1#ifdef __KERNEL__ 2#ifndef _PPC_PGTABLE_H 3#define _PPC_PGTABLE_H 4 5#include <asm-generic/4level-fixup.h> 6 7 8#ifndef __ASSEMBLY__ 9#include <linux/sched.h> 10#include <linux/threads.h> 11#include <asm/processor.h> /* For TASK_SIZE */ 12#include <asm/mmu.h> 13#include <asm/page.h> 14#include <asm/io.h> /* For sub-arch specific PPC_PIN_SIZE */ 15struct mm_struct; 16 17extern unsigned long va_to_phys(unsigned long address); 18extern pte_t *va_to_pte(unsigned long address); 19extern unsigned long ioremap_bot, ioremap_base; 20#endif /* __ASSEMBLY__ */ 21 22/* 23 * The PowerPC MMU uses a hash table containing PTEs, together with 24 * a set of 16 segment registers (on 32-bit implementations), to define 25 * the virtual to physical address mapping. 26 * 27 * We use the hash table as an extended TLB, i.e. a cache of currently 28 * active mappings. We maintain a two-level page table tree, much 29 * like that used by the i386, for the sake of the Linux memory 30 * management code. Low-level assembler code in hashtable.S 31 * (procedure hash_page) is responsible for extracting ptes from the 32 * tree and putting them into the hash table when necessary, and 33 * updating the accessed and modified bits in the page table tree. 34 */ 35 36/* 37 * The PowerPC MPC8xx uses a TLB with hardware assisted, software tablewalk. 38 * We also use the two level tables, but we can put the real bits in them 39 * needed for the TLB and tablewalk. These definitions require Mx_CTR.PPM = 0, 40 * Mx_CTR.PPCS = 0, and MD_CTR.TWAM = 1. The level 2 descriptor has 41 * additional page protection (when Mx_CTR.PPCS = 1) that allows TLB hit 42 * based upon user/super access. The TLB does not have accessed nor write 43 * protect. We assume that if the TLB get loaded with an entry it is 44 * accessed, and overload the changed bit for write protect. We use 45 * two bits in the software pte that are supposed to be set to zero in 46 * the TLB entry (24 and 25) for these indicators. Although the level 1 47 * descriptor contains the guarded and writethrough/copyback bits, we can 48 * set these at the page level since they get copied from the Mx_TWC 49 * register when the TLB entry is loaded. We will use bit 27 for guard, since 50 * that is where it exists in the MD_TWC, and bit 26 for writethrough. 51 * These will get masked from the level 2 descriptor at TLB load time, and 52 * copied to the MD_TWC before it gets loaded. 53 * Large page sizes added. We currently support two sizes, 4K and 8M. 54 * This also allows a TLB hander optimization because we can directly 55 * load the PMD into MD_TWC. The 8M pages are only used for kernel 56 * mapping of well known areas. The PMD (PGD) entries contain control 57 * flags in addition to the address, so care must be taken that the 58 * software no longer assumes these are only pointers. 59 */ 60 61/* 62 * At present, all PowerPC 400-class processors share a similar TLB 63 * architecture. The instruction and data sides share a unified, 64 * 64-entry, fully-associative TLB which is maintained totally under 65 * software control. In addition, the instruction side has a 66 * hardware-managed, 4-entry, fully-associative TLB which serves as a 67 * first level to the shared TLB. These two TLBs are known as the UTLB 68 * and ITLB, respectively (see "mmu.h" for definitions). 69 */ 70 71/* 72 * The normal case is that PTEs are 32-bits and we have a 1-page 73 * 1024-entry pgdir pointing to 1-page 1024-entry PTE pages. -- paulus 74 * 75 * For any >32-bit physical address platform, we can use the following 76 * two level page table layout where the pgdir is 8KB and the MS 13 bits 77 * are an index to the second level table. The combined pgdir/pmd first 78 * level has 2048 entries and the second level has 512 64-bit PTE entries. 79 * -Matt 80 */ 81/* PMD_SHIFT determines the size of the area mapped by the PTE pages */ 82#define PMD_SHIFT (PAGE_SHIFT + PTE_SHIFT) 83#define PMD_SIZE (1UL << PMD_SHIFT) 84#define PMD_MASK (~(PMD_SIZE-1)) 85 86/* PGDIR_SHIFT determines what a top-level page table entry can map */ 87#define PGDIR_SHIFT PMD_SHIFT 88#define PGDIR_SIZE (1UL << PGDIR_SHIFT) 89#define PGDIR_MASK (~(PGDIR_SIZE-1)) 90 91/* 92 * entries per page directory level: our page-table tree is two-level, so 93 * we don't really have any PMD directory. 