1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2020 Loongson Technology Corporation Limited
4 */
5 #ifndef _ASM_PGTABLE_64_H
6 #define _ASM_PGTABLE_64_H
7
8 #include <linux/compiler.h>
9 #include <linux/linkage.h>
10
11 #include <asm/addrspace.h>
12
13 #if CONFIG_PGTABLE_LEVELS == 2
14 #include <asm-generic/pgtable-nopmd.h>
15 #elif CONFIG_PGTABLE_LEVELS == 3
16 #include <asm-generic/pgtable-nopud.h>
17 #else
18 #include <asm-generic/pgtable-nop4d.h>
19 #endif
20
21 #define PGD_ORDER 0
22 #define PUD_ORDER 0
23 #define PMD_ORDER 0
24 #define PTE_ORDER 0
25
26 #if CONFIG_PGTABLE_LEVELS == 2
27 #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3))
28 #elif CONFIG_PGTABLE_LEVELS == 3
29 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3))
30 #define PMD_SIZE (1UL << PMD_SHIFT)
31 #define PMD_MASK (~(PMD_SIZE-1))
32 #define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3))
33 #elif CONFIG_PGTABLE_LEVELS == 4
34 #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3))
35 #define PMD_SIZE (1UL << PMD_SHIFT)
36 #define PMD_MASK (~(PMD_SIZE-1))
37 #define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3))
38 #define PUD_SIZE (1UL << PUD_SHIFT)
39 #define PUD_MASK (~(PUD_SIZE-1))
40 #define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT + PUD_ORDER - 3))
41 #endif
42
43 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
44 #define PGDIR_MASK (~(PGDIR_SIZE-1))
45
46 #define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT + PGD_ORDER - 3))
47
48 #define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) >> 3)
49 #if CONFIG_PGTABLE_LEVELS > 3
50 #define PTRS_PER_PUD ((PAGE_SIZE << PUD_ORDER) >> 3)
51 #endif
52 #if CONFIG_PGTABLE_LEVELS > 2
53 #define PTRS_PER_PMD ((PAGE_SIZE << PMD_ORDER) >> 3)
54 #endif
55 #define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) >> 3)
56
57 #define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
58 #define FIRST_USER_ADDRESS 0UL
59
60 #ifndef __ASSEMBLY__
61
62 #include <asm/fixmap.h>
63 #include <asm/sparsemem.h>
64
65 /*
66 * TLB refill handlers may also map the vmalloc area into xkvrange.
67 * Avoid the first couple of pages so NULL pointer dereferences will
68 * still reliably trap.
69 */
70 #define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
71 #define MODULES_END (MODULES_VADDR + SZ_256M)
72
73 #define VMALLOC_START MODULES_END
74
75 #ifndef CONFIG_KASAN
76 #define VMALLOC_END \
77 (vm_map_base + \
78 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE - VMEMMAP_SIZE)
79 #else
80 #define VMALLOC_END \
81 (vm_map_base + \
82 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits) / 2) - PMD_SIZE - VMEMMAP_SIZE)
83 #endif
84
85 #define vmemmap ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK))
86 #define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1)
87
88 #define pte_ERROR(e) \
89 printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
90 #ifndef __PAGETABLE_PMD_FOLDED
91 #define pmd_ERROR(e) \
92 printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
93 #endif
94 #ifndef __PAGETABLE_PUD_FOLDED
95 #define pud_ERROR(e) \
96 printk("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
97 #endif
98 #define pgd_ERROR(e) \
99 printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
100
101 extern pte_t invalid_pte_table[PTRS_PER_PTE];
102
103 #ifndef __PAGETABLE_PUD_FOLDED
104
105 typedef struct { unsigned long pud; } pud_t;
106 #define pud_val(x) ((x).pud)
107 #define __pud(x) ((pud_t) { (x) })
108
109 extern pud_t invalid_pud_table[PTRS_PER_PUD];
110
111 /*
112 * Empty pgd/p4d entries point to the invalid_pud_table.
