LXR linux/arch/sparc/include/asm/pgtable

   1#ifndef _SPARC_PGTABLE_H
   2#define _SPARC_PGTABLE_H
   3
   4/*  asm/pgtable.h:  Defines and functions used to work
   5 *                        with Sparc page tables.
   6 *
   7 *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   8 *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   9 */
  10
  11#include <linux/const.h>
  12
  13#ifndef __ASSEMBLY__
  14#include <asm-generic/4level-fixup.h>
  15
  16#include <linux/spinlock.h>
  17#include <linux/swap.h>
  18#include <asm/types.h>
  19#include <asm/pgtsun4c.h>
  20#include <asm/pgtsrmmu.h>
  21#include <asm/vac-ops.h>
  22#include <asm/oplib.h>
  23#include <asm/btfixup.h>
  24#include <asm/system.h>
  25
  26
  27struct vm_area_struct;
  28struct page;
  29
  30extern void load_mmu(void);
  31extern unsigned long calc_highpages(void);
  32
  33BTFIXUPDEF_SIMM13(pgdir_shift)
  34BTFIXUPDEF_SETHI(pgdir_size)
  35BTFIXUPDEF_SETHI(pgdir_mask)
  36
  37BTFIXUPDEF_SIMM13(ptrs_per_pmd)
  38BTFIXUPDEF_SIMM13(ptrs_per_pgd)
  39BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
  40
  41#define pte_ERROR(e)   __builtin_trap()
  42#define pmd_ERROR(e)   __builtin_trap()
  43#define pgd_ERROR(e)   __builtin_trap()
  44
  45BTFIXUPDEF_INT(page_none)
  46BTFIXUPDEF_INT(page_copy)
  47BTFIXUPDEF_INT(page_readonly)
  48BTFIXUPDEF_INT(page_kernel)
  49
  50#define PMD_SHIFT               SUN4C_PMD_SHIFT
  51#define PMD_SIZE                (1UL << PMD_SHIFT)
  52#define PMD_MASK                (~(PMD_SIZE-1))
  53#define PMD_ALIGN(__addr)       (((__addr) + ~PMD_MASK) & PMD_MASK)
  54#define PGDIR_SHIFT             BTFIXUP_SIMM13(pgdir_shift)
  55#define PGDIR_SIZE              BTFIXUP_SETHI(pgdir_size)
  56#define PGDIR_MASK              BTFIXUP_SETHI(pgdir_mask)
  57#define PTRS_PER_PTE            1024
  58#define PTRS_PER_PMD            BTFIXUP_SIMM13(ptrs_per_pmd)
  59#define PTRS_PER_PGD            BTFIXUP_SIMM13(ptrs_per_pgd)
  60#define USER_PTRS_PER_PGD       BTFIXUP_SIMM13(user_ptrs_per_pgd)
  61#define FIRST_USER_ADDRESS      0
  62#define PTE_SIZE                (PTRS_PER_PTE*4)
  63
  64#define PAGE_NONE      __pgprot(BTFIXUP_INT(page_none))
  65extern pgprot_t PAGE_SHARED;
  66#define PAGE_COPY      __pgprot(BTFIXUP_INT(page_copy))
  67#define PAGE_READONLY  __pgprot(BTFIXUP_INT(page_readonly))
  68
  69extern unsigned long page_kernel;
  70
  71#ifdef MODULE
  72#define PAGE_KERNEL     page_kernel
  73#else
  74#define PAGE_KERNEL    __pgprot(BTFIXUP_INT(page_kernel))
  75#endif
  76
  77/* Top-level page directory */
  78extern pgd_t swapper_pg_dir[1024];
  79
  80extern void paging_init(void);
  81
  82/* Page table for 0-4MB for everybody, on the Sparc this
  83 * holds the same as on the i386.
  84 */
  85extern pte_t pg0[1024];
  86extern pte_t pg1[1024];
  87extern pte_t pg2[1024];
  88extern pte_t pg3[1024];
  89
  90extern unsigned long ptr_in_current_pgd;
  91
  92/* Here is a trick, since mmap.c need the initializer elements for
  93 * protection_map[] to be constant at compile time, I set the following
  94 * to all zeros.  I set it to the real values after I link in the
  95 * appropriate MMU page table routines at boot time.
  96 */
  97#define __P000  __pgprot(0)
  98#define __P001  __pgprot(0)
  99#define __P010  __pgprot(0)
 100#define __P011  __pgprot(0)
 101#define __P100  __pgprot(0)
 102#define __P101  __pgprot(0)
 103#define __P110  __pgprot(0)
 104#define __P111  __pgprot(0)
 105
 106#define __S000  __pgprot(0)
 107#define __S001  __pgprot(0)
 108#define __S010  __pgprot(0)
 109#define __S011  __pgprot(0)
 110#define __S100  __pgprot(0)
 111#define __S101  __pgprot(0)
 112#define __S110  __pgprot(0)
 113#define __S111  __pgprot(0)
 114
 115extern int num_contexts;
 116
 117/* First physical page can be anywhere, the following is needed so that
 118 * va-->pa and vice versa conversions work properly without performance
 119 * hit for all __pa()/__va() operations.
