Linux kernel mirror (for testing)
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1#ifndef __ASM_SH_PGTABLE_H
2#define __ASM_SH_PGTABLE_H
3
4#include <asm-generic/4level-fixup.h>
5
6/*
7 * Copyright (C) 1999 Niibe Yutaka
8 * Copyright (C) 2002, 2003, 2004 Paul Mundt
9 */
10
11#include <asm/pgtable-2level.h>
12
13/*
14 * This file contains the functions and defines necessary to modify and use
15 * the SuperH page table tree.
16 */
17#ifndef __ASSEMBLY__
18#include <asm/processor.h>
19#include <asm/addrspace.h>
20#include <asm/fixmap.h>
21#include <linux/threads.h>
22
23extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
24extern void paging_init(void);
25
26/*
27 * Basically we have the same two-level (which is the logical three level
28 * Linux page table layout folded) page tables as the i386.
29 */
30
31/*
32 * ZERO_PAGE is a global shared page that is always zero: used
33 * for zero-mapped memory areas etc..
34 */
35extern unsigned long empty_zero_page[1024];
36#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
37
38#endif /* !__ASSEMBLY__ */
39
40#define PMD_SIZE (1UL << PMD_SHIFT)
41#define PMD_MASK (~(PMD_SIZE-1))
42#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
43#define PGDIR_MASK (~(PGDIR_SIZE-1))
44
45#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
46#define FIRST_USER_ADDRESS 0
47
48#define PTE_PHYS_MASK 0x1ffff000
49
50#ifndef __ASSEMBLY__
51/*
52 * First 1MB map is used by fixed purpose.
53 * Currently only 4-enty (16kB) is used (see arch/sh/mm/cache.c)
54 */
55#define VMALLOC_START (P3SEG+0x00100000)
56#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
57
58#define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */
59#define _PAGE_HW_SHARED 0x002 /* SH-bit : page is shared among processes */
60#define _PAGE_DIRTY 0x004 /* D-bit : page changed */
61#define _PAGE_CACHABLE 0x008 /* C-bit : cachable */
62#define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */
63#define _PAGE_RW 0x020 /* PR0-bit : write access allowed */
64#define _PAGE_USER 0x040 /* PR1-bit : user space access allowed */
65#define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */
66#define _PAGE_PRESENT 0x100 /* V-bit : page is valid */
67#define _PAGE_PROTNONE 0x200 /* software: if not present */
68#define _PAGE_ACCESSED 0x400 /* software: page referenced */
69#define _PAGE_U0_SHARED 0x800 /* software: page is shared in user space */
70
71#define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */
72
73/* software: moves to PTEA.TC (Timing Control) */
74#define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */
75#define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */
76
77/* software: moves to PTEA.SA[2:0] (Space Attributes) */
78#define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */
79#define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */
80#define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */
81#define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */
82#define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */
83#define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */
84#define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */
85
86
87/* Mask which drop software flags
88 * We also drop WT bit since it is used for _PAGE_FILE
89 * bit in this implementation.
90 */
91#define _PAGE_CLEAR_FLAGS (_PAGE_WT | _PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_U0_SHARED)
92
93#if defined(CONFIG_CPU_SH3)
94/*
95 * MMU on SH-3 has bug on SH-bit: We can't use it if MMUCR.IX=1.
96 * Work around: Just drop SH-bit.
97 */
98#define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS | _PAGE_HW_SHARED))
99#else
100#define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS))
101#endif
102
103/* Hardware flags: SZ0=1 (4k-byte) */
104#define _PAGE_FLAGS_HARD _PAGE_SZ0
105
106#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
107#define _PAGE_SZHUGE (_PAGE_SZ1)
108#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
109#define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1)
110#endif
111
112#define _PAGE_SHARED _PAGE_U0_SHARED
113
114#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
115#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
116#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_SHARED)
117
118#ifdef CONFIG_MMU
119#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
120#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_SHARED | _PAGE_FLAGS_HARD)
121#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
122#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
123#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
124#define PAGE_KERNEL_NOCACHE \
125 __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
126#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
127#define PAGE_KERNEL_PCC(slot, type) \
128 __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | (type))
129#else /* no mmu */
130#define PAGE_NONE __pgprot(0)
131#define PAGE_SHARED __pgprot(0)
132#define PAGE_COPY __pgprot(0)
133#define PAGE_READONLY __pgprot(0)
134#define PAGE_KERNEL __pgprot(0)
135#define PAGE_KERNEL_NOCACHE __pgprot(0)
136#define PAGE_KERNEL_RO __pgprot(0)
137#define PAGE_KERNEL_PCC __pgprot(0)
138#endif
139
140/*
141 * As i386 and MIPS, SuperH can't do page protection for execute, and
142 * considers that the same as a read. Also, write permissions imply
143 * read permissions. This is the closest we can get..
