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 */
28 extern 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
41 static 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
65 static 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
93 typedef pte_t *pte_addr_t;
94
95 #define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
96
97 struct vm_area_struct;
98 struct mm_struct;
99
100 extern void __update_cache(struct vm_area_struct *vma,
101 unsigned long address, pte_t pte);
102 extern void __update_tlb(struct vm_area_struct *vma,
103 unsigned long address, pte_t pte);
104
105 static inline void update_mmu_cache_range(struct vm_fault *vmf,
106 struct vm_area_struct *vma, unsigned long address,
107 pte_t *ptep, unsigned int nr)
108 {
109 pte_t pte = *ptep;
110 __update_cache(vma, address, pte);
111 __update_tlb(vma, address, pte);
112 }
113 #define update_mmu_cache(vma, addr, ptep) \
114 update_mmu_cache_range(NULL, vma, addr, ptep, 1)
115
116 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
117 extern void paging_init(void);
118 extern void page_table_range_init(unsigned long start, unsigned long end,
119 pgd_t *pgd);
120
121 static inline bool __pte_access_permitted(pte_t pte, u64 prot)
122 {
123 return (pte_val(pte) & (prot | _PAGE_SPECIAL)) == prot;
124 }
125
126 #ifdef CONFIG_X2TLB
127 static inline bool pte_access_permitted(pte_t pte, bool write)
128 {
129 u64 prot = _PAGE_PRESENT;
130
131 prot |= _PAGE_EXT(_PAGE_EXT_KERN_READ | _PAGE_EXT_USER_READ);
132 if (write)
133 prot |= _PAGE_EXT(_PAGE_EXT_KERN_WRITE | _PAGE_EXT_USER_WRITE);
134 return __pte_access_permitted(pte, prot);
135 }
136 #else
137 static inline bool pte_access_permitted(pte_t pte, bool write)
138 {
139 u64 prot = _PAGE_PRESENT | _PAGE_USER;
140
141 if (write)
142 prot |= _PAGE_RW;
143 return __pte_access_permitted(pte, prot);
144 }
145 #endif
146
147 #define pte_access_permitted pte_access_permitted
148
149 /* arch/sh/mm/mmap.c */
150 #define HAVE_ARCH_UNMAPPED_AREA
151 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
152
153 #endif /* __ASM_SH_PGTABLE_H */
154
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