blob: da805e970844a1d9dab8210062e8c67cb5ac8805 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _ASM_M32R_PGTABLE_H
2#define _ASM_M32R_PGTABLE_H
3
4#include <asm-generic/4level-fixup.h>
5
6#ifdef __KERNEL__
7/*
8 * The Linux memory management assumes a three-level page table setup. On
9 * the M32R, we use that, but "fold" the mid level into the top-level page
10 * table, so that we physically have the same two-level page table as the
11 * M32R mmu expects.
12 *
13 * This file contains the functions and defines necessary to modify and use
14 * the M32R page table tree.
15 */
16
17/* CAUTION!: If you change macro definitions in this file, you might have to
18 * change arch/m32r/mmu.S manually.
19 */
20
21#ifndef __ASSEMBLY__
22
23#include <linux/config.h>
24#include <linux/threads.h>
25#include <asm/processor.h>
26#include <asm/addrspace.h>
27#include <asm/bitops.h>
28#include <asm/page.h>
29
30extern pgd_t swapper_pg_dir[1024];
31extern void paging_init(void);
32
33/*
34 * ZERO_PAGE is a global shared page that is always zero: used
35 * for zero-mapped memory areas etc..
36 */
37extern unsigned long empty_zero_page[1024];
38#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
39
40#endif /* !__ASSEMBLY__ */
41
42#ifndef __ASSEMBLY__
43#include <asm/pgtable-2level.h>
44#endif
45
46#define pgtable_cache_init() do { } while (0)
47
48#define PMD_SIZE (1UL << PMD_SHIFT)
49#define PMD_MASK (~(PMD_SIZE - 1))
50#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
51#define PGDIR_MASK (~(PGDIR_SIZE - 1))
52
53#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
Hugh Dickinsd455a362005-04-19 13:29:23 -070054#define FIRST_USER_ADDRESS 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56#ifndef __ASSEMBLY__
57/* Just any arbitrary offset to the start of the vmalloc VM area: the
58 * current 8MB value just means that there will be a 8MB "hole" after the
59 * physical memory until the kernel virtual memory starts. That means that
60 * any out-of-bounds memory accesses will hopefully be caught.
61 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
62 * area for the same reason. ;)
63 */
64#define VMALLOC_START KSEG2
65#define VMALLOC_END KSEG3
66
67/*
68 * M32R TLB format
69 *
70 * [0] [1:19] [20:23] [24:31]
71 * +-----------------------+----+-------------+
72 * | VPN |0000| ASID |
73 * +-----------------------+----+-------------+
74 * +-+---------------------+----+-+---+-+-+-+-+
75 * |0 PPN |0000|N|AC |L|G|V| |
76 * +-+---------------------+----+-+---+-+-+-+-+
77 * RWX
78 */
79
80#define _PAGE_BIT_DIRTY 0 /* software: page changed */
81#define _PAGE_BIT_FILE 0 /* when !present: nonlinear file
82 mapping */
83#define _PAGE_BIT_PRESENT 1 /* Valid: page is valid */
84#define _PAGE_BIT_GLOBAL 2 /* Global */
85#define _PAGE_BIT_LARGE 3 /* Large */
86#define _PAGE_BIT_EXEC 4 /* Execute */
87#define _PAGE_BIT_WRITE 5 /* Write */
88#define _PAGE_BIT_READ 6 /* Read */
89#define _PAGE_BIT_NONCACHABLE 7 /* Non cachable */
90#define _PAGE_BIT_ACCESSED 8 /* software: page referenced */
91#define _PAGE_BIT_PROTNONE 9 /* software: if not present */
92
93#define _PAGE_DIRTY (1UL << _PAGE_BIT_DIRTY)
94#define _PAGE_FILE (1UL << _PAGE_BIT_FILE)
95#define _PAGE_PRESENT (1UL << _PAGE_BIT_PRESENT)
96#define _PAGE_GLOBAL (1UL << _PAGE_BIT_GLOBAL)
97#define _PAGE_LARGE (1UL << _PAGE_BIT_LARGE)
98#define _PAGE_EXEC (1UL << _PAGE_BIT_EXEC)
99#define _PAGE_WRITE (1UL << _PAGE_BIT_WRITE)
100#define _PAGE_READ (1UL << _PAGE_BIT_READ)
101#define _PAGE_NONCACHABLE (1UL << _PAGE_BIT_NONCACHABLE)
102#define _PAGE_ACCESSED (1UL << _PAGE_BIT_ACCESSED)
