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-rw-r--r--arch/nios2/include/asm/pgalloc.h86
-rw-r--r--arch/nios2/include/asm/pgtable-bits.h35
-rw-r--r--arch/nios2/include/asm/pgtable.h310
-rw-r--r--arch/nios2/mm/pgtable.c74
4 files changed, 505 insertions, 0 deletions
diff --git a/arch/nios2/include/asm/pgalloc.h b/arch/nios2/include/asm/pgalloc.h
new file mode 100644
index 000000000000..6e2985e0a7b9
--- /dev/null
+++ b/arch/nios2/include/asm/pgalloc.h
@@ -0,0 +1,86 @@
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8 */
9
10#ifndef _ASM_NIOS2_PGALLOC_H
11#define _ASM_NIOS2_PGALLOC_H
12
13#include <linux/mm.h>
14
15static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
16 pte_t *pte)
17{
18 set_pmd(pmd, __pmd((unsigned long)pte));
19}
20
21static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
22 pgtable_t pte)
23{
24 set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
25}
26#define pmd_pgtable(pmd) pmd_page(pmd)
27
28/*
29 * Initialize a new pmd table with invalid pointers.
30 */
31extern void pmd_init(unsigned long page, unsigned long pagetable);
32
33extern pgd_t *pgd_alloc(struct mm_struct *mm);
34
35static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
36{
37 free_pages((unsigned long)pgd, PGD_ORDER);
38}
39
40static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
41 unsigned long address)
42{
43 pte_t *pte;
44
45 pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO,
46 PTE_ORDER);
47
48 return pte;
49}
50
51static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
52 unsigned long address)
53{
54 struct page *pte;
55
56 pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
57 if (pte) {
58 if (!pgtable_page_ctor(pte)) {
59 __free_page(pte);
60 return NULL;
61 }
62 clear_highpage(pte);
63 }
64 return pte;
65}
66
67static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
68{
69 free_pages((unsigned long)pte, PTE_ORDER);
70}
71
72static inline void pte_free(struct mm_struct *mm, struct page *pte)
73{
74 pgtable_page_dtor(pte);
75 __free_pages(pte, PTE_ORDER);
76}
77
78#define __pte_free_tlb(tlb, pte, addr) \
79 do { \
80 pgtable_page_dtor(pte); \
81 tlb_remove_page((tlb), (pte)); \
82 } while (0)
83
84#define check_pgt_cache() do { } while (0)
85
86#endif /* _ASM_NIOS2_PGALLOC_H */
diff --git a/arch/nios2/include/asm/pgtable-bits.h b/arch/nios2/include/asm/pgtable-bits.h
new file mode 100644
index 000000000000..ce9e7069aa96
--- /dev/null
+++ b/arch/nios2/include/asm/pgtable-bits.h
@@ -0,0 +1,35 @@
1/*
2 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
3 * Copyright (C) 2009 Wind River Systems Inc
4 *
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
7 * for more details.
8 */
9
10#ifndef _ASM_NIOS2_PGTABLE_BITS_H
11#define _ASM_NIOS2_PGTABLE_BITS_H
12
13/*
14 * These are actual hardware defined protection bits in the tlbacc register
15 * which looks like this:
16 *
17 * 31 30 ... 26 25 24 23 22 21 20 19 18 ... 1 0
18 * ignored........ C R W X G PFN............
19 */
20#define _PAGE_GLOBAL (1<<20)
21#define _PAGE_EXEC (1<<21)
22#define _PAGE_WRITE (1<<22)
23#define _PAGE_READ (1<<23)
24#define _PAGE_CACHED (1<<24) /* C: data access cacheable */
25
26/*
27 * Software defined bits. They are ignored by the hardware and always read back
28 * as zero, but can be written as non-zero.
29 */
30#define _PAGE_PRESENT (1<<25) /* PTE contains a translation */
31#define _PAGE_ACCESSED (1<<26) /* page referenced */
32#define _PAGE_DIRTY (1<<27) /* dirty page */
33#define _PAGE_FILE (1<<28) /* PTE used for file mapping or swap */
34
35#endif /* _ASM_NIOS2_PGTABLE_BITS_H */
diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h
new file mode 100644
index 000000000000..ccbaffd47671
--- /dev/null
+++ b/arch/nios2/include/asm/pgtable.h
@@ -0,0 +1,310 @@
1/*
2 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
3 * Copyright (C) 2009 Wind River Systems Inc
4 *
5 * Based on asm/pgtable-32.h from mips which is:
6 *
7 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
8 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file "COPYING" in the main directory of this archive
12 * for more details.
