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1#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/threads.h>
24#include <linux/bitops.h>
25#include <asm/processor.h>
26#include <asm/addrspace.h>
27#include <asm/page.h>
28
29struct mm_struct;
30struct vm_area_struct;
31
32extern pgd_t swapper_pg_dir[1024];
33extern void paging_init(void);
34
35/*
36 * ZERO_PAGE is a global shared page that is always zero: used
37 * for zero-mapped memory areas etc..
38 */
39extern unsigned long empty_zero_page[1024];
40#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
41
42#endif /* !__ASSEMBLY__ */
43
44#ifndef __ASSEMBLY__
45#include <asm/pgtable-2level.h>
46#endif
47
48#define pgtable_cache_init() do { } while (0)
49
50#define PMD_SIZE (1UL << PMD_SHIFT)
51#define PMD_MASK (~(PMD_SIZE - 1))
52#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
53#define PGDIR_MASK (~(PGDIR_SIZE - 1))
54
55#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
56#define FIRST_USER_ADDRESS 0
57
58#ifndef __ASSEMBLY__
59/* Just any arbitrary offset to the start of the vmalloc VM area: the
60 * current 8MB value just means that there will be a 8MB "hole" after the
61 * physical memory until the kernel virtual memory starts. That means that
62 * any out-of-bounds memory accesses will hopefully be caught.
63 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
64 * area for the same reason. ;)
65 */
66#define VMALLOC_START KSEG2
67#define VMALLOC_END KSEG3
68
69/*
70 * M32R TLB format
71 *
72 * [0] [1:19] [20:23] [24:31]
73 * +-----------------------+----+-------------+
74 * | VPN |0000| ASID |
75 * +-----------------------+----+-------------+
76 * +-+---------------------+----+-+---+-+-+-+-+
77 * |0 PPN |0000|N|AC |L|G|V| |
78 * +-+---------------------+----+-+---+-+-+-+-+
79 * RWX
80 */
81
82#define _PAGE_BIT_DIRTY 0 /* software: page changed */
83#define _PAGE_BIT_FILE 0 /* when !present: nonlinear file
84 mapping */
85#define _PAGE_BIT_PRESENT 1 /* Valid: page is valid */
86#define _PAGE_BIT_GLOBAL 2 /* Global */
87#define _PAGE_BIT_LARGE 3 /* Large */
88#define _PAGE_BIT_EXEC 4 /* Execute */
89#define _PAGE_BIT_WRITE 5 /* Write */
90#define _PAGE_BIT_READ 6 /* Read */
91#define _PAGE_BIT_NONCACHABLE 7 /* Non cachable */
92#define _PAGE_BIT_ACCESSED 8 /* software: page referenced */
93#define _PAGE_BIT_PROTNONE 9 /* software: if not present */
94
95#define _PAGE_DIRTY (1UL << _PAGE_BIT_DIRTY)
96#define _PAGE_FILE (1UL << _PAGE_BIT_FILE)
97#define _PAGE_PRESENT (1UL << _PAGE_BIT_PRESENT)
98#define _PAGE_GLOBAL (1UL << _PAGE_BIT_GLOBAL)
99#define _PAGE_LARGE (1UL << _PAGE_BIT_LARGE)
100#define _PAGE_EXEC (1UL << _PAGE_BIT_EXEC)
101#define _PAGE_WRITE (1UL << _PAGE_BIT_WRITE)
102#define _PAGE_READ (1UL << _PAGE_BIT_READ)
103#define _PAGE_NONCACHABLE (1UL << _PAGE_BIT_NONCACHABLE)
104#define _PAGE_ACCESSED (1UL << _PAGE_BIT_ACCESSED)
105#define _PAGE_PROTNONE (1UL << _PAGE_BIT_PROTNONE)
106
107#define _PAGE_TABLE \
108 ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
109 | _PAGE_DIRTY )
110#define _KERNPG_TABLE \
111 ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
112 | _PAGE_DIRTY )
113#define _PAGE_CHG_MASK \
114 ( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY )
115
116#ifdef CONFIG_MMU
117#define PAGE_NONE \
118 __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
119#define PAGE_SHARED \
120 __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)
121#define PAGE_SHARED_EXEC \
122 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \
123 | _PAGE_ACCESSED)
124#define PAGE_COPY \
125 __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
126#define PAGE_COPY_EXEC \
127 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
128#define PAGE_READONLY \
129 __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
130#define PAGE_READONLY_EXEC \
131 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
132
133#define __PAGE_KERNEL \
134 ( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \
135 | _PAGE_ACCESSED )
136#define __PAGE_KERNEL_RO ( __PAGE_KERNEL & ~_PAGE_WRITE )
137#define __PAGE_KERNEL_NOCACHE ( __PAGE_KERNEL | _PAGE_NONCACHABLE)
138
139#define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
140
141#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
142#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
143#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
144
145#else
146#define PAGE_NONE __pgprot(0)
147#define PAGE_SHARED __pgprot(0)
148#define PAGE_SHARED_EXEC __pgprot(0)
149#define PAGE_COPY __pgprot(0)
150#define PAGE_COPY_EXEC __pgprot(0)
151#define PAGE_READONLY __pgprot(0)
152#define PAGE_READONLY_EXEC __pgprot(0)
153
154#define PAGE_KERNEL __pgprot(0)
155#define PAGE_KERNEL_RO __pgprot(0)
156#define PAGE_KERNEL_NOCACHE __pgprot(0)
157#endif /* CONFIG_MMU */
158
159 /* xwr */
160#define __P000 PAGE_NONE
161#define __P001 PAGE_READONLY
162#define __P010 PAGE_COPY
163#define __P011 PAGE_COPY
164#define __P100 PAGE_READONLY_EXEC
165#define __P101 PAGE_READONLY_EXEC
166#define __P110 PAGE_COPY_EXEC
167#define __P111 PAGE_COPY_EXEC
168
169#define __S000 PAGE_NONE
170#define __S001 PAGE_READONLY
171#define __S010 PAGE_SHARED
172#define __S011 PAGE_SHARED
173#define __S100 PAGE_READONLY_EXEC
174#define __S101 PAGE_READONLY_EXEC
175#define __S110 PAGE_SHARED_EXEC
176#define __S111 PAGE_SHARED_EXEC
177
178/* page table for 0-4MB for everybody */
179
180#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
181#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
182
183#define pmd_none(x) (!pmd_val(x))
184#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
185#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
186#define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)
187
188#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT))
189
190/*
191 * The following only work if pte_present() is true.
