LXR linux-bk/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/config.h>
  15#include <linux/spinlock.h>
  16#include <linux/swap.h>
  17#include <asm/types.h>
  18#ifdef CONFIG_SUN4
  19#include <asm/pgtsun4.h>
  20#else
  21#include <asm/pgtsun4c.h>
  22#endif
  23#include <asm/pgtsrmmu.h>
  24#include <asm/vac-ops.h>
  25#include <asm/oplib.h>
  26#include <asm/btfixup.h>
  27#include <asm/system.h>
  28
  29#ifndef __ASSEMBLY__
  30
  31struct vm_area_struct;
  32struct page;
  33
  34extern void load_mmu(void);
  35extern unsigned long calc_highpages(void);
  36
  37BTFIXUPDEF_SIMM13(pgdir_shift)
  38BTFIXUPDEF_SETHI(pgdir_size)
  39BTFIXUPDEF_SETHI(pgdir_mask)
  40
  41BTFIXUPDEF_SIMM13(ptrs_per_pmd)
  42BTFIXUPDEF_SIMM13(ptrs_per_pgd)
  43BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
  44
  45#define pte_ERROR(e)   __builtin_trap()
  46#define pmd_ERROR(e)   __builtin_trap()
  47#define pgd_ERROR(e)   __builtin_trap()
  48
  49BTFIXUPDEF_INT(page_none)
  50BTFIXUPDEF_INT(page_shared)
  51BTFIXUPDEF_INT(page_copy)
  52BTFIXUPDEF_INT(page_readonly)
  53BTFIXUPDEF_INT(page_kernel)
  54
  55#define PMD_SHIFT               SUN4C_PMD_SHIFT
  56#define PMD_SIZE                (1UL << PMD_SHIFT)
  57#define PMD_MASK                (~(PMD_SIZE-1))
  58#define PMD_ALIGN(__addr)       (((__addr) + ~PMD_MASK) & PMD_MASK)
  59#define PGDIR_SHIFT             BTFIXUP_SIMM13(pgdir_shift)
  60#define PGDIR_SIZE              BTFIXUP_SETHI(pgdir_size)
  61#define PGDIR_MASK              BTFIXUP_SETHI(pgdir_mask)
  62#define PTRS_PER_PTE            1024
  63#define PTRS_PER_PMD            BTFIXUP_SIMM13(ptrs_per_pmd)
  64#define PTRS_PER_PGD            BTFIXUP_SIMM13(ptrs_per_pgd)
  65#define USER_PTRS_PER_PGD       BTFIXUP_SIMM13(user_ptrs_per_pgd)
  66#define FIRST_USER_PGD_NR       0
  67#define PTE_SIZE                (PTRS_PER_PTE*4)
  68
  69#define PAGE_NONE      __pgprot(BTFIXUP_INT(page_none))
  70#define PAGE_SHARED    __pgprot(BTFIXUP_INT(page_shared))
  71#define PAGE_COPY      __pgprot(BTFIXUP_INT(page_copy))
  72#define PAGE_READONLY  __pgprot(BTFIXUP_INT(page_readonly))
  73
  74extern unsigned long page_kernel;
  75
  76#ifdef MODULE
  77#define PAGE_KERNEL     page_kernel
  78#else
  79#define PAGE_KERNEL    __pgprot(BTFIXUP_INT(page_kernel))
  80#endif
  81
  82/* Top-level page directory */
  83extern pgd_t swapper_pg_dir[1024];
  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, pgd_t)
 146
 147#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
 148#define pgd_page(pgd) BTFIXUP_CALL(pgd_page)(pgd)
 149
 150BTFIXUPDEF_SETHI(none_mask)
 151BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
 152BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
 153
 154extern __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(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
 166extern __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_readi)
 190BTFIXUPDEF_HALF(pte_writei)
 191BTFIXUPDEF_HALF(pte_dirtyi)
 192BTFIXUPDEF_HALF(pte_youngi)
 193
 194extern int pte_read(pte_t pte) __attribute_const__;
 195extern __inline__ int pte_read(pte_t pte)
 196{
 197        switch (sparc_cpu_model){
 198        case sun4:
 199        case sun4c:
 200                return pte_val(pte) & BTFIXUP_HALF(pte_readi);
 201        case sun4d:
 202        case sun4e:
 203        case sun4m:
 204                return !(pte_val(pte) & BTFIXUP_HALF(pte_readi));
 205        /* pacify gcc warnings */
 206        case sun4u:
 207        case sun_unknown:
 208        case ap1000:
 209        default:
 210                return 0;
 211        }
 212}
 213
 214extern int pte_write(pte_t pte) __attribute_const__;
 215extern __inline__ int pte_write(pte_t pte)
 216{
 217        return pte_val(pte) & BTFIXUP_HALF(pte_writei);
 218}
 219
 220extern int pte_dirty(pte_t pte) __attribute_const__;
 221extern __inline__ int pte_dirty(pte_t pte)
 222{
 223        return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
 224}
 225
 226extern int pte_young(pte_t pte) __attribute_const__;
 227extern __inline__ int pte_young(pte_t pte)
 228{
 229        return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
 230}
 231
 232/*
 233 * The following only work if pte_present() is not true.
