LXR linux/include/asm-sparc/pgtable.h

   1/* $Id: pgtable.h,v 1.110 2001/12/21 04:56:17 davem Exp $ */
   2#ifndef _SPARC_PGTABLE_H
   3#define _SPARC_PGTABLE_H
   4
   5/*  asm-sparc/pgtable.h:  Defines and functions used to work
   6 *                        with Sparc page tables.
   7 *
   8 *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   9 *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  10 */
  11
  12#include <asm-generic/4level-fixup.h>
  13
  14#include <linux/spinlock.h>
  15#include <linux/swap.h>
  16#include <asm/types.h>
  17#ifdef CONFIG_SUN4
  18#include <asm/pgtsun4.h>
  19#else
  20#include <asm/pgtsun4c.h>
  21#endif
  22#include <asm/pgtsrmmu.h>
  23#include <asm/vac-ops.h>
  24#include <asm/oplib.h>
  25#include <asm/btfixup.h>
  26#include <asm/system.h>
  27
  28#ifndef __ASSEMBLY__
  29
  30struct vm_area_struct;
  31struct page;
  32
  33extern void load_mmu(void);
  34extern unsigned long calc_highpages(void);
  35
  36BTFIXUPDEF_SIMM13(pgdir_shift)
  37BTFIXUPDEF_SETHI(pgdir_size)
  38BTFIXUPDEF_SETHI(pgdir_mask)
  39
  40BTFIXUPDEF_SIMM13(ptrs_per_pmd)
  41BTFIXUPDEF_SIMM13(ptrs_per_pgd)
  42BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
  43
  44#define pte_ERROR(e)   __builtin_trap()
  45#define pmd_ERROR(e)   __builtin_trap()
  46#define pgd_ERROR(e)   __builtin_trap()
  47
  48BTFIXUPDEF_INT(page_none)
  49BTFIXUPDEF_INT(page_copy)
  50BTFIXUPDEF_INT(page_readonly)
  51BTFIXUPDEF_INT(page_kernel)
  52
  53#define PMD_SHIFT               SUN4C_PMD_SHIFT
  54#define PMD_SIZE                (1UL << PMD_SHIFT)
  55#define PMD_MASK                (~(PMD_SIZE-1))
  56#define PMD_ALIGN(__addr)       (((__addr) + ~PMD_MASK) & PMD_MASK)
  57#define PGDIR_SHIFT             BTFIXUP_SIMM13(pgdir_shift)
  58#define PGDIR_SIZE              BTFIXUP_SETHI(pgdir_size)
  59#define PGDIR_MASK              BTFIXUP_SETHI(pgdir_mask)
  60#define PTRS_PER_PTE            1024
  61#define PTRS_PER_PMD            BTFIXUP_SIMM13(ptrs_per_pmd)
  62#define PTRS_PER_PGD            BTFIXUP_SIMM13(ptrs_per_pgd)
  63#define USER_PTRS_PER_PGD       BTFIXUP_SIMM13(user_ptrs_per_pgd)
  64#define FIRST_USER_ADDRESS      0
  65#define PTE_SIZE                (PTRS_PER_PTE*4)
  66
  67#define PAGE_NONE      __pgprot(BTFIXUP_INT(page_none))
  68extern pgprot_t PAGE_SHARED;
  69#define PAGE_COPY      __pgprot(BTFIXUP_INT(page_copy))
  70#define PAGE_READONLY  __pgprot(BTFIXUP_INT(page_readonly))
  71
  72extern unsigned long page_kernel;
  73
  74#ifdef MODULE
  75#define PAGE_KERNEL     page_kernel
  76#else
  77#define PAGE_KERNEL    __pgprot(BTFIXUP_INT(page_kernel))
  78#endif
  79
  80/* Top-level page directory */
  81extern pgd_t swapper_pg_dir[1024];
  82
  83extern void paging_init(void);
  84
  85/* Page table for 0-4MB for everybody, on the Sparc this
  86 * holds the same as on the i386.
  87 */
  88extern pte_t pg0[1024];
  89extern pte_t pg1[1024];
  90extern pte_t pg2[1024];
  91extern pte_t pg3[1024];
  92
  93extern unsigned long ptr_in_current_pgd;
  94
  95/* Here is a trick, since mmap.c need the initializer elements for
  96 * protection_map[] to be constant at compile time, I set the following
  97 * to all zeros.  I set it to the real values after I link in the
  98 * appropriate MMU page table routines at boot time.
  99 */
 100#define __P000  __pgprot(0)
 101#define __P001  __pgprot(0)
 102#define __P010  __pgprot(0)
 103#define __P011  __pgprot(0)
 104#define __P100  __pgprot(0)
 105#define __P101  __pgprot(0)
 106#define __P110  __pgprot(0)
 107#define __P111  __pgprot(0)
 108
 109#define __S000  __pgprot(0)
 110#define __S001  __pgprot(0)
 111#define __S010  __pgprot(0)
 112#define __S011  __pgprot(0)
 113#define __S100  __pgprot(0)
 114#define __S101  __pgprot(0)
 115#define __S110  __pgprot(0)
 116#define __S111  __pgprot(0)
 117
 118extern int num_contexts;
 119
 120/* First physical page can be anywhere, the following is needed so that
 121 * va-->pa and vice versa conversions work properly without performance
 122 * hit for all __pa()/__va() operations.
 123 */
 124extern unsigned long phys_base;
 125extern unsigned long pfn_base;
 126
 127/*
 128 * BAD_PAGETABLE is used when we need a bogus page-table, while
 129 * BAD_PAGE is used for a bogus page.
 130 *
 131 * ZERO_PAGE is a global shared page that is always zero: used
 132 * for zero-mapped memory areas etc..
