Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 1 | #ifndef __ASM_SH_PGTABLE_32_H |
| 2 | #define __ASM_SH_PGTABLE_32_H |
| 3 | |
| 4 | /* |
| 5 | * Linux PTEL encoding. |
| 6 | * |
| 7 | * Hardware and software bit definitions for the PTEL value (see below for |
| 8 | * notes on SH-X2 MMUs and 64-bit PTEs): |
| 9 | * |
| 10 | * - Bits 0 and 7 are reserved on SH-3 (_PAGE_WT and _PAGE_SZ1 on SH-4). |
| 11 | * |
| 12 | * - Bit 1 is the SH-bit, but is unused on SH-3 due to an MMU bug (the |
| 13 | * hardware PTEL value can't have the SH-bit set when MMUCR.IX is set, |
| 14 | * which is the default in cpu-sh3/mmu_context.h:MMU_CONTROL_INIT). |
| 15 | * |
| 16 | * In order to keep this relatively clean, do not use these for defining |
| 17 | * SH-3 specific flags until all of the other unused bits have been |
| 18 | * exhausted. |
| 19 | * |
| 20 | * - Bit 9 is reserved by everyone and used by _PAGE_PROTNONE. |
| 21 | * |
| 22 | * - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages. |
Paul Mundt | c0b96cf6 | 2009-07-22 16:50:57 +0900 | [diff] [blame] | 23 | * Bit 10 is used for _PAGE_ACCESSED, and bit 11 is used for _PAGE_SPECIAL. |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 24 | * |
Stuart Menefy | fc55888 | 2007-11-30 18:05:18 +0900 | [diff] [blame] | 25 | * - On 29 bit platforms, bits 31 to 29 are used for the space attributes |
| 26 | * and timing control which (together with bit 0) are moved into the |
| 27 | * old-style PTEA on the parts that support it. |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 28 | * |
| 29 | * XXX: Leave the _PAGE_FILE and _PAGE_WT overhaul for a rainy day. |
| 30 | * |
| 31 | * SH-X2 MMUs and extended PTEs |
| 32 | * |
| 33 | * SH-X2 supports an extended mode TLB with split data arrays due to the |
| 34 | * number of bits needed for PR and SZ (now EPR and ESZ) encodings. The PR and |
| 35 | * SZ bit placeholders still exist in data array 1, but are implemented as |
| 36 | * reserved bits, with the real logic existing in data array 2. |
| 37 | * |
| 38 | * The downside to this is that we can no longer fit everything in to a 32-bit |
| 39 | * PTE encoding, so a 64-bit pte_t is necessary for these parts. On the plus |
| 40 | * side, this gives us quite a few spare bits to play with for future usage. |
| 41 | */ |
| 42 | /* Legacy and compat mode bits */ |
| 43 | #define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */ |
| 44 | #define _PAGE_HW_SHARED 0x002 /* SH-bit : shared among processes */ |
| 45 | #define _PAGE_DIRTY 0x004 /* D-bit : page changed */ |
| 46 | #define _PAGE_CACHABLE 0x008 /* C-bit : cachable */ |
| 47 | #define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */ |
| 48 | #define _PAGE_RW 0x020 /* PR0-bit : write access allowed */ |
| 49 | #define _PAGE_USER 0x040 /* PR1-bit : user space access allowed*/ |
| 50 | #define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */ |
| 51 | #define _PAGE_PRESENT 0x100 /* V-bit : page is valid */ |
| 52 | #define _PAGE_PROTNONE 0x200 /* software: if not present */ |
| 53 | #define _PAGE_ACCESSED 0x400 /* software: page referenced */ |
| 54 | #define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */ |
Paul Mundt | c0b96cf6 | 2009-07-22 16:50:57 +0900 | [diff] [blame] | 55 | #define _PAGE_SPECIAL 0x800 /* software: special page */ |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 56 | |
| 57 | #define _PAGE_SZ_MASK (_PAGE_SZ0 | _PAGE_SZ1) |
| 58 | #define _PAGE_PR_MASK (_PAGE_RW | _PAGE_USER) |
| 59 | |
| 60 | /* Extended mode bits */ |
| 61 | #define _PAGE_EXT_ESZ0 0x0010 /* ESZ0-bit: Size of page */ |
| 62 | #define _PAGE_EXT_ESZ1 0x0020 /* ESZ1-bit: Size of page */ |
| 63 | #define _PAGE_EXT_ESZ2 0x0040 /* ESZ2-bit: Size of page */ |
| 64 | #define _PAGE_EXT_ESZ3 0x0080 /* ESZ3-bit: Size of page */ |
| 65 | |
| 66 | #define _PAGE_EXT_USER_EXEC 0x0100 /* EPR0-bit: User space executable */ |
| 67 | #define _PAGE_EXT_USER_WRITE 0x0200 /* EPR1-bit: User space writable */ |