13 */
14
15#ifndef _ASM_NIOS2_PGTABLE_H
16#define _ASM_NIOS2_PGTABLE_H
17
18#include <linux/io.h>
19#include <linux/bug.h>
20#include <asm/page.h>
21#include <asm/cacheflush.h>
22#include <asm/tlbflush.h>
23
24#include <asm/pgtable-bits.h>
25#include <asm-generic/pgtable-nopmd.h>
26
27#define FIRST_USER_ADDRESS 0
28
29#define VMALLOC_START CONFIG_NIOS2_KERNEL_MMU_REGION_BASE
30#define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1)
31
32struct mm_struct;
33
34/* Helper macro */
35#define MKP(x, w, r) __pgprot(_PAGE_PRESENT | _PAGE_CACHED | \
36 ((x) ? _PAGE_EXEC : 0) | \
37 ((r) ? _PAGE_READ : 0) | \
38 ((w) ? _PAGE_WRITE : 0))
39/*
40 * These are the macros that generic kernel code needs
41 * (to populate protection_map[])
42 */
43
44/* Remove W bit on private pages for COW support */
45#define __P000 MKP(0, 0, 0)
46#define __P001 MKP(0, 0, 1)
47#define __P010 MKP(0, 0, 0) /* COW */
48#define __P011 MKP(0, 0, 1) /* COW */
49#define __P100 MKP(1, 0, 0)
50#define __P101 MKP(1, 0, 1)
51#define __P110 MKP(1, 0, 0) /* COW */
52#define __P111 MKP(1, 0, 1) /* COW */
53
54/* Shared pages can have exact HW mapping */
55#define __S000 MKP(0, 0, 0)
56#define __S001 MKP(0, 0, 1)
57#define __S010 MKP(0, 1, 0)
58#define __S011 MKP(0, 1, 1)
59#define __S100 MKP(1, 0, 0)
60#define __S101 MKP(1, 0, 1)
61#define __S110 MKP(1, 1, 0)
62#define __S111 MKP(1, 1, 1)
63
64/* Used all over the kernel */
65#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
66 _PAGE_WRITE | _PAGE_EXEC | _PAGE_GLOBAL)
67
68#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
69 _PAGE_WRITE | _PAGE_ACCESSED)
70
71#define PAGE_COPY MKP(0, 0, 1)
72
73#define PGD_ORDER 0
74#define PTE_ORDER 0
75
76#define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
77#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
78
79#define USER_PTRS_PER_PGD \
80 (CONFIG_NIOS2_KERNEL_MMU_REGION_BASE / PGDIR_SIZE)
81
82#define PGDIR_SHIFT 22
83#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
84#define PGDIR_MASK (~(PGDIR_SIZE-1))
85
86/*
87 * ZERO_PAGE is a global shared page that is always zero: used
88 * for zero-mapped memory areas etc..
89 */
90extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
91#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
92
93extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
94extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
95
96/*
97 * (pmds are folded into puds so this doesn't get actually called,
98 * but the define is needed for a generic inline function.)
99 */
100static inline void set_pmd(pmd_t *pmdptr, pmd_t pmdval)
101{
102 pmdptr->pud.pgd.pgd = pmdval.pud.pgd.pgd;
103}
104
105/* to find an entry in a page-table-directory */
106#define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
107#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
108
109static inline int pte_write(pte_t pte) \
110 { return pte_val(pte) & _PAGE_WRITE; }
111static inline int pte_dirty(pte_t pte) \
112 { return pte_val(pte) & _PAGE_DIRTY; }
113static inline int pte_young(pte_t pte) \
114 { return pte_val(pte) & _PAGE_ACCESSED; }
115static inline int pte_file(pte_t pte) \
116 { return pte_val(pte) & _PAGE_FILE; }
117static inline int pte_special(pte_t pte) { return 0; }
118
119#define pgprot_noncached pgprot_noncached
120
121static inline pgprot_t pgprot_noncached(pgprot_t _prot)
122{
123 unsigned long prot = pgprot_val(_prot);
124
125 prot &= ~_PAGE_CACHED;
126
127 return __pgprot(prot);
128}
129
130static inline int pte_none(pte_t pte)
131{
132 return !(pte_val(pte) & ~(_PAGE_GLOBAL|0xf));
133}
134
135static inline int pte_present(pte_t pte) \
136 { return pte_val(pte) & _PAGE_PRESENT; }
137
138/*
139 * The following only work if pte_present() is true.
