1 #ifndef _ASM_M32R_PGTABLE_H
2 #define _ASM_M32R_PGTABLE_H
4 #include <asm-generic/4level-fixup.h>
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
13 * This file contains the functions and defines necessary to modify and use
14 * the M32R page table tree.
17 /* CAUTION!: If you change macro definitions in this file, you might have to
18 * change arch/m32r/mmu.S manually.
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>
31 struct vm_area_struct;
33 extern pgd_t swapper_pg_dir[1024];
34 extern void paging_init(void);
37 * ZERO_PAGE is a global shared page that is always zero: used
38 * for zero-mapped memory areas etc..
40 extern unsigned long empty_zero_page[1024];
41 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
43 #endif /* !__ASSEMBLY__ */
46 #include <asm/pgtable-2level.h>
49 #define pgtable_cache_init() do { } while (0)
51 #define PMD_SIZE (1UL << PMD_SHIFT)
52 #define PMD_MASK (~(PMD_SIZE - 1))
53 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
54 #define PGDIR_MASK (~(PGDIR_SIZE - 1))
56 #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
57 #define FIRST_USER_ADDRESS 0
60 /* Just any arbitrary offset to the start of the vmalloc VM area: the
61 * current 8MB value just means that there will be a 8MB "hole" after the
62 * physical memory until the kernel virtual memory starts. That means that
63 * any out-of-bounds memory accesses will hopefully be caught.
64 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
65 * area for the same reason. ;)
67 #define VMALLOC_START KSEG2
68 #define VMALLOC_END KSEG3
73 * [0] [1:19] [20:23] [24:31]
74 * +-----------------------+----+-------------+
76 * +-----------------------+----+-------------+
77 * +-+---------------------+----+-+---+-+-+-+-+
78 * |0 PPN |0000|N|AC |L|G|V| |
79 * +-+---------------------+----+-+---+-+-+-+-+
83 #define _PAGE_BIT_DIRTY 0 /* software: page changed */
84 #define _PAGE_BIT_FILE 0 /* when !present: nonlinear file
86 #define _PAGE_BIT_PRESENT 1 /* Valid: page is valid */
87 #define _PAGE_BIT_GLOBAL 2 /* Global */
88 #define _PAGE_BIT_LARGE 3 /* Large */
89 #define _PAGE_BIT_EXEC 4 /* Execute */
90 #define _PAGE_BIT_WRITE 5 /* Write */
91 #define _PAGE_BIT_READ 6 /* Read */
92 #define _PAGE_BIT_NONCACHABLE 7 /* Non cachable */
93 #define _PAGE_BIT_ACCESSED 8 /* software: page referenced */
94 #define _PAGE_BIT_PROTNONE 9 /* software: if not present */
96 #define _PAGE_DIRTY (1UL << _PAGE_BIT_DIRTY)
97 #define _PAGE_FILE (1UL << _PAGE_BIT_FILE)
98 #define _PAGE_PRESENT (1UL << _PAGE_BIT_PRESENT)
99 #define _PAGE_GLOBAL (1UL << _PAGE_BIT_GLOBAL)
100 #define _PAGE_LARGE (1UL << _PAGE_BIT_LARGE)
101 #define _PAGE_EXEC (1UL << _PAGE_BIT_EXEC)
102 #define _PAGE_WRITE (1UL << _PAGE_BIT_WRITE)
103 #define _PAGE_READ (1UL << _PAGE_BIT_READ)
104 #define _PAGE_NONCACHABLE (1UL << _PAGE_BIT_NONCACHABLE)
105 #define _PAGE_ACCESSED (1UL << _PAGE_BIT_ACCESSED)
106 #define _PAGE_PROTNONE (1UL << _PAGE_BIT_PROTNONE)
108 #define _PAGE_TABLE \
109 ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
111 #define _KERNPG_TABLE \
112 ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
114 #define _PAGE_CHG_MASK \
115 ( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY )
119 __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
120 #define PAGE_SHARED \
121 __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)
122 #define PAGE_SHARED_EXEC \
123 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \
126 __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
127 #define PAGE_COPY_EXEC \
128 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
129 #define PAGE_READONLY \
130 __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
131 #define PAGE_READONLY_EXEC \
132 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
134 #define __PAGE_KERNEL \
135 ( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \
137 #define __PAGE_KERNEL_RO ( __PAGE_KERNEL & ~_PAGE_WRITE )
138 #define __PAGE_KERNEL_NOCACHE ( __PAGE_KERNEL | _PAGE_NONCACHABLE)
140 #define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
142 #define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
143 #define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
144 #define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
147 #define PAGE_NONE __pgprot(0)
148 #define PAGE_SHARED __pgprot(0)
149 #define PAGE_SHARED_EXEC __pgprot(0)
150 #define PAGE_COPY __pgprot(0)
151 #define PAGE_COPY_EXEC __pgprot(0)
152 #define PAGE_READONLY __pgprot(0)
153 #define PAGE_READONLY_EXEC __pgprot(0)
155 #define PAGE_KERNEL __pgprot(0)
156 #define PAGE_KERNEL_RO __pgprot(0)
157 #define PAGE_KERNEL_NOCACHE __pgprot(0)
158 #endif /* CONFIG_MMU */
161 #define __P000 PAGE_NONE
162 #define __P001 PAGE_READONLY
163 #define __P010 PAGE_COPY
164 #define __P011 PAGE_COPY
165 #define __P100 PAGE_READONLY_EXEC
166 #define __P101 PAGE_READONLY_EXEC
167 #define __P110 PAGE_COPY_EXEC
168 #define __P111 PAGE_COPY_EXEC
170 #define __S000 PAGE_NONE
171 #define __S001 PAGE_READONLY
172 #define __S010 PAGE_SHARED
173 #define __S011 PAGE_SHARED
174 #define __S100 PAGE_READONLY_EXEC
175 #define __S101 PAGE_READONLY_EXEC
176 #define __S110 PAGE_SHARED_EXEC
177 #define __S111 PAGE_SHARED_EXEC
179 /* page table for 0-4MB for everybody */
181 #define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
182 #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
184 #define pmd_none(x) (!pmd_val(x))
185 #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
186 #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
187 #define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)
189 #define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT))
192 * The following only work if pte_present() is true.