144 */
145
146#define __P000 PAGE_NONE
147#define __P001 PAGE_READONLY
148#define __P010 PAGE_COPY
149#define __P011 PAGE_COPY
150#define __P100 PAGE_READONLY
151#define __P101 PAGE_READONLY
152#define __P110 PAGE_COPY
153#define __P111 PAGE_COPY
154
155#define __S000 PAGE_NONE
156#define __S001 PAGE_READONLY
157#define __S010 PAGE_SHARED
158#define __S011 PAGE_SHARED
159#define __S100 PAGE_READONLY
160#define __S101 PAGE_READONLY
161#define __S110 PAGE_SHARED
162#define __S111 PAGE_SHARED
163
164#define pte_none(x) (!pte_val(x))
165#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
166#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
167
168#define pmd_none(x) (!pmd_val(x))
169#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
170#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
171#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
172
173#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
174#define pte_page(x) phys_to_page(pte_val(x)&PTE_PHYS_MASK)
175
176/*
177 * The following only work if pte_present() is true.
178 * Undefined behaviour if not..
179 */
180static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
181static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
182static inline int pte_dirty(pte_t pte){ return pte_val(pte) & _PAGE_DIRTY; }
183static inline int pte_young(pte_t pte){ return pte_val(pte) & _PAGE_ACCESSED; }
184static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
185static inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; }
186static inline int pte_not_present(pte_t pte){ return !(pte_val(pte) & _PAGE_PRESENT); }
187
188static inline pte_t pte_rdprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
189static inline pte_t pte_exprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
190static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
191static inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
192static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
193static inline pte_t pte_mkread(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
194static inline pte_t pte_mkexec(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
195static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
196static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
197static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
198#ifdef CONFIG_HUGETLB_PAGE
199static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; }
200#endif
201
202/*
203 * Macro and implementation to make a page protection as uncachable.
204 */
205#define pgprot_noncached pgprot_noncached
206
207static inline pgprot_t pgprot_noncached(pgprot_t _prot)
208{
209 unsigned long prot = pgprot_val(_prot);
210
211 prot &= ~_PAGE_CACHABLE;
212 return __pgprot(prot);
213}
214
215#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
216
217/*
218 * Conversion functions: convert a page and protection to a page entry,
219 * and a page entry and page directory to the page they refer to.
220 *
221 * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
222 */
223#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
224
225static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
226{ set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; }
227
228#define pmd_page_kernel(pmd) \
229((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
230
231#define pmd_page(pmd) \
232 (phys_to_page(pmd_val(pmd)))
233
234/* to find an entry in a page-table-directory. */
235#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
236#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
237
238/* to find an entry in a kernel page-table-directory */
239#define pgd_offset_k(address) pgd_offset(&init_mm, address)
240
241/* Find an entry in the third-level page table.. */
242#define pte_index(address) \
243 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
244#define pte_offset_kernel(dir, address) \
245 ((pte_t *) pmd_page_kernel(*(dir)) + pte_index(address))
246#define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
247#define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address)
248#define pte_unmap(pte) do { } while (0)
249#define pte_unmap_nested(pte) do { } while (0)
250
251struct vm_area_struct;
252extern void update_mmu_cache(struct vm_area_struct * vma,
253 unsigned long address, pte_t pte);
254
255/* Encode and de-code a swap entry */
256/*
257 * NOTE: We should set ZEROs at the position of _PAGE_PRESENT
258 * and _PAGE_PROTNONE bits
259 */
260#define __swp_type(x) ((x).val & 0xff)
261#define __swp_offset(x) ((x).val >> 10)
262#define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 10) })
263#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 })
264#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 })
265
266/*
267 * Encode and decode a nonlinear file mapping entry
268 */
269#define PTE_FILE_MAX_BITS 29
270#define pte_to_pgoff(pte) (pte_val(pte) >> 1)
271#define pgoff_to_pte(off) ((pte_t) { ((off) << 1) | _PAGE_FILE })
272
273typedef pte_t *pte_addr_t;
274
275#endif /* !__ASSEMBLY__ */
276
277#define kern_addr_valid(addr) (1)
278
279#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
280 remap_pfn_range(vma, vaddr, pfn, size, prot)
281
282#define MK_IOSPACE_PFN(space, pfn) (pfn)
283#define GET_IOSPACE(pfn) 0
284#define GET_PFN(pfn) (pfn)
285
286struct mm_struct;
287
288/*
289 * No page table caches to initialise
290 */
291#define pgtable_cache_init() do { } while (0)
292
293#ifndef CONFIG_MMU
294extern unsigned int kobjsize(const void *objp);
295#endif /* !CONFIG_MMU */
296
297#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)
298#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
299extern pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
300#endif
301
302#include <asm-generic/pgtable.h>
303
304#endif /* __ASM_SH_PAGE_H */
305