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/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 (0x80000000UL/PGDIR_SIZE) 17 #define FIRST_USER_ADDRESS 0UL 18 19 #define PKMAP_BASE (0xff800000) 20 21 #define VMALLOC_START (0xc0008000) 22 #define VMALLOC_END (PKMAP_BASE - 2*PAGE_SIZE) 23 24 /* 25 * C-SKY is two-level paging structure: 26 */ 27 #define PGD_ORDER 0 28 #define PTE_ORDER 0 29 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)) 33 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)) 38 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) \ 53 | pgprot_val(prot)) 54 55 #define __READABLE (_PAGE_READ | _PAGE_VALID | _PAGE_ACCESSED) 56 #define __WRITEABLE (_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED) 57 58 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | \ 59 _CACHE_MASK) 60 61 #define pte_unmap(pte) ((void)(pte)) 62 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) | \ 66 ((offset) << 12) }) 67 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 68 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 69 70 #define pte_page(x) pfn_to_page(pte_pfn(x)) 71 #define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \ 72 pgprot_val(pgprot)) 73 74 /* 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.. 78 */ 79 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHED) 80 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 81 _CACHE_CACHED) 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 | \ 87 _CACHE_CACHED) 88 89 #define _PAGE_IOREMAP \ 90 (_PAGE_PRESENT | __READABLE | __WRITEABLE | _PAGE_GLOBAL | \ 91 _CACHE_UNCACHED | _PAGE_SO) 92 93 #define __P000 PAGE_NONE 94 #define __P001 PAGE_READONLY 95 #define __P010 PAGE_COPY 96 #define __P011 PAGE_COPY 97 #define __P100 PAGE_READONLY 98 #define __P101 PAGE_READONLY 99 #define __P110 PAGE_COPY 100 #define __P111 PAGE_COPY 101 102 #define __S000 PAGE_NONE 103 #define __S001 PAGE_READONLY 104 #define __S010 PAGE_SHARED 105 #define __S011 PAGE_SHARED 106 #define __S100 PAGE_READONLY 107 #define __S101 PAGE_READONLY 108 #define __S110 PAGE_SHARED 109 #define __S111 PAGE_SHARED 110 111 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 112 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 113 114 extern void load_pgd(unsigned long pg_dir); 115 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 116 117 static inline int pte_special(pte_t pte) { return 0; } 118 static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 119 120 static inline void set_pte(pte_t *p, pte_t pte) 121 { 122 *p = pte; 123 #if defined(CONFIG_CPU_NEED_TLBSYNC) 124 dcache_wb_line((u32)p); 125 #endif 126 /* prevent out of order excution */ 127 smp_mb(); 128 } 129 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 130 131 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 132 { 133 unsigned long ptr; 134 135 ptr = pmd_val(pmd); 136 137 return __va(ptr); 138 } 139 140 #define pmd_phys(pmd) pmd_val(pmd) 141 142 static inline void set_pmd(pmd_t *p, pmd_t pmd) 143 { 144 *p = pmd; 145 #if defined(CONFIG_CPU_NEED_TLBSYNC) 146 dcache_wb_line((u32)p); 147 #endif 148 /* prevent specul excute */ 149 smp_mb(); 150 } 151 152 153 static inline int pmd_none(pmd_t pmd) 154 { 155 return pmd_val(pmd) == __pa(invalid_pte_table); 156 } 157 158 #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) 159 160 static inline int pmd_present(pmd_t pmd) 161 { 162 return (pmd_val(pmd) != __pa(invalid_pte_table)); 163 } 164 165 static inline void pmd_clear(pmd_t *p) 166 { 167 pmd_val(*p) = (__pa(invalid_pte_table)); 168 #if defined(CONFIG_CPU_NEED_TLBSYNC) 169 dcache_wb_line((u32)p); 170 #endif 171 } 172 173 /* 174 * The following only work if pte_present() is true. 175 * Undefined behaviour if not.. 176 */ 177 static inline int pte_read(pte_t pte) 178 { 179 return pte.pte_low & _PAGE_READ; 180 } 181 182 static inline