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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#include <asm/mmu.h>
22
23#ifndef __ASSEMBLY__
24#include <asm/addrspace.h>
25#include <asm/fixmap.h>
26
27/*
28 * ZERO_PAGE is a global shared page that is always zero: used
29 * for zero-mapped memory areas etc..
30 */
31extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
32#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
33
34#endif /* !__ASSEMBLY__ */
35
36/*
37 * Effective and physical address definitions, to aid with sign
38 * extension.
39 */
40#define NEFF 32
41#define NEFF_SIGN (1LL << (NEFF - 1))
42#define NEFF_MASK (-1LL << NEFF)
43
44static inline unsigned long long neff_sign_extend(unsigned long val)
45{
46 unsigned long long extended = val;
47 return (extended & NEFF_SIGN) ? (extended | NEFF_MASK) : extended;
48}
49
50#ifdef CONFIG_29BIT
51#define NPHYS 29
52#else
53#define NPHYS 32
54#endif
55
56#define NPHYS_SIGN (1LL << (NPHYS - 1))
57#define NPHYS_MASK (-1LL << NPHYS)
58
59#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
60#define PGDIR_MASK (~(PGDIR_SIZE-1))
61
62/* Entries per level */
63#define PTRS_PER_PTE (PAGE_SIZE / (1 << PTE_MAGNITUDE))
64
65#define FIRST_USER_ADDRESS 0
66
67#define PHYS_ADDR_MASK29 0x1fffffff
68#define PHYS_ADDR_MASK32 0xffffffff
69
70static inline unsigned long phys_addr_mask(void)
71{
72 /* Is the MMU in 29bit mode? */
73 if (__in_29bit_mode())
74 return PHYS_ADDR_MASK29;
75
76 return PHYS_ADDR_MASK32;
77}
78
79#define PTE_PHYS_MASK (phys_addr_mask() & PAGE_MASK)
80#define PTE_FLAGS_MASK (~(PTE_PHYS_MASK) << PAGE_SHIFT)
81
82#ifdef CONFIG_SUPERH32
83#define VMALLOC_START (P3SEG)
84#else
85#define VMALLOC_START (0xf0000000)
86#endif
87#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
88
89#if defined(CONFIG_SUPERH32)
90#include <asm/pgtable_32.h>
91#else
92#include <asm/pgtable_64.h>
93#endif
94
95/*
96 * SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page
97 * protection for execute, and considers it the same as a read. Also, write
98 * permission implies read permission. This is the closest we can get..
99 *
100 * SH-X2 (SH7785) and later parts take this to the opposite end of the extreme,
101 * not only supporting separate execute, read, and write bits, but having
102 * completely separate permission bits for user and kernel space.
103 */
104 /*xwr*/
105#define __P000 PAGE_NONE
106#define __P001 PAGE_READONLY
107#define __P010 PAGE_COPY
108#define __P011 PAGE_COPY
109#define __P100 PAGE_EXECREAD
110#define __P101 PAGE_EXECREAD
111#define __P110 PAGE_COPY
112#define __P111 PAGE_COPY
113
114#define __S000 PAGE_NONE
115#define __S001 PAGE_READONLY
116#define __S010 PAGE_WRITEONLY
117#define __S011 PAGE_SHARED
118#define __S100 PAGE_EXECREAD
119#define __S101 PAGE_EXECREAD
120#define __S110 PAGE_RWX
121#define __S111 PAGE_RWX
122
123typedef pte_t *pte_addr_t;
124
125#define kern_addr_valid(addr) (1)
126
127#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
128 remap_pfn_range(vma, vaddr, pfn, size, prot)
129
130#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
131
132/*
133 * Initialise the page table caches
134 */
135extern void pgtable_cache_init(void);
136
137struct vm_area_struct;
138struct mm_struct;
139
140extern void __update_cache(struct vm_area_struct *vma,
141 unsigned long address, pte_t pte);
142extern void __update_tlb(struct vm_area_struct *vma,
143 unsigned long address, pte_t pte);
144
145static inline void
146update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
147{
148 pte_t pte = *ptep;
149 __update_cache(vma, address, pte);
150 __update_tlb(vma, address, pte);
151}
152
153extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
154extern void paging_init(void);
155extern void page_table_range_init(unsigned long start, unsigned long end,
156 pgd_t *pgd);
157
158/* arch/sh/mm/mmap.c */
159#define HAVE_ARCH_UNMAPPED_AREA
160#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
161
162#define __HAVE_ARCH_PTE_SPECIAL
163
164#include <asm-generic/pgtable.h>
165
166#endif /* __ASM_SH_PGTABLE_H */
1/* SPDX-License-Identifier: GPL-2.0
2 *
3 * This file contains the functions and defines necessary to modify and
4 * use the SuperH page table tree.
5 *
6 * Copyright (C) 1999 Niibe Yutaka
7 * Copyright (C) 2002 - 2007 Paul Mundt
8 */
9#ifndef __ASM_SH_PGTABLE_H
10#define __ASM_SH_PGTABLE_H
11
12#ifdef CONFIG_X2TLB
13#include <asm/pgtable-3level.h>
14#else
15#include <asm/pgtable-2level.h>
16#endif
17#include <asm/page.h>
18#include <asm/mmu.h>
19
20#ifndef __ASSEMBLY__
21#include <asm/addrspace.h>
22#include <asm/fixmap.h>
23
24/*
25 * ZERO_PAGE is a global shared page that is always zero: used
26 * for zero-mapped memory areas etc..
