1 /* SPDX-License-Identifier: GPL-2.0 */
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
4 #ifndef __ASM_CSKY_PGTABLE_H
5 #define __ASM_CSKY_PGTABLE_H
7 #include <asm/fixmap.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 (0x80000000UL/PGDIR_SIZE)
17 #define FIRST_USER_ADDRESS 0UL
19 #define PKMAP_BASE (0xff800000)
21 #define VMALLOC_START (0xc0008000)
22 #define VMALLOC_END (PKMAP_BASE - 2*PAGE_SIZE)
25 * C-SKY is two-level paging structure:
30 #define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
31 #define PTRS_PER_PMD 1
32 #define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
34 #define pte_ERROR(e) \
35 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
36 #define pgd_ERROR(e) \
37 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
39 /* Find an entry in the third-level page table.. */
40 #define __pte_offset_t(address) \
41 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
42 #define pte_offset_kernel(dir, address) \
43 (pmd_page_vaddr(*(dir)) + __pte_offset_t(address))
44 #define pte_offset_map(dir, address) \
45 ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset_t(address))
46 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
47 #define pte_clear(mm, addr, ptep) set_pte((ptep), \
48 (((unsigned int) addr & PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
49 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
50 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
51 #define pte_pfn(x) ((unsigned long)((x).pte_low >> PAGE_SHIFT))
52 #define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
55 #define __READABLE (_PAGE_READ | _PAGE_VALID | _PAGE_ACCESSED)
56 #define __WRITEABLE (_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED)
58 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | \
61 #define pte_unmap(pte) ((void)(pte))
63 #define __swp_type(x) (((x).val >> 4) & 0xff)
64 #define __swp_offset(x) ((x).val >> 12)
65 #define __swp_entry(type, offset) ((swp_entry_t) {((type) << 4) | \
67 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
68 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
70 #define pte_page(x) pfn_to_page(pte_pfn(x))
71 #define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \
75 * CSKY can't do page protection for execute, and considers that the same like
76 * read. Also, write permissions imply read permissions. This is the closest
77 * we can get by reasonable means..
79 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHED)
80 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
82 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
83 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
84 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
85 _PAGE_GLOBAL | _CACHE_CACHED)
86 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
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
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
107 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
108 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
110 extern void load_pgd(unsigned long pg_dir);
111 extern pte_t invalid_pte_table[PTRS_PER_PTE];
113 static inline int pte_special(pte_t pte) { return 0; }
114 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
116 static inline void set_pte(pte_t *p, pte_t pte)
119 #if defined(CONFIG_CPU_NEED_TLBSYNC)
120 dcache_wb_line((u32)p);
122 /* prevent out of order excution */
125 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
127 static inline pte_t *pmd_page_vaddr(pmd_t pmd)
136 #define pmd_phys(pmd) pmd_val(pmd)
138 static inline void set_pmd(pmd_t *p, pmd_t pmd)
141 #if defined(CONFIG_CPU_NEED_TLBSYNC)
142 dcache_wb_line((u32)p);
144 /* prevent specul excute */
149 static inline int pmd_none(pmd_t pmd)
151 return pmd_val(pmd) == __pa(invalid_pte_table);
154 #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
156 static inline int pmd_present(pmd_t pmd)
158 return (pmd_val(pmd) != __pa(invalid_pte_table));
161 static inline void pmd_clear(pmd_t *p)
163 pmd_val(*p) = (__pa(invalid_pte_table));
164 #if defined(CONFIG_CPU_NEED_TLBSYNC)
165 dcache_wb_line((u32)p);
170 * The following only work if pte_present() is true.
171 * Undefined behaviour if not..
173 static inline int pte_read(pte_t pte)
175 return pte.pte_low & _PAGE_READ;
178 static inline int pte_write(pte_t pte)
180 return (pte).pte_low & _PAGE_WRITE;
183 static inline int pte_dirty(pte_t pte)
185 return (pte).pte_low & _PAGE_MODIFIED;
188 static inline int pte_young(pte_t pte)
190 return (pte).pte_low & _PAGE_ACCESSED;
193 static inline pte_t pte_wrprotect(pte_t pte)
195 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
199 static inline pte_t pte_mkclean(pte_t pte)
201 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
205 static inline pte_t pte_mkold(pte_t pte)
207 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
211 static inline pte_t pte_mkwrite(pte_t pte)
213 pte_val(pte) |= _PAGE_WRITE;
214 if (pte_val(pte) & _PAGE_MODIFIED)
215 pte_val(pte) |= _PAGE_DIRTY;
219 static inline pte_t pte_mkdirty(pte_t pte)
221 pte_val(pte) |= _PAGE_MODIFIED;
222 if (pte_val(pte) & _PAGE_WRITE)
223 pte_val(pte) |= _PAGE_DIRTY;
227 static inline pte_t pte_mkyoung(pte_t pte)
229 pte_val(pte) |= _PAGE_ACCESSED;
230 if (pte_val(pte) & _PAGE_READ)
231 pte_val(pte) |= _PAGE_VALID;
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))
239 /* to find an entry in a kernel page-table-directory */
240 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
242 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
244 #define __HAVE_PHYS_MEM_ACCESS_PROT
246 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
247 unsigned long size, pgprot_t vma_prot);
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
255 #define pgprot_noncached pgprot_noncached
257 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
259 unsigned long prot = pgprot_val(_prot);
261 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
263 return __pgprot(prot);
267 * Conversion functions: convert a page and protection to a page entry,
268 * and a page entry and page directory to the page they refer to.
270 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
271 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
273 return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
274 (pgprot_val(newprot)));
277 /* to find an entry in a page-table-directory */
278 static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address)
280 return mm->pgd + pgd_index(address);
283 /* Find an entry in the third-level page table.. */
284 static inline pte_t *pte_offset(pmd_t *dir, unsigned long address)
286 return (pte_t *) (pmd_page_vaddr(*dir)) +
287 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
290 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
291 extern void paging_init(void);
293 extern void show_jtlb_table(void);
295 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
298 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
299 #define kern_addr_valid(addr) (1)
302 * No page table caches to initialise
304 #define pgtable_cache_init() do {} while (0)
306 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
307 remap_pfn_range(vma, vaddr, pfn, size, prot)
309 #include <asm-generic/pgtable.h>
311 #endif /* __ASM_CSKY_PGTABLE_H */