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:
22 #define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
23 #define PTRS_PER_PMD 1
24 #define PTRS_PER_PTE (PAGE_SIZE / sizeof(pte_t))
26 #define pte_ERROR(e) \
27 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
28 #define pgd_ERROR(e) \
29 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
31 #define pmd_pfn(pmd) (pmd_phys(pmd) >> PAGE_SHIFT)
32 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
33 #define pte_clear(mm, addr, ptep) set_pte((ptep), \
34 (((unsigned int) addr >= PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
35 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
36 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
37 #define pte_pfn(x) ((unsigned long)((x).pte_low >> PAGE_SHIFT))
38 #define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
41 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
42 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
44 #define pte_page(x) pfn_to_page(pte_pfn(x))
45 #define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \
49 * C-SKY only has VALID and DIRTY bit in hardware. So we need to use the
50 * two bits emulate PRESENT, READ, WRITE, EXEC, MODIFIED, ACCESSED.
52 #define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED)
54 #define PAGE_NONE __pgprot(_PAGE_PROT_NONE)
55 #define PAGE_READ __pgprot(_PAGE_BASE | _PAGE_READ | \
57 #define PAGE_WRITE __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE | \
59 #define PAGE_SHARED PAGE_WRITE
61 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
62 _PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
66 #define _PAGE_IOREMAP (_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
67 _PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
69 _CACHE_UNCACHED | _PAGE_SO)
71 #define _PAGE_CHG_MASK (~(unsigned long) \
72 (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
73 _CACHE_MASK | _PAGE_GLOBAL))
75 #define MAX_SWAPFILES_CHECK() \
76 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT != 5)
78 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
79 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
81 extern void load_pgd(unsigned long pg_dir);
82 extern pte_t invalid_pte_table[PTRS_PER_PTE];
84 static inline void set_pte(pte_t *p, pte_t pte)
87 #if defined(CONFIG_CPU_NEED_TLBSYNC)
88 dcache_wb_line((u32)p);
90 /* prevent out of order excution */
93 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
95 static inline pte_t *pmd_page_vaddr(pmd_t pmd)
104 #define pmd_phys(pmd) pmd_val(pmd)
106 static inline void set_pmd(pmd_t *p, pmd_t pmd)
109 #if defined(CONFIG_CPU_NEED_TLBSYNC)
110 dcache_wb_line((u32)p);
112 /* prevent specul excute */
117 static inline int pmd_none(pmd_t pmd)
119 return pmd_val(pmd) == __pa(invalid_pte_table);
122 #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
124 static inline int pmd_present(pmd_t pmd)
126 return (pmd_val(pmd) != __pa(invalid_pte_table));
129 static inline void pmd_clear(pmd_t *p)
131 pmd_val(*p) = (__pa(invalid_pte_table));
132 #if defined(CONFIG_CPU_NEED_TLBSYNC)
133 dcache_wb_line((u32)p);
138 * The following only work if pte_present() is true.
139 * Undefined behaviour if not..
141 static inline int pte_read(pte_t pte)
143 return pte.pte_low & _PAGE_READ;
146 static inline int pte_write(pte_t pte)
148 return (pte).pte_low & _PAGE_WRITE;
151 static inline int pte_dirty(pte_t pte)
153 return (pte).pte_low & _PAGE_MODIFIED;
156 static inline int pte_young(pte_t pte)
158 return (pte).pte_low & _PAGE_ACCESSED;
161 static inline pte_t pte_wrprotect(pte_t pte)
163 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
167 static inline pte_t pte_mkclean(pte_t pte)
169 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
173 static inline pte_t pte_mkold(pte_t pte)
175 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
179 static inline pte_t pte_mkwrite(pte_t pte)
181 pte_val(pte) |= _PAGE_WRITE;
182 if (pte_val(pte) & _PAGE_MODIFIED)
183 pte_val(pte) |= _PAGE_DIRTY;
187 static inline pte_t pte_mkdirty(pte_t pte)
189 pte_val(pte) |= _PAGE_MODIFIED;
190 if (pte_val(pte) & _PAGE_WRITE)
191 pte_val(pte) |= _PAGE_DIRTY;
195 static inline pte_t pte_mkyoung(pte_t pte)
197 pte_val(pte) |= _PAGE_ACCESSED;
198 if (pte_val(pte) & _PAGE_READ)
199 pte_val(pte) |= _PAGE_VALID;
203 #define __HAVE_PHYS_MEM_ACCESS_PROT
205 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
206 unsigned long size, pgprot_t vma_prot);
209 * Macro to make mark a page protection value as "uncacheable". Note
210 * that "protection" is really a misnomer here as the protection value
211 * contains the memory attribute bits, dirty bits, and various other
214 #define pgprot_noncached pgprot_noncached
216 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
218 unsigned long prot = pgprot_val(_prot);
220 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO;
222 return __pgprot(prot);
225 #define pgprot_writecombine pgprot_writecombine
226 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
228 unsigned long prot = pgprot_val(_prot);
230 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
232 return __pgprot(prot);
236 * Conversion functions: convert a page and protection to a page entry,
237 * and a page entry and page directory to the page they refer to.
239 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
240 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
242 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
243 (pgprot_val(newprot)));
246 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
247 extern void paging_init(void);
249 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
252 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
253 #define kern_addr_valid(addr) (1)
255 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
256 remap_pfn_range(vma, vaddr, pfn, size, prot)
258 #endif /* __ASM_CSKY_PGTABLE_H */