27 */
28extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
29#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
30
31#endif /* !__ASSEMBLY__ */
32
33/*
34 * Effective and physical address definitions, to aid with sign
35 * extension.
36 */
37#define NEFF 32
38#define NEFF_SIGN (1LL << (NEFF - 1))
39#define NEFF_MASK (-1LL << NEFF)
40
41static inline unsigned long long neff_sign_extend(unsigned long val)
42{
43 unsigned long long extended = val;
44 return (extended & NEFF_SIGN) ? (extended | NEFF_MASK) : extended;
45}
46
47#ifdef CONFIG_29BIT
48#define NPHYS 29
49#else
50#define NPHYS 32
51#endif
52
53#define NPHYS_SIGN (1LL << (NPHYS - 1))
54#define NPHYS_MASK (-1LL << NPHYS)
55
56#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
57#define PGDIR_MASK (~(PGDIR_SIZE-1))
58
59/* Entries per level */
60#define PTRS_PER_PTE (PAGE_SIZE / (1 << PTE_MAGNITUDE))
61
62#define PHYS_ADDR_MASK29 0x1fffffff
63#define PHYS_ADDR_MASK32 0xffffffff
64
65static inline unsigned long phys_addr_mask(void)
66{
67 /* Is the MMU in 29bit mode? */
68 if (__in_29bit_mode())
69 return PHYS_ADDR_MASK29;
70
71 return PHYS_ADDR_MASK32;
72}
73
74#define PTE_PHYS_MASK (phys_addr_mask() & PAGE_MASK)
75#define PTE_FLAGS_MASK (~(PTE_PHYS_MASK) << PAGE_SHIFT)
76
77#define VMALLOC_START (P3SEG)
78#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
79
80#include <asm/pgtable_32.h>
81
82/*
83 * SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page
84 * protection for execute, and considers it the same as a read. Also, write
85 * permission implies read permission. This is the closest we can get..
86 *
87 * SH-X2 (SH7785) and later parts take this to the opposite end of the extreme,
88 * not only supporting separate execute, read, and write bits, but having
89 * completely separate permission bits for user and kernel space.
90 */
91 /*xwr*/
92#define __P000 PAGE_NONE
93#define __P001 PAGE_READONLY
94#define __P010 PAGE_COPY
95#define __P011 PAGE_COPY
96#define __P100 PAGE_EXECREAD
97#define __P101 PAGE_EXECREAD
98#define __P110 PAGE_COPY
99#define __P111 PAGE_COPY
100
101#define __S000 PAGE_NONE
102#define __S001 PAGE_READONLY
103#define __S010 PAGE_WRITEONLY
104#define __S011 PAGE_SHARED
105#define __S100 PAGE_EXECREAD
106#define __S101 PAGE_EXECREAD
107#define __S110 PAGE_RWX
108#define __S111 PAGE_RWX
109
110typedef pte_t *pte_addr_t;
111
112#define kern_addr_valid(addr) (1)
113
114#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
115
116struct vm_area_struct;
117struct mm_struct;
118
119extern void __update_cache(struct vm_area_struct *vma,
120 unsigned long address, pte_t pte);
121extern void __update_tlb(struct vm_area_struct *vma,
122 unsigned long address, pte_t pte);
123
124static inline void
125update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
126{
127 pte_t pte = *ptep;
128 __update_cache(vma, address, pte);
129 __update_tlb(vma, address, pte);
130}
131
132extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
133extern void paging_init(void);
134extern void page_table_range_init(unsigned long start, unsigned long end,
135 pgd_t *pgd);
136
137static inline bool __pte_access_permitted(pte_t pte, u64 prot)
138{
139 return (pte_val(pte) & (prot | _PAGE_SPECIAL)) == prot;
140}
141
142#ifdef CONFIG_X2TLB
143static inline bool pte_access_permitted(pte_t pte, bool write)
144{
145 u64 prot = _PAGE_PRESENT;
146
147 prot |= _PAGE_EXT(_PAGE_EXT_KERN_READ | _PAGE_EXT_USER_READ);
148 if (write)
149 prot |= _PAGE_EXT(_PAGE_EXT_KERN_WRITE | _PAGE_EXT_USER_WRITE);
150 return __pte_access_permitted(pte, prot);
151}
152#else
153static inline bool pte_access_permitted(pte_t pte, bool write)
154{
155 u64 prot = _PAGE_PRESENT | _PAGE_USER;
156
157 if (write)
158 prot |= _PAGE_RW;
159 return __pte_access_permitted(pte, prot);
160}
161#endif
162
163#define pte_access_permitted pte_access_permitted
164
165/* arch/sh/mm/mmap.c */
166#define HAVE_ARCH_UNMAPPED_AREA
167#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
168
169#endif /* __ASM_SH_PGTABLE_H */