1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_IA64_PGTABLE_H
3 #define _ASM_IA64_PGTABLE_H
4
5 /*
6 * This file contains the functions and defines necessary to modify and use
7 * the IA-64 page table tree.
8 *
9 * This hopefully works with any (fixed) IA-64 page-size, as defined
10 * in <asm/page.h>.
11 *
12 * Copyright (C) 1998-2005 Hewlett-Packard Co
13 * David Mosberger-Tang <davidm@hpl.hp.com>
14 */
15
16
17 #include <asm/mman.h>
18 #include <asm/page.h>
19 #include <asm/processor.h>
20 #include <asm/types.h>
21
22 #define IA64_MAX_PHYS_BITS 50 /* max. number of physical address bits (architected) */
23
24 /*
25 * First, define the various bits in a PTE. Note that the PTE format
26 * matches the VHPT short format, the firt doubleword of the VHPD long
27 * format, and the first doubleword of the TLB insertion format.
28 */
29 #define _PAGE_P_BIT 0
30 #define _PAGE_A_BIT 5
31 #define _PAGE_D_BIT 6
32
33 #define _PAGE_P (1 << _PAGE_P_BIT) /* page present bit */
34 #define _PAGE_MA_WB (0x0 << 2) /* write back memory attribute */
35 #define _PAGE_MA_UC (0x4 << 2) /* uncacheable memory attribute */
36 #define _PAGE_MA_UCE (0x5 << 2) /* UC exported attribute */
37 #define _PAGE_MA_WC (0x6 << 2) /* write coalescing memory attribute */
38 #define _PAGE_MA_NAT (0x7 << 2) /* not-a-thing attribute */
39 #define _PAGE_MA_MASK (0x7 << 2)
40 #define _PAGE_PL_0 (0 << 7) /* privilege level 0 (kernel) */
41 #define _PAGE_PL_1 (1 << 7) /* privilege level 1 (unused) */
42 #define _PAGE_PL_2 (2 << 7) /* privilege level 2 (unused) */
43 #define _PAGE_PL_3 (3 << 7) /* privilege level 3 (user) */
44 #define _PAGE_PL_MASK (3 << 7)
45 #define _PAGE_AR_R (0 << 9) /* read only */
46 #define _PAGE_AR_RX (1 << 9) /* read & execute */
47 #define _PAGE_AR_RW (2 << 9) /* read & write */
48 #define _PAGE_AR_RWX (3 << 9) /* read, write & execute */
49 #define _PAGE_AR_R_RW (4 << 9) /* read / read & write */
50 #define _PAGE_AR_RX_RWX (5 << 9) /* read & exec / read, write & exec */
51 #define _PAGE_AR_RWX_RW (6 << 9) /* read, write & exec / read & write */
52 #define _PAGE_AR_X_RX (7 << 9) /* exec & promote / read & exec */
53 #define _PAGE_AR_MASK (7 << 9)
54 #define _PAGE_AR_SHIFT 9
55 #define _PAGE_A (1 << _PAGE_A_BIT) /* page accessed bit */
56 #define _PAGE_D (1 << _PAGE_D_BIT) /* page dirty bit */
57 #define _PAGE_PPN_MASK (((__IA64_UL(1) << IA64_MAX_PHYS_BITS) - 1) & ~0xfffUL)
58 #define _PAGE_ED (__IA64_UL(1) << 52) /* exception deferral */
59 #define _PAGE_PROTNONE (__IA64_UL(1) << 63)
60