 234 */
 235BTFIXUPDEF_HALF(pte_filei)
 236
 237extern int pte_file(pte_t pte) __attribute_const__;
 238extern __inline__ int pte_file(pte_t pte)
 239{
 240        return pte_val(pte) & BTFIXUP_HALF(pte_filei);
 241}
 242
 243/*
 244 */
 245BTFIXUPDEF_HALF(pte_wrprotecti)
 246BTFIXUPDEF_HALF(pte_mkcleani)
 247BTFIXUPDEF_HALF(pte_mkoldi)
 248
 249extern pte_t pte_wrprotect(pte_t pte) __attribute_const__;
 250extern __inline__ pte_t pte_wrprotect(pte_t pte)
 251{
 252        return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
 253}
 254
 255extern pte_t pte_mkclean(pte_t pte) __attribute_const__;
 256extern __inline__ pte_t pte_mkclean(pte_t pte)
 257{
 258        return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
 259}
 260
 261extern pte_t pte_mkold(pte_t pte) __attribute_const__;
 262extern __inline__ pte_t pte_mkold(pte_t pte)
 263{
 264        return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
 265}
 266
 267BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
 268BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
 269BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
 270
 271#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
 272#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
 273#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
 274
 275#define page_pte_prot(page, prot)       mk_pte(page, prot)
 276#define page_pte(page)                  mk_pte(page, __pgprot(0))
 277#define pfn_pte(pfn, prot)              mk_pte(pfn_to_page(pfn), prot)
 278
 279BTFIXUPDEF_CALL(unsigned long,   pte_pfn, pte_t)
 280#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
 281#define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 282
 283/*
 284 * Conversion functions: convert a page and protection to a page entry,
 285 * and a page entry and page directory to the page they refer to.
 286 */
 287BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
 288
 289BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
 290BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
 291
 292#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
 293#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
 294#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
 295
 296BTFIXUPDEF_INT(pte_modify_mask)
 297
 298extern pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
 299extern __inline__ pte_t pte_modify(pte_t pte, pgprot_t newprot)
 300{
 301        return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
 302                pgprot_val(newprot));
 303}
 304
 305#define pgd_index(address) ((address) >> PGDIR_SHIFT)
 306
 307/* to find an entry in a page-table-directory */
 308#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 309
 310/* to find an entry in a kernel page-table-directory */
 311#define pgd_offset_k(address) pgd_offset(&init_mm, address)
 312
 313/* Find an entry in the second-level page table.. */
 314BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
 315#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
 316
 317/* Find an entry in the third-level page table.. */ 
 318BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
 319#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
 320
 321/*
 322 * This shortcut works on sun4m (and sun4d) because the nocache area is static,
 323 * and sun4c is guaranteed to have no highmem anyway.