94 */ 95#define PTRS_PER_PTE (1 << PTE_SHIFT) 96#define PTRS_PER_PMD 1 97#define PTRS_PER_PGD (1 << (32 - PGDIR_SHIFT)) 98 99#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) 100#define FIRST_USER_ADDRESS 0 101 102#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT) 103#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS) 104 105#define pte_ERROR(e) \ 106 printk("%s:%d: bad pte "PTE_FMT".\n", __FILE__, __LINE__, pte_val(e)) 107#define pmd_ERROR(e) \ 108 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) 109#define pgd_ERROR(e) \ 110 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 111 112/* 113 * Just any arbitrary offset to the start of the vmalloc VM area: the 114 * current 64MB value just means that there will be a 64MB "hole" after the 115 * physical memory until the kernel virtual memory starts. That means that 116 * any out-of-bounds memory accesses will hopefully be caught. 117 * The vmalloc() routines leaves a hole of 4kB between each vmalloced 118 * area for the same reason. ;) 119 * 120 * We no longer map larger than phys RAM with the BATs so we don't have 121 * to worry about the VMALLOC_OFFSET causing problems. We do have to worry 122 * about clashes between our early calls to ioremap() that start growing down 123 * from ioremap_base being run into the VM area allocations (growing upwards 124 * from VMALLOC_START). For this reason we have ioremap_bot to check when 125 * we actually run into our mappings setup in the early boot with the VM 126 * system. This really does become a problem for machines with good amounts 127 * of RAM. -- Cort 128 */ 129#define VMALLOC_OFFSET (0x1000000) /* 16M */ 130#ifdef PPC_PIN_SIZE 131#define VMALLOC_START (((_ALIGN((long)high_memory, PPC_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))) 132#else 133#define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))) 134#endif 135#define VMALLOC_END ioremap_bot 136 137/* 138 * Bits in a linux-style PTE. These match the bits in the 139 * (hardware-defined) PowerPC PTE as closely as possible. 140 */ 141 142#if defined(CONFIG_40x) 143 144/* There are several potential gotchas here. The 40x hardware TLBLO 145 field looks like this: 146 147 0 1 2 3 4 ... 18 19 20 21 22 23 24 25 26 27 28 29 30 31 148 RPN..................... 0 0 EX WR ZSEL....... W I M G 149 150 Where possible we make the Linux PTE bits match up with this 151 152 - bits 20 and 21 must be cleared, because we use 4k pages (40x can 153 support down to 1k pages), this is done in the TLBMiss exception 154 handler. 155 - We use only zones 0 (for kernel pages) and 1 (for user pages) 156 of the 16 available. Bit 24-26 of the TLB are cleared in the TLB 157 miss handler. Bit 27 is PAGE_USER, thus selecting the correct 158 zone. 159 - PRESENT *must* be in the bottom two bits because swap cache 160 entries use the top 30 bits. Because 40x doesn't support SMP 161 anyway, M is irrelevant so we borrow it for PAGE_PRESENT. Bit 30 162 is cleared in the TLB miss handler before the TLB entry is loaded. 163 - All other bits of the PTE are loaded into TLBLO without 164 modification, leaving us only the bits 20, 21, 24, 25, 26, 30 for 165 software PTE bits. We actually use use bits 21, 24, 25, and 166 30 respectively for the software bits: ACCESSED, DIRTY, RW, and 167 PRESENT. 