61 #define _PFN_MASK _PAGE_PPN_MASK
62 /* Mask of bits which may be changed by pte_modify(); the odd bits are there for _PAGE_PROTNONE */
63 #define _PAGE_CHG_MASK (_PAGE_P | _PAGE_PROTNONE | _PAGE_PL_MASK | _PAGE_AR_MASK | _PAGE_ED)
64
65 #define _PAGE_SIZE_4K 12
66 #define _PAGE_SIZE_8K 13
67 #define _PAGE_SIZE_16K 14
68 #define _PAGE_SIZE_64K 16
69 #define _PAGE_SIZE_256K 18
70 #define _PAGE_SIZE_1M 20
71 #define _PAGE_SIZE_4M 22
72 #define _PAGE_SIZE_16M 24
73 #define _PAGE_SIZE_64M 26
74 #define _PAGE_SIZE_256M 28
75 #define _PAGE_SIZE_1G 30
76 #define _PAGE_SIZE_4G 32
77
78 #define __ACCESS_BITS _PAGE_ED | _PAGE_A | _PAGE_P | _PAGE_MA_WB
79 #define __DIRTY_BITS_NO_ED _PAGE_A | _PAGE_P | _PAGE_D | _PAGE_MA_WB
80 #define __DIRTY_BITS _PAGE_ED | __DIRTY_BITS_NO_ED
81
82 /*
83 * How many pointers will a page table level hold expressed in shift
84 */
85 #define PTRS_PER_PTD_SHIFT (PAGE_SHIFT-3)
86
87 /*
88 * Definitions for fourth level:
89 */
90 #define PTRS_PER_PTE (__IA64_UL(1) << (PTRS_PER_PTD_SHIFT))
91
92 /*
93 * Definitions for third level:
94 *
95 * PMD_SHIFT determines the size of the area a third-level page table
96 * can map.
97 */
98 #define PMD_SHIFT (PAGE_SHIFT + (PTRS_PER_PTD_SHIFT))
99 #define PMD_SIZE (1UL << PMD_SHIFT)
100 #define PMD_MASK (~(PMD_SIZE-1))
101 #define PTRS_PER_PMD (1UL << (PTRS_PER_PTD_SHIFT))
102
103 #if CONFIG_PGTABLE_LEVELS == 4
104 /*
105 * Definitions for second level:
106 *
107 * PUD_SHIFT determines the size of the area a second-level page table
108 * can map.
109 */
110 #define PUD_SHIFT (PMD_SHIFT + (PTRS_PER_PTD_SHIFT))
111 #define PUD_SIZE (1UL << PUD_SHIFT)
112 #define PUD_MASK (~(PUD_SIZE-1))
113 #define PTRS_PER_PUD (1UL << (PTRS_PER_PTD_SHIFT))
114 #endif
115
116 /*
117 * Definitions for first level:
118 *
119 * PGDIR_SHIFT determines what a first-level page table entry can map.
120 */
121 #if CONFIG_PGTABLE_LEVELS == 4
122 #define PGDIR_SHIFT (PUD_SHIFT + (PTRS_PER_PTD_SHIFT))
123 #else
124 #define PGDIR_SHIFT (PMD_SHIFT + (PTRS_PER_PTD_SHIFT))
125 #endif
126 #define PGDIR_SIZE (__IA64_UL(1) << PGDIR_SHIFT)
127 #define PGDIR_MASK (~(PGDIR_SIZE-1))
128 #define PTRS_PER_PGD_SHIFT PTRS_PER_PTD_SHIFT
129 #define PTRS_PER_PGD (1UL << PTRS_PER_PGD_SHIFT)
130 #define USER_PTRS_PER_PGD (5*PTRS_PER_PGD/8) /* regions 0-4 are user regions */
131 #define FIRST_USER_ADDRESS 0UL
132
133 /*
134 * All the normal masks have the "page accessed" bits on, as any time
135 * they are used, the page is accessed. They are cleared only by the
136 * page-out routines.
