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 __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 45 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 46 47 #define pte_page(x) pfn_to_page(pte_pfn(x)) 48 #define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \ 49 pgprot_val(pgprot)) 50 51 /* 52 * C-SKY only has VALID and DIRTY bit in hardware. So we need to use the 53 * two bits emulate PRESENT, READ, WRITE, EXEC, MODIFIED, ACCESSED. 54 */ 55 #define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED) 56 57 #define PAGE_NONE __pgprot(_PAGE_PROT_NONE) 58 #define PAGE_READ __pgprot(_PAGE_BASE | _PAGE_READ | \ 59 _CACHE_CACHED) 60 #define PAGE_WRITE __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE | \ 61 _CACHE_CACHED) 62 #define PAGE_SHARED PAGE_WRITE 63 64 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \ 65 _PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \ 66 _PAGE_GLOBAL | \ 67 _CACHE_CACHED) 68 69 #define _PAGE_IOREMAP (_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \ 70 _PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \ 71 _PAGE_GLOBAL | \ 72 _CACHE_UNCACHED | _PAGE_SO) 73 74 #define _PAGE_CHG_MASK (~(unsigned long) \ 75 (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 76 _CACHE_MASK | _PAGE_GLOBAL)) 77 78 #define MAX_SWAPFILES_CHECK() \ 79 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT != 5) 80 81 #define __P000 PAGE_NONE 82 #define __P001 PAGE_READ 83 #define __P010 PAGE_READ 84 #define __P011 PAGE_READ 85 #define __P100 PAGE_READ 86 #define __P101 PAGE_READ 87 #define __P110 PAGE_READ 88 #define __P111 PAGE_READ 89 90 #define __S000 PAGE_NONE 91 #define __S001 PAGE_READ 92 #define __S010 PAGE_WRITE 93 #define __S011 PAGE_WRITE 94 #define __S100 PAGE_READ 95 #define __S101 PAGE_READ 96 #define __S110 PAGE_WRITE 97 #define __S111 PAGE_WRITE 98 99 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 100 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 101 102 extern void load_pgd(unsigned long pg_dir); 103 extern pte_t invalid_pte_table[PTRS_PER_PTE]; 104 105 static inline void set_pte(pte_t *p, pte_t pte) 106 { 107 *p = pte; 108 #if defined(CONFIG_CPU_NEED_TLBSYNC) 109 dcache_wb_line((u32)p); 110 #endif 111 /* prevent out of order excution */ 112 smp_mb(); 113 } 114 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 115 116 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 117 { 118 unsigned long ptr; 119 120 ptr = pmd_val(pmd); 121 122 return __va(ptr); 123 } 124 125 #define pmd_phys(pmd) pmd_val(pmd) 126 127 static inline void set_pmd(pmd_t *p, pmd_t pmd) 128 { 129 *p = pmd; 130 #if defined(CONFIG_CPU_NEED_TLBSYNC) 131 dcache_wb_line((u32)p); 132 #endif 133 /* prevent specul excute */ 134 smp_mb(); 135 } 136 137 138 static inline int pmd_none(pmd_t pmd) 139 { 140 return pmd_val(pmd) == __pa(invalid_pte_table); 141 } 142 143 #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) 144 145 static inline int pmd_present(pmd_t pmd) 146 { 147 return (pmd_val(pmd) != __pa(invalid_pte_table)); 148 } 149 150 static inline void pmd_clear(pmd_t *p) 151 { 152 pmd_val(*p) = (__pa(invalid_pte_table)); 153 #if defined(CONFIG_CPU_NEED_TLBSYNC) 154 dcache_wb_line((u32)p); 155 #endif 156 } 157 158 /* 159 * The following only work if pte_present() is true. 160 * Undefined behaviour if not.. 161 */ 162 static inline int pte_read(pte_t pte) 163 { 164 return pte.pte_low & _PAGE_READ; 165 } 166 167 static inline int pte_write(pte_t pte) 168 { 169 return (pte).pte_low & _PAGE_WRITE; 170 } 171 172 static inline int pte_dirty(pte_t pte) 173 { 174 return (pte).pte_low & _PAGE_MODIFIED; 175 } 176 177 static inline int pte_young(pte_t pte) 178 { 179 return (pte).pte_low & _PAGE_ACCESSED; 180 } 181 182 static inline pte_t pte_wrprotect(pte_t pte) 183 { 184 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); 185 return pte; 186 } 187 188 static inline pte_t pte_mkclean(pte_t pte) 189 { 190 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY); 191 return pte; 192 } 193 194 static inline pte_t pte_mkold(pte_t pte) 195 { 196 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID); 197 return pte; 198 } 199 200 static inline pte_t pte_mkwrite(pte_t pte) 201 { 202 pte_val(pte) |= _PAGE_WRITE; 203 if (pte_val(pte) & _PAGE_MODIFIED) 204 pte_val(pte) |= _PAGE_DIRTY; 205 return pte; 206 } 207 208 static inline pte_t pte_mkdirty(pte_t pte) 209 { 210 pte_val(pte) |= _PAGE_MODIFIED; 211 if (pte_val(pte) & _PAGE_WRITE) 212 pte_val(pte) |= _PAGE_DIRTY; 213 return pte; 214 } 215 216 static inline pte_t pte_mkyoung(pte_t pte) 217 { 218 pte_val(pte) |= _PAGE_ACCESSED; 219 if (pte_val(pte) & _PAGE_READ) 220 pte_val(pte) |= _PAGE_VALID; 221 return pte; 222 } 223 224 #define __HAVE_PHYS_MEM_ACCESS_PROT 225 struct file; 226 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 227 unsigned long size, pgprot_t vma_prot); 228 229 /* 230 * Macro to make mark a page protection value as "uncacheable". Note 231 * that "protection" is really a misnomer here as the protection value 232 * contains the memory attribute bits, dirty bits, and various other 233 * bits as well. 234 */ 235 #define pgprot_noncached pgprot_noncached 236 237 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 238 { 239 unsigned long prot = pgprot_val(_prot); 240 241 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO; 242 243 return __pgprot(prot); 244 } 245 246 #define pgprot_writecombine pgprot_writecombine 247 static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 248 { 249 unsigned long prot = pgprot_val(_prot); 250 251 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 252 253 return __pgprot(prot); 254 } 255 256 /* 257 * Conversion functions: convert a page and protection to a page entry, 258 * and a page entry and page directory to the page they refer to. 259 */ 260 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 261 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 262 { 263 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | 264 (pgprot_val(newprot))); 265 } 266 267 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 268 extern void paging_init(void); 269 270 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, 271 pte_t *pte); 272 273 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 274 #define kern_addr_valid(addr) (1) 275 276 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 277 remap_pfn_range(vma, vaddr, pfn, size, prot) 278 279 #endif /* __ASM_CSKY_PGTABLE_H */ 280