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