192 * Undefined behaviour if not..
193 */
194static inline int pte_dirty(pte_t pte)
195{
196 return pte_val(pte) & _PAGE_DIRTY;
197}
198
199static inline int pte_young(pte_t pte)
200{
201 return pte_val(pte) & _PAGE_ACCESSED;
202}
203
204static inline int pte_write(pte_t pte)
205{
206 return pte_val(pte) & _PAGE_WRITE;
207}
208
209/*
210 * The following only works if pte_present() is not true.
211 */
212static inline int pte_file(pte_t pte)
213{
214 return pte_val(pte) & _PAGE_FILE;
215}
216
217static inline int pte_special(pte_t pte)
218{
219 return 0;
220}
221
222static inline pte_t pte_mkclean(pte_t pte)
223{
224 pte_val(pte) &= ~_PAGE_DIRTY;
225 return pte;
226}
227
228static inline pte_t pte_mkold(pte_t pte)
229{
230 pte_val(pte) &= ~_PAGE_ACCESSED;
231 return pte;
232}
233
234static inline pte_t pte_wrprotect(pte_t pte)
235{
236 pte_val(pte) &= ~_PAGE_WRITE;
237 return pte;
238}
239
240static inline pte_t pte_mkdirty(pte_t pte)
241{
242 pte_val(pte) |= _PAGE_DIRTY;
243 return pte;
244}
245
246static inline pte_t pte_mkyoung(pte_t pte)
247{
248 pte_val(pte) |= _PAGE_ACCESSED;
249 return pte;
250}
251
252static inline pte_t pte_mkwrite(pte_t pte)
253{
254 pte_val(pte) |= _PAGE_WRITE;
255 return pte;
256}
257
258static inline pte_t pte_mkspecial(pte_t pte)
259{
260 return pte;
261}
262
263static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
264{
265 return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
266}
267
268static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
269{
270 clear_bit(_PAGE_BIT_WRITE, ptep);
271}
272
273/*
274 * Macro and implementation to make a page protection as uncachable.
275 */
276static inline pgprot_t pgprot_noncached(pgprot_t _prot)
277{
278 unsigned long prot = pgprot_val(_prot);
279
280 prot |= _PAGE_NONCACHABLE;
281 return __pgprot(prot);
282}
283
284#define pgprot_writecombine(prot) pgprot_noncached(prot)
285
286/*
287 * Conversion functions: convert a page and protection to a page entry,
288 * and a page entry and page directory to the page they refer to.
289 */
290#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), pgprot)
291
292static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
293{
294 set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \
295 | pgprot_val(newprot)));
296
297 return pte;
298}
299
300/*
301 * Conversion functions: convert a page and protection to a page entry,
302 * and a page entry and page directory to the page they refer to.
303 */
304
305static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
306{
307 pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
308}
309
310#define pmd_page_vaddr(pmd) \
311 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
312
313#ifndef CONFIG_DISCONTIGMEM
314#define pmd_page(pmd) (mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
315#endif /* !CONFIG_DISCONTIGMEM */
316
317/* to find an entry in a page-table-directory. */
318#define pgd_index(address) \
319 (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
320
321#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
322
323/* to find an entry in a kernel page-table-directory */
324#define pgd_offset_k(address) pgd_offset(&init_mm, address)
325
326#define pmd_index(address) \
327 (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
328
329#define pte_index(address) \
330 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
331#define pte_offset_kernel(dir, address) \
332 ((pte_t *)pmd_page_vaddr(*(dir)) + pte_index(address))
333#define pte_offset_map(dir, address) \
334 ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
335#define pte_unmap(pte) do { } while (0)
336
337/* Encode and de-code a swap entry */
338#define __swp_type(x) (((x).val >> 2) & 0x1f)
339#define __swp_offset(x) ((x).val >> 10)
340#define __swp_entry(type, offset) \
341 ((swp_entry_t) { ((type) << 2) | ((offset) << 10) })
342#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
343#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
344
345#endif /* !__ASSEMBLY__ */
346
347/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
348#define kern_addr_valid(addr) (1)
349
350#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
351 remap_pfn_range(vma, vaddr, pfn, size, prot)
352
353#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
354#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
355#define __HAVE_ARCH_PTEP_SET_WRPROTECT
356#define __HAVE_ARCH_PTE_SAME
357#include <asm-generic/pgtable.h>
358
359#endif /* __KERNEL__ */
360
361#endif /* _ASM_M32R_PGTABLE_H */