1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/* SPDX-License-Identifier: GPL-2.0
*
* This file contains the functions and defines necessary to modify and
* use the SuperH page table tree.
*
* Copyright (C) 1999 Niibe Yutaka
* Copyright (C) 2002 - 2007 Paul Mundt
*/
#ifndef __ASM_SH_PGTABLE_H
#define __ASM_SH_PGTABLE_H
#ifdef CONFIG_X2TLB
#include <asm/pgtable-3level.h>
#else
#include <asm/pgtable-2level.h>
#endif
#include <asm/page.h>
#include <asm/mmu.h>
#ifndef __ASSEMBLY__
#include <asm/addrspace.h>
#include <asm/fixmap.h>
/*
* ZERO_PAGE is a global shared page that is always zero: used
* for zero-mapped memory areas etc..
*/
extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
#endif /* !__ASSEMBLY__ */
/*
* Effective and physical address definitions, to aid with sign
* extension.
*/
#define NEFF 32
#define NEFF_SIGN (1LL << (NEFF - 1))
#define NEFF_MASK (-1LL << NEFF)
static inline unsigned long long neff_sign_extend(unsigned long val)
{
unsigned long long extended = val;
return (extended & NEFF_SIGN) ? (extended | NEFF_MASK) : extended;
}
#ifdef CONFIG_29BIT
#define NPHYS 29
#else
#define NPHYS 32
#endif
#define NPHYS_SIGN (1LL << (NPHYS - 1))
#define NPHYS_MASK (-1LL << NPHYS)
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
/* Entries per level */
#define PTRS_PER_PTE (PAGE_SIZE / (1 << PTE_MAGNITUDE))
#define FIRST_USER_ADDRESS 0UL
#define PHYS_ADDR_MASK29 0x1fffffff
#define PHYS_ADDR_MASK32 0xffffffff
static inline unsigned long phys_addr_mask(void)
{
/* Is the MMU in 29bit mode? */
if (__in_29bit_mode())
return PHYS_ADDR_MASK29;
return PHYS_ADDR_MASK32;
}
#define PTE_PHYS_MASK (phys_addr_mask() & PAGE_MASK)
#define PTE_FLAGS_MASK (~(PTE_PHYS_MASK) << PAGE_SHIFT)
#ifdef CONFIG_SUPERH32
#define VMALLOC_START (P3SEG)
#else
#define VMALLOC_START (0xf0000000)
#endif
#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
#if defined(CONFIG_SUPERH32)
#include <asm/pgtable_32.h>
#else
#include <asm/pgtable_64.h>
#endif
/*
* SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page
* protection for execute, and considers it the same as a read. Also, write
* permission implies read permission. This is the closest we can get..
*
* SH-X2 (SH7785) and later parts take this to the opposite end of the extreme,
* not only supporting separate execute, read, and write bits, but having
* completely separate permission bits for user and kernel space.
*/
/*xwr*/
#define __P000 PAGE_NONE
#define __P001 PAGE_READONLY
#define __P010 PAGE_COPY
#define __P011 PAGE_COPY
#define __P100 PAGE_EXECREAD
#define __P101 PAGE_EXECREAD
#define __P110 PAGE_COPY
#define __P111 PAGE_COPY
#define __S000 PAGE_NONE
#define __S001 PAGE_READONLY
#define __S010 PAGE_WRITEONLY
#define __S011 PAGE_SHARED
#define __S100 PAGE_EXECREAD
#define __S101 PAGE_EXECREAD
#define __S110 PAGE_RWX
#define __S111 PAGE_RWX
typedef pte_t *pte_addr_t;
#define kern_addr_valid(addr) (1)
#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
/*
* Initialise the page table caches
*/
extern void pgtable_cache_init(void);
struct vm_area_struct;
struct mm_struct;
extern void __update_cache(struct vm_area_struct *vma,
unsigned long address, pte_t pte);
extern void __update_tlb(struct vm_area_struct *vma,
unsigned long address, pte_t pte);
static inline void
update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
{
pte_t pte = *ptep;
__update_cache(vma, address, pte);
__update_tlb(vma, address, pte);
}
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern void paging_init(void);
extern void page_table_range_init(unsigned long start, unsigned long end,
pgd_t *pgd);
/* arch/sh/mm/mmap.c */
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
#include <asm-generic/pgtable.h>
#endif /* __ASM_SH_PGTABLE_H */
|