168*/ 169 170/* Definitions for 40x embedded chips. */ 171#define _PAGE_GUARDED 0x001 /* G: page is guarded from prefetch */ 172#define _PAGE_FILE 0x001 /* when !present: nonlinear file mapping */ 173#define _PAGE_PRESENT 0x002 /* software: PTE contains a translation */ 174#define _PAGE_NO_CACHE 0x004 /* I: caching is inhibited */ 175#define _PAGE_WRITETHRU 0x008 /* W: caching is write-through */ 176#define _PAGE_USER 0x010 /* matches one of the zone permission bits */ 177#define _PAGE_RW 0x040 /* software: Writes permitted */ 178#define _PAGE_DIRTY 0x080 /* software: dirty page */ 179#define _PAGE_HWWRITE 0x100 /* hardware: Dirty & RW, set in exception */ 180#define _PAGE_HWEXEC 0x200 /* hardware: EX permission */ 181#define _PAGE_ACCESSED 0x400 /* software: R: page referenced */ 182 183#define _PMD_PRESENT 0x400 /* PMD points to page of PTEs */ 184#define _PMD_BAD 0x802 185#define _PMD_SIZE 0x0e0 /* size field, != 0 for large-page PMD entry */ 186#define _PMD_SIZE_4M 0x0c0 187#define _PMD_SIZE_16M 0x0e0 188#define PMD_PAGE_SIZE(pmdval) (1024 << (((pmdval) & _PMD_SIZE) >> 4)) 189 190#elif defined(CONFIG_44x) 191/* 192 * Definitions for PPC440 193 * 194 * Because of the 3 word TLB entries to support 36-bit addressing, 195 * the attribute are difficult to map in such a fashion that they 196 * are easily loaded during exception processing. I decided to 197 * organize the entry so the ERPN is the only portion in the 198 * upper word of the PTE and the attribute bits below are packed 199 * in as sensibly as they can be in the area below a 4KB page size 200 * oriented RPN. This at least makes it easy to load the RPN and 201 * ERPN fields in the TLB. -Matt 202 * 203 * Note that these bits preclude future use of a page size 204 * less than 4KB. 205 * 206 * 207 * PPC 440 core has following TLB attribute fields; 208 * 209 * TLB1: 210 * 0 1 2 3 4 ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 211 * RPN................................. - - - - - - ERPN....... 212 * 213 * TLB2: 214 * 0 1 2 3 4 ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 215 * - - - - - - U0 U1 U2 U3 W I M G E - UX UW UR SX SW SR 216 * 217 * There are some constrains and options, to decide mapping software bits 218 * into TLB entry. 219 * 220 * - PRESENT *must* be in the bottom three bits because swap cache 221 * entries use the top 29 bits for TLB2. 222 * 223 * - FILE *must* be in the bottom three bits because swap cache 224 * entries use the top 29 bits for TLB2. 225 * 226 * - CACHE COHERENT bit (M) has no effect on PPC440 core, because it 227 * doesn't support SMP. So we can use this as software bit, like 228 * DIRTY. 229 * 230 * With the PPC 44x Linux implementation, the 0-11th LSBs of the PTE are used 231 * for memory protection related functions (see PTE structure in 232 * include/asm-ppc/mmu.h). The _PAGE_XXX definitions in this file map to the 233 * above bits. Note that the bit values are CPU specific, not architecture 234 * specific. 235 * 236 * The kernel PTE entry holds an arch-dependent swp_entry structure under 237 * certain situations. In other words, in such situations some portion of 238 * the PTE bits are used as a swp_entry. In the PPC implementation, the 239 * 3-24th LSB are shared with swp_entry, however the 0-2nd three LSB still 240 * hold protection values. That means the three protection bits are 241 * reserved for both PTE and SWAP entry at the most significant three 242 * LSBs. 243 * 244 * There are three protection bits available for SWAP entry: 245 * _PAGE_PRESENT 246 * _PAGE_FILE 247 * _PAGE_HASHPTE (if HW has) 248 * 249 * So those three bits have to be inside of 0-2nd LSB of PTE. 250 * 251 */ 252 253#define _PAGE_PRESENT 0x00000001 /* S: PTE valid */ 254#define _PAGE_RW 0x00000002 /* S: Write permission */ 255#define _PAGE_FILE 0x00000004 /* S: nonlinear file mapping */ 256#define _PAGE_ACCESSED 0x00000008 /* S: Page referenced */ 257#define _PAGE_HWWRITE 0x00000010 /* H: Dirty & RW */ 258#define _PAGE_HWEXEC 0x00000020 /* H: Execute permission */ 259#define _PAGE_USER 0x00000040 /* S: User page */ 260#define _PAGE_ENDIAN 0x00000080 /* H: E bit */ 261#define _PAGE_GUARDED 0x00000100 /* H: G bit */ 262#define _PAGE_DIRTY 0x00000200 /* S: Page dirty */ 263#define _PAGE_NO_CACHE 0x00000400 /* H: I bit */ 264#define _PAGE_WRITETHRU 0x00000800 /* H: W bit */ 265 266/* TODO: Add large page lowmem mapping support */ 267#define _PMD_PRESENT 0 268#define _PMD_PRESENT_MASK (PAGE_MASK) 269#define _PMD_BAD (~PAGE_MASK) 270 271/* ERPN in a PTE never gets cleared, ignore it */ 272#define _PTE_NONE_MASK 0xffffffff00000000ULL 273 274#elif defined(CONFIG_FSL_BOOKE) 275/* 276 MMU Assist Register 3: 277 278 32 33 34 35 36 ... 