140 * Undefined behaviour if not..
141 */
142static inline pte_t pte_wrprotect(pte_t pte)
143{
144 pte_val(pte) &= ~_PAGE_WRITE;
145 return pte;
146}
147
148static inline pte_t pte_mkclean(pte_t pte)
149{
150 pte_val(pte) &= ~_PAGE_DIRTY;
151 return pte;
152}
153
154static inline pte_t pte_mkold(pte_t pte)
155{
156 pte_val(pte) &= ~_PAGE_ACCESSED;
157 return pte;
158}
159
160static inline pte_t pte_mkwrite(pte_t pte)
161{
162 pte_val(pte) |= _PAGE_WRITE;
163 return pte;
164}
165
166static inline pte_t pte_mkdirty(pte_t pte)
167{
168 pte_val(pte) |= _PAGE_DIRTY;
169 return pte;
170}
171
172static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
173
174static inline pte_t pte_mkyoung(pte_t pte)
175{
176 pte_val(pte) |= _PAGE_ACCESSED;
177 return pte;
178}
179
180static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
181{
182 const unsigned long mask = _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC;
183
184 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
185 return pte;
186}
187
188static inline int pmd_present(pmd_t pmd)
189{
190 return (pmd_val(pmd) != (unsigned long) invalid_pte_table)
191 && (pmd_val(pmd) != 0UL);
192}
193
194static inline void pmd_clear(pmd_t *pmdp)
195{
196 pmd_val(*pmdp) = (unsigned long) invalid_pte_table;
197}
198
199#define pte_pfn(pte) (pte_val(pte) & 0xfffff)
200#define pfn_pte(pfn, prot) (__pte(pfn | pgprot_val(prot)))
201#define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
202
203/*
204 * Store a linux PTE into the linux page table.
205 */
206static inline void set_pte(pte_t *ptep, pte_t pteval)
207{
208 *ptep = pteval;
209}
210
211static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
212 pte_t *ptep, pte_t pteval)
213{
214 unsigned long paddr = page_to_virt(pte_page(pteval));
215
216 flush_dcache_range(paddr, paddr + PAGE_SIZE);
217 set_pte(ptep, pteval);
218}
219
220static inline int pmd_none(pmd_t pmd)
221{
222 return (pmd_val(pmd) ==
223 (unsigned long) invalid_pte_table) || (pmd_val(pmd) == 0UL);
224}
225
226#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
227
228static inline void pte_clear(struct mm_struct *mm,
229 unsigned long addr, pte_t *ptep)
230{
231 pte_t null;
232
233 pte_val(null) = (addr >> PAGE_SHIFT) & 0xf;
234
235 set_pte_at(mm, addr, ptep, null);
236 flush_tlb_one(addr);
237}
238
239/*
240 * Conversion functions: convert a page and protection to a page entry,
241 * and a page entry and page directory to the page they refer to.
242 */
243#define mk_pte(page, prot) (pfn_pte(page_to_pfn(page), prot))
244
245#define pte_unmap(pte) do { } while (0)
246
247/*
248 * Conversion functions: convert a page and protection to a page entry,
249 * and a page entry and page directory to the page they refer to.
250 */
251#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
252#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
253#define pmd_page_vaddr(pmd) pmd_val(pmd)
254
255#define pte_offset_map(dir, addr) \
256 ((pte_t *) page_address(pmd_page(*dir)) + \
257 (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
258
259/* to find an entry in a kernel page-table-directory */
260#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
261
262/* Get the address to the PTE for a vaddr in specific directory */
263#define pte_offset_kernel(dir, addr) \
264 ((pte_t *) pmd_page_vaddr(*(dir)) + \
265 (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
266
267#define pte_ERROR(e) \
268 pr_err("%s:%d: bad pte %08lx.\n", \
269 __FILE__, __LINE__, pte_val(e))
270#define pgd_ERROR(e) \
271 pr_err("%s:%d: bad pgd %08lx.\n", \
272 __FILE__, __LINE__, pgd_val(e))
273
274/*
275 * Encode and decode a swap entry (must be !pte_none(pte) && !pte_present(pte)
276 * && !pte_file(pte)):
277 *
278 * 31 30 29 28 27 26 25 24 23 22 21 20 19 18 ... 1 0
279 * 0 0 0 0 type. 0 0 0 0 0 0 offset.........