103#define _PAGE_PROTNONE (1UL << _PAGE_BIT_PROTNONE)
104
105#define _PAGE_TABLE \
106 ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
107 | _PAGE_DIRTY )
108#define _KERNPG_TABLE \
109 ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
110 | _PAGE_DIRTY )
111#define _PAGE_CHG_MASK \
112 ( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY )
113
114#ifdef CONFIG_MMU
115#define PAGE_NONE \
116 __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
117#define PAGE_SHARED \
118 __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)
119#define PAGE_SHARED_EXEC \
120 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \
121 | _PAGE_ACCESSED)
122#define PAGE_COPY \
123 __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
124#define PAGE_COPY_EXEC \
125 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
126#define PAGE_READONLY \
127 __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
128#define PAGE_READONLY_EXEC \
129 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
130
131#define __PAGE_KERNEL \
132 ( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \
133 | _PAGE_ACCESSED )
134#define __PAGE_KERNEL_RO ( __PAGE_KERNEL & ~_PAGE_WRITE )
135#define __PAGE_KERNEL_NOCACHE ( __PAGE_KERNEL | _PAGE_NONCACHABLE)
136
137#define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
138
139#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
140#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
141#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
142
143#else
144#define PAGE_NONE __pgprot(0)
145#define PAGE_SHARED __pgprot(0)
146#define PAGE_SHARED_EXEC __pgprot(0)
147#define PAGE_COPY __pgprot(0)
148#define PAGE_COPY_EXEC __pgprot(0)
149#define PAGE_READONLY __pgprot(0)
150#define PAGE_READONLY_EXEC __pgprot(0)
151
152#define PAGE_KERNEL __pgprot(0)
153#define PAGE_KERNEL_RO __pgprot(0)
154#define PAGE_KERNEL_NOCACHE __pgprot(0)
155#endif /* CONFIG_MMU */
156
157 /* xwr */
158#define __P000 PAGE_NONE
159#define __P001 PAGE_READONLY
160#define __P010 PAGE_COPY
161#define __P011 PAGE_COPY
162#define __P100 PAGE_READONLY_EXEC
163#define __P101 PAGE_READONLY_EXEC
164#define __P110 PAGE_COPY_EXEC
165#define __P111 PAGE_COPY_EXEC
166
167#define __S000 PAGE_NONE
168#define __S001 PAGE_READONLY
169#define __S010 PAGE_SHARED
170#define __S011 PAGE_SHARED
171#define __S100 PAGE_READONLY_EXEC
172#define __S101 PAGE_READONLY_EXEC
173#define __S110 PAGE_SHARED_EXEC
174#define __S111 PAGE_SHARED_EXEC
175
176/* page table for 0-4MB for everybody */
177
178#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
179#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
180
181#define pmd_none(x) (!pmd_val(x))
182#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
183#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
184#define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)
185
186#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT))
187
188/*
189 * The following only work if pte_present() is true.
190 * Undefined behaviour if not..
191 */
192static inline int pte_read(pte_t pte)
193{
194 return pte_val(pte) & _PAGE_READ;
195}
196
197static inline int pte_exec(pte_t pte)
198{
199 return pte_val(pte) & _PAGE_EXEC;
200}
201
202static inline int pte_dirty(pte_t pte)
203{
204 return pte_val(pte) & _PAGE_DIRTY;
205}
206
207static inline int pte_young(pte_t pte)
208{
209 return pte_val(pte) & _PAGE_ACCESSED;
210}
211
212static inline int pte_write(pte_t pte)
213{
214 return pte_val(pte) & _PAGE_WRITE;
215}
216
217/*
218 * The following only works if pte_present() is not true.