50 51 52 53 54 55 56 57 58 59 60 61 62 63 279 RPN...................... 0 0 U0 U1 U2 U3 UX SX UW SW UR SR 280 281 - PRESENT *must* be in the bottom three bits because swap cache 282 entries use the top 29 bits. 283 284 - FILE *must* be in the bottom three bits because swap cache 285 entries use the top 29 bits. 286*/ 287 288/* Definitions for FSL Book-E Cores */ 289#define _PAGE_PRESENT 0x00001 /* S: PTE contains a translation */ 290#define _PAGE_USER 0x00002 /* S: User page (maps to UR) */ 291#define _PAGE_FILE 0x00002 /* S: when !present: nonlinear file mapping */ 292#define _PAGE_ACCESSED 0x00004 /* S: Page referenced */ 293#define _PAGE_HWWRITE 0x00008 /* H: Dirty & RW, set in exception */ 294#define _PAGE_RW 0x00010 /* S: Write permission */ 295#define _PAGE_HWEXEC 0x00020 /* H: UX permission */ 296 297#define _PAGE_ENDIAN 0x00040 /* H: E bit */ 298#define _PAGE_GUARDED 0x00080 /* H: G bit */ 299#define _PAGE_COHERENT 0x00100 /* H: M bit */ 300#define _PAGE_NO_CACHE 0x00200 /* H: I bit */ 301#define _PAGE_WRITETHRU 0x00400 /* H: W bit */ 302 303#ifdef CONFIG_PTE_64BIT 304#define _PAGE_DIRTY 0x08000 /* S: Page dirty */ 305 306/* ERPN in a PTE never gets cleared, ignore it */ 307#define _PTE_NONE_MASK 0xffffffffffff0000ULL 308#else 309#define _PAGE_DIRTY 0x00800 /* S: Page dirty */ 310#endif 311 312#define _PMD_PRESENT 0 313#define _PMD_PRESENT_MASK (PAGE_MASK) 314#define _PMD_BAD (~PAGE_MASK) 315 316#elif defined(CONFIG_8xx) 317/* Definitions for 8xx embedded chips. */ 318#define _PAGE_PRESENT 0x0001 /* Page is valid */ 319#define _PAGE_FILE 0x0002 /* when !present: nonlinear file mapping */ 320#define _PAGE_NO_CACHE 0x0002 /* I: cache inhibit */ 321#define _PAGE_SHARED 0x0004 /* No ASID (context) compare */ 322 323/* These five software bits must be masked out when the entry is loaded 324 * into the TLB. 325 */ 326#define _PAGE_EXEC 0x0008 /* software: i-cache coherency required */ 327#define _PAGE_GUARDED 0x0010 /* software: guarded access */ 328#define _PAGE_DIRTY 0x0020 /* software: page changed */ 329#define _PAGE_RW 0x0040 /* software: user write access allowed */ 330#define _PAGE_ACCESSED 0x0080 /* software: page referenced */ 331 332/* Setting any bits in the nibble with the follow two controls will 333 * require a TLB exception handler change. It is assumed unused bits 334 * are always zero. 335 */ 336#define _PAGE_HWWRITE 0x0100 /* h/w write enable: never set in Linux PTE */ 337#define _PAGE_USER 0x0800 /* One of the PP bits, the other is USER&~RW */ 338 339#define _PMD_PRESENT 0x0001 340#define _PMD_BAD 0x0ff0 341#define _PMD_PAGE_MASK 0x000c 342#define _PMD_PAGE_8M 0x000c 343 344/* 345 * The 8xx TLB miss handler allegedly sets _PAGE_ACCESSED in the PTE 346 * for an address even if _PAGE_PRESENT is not set, as a performance 347 * optimization. This is a bug if you ever want to use swap unless 348 * _PAGE_ACCESSED is 2, which it isn't, or unless you have 8xx-specific 349 * definitions for __swp_entry etc. below, which would be gross. 350 * -- paulus 351 */ 352#define _PTE_NONE_MASK _PAGE_ACCESSED 353 354#else /* CONFIG_6xx */ 355/* Definitions for 60x, 740/750, etc. */ 356#define _PAGE_PRESENT 0x001 /* software: pte contains a translation */ 357#define _PAGE_HASHPTE 0x002 /* hash_page has made an HPTE for this pte */ 358#define _PAGE_FILE 0x004 /* when !present: nonlinear file mapping */ 359#define _PAGE_USER 0x004 /* usermode access allowed */ 360#define _PAGE_GUARDED 0x008 /* G: prohibit speculative access */ 361#define _PAGE_COHERENT 0x010 /* M: enforce memory coherence (SMP systems) */ 362#define _PAGE_NO_CACHE 0x020 /* I: cache inhibit */ 363#define _PAGE_WRITETHRU 0x040 /* W: cache write-through */ 364#define _PAGE_DIRTY 0x080 /* C: page changed */ 365#define _PAGE_ACCESSED 0x100 /* R: page referenced */ 366#define _PAGE_EXEC 0x200 /* software: i-cache coherency required */ 367#define _PAGE_RW 0x400 /* software: user write access allowed */ 368 369#define _PTE_NONE_MASK _PAGE_HASHPTE 370 371#define _PMD_PRESENT 0 372#define _PMD_PRESENT_MASK (PAGE_MASK) 373#define _PMD_BAD (~PAGE_MASK) 374#endif 375 376/* 377 * Some bits are only used on some cpu families... 