| 68 | #define _PAGE_EXT_USER_READ 0x0400 /* EPR2-bit: User space readable */ |
| 69 | |
| 70 | #define _PAGE_EXT_KERN_EXEC 0x0800 /* EPR3-bit: Kernel space executable */ |
| 71 | #define _PAGE_EXT_KERN_WRITE 0x1000 /* EPR4-bit: Kernel space writable */ |
| 72 | #define _PAGE_EXT_KERN_READ 0x2000 /* EPR5-bit: Kernel space readable */ |
| 73 | |
| 74 | /* Wrapper for extended mode pgprot twiddling */ |
| 75 | #define _PAGE_EXT(x) ((unsigned long long)(x) << 32) |
| 76 | |
| 77 | /* software: moves to PTEA.TC (Timing Control) */ |
| 78 | #define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */ |
| 79 | #define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */ |
| 80 | |
| 81 | /* software: moves to PTEA.SA[2:0] (Space Attributes) */ |
| 82 | #define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */ |
| 83 | #define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */ |
| 84 | #define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */ |
| 85 | #define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */ |
| 86 | #define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */ |
| 87 | #define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */ |
| 88 | #define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */ |
| 89 | |
Michael Trimarchi | 6503fe4 | 2009-08-20 13:27:44 +0900 | [diff] [blame] | 90 | #ifndef CONFIG_X2TLB |
| 91 | /* copy the ptea attributes */ |
| 92 | static inline unsigned long copy_ptea_attributes(unsigned long x) |
| 93 | { |
| 94 | return ((x >> 28) & 0xe) | (x & 0x1); |
| 95 | } |
| 96 | #endif |
| 97 | |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 98 | /* Mask which drops unused bits from the PTEL value */ |
| 99 | #if defined(CONFIG_CPU_SH3) |
| 100 | #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED| \ |
| 101 | _PAGE_FILE | _PAGE_SZ1 | \ |
| 102 | _PAGE_HW_SHARED) |
| 103 | #elif defined(CONFIG_X2TLB) |
| 104 | /* Get rid of the legacy PR/SZ bits when using extended mode */ |
| 105 | #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | \ |
| 106 | _PAGE_FILE | _PAGE_PR_MASK | _PAGE_SZ_MASK) |
| 107 | #else |
| 108 | #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE) |
| 109 | #endif |
| 110 | |
Stuart Menefy | d02b08f | 2007-11-30 17:52:53 +0900 | [diff] [blame] | 111 | #define _PAGE_FLAGS_HARDWARE_MASK (PHYS_ADDR_MASK & ~(_PAGE_CLEAR_FLAGS)) |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 112 | |
| 113 | /* Hardware flags, page size encoding */ |
Paul Mundt | 66dfe18 | 2008-06-03 18:54:02 +0900 | [diff] [blame] | 114 | #if !defined(CONFIG_MMU) |
| 115 | # define _PAGE_FLAGS_HARD 0ULL |
| 116 | #elif defined(CONFIG_X2TLB) |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 117 | # if defined(CONFIG_PAGE_SIZE_4KB) |
| 118 | # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ0) |
| 119 | # elif defined(CONFIG_PAGE_SIZE_8KB) |
| 120 | # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ1) |
| 121 | # elif defined(CONFIG_PAGE_SIZE_64KB) |
| 122 | # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ2) |
| 123 | # endif |
| 124 | #else |
| 125 | # if defined(CONFIG_PAGE_SIZE_4KB) |
| 126 | # define _PAGE_FLAGS_HARD _PAGE_SZ0 |
| 127 | # elif defined(CONFIG_PAGE_SIZE_64KB) |
| 128 | # define _PAGE_FLAGS_HARD _PAGE_SZ1 |
| 129 | # endif |
| 130 | #endif |
| 131 | |
| 132 | #if defined(CONFIG_X2TLB) |
| 133 | # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) |
| 134 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2) |
| 135 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) |
| 136 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2) |
| 137 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) |
| 138 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2) |
| 139 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) |
| 140 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ3) |
| 141 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB) |