 324 */
 325#define pte_offset_map(d, a)            pte_offset_kernel(d,a)
 326#define pte_offset_map_nested(d, a)     pte_offset_kernel(d,a)
 327
 328#define pte_unmap(pte)          do{}while(0)
 329#define pte_unmap_nested(pte)   do{}while(0)
 330
 331/* The permissions for pgprot_val to make a page mapped on the obio space */
 332extern unsigned int pg_iobits;
 333
 334/* Certain architectures need to do special things when pte's
 335 * within a page table are directly modified.  Thus, the following
 336 * hook is made available.
 337 */
 338
 339BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
 340
 341#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
 342
 343struct seq_file;
 344BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
 345
 346#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
 347
 348/* Fault handler stuff... */
 349#define FAULT_CODE_PROT     0x1
 350#define FAULT_CODE_WRITE    0x2
 351#define FAULT_CODE_USER     0x4
 352
 353BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
 354
 355#define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
 356
 357BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
 358    unsigned long, unsigned int)
 359BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
 360#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
 361#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
 362
 363extern int invalid_segment;
 364
 365/* Encode and de-code a swap entry */
 366BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
 367BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
 368BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
 369
 370#define __swp_type(__x)                 BTFIXUP_CALL(__swp_type)(__x)
 371#define __swp_offset(__x)               BTFIXUP_CALL(__swp_offset)(__x)
 372#define __swp_entry(__type,__off)       BTFIXUP_CALL(__swp_entry)(__type,__off)
 373
 374#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 375#define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 376
 377/* file-offset-in-pte helpers */
 378BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
 379BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
 380
 381#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
 382#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
 383
 384/*
 385 * This is made a constant because mm/fremap.c required a constant.
 386 * Note that layout of these bits is different between sun4c.c and srmmu.c.
 387 */
 388#define PTE_FILE_MAX_BITS 24
 389
 390/*
 391 */
 392struct ctx_list {
 393        struct ctx_list *next;
 394        struct ctx_list *prev;
 395        unsigned int ctx_number;
 396        struct mm_struct *ctx_mm;
 397};
 398
 399extern struct ctx_list *ctx_list_pool;  /* Dynamically allocated */
 400extern struct ctx_list ctx_free;        /* Head of free list */
 401extern struct ctx_list ctx_used;        /* Head of used contexts list */
 402
 403#define NO_CONTEXT     -1
 404
 405extern __inline__ void remove_from_ctx_list(struct ctx_list *entry)
 406{
 407        entry->next->prev = entry->prev;
 408        entry->prev->next = entry->next;
 409}
 410
 411extern __inline__ void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
 412{
 413        entry->next = head;
 414        (entry->prev = head->prev)->next = entry;
 415        head->prev = entry;
 416}
 417#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
 418#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
 419
 420extern __inline__ unsigned long
 421__get_phys (unsigned long addr)
 422{
 423        switch (sparc_cpu_model){
 424        case sun4:
 425        case sun4c:
 426                return sun4c_get_pte (addr) << PAGE_SHIFT;
 427        case sun4m:
 428        case sun4d:
 429                return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
 430        default:
 431                return 0;
 432        }
 433}
 434
 435extern __inline__ int
 436__get_iospace (unsigned long addr)
 437{
 438        switch (sparc_cpu_model){
 439        case sun4:
 440        case sun4c:
 441                return -1; /* Don't check iospace on sun4c */
 442        case sun4m:
 443        case sun4d:
 444                return (srmmu_get_pte (addr) >> 28);
 445        default:
 446                return -1;
 447        }
 448}
 449
 450extern unsigned long *sparc_valid_addr_bitmap;
 451
 452/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 453#define kern_addr_valid(addr) \
 454        (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
 455
 456extern int io_remap_page_range(struct vm_area_struct *vma, unsigned long from, unsigned long to,
 457                               unsigned long size, pgprot_t prot, int space);
 458
 459#include <asm-generic/pgtable.h>
 460
 461#endif /* !(__ASSEMBLY__) */
 462
 463/* We provide our own get_unmapped_area to cope with VA holes for userland */
 464#define HAVE_ARCH_UNMAPPED_AREA
 465
 466/*
 467 * No page table caches to initialise
 468 */
 469#define pgtable_cache_init()    do { } while (0)
 470
 471#endif /* !(_SPARC_PGTABLE_H) */
 472