1 #ifndef __ASM_SH_PGTABLE_H
2 #define __ASM_SH_PGTABLE_H
5 * Copyright (C) 1999 Niibe Yutaka
6 * Copyright (C) 2002, 2003 Paul Mundt
9 #include <linux/config.h>
10 #include <asm/pgtable-2level.h>
13 * This file contains the functions and defines necessary to modify and use
14 * the SuperH page table tree.
17 #include <asm/processor.h>
18 #include <asm/addrspace.h>
19 #include <linux/threads.h>
21 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
22 extern void paging_init(void);
25 * Basically we have the same two-level (which is the logical three level
26 * Linux page table layout folded) page tables as the i386.
30 * ZERO_PAGE is a global shared page that is always zero: used
31 * for zero-mapped memory areas etc..
33 extern unsigned long empty_zero_page[1024];
34 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
36 #endif /* !__ASSEMBLY__ */
38 #define PMD_SIZE (1UL << PMD_SHIFT)
39 #define PMD_MASK (~(PMD_SIZE-1))
40 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
41 #define PGDIR_MASK (~(PGDIR_SIZE-1))
43 #define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
44 #define FIRST_USER_PGD_NR 0
46 #define PTE_PHYS_MASK 0x1ffff000
50 * First 1MB map is used by fixed purpose.
51 * Currently only 4-enty (16kB) is used (see arch/sh/mm/cache.c)
53 #define VMALLOC_START (P3SEG+0x00100000)
54 #define VMALLOC_END P4SEG
56 #define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */
57 #define _PAGE_HW_SHARED 0x002 /* SH-bit : page is shared among processes */
58 #define _PAGE_DIRTY 0x004 /* D-bit : page changed */
59 #define _PAGE_CACHABLE 0x008 /* C-bit : cachable */
60 #define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */
61 #define _PAGE_RW 0x020 /* PR0-bit : write access allowed */
62 #define _PAGE_USER 0x040 /* PR1-bit : user space access allowed */
63 #define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */
64 #define _PAGE_PRESENT 0x100 /* V-bit : page is valid */
65 #define _PAGE_PROTNONE 0x200 /* software: if not present */
66 #define _PAGE_ACCESSED 0x400 /* software: page referenced */
67 #define _PAGE_U0_SHARED 0x800 /* software: page is shared in user space */
69 #define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */
71 /* software: moves to PTEA.TC (Timing Control) */
72 #define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */
73 #define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */
75 /* software: moves to PTEA.SA[2:0] (Space Attributes) */
76 #define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */
77 #define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */
78 #define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */
79 #define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */
80 #define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */
81 #define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */
82 #define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */
85 /* Mask which drop software flags
86 * We also drop WT bit since it is used for _PAGE_FILE
87 * bit in this implementation.
89 #define _PAGE_CLEAR_FLAGS (_PAGE_WT | _PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_U0_SHARED)
91 #if defined(CONFIG_CPU_SH3)
93 * MMU on SH-3 has bug on SH-bit: We can't use it if MMUCR.IX=1.
94 * Work around: Just drop SH-bit.
96 #define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS | _PAGE_HW_SHARED))
98 #define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS))
101 /* Hardware flags: SZ0=1 (4k-byte) */
102 #define _PAGE_FLAGS_HARD _PAGE_SZ0
104 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
105 #define _PAGE_SZHUGE (_PAGE_SZ1)
106 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
107 #define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1)
110 #define _PAGE_SHARED _PAGE_U0_SHARED
112 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
113 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
114 #define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_SHARED)
117 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
118 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_SHARED | _PAGE_FLAGS_HARD)
119 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
120 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
121 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
122 #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
123 #define PAGE_KERNEL_PCC(slot, type) \
124 __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | (type))
126 #define PAGE_NONE __pgprot(0)
127 #define PAGE_SHARED __pgprot(0)
128 #define PAGE_COPY __pgprot(0)
129 #define PAGE_READONLY __pgprot(0)
130 #define PAGE_KERNEL __pgprot(0)
131 #define PAGE_KERNEL_RO __pgprot(0)
132 #define PAGE_KERNEL_PCC __pgprot(0)
136 * As i386 and MIPS, SuperH can't do page protection for execute, and
137 * considers that the same as a read. Also, write permissions imply
138 * read permissions. This is the closest we can get..
