1 /* SPDX-License-Identifier: GPL-2.0 */
3 #ifndef __ASM_CSKY_PGTABLE_H
4 #define __ASM_CSKY_PGTABLE_H
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>
12 #define PGDIR_SHIFT 22
13 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
14 #define PGDIR_MASK (~(PGDIR_SIZE-1))
16 #define USER_PTRS_PER_PGD (PAGE_OFFSET/PGDIR_SIZE)
19 * C-SKY is two-level paging structure:
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))
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))
33 #define pmd_pfn(pmd) (pmd_phys(pmd) >> PAGE_SHIFT)
34 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
35 #define pte_clear(mm, addr, ptep) set_pte((ptep), \
36 (((unsigned int) addr >= PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
37 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
38 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
39 #define pte_pfn(x) ((unsigned long)((x).pte_low >> PAGE_SHIFT))
40 #define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
43 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
44 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
46 #define pte_page(x) pfn_to_page(pte_pfn(x))
47 #define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \
51 * C-SKY only has VALID and DIRTY bit in hardware. So we need to use the
52 * two bits emulate PRESENT, READ, WRITE, EXEC, MODIFIED, ACCESSED.
54 #define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED)
56 #define PAGE_NONE __pgprot(_PAGE_PROT_NONE)
57 #define PAGE_READ __pgprot(_PAGE_BASE | _PAGE_READ | \
59 #define PAGE_WRITE __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE | \
61 #define PAGE_SHARED PAGE_WRITE
63 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
64 _PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
68 #define _PAGE_IOREMAP (_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
69 _PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
71 _CACHE_UNCACHED | _PAGE_SO)
73 #define _PAGE_CHG_MASK (~(unsigned long) \
74 (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
75 _CACHE_MASK | _PAGE_GLOBAL))
77 #define MAX_SWAPFILES_CHECK() \
78 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT != 5)
80 #define __P000 PAGE_NONE
81 #define __P001 PAGE_READ
82 #define __P010 PAGE_READ
83 #define __P011 PAGE_READ
84 #define __P100 PAGE_READ
85 #define __P101 PAGE_READ
86 #define __P110 PAGE_READ
87 #define __P111 PAGE_READ
89 #define __S000 PAGE_NONE
90 #define __S001 PAGE_READ
91 #define __S010 PAGE_WRITE
92 #define __S011 PAGE_WRITE
93 #define __S100 PAGE_READ
94 #define __S101 PAGE_READ
95 #define __S110 PAGE_WRITE
96 #define __S111 PAGE_WRITE
98 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
99 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
101 extern void load_pgd(unsigned long pg_dir);
102 extern pte_t invalid_pte_table[PTRS_PER_PTE];
104 static inline void set_pte(pte_t *p, pte_t pte)
107 #if defined(CONFIG_CPU_NEED_TLBSYNC)
108 dcache_wb_line((u32)p);
110 /* prevent out of order excution */
113 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
115 static inline pte_t *pmd_page_vaddr(pmd_t pmd)
124 #define pmd_phys(pmd) pmd_val(pmd)
126 static inline void set_pmd(pmd_t *p, pmd_t pmd)
129 #if defined(CONFIG_CPU_NEED_TLBSYNC)
130 dcache_wb_line((u32)p);
132 /* prevent specul excute */
137 static inline int pmd_none(pmd_t pmd)
139 return pmd_val(pmd) == __pa(invalid_pte_table);
142 #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
144 static inline int pmd_present(pmd_t pmd)
146 return (pmd_val(pmd) != __pa(invalid_pte_table));
149 static inline void pmd_clear(pmd_t *p)
151 pmd_val(*p) = (__pa(invalid_pte_table));
152 #if defined(CONFIG_CPU_NEED_TLBSYNC)
153 dcache_wb_line((u32)p);
158 * The following only work if pte_present() is true.
159 * Undefined behaviour if not..
161 static inline int pte_read(pte_t pte)
163 return pte.pte_low & _PAGE_READ;
166 static inline int pte_write(pte_t pte)
168 return (pte).pte_low & _PAGE_WRITE;
171 static inline int pte_dirty(pte_t pte)
173 return (pte).pte_low & _PAGE_MODIFIED;
176 static inline int pte_young(pte_t pte)
178 return (pte).pte_low & _PAGE_ACCESSED;
181 static inline pte_t pte_wrprotect(pte_t pte)
183 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
187 static inline pte_t pte_mkclean(pte_t pte)
189 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
193 static inline pte_t pte_mkold(pte_t pte)
195 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
199 static inline pte_t pte_mkwrite(pte_t pte)
201 pte_val(pte) |= _PAGE_WRITE;
202 if (pte_val(pte) & _PAGE_MODIFIED)
203 pte_val(pte) |= _PAGE_DIRTY;
207 static inline pte_t pte_mkdirty(pte_t pte)
209 pte_val(pte) |= _PAGE_MODIFIED;
210 if (pte_val(pte) & _PAGE_WRITE)
211 pte_val(pte) |= _PAGE_DIRTY;
215 static inline pte_t pte_mkyoung(pte_t pte)
217 pte_val(pte) |= _PAGE_ACCESSED;
218 if (pte_val(pte) & _PAGE_READ)
219 pte_val(pte) |= _PAGE_VALID;
223 #define __HAVE_PHYS_MEM_ACCESS_PROT
225 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
226 unsigned long size, pgprot_t vma_prot);
229 * Macro to make mark a page protection value as "uncacheable". Note
230 * that "protection" is really a misnomer here as the protection value
231 * contains the memory attribute bits, dirty bits, and various other
234 #define pgprot_noncached pgprot_noncached
236 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
238 unsigned long prot = pgprot_val(_prot);
240 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO;
242 return __pgprot(prot);
245 #define pgprot_writecombine pgprot_writecombine
246 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
248 unsigned long prot = pgprot_val(_prot);
250 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
252 return __pgprot(prot);
256 * Conversion functions: convert a page and protection to a page entry,
257 * and a page entry and page directory to the page they refer to.
259 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
260 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
262 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
263 (pgprot_val(newprot)));
266 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
267 extern void paging_init(void);
269 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
272 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
273 #define kern_addr_valid(addr) (1)
275 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
276 remap_pfn_range(vma, vaddr, pfn, size, prot)
278 #endif /* __ASM_CSKY_PGTABLE_H */