 120 */
 121extern unsigned long phys_base;
 122extern unsigned long pfn_base;
 123
 124/*
 125 * BAD_PAGETABLE is used when we need a bogus page-table, while
 126 * BAD_PAGE is used for a bogus page.
 127 *
 128 * ZERO_PAGE is a global shared page that is always zero: used
 129 * for zero-mapped memory areas etc..
 130 */
 131extern pte_t * __bad_pagetable(void);
 132extern pte_t __bad_page(void);
 133extern unsigned long empty_zero_page;
 134
 135#define BAD_PAGETABLE __bad_pagetable()
 136#define BAD_PAGE __bad_page()
 137#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
 138
 139/*
 140 */
 141BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
 142BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
 143
 144#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
 145#define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
 146
 147BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
 148BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
 149
 150static inline int pte_none(pte_t pte)
 151{
 152        return !pte_val(pte);
 153}
 154
 155#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
 156#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
 157
 158BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
 159BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
 160BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
 161
 162static inline int pmd_none(pmd_t pmd)
 163{
 164        return !pmd_val(pmd);
 165}
 166
 167#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
 168#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
 169#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
 170
 171BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
 172BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
 173BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
 174BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
 175
 176#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
 177#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
 178#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
 179#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
 180
 181/*
 182 * The following only work if pte_present() is true.
 183 * Undefined behaviour if not..
 184 */
 185BTFIXUPDEF_HALF(pte_writei)
 186BTFIXUPDEF_HALF(pte_dirtyi)
 187BTFIXUPDEF_HALF(pte_youngi)
 188
 189static int pte_write(pte_t pte) __attribute_const__;
 190static inline int pte_write(pte_t pte)
 191{
 192        return pte_val(pte) & BTFIXUP_HALF(pte_writei);
 193}
 194
 195static int pte_dirty(pte_t pte) __attribute_const__;
 196static inline int pte_dirty(pte_t pte)
 197{
 198        return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
 199}
 200
 201static int pte_young(pte_t pte) __attribute_const__;
 202static inline int pte_young(pte_t pte)
 203{
 204        return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
 205}
 206
 207/*
 208 * The following only work if pte_present() is not true.
 209 */
 210BTFIXUPDEF_HALF(pte_filei)
 211
 212static int pte_file(pte_t pte) __attribute_const__;
 213static inline int pte_file(pte_t pte)
 214{
 215        return pte_val(pte) & BTFIXUP_HALF(pte_filei);
 216}
 217
 218static inline int pte_special(pte_t pte)
 219{
 220        return 0;
 221}
 222
 223/*
 224 */
 225BTFIXUPDEF_HALF(pte_wrprotecti)
 226BTFIXUPDEF_HALF(pte_mkcleani)
 227BTFIXUPDEF_HALF(pte_mkoldi)
 228
 229static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
 230static inline pte_t pte_wrprotect(pte_t pte)
 231{
 232        return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
 233}
 234
 235static pte_t pte_mkclean(pte_t pte) __attribute_const__;
 236static inline pte_t pte_mkclean(pte_t pte)
 237{
 238        return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
 239}
 240
 241static pte_t pte_mkold(pte_t pte) __attribute_const__;
 242static inline pte_t pte_mkold(pte_t pte)
 243{
 244        return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
 245}
 246
 247BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
 248BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
 249BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
 250
 251#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
 252#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
 253#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
 254
 255#define pte_mkspecial(pte)    (pte)
 256
 257#define pfn_pte(pfn, prot)              mk_pte(pfn_to_page(pfn), prot)
 258
 259BTFIXUPDEF_CALL(unsigned long,   pte_pfn, pte_t)
 260#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
 261#define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 262
 263/*
 264 * Conversion functions: convert a page and protection to a page entry,
 265 * and a page entry and page directory to the page they refer to.
 266 */
 267BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
 268
 269BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
 270BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
 271BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
 272
 273#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
 274#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
 275#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
 276
 277#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
 278
 279BTFIXUPDEF_INT(pte_modify_mask)
 280
 281static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
 282static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 283{
 284        return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
 285                pgprot_val(newprot));
 286}
 287
 288#define pgd_index(address) ((address) >> PGDIR_SHIFT)
 289
 290/* to find an entry in a page-table-directory */
 291#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 292
 293/* to find an entry in a kernel page-table-directory */
 294#define pgd_offset_k(address) pgd_offset(&init_mm, address)
 295
 296/* Find an entry in the second-level page table.. */
 297BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
 298#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
 299
 300/* Find an entry in the third-level page table.. */
 301BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
 302#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
 303
 304/*
 305 * This shortcut works on sun4m (and sun4d) because the nocache area is static,
 306 * and sun4c is guaranteed to have no highmem anyway.
