1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_PGTABLE_H 3 #define _ASM_POWERPC_PGTABLE_H 4 5 #ifndef __ASSEMBLY__ 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 /* !__ASSEMBLY__ */ 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 /* 24 * Protection used for kernel text. We want the debuggers to be able to 25 * set breakpoints anywhere, so don't write protect the kernel text 26 * on platforms where such control is possible. 27 */ 28 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) || \ 29 defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE) 30 #define PAGE_KERNEL_TEXT PAGE_KERNEL_X 31 #else 32 #define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX 33 #endif 34 35 /* Make modules code happy. We don't set RO yet */ 36 #define PAGE_KERNEL_EXEC PAGE_KERNEL_X 37 38 /* Advertise special mapping type for AGP */ 39 #define PAGE_AGP (PAGE_KERNEL_NC) 40 #define HAVE_PAGE_AGP 41 42 #ifndef __ASSEMBLY__ 43 44 #define PFN_PTE_SHIFT PTE_RPN_SHIFT 45 46 void set_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, 47 pte_t pte, unsigned int nr); 48 #define set_ptes set_ptes 49 #define update_mmu_cache(vma, addr, ptep) \ 50 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 51 52 #ifndef MAX_PTRS_PER_PGD 53 #define MAX_PTRS_PER_PGD PTRS_PER_PGD 54 #endif 55 56 /* Keep these as a macros to avoid include dependency mess */ 57 #define pte_page(x) pfn_to_page(pte_pfn(x)) 58 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 59 60 static inline unsigned long pte_pfn(pte_t pte) 61 { 62 return (pte_val(pte) & PTE_RPN_MASK) >> PTE_RPN_SHIFT; 63 } 64 65 /* 66 * Select all bits except the pfn 67 */ 68 #define pte_pgprot pte_pgprot 69 static inline pgprot_t pte_pgprot(pte_t pte) 70 { 71 unsigned long pte_flags; 72 73 pte_flags = pte_val(pte) & ~PTE_RPN_MASK; 74 return __pgprot(pte_flags); 75 } 76 77 static inline pgprot_t pgprot_nx(pgprot_t prot) 78 { 79 return pte_pgprot(pte_exprotect(__pte(pgprot_val(prot)))); 80 } 81 #define pgprot_nx pgprot_nx 82 83 #ifndef pmd_page_vaddr 84 static inline const void *pmd_page_vaddr(pmd_t pmd) 85 { 86 return __va(pmd_val(pmd) & ~PMD_MASKED_BITS); 87 } 88 #define pmd_page_vaddr pmd_page_vaddr 89 #endif 90 /* 91 * ZERO_PAGE is a global shared page that is always zero: used 92 * for zero-mapped memory areas etc.. 93 */ 94 extern unsigned long empty_zero_page[]; 95 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 96 97 extern pgd_t swapper_pg_dir[]; 98 99 extern void paging_init(void); 100 void poking_init(void); 101 102 extern unsigned long ioremap_bot; 103 extern const pgprot_t protection_map[16]; 104 105 /* can we use this in kvm */ 106 unsigned long vmalloc_to_phys(void *vmalloc_addr); 107 108 void pgtable_cache_add(unsigned int shift); 109 110 #ifdef CONFIG_PPC32 111 void __init *early_alloc_pgtable(unsigned long size); 112 #endif 113 pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va); 114 115 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32) 116 void mark_initmem_nx(void); 117 #else 118 static inline void mark_initmem_nx(void) { } 119 #endif 120 121 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 122 int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address, 123 pte_t *ptep, pte_t entry, int dirty); 124 125 pgprot_t __phys_mem_access_prot(unsigned long pfn, unsigned long size, 126 pgprot_t vma_prot); 127 128 struct file; 129 static inline pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 130 unsigned long size, pgprot_t vma_prot) 131 { 132 return __phys_mem_access_prot(pfn, size, vma_prot); 133 } 134 #define __HAVE_PHYS_MEM_ACCESS_PROT 135 136 void __update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep); 137 138 /* 139 * This gets called at the end of handling a page fault, when 140 * the kernel has put a new PTE into the page table for the process. 141 * We use it to ensure coherency between the i-cache and d-cache 142 * for the page which has just been mapped in. 143 * On machines which use an MMU hash table, we use this to put a 144 * corresponding HPTE into the hash table ahead of time, instead of 145 * waiting for the inevitable extra hash-table miss exception. 146 */ 147 static inline void update_mmu_cache_range(struct vm_fault *vmf, 148 struct vm_area_struct *vma, unsigned long address, 149 pte_t *ptep, unsigned int nr) 150 { 151 if ((mmu_has_feature(MMU_FTR_HPTE_TABLE) && !radix_enabled()) || 152 (IS_ENABLED(CONFIG_PPC_E500) && IS_ENABLED(CONFIG_HUGETLB_PAGE))) 153 __update_mmu_cache(vma, address, ptep); 154 } 155 156 /* 157 * When used, PTE_FRAG_NR is defined in subarch pgtable.h 158 * so we are sure it is included when arriving here. 159 */ 160 #ifdef PTE_FRAG_NR 161 static inline void *pte_frag_get(mm_context_t *ctx) 162 { 163 return ctx->pte_frag; 164 } 165 166 static inline void pte_frag_set(mm_context_t *ctx, void *p) 167 { 168 ctx->pte_frag = p; 169 } 170 #else 171 #define PTE_FRAG_NR 1 172 #define PTE_FRAG_SIZE_SHIFT PAGE_SHIFT 173 #define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT) 174 175 static inline void *pte_frag_get(mm_context_t *ctx) 176 { 177 return NULL; 178 } 179 180 static inline void pte_frag_set(mm_context_t *ctx, void *p) 181 { 182 } 183 #endif 184 185 #define pmd_pgtable pmd_pgtable 186 static inline pgtable_t pmd_pgtable(pmd_t pmd) 187 { 188 return (pgtable_t)pmd_page_vaddr(pmd); 189 } 190 191 #ifdef CONFIG_PPC64 192 int __meminit vmemmap_populated(unsigned long vmemmap_addr, int vmemmap_map_size); 193 bool altmap_cross_boundary(struct vmem_altmap *altmap, unsigned long start, 194 unsigned long page_size); 195 /* 196 * mm/memory_hotplug.c:mhp_supports_memmap_on_memory goes into details 197 * some of the restrictions. We don't check for PMD_SIZE because our 198 * vmemmap allocation code can fallback correctly. The pageblock 199 * alignment requirement is met using altmap->reserve blocks. 200 */ 201 #define arch_supports_memmap_on_memory arch_supports_memmap_on_memory 202 static inline bool arch_supports_memmap_on_memory(unsigned long vmemmap_size) 203 { 204 if (!radix_enabled()) 205 return false; 206 /* 207 * With 4K page size and 2M PMD_SIZE, we can align 208 * things better with memory block size value 209 * starting from 128MB. Hence align things with PMD_SIZE. 210 */ 211 if (IS_ENABLED(CONFIG_PPC_4K_PAGES)) 212 return IS_ALIGNED(vmemmap_size, PMD_SIZE); 213 return true; 214 } 215 216 #endif /* CONFIG_PPC64 */ 217 218 #endif /* __ASSEMBLY__ */ 219 220 #endif /* _ASM_POWERPC_PGTABLE_H */ 221