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 void set_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, 45 pte_t pte, unsigned int nr); 46 #define set_ptes set_ptes 47 #define update_mmu_cache(vma, addr, ptep) \ 48 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 49 50 #ifndef MAX_PTRS_PER_PGD 51 #define MAX_PTRS_PER_PGD PTRS_PER_PGD 52 #endif 53 54 /* Keep these as a macros to avoid include dependency mess */ 55 #define pte_page(x) pfn_to_page(pte_pfn(x)) 56 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 57 58 static inline unsigned long pte_pfn(pte_t pte) 59 { 60 return (pte_val(pte) & PTE_RPN_MASK) >> PTE_RPN_SHIFT; 61 } 62 63 /* 64 * Select all bits except the pfn 65 */ 66 static inline pgprot_t pte_pgprot(pte_t pte) 67 { 68 unsigned long pte_flags; 69 70 pte_flags = pte_val(pte) & ~PTE_RPN_MASK; 71 return __pgprot(pte_flags); 72 } 73 74 #ifndef pmd_page_vaddr 75 static inline const void *pmd_page_vaddr(pmd_t pmd) 76 { 77 return __va(pmd_val(pmd) & ~PMD_MASKED_BITS); 78 } 79 #define pmd_page_vaddr pmd_page_vaddr 80 #endif 81 /* 82 * ZERO_PAGE is a global shared page that is always zero: used 83 * for zero-mapped memory areas etc.. 84 */ 85 extern unsigned long empty_zero_page[]; 86 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 87 88 extern pgd_t swapper_pg_dir[]; 89 90 extern void paging_init(void); 91 void poking_init(void); 92 93 extern unsigned long ioremap_bot; 94 extern const pgprot_t protection_map[16]; 95 96 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 97 #define pmd_large(pmd) 0 98 #endif 99 100 /* can we use this in kvm */ 101 unsigned long vmalloc_to_phys(void *vmalloc_addr); 102 103 void pgtable_cache_add(unsigned int shift); 104 105 pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va); 106 107 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32) 108 void mark_initmem_nx(void); 109 #else 110 static inline void mark_initmem_nx(void) { } 111 #endif 112 113 /* 114 * When used, PTE_FRAG_NR is defined in subarch pgtable.h 115 * so we are sure it is included when arriving here. 116 */ 117 #ifdef PTE_FRAG_NR 118 static inline void *pte_frag_get(mm_context_t *ctx) 119 { 120 return ctx->pte_frag; 121 } 122 123 static inline void pte_frag_set(mm_context_t *ctx, void *p) 124 { 125 ctx->pte_frag = p; 126 } 127 #else 128 #define PTE_FRAG_NR 1 129 #define PTE_FRAG_SIZE_SHIFT PAGE_SHIFT 130 #define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT) 131 132 static inline void *pte_frag_get(mm_context_t *ctx) 133 { 134 return NULL; 135 } 136 137 static inline void pte_frag_set(mm_context_t *ctx, void *p) 138 { 139 } 140 #endif 141 142 #ifndef pmd_is_leaf 143 #define pmd_is_leaf pmd_is_leaf 144 static inline bool pmd_is_leaf(pmd_t pmd) 145 { 146 return false; 147 } 148 #endif 149 150 #ifndef pud_is_leaf 151 #define pud_is_leaf pud_is_leaf 152 static inline bool pud_is_leaf(pud_t pud) 153 { 154 return false; 155 } 156 #endif 157 158 #ifndef p4d_is_leaf 159 #define p4d_is_leaf p4d_is_leaf 160 static inline bool p4d_is_leaf(p4d_t p4d) 161 { 162 return false; 163 } 164 #endif 165 166 #define pmd_pgtable pmd_pgtable 167 static inline pgtable_t pmd_pgtable(pmd_t pmd) 168 { 169 return (pgtable_t)pmd_page_vaddr(pmd); 170 } 171 172 #ifdef CONFIG_PPC64 173 int __meminit vmemmap_populated(unsigned long vmemmap_addr, int vmemmap_map_size); 174 bool altmap_cross_boundary(struct vmem_altmap *altmap, unsigned long start, 175 unsigned long page_size); 176 /* 177 * mm/memory_hotplug.c:mhp_supports_memmap_on_memory goes into details 178 * some of the restrictions. We don't check for PMD_SIZE because our 179 * vmemmap allocation code can fallback correctly. The pageblock 180 * alignment requirement is met using altmap->reserve blocks. 181 */ 182 #define arch_supports_memmap_on_memory arch_supports_memmap_on_memory 183 static inline bool arch_supports_memmap_on_memory(unsigned long vmemmap_size) 184 { 185 if (!radix_enabled()) 186 return false; 187 /* 188 * With 4K page size and 2M PMD_SIZE, we can align 189 * things better with memory block size value 190 * starting from 128MB. Hence align things with PMD_SIZE. 191 */ 192 if (IS_ENABLED(CONFIG_PPC_4K_PAGES)) 193 return IS_ALIGNED(vmemmap_size, PMD_SIZE); 194 return true; 195 } 196 197 #endif /* CONFIG_PPC64 */ 198 199 #endif /* __ASSEMBLY__ */ 200 201 #endif /* _ASM_POWERPC_PGTABLE_H */ 202