113 */
p4d_none(p4d_t p4d)114 static inline int p4d_none(p4d_t p4d)
115 {
116 return p4d_val(p4d) == (unsigned long)invalid_pud_table;
117 }
118
p4d_bad(p4d_t p4d)119 static inline int p4d_bad(p4d_t p4d)
120 {
121 return p4d_val(p4d) & ~PAGE_MASK;
122 }
123
p4d_present(p4d_t p4d)124 static inline int p4d_present(p4d_t p4d)
125 {
126 return p4d_val(p4d) != (unsigned long)invalid_pud_table;
127 }
128
p4d_clear(p4d_t *p4dp)129 static inline void p4d_clear(p4d_t *p4dp)
130 {
131 p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
132 }
133
p4d_pgtable(p4d_t p4d)134 static inline pud_t *p4d_pgtable(p4d_t p4d)
135 {
136 return (pud_t *)p4d_val(p4d);
137 }
138
set_p4d(p4d_t *p4d, p4d_t p4dval)139 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
140 {
141 *p4d = p4dval;
142 }
143
144 #define p4d_phys(p4d) PHYSADDR(p4d_val(p4d))
145 #define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
146
147 #endif
148
149 #ifndef __PAGETABLE_PMD_FOLDED
150
151 typedef struct { unsigned long pmd; } pmd_t;
152 #define pmd_val(x) ((x).pmd)
153 #define __pmd(x) ((pmd_t) { (x) } )
154
155 extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
156
157 /*
158 * Empty pud entries point to the invalid_pmd_table.
159 */
pud_none(pud_t pud)160 static inline int pud_none(pud_t pud)
161 {
162 return pud_val(pud) == (unsigned long)invalid_pmd_table;
163 }
164
pud_bad(pud_t pud)165 static inline int pud_bad(pud_t pud)
166 {
167 return pud_val(pud) & ~PAGE_MASK;
168 }
169
pud_present(pud_t pud)170 static inline int pud_present(pud_t pud)
171 {
172 return pud_val(pud) != (unsigned long)invalid_pmd_table;
173 }
174
pud_clear(pud_t *pudp)175 static inline void pud_clear(pud_t *pudp)
176 {
177 pud_val(*pudp) = ((unsigned long)invalid_pmd_table);
178 }
179
pud_pgtable(pud_t pud)180 static inline pmd_t *pud_pgtable(pud_t pud)
181 {
182 return (pmd_t *)pud_val(pud);
183 }
184
185 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while (0)
186
187 #define pud_phys(pud) PHYSADDR(pud_val(pud))
188 #define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
189
190 #endif
191
192 /*
193 * Empty pmd entries point to the invalid_pte_table.
194 */
pmd_none(pmd_t pmd)195 static inline int pmd_none(pmd_t pmd)
196 {
197 return pmd_val(pmd) == (unsigned long)invalid_pte_table;
198 }
199
pmd_bad(pmd_t pmd)200 static inline int pmd_bad(pmd_t pmd)
201 {
202 return (pmd_val(pmd) & ~PAGE_MASK);
203 }
204
pmd_present(pmd_t pmd)205 static inline int pmd_present(pmd_t pmd)
206 {
207 if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
208 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID));
209
210 return pmd_val(pmd) != (unsigned long)invalid_pte_table;
211 }
212
pmd_clear(pmd_t *pmdp)213 static inline void pmd_clear(pmd_t *pmdp)
214 {
215 pmd_val(*pmdp) = ((unsigned long)invalid_pte_table);
216 }
217
218 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while (0)
219
220 #define pmd_phys(pmd) PHYSADDR(pmd_val(pmd))
221
222 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
223 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
224 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
225
226 #define pmd_page_vaddr(pmd) pmd_val(pmd)
227
228 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
229 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd);
230
231 #define pte_page(x) pfn_to_page(pte_pfn(x))
232 #define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> _PFN_SHIFT))
233 #define pfn_pte(pfn, prot) __pte(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
234 #define pfn_pmd(pfn, prot) __pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
235
236 /*
237 * Initialize a new pgd / pmd table with invalid pointers.
238 */
239 extern void pgd_init(unsigned long page);
240 extern void pud_init(unsigned long page, unsigned long pagetable);
241 extern void pmd_init(unsigned long page, unsigned long pagetable);
242
243 /*
244 * Non-present pages: high 40 bits are offset, next 8 bits type,
245 * low 16 bits zero.
246 */
mk_swap_pte(unsigned long type, unsigned long offset)247 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
248 { pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; }
249
250 #define __swp_type(x) (((x).val >> 16) & 0xff)
251 #define __swp_offset(x) ((x).val >> 24)
252 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
253 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
254 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
255 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
256 #define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE })
257
258 #endif /* !__ASSEMBLY__ */
259
260 #endif /* _ASM_PGTABLE_64_H */
261