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1/* SPDX-License-Identifier: GPL-2.0 */
2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4#ifndef __ASM_CSKY_PGTABLE_H
5#define __ASM_CSKY_PGTABLE_H
6
7#include <asm/fixmap.h>
8#include <asm/memory.h>
9#include <asm/addrspace.h>
10#include <abi/pgtable-bits.h>
11#include <asm-generic/pgtable-nopmd.h>
12
13#define PGDIR_SHIFT 22
14#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
15#define PGDIR_MASK (~(PGDIR_SIZE-1))
16
17#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
18#define FIRST_USER_ADDRESS 0UL
19
20/*
21 * C-SKY is two-level paging structure:
22 */
23#define PGD_ORDER 0
24#define PTE_ORDER 0
25
26#define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
27#define PTRS_PER_PMD 1
28#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
29
30#define pte_ERROR(e) \
31 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
32#define pgd_ERROR(e) \
33 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
34
35/* Find an entry in the third-level page table.. */
36#define __pte_offset_t(address) \
37 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
38#define pte_offset_kernel(dir, address) \
39 (pmd_page_vaddr(*(dir)) + __pte_offset_t(address))
40#define pte_offset_map(dir, address) \
41 ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset_t(address))
42#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
43#define pte_clear(mm, addr, ptep) set_pte((ptep), \
44 (((unsigned int) addr & PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
45#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
46#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
47#define pte_pfn(x) ((unsigned long)((x).pte_low >> PAGE_SHIFT))
48#define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
49 | pgprot_val(prot))
50
51#define __READABLE (_PAGE_READ | _PAGE_VALID | _PAGE_ACCESSED)
52#define __WRITEABLE (_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED)
53
54#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | \
55 _CACHE_MASK)
56
57#define pte_unmap(pte) ((void)(pte))
58
59#define __swp_type(x) (((x).val >> 4) & 0xff)
60#define __swp_offset(x) ((x).val >> 12)
61#define __swp_entry(type, offset) ((swp_entry_t) {((type) << 4) | \
62 ((offset) << 12) })
63#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
64#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
65
66#define pte_page(x) pfn_to_page(pte_pfn(x))
67#define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \
68 pgprot_val(pgprot))
69
70/*
71 * CSKY can't do page protection for execute, and considers that the same like
72 * read. Also, write permissions imply read permissions. This is the closest
73 * we can get by reasonable means..
74 */
75#define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHED)
76#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
77 _CACHE_CACHED)
78#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
79#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
80#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
81 _PAGE_GLOBAL | _CACHE_CACHED)
82#define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
83 _CACHE_CACHED)
84
85#define _PAGE_IOREMAP \
86 (_PAGE_PRESENT | __READABLE | __WRITEABLE | _PAGE_GLOBAL | \
87 _CACHE_UNCACHED | _PAGE_SO)
88
89#define __P000 PAGE_NONE
90#define __P001 PAGE_READONLY
91#define __P010 PAGE_COPY
92#define __P011 PAGE_COPY
93#define __P100 PAGE_READONLY
94#define __P101 PAGE_READONLY
95#define __P110 PAGE_COPY
96#define __P111 PAGE_COPY
97
98#define __S000 PAGE_NONE
99#define __S001 PAGE_READONLY
100#define __S010 PAGE_SHARED
101#define __S011 PAGE_SHARED
102#define __S100 PAGE_READONLY
103#define __S101 PAGE_READONLY
104#define __S110 PAGE_SHARED
105#define __S111 PAGE_SHARED
106
107extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
108#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
109
110extern void load_pgd(unsigned long pg_dir);
111extern pte_t invalid_pte_table[PTRS_PER_PTE];
112
113static inline int pte_special(pte_t pte) { return 0; }
114static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
115
116static inline void set_pte(pte_t *p, pte_t pte)
117{
118 *p = pte;
119#if defined(CONFIG_CPU_NEED_TLBSYNC)
120 dcache_wb_line((u32)p);
121#endif
122 /* prevent out of order excution */
123 smp_mb();
124}
125#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
126
127static inline pte_t *pmd_page_vaddr(pmd_t pmd)
128{
129 unsigned long ptr;
130
131 ptr = pmd_val(pmd);
132
133 return __va(ptr);
134}
135
136#define pmd_phys(pmd) pmd_val(pmd)
137
138static inline void set_pmd(pmd_t *p, pmd_t pmd)
139{
140 *p = pmd;
141#if defined(CONFIG_CPU_NEED_TLBSYNC)
142 dcache_wb_line((u32)p);
143#endif
144 /* prevent specul excute */
145 smp_mb();
146}
147
148
149static inline int pmd_none(pmd_t pmd)
150{
151 return pmd_val(pmd) == __pa(invalid_pte_table);
152}
153
154#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
155
156static inline int pmd_present(pmd_t pmd)
157{
158 return (pmd_val(pmd) != __pa(invalid_pte_table));
159}
160
161static inline void pmd_clear(pmd_t *p)
162{
163 pmd_val(*p) = (__pa(invalid_pte_table));
164#if defined(CONFIG_CPU_NEED_TLBSYNC)
165 dcache_wb_line((u32)p);
166#endif
167}
168
169/*
170 * The following only work if pte_present() is true.
