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