280 *
281 * This gives us up to 2**2 = 4 swap files and 2**20 * 4K = 4G per swap file.
282 *
283 * Note that the offset field is always non-zero, thus !pte_none(pte) is always
284 * true.
285 */
286#define __swp_type(swp) (((swp).val >> 26) & 0x3)
287#define __swp_offset(swp) ((swp).val & 0xfffff)
288#define __swp_entry(type, off) ((swp_entry_t) { (((type) & 0x3) << 26) \
289 | ((off) & 0xfffff) })
290#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
291#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
292
293/* Encode and decode a nonlinear file mapping entry */
294#define PTE_FILE_MAX_BITS 25
295#define pte_to_pgoff(pte) (pte_val(pte) & 0x1ffffff)
296#define pgoff_to_pte(off) __pte(((off) & 0x1ffffff) | _PAGE_FILE)
297
298#define kern_addr_valid(addr) (1)
299
300#include <asm-generic/pgtable.h>
301
302#define pgtable_cache_init() do { } while (0)
303
304extern void __init paging_init(void);
305extern void __init mmu_init(void);
306
307extern void update_mmu_cache(struct vm_area_struct *vma,
308 unsigned long address, pte_t *pte);
309
310#endif /* _ASM_NIOS2_PGTABLE_H */
diff --git a/arch/nios2/mm/pgtable.c b/arch/nios2/mm/pgtable.c
new file mode 100644
index 000000000000..61e24a25f71a
--- /dev/null
+++ b/arch/nios2/mm/pgtable.c
@@ -0,0 +1,74 @@
1/*
2 * Copyright (C) 2009 Wind River Systems Inc
3 * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
4 *
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
7 * for more details.
8 */
9
10#include <linux/mm.h>
11#include <linux/sched.h>
12
13#include <asm/pgtable.h>
14#include <asm/cpuinfo.h>
15
16/* pteaddr:
17 * ptbase | vpn* | zero
18 * 31-22 | 21-2 | 1-0
19 *
20 * *vpn is preserved on double fault
21 *
22 * tlbacc:
23 * IG |*flags| pfn
24 * 31-25|24-20 | 19-0
25 *
26 * *crwxg
27 *
28 * tlbmisc:
29 * resv |way |rd | we|pid |dbl|bad|perm|d
30 * 31-24 |23-20 |19 | 20|17-4|3 |2 |1 |0
31 *
32 */
33
34/*
35 * Initialize a new pgd / pmd table with invalid pointers.
36 */
37static void pgd_init(pgd_t *pgd)
38{
39 unsigned long *p = (unsigned long *) pgd;
40 int i;
41
42 for (i = 0; i < USER_PTRS_PER_PGD; i += 8) {
43 p[i + 0] = (unsigned long) invalid_pte_table;
44 p[i + 1] = (unsigned long) invalid_pte_table;
45 p[i + 2] = (unsigned long) invalid_pte_table;
46 p[i + 3] = (unsigned long) invalid_pte_table;
47 p[i + 4] = (unsigned long) invalid_pte_table;
48 p[i + 5] = (unsigned long) invalid_pte_table;
49 p[i + 6] = (unsigned long) invalid_pte_table;
50 p[i + 7] = (unsigned long) invalid_pte_table;
51 }
52}
53
54pgd_t *pgd_alloc(struct mm_struct *mm)
55{
56 pgd_t *ret, *init;
57
58 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
59 if (ret) {
60 init = pgd_offset(&init_mm, 0UL);
61 pgd_init(ret);
62 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
63 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
64 }
65
66 return ret;
67}
68
69void __init pagetable_init(void)
70{
71 /* Initialize the entire pgd. */
72 pgd_init(swapper_pg_dir);
73 pgd_init(swapper_pg_dir + USER_PTRS_PER_PGD);
74}
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-24 18:35:38 -0500