193 * Undefined behaviour if not..
195 static inline int pte_read(pte_t pte)
197 return pte_val(pte) & _PAGE_READ;
200 static inline int pte_exec(pte_t pte)
202 return pte_val(pte) & _PAGE_EXEC;
205 static inline int pte_dirty(pte_t pte)
207 return pte_val(pte) & _PAGE_DIRTY;
210 static inline int pte_young(pte_t pte)
212 return pte_val(pte) & _PAGE_ACCESSED;
215 static inline int pte_write(pte_t pte)
217 return pte_val(pte) & _PAGE_WRITE;
221 * The following only works if pte_present() is not true.
223 static inline int pte_file(pte_t pte)
225 return pte_val(pte) & _PAGE_FILE;
228 static inline pte_t pte_rdprotect(pte_t pte)
230 pte_val(pte) &= ~_PAGE_READ;
234 static inline pte_t pte_exprotect(pte_t pte)
236 pte_val(pte) &= ~_PAGE_EXEC;
240 static inline pte_t pte_mkclean(pte_t pte)
242 pte_val(pte) &= ~_PAGE_DIRTY;
246 static inline pte_t pte_mkold(pte_t pte)
248 pte_val(pte) &= ~_PAGE_ACCESSED;
252 static inline pte_t pte_wrprotect(pte_t pte)
254 pte_val(pte) &= ~_PAGE_WRITE;
258 static inline pte_t pte_mkread(pte_t pte)
260 pte_val(pte) |= _PAGE_READ;
264 static inline pte_t pte_mkexec(pte_t pte)
266 pte_val(pte) |= _PAGE_EXEC;
270 static inline pte_t pte_mkdirty(pte_t pte)
272 pte_val(pte) |= _PAGE_DIRTY;
276 static inline pte_t pte_mkyoung(pte_t pte)
278 pte_val(pte) |= _PAGE_ACCESSED;
282 static inline pte_t pte_mkwrite(pte_t pte)
284 pte_val(pte) |= _PAGE_WRITE;
288 static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
290 return test_and_clear_bit(_PAGE_BIT_DIRTY, ptep);
293 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
295 return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
298 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
300 clear_bit(_PAGE_BIT_WRITE, ptep);
304 * Macro and implementation to make a page protection as uncachable.
306 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
308 unsigned long prot = pgprot_val(_prot);
310 prot |= _PAGE_NONCACHABLE;
311 return __pgprot(prot);
314 #define pgprot_writecombine(prot) pgprot_noncached(prot)
317 * Conversion functions: convert a page and protection to a page entry,
318 * and a page entry and page directory to the page they refer to.
320 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), pgprot)
322 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
324 set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \
325 | pgprot_val(newprot)));
331 * Conversion functions: convert a page and protection to a page entry,
332 * and a page entry and page directory to the page they refer to.
335 static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
337 pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
340 #define pmd_page_kernel(pmd) \
341 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
343 #ifndef CONFIG_DISCONTIGMEM
344 #define pmd_page(pmd) (mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
345 #endif /* !CONFIG_DISCONTIGMEM */
347 /* to find an entry in a page-table-directory. */
348 #define pgd_index(address) \
349 (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
351 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
353 /* to find an entry in a kernel page-table-directory */
354 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
356 #define pmd_index(address) \
357 (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
359 #define pte_index(address) \
360 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
361 #define pte_offset_kernel(dir, address) \
362 ((pte_t *)pmd_page_kernel(*(dir)) + pte_index(address))
363 #define pte_offset_map(dir, address) \
364 ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
365 #define pte_offset_map_nested(dir, address) pte_offset_map(dir, address)
366 #define pte_unmap(pte) do { } while (0)
367 #define pte_unmap_nested(pte) do { } while (0)
369 /* Encode and de-code a swap entry */
370 #define __swp_type(x) (((x).val >> 2) & 0x3f)
371 #define __swp_offset(x) ((x).val >> 10)
372 #define __swp_entry(type, offset) \
373 ((swp_entry_t) { ((type) << 2) | ((offset) << 10) })
374 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
375 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
377 #endif /* !__ASSEMBLY__ */
379 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
380 #define kern_addr_valid(addr) (1)
382 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
383 remap_pfn_range(vma, vaddr, pfn, size, prot)
385 #define MK_IOSPACE_PFN(space, pfn) (pfn)
386 #define GET_IOSPACE(pfn) 0
387 #define GET_PFN(pfn) (pfn)
389 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
390 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
391 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
392 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
393 #define __HAVE_ARCH_PTE_SAME
394 #include <asm-generic/pgtable.h>
396 #endif /* __KERNEL__ */
398 #endif /* _ASM_M32R_PGTABLE_H */