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 (PAGE_OFFSET/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 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 36 #define pte_clear(mm, addr, ptep) set_pte((ptep), \ 37 (((unsigned int) addr >= PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0))) 38 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 39 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 40 #define pte_pfn(x) ((unsigned long)((x).pte_low >> PAGE_SHIFT)) 41 #define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \ 42 | pgprot_val(prot)) 43 44 #define __READABLE (_PAGE_READ | _PAGE_VALID | _PAGE_ACCESSED) 45 #define __WRITEABLE (_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED) 46 47 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | \ 48 _CACHE_MASK) 49 50 #define __swp_type(x) (((x).val >> 4) & 0xff) 51 #define __swp_offset(x) ((x).val >> 12) 52 #define __swp_entry(type, offset) ((swp_entry_t) {((type) << 4) | \ 53 ((offset) << 12) }) 54 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 55 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 56 57 #define pte_page(x) pfn_to_page(pte_pfn(x)) 58 #define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \ 59 pgprot_val(pgprot)) 60 61 /* 62 * CSKY can't do page protection for execute, and considers that the same like 63 * read. Also, write permissions imply read permissions. This is the closest 64 * we can get by reasonable means.. 65 */ 66 #define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED) 67 68 #define PAGE_NONE __pgprot(_PAGE_BASE | _CACHE_CACHED) 69 #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE | \ 70 _CACHE_CACHED) 71 #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_READ | _CACHE_CACHED) 72 #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_READ | _CACHE_CACHED) 73 #define PAGE_KERNEL __pgprot(_PAGE_BASE | __READABLE | __WRITEABLE | \ 74 _PAGE_GLOBAL | _CACHE_CACHED) 75 #define PAGE_USERIO __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE | \ 76 _CACHE_CACHED) 77 78 #define _PAGE_IOREMAP \ 79 (_PAGE_BASE | __READABLE | __WRITEABLE | _PAGE_GLOBAL | \ 80 _CACHE_UNCACHED | _PAGE_SO) 81 82 #define __P000 PAGE_NONE 83 #define __P001 PAGE_READONLY 84 #define __P010 PAGE_COPY 85 #define __P011 PAGE_COPY 86 #define __P100 PAGE_READONLY 87 #define __P101 PAGE_READONLY 88 #define __P110 PAGE_COPY 89 #define __P111 PAGE_COPY 90 91 #define __S000 PAGE_NONE 92 #define __S001 PAGE_READONLY 93 #define __S010 PAGE_SHARED 94 #define __S011 PAGE_SHARED 95 #define __S100 PAGE_READONLY 96 #define __S101 PAGE_READONLY 97 #define __S110 PAGE_SHARED 98 #define __S111 PAGE_SHARED 99 100 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 101 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 102 103 extern void load_pgd(unsigned long pg_dir); 104 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 105 106 static inline void set_pte(pte_t *p, pte_t pte) 107 { 108 *p = pte; 109 #if defined(CONFIG_CPU_NEED_TLBSYNC) 110 dcache_wb_line((u32)p); 111 #endif 112 /* prevent out of order excution */ 113 smp_mb(); 114 } 115 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 116 117 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 118 { 119 unsigned long ptr; 120 121 ptr = pmd_val(pmd); 122 123 return __va(ptr); 124 } 125 126 #define pmd_phys(pmd) pmd_val(pmd) 127 128 static inline void set_pmd(pmd_t *p, pmd_t pmd) 129 { 130 *p = pmd; 131 #if defined(CONFIG_CPU_NEED_TLBSYNC) 132 dcache_wb_line((u32)p); 133 #endif 134 /* prevent specul excute */ 135 smp_mb(); 136 } 137 138 139 static inline int pmd_none(pmd_t pmd) 140 { 141 return pmd_val(pmd) == __pa(invalid_pte_table); 142 } 143 144 #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) 145 146 static inline int pmd_present(pmd_t pmd) 147 { 148 return (pmd_val(pmd) != __pa(invalid_pte_table)); 149 } 150 151 static inline void pmd_clear(pmd_t *p) 152 { 153 pmd_val(*p) = (__pa(invalid_pte_table)); 154 #if defined(CONFIG_CPU_NEED_TLBSYNC) 155 dcache_wb_line((u32)p); 156 #endif 157 } 158 159 /* 160 * The following only work if pte_present() is true. 161 * Undefined behaviour if not.. 162 */ 163 static inline int pte_read(pte_t pte) 164 { 165 return pte.pte_low & _PAGE_READ; 166 } 167 168 static inline int pte_write(pte_t pte) 169 { 170 return (pte).pte_low & _PAGE_WRITE; 171 } 172 173 static inline int pte_dirty(pte_t pte) 174 { 175 return (pte).pte_low & _PAGE_MODIFIED; 176 } 177 178 static inline int pte_young(pte_t pte) 179 { 180 return (pte).pte_low & _PAGE_ACCESSED; 181 } 182 183 static inline pte_t pte_wrprotect(pte_t pte) 184 { 185 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 186 return pte; 187 } 188 189 static inline pte_t pte_mkclean(pte_t pte) 190 { 191 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY); 192 return pte; 193 } 194 195 static inline pte_t pte_mkold(pte_t pte) 196 { 197 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID); 198 return pte; 199 } 200 201 static inline pte_t pte_mkwrite(pte_t pte) 202 { 203 pte_val(pte) |= _PAGE_WRITE; 204 if (pte_val(pte) & _PAGE_MODIFIED) 205 pte_val(pte) |= _PAGE_DIRTY; 206 return pte; 207 } 208 209 static inline pte_t pte_mkdirty(pte_t pte) 210 { 211 pte_val(pte) |= _PAGE_MODIFIED; 212 if (pte_val(pte) & _PAGE_WRITE) 213 pte_val(pte) |= _PAGE_DIRTY; 214 return pte; 215 } 216 217 static inline pte_t pte_mkyoung(pte_t pte) 218 { 219 pte_val(pte) |= _PAGE_ACCESSED; 220 if (pte_val(pte) & _PAGE_READ) 221 pte_val(pte) |= _PAGE_VALID; 222 return pte; 223 } 224 225 #define __HAVE_PHYS_MEM_ACCESS_PROT 226 struct file; 227 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 228 unsigned long size, pgprot_t vma_prot); 229 230 /* 231 * Macro to make mark a page protection value as "uncacheable". Note 232 * that "protection" is really a misnomer here as the protection value 233 * contains the memory attribute bits, dirty bits, and various other 234 * bits as well. 235 */ 236 #define pgprot_noncached pgprot_noncached 237 238 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 239 { 240 unsigned long prot = pgprot_val(_prot); 241 242 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO; 243 244 return __pgprot(prot); 245 } 246 247 #define pgprot_writecombine pgprot_writecombine 248 static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 249 { 250 unsigned long prot = pgprot_val(_prot); 251 252 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 253 254 return __pgprot(prot); 255 } 256 257 /* 258 * Conversion functions: convert a page and protection to a page entry, 259 * and a page entry and page directory to the page they refer to. 260 */ 261 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 262 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 263 { 264 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 265 (pgprot_val(newprot))); 266 } 267 268 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 269 extern void paging_init(void); 270 271 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, 272 pte_t *pte); 273 274 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 275 #define kern_addr_valid(addr) (1) 276 277 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 278 remap_pfn_range(vma, vaddr, pfn, size, prot) 279 280 #endif /* __ASM_CSKY_PGTABLE_H */ 281