1#ifndef _ALPHA_PGTABLE_H
2#define _ALPHA_PGTABLE_H
3
4#include <asm-generic/4level-fixup.h>
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12
13#include <linux/mmzone.h>
14
15#include <asm/page.h>
16#include <asm/processor.h>
17#include <asm/machvec.h>
18#include <asm/setup.h>
19
20struct mm_struct;
21struct vm_area_struct;
22
23
24
25
26
27#define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
28#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
29
30
31#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3))
32#define PMD_SIZE (1UL << PMD_SHIFT)
33#define PMD_MASK (~(PMD_SIZE-1))
34
35
36#define PGDIR_SHIFT (PAGE_SHIFT + 2*(PAGE_SHIFT-3))
37#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
38#define PGDIR_MASK (~(PGDIR_SIZE-1))
39
40
41
42
43
44#define PTRS_PER_PTE (1UL << (PAGE_SHIFT-3))
45#define PTRS_PER_PMD (1UL << (PAGE_SHIFT-3))
46#define PTRS_PER_PGD (1UL << (PAGE_SHIFT-3))
47#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
48#define FIRST_USER_ADDRESS 0UL
49
50
51#define PTRS_PER_PAGE (1UL << (PAGE_SHIFT-3))
52
53#ifdef CONFIG_ALPHA_LARGE_VMALLOC
54#define VMALLOC_START 0xfffffe0000000000
55#else
56#define VMALLOC_START (-2*PGDIR_SIZE)
57#endif
58#define VMALLOC_END (-PGDIR_SIZE)
59
60
61
62
63#define _PAGE_VALID 0x0001
64#define _PAGE_FOR 0x0002
65#define _PAGE_FOW 0x0004
66#define _PAGE_FOE 0x0008
67#define _PAGE_ASM 0x0010
68#define _PAGE_KRE 0x0100
69#define _PAGE_URE 0x0200
70#define _PAGE_KWE 0x1000
71#define _PAGE_UWE 0x2000
72
73
74#define _PAGE_DIRTY 0x20000
75#define _PAGE_ACCESSED 0x40000
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87
88#define __DIRTY_BITS (_PAGE_DIRTY | _PAGE_KWE | _PAGE_UWE)
89#define __ACCESS_BITS (_PAGE_ACCESSED | _PAGE_KRE | _PAGE_URE)
90
91#define _PFN_MASK 0xFFFFFFFF00000000UL
92
93#define _PAGE_TABLE (_PAGE_VALID | __DIRTY_BITS | __ACCESS_BITS)
94#define _PAGE_CHG_MASK (_PFN_MASK | __DIRTY_BITS | __ACCESS_BITS)
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99
100#define PAGE_NONE __pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOR | _PAGE_FOW | _PAGE_FOE)
101#define PAGE_SHARED __pgprot(_PAGE_VALID | __ACCESS_BITS)
102#define PAGE_COPY __pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW)
103#define PAGE_READONLY __pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW)
104#define PAGE_KERNEL __pgprot(_PAGE_VALID | _PAGE_ASM | _PAGE_KRE | _PAGE_KWE)
105
106#define _PAGE_NORMAL(x) __pgprot(_PAGE_VALID | __ACCESS_BITS | (x))
107
108#define _PAGE_P(x) _PAGE_NORMAL((x) | (((x) & _PAGE_FOW)?0:_PAGE_FOW))
109#define _PAGE_S(x) _PAGE_NORMAL(x)
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118
119#define __P000 _PAGE_P(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)
120#define __P001 _PAGE_P(_PAGE_FOE | _PAGE_FOW)
121#define __P010 _PAGE_P(_PAGE_FOE)
122#define __P011 _PAGE_P(_PAGE_FOE)
123#define __P100 _PAGE_P(_PAGE_FOW | _PAGE_FOR)
124#define __P101 _PAGE_P(_PAGE_FOW)
125#define __P110 _PAGE_P(0)
126#define __P111 _PAGE_P(0)
127
128#define __S000 _PAGE_S(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)
129#define __S001 _PAGE_S(_PAGE_FOE | _PAGE_FOW)
130#define __S010 _PAGE_S(_PAGE_FOE)
131#define __S011 _PAGE_S(_PAGE_FOE)
132#define __S100 _PAGE_S(_PAGE_FOW | _PAGE_FOR)
133#define __S101 _PAGE_S(_PAGE_FOW)
134#define __S110 _PAGE_S(0)
135#define __S111 _PAGE_S(0)
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139
140
141#define pgprot_noncached(prot) (prot)
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149
150extern pte_t __bad_page(void);
151extern pmd_t * __bad_pagetable(void);
152
153extern unsigned long __zero_page(void);
154
155#define BAD_PAGETABLE __bad_pagetable()
156#define BAD_PAGE __bad_page()
157#define ZERO_PAGE(vaddr) (virt_to_page(ZERO_PGE))
158
159
160#define BITS_PER_PTR (8*sizeof(unsigned long))
161
162
163#define PTR_MASK (~(sizeof(void*)-1))
164
165
166#define SIZEOF_PTR_LOG2 3
167
168
169#define PAGE_PTR(address) \
170 ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
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187
188#if defined(CONFIG_ALPHA_GENERIC) && defined(USE_48_BIT_KSEG)
189#error "EV6-only feature in a generic kernel"
190#endif
191#if defined(CONFIG_ALPHA_GENERIC) || \
192 (defined(CONFIG_ALPHA_EV6) && !defined(USE_48_BIT_KSEG))
193#define KSEG_PFN (0xc0000000000UL >> PAGE_SHIFT)
194#define PHYS_TWIDDLE(pfn) \
195 ((((pfn) & KSEG_PFN) == (0x40000000000UL >> PAGE_SHIFT)) \
196 ? ((pfn) ^= KSEG_PFN) : (pfn))
197#else
198#define PHYS_TWIDDLE(pfn) (pfn)
199#endif
200
201
202
203
204
205#ifndef CONFIG_DISCONTIGMEM
206#define page_to_pa(page) (((page) - mem_map) << PAGE_SHIFT)
207
208#define pte_pfn(pte) (pte_val(pte) >> 32)
209#define pte_page(pte) pfn_to_page(pte_pfn(pte))
210#define mk_pte(page, pgprot) \
211({ \
212 pte_t pte; \
213 \
214 pte_val(pte) = (page_to_pfn(page) << 32) | pgprot_val(pgprot); \
215 pte; \
216})
217#endif
218
219extern inline pte_t pfn_pte(unsigned long physpfn, pgprot_t pgprot)