137 */
138 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_A)
139 #define PAGE_SHARED __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RW)
140 #define PAGE_READONLY __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_R)
141 #define PAGE_COPY __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_R)
142 #define PAGE_COPY_EXEC __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX)
143 #define PAGE_GATE __pgprot(__ACCESS_BITS | _PAGE_PL_0 | _PAGE_AR_X_RX)
144 #define PAGE_KERNEL __pgprot(__DIRTY_BITS | _PAGE_PL_0 | _PAGE_AR_RWX)
145 #define PAGE_KERNELRX __pgprot(__ACCESS_BITS | _PAGE_PL_0 | _PAGE_AR_RX)
146 #define PAGE_KERNEL_UC __pgprot(__DIRTY_BITS | _PAGE_PL_0 | _PAGE_AR_RWX | \
147 _PAGE_MA_UC)
148
149 # ifndef __ASSEMBLY__
150
151 #include <linux/sched/mm.h> /* for mm_struct */
152 #include <linux/bitops.h>
153 #include <asm/cacheflush.h>
154 #include <asm/mmu_context.h>
155
156 /*
157 * Next come the mappings that determine how mmap() protection bits
158 * (PROT_EXEC, PROT_READ, PROT_WRITE, PROT_NONE) get implemented. The
159 * _P version gets used for a private shared memory segment, the _S
160 * version gets used for a shared memory segment with MAP_SHARED on.
161 * In a private shared memory segment, we do a copy-on-write if a task
162 * attempts to write to the page.
163 */
164 /* xwr */
165 #define __P000 PAGE_NONE
166 #define __P001 PAGE_READONLY
167 #define __P010 PAGE_READONLY /* write to priv pg -> copy & make writable */
168 #define __P011 PAGE_READONLY /* ditto */
169 #define __P100 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_X_RX)
170 #define __P101 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX)
171 #define __P110 PAGE_COPY_EXEC
172 #define __P111 PAGE_COPY_EXEC
173
174 #define __S000 PAGE_NONE
175 #define __S001 PAGE_READONLY
176 #define __S010 PAGE_SHARED /* we don't have (and don't need) write-only */
177 #define __S011 PAGE_SHARED
178 #define __S100 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_X_RX)
179 #define __S101 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX)
180 #define __S110 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RWX)
181 #define __S111 __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RWX)
182
183 #define pgd_ERROR(e) printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
184 #if CONFIG_PGTABLE_LEVELS == 4
185 #define pud_ERROR(e) printk("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
186 #endif
187 #define pmd_ERROR(e) printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
188 #define pte_ERROR(e) printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
189
190
191 /*
192 * Some definitions to translate between mem_map, PTEs, and page addresses:
193 */
194
195
196 /* Quick test to see if ADDR is a (potentially) valid physical address. */
197 static inline long
ia64_phys_addr_valid(unsigned long addr)198 ia64_phys_addr_valid (unsigned long addr)
199 {
200 return (addr & (local_cpu_data->unimpl_pa_mask)) == 0;
201 }
202
203 /*
204 * kern_addr_valid(ADDR) tests if ADDR is pointing to valid kernel
205 * memory. For the return value to be meaningful, ADDR must be >=
206 * PAGE_OFFSET. This operation can be relatively expensive (e.g.,
207 * require a hash-, or multi-level tree-lookup or something of that
208 * sort) but it guarantees to return TRUE only if accessing the page
209 * at that address does not cause an error. Note that there may be
210 * addresses for which kern_addr_valid() returns FALSE even though an
211 * access would not cause an error (e.g., this is typically true for
212 * memory mapped I/O regions.
213 *
214 * XXX Need to implement this for IA-64.
215 */
216 #define kern_addr_valid(addr) (1)
217
218
219 /*
220 * Now come the defines and routines to manage and access the three-level
221 * page table.
