root/include/asm-sparc/pgtable.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. remove_from_ctx_list
  2. add_to_ctx_list

   1 /* $Id: pgtable.h,v 1.35 1996/02/21 17:57:30 miguel 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  */
  10 
  11 #include <linux/mm.h>
  12 #include <asm/asi.h>
  13 #include <asm/pgtsun4c.h>
  14 #include <asm/pgtsrmmu.h>
  15 #include <asm/vac-ops.h>
  16 #include <asm/oplib.h>
  17 #include <asm/sbus.h>
  18 
  19 extern void load_mmu(void);
  20 
  21 extern void (*quick_kernel_fault)(unsigned long);
  22 
  23 /* mmu-specific process creation/cloning/etc hooks. */
  24 extern void (*mmu_exit_hook)(void);
  25 extern void (*mmu_flush_hook)(void);
  26 
  27 /* Routines for data transfer buffers. */
  28 extern char *(*mmu_lockarea)(char *, unsigned long);
  29 extern void  (*mmu_unlockarea)(char *, unsigned long);
  30 
  31 /* Routines for getting a dvma scsi buffer. */
  32 extern char *(*mmu_get_scsi_buffer)(char *, unsigned long, struct linux_sbus *sbus);
  33 extern void  (*mmu_release_scsi_buffer)(char *, unsigned long, struct linux_sbus *sbus);
  34 
  35 extern unsigned int pmd_shift;
  36 extern unsigned int pmd_size;
  37 extern unsigned int pmd_mask;
  38 extern unsigned int (*pmd_align)(unsigned int);
  39 
  40 extern unsigned int pgdir_shift;
  41 extern unsigned int pgdir_size;
  42 extern unsigned int pgdir_mask;
  43 extern unsigned int (*pgdir_align)(unsigned int);
  44 
  45 extern unsigned int ptrs_per_pte;
  46 extern unsigned int ptrs_per_pmd;
  47 extern unsigned int ptrs_per_pgd;
  48 
  49 extern unsigned int ptrs_per_page;
  50 
  51 extern unsigned long (*(vmalloc_start))(void);
  52 
  53 #define VMALLOC_VMADDR(x) ((unsigned long)(x))
  54 #define VMALLOC_START vmalloc_start()
  55 
  56 extern pgprot_t page_none;
  57 extern pgprot_t page_shared;
  58 extern pgprot_t page_copy;
  59 extern pgprot_t page_readonly;
  60 extern pgprot_t page_kernel;
  61 
  62 #define PMD_SHIFT      (pmd_shift)
  63 #define PMD_SIZE       (pmd_size)
  64 #define PMD_MASK       (pmd_mask)
  65 #define PMD_ALIGN      (pmd_align)
  66 #define PGDIR_SHIFT    (pgdir_shift)
  67 #define PGDIR_SIZE     (pgdir_size)
  68 #define PGDIR_MASK     (pgdir_mask)
  69 #define PGDIR_ALIGN    (pgdir_align)
  70 #define PTRS_PER_PTE   (ptrs_per_pte)
  71 #define PTRS_PER_PMD   (ptrs_per_pmd)
  72 #define PTRS_PER_PGD   (ptrs_per_pgd)
  73 
  74 #define PAGE_NONE      (page_none)
  75 #define PAGE_SHARED    (page_shared)
  76 #define PAGE_COPY      (page_copy)
  77 #define PAGE_READONLY  (page_readonly)
  78 #define PAGE_KERNEL    (page_kernel)
  79 #define PAGE_INVALID   (page_invalid)
  80 
  81 /* Top-level page directory */
  82 extern pgd_t swapper_pg_dir[1024];
  83 
  84 /* Page table for 0-4MB for everybody, on the Sparc this
  85  * holds the same as on the i386.
  86  */
  87 extern pte_t pg0[1024];
  88 
  89 extern unsigned long ptr_in_current_pgd;
  90 
  91 /* the no. of pointers that fit on a page: this will go away */
  92 #define PTRS_PER_PAGE   (PAGE_SIZE/sizeof(void*))
  93 
  94 /* Here is a trick, since mmap.c need the initializer elements for
  95  * protection_map[] to be constant at compile time, I set the following
  96  * to all zeros.  I set it to the real values after I link in the
  97  * appropriate MMU page table routines at boot time.