219 */
220static inline int pte_file(pte_t pte)
221{
222 return pte_val(pte) & _PAGE_FILE;
223}
224
225static inline pte_t pte_rdprotect(pte_t pte)
226{
227 pte_val(pte) &= ~_PAGE_READ;
228 return pte;
229}
230
231static inline pte_t pte_exprotect(pte_t pte)
232{
233 pte_val(pte) &= ~_PAGE_EXEC;
234 return pte;
235}
236
237static inline pte_t pte_mkclean(pte_t pte)
238{
239 pte_val(pte) &= ~_PAGE_DIRTY;
240 return pte;
241}
242
243static inline pte_t pte_mkold(pte_t pte)
244{
245 pte_val(pte) &= ~_PAGE_ACCESSED;
246 return pte;
247}
248
249static inline pte_t pte_wrprotect(pte_t pte)
250{
251 pte_val(pte) &= ~_PAGE_WRITE;
252 return pte;
253}
254
255static inline pte_t pte_mkread(pte_t pte)
256{
257 pte_val(pte) |= _PAGE_READ;
258 return pte;
259}
260
261static inline pte_t pte_mkexec(pte_t pte)
262{
263 pte_val(pte) |= _PAGE_EXEC;
264 return pte;
265}
266
267static inline pte_t pte_mkdirty(pte_t pte)
268{
269 pte_val(pte) |= _PAGE_DIRTY;
270 return pte;
271}
272
273static inline pte_t pte_mkyoung(pte_t pte)
274{
275 pte_val(pte) |= _PAGE_ACCESSED;
276 return pte;
277}
278
279static inline pte_t pte_mkwrite(pte_t pte)
280{
281 pte_val(pte) |= _PAGE_WRITE;
282 return pte;
283}
284
285static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
286{
287 return test_and_clear_bit(_PAGE_BIT_DIRTY, ptep);
288}
289
290static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
291{
292 return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
293}
294
295static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
296{
297 clear_bit(_PAGE_BIT_WRITE, ptep);
298}
299
300/*
301 * Macro and implementation to make a page protection as uncachable.
302 */
303static inline pgprot_t pgprot_noncached(pgprot_t _prot)
304{
305 unsigned long prot = pgprot_val(_prot);
306
307 prot |= _PAGE_NONCACHABLE;
308 return __pgprot(prot);
309}
310
311#define pgprot_writecombine(prot) pgprot_noncached(prot)
312
313/*
314 * Conversion functions: convert a page and protection to a page entry,
315 * and a page entry and page directory to the page they refer to.
316 */
317#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), pgprot)
318
319static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
320{
321 set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \
322 | pgprot_val(newprot)));
323
324 return pte;
325}
326
327#define page_pte(page) page_pte_prot(page, __pgprot(0))
328
329/*
330 * Conversion functions: convert a page and protection to a page entry,
331 * and a page entry and page directory to the page they refer to.
332 */
333
334static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
335{
336 pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
337}
338
339#define pmd_page_kernel(pmd) \
340 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
341
342#ifndef CONFIG_DISCONTIGMEM
343#define pmd_page(pmd) (mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
344#endif /* !CONFIG_DISCONTIGMEM */
345
346/* to find an entry in a page-table-directory. */
347#define pgd_index(address) \
348 (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
349
350#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
351
352/* to find an entry in a kernel page-table-directory */
353#define pgd_offset_k(address) pgd_offset(&init_mm, address)
354
355#define pmd_index(address) \
356 (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
357
358#define pte_index(address) \
359 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
360#define pte_offset_kernel(dir, address) \
361 ((pte_t *)pmd_page_kernel(*(dir)) + pte_index(address))
362#define pte_offset_map(dir, address) \
363 ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
364#define pte_offset_map_nested(dir, address) pte_offset_map(dir, address)
365#define pte_unmap(pte) do { } while (0)
366#define pte_unmap_nested(pte) do { } while (0)
367
368/* Encode and de-code a swap entry */
369#define __swp_type(x) (((x).val >> 2) & 0x3f)
370#define __swp_offset(x) ((x).val >> 10)
371#define __swp_entry(type, offset) \
372 ((swp_entry_t) { ((type) << 2) | ((offset) << 10) })
373#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
374#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
375
376#endif /* !__ASSEMBLY__ */
377
378/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
379#define kern_addr_valid(addr) (1)
380
381#define io_remap_page_range(vma, vaddr, paddr, size, prot) \
382 remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
383
384#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
385 remap_pfn_range(vma, vaddr, pfn, size, prot)
386
387#define MK_IOSPACE_PFN(space, pfn) (pfn)
388#define GET_IOSPACE(pfn) 0
389#define GET_PFN(pfn) (pfn)
390
391#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
392#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
393#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
394#define __HAVE_ARCH_PTEP_SET_WRPROTECT
395#define __HAVE_ARCH_PTE_SAME
396#include <asm-generic/pgtable.h>
397
398#endif /* __KERNEL__ */
399
400#endif /* _ASM_M32R_PGTABLE_H */