378 */ 379#ifndef _PAGE_HASHPTE 380#define _PAGE_HASHPTE 0 381#endif 382#ifndef _PTE_NONE_MASK 383#define _PTE_NONE_MASK 0 384#endif 385#ifndef _PAGE_SHARED 386#define _PAGE_SHARED 0 387#endif 388#ifndef _PAGE_HWWRITE 389#define _PAGE_HWWRITE 0 390#endif 391#ifndef _PAGE_HWEXEC 392#define _PAGE_HWEXEC 0 393#endif 394#ifndef _PAGE_EXEC 395#define _PAGE_EXEC 0 396#endif 397#ifndef _PMD_PRESENT_MASK 398#define _PMD_PRESENT_MASK _PMD_PRESENT 399#endif 400#ifndef _PMD_SIZE 401#define _PMD_SIZE 0 402#define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE() 403#endif 404 405#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) 406 407/* 408 * Note: the _PAGE_COHERENT bit automatically gets set in the hardware 409 * PTE if CONFIG_SMP is defined (hash_page does this); there is no need 410 * to have it in the Linux PTE, and in fact the bit could be reused for 411 * another purpose. -- paulus. 412 */ 413 414#ifdef CONFIG_44x 415#define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_GUARDED) 416#else 417#define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED) 418#endif 419#define _PAGE_WRENABLE (_PAGE_RW | _PAGE_DIRTY | _PAGE_HWWRITE) 420#define _PAGE_KERNEL (_PAGE_BASE | _PAGE_SHARED | _PAGE_WRENABLE) 421 422#ifdef CONFIG_PPC_STD_MMU 423/* On standard PPC MMU, no user access implies kernel read/write access, 424 * so to write-protect kernel memory we must turn on user access */ 425#define _PAGE_KERNEL_RO (_PAGE_BASE | _PAGE_SHARED | _PAGE_USER) 426#else 427#define _PAGE_KERNEL_RO (_PAGE_BASE | _PAGE_SHARED) 428#endif 429 430#define _PAGE_IO (_PAGE_KERNEL | _PAGE_NO_CACHE | _PAGE_GUARDED) 431#define _PAGE_RAM (_PAGE_KERNEL | _PAGE_HWEXEC) 432 433#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) 434/* We want the debuggers to be able to set breakpoints anywhere, so 435 * don't write protect the kernel text */ 436#define _PAGE_RAM_TEXT _PAGE_RAM 437#else 438#define _PAGE_RAM_TEXT (_PAGE_KERNEL_RO | _PAGE_HWEXEC) 439#endif 440 441#define PAGE_NONE __pgprot(_PAGE_BASE) 442#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER) 443#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC) 444#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW) 445#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC) 446#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER) 447#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC) 448 449#define PAGE_KERNEL __pgprot(_PAGE_RAM) 450#define PAGE_KERNEL_NOCACHE __pgprot(_PAGE_IO) 451 452/* 453 * The PowerPC can only do execute protection on a segment (256MB) basis, 454 * not on a page basis. So we consider execute permission the same as read. 455 * Also, write permissions imply read permissions. 456 * This is the closest we can get.. 457 */ 458#define __P000 PAGE_NONE 459#define __P001 PAGE_READONLY_X 460#define __P010 PAGE_COPY 461#define __P011 PAGE_COPY_X 462#define __P100 PAGE_READONLY 463#define __P101 PAGE_READONLY_X 464#define __P110 PAGE_COPY 465#define __P111 PAGE_COPY_X 466 467#define __S000 PAGE_NONE 468#define __S001 PAGE_READONLY_X 469#define __S010 PAGE_SHARED 470#define __S011 PAGE_SHARED_X 471#define __S100 PAGE_READONLY 472#define __S101 PAGE_READONLY_X 473#define __S110 PAGE_SHARED 474#define __S111 PAGE_SHARED_X 475 476#ifndef __ASSEMBLY__ 477/* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a 478 * kernel without large page PMD support */ 479extern unsigned long bad_call_to_PMD_PAGE_SIZE(void); 480 481/* 482 * Conversions between PTE values and page frame numbers. 