222 */
223
224
225 #define VMALLOC_START (RGN_BASE(RGN_GATE) + 0x200000000UL)
226 #ifdef CONFIG_VIRTUAL_MEM_MAP
227 # define VMALLOC_END_INIT (RGN_BASE(RGN_GATE) + (1UL << (4*PAGE_SHIFT - 9)))
228 extern unsigned long VMALLOC_END;
229 #else
230 #if defined(CONFIG_SPARSEMEM) && defined(CONFIG_SPARSEMEM_VMEMMAP)
231 /* SPARSEMEM_VMEMMAP uses half of vmalloc... */
232 # define VMALLOC_END (RGN_BASE(RGN_GATE) + (1UL << (4*PAGE_SHIFT - 10)))
233 # define vmemmap ((struct page *)VMALLOC_END)
234 #else
235 # define VMALLOC_END (RGN_BASE(RGN_GATE) + (1UL << (4*PAGE_SHIFT - 9)))
236 #endif
237 #endif
238
239 /* fs/proc/kcore.c */
240 #define kc_vaddr_to_offset(v) ((v) - RGN_BASE(RGN_GATE))
241 #define kc_offset_to_vaddr(o) ((o) + RGN_BASE(RGN_GATE))
242
243 #define RGN_MAP_SHIFT (PGDIR_SHIFT + PTRS_PER_PGD_SHIFT - 3)
244 #define RGN_MAP_LIMIT ((1UL << RGN_MAP_SHIFT) - PAGE_SIZE) /* per region addr limit */
245
246 /*
247 * Conversion functions: convert page frame number (pfn) and a protection value to a page
248 * table entry (pte).
249 */
250 #define pfn_pte(pfn, pgprot) \
251 ({ pte_t __pte; pte_val(__pte) = ((pfn) << PAGE_SHIFT) | pgprot_val(pgprot); __pte; })
252
253 /* Extract pfn from pte. */
254 #define pte_pfn(_pte) ((pte_val(_pte) & _PFN_MASK) >> PAGE_SHIFT)
255
256 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
257
258 /* This takes a physical page address that is used by the remapping functions */
259 #define mk_pte_phys(physpage, pgprot) \
260 ({ pte_t __pte; pte_val(__pte) = physpage + pgprot_val(pgprot); __pte; })
261
262 #define pte_modify(_pte, newprot) \
263 (__pte((pte_val(_pte) & ~_PAGE_CHG_MASK) | (pgprot_val(newprot) & _PAGE_CHG_MASK)))
264
265 #define pte_none(pte) (!pte_val(pte))
266 #define pte_present(pte) (pte_val(pte) & (_PAGE_P | _PAGE_PROTNONE))
267 #define pte_clear(mm,addr,pte) (pte_val(*(pte)) = 0UL)
268 /* pte_page() returns the "struct page *" corresponding to the PTE: */
269 #define pte_page(pte) virt_to_page(((pte_val(pte) & _PFN_MASK) + PAGE_OFFSET))
270
271 #define pmd_none(pmd) (!pmd_val(pmd))
272 #define pmd_bad(pmd) (!ia64_phys_addr_valid(pmd_val(pmd)))
273 #define pmd_present(pmd) (pmd_val(pmd) != 0UL)
274 #define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0UL)
275 #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & _PFN_MASK))
276 #define pmd_page(pmd) virt_to_page((pmd_val(pmd) + PAGE_OFFSET))
277
278 #define pud_none(pud) (!pud_val(pud))
279 #define pud_bad(pud) (!ia64_phys_addr_valid(pud_val(pud)))
280 #define pud_present(pud) (pud_val(pud) != 0UL)
281 #define pud_clear(pudp) (pud_val(*(pudp)) = 0UL)
282 #define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & _PFN_MASK))
283 #define pud_page(pud) virt_to_page((pud_val(pud) + PAGE_OFFSET))
284
285 #if CONFIG_PGTABLE_LEVELS == 4
286 #define p4d_none(p4d) (!p4d_val(p4d))
287 #define p4d_bad(p4d) (!ia64_phys_addr_valid(p4d_val(p4d)))
288 #define p4d_present(p4d) (p4d_val(p4d) != 0UL)
289 #define p4d_clear(p4dp) (p4d_val(*(p4dp)) = 0UL)
290 #define p4d_page_vaddr(p4d) ((unsigned long) __va(p4d_val(p4d) & _PFN_MASK))
291 #define p4d_page(p4d) virt_to_page((p4d_val(p4d) + PAGE_OFFSET))
292 #endif
293
294 /*
295 * The following have defined behavior only work if pte_present() is true.
