1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_PGTABLE_H 3 #define _ASM_POWERPC_PGTABLE_H 4 5 #ifndef __ASSEMBLER__ 6 #include <linux/mmdebug.h> 7 #include <linux/mmzone.h> 8 #include <asm/processor.h> /* For TASK_SIZE */ 9 #include <asm/mmu.h> 10 #include <asm/page.h> 11 #include <asm/tlbflush.h> 12 13 struct mm_struct; 14 15 #endif /* !__ASSEMBLER__ */ 16 17 #ifdef CONFIG_PPC_BOOK3S 18 #include <asm/book3s/pgtable.h> 19 #else 20 #include <asm/nohash/pgtable.h> 21 #endif /* !CONFIG_PPC_BOOK3S */ 22 23 /* Make modules code happy. We don't set RO yet */ 24 #define PAGE_KERNEL_EXEC PAGE_KERNEL_X 25 26 /* Advertise special mapping type for AGP */ 27 #define PAGE_AGP (PAGE_KERNEL_NC) 28 #define HAVE_PAGE_AGP 29 30 #ifndef __ASSEMBLER__ 31 32 #define PFN_PTE_SHIFT PTE_RPN_SHIFT 33 34 void set_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, 35 pte_t pte, unsigned int nr); 36 #define set_ptes set_ptes 37 void set_pte_at_unchecked(struct mm_struct *mm, unsigned long addr, 38 pte_t *ptep, pte_t pte); 39 #define update_mmu_cache(vma, addr, ptep) \ 40 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 41 42 #ifndef MAX_PTRS_PER_PGD 43 #define MAX_PTRS_PER_PGD PTRS_PER_PGD 44 #endif 45 46 /* Keep this as a macro to avoid include dependency mess */ 47 #define pte_page(x) pfn_to_page(pte_pfn(x)) 48 49 static inline unsigned long pte_pfn(pte_t pte) 50 { 51 return (pte_val(pte) & PTE_RPN_MASK) >> PTE_RPN_SHIFT; 52 } 53 54 /* 55 * Select all bits except the pfn 56 */ 57 #define pte_pgprot pte_pgprot 58 static inline pgprot_t pte_pgprot(pte_t pte) 59 { 60 unsigned long pte_flags; 61 62 pte_flags = pte_val(pte) & ~PTE_RPN_MASK; 63 return __pgprot(pte_flags); 64 } 65 66 static inline pgprot_t pgprot_nx(pgprot_t prot) 67 { 68 return pte_pgprot(pte_exprotect(__pte(pgprot_val(prot)))); 69 } 70 #define pgprot_nx pgprot_nx 71 72 #ifndef pmd_page_vaddr 73 static inline const void *pmd_page_vaddr(pmd_t pmd) 74 { 75 return __va(pmd_val(pmd) & ~PMD_MASKED_BITS); 76 } 77 #define pmd_page_vaddr pmd_page_vaddr 78 #endif 79 /* 80 * ZERO_PAGE is a global shared page that is always zero: used 81 * for zero-mapped memory areas etc.. 82 */ 83 extern unsigned long empty_zero_page[]; 84 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 85 86 extern pgd_t swapper_pg_dir[]; 87 88 extern void paging_init(void); 89 void poking_init(void); 90 91 extern unsigned long ioremap_bot; 92 extern const pgprot_t protection_map[16]; 93 94 /* can we use this in kvm */ 95 unsigned long vmalloc_to_phys(void *vmalloc_addr); 96 97 void pgtable_cache_add(unsigned int shift); 98 99 #ifdef CONFIG_PPC32 100 void __init *early_alloc_pgtable(unsigned long size); 101 #endif 102 pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va); 103 104 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32) 105 void mark_initmem_nx(void); 106 #else 107 static inline void mark_initmem_nx(void) { } 108 #endif 109 110 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 111 int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address, 112 pte_t *ptep, pte_t entry, int dirty); 113 114 pgprot_t __phys_mem_access_prot(unsigned long pfn, unsigned long size, 115 pgprot_t vma_prot); 116 117 struct file; 118 static inline pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 119 unsigned long size, pgprot_t vma_prot) 120 { 121 return __phys_mem_access_prot(pfn, size, vma_prot); 122 } 123 #define __HAVE_PHYS_MEM_ACCESS_PROT 124 125 void __update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep); 126 127 /* 128 * This gets called at the end of handling a page fault, when 129 * the kernel has put a new PTE into the page table for the process. 