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 (0x80000000UL/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_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHED) 67 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 68 _CACHE_CACHED) 69 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED) 70 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED) 71 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 72 _PAGE_GLOBAL | _CACHE_CACHED) 73 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 74 _CACHE_CACHED) 75 76 #define _PAGE_IOREMAP \ 77 (_PAGE_PRESENT | __READABLE | __WRITEABLE | _PAGE_GLOBAL | \ 78 _CACHE_UNCACHED | _PAGE_SO) 79 80 #define __P000 PAGE_NONE 81 #define __P001 PAGE_READONLY 82 #define __P010 PAGE_COPY 83 #define __P011 PAGE_COPY 84 #define __P100 PAGE_READONLY 85 #define __P101 PAGE_READONLY 86 #define __P110 PAGE_COPY 87 #define __P111 PAGE_COPY 88 89 #define __S000 PAGE_NONE 90 #define __S001 PAGE_READONLY 91 #define __S010 PAGE_SHARED 92 #define __S011 PAGE_SHARED 93 #define __S100 PAGE_READONLY 94 #define __S101 PAGE_READONLY 95 #define __S110 PAGE_SHARED 96 #define __S111 PAGE_SHARED 97 98 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 99 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 100 101 extern void load_pgd(unsigned long pg_dir); 102 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 103 104 static inline void set_pte(pte_t *p, pte_t pte) 105 { 106 *p = pte; 107 #if defined(CONFIG_CPU_NEED_TLBSYNC) 108 dcache_wb_line((u32)p); 109 #endif 110 /* prevent out of order excution */ 111 smp_mb(); 112 } 113 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 114 115 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 116 { 117 unsigned long ptr; 118 119 ptr = pmd_val(pmd); 120 121 return __va(ptr); 122 } 123 124 #define pmd_phys(pmd) pmd_val(pmd) 125 126 static inline void set_pmd(pmd_t *p, pmd_t pmd) 127 { 128 *p = pmd; 129 #if defined(CONFIG_CPU_NEED_TLBSYNC) 130 dcache_wb_line((u32)p); 131 #endif 132 /* prevent specul excute */ 133 smp_mb(); 134 } 135 136 137 static inline int pmd_none(pmd_t pmd) 138 { 139 return pmd_val(pmd) == __pa(invalid_pte_table); 140 } 141 142 #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) 143 144 static inline int pmd_present(pmd_t pmd) 145 { 146 return (pmd_val(pmd) != __pa(invalid_pte_table)); 147 } 148 149 static inline void pmd_clear(pmd_t *p) 150 { 151 pmd_val(*p) = (__pa(invalid_pte_table)); 152 #if defined(CONFIG_CPU_NEED_TLBSYNC) 153 dcache_wb_line((u32)p); 154 #endif 155 } 156 157 /* 158 * The following only work if pte_present() is true. 159 * Undefined behaviour if not.. 160 */ 161 static inline int pte_read(pte_t pte) 162 { 163 return pte.pte_low & _PAGE_READ; 164 } 165 166 static inline int pte_write(pte_t pte) 167 { 168 return (pte).pte_low & _PAGE_WRITE; 169 } 170 171 static inline int pte_dirty(pte_t pte) 172 { 173 return (pte).pte_low & _PAGE_MODIFIED; 174 } 175 176 static inline int pte_young(pte_t pte) 177 { 178 return (pte).pte_low & _PAGE_ACCESSED; 179 } 180 181 static inline pte_t pte_wrprotect(pte_t pte) 182 { 183 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 184 return pte; 185 } 186 187 static inline pte_t pte_mkclean(pte_t pte) 188 { 189 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY); 190 return pte; 191 } 192 193 static inline pte_t pte_mkold(pte_t pte) 194 { 195 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID); 196 return pte; 197 } 198 199 static inline pte_t pte_mkwrite(pte_t pte) 200 { 201 pte_val(pte) |= _PAGE_WRITE; 202 if (pte_val(pte) & _PAGE_MODIFIED) 203 pte_val(pte) |= _PAGE_DIRTY; 204 return pte; 205 } 206 207 static inline pte_t pte_mkdirty(pte_t pte) 208 { 209 pte_val(pte) |= _PAGE_MODIFIED; 210 if (pte_val(pte) & _PAGE_WRITE) 211 pte_val(pte) |= _PAGE_DIRTY; 212 return pte; 213 } 214 215 static inline pte_t pte_mkyoung(pte_t pte) 216 { 217 pte_val(pte) |= _PAGE_ACCESSED; 218 if (pte_val(pte) & _PAGE_READ) 219 pte_val(pte) |= _PAGE_VALID; 220 return pte; 221 } 222 223 #define __HAVE_PHYS_MEM_ACCESS_PROT 224 struct file; 225 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 226 unsigned long size, pgprot_t vma_prot); 227 228 /* 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 232 * bits as well. 233 */ 234 #define pgprot_noncached pgprot_noncached 235 236 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 237 { 238 unsigned long prot = pgprot_val(_prot); 239 240 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO; 241 242 return __pgprot(prot); 243 } 244 245 #define pgprot_writecombine pgprot_writecombine 246 static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 247 { 248 unsigned long prot = pgprot_val(_prot); 249 250 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 251 252 return __pgprot(prot); 253 } 254 255 /* 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. 258 */ 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) 261 { 262 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 263 (pgprot_val(newprot))); 264 } 265 266 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 267 extern void paging_init(void); 268 269 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, 270 pte_t *pte); 271 272 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 273 #define kern_addr_valid(addr) (1) 274 275 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 276 remap_pfn_range(vma, vaddr, pfn, size, prot) 277 278 #endif /* __ASM_CSKY_PGTABLE_H */ 279