171 * Undefined behaviour if not..
172 */
173static inline int pte_read(pte_t pte)
174{
175 return pte.pte_low & _PAGE_READ;
176}
177
178static inline int pte_write(pte_t pte)
179{
180 return (pte).pte_low & _PAGE_WRITE;
181}
182
183static inline int pte_dirty(pte_t pte)
184{
185 return (pte).pte_low & _PAGE_MODIFIED;
186}
187
188static inline int pte_young(pte_t pte)
189{
190 return (pte).pte_low & _PAGE_ACCESSED;
191}
192
193static inline pte_t pte_wrprotect(pte_t pte)
194{
195 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
196 return pte;
197}
198
199static inline pte_t pte_mkclean(pte_t pte)
200{
201 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
202 return pte;
203}
204
205static inline pte_t pte_mkold(pte_t pte)
206{
207 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
208 return pte;
209}
210
211static inline pte_t pte_mkwrite(pte_t pte)
212{
213 pte_val(pte) |= _PAGE_WRITE;
214 if (pte_val(pte) & _PAGE_MODIFIED)
215 pte_val(pte) |= _PAGE_DIRTY;
216 return pte;
217}
218
219static inline pte_t pte_mkdirty(pte_t pte)
220{
221 pte_val(pte) |= _PAGE_MODIFIED;
222 if (pte_val(pte) & _PAGE_WRITE)
223 pte_val(pte) |= _PAGE_DIRTY;
224 return pte;
225}
226
227static inline pte_t pte_mkyoung(pte_t pte)
228{
229 pte_val(pte) |= _PAGE_ACCESSED;
230 if (pte_val(pte) & _PAGE_READ)
231 pte_val(pte) |= _PAGE_VALID;
232 return pte;
233}
234
235#define __pgd_offset(address) pgd_index(address)
236#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
237#define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
238
239/* to find an entry in a kernel page-table-directory */
240#define pgd_offset_k(address) pgd_offset(&init_mm, address)
241
242#define pgd_index(address) ((address) >> PGDIR_SHIFT)
243
244#define __HAVE_PHYS_MEM_ACCESS_PROT
245struct file;
246extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
247 unsigned long size, pgprot_t vma_prot);
248
249/*
250 * Macro to make mark a page protection value as "uncacheable". Note
251 * that "protection" is really a misnomer here as the protection value
252 * contains the memory attribute bits, dirty bits, and various other
253 * bits as well.
254 */
255#define pgprot_noncached pgprot_noncached
256
257static inline pgprot_t pgprot_noncached(pgprot_t _prot)
258{
259 unsigned long prot = pgprot_val(_prot);
260
261 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO;
262
263 return __pgprot(prot);
264}
265
266#define pgprot_writecombine pgprot_writecombine
267static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
268{
269 unsigned long prot = pgprot_val(_prot);
270
271 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
272
273 return __pgprot(prot);
274}
275
276/*
277 * Conversion functions: convert a page and protection to a page entry,
278 * and a page entry and page directory to the page they refer to.
279 */
280#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
281static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
282{
283 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
284 (pgprot_val(newprot)));
285}
286
287/* to find an entry in a page-table-directory */
288static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address)
289{
290 return mm->pgd + pgd_index(address);
291}
292
293/* Find an entry in the third-level page table.. */
294static inline pte_t *pte_offset(pmd_t *dir, unsigned long address)
295{
296 return (pte_t *) (pmd_page_vaddr(*dir)) +
297 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
298}
299
300extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
301extern void paging_init(void);
302
303void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
304 pte_t *pte);
305
306/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
307#define kern_addr_valid(addr) (1)
308
309#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
310 remap_pfn_range(vma, vaddr, pfn, size, prot)
311
312#include <asm-generic/pgtable.h>
313
314#endif /* __ASM_CSKY_PGTABLE_H */