296 */
297 #define pte_write(pte) ((unsigned) (((pte_val(pte) & _PAGE_AR_MASK) >> _PAGE_AR_SHIFT) - 2) <= 4)
298 #define pte_exec(pte) ((pte_val(pte) & _PAGE_AR_RX) != 0)
299 #define pte_dirty(pte) ((pte_val(pte) & _PAGE_D) != 0)
300 #define pte_young(pte) ((pte_val(pte) & _PAGE_A) != 0)
301
302 /*
303 * Note: we convert AR_RWX to AR_RX and AR_RW to AR_R by clearing the 2nd bit in the
304 * access rights:
305 */
306 #define pte_wrprotect(pte) (__pte(pte_val(pte) & ~_PAGE_AR_RW))
307 #define pte_mkwrite(pte) (__pte(pte_val(pte) | _PAGE_AR_RW))
308 #define pte_mkold(pte) (__pte(pte_val(pte) & ~_PAGE_A))
309 #define pte_mkyoung(pte) (__pte(pte_val(pte) | _PAGE_A))
310 #define pte_mkclean(pte) (__pte(pte_val(pte) & ~_PAGE_D))
311 #define pte_mkdirty(pte) (__pte(pte_val(pte) | _PAGE_D))
312 #define pte_mkhuge(pte) (__pte(pte_val(pte)))
313
314 /*
315 * Because ia64's Icache and Dcache is not coherent (on a cpu), we need to
316 * sync icache and dcache when we insert *new* executable page.
317 * __ia64_sync_icache_dcache() check Pg_arch_1 bit and flush icache
318 * if necessary.
319 *
320 * set_pte() is also called by the kernel, but we can expect that the kernel
321 * flushes icache explicitly if necessary.
322 */
323 #define pte_present_exec_user(pte)\
324 ((pte_val(pte) & (_PAGE_P | _PAGE_PL_MASK | _PAGE_AR_RX)) == \
325 (_PAGE_P | _PAGE_PL_3 | _PAGE_AR_RX))
326
327 extern void __ia64_sync_icache_dcache(pte_t pteval);
set_pte(pte_t * ptep,pte_t pteval)328 static inline void set_pte(pte_t *ptep, pte_t pteval)
329 {
330 /* page is present && page is user && page is executable
331 * && (page swapin or new page or page migraton
332 * || copy_on_write with page copying.)
333 */
334 if (pte_present_exec_user(pteval) &&
335 (!pte_present(*ptep) ||
336 pte_pfn(*ptep) != pte_pfn(pteval)))
337 /* load_module() calles flush_icache_range() explicitly*/
338 __ia64_sync_icache_dcache(pteval);
339 *ptep = pteval;
340 }
341
342 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
343
344 /*
345 * Make page protection values cacheable, uncacheable, or write-
346 * combining. Note that "protection" is really a misnomer here as the
347 * protection value contains the memory attribute bits, dirty bits, and
348 * various other bits as well.
349 */
350 #define pgprot_cacheable(prot) __pgprot((pgprot_val(prot) & ~_PAGE_MA_MASK) | _PAGE_MA_WB)
351 #define pgprot_noncached(prot) __pgprot((pgprot_val(prot) & ~_PAGE_MA_MASK) | _PAGE_MA_UC)
352 #define pgprot_writecombine(prot) __pgprot((pgprot_val(prot) & ~_PAGE_MA_MASK) | _PAGE_MA_WC)
353
354 struct file;
355 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
356 unsigned long size, pgprot_t vma_prot);
357 #define __HAVE_PHYS_MEM_ACCESS_PROT
358
359 static inline unsigned long
pgd_index(unsigned long address)360 pgd_index (unsigned long address)
361 {
362 unsigned long region = address >> 61;
363 unsigned long l1index = (address >> PGDIR_SHIFT) & ((PTRS_PER_PGD >> 3) - 1);
364
365 return (region << (PAGE_SHIFT - 6)) | l1index;
366 }
367 #define pgd_index pgd_index
368
369 /*
370 * In the kernel's mapped region we know everything is in region number 5, so
371 * as an optimisation its PGD already points to the area for that region.
372 * However, this also means that we cannot use pgd_index() and we must
373 * never add the region here.
