1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_NOHASH_PGTABLE_H 3 #define _ASM_POWERPC_NOHASH_PGTABLE_H 4 5 #if defined(CONFIG_PPC64) 6 #include <asm/nohash/64/pgtable.h> 7 #else 8 #include <asm/nohash/32/pgtable.h> 9 #endif 10 11 /* Permission masks used for kernel mappings */ 12 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW) 13 #define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | _PAGE_NO_CACHE) 14 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | _PAGE_NO_CACHE | _PAGE_GUARDED) 15 #define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX) 16 #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO) 17 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX) 18 19 #ifndef __ASSEMBLY__ 20 21 /* Generic accessors to PTE bits */ 22 #ifndef pte_write 23 static inline int pte_write(pte_t pte) 24 { 25 return pte_val(pte) & _PAGE_RW; 26 } 27 #endif 28 static inline int pte_read(pte_t pte) { return 1; } 29 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } 30 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 31 static inline int pte_none(pte_t pte) { return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; } 32 static inline bool pte_hashpte(pte_t pte) { return false; } 33 static inline bool pte_ci(pte_t pte) { return pte_val(pte) & _PAGE_NO_CACHE; } 34 static inline bool pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC; } 35 36 #ifdef CONFIG_NUMA_BALANCING 37 /* 38 * These work without NUMA balancing but the kernel does not care. See the 39 * comment in include/linux/pgtable.h . On powerpc, this will only 40 * work for user pages and always return true for kernel pages. 41 */ 42 static inline int pte_protnone(pte_t pte) 43 { 44 return pte_present(pte) && !pte_user(pte); 45 } 46 47 static inline int pmd_protnone(pmd_t pmd) 48 { 49 return pte_protnone(pmd_pte(pmd)); 50 } 51 #endif /* CONFIG_NUMA_BALANCING */ 52 53 static inline int pte_present(pte_t pte) 54 { 55 return pte_val(pte) & _PAGE_PRESENT; 56 } 57 58 static inline bool pte_hw_valid(pte_t pte) 59 { 60 return pte_val(pte) & _PAGE_PRESENT; 61 } 62 63 /* 64 * Don't just check for any non zero bits in __PAGE_USER, since for book3e 65 * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in 66 * _PAGE_USER. Need to explicitly match _PAGE_BAP_UR bit in that case too. 67 */ 68 #ifndef pte_user 69 static inline bool pte_user(pte_t pte) 70 { 71 return (pte_val(pte) & _PAGE_USER) == _PAGE_USER; 72 } 73 #endif 74 75 /* 76 * We only find page table entry in the last level 77 * Hence no need for other accessors 78 */ 79 #define pte_access_permitted pte_access_permitted 80 static inline bool pte_access_permitted(pte_t pte, bool write) 81 { 82 /* 83 * A read-only access is controlled by _PAGE_USER bit. 84 * We have _PAGE_READ set for WRITE and EXECUTE 85 */ 86 if (!pte_present(pte) || !pte_user(pte) || !pte_read(pte)) 87 return false; 88 89 if (write && !pte_write(pte)) 90 return false; 91 92 return true; 93 } 94 95 /* Conversion functions: convert a page and protection to a page entry, 96 * and a page entry and page directory to the page they refer to. 97 * 98 * Even if PTEs can be unsigned long long, a PFN is always an unsigned 99 * long for now. 100 */ 101 static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot) { 102 return __pte(((pte_basic_t)(pfn) << PTE_RPN_SHIFT) | 103 pgprot_val(pgprot)); } 104 static inline unsigned long pte_pfn(pte_t pte) { 105 return pte_val(pte) >> PTE_RPN_SHIFT; } 106 107 /* Generic modifiers for PTE bits */ 108 static inline pte_t pte_exprotect(pte_t pte) 109 { 110 return __pte(pte_val(pte) & ~_PAGE_EXEC); 111 } 112 113 static inline pte_t pte_mkclean(pte_t pte) 114 { 115 return __pte(pte_val(pte) & ~_PAGE_DIRTY); 116 } 117 118 static inline pte_t pte_mkold(pte_t pte) 119 { 120 return __pte(pte_val(pte) & ~_PAGE_ACCESSED); 121 } 122 123 static inline pte_t pte_mkspecial(pte_t pte) 124 { 125 return __pte(pte_val(pte) | _PAGE_SPECIAL); 126 } 127 128 #ifndef pte_mkhuge 129 static inline pte_t pte_mkhuge(pte_t pte) 130 { 131 return __pte(pte_val(pte)); 132 } 133 #endif 134 135 #ifndef pte_mkprivileged 136 static inline pte_t pte_mkprivileged(pte_t pte) 137 { 138 return __pte(pte_val(pte) & ~_PAGE_USER); 139 } 140 #endif 141 142 #ifndef pte_mkuser 143 static inline pte_t pte_mkuser(pte_t pte) 144 { 145 return __pte(pte_val(pte) | _PAGE_USER); 146 } 147 #endif 148 149 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 150 { 151 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); 152 } 153 154 /* Insert a PTE, top-level function is out of line. It uses an inline 155 * low level function in the respective pgtable-* files 156 */ 157 extern void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, 158 pte_t pte); 159 160 /* This low level function performs the actual PTE insertion 161 * Setting the PTE depends on the MMU type and other factors. It's 162 * an horrible mess that I'm not going to try to clean up now but 163 * I'm keeping it in one place rather than spread around 164 */ 165 static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr, 166 pte_t *ptep, pte_t pte, int percpu) 167 { 168 /* Second case is 32-bit with 64-bit PTE. In this case, we 169 * can just store as long as we do the two halves in the right order 170 * with a barrier in between. 171 * In the percpu case, we also fallback to the simple update 172 */ 173 if (IS_ENABLED(CONFIG_PPC32) && IS_ENABLED(CONFIG_PTE_64BIT) && !percpu) { 174 __asm__ __volatile__("\ 175 stw%X0 %2,%0\n\ 176 mbar\n\ 177 stw%X1 %L2,%1" 178 : "=m" (*ptep), "=m" (*((unsigned char *)ptep+4)) 179 : "r" (pte) : "memory"); 180 return; 181 } 182 /* Anything else just stores the PTE normally. That covers all 64-bit 183 * cases, and 32-bit non-hash with 32-bit PTEs. 184 */ 185 #if defined(CONFIG_PPC_8xx) && defined(CONFIG_PPC_16K_PAGES) 186 ptep->pte3 = ptep->pte2 = ptep->pte1 = ptep->pte = pte_val(pte); 187 #else 188 *ptep = pte; 189 #endif 190 191 /* 192 * With hardware tablewalk, a sync is needed to ensure that 193 * subsequent accesses see the PTE we just wrote. Unlike userspace 194 * mappings, we can't tolerate spurious faults, so make sure 195 * the new PTE will be seen the first time. 196 */ 197 if (IS_ENABLED(CONFIG_PPC_BOOK3E_64) && is_kernel_addr(addr)) 198 mb(); 199 } 200 201 202 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 203 extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address, 204 pte_t *ptep, pte_t entry, int dirty); 205 206 /* 207 * Macro to mark a page protection value as "uncacheable". 208 */ 209 210 #define _PAGE_CACHE_CTL (_PAGE_COHERENT | _PAGE_GUARDED | _PAGE_NO_CACHE | \ 211 _PAGE_WRITETHRU) 212 213 #define pgprot_noncached(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \ 214 _PAGE_NO_CACHE | _PAGE_GUARDED)) 215 216 #define pgprot_noncached_wc(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \ 217 _PAGE_NO_CACHE)) 218 219 #define pgprot_cached(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \ 220 _PAGE_COHERENT)) 221 222 #if _PAGE_WRITETHRU != 0 223 #define pgprot_cached_wthru(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \ 224 _PAGE_COHERENT | _PAGE_WRITETHRU)) 225 #else 226 #define pgprot_cached_wthru(prot) pgprot_noncached(prot) 227 #endif 228 229 #define pgprot_cached_noncoherent(prot) \ 230 (__pgprot(pgprot_val(prot) & ~_PAGE_CACHE_CTL)) 231 232 #define pgprot_writecombine pgprot_noncached_wc 233 234 struct file; 235 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 236 unsigned long size, pgprot_t vma_prot); 237 #define __HAVE_PHYS_MEM_ACCESS_PROT 238 239 #ifdef CONFIG_HUGETLB_PAGE 240 static inline int hugepd_ok(hugepd_t hpd) 241 { 242 #ifdef CONFIG_PPC_8xx 243 return ((hpd_val(hpd) & _PMD_PAGE_MASK) == _PMD_PAGE_8M); 244 #else 245 /* We clear the top bit to indicate hugepd */ 246 return (hpd_val(hpd) && (hpd_val(hpd) & PD_HUGE) == 0); 247 #endif 248 } 249 250 static inline int pmd_huge(pmd_t pmd) 251 { 252 return 0; 253 } 254 255 static inline int pud_huge(pud_t pud) 256 { 257 return 0; 258 } 259 260 #define is_hugepd(hpd) (hugepd_ok(hpd)) 261 #endif 262 263 /* 264 * This gets called at the end of handling a page fault, when 265 * the kernel has put a new PTE into the page table for the process. 266 * We use it to ensure coherency between the i-cache and d-cache 267 * for the page which has just been mapped in. 268 */ 269 #if defined(CONFIG_PPC_E500) && defined(CONFIG_HUGETLB_PAGE) 270 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep); 271 #else 272 static inline 273 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) {} 274 #endif 275 276 #endif /* __ASSEMBLY__ */ 277 #endif 278