  98  */
  99 #define __P000  __pgprot(0)
 100 #define __P001  __pgprot(0)
 101 #define __P010  __pgprot(0)
 102 #define __P011  __pgprot(0)
 103 #define __P100  __pgprot(0)
 104 #define __P101  __pgprot(0)
 105 #define __P110  __pgprot(0)
 106 #define __P111  __pgprot(0)
 107 
 108 #define __S000  __pgprot(0)
 109 #define __S001  __pgprot(0)
 110 #define __S010  __pgprot(0)
 111 #define __S011  __pgprot(0)
 112 #define __S100  __pgprot(0)
 113 #define __S101  __pgprot(0)
 114 #define __S110  __pgprot(0)
 115 #define __S111  __pgprot(0)
 116 
 117 extern int num_contexts;
 118 
 119 /*
 120  * BAD_PAGETABLE is used when we need a bogus page-table, while
 121  * BAD_PAGE is used for a bogus page.
 122  *
 123  * ZERO_PAGE is a global shared page that is always zero: used
 124  * for zero-mapped memory areas etc..
 125  */
 126 extern pte_t __bad_page(void);
 127 extern pte_t * __bad_pagetable(void);
 128 
 129 extern unsigned long empty_zero_page;
 130 
 131 #define BAD_PAGETABLE __bad_pagetable()
 132 #define BAD_PAGE __bad_page()
 133 #define ZERO_PAGE (&empty_zero_page)
 134 
 135 /* number of bits that fit into a memory pointer */
 136 #define BITS_PER_PTR      (8*sizeof(unsigned long))
 137 
 138 /* to align the pointer to a pointer address */
 139 #define PTR_MASK          (~(sizeof(void*)-1))
 140 
 141 #define SIZEOF_PTR_LOG2   2
 142 
 143 extern unsigned long (*pte_page)(pte_t);
 144 extern unsigned long (*pmd_page)(pmd_t);
 145 extern unsigned long (*pgd_page)(pgd_t);
 146 
 147 extern void (*sparc_update_rootmmu_dir)(struct task_struct *, pgd_t *pgdir);
 148 
 149 #define SET_PAGE_DIR(tsk,pgdir) sparc_update_rootmmu_dir(tsk, pgdir)
 150        
 151 /* to find an entry in a page-table */
 152 #define PAGE_PTR(address) \
 153 ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
 154 
 155 extern unsigned long high_memory;
 156 
 157 extern int (*pte_none)(pte_t);
 158 extern int (*pte_present)(pte_t);
 159 extern int (*pte_inuse)(pte_t *);
 160 extern void (*pte_clear)(pte_t *);
 161 extern void (*pte_reuse)(pte_t *);
 162 
 163 extern int (*pmd_none)(pmd_t);
 164 extern int (*pmd_bad)(pmd_t);
 165 extern int (*pmd_present)(pmd_t);
 166 extern int (*pmd_inuse)(pmd_t *);
 167 extern void (*pmd_clear)(pmd_t *);
 168 extern void (*pmd_reuse)(pmd_t *);
 169 
 170 extern int (*pgd_none)(pgd_t);
 171 extern int (*pgd_bad)(pgd_t);
 172 extern int (*pgd_present)(pgd_t);
 173 extern int (*pgd_inuse)(pgd_t *);
 174 extern void (*pgd_clear)(pgd_t *);
 175 extern void (*pgd_reuse)(pgd_t *);
 176 
 177 /*
 178  * The following only work if pte_present() is true.
 179  * Undefined behaviour if not..
 180  */
 181 extern int (*pte_write)(pte_t);
 182 extern int (*pte_dirty)(pte_t);
 183 extern int (*pte_young)(pte_t);
 184 
 185 extern pte_t (*pte_wrprotect)(pte_t);
 186 extern pte_t (*pte_mkclean)(pte_t);
 187 extern pte_t (*pte_mkold)(pte_t);
 188 extern pte_t (*pte_mkwrite)(pte_t);
 189 extern pte_t (*pte_mkdirty)(pte_t);
 190 extern pte_t (*pte_mkyoung)(pte_t);
 191 
 192 /*
 193  * Conversion functions: convert a page and protection to a page entry,
 194  * and a page entry and page directory to the page they refer to.