220{ pte_t pte; pte_val(pte) = (PHYS_TWIDDLE(physpfn) << 32) | pgprot_val(pgprot); return pte; }
221
222extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
223{ pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
224
225extern inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
226{ pmd_val(*pmdp) = _PAGE_TABLE | ((((unsigned long) ptep) - PAGE_OFFSET) << (32-PAGE_SHIFT)); }
227
228extern inline void pgd_set(pgd_t * pgdp, pmd_t * pmdp)
229{ pgd_val(*pgdp) = _PAGE_TABLE | ((((unsigned long) pmdp) - PAGE_OFFSET) << (32-PAGE_SHIFT)); }
230
231
232extern inline unsigned long
233pmd_page_vaddr(pmd_t pmd)
234{
235 return ((pmd_val(pmd) & _PFN_MASK) >> (32-PAGE_SHIFT)) + PAGE_OFFSET;
236}
237
238#ifndef CONFIG_DISCONTIGMEM
239#define pmd_page(pmd) (mem_map + ((pmd_val(pmd) & _PFN_MASK) >> 32))
240#define pgd_page(pgd) (mem_map + ((pgd_val(pgd) & _PFN_MASK) >> 32))
241#endif
242
243extern inline unsigned long pgd_page_vaddr(pgd_t pgd)
244{ return PAGE_OFFSET + ((pgd_val(pgd) & _PFN_MASK) >> (32-PAGE_SHIFT)); }
245
246extern inline int pte_none(pte_t pte) { return !pte_val(pte); }
247extern inline int pte_present(pte_t pte) { return pte_val(pte) & _PAGE_VALID; }
248extern inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
249{
250 pte_val(*ptep) = 0;
251}
252
253extern inline int pmd_none(pmd_t pmd) { return !pmd_val(pmd); }
254extern inline int pmd_bad(pmd_t pmd) { return (pmd_val(pmd) & ~_PFN_MASK) != _PAGE_TABLE; }
255extern inline int pmd_present(pmd_t pmd) { return pmd_val(pmd) & _PAGE_VALID; }
256extern inline void pmd_clear(pmd_t * pmdp) { pmd_val(*pmdp) = 0; }
257
258extern inline int pgd_none(pgd_t pgd) { return !pgd_val(pgd); }
259extern inline int pgd_bad(pgd_t pgd) { return (pgd_val(pgd) & ~_PFN_MASK) != _PAGE_TABLE; }
260extern inline int pgd_present(pgd_t pgd) { return pgd_val(pgd) & _PAGE_VALID; }
261extern inline void pgd_clear(pgd_t * pgdp) { pgd_val(*pgdp) = 0; }
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267extern inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_FOW); }
268extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
269extern inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
270extern inline int pte_special(pte_t pte) { return 0; }
271
272extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOW; return pte; }
273extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(__DIRTY_BITS); return pte; }
274extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(__ACCESS_BITS); return pte; }
275extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_FOW; return pte; }
276extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= __DIRTY_BITS; return pte; }
277extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; return pte; }
278extern inline pte_t pte_mkspecial(pte_t pte) { return pte; }
279
280#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
281
282
283#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
284
285
286#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
287#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
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303extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
304{
305 pmd_t *ret = (pmd_t *) pgd_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1));
306 smp_read_barrier_depends();
307 return ret;
308}
309
310
311extern inline pte_t * pte_offset_kernel(pmd_t * dir, unsigned long address)
312{
313 pte_t *ret = (pte_t *) pmd_page_vaddr(*dir)
314 + ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1));
315 smp_read_barrier_depends();
316 return ret;
317}
318
319#define pte_offset_map(dir,addr) pte_offset_kernel((dir),(addr))
320#define pte_unmap(pte) do { } while (0)
321
322extern pgd_t swapper_pg_dir[1024];
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328extern inline void update_mmu_cache(struct vm_area_struct * vma,
329 unsigned long address, pte_t *ptep)
330{
331}
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336
337extern inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
338{ pte_t pte; pte_val(pte) = (type << 32) | (offset << 40); return pte; }
339
340#define __swp_type(x) (((x).val >> 32) & 0xff)
341#define __swp_offset(x) ((x).val >> 40)
342#define __swp_entry(type, off) ((swp_entry_t) { pte_val(mk_swap_pte((type), (off))) })
343#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
344#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
345
346#ifndef CONFIG_DISCONTIGMEM
347#define kern_addr_valid(addr) (1)
348#endif
349
350#define pte_ERROR(e) \
351 printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
352#define pmd_ERROR(e) \
353 printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
354#define pgd_ERROR(e) \
355 printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
356
357extern void paging_init(void);
358
359#include <asm-generic/pgtable.h>
360
361
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363
364#define pgtable_cache_init() do { } while (0)
365
366
367#define HAVE_ARCH_UNMAPPED_AREA
368
369#endif
370