| 142 | # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3) |
| 143 | # endif |
| 144 | #else |
| 145 | # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) |
| 146 | # define _PAGE_SZHUGE (_PAGE_SZ1) |
| 147 | # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) |
| 148 | # define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1) |
| 149 | # endif |
| 150 | #endif |
| 151 | |
| 152 | /* |
| 153 | * Stub out _PAGE_SZHUGE if we don't have a good definition for it, |
| 154 | * to make pte_mkhuge() happy. |
| 155 | */ |
| 156 | #ifndef _PAGE_SZHUGE |
| 157 | # define _PAGE_SZHUGE (_PAGE_FLAGS_HARD) |
| 158 | #endif |
| 159 | |
Paul Mundt | c0b96cf6 | 2009-07-22 16:50:57 +0900 | [diff] [blame] | 160 | /* |
| 161 | * Mask of bits that are to be preserved accross pgprot changes. |
| 162 | */ |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 163 | #define _PAGE_CHG_MASK \ |
Paul Mundt | c0b96cf6 | 2009-07-22 16:50:57 +0900 | [diff] [blame] | 164 | (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | \ |
| 165 | _PAGE_DIRTY | _PAGE_SPECIAL) |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 166 | |
| 167 | #ifndef __ASSEMBLY__ |
| 168 | |
| 169 | #if defined(CONFIG_X2TLB) /* SH-X2 TLB */ |
| 170 | #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ |
| 171 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) |
| 172 | |
| 173 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ |
| 174 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ |
| 175 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ |
| 176 | _PAGE_EXT_KERN_WRITE | \ |
| 177 | _PAGE_EXT_USER_READ | \ |
| 178 | _PAGE_EXT_USER_WRITE)) |
| 179 | |
| 180 | #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ |
| 181 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ |
| 182 | _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \ |
| 183 | _PAGE_EXT_KERN_READ | \ |
| 184 | _PAGE_EXT_USER_EXEC | \ |
| 185 | _PAGE_EXT_USER_READ)) |
| 186 | |
| 187 | #define PAGE_COPY PAGE_EXECREAD |
| 188 | |
| 189 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ |
| 190 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ |
| 191 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ |
| 192 | _PAGE_EXT_USER_READ)) |
| 193 | |
| 194 | #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ |
| 195 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ |
| 196 | _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ |
| 197 | _PAGE_EXT_USER_WRITE)) |
| 198 | |
| 199 | #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ |
| 200 | _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ |
| 201 | _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ |
| 202 | _PAGE_EXT_KERN_READ | \ |
| 203 | _PAGE_EXT_KERN_EXEC | \ |
| 204 | _PAGE_EXT_USER_WRITE | \ |
| 205 | _PAGE_EXT_USER_READ | \ |
| 206 | _PAGE_EXT_USER_EXEC)) |
| 207 | |
| 208 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ |
| 209 | _PAGE_DIRTY | _PAGE_ACCESSED | \ |
| 210 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ |
| 211 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ |
| 212 | _PAGE_EXT_KERN_WRITE | \ |
| 213 | _PAGE_EXT_KERN_EXEC)) |
| 214 | |
| 215 | #define PAGE_KERNEL_NOCACHE \ |
| 216 | __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ |
| 217 | _PAGE_ACCESSED | _PAGE_HW_SHARED | \ |
| 218 | _PAGE_FLAGS_HARD | \ |
| 219 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ |
| 220 | _PAGE_EXT_KERN_WRITE | \ |
| 221 | _PAGE_EXT_KERN_EXEC)) |
| 222 | |
| 223 | #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ |
| 224 | _PAGE_DIRTY | _PAGE_ACCESSED | \ |
| 225 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ |
| 226 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ |
| 227 | _PAGE_EXT_KERN_EXEC)) |
| 228 | |
| 229 | #define PAGE_KERNEL_PCC(slot, type) \ |
| 230 | __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ |
| 231 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ |
| 232 | _PAGE_EXT(_PAGE_EXT_KERN_READ | \ |