 133 */
 134extern pte_t * __bad_pagetable(void);
 135extern pte_t __bad_page(void);
 136extern unsigned long empty_zero_page;
 137
 138#define BAD_PAGETABLE __bad_pagetable()
 139#define BAD_PAGE __bad_page()
 140#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
 141
 142/*
 143 */
 144BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
 145BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
 146
 147#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
 148#define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
 149
 150BTFIXUPDEF_SETHI(none_mask)
 151BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
 152BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
 153
 154static inline int pte_none(pte_t pte)
 155{
 156        return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
 157}
 158
 159#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
 160#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
 161
 162BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
 163BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
 164BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
 165
 166static inline int pmd_none(pmd_t pmd)
 167{
 168        return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
 169}
 170
 171#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
 172#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
 173#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
 174
 175BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
 176BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
 177BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
 178BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
 179
 180#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
 181#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
 182#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
 183#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
 184
 185/*
 186 * The following only work if pte_present() is true.
 187 * Undefined behaviour if not..
 188 */
 189BTFIXUPDEF_HALF(pte_writei)
 190BTFIXUPDEF_HALF(pte_dirtyi)
 191BTFIXUPDEF_HALF(pte_youngi)
 192
 193static int pte_write(pte_t pte) __attribute_const__;
 194static inline int pte_write(pte_t pte)
 195{
 196        return pte_val(pte) & BTFIXUP_HALF(pte_writei);
 197}
 198
 199static int pte_dirty(pte_t pte) __attribute_const__;
 200static inline int pte_dirty(pte_t pte)
 201{
 202        return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
 203}
 204
 205static int pte_young(pte_t pte) __attribute_const__;
 206static inline int pte_young(pte_t pte)
 207{
 208        return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
 209}
 210
 211/*
 212 * The following only work if pte_present() is not true.
 213 */
 214BTFIXUPDEF_HALF(pte_filei)
 215
 216static int pte_file(pte_t pte) __attribute_const__;
 217static inline int pte_file(pte_t pte)
 218{
 219        return pte_val(pte) & BTFIXUP_HALF(pte_filei);
 220}
 221
 222/*
 223 */
 224BTFIXUPDEF_HALF(pte_wrprotecti)
 225BTFIXUPDEF_HALF(pte_mkcleani)
 226BTFIXUPDEF_HALF(pte_mkoldi)
 227
 228static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
 229static inline pte_t pte_wrprotect(pte_t pte)
 230{
 231        return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
 232}
 233
 234static pte_t pte_mkclean(pte_t pte) __attribute_const__;
 235static inline pte_t pte_mkclean(pte_t pte)
 236{
 237        return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
 238}
 239
 240static pte_t pte_mkold(pte_t pte) __attribute_const__;
 241static inline pte_t pte_mkold(pte_t pte)
 242{
 243        return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
 244}
 245
 246BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
 247BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
 248BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
 249
 250#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
 251#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
 252#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
 253
 254#define pfn_pte(pfn, prot)              mk_pte(pfn_to_page(pfn), prot)
 255
 256BTFIXUPDEF_CALL(unsigned long,   pte_pfn, pte_t)
 257#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
 258#define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 259
 260/*
 261 * Conversion functions: convert a page and protection to a page entry,
 262 * and a page entry and page directory to the page they refer to.
 263 */
 264BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
 265
 266BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
 267BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
 268BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
 269
 270#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
 271#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
 272#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
 273
 274#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
 275
 276BTFIXUPDEF_INT(pte_modify_mask)
 277
 278static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
 279static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 280{
 281        return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
 282                pgprot_val(newprot));
 283}
 284
 285#define pgd_index(address) ((address) >> PGDIR_SHIFT)
 286
 287/* to find an entry in a page-table-directory */
 288#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 289
 290/* to find an entry in a kernel page-table-directory */
 291#define pgd_offset_k(address) pgd_offset(&init_mm, address)
 292
 293/* Find an entry in the second-level page table.. */
 294BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
 295#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
 296
 297/* Find an entry in the third-level page table.. */ 
 298BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
 299#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
 300
 301/*
 302 * This shortcut works on sun4m (and sun4d) because the nocache area is static,
 303 * and sun4c is guaranteed to have no highmem anyway.
 304 */
 305#define pte_offset_map(d, a)            pte_offset_kernel(d,a)
 306#define pte_offset_map_nested(d, a)     pte_offset_kernel(d,a)
 307
 308#define pte_unmap(pte)          do{}while(0)
 309#define pte_unmap_nested(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,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
 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
 434extern int io_remap_pfn_range(struct vm_area_struct *vma,
 435                              unsigned long from, unsigned long pfn,
 436                              unsigned long size, pgprot_t prot);
 437
 438/*
 439 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 440 * its high 4 bits.  These macros/functions put it there or get it from there.
 441 */
 442#define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
 443#define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
 444#define GET_PFN(pfn)                    (pfn & 0x0fffffffUL)
 445
 446#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 447#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 448({                                                                        \
 449        int __changed = !pte_same(*(__ptep), __entry);                    \
 450        if (__changed) {                                                  \
 451                set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
 452                flush_tlb_page(__vma, __address);                         \
 453        }                                                                 \
 454        (sparc_cpu_model == sun4c) || __changed;                          \
 455})
 456
 457#include <asm-generic/pgtable.h>
 458
 459#endif /* !(__ASSEMBLY__) */
 460
 461/* We provide our own get_unmapped_area to cope with VA holes for userland */
 462#define HAVE_ARCH_UNMAPPED_AREA
 463
 464/*
 465 * No page table caches to initialise
 466 */
 467#define pgtable_cache_init()    do { } while (0)
 468
 469#endif /* !(_SPARC_PGTABLE_H) */
 470