 307 */
 308#define pte_offset_map(d, a)            pte_offset_kernel(d,a)
 309#define pte_unmap(pte)          do{}while(0)
 310
 311/* Certain architectures need to do special things when pte's
 312 * within a page table are directly modified.  Thus, the following
 313 * hook is made available.
 314 */
 315
 316BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
 317
 318#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
 319#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 320
 321struct seq_file;
 322BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
 323
 324#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
 325
 326/* Fault handler stuff... */
 327#define FAULT_CODE_PROT     0x1
 328#define FAULT_CODE_WRITE    0x2
 329#define FAULT_CODE_USER     0x4
 330
 331BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t *)
 332
 333#define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)
 334
 335BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
 336    unsigned long, unsigned int)
 337BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
 338#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
 339#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
 340
 341extern int invalid_segment;
 342
 343/* Encode and de-code a swap entry */
 344BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
 345BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
 346BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
 347
 348#define __swp_type(__x)                 BTFIXUP_CALL(__swp_type)(__x)
 349#define __swp_offset(__x)               BTFIXUP_CALL(__swp_offset)(__x)
 350#define __swp_entry(__type,__off)       BTFIXUP_CALL(__swp_entry)(__type,__off)
 351
 352#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 353#define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 354
 355/* file-offset-in-pte helpers */
 356BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
 357BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
 358
 359#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
 360#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
 361
 362/*
 363 * This is made a constant because mm/fremap.c required a constant.
 364 * Note that layout of these bits is different between sun4c.c and srmmu.c.
 365 */
 366#define PTE_FILE_MAX_BITS 24
 367
 368/*
 369 */
 370struct ctx_list {
 371        struct ctx_list *next;
 372        struct ctx_list *prev;
 373        unsigned int ctx_number;
 374        struct mm_struct *ctx_mm;
 375};
 376
 377extern struct ctx_list *ctx_list_pool;  /* Dynamically allocated */
 378extern struct ctx_list ctx_free;        /* Head of free list */
 379extern struct ctx_list ctx_used;        /* Head of used contexts list */
 380
 381#define NO_CONTEXT     -1
 382
 383static inline void remove_from_ctx_list(struct ctx_list *entry)
 384{
 385        entry->next->prev = entry->prev;
 386        entry->prev->next = entry->next;
 387}
 388
 389static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
 390{
 391        entry->next = head;
 392        (entry->prev = head->prev)->next = entry;
 393        head->prev = entry;
 394}
 395#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
 396#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
 397
 398static inline unsigned long
 399__get_phys (unsigned long addr)
 400{
 401        switch (sparc_cpu_model){
 402        case sun4:
 403        case sun4c:
 404                return sun4c_get_pte (addr) << PAGE_SHIFT;
 405        case sun4m:
 406        case sun4d:
 407                return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
 408        default:
 409                return 0;
 410        }
 411}
 412
 413static inline int
 414__get_iospace (unsigned long addr)
 415{
 416        switch (sparc_cpu_model){
 417        case sun4:
 418        case sun4c:
 419                return -1; /* Don't check iospace on sun4c */
 420        case sun4m:
 421        case sun4d:
 422                return (srmmu_get_pte (addr) >> 28);
 423        default:
 424                return -1;
 425        }
 426}
 427
 428extern unsigned long *sparc_valid_addr_bitmap;
 429
 430/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 431#define kern_addr_valid(addr) \
 432        (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
 433
 434/*
 435 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 436 * its high 4 bits.  These macros/functions put it there or get it from there.
 437 */
 438#define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
 439#define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
 440#define GET_PFN(pfn)                    (pfn & 0x0fffffffUL)
 441
 442extern int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
 443                           unsigned long, pgprot_t);
 444
 445static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 446                                     unsigned long from, unsigned long pfn,
 447                                     unsigned long size, pgprot_t prot)
 448{
 449        unsigned long long offset, space, phys_base;
 450
 451        offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
 452        space = GET_IOSPACE(pfn);
 453        phys_base = offset | (space << 32ULL);
 454
 455        return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
 456}
 457
 458#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 459#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 460({                                                                        \
 461        int __changed = !pte_same(*(__ptep), __entry);                    \
 462        if (__changed) {                                                  \
 463                set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
 464                flush_tlb_page(__vma, __address);                         \
 465        }                                                                 \
 466        (sparc_cpu_model == sun4c) || __changed;                          \
 467})
 468
 469#include <asm-generic/pgtable.h>
 470
 471#endif /* !(__ASSEMBLY__) */
 472
 473#define VMALLOC_START           _AC(0xfe600000,UL)
 474/* XXX Alter this when I get around to fixing sun4c - Anton */
 475#define VMALLOC_END             _AC(0xffc00000,UL)
 476
 477
 478/* We provide our own get_unmapped_area to cope with VA holes for userland */
 479#define HAVE_ARCH_UNMAPPED_AREA
 480
 481/*
 482 * No page table caches to initialise
 483 */
 484#define pgtable_cache_init()    do { } while (0)
 485
 486#endif /* !(_SPARC_PGTABLE_H) */
 487