| 233 | _PAGE_EXT_KERN_WRITE | \ |
| 234 | _PAGE_EXT_KERN_EXEC) \ |
| 235 | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ |
| 236 | (type)) |
| 237 | |
| 238 | #elif defined(CONFIG_MMU) /* SH-X TLB */ |
| 239 | #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ |
| 240 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) |
| 241 | |
| 242 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \ |
| 243 | _PAGE_CACHABLE | _PAGE_ACCESSED | \ |
| 244 | _PAGE_FLAGS_HARD) |
| 245 | |
| 246 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ |
| 247 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) |
| 248 | |
| 249 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ |
| 250 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) |
| 251 | |
| 252 | #define PAGE_EXECREAD PAGE_READONLY |
| 253 | #define PAGE_RWX PAGE_SHARED |
| 254 | #define PAGE_WRITEONLY PAGE_SHARED |
| 255 | |
| 256 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \ |
| 257 | _PAGE_DIRTY | _PAGE_ACCESSED | \ |
| 258 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) |
| 259 | |
| 260 | #define PAGE_KERNEL_NOCACHE \ |
| 261 | __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ |
| 262 | _PAGE_ACCESSED | _PAGE_HW_SHARED | \ |
| 263 | _PAGE_FLAGS_HARD) |
| 264 | |
| 265 | #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ |
| 266 | _PAGE_DIRTY | _PAGE_ACCESSED | \ |
| 267 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) |
| 268 | |
| 269 | #define PAGE_KERNEL_PCC(slot, type) \ |
| 270 | __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ |
| 271 | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ |
| 272 | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ |
| 273 | (type)) |
| 274 | #else /* no mmu */ |
| 275 | #define PAGE_NONE __pgprot(0) |
| 276 | #define PAGE_SHARED __pgprot(0) |
| 277 | #define PAGE_COPY __pgprot(0) |
| 278 | #define PAGE_EXECREAD __pgprot(0) |
| 279 | #define PAGE_RWX __pgprot(0) |
| 280 | #define PAGE_READONLY __pgprot(0) |
| 281 | #define PAGE_WRITEONLY __pgprot(0) |
| 282 | #define PAGE_KERNEL __pgprot(0) |
| 283 | #define PAGE_KERNEL_NOCACHE __pgprot(0) |
| 284 | #define PAGE_KERNEL_RO __pgprot(0) |
| 285 | |
| 286 | #define PAGE_KERNEL_PCC(slot, type) \ |
| 287 | __pgprot(0) |
| 288 | #endif |
| 289 | |
| 290 | #endif /* __ASSEMBLY__ */ |
| 291 | |
| 292 | #ifndef __ASSEMBLY__ |
| 293 | |
| 294 | /* |
| 295 | * Certain architectures need to do special things when PTEs |
| 296 | * within a page table are directly modified. Thus, the following |
| 297 | * hook is made available. |
| 298 | */ |
| 299 | #ifdef CONFIG_X2TLB |
| 300 | static inline void set_pte(pte_t *ptep, pte_t pte) |
| 301 | { |
| 302 | ptep->pte_high = pte.pte_high; |
| 303 | smp_wmb(); |
| 304 | ptep->pte_low = pte.pte_low; |
| 305 | } |
| 306 | #else |
| 307 | #define set_pte(pteptr, pteval) (*(pteptr) = pteval) |
| 308 | #endif |
| 309 | |
| 310 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) |
| 311 | |
| 312 | /* |
| 313 | * (pmds are folded into pgds so this doesn't get actually called, |
| 314 | * but the define is needed for a generic inline function.) |
| 315 | */ |
| 316 | #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) |
| 317 | |
| 318 | #define pfn_pte(pfn, prot) \ |
| 319 | __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) |
| 320 | #define pfn_pmd(pfn, prot) \ |
| 321 | __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) |
| 322 | |
| 323 | #define pte_none(x) (!pte_val(x)) |
| 324 | #define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE)) |
| 325 | |
| 326 | #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) |
| 327 | |
| 328 | #define pmd_none(x) (!pmd_val(x)) |
| 329 | #define pmd_present(x) (pmd_val(x)) |
| 330 | #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0) |
| 331 | #define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK) |
| 332 | |
| 333 | #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) |
