1#ifndef _ASM_SCORE_PGTABLE_H
2#define _ASM_SCORE_PGTABLE_H
3
4#include <linux/const.h>
5#include <asm-generic/pgtable-nopmd.h>
6
7#include <asm/fixmap.h>
8#include <asm/setup.h>
9#include <asm/pgtable-bits.h>
10
11extern void load_pgd(unsigned long pg_dir);
12extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
13
14/* PGDIR_SHIFT determines what a third-level page table entry can map */
15#define PGDIR_SHIFT	22
16#define PGDIR_SIZE	(_AC(1, UL) << PGDIR_SHIFT)
17#define PGDIR_MASK	(~(PGDIR_SIZE - 1))
18
19/*
20 * Entries per page directory level: we use two-level, so
21 * we don't really have any PUD/PMD directory physically.
22 */
23#define PGD_ORDER	0
24#define PTE_ORDER	0
25
26#define PTRS_PER_PGD	1024
27#define PTRS_PER_PTE	1024
28
29#define USER_PTRS_PER_PGD	(0x80000000UL/PGDIR_SIZE)
30#define FIRST_USER_ADDRESS	0UL
31
32#define VMALLOC_START		(0xc0000000UL)
33
34#define PKMAP_BASE		(0xfd000000UL)
35
36#define VMALLOC_END		(FIXADDR_START - 2*PAGE_SIZE)
37
38#define pte_ERROR(e) \
39	printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
40		__FILE__, __LINE__, pte_val(e))
41#define pgd_ERROR(e) \
42	printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
43		__FILE__, __LINE__, pgd_val(e))
44
45/*
46 * Empty pgd/pmd entries point to the invalid_pte_table.
47 */
48static inline int pmd_none(pmd_t pmd)
49{
50	return pmd_val(pmd) == (unsigned long) invalid_pte_table;
51}
52
53#define pmd_bad(pmd)		(pmd_val(pmd) & ~PAGE_MASK)
54
55static inline int pmd_present(pmd_t pmd)
56{
57	return pmd_val(pmd) != (unsigned long) invalid_pte_table;
58}
59
60static inline void pmd_clear(pmd_t *pmdp)
61{
62	pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
63}
64
65#define pte_page(x)		pfn_to_page(pte_pfn(x))
66#define pte_pfn(x)		((unsigned long)((x).pte >> PAGE_SHIFT))
67#define pfn_pte(pfn, prot)	\
68	__pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
69
70#define __pgd_offset(address)	pgd_index(address)
71#define __pud_offset(address)	(((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
72#define __pmd_offset(address)	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
73
74/* to find an entry in a kernel page-table-directory */
75#define pgd_offset_k(address)	pgd_offset(&init_mm, address)
76#define pgd_index(address)	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
77
78/* to find an entry in a page-table-directory */
79#define pgd_offset(mm, addr)	((mm)->pgd + pgd_index(addr))
80
81/* Find an entry in the third-level page table.. */
82#define __pte_offset(address)		\
83	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
84#define pte_offset(dir, address)	\
85	((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
86#define pte_offset_kernel(dir, address)	\
87	((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
88
89#define pte_offset_map(dir, address)	\
90	((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
91#define pte_unmap(pte) ((void)(pte))
92
93#define __pte_to_swp_entry(pte)		\
94	((swp_entry_t) { pte_val(pte)})
95#define __swp_entry_to_pte(x)	((pte_t) {(x).val})
96
97#define pmd_phys(pmd)		__pa((void *)pmd_val(pmd))
98#define pmd_page(pmd)		(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
99#define mk_pte(page, prot)	pfn_pte(page_to_pfn(page), prot)
100static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
101
102#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
103#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
104#define pte_clear(mm, addr, xp)		\
105	do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
106
107/*
108 * The "pgd_xxx()" functions here are trivial for a folded two-level
109 * setup: the pgd is never bad, and a pmd always exists (as it's folded
110 * into the pgd entry)
111 */
112#define pgd_present(pgd)	(1)
113#define pgd_none(pgd)		(0)
114#define pgd_bad(pgd)		(0)
115#define pgd_clear(pgdp)		do { } while (0)
116
117#define kern_addr_valid(addr)	(1)
118#define pmd_page_vaddr(pmd)	pmd_val(pmd)
119
120#define pte_none(pte)		(!(pte_val(pte) & ~_PAGE_GLOBAL))
