Linux kernel mirror (for testing)
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1/*
2 * This file contains the functions and defines necessary to modify and
3 * use the SuperH page table tree.
4 *
5 * Copyright (C) 1999 Niibe Yutaka
6 * Copyright (C) 2002 - 2007 Paul Mundt
7 *
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file "COPYING" in the main directory of this
10 * archive for more details.
11 */
12#ifndef __ASM_SH_PGTABLE_H
13#define __ASM_SH_PGTABLE_H
14
15#ifdef CONFIG_X2TLB
16#include <asm/pgtable-3level.h>
17#else
18#include <asm/pgtable-2level.h>
19#endif
20#include <asm/page.h>
21
22#ifndef __ASSEMBLY__
23#include <asm/addrspace.h>
24#include <asm/fixmap.h>
25
26/*
27 * ZERO_PAGE is a global shared page that is always zero: used
28 * for zero-mapped memory areas etc..
29 */
30extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
31#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
32
33#endif /* !__ASSEMBLY__ */
34
35/*
36 * Effective and physical address definitions, to aid with sign
37 * extension.
38 */
39#define NEFF 32
40#define NEFF_SIGN (1LL << (NEFF - 1))
41#define NEFF_MASK (-1LL << NEFF)
42
43static inline unsigned long long neff_sign_extend(unsigned long val)
44{
45 unsigned long long extended = val;
46 return (extended & NEFF_SIGN) ? (extended | NEFF_MASK) : extended;
47}
48
49#ifdef CONFIG_29BIT
50#define NPHYS 29
51#else
52#define NPHYS 32
53#endif
54
55#define NPHYS_SIGN (1LL << (NPHYS - 1))
56#define NPHYS_MASK (-1LL << NPHYS)
57
58#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
59#define PGDIR_MASK (~(PGDIR_SIZE-1))
60
61/* Entries per level */
62#define PTRS_PER_PTE (PAGE_SIZE / (1 << PTE_MAGNITUDE))
63
64#define FIRST_USER_ADDRESS 0
65
66#define PHYS_ADDR_MASK29 0x1fffffff
67#define PHYS_ADDR_MASK32 0xffffffff
68
69static inline unsigned long phys_addr_mask(void)
70{
71 /* Is the MMU in 29bit mode? */
72 if (__in_29bit_mode())
73 return PHYS_ADDR_MASK29;
74
75 return PHYS_ADDR_MASK32;
76}
77
78#define PTE_PHYS_MASK (phys_addr_mask() & PAGE_MASK)
79#define PTE_FLAGS_MASK (~(PTE_PHYS_MASK) << PAGE_SHIFT)
80
81#ifdef CONFIG_SUPERH32
82#define VMALLOC_START (P3SEG)
83#else
84#define VMALLOC_START (0xf0000000)
85#endif
86#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
87
88#if defined(CONFIG_SUPERH32)
89#include <asm/pgtable_32.h>
90#else
91#include <asm/pgtable_64.h>
92#endif
93
94/*
95 * SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page
96 * protection for execute, and considers it the same as a read. Also, write
97 * permission implies read permission. This is the closest we can get..
98 *
99 * SH-X2 (SH7785) and later parts take this to the opposite end of the extreme,
100 * not only supporting separate execute, read, and write bits, but having
101 * completely separate permission bits for user and kernel space.
102 */
103 /*xwr*/
104#define __P000 PAGE_NONE
105#define __P001 PAGE_READONLY
106#define __P010 PAGE_COPY
107#define __P011 PAGE_COPY
108#define __P100 PAGE_EXECREAD
109#define __P101 PAGE_EXECREAD
110#define __P110 PAGE_COPY
111#define __P111 PAGE_COPY
112
113#define __S000 PAGE_NONE
114#define __S001 PAGE_READONLY
115#define __S010 PAGE_WRITEONLY
116#define __S011 PAGE_SHARED
117#define __S100 PAGE_EXECREAD
118#define __S101 PAGE_EXECREAD
119#define __S110 PAGE_RWX
120#define __S111 PAGE_RWX
121
122typedef pte_t *pte_addr_t;
123
124#define kern_addr_valid(addr) (1)
125
126#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
127 remap_pfn_range(vma, vaddr, pfn, size, prot)
128
129#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
130
131/*
132 * Initialise the page table caches
133 */
134extern void pgtable_cache_init(void);
135
136struct vm_area_struct;
137struct mm_struct;
138
139extern void __update_cache(struct vm_area_struct *vma,
140 unsigned long address, pte_t pte);
141extern void __update_tlb(struct vm_area_struct *vma,
142 unsigned long address, pte_t pte);
143
144static inline void
145update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
146{
147 pte_t pte = *ptep;
148 __update_cache(vma, address, pte);
149 __update_tlb(vma, address, pte);
150}
151
152extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
153extern void paging_init(void);
154extern void page_table_range_init(unsigned long start, unsigned long end,
155 pgd_t *pgd);
156
157/* arch/sh/mm/mmap.c */
158#define HAVE_ARCH_UNMAPPED_AREA
159#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
160
161#define __HAVE_ARCH_PTE_SPECIAL
162
163#include <asm-generic/pgtable.h>
164
165#endif /* __ASM_SH_PGTABLE_H */