| 334 | #define pte_page(x) pfn_to_page(pte_pfn(x)) |
| 335 | |
| 336 | /* |
| 337 | * The following only work if pte_present() is true. |
| 338 | * Undefined behaviour if not.. |
| 339 | */ |
| 340 | #define pte_not_present(pte) (!((pte).pte_low & _PAGE_PRESENT)) |
| 341 | #define pte_dirty(pte) ((pte).pte_low & _PAGE_DIRTY) |
| 342 | #define pte_young(pte) ((pte).pte_low & _PAGE_ACCESSED) |
| 343 | #define pte_file(pte) ((pte).pte_low & _PAGE_FILE) |
Paul Mundt | c0b96cf6 | 2009-07-22 16:50:57 +0900 | [diff] [blame] | 344 | #define pte_special(pte) ((pte).pte_low & _PAGE_SPECIAL) |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 345 | |
| 346 | #ifdef CONFIG_X2TLB |
| 347 | #define pte_write(pte) ((pte).pte_high & _PAGE_EXT_USER_WRITE) |
| 348 | #else |
| 349 | #define pte_write(pte) ((pte).pte_low & _PAGE_RW) |
| 350 | #endif |
| 351 | |
| 352 | #define PTE_BIT_FUNC(h,fn,op) \ |
| 353 | static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; } |
| 354 | |
| 355 | #ifdef CONFIG_X2TLB |
| 356 | /* |
| 357 | * We cheat a bit in the SH-X2 TLB case. As the permission bits are |
| 358 | * individually toggled (and user permissions are entirely decoupled from |
| 359 | * kernel permissions), we attempt to couple them a bit more sanely here. |
| 360 | */ |
| 361 | PTE_BIT_FUNC(high, wrprotect, &= ~_PAGE_EXT_USER_WRITE); |
| 362 | PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE); |
| 363 | PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE); |
| 364 | #else |
| 365 | PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW); |
| 366 | PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW); |
| 367 | PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE); |
| 368 | #endif |
| 369 | |
| 370 | PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY); |
| 371 | PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY); |
| 372 | PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED); |
| 373 | PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED); |
Paul Mundt | c0b96cf6 | 2009-07-22 16:50:57 +0900 | [diff] [blame] | 374 | PTE_BIT_FUNC(low, mkspecial, |= _PAGE_SPECIAL); |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 375 | |
Paul Mundt | c0b96cf6 | 2009-07-22 16:50:57 +0900 | [diff] [blame] | 376 | #define __HAVE_ARCH_PTE_SPECIAL |
Nick Piggin | 7e67513 | 2008-04-28 02:13:00 -0700 | [diff] [blame] | 377 | |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 378 | /* |
| 379 | * Macro and implementation to make a page protection as uncachable. |
| 380 | */ |
| 381 | #define pgprot_writecombine(prot) \ |
| 382 | __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE) |
| 383 | |
| 384 | #define pgprot_noncached pgprot_writecombine |
| 385 | |
| 386 | /* |
| 387 | * Conversion functions: convert a page and protection to a page entry, |
| 388 | * and a page entry and page directory to the page they refer to. |
| 389 | * |
| 390 | * extern pte_t mk_pte(struct page *page, pgprot_t pgprot) |
| 391 | */ |
| 392 | #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) |
| 393 | |
| 394 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
| 395 | { |
| 396 | pte.pte_low &= _PAGE_CHG_MASK; |
| 397 | pte.pte_low |= pgprot_val(newprot); |
| 398 | |
| 399 | #ifdef CONFIG_X2TLB |
| 400 | pte.pte_high |= pgprot_val(newprot) >> 32; |
| 401 | #endif |
| 402 | |
| 403 | return pte; |
| 404 | } |
| 405 | |
| 406 | #define pmd_page_vaddr(pmd) ((unsigned long)pmd_val(pmd)) |
| 407 | #define pmd_page(pmd) (virt_to_page(pmd_val(pmd))) |
| 408 | |
| 409 | /* to find an entry in a page-table-directory. */ |
| 410 | #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) |
Paul Mundt | 0906a3a | 2009-09-03 17:21:10 +0900 | [diff] [blame^] | 411 | #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) |
| 412 | #define __pgd_offset(address) pgd_index(address) |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 413 | |
| 414 | /* to find an entry in a kernel page-table-directory */ |