130 * We use it to ensure coherency between the i-cache and d-cache 131 * for the page which has just been mapped in. 132 * On machines which use an MMU hash table, we use this to put a 133 * corresponding HPTE into the hash table ahead of time, instead of 134 * waiting for the inevitable extra hash-table miss exception. 135 */ 136 static inline void update_mmu_cache_range(struct vm_fault *vmf, 137 struct vm_area_struct *vma, unsigned long address, 138 pte_t *ptep, unsigned int nr) 139 { 140 if ((mmu_has_feature(MMU_FTR_HPTE_TABLE) && !radix_enabled()) || 141 (IS_ENABLED(CONFIG_PPC_E500) && IS_ENABLED(CONFIG_HUGETLB_PAGE))) 142 __update_mmu_cache(vma, address, ptep); 143 } 144 145 /* 146 * When used, PTE_FRAG_NR is defined in subarch pgtable.h 147 * so we are sure it is included when arriving here. 148 */ 149 #ifdef PTE_FRAG_NR 150 static inline void *pte_frag_get(mm_context_t *ctx) 151 { 152 return ctx->pte_frag; 153 } 154 155 static inline void pte_frag_set(mm_context_t *ctx, void *p) 156 { 157 ctx->pte_frag = p; 158 } 159 #else 160 #define PTE_FRAG_NR 1 161 #define PTE_FRAG_SIZE_SHIFT PAGE_SHIFT 162 #define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT) 163 164 static inline void *pte_frag_get(mm_context_t *ctx) 165 { 166 return NULL; 167 } 168 169 static inline void pte_frag_set(mm_context_t *ctx, void *p) 170 { 171 } 172 #endif 173 174 #define pmd_pgtable pmd_pgtable 175 static inline pgtable_t pmd_pgtable(pmd_t pmd) 176 { 177 return (pgtable_t)pmd_page_vaddr(pmd); 178 } 179 180 #ifdef CONFIG_PPC64 181 int __meminit vmemmap_populated(unsigned long vmemmap_addr, int vmemmap_map_size); 182 bool altmap_cross_boundary(struct vmem_altmap *altmap, unsigned long start, 183 unsigned long page_size); 184 /* 185 * mm/memory_hotplug.c:mhp_supports_memmap_on_memory goes into details 186 * some of the restrictions. We don't check for PMD_SIZE because our 187 * vmemmap allocation code can fallback correctly. The pageblock 188 * alignment requirement is met using altmap->reserve blocks. 189 */ 190 #define arch_supports_memmap_on_memory arch_supports_memmap_on_memory 191 static inline bool arch_supports_memmap_on_memory(unsigned long vmemmap_size) 192 { 193 if (!radix_enabled()) 194 return false; 195 /* 196 * With 4K page size and 2M PMD_SIZE, we can align 197 * things better with memory block size value 198 * starting from 128MB. Hence align things with PMD_SIZE. 199 */ 200 if (IS_ENABLED(CONFIG_PPC_4K_PAGES)) 201 return IS_ALIGNED(vmemmap_size, PMD_SIZE); 202 return true; 203 } 204 205 #endif /* CONFIG_PPC64 */ 206 207 #ifndef pmd_user_accessible_page 208 #define pmd_user_accessible_page(pmd, addr) false 209 #endif 210 211 #ifndef pud_user_accessible_page 212 #define pud_user_accessible_page(pud, addr) false 213 #endif 214 215 #endif /* __ASSEMBLER__ */ 216 217 #endif /* _ASM_POWERPC_PGTABLE_H */ 218