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 #ifndef MAX_PTRS_PER_PGD 45 #define MAX_PTRS_PER_PGD PTRS_PER_PGD 46 #endif 47 48 /* Keep these as a macros to avoid include dependency mess */ 49 #define pte_page(x) pfn_to_page(pte_pfn(x)) 50 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 51 /* 52 * Select all bits except the pfn 53 */ 54 static inline pgprot_t pte_pgprot(pte_t pte) 55 { 56 unsigned long pte_flags; 57 58 pte_flags = pte_val(pte) & ~PTE_RPN_MASK; 59 return __pgprot(pte_flags); 60 } 61 62 #ifndef pmd_page_vaddr 63 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 64 { 65 return ((unsigned long)__va(pmd_val(pmd) & ~PMD_MASKED_BITS)); 66 } 67 #define pmd_page_vaddr pmd_page_vaddr 68 #endif 69 /* 70 * ZERO_PAGE is a global shared page that is always zero: used 71 * for zero-mapped memory areas etc.. 72 */ 73 extern unsigned long empty_zero_page[]; 74 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 75 76 extern pgd_t swapper_pg_dir[]; 77 78 extern void paging_init(void); 79 void poking_init(void); 80 81 extern unsigned long ioremap_bot; 82 extern const pgprot_t protection_map[16]; 83 84 /* 85 * kern_addr_valid is intended to indicate whether an address is a valid 86 * kernel address. Most 32-bit archs define it as always true (like this) 87 * but most 64-bit archs actually perform a test. What should we do here? 88 */ 89 #define kern_addr_valid(addr) (1) 90 91 #ifndef CONFIG_TRANSPARENT_HUGEPAGE 92 #define pmd_large(pmd) 0 93 #endif 94 95 /* can we use this in kvm */ 96 unsigned long vmalloc_to_phys(void *vmalloc_addr); 97 98 void pgtable_cache_add(unsigned int shift); 99 100 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 /* 109 * When used, PTE_FRAG_NR is defined in subarch pgtable.h 110 * so we are sure it is included when arriving here. 111 */ 112 #ifdef PTE_FRAG_NR 113 static inline void *pte_frag_get(mm_context_t *ctx) 114 { 115 return ctx->pte_frag; 116 } 117 118 static inline void pte_frag_set(mm_context_t *ctx, void *p) 119 { 120 ctx->pte_frag = p; 121 } 122 #else 123 #define PTE_FRAG_NR 1 124 #define PTE_FRAG_SIZE_SHIFT PAGE_SHIFT 125 #define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT) 126 127 static inline void *pte_frag_get(mm_context_t *ctx) 128 { 129 return NULL; 130 } 131 132 static inline void pte_frag_set(mm_context_t *ctx, void *p) 133 { 134 } 135 #endif 136 137 #ifndef pmd_is_leaf 138 #define pmd_is_leaf pmd_is_leaf 139 static inline bool pmd_is_leaf(pmd_t pmd) 140 { 141 return false; 142 } 143 #endif 144 145 #ifndef pud_is_leaf 146 #define pud_is_leaf pud_is_leaf 147 static inline bool pud_is_leaf(pud_t pud) 148 { 149 return false; 150 } 151 #endif 152 153 #ifndef p4d_is_leaf 154 #define p4d_is_leaf p4d_is_leaf 155 static inline bool p4d_is_leaf(p4d_t p4d) 156 { 157 return false; 158 } 159 #endif 160 161 #define pmd_pgtable pmd_pgtable 162 static inline pgtable_t pmd_pgtable(pmd_t pmd) 163 { 164 return (pgtable_t)pmd_page_vaddr(pmd); 165 } 166 167 #ifdef CONFIG_PPC64 168 #define is_ioremap_addr is_ioremap_addr 169 static inline bool is_ioremap_addr(const void *x) 170 { 171 unsigned long addr = (unsigned long)x; 172 173 return addr >= IOREMAP_BASE && addr < IOREMAP_END; 174 } 175 176 struct seq_file; 177 void arch_report_meminfo(struct seq_file *m); 178 #endif /* CONFIG_PPC64 */ 179 180 #endif /* __ASSEMBLY__ */ 181 182 #endif /* _ASM_POWERPC_PGTABLE_H */ 183