141 #define __P000 PAGE_NONE
142 #define __P001 PAGE_READONLY
143 #define __P010 PAGE_COPY
144 #define __P011 PAGE_COPY
145 #define __P100 PAGE_READONLY
146 #define __P101 PAGE_READONLY
147 #define __P110 PAGE_COPY
148 #define __P111 PAGE_COPY
150 #define __S000 PAGE_NONE
151 #define __S001 PAGE_READONLY
152 #define __S010 PAGE_SHARED
153 #define __S011 PAGE_SHARED
154 #define __S100 PAGE_READONLY
155 #define __S101 PAGE_READONLY
156 #define __S110 PAGE_SHARED
157 #define __S111 PAGE_SHARED
159 #define pte_none(x) (!pte_val(x))
160 #define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
161 #define pte_clear(xp) do { set_pte(xp, __pte(0)); } while (0)
163 #define pmd_none(x) (!pmd_val(x))
164 #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
165 #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
166 #define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
168 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
169 #define pte_page(x) phys_to_page(pte_val(x)&PTE_PHYS_MASK)
172 * The following only work if pte_present() is true.
173 * Undefined behaviour if not..
175 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
176 static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
177 static inline int pte_dirty(pte_t pte){ return pte_val(pte) & _PAGE_DIRTY; }
178 static inline int pte_young(pte_t pte){ return pte_val(pte) & _PAGE_ACCESSED; }
179 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
180 static inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; }
181 static inline int pte_not_present(pte_t pte){ return !(pte_val(pte) & _PAGE_PRESENT); }
183 static inline pte_t pte_rdprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
184 static inline pte_t pte_exprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
185 static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
186 static inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
187 static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
188 static inline pte_t pte_mkread(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
189 static inline pte_t pte_mkexec(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
190 static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
191 static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
192 static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
195 * Macro and implementation to make a page protection as uncachable.
197 #define pgprot_noncached pgprot_noncached
199 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
201 unsigned long prot = pgprot_val(_prot);
203 prot &= ~_PAGE_CACHABLE;
204 return __pgprot(prot);
207 #define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
210 * Conversion functions: convert a page and protection to a page entry,
211 * and a page entry and page directory to the page they refer to.
213 * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
215 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
217 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
218 { set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; }
220 #define page_pte(page) page_pte_prot(page, __pgprot(0))
222 #define pmd_page_kernel(pmd) \
223 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
225 #define pmd_page(pmd) \
226 (phys_to_page(pmd_val(pmd)))
228 /* to find an entry in a page-table-directory. */
229 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
230 #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
232 /* to find an entry in a kernel page-table-directory */
233 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
235 /* Find an entry in the third-level page table.. */
236 #define pte_index(address) \
237 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
238 #define pte_offset_kernel(dir, address) \
239 ((pte_t *) pmd_page_kernel(*(dir)) + pte_index(address))
240 #define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
241 #define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address)
242 #define pte_unmap(pte) do { } while (0)
243 #define pte_unmap_nested(pte) do { } while (0)
245 struct vm_area_struct;
246 extern void update_mmu_cache(struct vm_area_struct * vma,
247 unsigned long address, pte_t pte);
249 /* Encode and de-code a swap entry */
251 * NOTE: We should set ZEROs at the position of _PAGE_PRESENT
252 * and _PAGE_PROTNONE bits
254 #define __swp_type(x) ((x).val & 0xff)
255 #define __swp_offset(x) ((x).val >> 10)
256 #define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 10) })
257 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
258 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
261 * Encode and decode a nonlinear file mapping entry
263 #define PTE_FILE_MAX_BITS 29
264 #define pte_to_pgoff(pte) (pte_val(pte))
265 #define pgoff_to_pte(off) ((pte_t) { (off) | _PAGE_FILE })
268 * Routines for update of PTE
270 * We just can use generic implementation, as SuperH has no SMP feature.
271 * (We needed atomic implementation for SMP)
275 #define pte_same(A,B) (pte_val(A) == pte_val(B))
277 typedef pte_t *pte_addr_t;
279 #endif /* !__ASSEMBLY__ */
281 #define kern_addr_valid(addr) (1)
283 #define io_remap_page_range remap_page_range
286 * No page table caches to initialise
288 #define pgtable_cache_init() do { } while (0)
291 extern unsigned int kobjsize(const void *objp);
292 #endif /* !CONFIG_MMU */
294 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
295 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
296 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
297 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
298 #define __HAVE_ARCH_PTEP_MKDIRTY
299 #define __HAVE_ARCH_PTE_SAME
300 #include <asm-generic/pgtable.h>
302 #endif /* __ASM_SH_PAGE_H */