483 */ 484 485/* in some case we want to additionaly adjust where the pfn is in the pte to 486 * allow room for more flags */ 487#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_PTE_64BIT) 488#define PFN_SHIFT_OFFSET (PAGE_SHIFT + 8) 489#else 490#define PFN_SHIFT_OFFSET (PAGE_SHIFT) 491#endif 492 493#define pte_pfn(x) (pte_val(x) >> PFN_SHIFT_OFFSET) 494#define pte_page(x) pfn_to_page(pte_pfn(x)) 495 496#define pfn_pte(pfn, prot) __pte(((pte_basic_t)(pfn) << PFN_SHIFT_OFFSET) |\ 497 pgprot_val(prot)) 498#define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot) 499 500/* 501 * ZERO_PAGE is a global shared page that is always zero: used 502 * for zero-mapped memory areas etc.. 503 */ 504extern unsigned long empty_zero_page[1024]; 505#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 506 507#endif /* __ASSEMBLY__ */ 508 509#define pte_none(pte) ((pte_val(pte) & ~_PTE_NONE_MASK) == 0) 510#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 511#define pte_clear(mm,addr,ptep) do { set_pte_at((mm), (addr), (ptep), __pte(0)); } while (0) 512 513#define pmd_none(pmd) (!pmd_val(pmd)) 514#define pmd_bad(pmd) (pmd_val(pmd) & _PMD_BAD) 515#define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK) 516#define pmd_clear(pmdp) do { pmd_val(*(pmdp)) = 0; } while (0) 517 518#ifndef __ASSEMBLY__ 519/* 520 * The "pgd_xxx()" functions here are trivial for a folded two-level 521 * setup: the pgd is never bad, and a pmd always exists (as it's folded 522 * into the pgd entry) 523 */ 524static inline int pgd_none(pgd_t pgd) { return 0; } 525static inline int pgd_bad(pgd_t pgd) { return 0; } 526static inline int pgd_present(pgd_t pgd) { return 1; } 527#define pgd_clear(xp) do { } while (0) 528 529#define pgd_page_vaddr(pgd) \ 530 ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK)) 531 532/* 533 * The following only work if pte_present() is true. 534 * Undefined behaviour if not.. 535 */ 536static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; } 537static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; } 538static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC; } 539static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } 540static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 541static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } 542 543static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; } 544static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; } 545 546static inline pte_t pte_rdprotect(pte_t pte) { 547 pte_val(pte) &= ~_PAGE_USER; return pte; } 548static inline pte_t pte_wrprotect(pte_t pte) { 549 pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); return pte; } 550static inline pte_t pte_exprotect(pte_t pte) { 551 pte_val(pte) &= ~_PAGE_EXEC; return pte; } 552static inline pte_t pte_mkclean(pte_t pte) { 553 pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HWWRITE); return pte; } 554static inline pte_t pte_mkold(pte_t pte) { 555 pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } 556 557static inline pte_t pte_mkread(pte_t pte) { 558 pte_val(pte) |= _PAGE_USER; return pte; } 559static inline pte_t pte_mkexec(pte_t pte) { 560 pte_val(pte) |= _PAGE_USER | _PAGE_EXEC; return pte; } 561static inline pte_t pte_mkwrite(pte_t pte) { 562 pte_val(pte) |= _PAGE_RW; return pte; } 563static inline pte_t pte_mkdirty(pte_t pte) { 564 pte_val(pte) |= _PAGE_DIRTY; return pte; } 565static inline pte_t pte_mkyoung(pte_t pte) { 566 pte_val(pte) |= _PAGE_ACCESSED; return pte; } 567 568static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 569{ 570 pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); 571 return pte; 572} 573 574/* 575 * When flushing the tlb entry for a page, we also need to flush the hash 576 * table entry. flush_hash_pages is assembler (for speed) in hashtable.S. 577 */ 578extern int flush_hash_pages(unsigned context, unsigned long va, 579 unsigned long pmdval, int count); 580 581/* Add an HPTE to the hash table */ 582extern void add_hash_page(unsigned context, unsigned long va, 583 unsigned long pmdval); 584 585/* 586 * Atomic PTE updates. 