374 */
375 #define pgd_offset_k(addr) \
376 (init_mm.pgd + (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)))
377
378 /* Look up a pgd entry in the gate area. On IA-64, the gate-area
379 resides in the kernel-mapped segment, hence we use pgd_offset_k()
380 here. */
381 #define pgd_offset_gate(mm, addr) pgd_offset_k(addr)
382
383 /* atomic versions of the some PTE manipulations: */
384
385 static inline int
ptep_test_and_clear_young(struct vm_area_struct * vma,unsigned long addr,pte_t * ptep)386 ptep_test_and_clear_young (struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
387 {
388 #ifdef CONFIG_SMP
389 if (!pte_young(*ptep))
390 return 0;
391 return test_and_clear_bit(_PAGE_A_BIT, ptep);
392 #else
393 pte_t pte = *ptep;
394 if (!pte_young(pte))
395 return 0;
396 set_pte_at(vma->vm_mm, addr, ptep, pte_mkold(pte));
397 return 1;
398 #endif
399 }
400
401 static inline pte_t
ptep_get_and_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)402 ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
403 {
404 #ifdef CONFIG_SMP
405 return __pte(xchg((long *) ptep, 0));
406 #else
407 pte_t pte = *ptep;
408 pte_clear(mm, addr, ptep);
409 return pte;
410 #endif
411 }
412
413 static inline void
ptep_set_wrprotect(struct mm_struct * mm,unsigned long addr,pte_t * ptep)414 ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
415 {
416 #ifdef CONFIG_SMP
417 unsigned long new, old;
418
419 do {
420 old = pte_val(*ptep);
421 new = pte_val(pte_wrprotect(__pte (old)));
422 } while (cmpxchg((unsigned long *) ptep, old, new) != old);
423 #else
424 pte_t old_pte = *ptep;
425 set_pte_at(mm, addr, ptep, pte_wrprotect(old_pte));
426 #endif
427 }
428
429 static inline int
pte_same(pte_t a,pte_t b)430 pte_same (pte_t a, pte_t b)
431 {
432 return pte_val(a) == pte_val(b);
433 }
434
435 #define update_mmu_cache(vma, address, ptep) do { } while (0)
436
437 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
438 extern void paging_init (void);
439
440 /*
441 * Note: The macros below rely on the fact that MAX_SWAPFILES_SHIFT <= number of
442 * bits in the swap-type field of the swap pte. It would be nice to
443 * enforce that, but we can't easily include <linux/swap.h> here.
444 * (Of course, better still would be to define MAX_SWAPFILES_SHIFT here...).
445 *
446 * Format of swap pte:
447 * bit 0 : present bit (must be zero)
448 * bits 1- 7: swap-type
449 * bits 8-62: swap offset
450 * bit 63 : _PAGE_PROTNONE bit
451 */
452 #define __swp_type(entry) (((entry).val >> 1) & 0x7f)
453 #define __swp_offset(entry) (((entry).val << 1) >> 9)
454 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 1) | ((long) (offset) << 8) })
455 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
456 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
457
458 /*
459 * ZERO_PAGE is a global shared page that is always zero: used
460 * for zero-mapped memory areas etc..
461 */
462 extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
463 extern struct page *zero_page_memmap_ptr;
464 #define ZERO_PAGE(vaddr) (zero_page_memmap_ptr)
465
466 /* We provide our own get_unmapped_area to cope with VA holes for userland */
467 #define HAVE_ARCH_UNMAPPED_AREA
468
469 #ifdef CONFIG_HUGETLB_PAGE
470 #define HUGETLB_PGDIR_SHIFT (HPAGE_SHIFT + 2*(PAGE_SHIFT-3))
471 #define HUGETLB_PGDIR_SIZE (__IA64_UL(1) << HUGETLB_PGDIR_SHIFT)
472 #define HUGETLB_PGDIR_MASK (~(HUGETLB_PGDIR_SIZE-1))
473 #endif
474
475
476 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
477 /*
478 * Update PTEP with ENTRY, which is guaranteed to be a less
479 * restrictive PTE. That is, ENTRY may have the ACCESSED, DIRTY, and
480 * WRITABLE bits turned on, when the value at PTEP did not. The
481 * WRITABLE bit may only be turned if SAFELY_WRITABLE is TRUE.
