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