587 * 588 * pte_update clears and sets bit atomically, and returns 589 * the old pte value. In the 64-bit PTE case we lock around the 590 * low PTE word since we expect ALL flag bits to be there 591 */ 592#ifndef CONFIG_PTE_64BIT 593static inline unsigned long pte_update(pte_t *p, unsigned long clr, 594 unsigned long set) 595{ 596 unsigned long old, tmp; 597 598 __asm__ __volatile__("\ 5991: lwarx %0,0,%3\n\ 600 andc %1,%0,%4\n\ 601 or %1,%1,%5\n" 602 PPC405_ERR77(0,%3) 603" stwcx. %1,0,%3\n\ 604 bne- 1b" 605 : "=&r" (old), "=&r" (tmp), "=m" (*p) 606 : "r" (p), "r" (clr), "r" (set), "m" (*p) 607 : "cc" ); 608 return old; 609} 610#else 611static inline unsigned long long pte_update(pte_t *p, unsigned long clr, 612 unsigned long set) 613{ 614 unsigned long long old; 615 unsigned long tmp; 616 617 __asm__ __volatile__("\ 6181: lwarx %L0,0,%4\n\ 619 lwzx %0,0,%3\n\ 620 andc %1,%L0,%5\n\ 621 or %1,%1,%6\n" 622 PPC405_ERR77(0,%3) 623" stwcx. %1,0,%4\n\ 624 bne- 1b" 625 : "=&r" (old), "=&r" (tmp), "=m" (*p) 626 : "r" (p), "r" ((unsigned long)(p) + 4), "r" (clr), "r" (set), "m" (*p) 627 : "cc" ); 628 return old; 629} 630#endif 631 632/* 633 * set_pte stores a linux PTE into the linux page table. 634 * On machines which use an MMU hash table we avoid changing the 635 * _PAGE_HASHPTE bit. 636 */ 637static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 638 pte_t *ptep, pte_t pte) 639{ 640#if _PAGE_HASHPTE != 0 641 pte_update(ptep, ~_PAGE_HASHPTE, pte_val(pte) & ~_PAGE_HASHPTE); 642#else 643 *ptep = pte; 644#endif 645} 646 647/* 648 * 2.6 calles this without flushing the TLB entry, this is wrong 649 * for our hash-based implementation, we fix that up here 650 */ 651#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 652static inline int __ptep_test_and_clear_young(unsigned int context, unsigned long addr, pte_t *ptep) 653{ 654 unsigned long old; 655 old = pte_update(ptep, _PAGE_ACCESSED, 0); 656#if _PAGE_HASHPTE != 0 657 if (old & _PAGE_HASHPTE) { 658 unsigned long ptephys = __pa(ptep) & PAGE_MASK; 659 flush_hash_pages(context, addr, ptephys, 1); 660 } 661#endif 662 return (old & _PAGE_ACCESSED) != 0; 663} 664#define ptep_test_and_clear_young(__vma, __addr, __ptep) \ 665 __ptep_test_and_clear_young((__vma)->vm_mm->context.id, __addr, __ptep) 666 667#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY 668static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, 669 unsigned long addr, pte_t *ptep) 670{ 671 return (pte_update(ptep, (_PAGE_DIRTY | _PAGE_HWWRITE), 0) & _PAGE_DIRTY) != 0; 672} 673 674#define __HAVE_ARCH_PTEP_GET_AND_CLEAR 675static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, 676 pte_t *ptep) 677{ 678 return __pte(pte_update(ptep, ~_PAGE_HASHPTE, 0)); 679} 680 681#define __HAVE_ARCH_PTEP_SET_WRPROTECT 682static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, 683 pte_t *ptep) 684{ 685 pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), 0); 686} 687 688#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 689static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry, int dirty) 690{ 691 unsigned long bits = pte_val(entry) & 692 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW); 693 pte_update(ptep, 0, bits); 694} 695 696#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ 697({ \ 698 int __changed = !pte_same(*(__ptep), __entry); \ 699 if (__changed) { \ 700 __ptep_set_access_flags(__ptep, __entry, __dirty); \ 701 flush_tlb_page_nohash(__vma, __address); \ 702 } \ 703 __changed; \ 704}) 705 706/* 707 * Macro to mark a page protection value as "uncacheable". 708 */ 709#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_NO_CACHE | _PAGE_GUARDED)) 710 711struct file; 712extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 713 unsigned long size, pgprot_t vma_prot); 714#define __HAVE_PHYS_MEM_ACCESS_PROT 715 716#define __HAVE_ARCH_PTE_SAME 717#define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HASHPTE) == 0) 718 719/* 720 * Note that on Book E processors, the pmd contains the kernel virtual 721 * (lowmem) address of the pte page. The physical address is less useful 722 * because everything runs with translation enabled (even the TLB miss 723 * handler). On everything else the pmd contains the physical address 724 * of the pte page. -- paulus 725 */ 726#ifndef CONFIG_BOOKE 727#define pmd_page_vaddr(pmd) \ 728 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) 729#define pmd_page(pmd) \ 730 (mem_map + (pmd_val(pmd) >> PAGE_SHIFT)) 731#else 732#define pmd_page_vaddr(pmd) \ 733 ((unsigned long) (pmd_val(pmd) & PAGE_MASK)) 