482 *
483 * SAFELY_WRITABLE is TRUE if we can update the value at PTEP without
484 * having to worry about races. On SMP machines, there are only two
485 * cases where this is true:
486 *
487 * (1) *PTEP has the PRESENT bit turned OFF
488 * (2) ENTRY has the DIRTY bit turned ON
489 *
490 * On ia64, we could implement this routine with a cmpxchg()-loop
491 * which ORs in the _PAGE_A/_PAGE_D bit if they're set in ENTRY.
492 * However, like on x86, we can get a more streamlined version by
493 * observing that it is OK to drop ACCESSED bit updates when
494 * SAFELY_WRITABLE is FALSE. Besides being rare, all that would do is
495 * result in an extra Access-bit fault, which would then turn on the
496 * ACCESSED bit in the low-level fault handler (iaccess_bit or
497 * daccess_bit in ivt.S).
498 */
499 #ifdef CONFIG_SMP
500 # define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \
501 ({ \
502 int __changed = !pte_same(*(__ptep), __entry); \
503 if (__changed && __safely_writable) { \
504 set_pte(__ptep, __entry); \
505 flush_tlb_page(__vma, __addr); \
506 } \
507 __changed; \
508 })
509 #else
510 # define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \
511 ({ \
512 int __changed = !pte_same(*(__ptep), __entry); \
513 if (__changed) { \
514 set_pte_at((__vma)->vm_mm, (__addr), __ptep, __entry); \
515 flush_tlb_page(__vma, __addr); \
516 } \
517 __changed; \
518 })
519 #endif
520
521 # ifdef CONFIG_VIRTUAL_MEM_MAP
522 /* arch mem_map init routine is needed due to holes in a virtual mem_map */
523 extern void memmap_init (unsigned long size, int nid, unsigned long zone,
524 unsigned long start_pfn);
525 # endif /* CONFIG_VIRTUAL_MEM_MAP */
526 # endif /* !__ASSEMBLY__ */
527
528 /*
529 * Identity-mapped regions use a large page size. We'll call such large pages
530 * "granules". If you can think of a better name that's unambiguous, let me
531 * know...
532 */
533 #if defined(CONFIG_IA64_GRANULE_64MB)
534 # define IA64_GRANULE_SHIFT _PAGE_SIZE_64M
535 #elif defined(CONFIG_IA64_GRANULE_16MB)
536 # define IA64_GRANULE_SHIFT _PAGE_SIZE_16M
537 #endif
538 #define IA64_GRANULE_SIZE (1 << IA64_GRANULE_SHIFT)
539 /*
540 * log2() of the page size we use to map the kernel image (IA64_TR_KERNEL):
541 */
542 #define KERNEL_TR_PAGE_SHIFT _PAGE_SIZE_64M
543 #define KERNEL_TR_PAGE_SIZE (1 << KERNEL_TR_PAGE_SHIFT)
544
545 /* These tell get_user_pages() that the first gate page is accessible from user-level. */
546 #define FIXADDR_USER_START GATE_ADDR
547 #ifdef HAVE_BUGGY_SEGREL
548 # define FIXADDR_USER_END (GATE_ADDR + 2*PAGE_SIZE)
549 #else
550 # define FIXADDR_USER_END (GATE_ADDR + 2*PERCPU_PAGE_SIZE)
551 #endif
552
553 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
554 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
555 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
556 #define __HAVE_ARCH_PTE_SAME
557 #define __HAVE_ARCH_PGD_OFFSET_GATE
558
559
560 #if CONFIG_PGTABLE_LEVELS == 3
561 #include <asm-generic/pgtable-nopud.h>
562 #endif
563 #include <asm-generic/pgtable-nop4d.h>
564
565 #endif /* _ASM_IA64_PGTABLE_H */
566