121#define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT)
122
123#define PAGE_NONE	__pgprot(_PAGE_PRESENT | _PAGE_CACHE)
124#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
125				_PAGE_CACHE)
126#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
127#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
128#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
129				_PAGE_GLOBAL | _PAGE_CACHE)
130#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
131				__WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)
132
133#define __P000	PAGE_NONE
134#define __P001	PAGE_READONLY
135#define __P010	PAGE_COPY
136#define __P011	PAGE_COPY
137#define __P100	PAGE_READONLY
138#define __P101	PAGE_READONLY
139#define __P110	PAGE_COPY
140#define __P111	PAGE_COPY
141
142#define __S000	PAGE_NONE
143#define __S001	PAGE_READONLY
144#define __S010	PAGE_SHARED
145#define __S011	PAGE_SHARED
146#define __S100	PAGE_READONLY
147#define __S101	PAGE_READONLY
148#define __S110	PAGE_SHARED
149#define __S111	PAGE_SHARED
150
151#define pgprot_noncached pgprot_noncached
152
153static inline pgprot_t pgprot_noncached(pgprot_t _prot)
154{
155	unsigned long prot = pgprot_val(_prot);
156
157	prot = (prot & ~_CACHE_MASK);
158
159	return __pgprot(prot);
160}
161
162#define __swp_type(x)		((x).val & 0x1f)
163#define __swp_offset(x) 	((x).val >> 10)
164#define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 10)})
165
166extern unsigned long empty_zero_page;
167extern unsigned long zero_page_mask;
168
169#define ZERO_PAGE(vaddr) \
170	(virt_to_page((void *)(empty_zero_page + \
171	 (((unsigned long)(vaddr)) & zero_page_mask))))
172
173#define pgtable_cache_init()	do {} while (0)
174
175#define arch_enter_lazy_cpu_mode()	do {} while (0)
176
177static inline int pte_write(pte_t pte)
178{
179	return pte_val(pte) & _PAGE_WRITE;
180}
181
182static inline int pte_dirty(pte_t pte)
183{
184	return pte_val(pte) & _PAGE_MODIFIED;
185}
186
187static inline int pte_young(pte_t pte)
188{
189	return pte_val(pte) & _PAGE_ACCESSED;
190}
191
192#define pte_special(pte)	(0)
193
194static inline pte_t pte_wrprotect(pte_t pte)
195{
196	pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
197	return pte;
198}
199
200static inline pte_t pte_mkclean(pte_t pte)
201{
202	pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
203	return pte;
204}
205
206static inline pte_t pte_mkold(pte_t pte)
207{
208	pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
209	return pte;
210}
211
212static inline pte_t pte_mkwrite(pte_t pte)
213{
214	pte_val(pte) |= _PAGE_WRITE;
215	if (pte_val(pte) & _PAGE_MODIFIED)
216		pte_val(pte) |= _PAGE_SILENT_WRITE;
217	return pte;
218}
219
220static inline pte_t pte_mkdirty(pte_t pte)
221{
222	pte_val(pte) |= _PAGE_MODIFIED;
223	if (pte_val(pte) & _PAGE_WRITE)
224		pte_val(pte) |= _PAGE_SILENT_WRITE;
225	return pte;
226}
227
228static inline pte_t pte_mkyoung(pte_t pte)
229{
230	pte_val(pte) |= _PAGE_ACCESSED;
231	if (pte_val(pte) & _PAGE_READ)
232		pte_val(pte) |= _PAGE_SILENT_READ;
233	return pte;
234}
235
236#define set_pmd(pmdptr, pmdval)		\
237	 do { *(pmdptr) = (pmdval); } while (0)
238#define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT)
239
240extern unsigned long pgd_current;
241extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
242extern void paging_init(void);
243
244static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
245{
246	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
247}
248
249extern void __update_tlb(struct vm_area_struct *vma,
250	unsigned long address,	pte_t pte);
251extern void __update_cache(struct vm_area_struct *vma,
252	unsigned long address,	pte_t pte);
253
254static inline void update_mmu_cache(struct vm_area_struct *vma,
255	unsigned long address, pte_t *ptep)
256{
257	pte_t pte = *ptep;
258	__update_tlb(vma, address, pte);
259	__update_cache(vma, address, pte);
260}
261
262#ifndef __ASSEMBLY__
263#include <asm-generic/pgtable.h>
264
265void setup_memory(void);
266#endif /* __ASSEMBLY__ */
267
268#endif /* _ASM_SCORE_PGTABLE_H */
269