int pte_write(pte_t pte) 183 { 184 return (pte).pte_low & _PAGE_WRITE; 185 } 186 187 static inline int pte_dirty(pte_t pte) 188 { 189 return (pte).pte_low & _PAGE_MODIFIED; 190 } 191 192 static inline int pte_young(pte_t pte) 193 { 194 return (pte).pte_low & _PAGE_ACCESSED; 195 } 196 197 static inline pte_t pte_wrprotect(pte_t pte) 198 { 199 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 200 return pte; 201 } 202 203 static inline pte_t pte_mkclean(pte_t pte) 204 { 205 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY); 206 return pte; 207 } 208 209 static inline pte_t pte_mkold(pte_t pte) 210 { 211 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID); 212 return pte; 213 } 214 215 static inline pte_t pte_mkwrite(pte_t pte) 216 { 217 pte_val(pte) |= _PAGE_WRITE; 218 if (pte_val(pte) & _PAGE_MODIFIED) 219 pte_val(pte) |= _PAGE_DIRTY; 220 return pte; 221 } 222 223 static inline pte_t pte_mkdirty(pte_t pte) 224 { 225 pte_val(pte) |= _PAGE_MODIFIED; 226 if (pte_val(pte) & _PAGE_WRITE) 227 pte_val(pte) |= _PAGE_DIRTY; 228 return pte; 229 } 230 231 static inline pte_t pte_mkyoung(pte_t pte) 232 { 233 pte_val(pte) |= _PAGE_ACCESSED; 234 if (pte_val(pte) & _PAGE_READ) 235 pte_val(pte) |= _PAGE_VALID; 236 return pte; 237 } 238 239 #define __pgd_offset(address) pgd_index(address) 240 #define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) 241 #define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) 242 243 /* to find an entry in a kernel page-table-directory */ 244 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 245 246 #define pgd_index(address) ((address) >> PGDIR_SHIFT) 247 248 #define __HAVE_PHYS_MEM_ACCESS_PROT 249 struct file; 250 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 251 unsigned long size, pgprot_t vma_prot); 252 253 /* 254 * Macro to make mark a page protection value as "uncacheable". Note 255 * that "protection" is really a misnomer here as the protection value 256 * contains the memory attribute bits, dirty bits, and various other 257 * bits as well. 258 */ 259 #define pgprot_noncached pgprot_noncached 260 261 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 262 { 263 unsigned long prot = pgprot_val(_prot); 264 265 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO; 266 267 return __pgprot(prot); 268 } 269 270 #define pgprot_writecombine pgprot_writecombine 271 static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 272 { 273 unsigned long prot = pgprot_val(_prot); 274 275 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 276 277 return __pgprot(prot); 278 } 279 280 /* 281 * Conversion functions: convert a page and protection to a page entry, 282 * and a page entry and page directory to the page they refer to. 283 */ 284 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 285 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 286 { 287 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 288 (pgprot_val(newprot))); 289 } 290 291 /* to find an entry in a page-table-directory */ 292 static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address) 293 { 294 return mm->pgd + pgd_index(address); 295 } 296 297 /* Find an entry in the third-level page table.. */ 298 static inline pte_t *pte_offset(pmd_t *dir, unsigned long address) 299 { 300 return (pte_t *) (pmd_page_vaddr(*dir)) + 301 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); 302 } 303 304 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 305 extern void paging_init(void); 306 307 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, 308 pte_t *pte); 309 310 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 311 #define kern_addr_valid(addr) (1) 312 313 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 314 remap_pfn_range(vma, vaddr, pfn, size, prot) 315 316 #include <asm-generic/pgtable.h> 317 318 #endif /* __ASM_CSKY_PGTABLE_H */ 319