pfn_pte(pfn, prot)              (__pte(((pfn) << PAGE_SHIFT) \
 152                                                 | pgprot_val(prot)))
 153 
 154 #define pte_none(pte)                   (!pte_val(pte))
 155 #define pte_clear(mm, addr, ptep)       set_pte(ptep, __pte(0))
 156 #define pte_page(pte)                   (pfn_to_page(pte_pfn(pte)))
 157 #define pte_offset_kernel(dir, addr)    (pmd_page_vaddr(*(dir)) \
 158                                                 + __pte_index(addr))
 159 
 160 #define pte_offset_map(dir, addr)       (pmd_page_vaddr(*(dir)) \
 161                                                 + __pte_index(addr))
 162 #define pte_unmap(pte)                  do { } while (0)
 163 
 164 #define set_pte(ptep, pte)      cpu_set_pte(ptep, pte)
 165 
 166 #define set_pte_at(mm, addr, ptep, pteval)      \
 167         do {                                    \
 168                 set_pte(ptep, pteval);          \
 169         } while (0)
 170 
 171 /*
 172  * The following only work if pte_present() is true.
 173  * Undefined behaviour if not..
 174  */
 175 #define pte_present(pte)        (pte_val(pte) & PTE_PRESENT)
 176 #define pte_write(pte)          (pte_val(pte) & PTE_WRITE)
 177 #define pte_dirty(pte)          (pte_val(pte) & PTE_DIRTY)
 178 #define pte_young(pte)          (pte_val(pte) & PTE_YOUNG)
 179 #define pte_exec(pte)           (pte_val(pte) & PTE_EXEC)
 180 #define pte_special(pte)        (0)
 181 
 182 #define PTE_BIT_FUNC(fn, op) \
 183 static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
 184 
 185 PTE_BIT_FUNC(wrprotect, &= ~PTE_WRITE);
 186 PTE_BIT_FUNC(mkwrite,   |= PTE_WRITE);
 187 PTE_BIT_FUNC(mkclean,   &= ~PTE_DIRTY);
 188 PTE_BIT_FUNC(mkdirty,   |= PTE_DIRTY);
 189 PTE_BIT_FUNC(mkold,     &= ~PTE_YOUNG);
 190 PTE_BIT_FUNC(mkyoung,   |= PTE_YOUNG);
 191 
 192 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
 193 
 194 /*
 195  * Mark the prot value as uncacheable.
 196  */
 197 #define pgprot_noncached(prot)          \
 198         __pgprot(pgprot_val(prot) & ~PTE_CACHEABLE)
 199 #define pgprot_writecombine(prot)       \
 200         __pgprot(pgprot_val(prot) & ~PTE_CACHEABLE)
 201 
 202 #define pmd_none(pmd)           (!pmd_val(pmd))
 203 #define pmd_present(pmd)        (pmd_val(pmd) & PMD_PRESENT)
 204 #define pmd_bad(pmd)            (((pmd_val(pmd) &               \
 205                                 (PMD_PRESENT | PMD_TYPE_MASK))  \
 206                                 != (PMD_PRESENT | PMD_TYPE_TABLE)))
 207 
 208 #define set_pmd(pmdpd, pmdval)          \
 209         do {                            \
 210                 *(pmdpd) = pmdval;      \
 211         } while (0)
 212 
 213 #define pmd_clear(pmdp)                 \
 214         do {                            \
 215                 set_pmd(pmdp, __pmd(0));\
 216                 clean_pmd_entry(pmdp);  \
 217         } while (0)
 218 
 219 #define pmd_page_vaddr(pmd) ((pte_t *)__va(pmd_val(pmd) & PAGE_MASK))
 220 #define pmd_page(pmd)           pfn_to_page(__phys_to_pfn(pmd_val(pmd)))
 221 
 222 /*
 223  * Conversion functions: convert a page and protection to a page entry,
 224  * and a page entry and page directory to the page they refer to.
 225  */
 226 #define mk_pte(page, prot)      pfn_pte(page_to_pfn(page), prot)
 227 
 228 /* to find an entry in a page-table-directory */
 229 #define pgd_index(addr)         ((addr) >> PGDIR_SHIFT)
 230 
 231 #define pgd_offset(mm, addr)    ((mm)->pgd+pgd_index(addr))
 232 
 233 /* to find an entry in a kernel page-table-directory */
 234 #define pgd_offset_k(addr)      pgd_offset(&init_mm, addr)
 235 
 236 /* Find an entry in the third-level page table.. */
 237 #define __pte_index(addr)       (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 238 
 239 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 240 {
 241         const unsigned long mask = PTE_EXEC | PTE_WRITE | PTE_READ;
 242         pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
 243         return pte;
 244 }
 245 
 246 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 247 
 248 /*
 249  * Encode and decode a swap entry.  Swap entries are stored in the Linux
 250  * page tables as follows:
 251  *
 252  *   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
 253  *   1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 254  *   <--------------- offset --------------> <--- type --> 0 0 0 0 0
 255  *
 256  * This gives us up to 127 swap files and 32GB per swap file.  Note that
 257  * the offset field is always non-zero.
 258  */
 259 #define __SWP_TYPE_SHIFT        5
 260 #define __SWP_TYPE_BITS         7
 261 #define __SWP_TYPE_MASK         ((1 << __SWP_TYPE_BITS) - 1)
 262 #define __SWP_OFFSET_SHIFT      (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
 263 
 264 #define __swp_type(x)           (((x).val >> __SWP_TYPE_SHIFT)          \
 265                                 & __SWP_TYPE_MASK)
 266 #define __swp_offset(x)         ((x).val >> __SWP_OFFSET_SHIFT)
 267 #define __swp_entry(type, offset) ((swp_entry_t) {                      \
 268                                 ((type) << __SWP_TYPE_SHIFT) |          \
 269                                 ((offset) << __SWP_OFFSET_SHIFT) })
 270 
 271 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 272 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
 273 
 274 /*
 275  * It is an error for the kernel to have more swap files than we can
 276  * encode in the PTEs.  This ensures that we know when MAX_SWAPFILES
 277  * is increased beyond what we presently support.
 278  */
 279 #define MAX_SWAPFILES_CHECK()   \
 280         BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
 281 
 282 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 283 /* FIXME: this is not correct */
 284 #define kern_addr_valid(addr)   (1)
 285 
 286 #include <asm-generic/pgtable.h>
 287 
 288 #endif /* !__ASSEMBLY__ */
 289 
 290 #endif /* __UNICORE_PGTABLE_H__ */
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root/arch/unicore32/include/asm/pgtable.h

INCLUDED FROM

DEFINITIONS