734#define pmd_page(pmd) \ 735 (mem_map + (__pa(pmd_val(pmd)) >> PAGE_SHIFT)) 736#endif 737 738/* to find an entry in a kernel page-table-directory */ 739#define pgd_offset_k(address) pgd_offset(&init_mm, address) 740 741/* to find an entry in a page-table-directory */ 742#define pgd_index(address) ((address) >> PGDIR_SHIFT) 743#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 744 745/* Find an entry in the second-level page table.. */ 746static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address) 747{ 748 return (pmd_t *) dir; 749} 750 751/* Find an entry in the third-level page table.. */ 752#define pte_index(address) \ 753 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 754#define pte_offset_kernel(dir, addr) \ 755 ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(addr)) 756#define pte_offset_map(dir, addr) \ 757 ((pte_t *) kmap_atomic(pmd_page(*(dir)), KM_PTE0) + pte_index(addr)) 758#define pte_offset_map_nested(dir, addr) \ 759 ((pte_t *) kmap_atomic(pmd_page(*(dir)), KM_PTE1) + pte_index(addr)) 760 761#define pte_unmap(pte) kunmap_atomic(pte, KM_PTE0) 762#define pte_unmap_nested(pte) kunmap_atomic(pte, KM_PTE1) 763 764extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 765 766extern void paging_init(void); 767 768/* 769 * Encode and decode a swap entry. 770 * Note that the bits we use in a PTE for representing a swap entry 771 * must not include the _PAGE_PRESENT bit, the _PAGE_FILE bit, or the 772 *_PAGE_HASHPTE bit (if used). -- paulus 773 */ 774#define __swp_type(entry) ((entry).val & 0x1f) 775#define __swp_offset(entry) ((entry).val >> 5) 776#define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 5) }) 777#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 }) 778#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 }) 779 780/* Encode and decode a nonlinear file mapping entry */ 781#define PTE_FILE_MAX_BITS 29 782#define pte_to_pgoff(pte) (pte_val(pte) >> 3) 783#define pgoff_to_pte(off) ((pte_t) { ((off) << 3) | _PAGE_FILE }) 784 785/* CONFIG_APUS */ 786/* For virtual address to physical address conversion */ 787extern void cache_clear(__u32 addr, int length); 788extern void cache_push(__u32 addr, int length); 789extern int mm_end_of_chunk (unsigned long addr, int len); 790extern unsigned long iopa(unsigned long addr); 791extern unsigned long mm_ptov(unsigned long addr) __attribute_const__; 792 793/* Values for nocacheflag and cmode */ 794/* These are not used by the APUS kernel_map, but prevents 795 compilation errors. */ 796#define KERNELMAP_FULL_CACHING 0 797#define KERNELMAP_NOCACHE_SER 1 798#define KERNELMAP_NOCACHE_NONSER 2 799#define KERNELMAP_NO_COPYBACK 3 800 801/* 802 * Map some physical address range into the kernel address space. 803 */ 804extern unsigned long kernel_map(unsigned long paddr, unsigned long size, 805 int nocacheflag, unsigned long *memavailp ); 806 807/* 808 * Set cache mode of (kernel space) address range. 809 */ 810extern void kernel_set_cachemode (unsigned long address, unsigned long size, 811 unsigned int cmode); 812 813/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 814#define kern_addr_valid(addr) (1) 815 816#ifdef CONFIG_PHYS_64BIT 817extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, 818 unsigned long paddr, unsigned long size, pgprot_t prot); 819 820static inline int io_remap_pfn_range(struct vm_area_struct *vma, 821 unsigned long vaddr, 822 unsigned long pfn, 823 unsigned long size, 824 pgprot_t prot) 825{ 826 phys_addr_t paddr64 = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 827 return remap_pfn_range(vma, vaddr, paddr64 >> PAGE_SHIFT, size, prot); 828} 829#else 830#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 831 remap_pfn_range(vma, vaddr, pfn, size, prot) 832#endif 833 834/* 835 * No page table caches to initialise 836 */ 837#define pgtable_cache_init() do { } while (0) 838 839extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, 840 pmd_t **pmdp); 841 842#include <asm-generic/pgtable.h> 843 844#endif /* !__ASSEMBLY__ */ 845 846#endif /* _PPC_PGTABLE_H */ 847#endif /* __KERNEL__ */ 848