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 #include <asm/tlbflush.h>
  45
  46 /* Keep these as a macros to avoid include dependency mess */
  47 #define pte_page(x)             pfn_to_page(pte_pfn(x))
  48 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
  49 /*
  50  * Select all bits except the pfn
  51  */
  52 static inline pgprot_t pte_pgprot(pte_t pte)
  53 {
  54         unsigned long pte_flags;
  55
  56         pte_flags = pte_val(pte) & ~PTE_RPN_MASK;
  57         return __pgprot(pte_flags);
  58 }
  59
  60 #ifndef pmd_page_vaddr
  61 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
  62 {
  63         return ((unsigned long)__va(pmd_val(pmd) & ~PMD_MASKED_BITS));
  64 }
  65 #define pmd_page_vaddr pmd_page_vaddr
  66 #endif
  67 /*
  68  * ZERO_PAGE is a global shared page that is always zero: used
  69  * for zero-mapped memory areas etc..
  70  */
  71 extern unsigned long empty_zero_page[];
  72 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  73
  74 extern pgd_t swapper_pg_dir[];
  75
  76 extern void paging_init(void);
  77
  78 extern unsigned long ioremap_bot;
  79
  80 /*
  81  * kern_addr_valid is intended to indicate whether an address is a valid
  82  * kernel address.  Most 32-bit archs define it as always true (like this)
  83  * but most 64-bit archs actually perform a test.  What should we do here?
  84  */
  85 #define kern_addr_valid(addr)   (1)
  86
  87 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
  88 #define pmd_large(pmd)          0
  89 #endif
  90
  91 /* can we use this in kvm */
  92 unsigned long vmalloc_to_phys(void *vmalloc_addr);
  93
  94 void pgtable_cache_add(unsigned int shift);
  95
  96 pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va);
  97
  98 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
  99 void mark_initmem_nx(void);
 100 #else
 101 static inline void mark_initmem_nx(void) { }
 102 #endif
 103
 104 /*
 105  * When used, PTE_FRAG_NR is defined in subarch pgtable.h
 106  * so we are sure it is included when arriving here.
 107  */
 108 #ifdef PTE_FRAG_NR
 109 static inline void *pte_frag_get(mm_context_t *ctx)
 110 {
 111         return ctx->pte_frag;
 112 }
 113
 114 static inline void pte_frag_set(mm_context_t *ctx, void *p)
 115 {
 116         ctx->pte_frag = p;
 117 }
 118 #else
 119 #define PTE_FRAG_NR             1
 120 #define PTE_FRAG_SIZE_SHIFT     PAGE_SHIFT
 121 #define PTE_FRAG_SIZE           (1UL << PTE_FRAG_SIZE_SHIFT)
 122
 123 static inline void *pte_frag_get(mm_context_t *ctx)
 124 {
 125         return NULL;
 126 }
 127
 128 static inline void pte_frag_set(mm_context_t *ctx, void *p)
 129 {
 130 }
 131 #endif
 132
 133 #ifndef pmd_is_leaf
 134 #define pmd_is_leaf pmd_is_leaf
 135 static inline bool pmd_is_leaf(pmd_t pmd)
 136 {
 137         return false;
 138 }
 139 #endif
 140
 141 #ifndef pud_is_leaf
 142 #define pud_is_leaf pud_is_leaf
 143 static inline bool pud_is_leaf(pud_t pud)
 144 {
 145         return false;
 146 }
 147 #endif
 148
 149 #ifndef p4d_is_leaf
 150 #define p4d_is_leaf p4d_is_leaf
 151 static inline bool p4d_is_leaf(p4d_t p4d)
 152 {
 153         return false;
 154 }
 155 #endif
 156
 157 #ifdef CONFIG_PPC64
 158 #define is_ioremap_addr is_ioremap_addr
 159 static inline bool is_ioremap_addr(const void *x)
 160 {
 161         unsigned long addr = (unsigned long)x;
 162
 163         return addr >= IOREMAP_BASE && addr < IOREMAP_END;
 164 }
 165 #endif /* CONFIG_PPC64 */
 166
 167 #endif /* __ASSEMBLY__ */
 168
 169 #endif /* _ASM_POWERPC_PGTABLE_H */