| 415 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) |
| 416 | |
Paul Mundt | 0906a3a | 2009-09-03 17:21:10 +0900 | [diff] [blame^] | 417 | #define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) |
| 418 | #define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) |
| 419 | |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 420 | /* Find an entry in the third-level page table.. */ |
| 421 | #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) |
Paul Mundt | 0906a3a | 2009-09-03 17:21:10 +0900 | [diff] [blame^] | 422 | #define __pte_offset(address) pte_index(address) |
| 423 | |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 424 | #define pte_offset_kernel(dir, address) \ |
| 425 | ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address)) |
| 426 | #define pte_offset_map(dir, address) pte_offset_kernel(dir, address) |
| 427 | #define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address) |
| 428 | |
| 429 | #define pte_unmap(pte) do { } while (0) |
| 430 | #define pte_unmap_nested(pte) do { } while (0) |
| 431 | |
| 432 | #ifdef CONFIG_X2TLB |
| 433 | #define pte_ERROR(e) \ |
| 434 | printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \ |
| 435 | &(e), (e).pte_high, (e).pte_low) |
| 436 | #define pgd_ERROR(e) \ |
| 437 | printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e)) |
| 438 | #else |
| 439 | #define pte_ERROR(e) \ |
| 440 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) |
| 441 | #define pgd_ERROR(e) \ |
| 442 | printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) |
| 443 | #endif |
| 444 | |
| 445 | /* |
| 446 | * Encode and de-code a swap entry |
| 447 | * |
| 448 | * Constraints: |
| 449 | * _PAGE_FILE at bit 0 |
| 450 | * _PAGE_PRESENT at bit 8 |
| 451 | * _PAGE_PROTNONE at bit 9 |
| 452 | * |
| 453 | * For the normal case, we encode the swap type into bits 0:7 and the |
| 454 | * swap offset into bits 10:30. For the 64-bit PTE case, we keep the |
| 455 | * preserved bits in the low 32-bits and use the upper 32 as the swap |
| 456 | * offset (along with a 5-bit type), following the same approach as x86 |
| 457 | * PAE. This keeps the logic quite simple, and allows for a full 32 |
| 458 | * PTE_FILE_MAX_BITS, as opposed to the 29-bits we're constrained with |
| 459 | * in the pte_low case. |
| 460 | * |
| 461 | * As is evident by the Alpha code, if we ever get a 64-bit unsigned |
| 462 | * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes |
| 463 | * much cleaner.. |
| 464 | * |
| 465 | * NOTE: We should set ZEROs at the position of _PAGE_PRESENT |
| 466 | * and _PAGE_PROTNONE bits |
| 467 | */ |
| 468 | #ifdef CONFIG_X2TLB |
| 469 | #define __swp_type(x) ((x).val & 0x1f) |
| 470 | #define __swp_offset(x) ((x).val >> 5) |
| 471 | #define __swp_entry(type, offset) ((swp_entry_t){ (type) | (offset) << 5}) |
| 472 | #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high }) |
| 473 | #define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val }) |
| 474 | |
| 475 | /* |
| 476 | * Encode and decode a nonlinear file mapping entry |
| 477 | */ |
| 478 | #define pte_to_pgoff(pte) ((pte).pte_high) |
| 479 | #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) }) |
| 480 | |
| 481 | #define PTE_FILE_MAX_BITS 32 |
| 482 | #else |
| 483 | #define __swp_type(x) ((x).val & 0xff) |
| 484 | #define __swp_offset(x) ((x).val >> 10) |
| 485 | #define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) <<10}) |
| 486 | |
| 487 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 }) |
| 488 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 }) |
| 489 | |
| 490 | /* |
| 491 | * Encode and decode a nonlinear file mapping entry |
| 492 | */ |
| 493 | #define PTE_FILE_MAX_BITS 29 |
| 494 | #define pte_to_pgoff(pte) (pte_val(pte) >> 1) |
| 495 | #define pgoff_to_pte(off) ((pte_t) { ((off) << 1) | _PAGE_FILE }) |
| 496 | #endif |
| 497 | |
| 498 | #endif /* __ASSEMBLY__ */ |
| 499 | #endif /* __ASM_SH_PGTABLE_32_H */ |