arch/powerpc/include/asm/pgtable.h

   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 /* Note due to the way vm flags are laid out, the bits are XWR */
  24 #define __P000  PAGE_NONE
  25 #define __P001  PAGE_READONLY
  26 #define __P010  PAGE_COPY
  27 #define __P011  PAGE_COPY
  28 #define __P100  PAGE_READONLY_X
  29 #define __P101  PAGE_READONLY_X
  30 #define __P110  PAGE_COPY_X
  31 #define __P111  PAGE_COPY_X
  32
  33 #define __S000  PAGE_NONE
  34 #define __S001  PAGE_READONLY
  35 #define __S010  PAGE_SHARED
  36 #define __S011  PAGE_SHARED
  37 #define __S100  PAGE_READONLY_X
  38 #define __S101  PAGE_READONLY_X
  39 #define __S110  PAGE_SHARED_X
  40 #define __S111  PAGE_SHARED_X
  41
  42 #ifndef __ASSEMBLY__
  43
  44 #ifdef CONFIG_PPC32
  45 static inline pmd_t *pmd_ptr(struct mm_struct *mm, unsigned long va)
  46 {
  47         return pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, va), va), va), va);
  48 }
  49
  50 static inline pmd_t *pmd_ptr_k(unsigned long va)
  51 {
  52         return pmd_offset(pud_offset(p4d_offset(pgd_offset_k(va), va), va), va);
  53 }
  54
  55 static inline pte_t *virt_to_kpte(unsigned long vaddr)
  56 {
  57         pmd_t *pmd = pmd_ptr_k(vaddr);
  58
  59         return pmd_none(*pmd) ? NULL : pte_offset_kernel(pmd, vaddr);
  60 }
  61 #endif
  62
  63 #include <asm/tlbflush.h>
  64
  65 /* Keep these as a macros to avoid include dependency mess */
  66 #define pte_page(x)             pfn_to_page(pte_pfn(x))
  67 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
  68 /*
  69  * Select all bits except the pfn
  70  */
  71 static inline pgprot_t pte_pgprot(pte_t pte)
  72 {
  73         unsigned long pte_flags;
  74
  75         pte_flags = pte_val(pte) & ~PTE_RPN_MASK;
  76         return __pgprot(pte_flags);
  77 }
  78
  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
  90 extern unsigned long ioremap_bot;
  91
  92 /*
  93  * kern_addr_valid is intended to indicate whether an address is a valid
  94  * kernel address.  Most 32-bit archs define it as always true (like this)
  95  * but most 64-bit archs actually perform a test.  What should we do here?
  96  */
  97 #define kern_addr_valid(addr)   (1)
  98
  99 #include <asm-generic/pgtable.h>
 100
 101 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
 102 #define pmd_large(pmd)          0
 103 #endif
 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 pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va);
 111
 112 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
 113 void mark_initmem_nx(void);
 114 #else
 115 static inline void mark_initmem_nx(void) { }
 116 #endif
 117
 118 /*
 119  * When used, PTE_FRAG_NR is defined in subarch pgtable.h
 120  * so we are sure it is included when arriving here.
 121  */
 122 #ifdef PTE_FRAG_NR
 123 static inline void *pte_frag_get(mm_context_t *ctx)
 124 {
 125         return ctx->pte_frag;
 126 }
 127
 128 static inline void pte_frag_set(mm_context_t *ctx, void *p)
 129 {
 130         ctx->pte_frag = p;
 131 }
 132 #else
 133 #define PTE_FRAG_NR             1
 134 #define PTE_FRAG_SIZE_SHIFT     PAGE_SHIFT
 135 #define PTE_FRAG_SIZE           (1UL << PTE_FRAG_SIZE_SHIFT)
 136
 137 static inline void *pte_frag_get(mm_context_t *ctx)
 138 {
 139         return NULL;
 140 }
 141
 142 static inline void pte_frag_set(mm_context_t *ctx, void *p)
 143 {
 144 }
 145 #endif
 146
 147 #ifndef pmd_is_leaf
 148 #define pmd_is_leaf pmd_is_leaf
 149 static inline bool pmd_is_leaf(pmd_t pmd)
 150 {
 151         return false;
 152 }
 153 #endif
 154
 155 #ifndef pud_is_leaf
 156 #define pud_is_leaf pud_is_leaf
 157 static inline bool pud_is_leaf(pud_t pud)
 158 {
 159         return false;
 160 }
 161 #endif
 162
 163 #ifndef p4d_is_leaf
 164 #define p4d_is_leaf p4d_is_leaf
 165 static inline bool p4d_is_leaf(p4d_t p4d)
 166 {
 167         return false;
 168 }
 169 #endif
 170
 171 #ifdef CONFIG_PPC64
 172 #define is_ioremap_addr is_ioremap_addr
 173 static inline bool is_ioremap_addr(const void *x)
 174 {
 175         unsigned long addr = (unsigned long)x;
 176
 177         return addr >= IOREMAP_BASE && addr < IOREMAP_END;
 178 }
 179 #endif /* CONFIG_PPC64 */
 180
 181 #endif /* __ASSEMBLY__ */
 182
 183 #endif /* _ASM_POWERPC_PGTABLE_H */