 195  */
 196 extern pte_t (*mk_pte)(unsigned long, pgprot_t);
 197 extern pte_t (*mk_pte_io)(unsigned long, pgprot_t);
 198 
 199 extern void (*pgd_set)(pgd_t *, pmd_t *);
 200 
 201 extern pte_t (*pte_modify)(pte_t, pgprot_t);
 202 
 203 /* to find an entry in a page-table-directory */
 204 extern pgd_t * (*pgd_offset)(struct mm_struct *, unsigned long);
 205 
 206 /* Find an entry in the second-level page table.. */
 207 extern pmd_t * (*pmd_offset)(pgd_t *, unsigned long);
 208 
 209 /* Find an entry in the third-level page table.. */ 
 210 extern pte_t * (*pte_offset)(pmd_t *, unsigned long);
 211 
 212 /*
 213  * Allocate and free page tables. The xxx_kernel() versions are
 214  * used to allocate a kernel page table - this turns on ASN bits
 215  * if any, and marks the page tables reserved.
 216  */
 217 extern void (*pte_free_kernel)(pte_t *);
 218 
 219 extern pte_t * (*pte_alloc_kernel)(pmd_t *, unsigned long);
 220 
 221 /*
 222  * allocating and freeing a pmd is trivial: the 1-entry pmd is
 223  * inside the pgd, so has no extra memory associated with it.
 224  */
 225 extern void (*pmd_free_kernel)(pmd_t *);
 226 
 227 extern pmd_t * (*pmd_alloc_kernel)(pgd_t *, unsigned long);
 228 
 229 extern void (*pte_free)(pte_t *);
 230 
 231 extern pte_t * (*pte_alloc)(pmd_t *, unsigned long);
 232 
 233 /*
 234  * allocating and freeing a pmd is trivial: the 1-entry pmd is
 235  * inside the pgd, so has no extra memory associated with it.
 236  */
 237 extern void (*pmd_free)(pmd_t *);
 238 
 239 extern pmd_t * (*pmd_alloc)(pgd_t *, unsigned long);
 240 
 241 extern void (*pgd_free)(pgd_t *);
 242 
 243 extern pgd_t * (*pgd_alloc)(void);
 244 
 245 /* Fine grained invalidation. */
 246 extern void (*invalidate_all)(void);
 247 extern void (*invalidate_mm)(struct mm_struct *);
 248 extern void (*invalidate_range)(struct mm_struct *, unsigned long start, unsigned long end);
 249 extern void (*invalidate_page)(struct vm_area_struct *, unsigned long address);
 250 
 251 /* The permissions for pgprot_val to make a page mapped on the obio space */
 252 extern unsigned int pg_iobits;
 253 
 254 /* MMU context switching. */
 255 extern void (*switch_to_context)(struct task_struct *tsk);
 256 
 257 /* Certain architectures need to do special things when pte's
 258  * within a page table are directly modified.  Thus, the following
 259  * hook is made available.
 260  */
 261 extern void (*set_pte)(pte_t *pteptr, pte_t pteval);
 262 
 263 extern char *(*mmu_info)(void);
 264 
 265 /* Fault handler stuff... */
 266 #define FAULT_CODE_PROT     0x1
 267 #define FAULT_CODE_WRITE    0x2
 268 #define FAULT_CODE_USER     0x4
 269 extern void (*update_mmu_cache)(struct vm_area_struct *vma, unsigned long address, pte_t pte);
 270 
 271 extern int invalid_segment;
 272 
 273 #define SWP_TYPE(entry) (((entry)>>2) & 0x7f)
 274 #define SWP_OFFSET(entry) ((entry) >> 9)
 275 #define SWP_ENTRY(type,offset) (((type) << 2) | ((offset) << 9))
 276 
 277 struct ctx_list {
 278         struct ctx_list *next;
 279         struct ctx_list *prev;
 280         unsigned char ctx_number;
 281         struct mm_struct *ctx_mm;
 282 };
 283 
 284 extern struct ctx_list *ctx_list_pool;  /* Dynamically allocated */
 285 extern struct ctx_list ctx_free;        /* Head of free list */
 286 extern struct ctx_list ctx_used;        /* Head of used contexts list */
 287 
 288 #define NO_CONTEXT     -1
 289 
 290 extern inline void remove_from_ctx_list(struct ctx_list *entry)
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 291 {
 292         entry->next->prev = entry->prev;
 293         entry->prev->next = entry->next;
 294 }
 295 
 296 extern inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
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 297 {
 298         entry->next = head;
 299         (entry->prev = head->prev)->next = entry;
 300         head->prev = entry;
 301 }
 302 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
 303 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
 304 
 305 #endif /* !(_SPARC_PGTABLE_H) */

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