LXR linux/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
  13struct 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
  45static inline pmd_t *pmd_ptr(struct mm_struct *mm, unsigned long va)
  46{
  47        return pmd_offset(pud_offset(pgd_offset(mm, va), va), va);
  48}
  49
  50static inline pmd_t *pmd_ptr_k(unsigned long va)
  51{
  52        return pmd_offset(pud_offset(pgd_offset_k(va), va), va);
  53}
  54
  55static 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 */
  71static 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 */
  83extern unsigned long empty_zero_page[];
  84#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  85
  86extern pgd_t swapper_pg_dir[];
  87
  88extern void paging_init(void);
  89
  90extern 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 */
 106unsigned long vmalloc_to_phys(void *vmalloc_addr);
 107
 108void pgtable_cache_add(unsigned int shift);
 109
 110#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
 111void mark_initmem_nx(void);
 112#else
 113static inline void mark_initmem_nx(void) { }
 114#endif
 115
 116/*
 117 * When used, PTE_FRAG_NR is defined in subarch pgtable.h
 118 * so we are sure it is included when arriving here.
 119 */
 120#ifdef PTE_FRAG_NR
 121static inline void *pte_frag_get(mm_context_t *ctx)
 122{
 123        return ctx->pte_frag;
 124}
 125
 126static inline void pte_frag_set(mm_context_t *ctx, void *p)
 127{
 128        ctx->pte_frag = p;
 129}
 130#else
 131#define PTE_FRAG_NR             1
 132#define PTE_FRAG_SIZE_SHIFT     PAGE_SHIFT
 133#define PTE_FRAG_SIZE           (1UL << PTE_FRAG_SIZE_SHIFT)
 134
 135static inline void *pte_frag_get(mm_context_t *ctx)
 136{
 137        return NULL;
 138}
 139
 140static inline void pte_frag_set(mm_context_t *ctx, void *p)
 141{
 142}
 143#endif
 144
 145#ifndef pmd_is_leaf
 146#define pmd_is_leaf pmd_is_leaf
 147static inline bool pmd_is_leaf(pmd_t pmd)
 148{
 149        return false;
 150}
 151#endif
 152
 153#ifndef pud_is_leaf
 154#define pud_is_leaf pud_is_leaf
 155static inline bool pud_is_leaf(pud_t pud)
 156{
 157        return false;
 158}
 159#endif
 160
 161#ifndef pgd_is_leaf
 162#define pgd_is_leaf pgd_is_leaf
 163static inline bool pgd_is_leaf(pgd_t pgd)
 164{
 165        return false;
 166}
 167#endif
 168
 169#ifdef CONFIG_PPC64
 170#define is_ioremap_addr is_ioremap_addr
 171static inline bool is_ioremap_addr(const void *x)
 172{
 173        unsigned long addr = (unsigned long)x;
 174
 175        return addr >= IOREMAP_BASE && addr < IOREMAP_END;
 176}
 177#endif /* CONFIG_PPC64 */
 178
 179#endif /* __ASSEMBLY__ */
 180
 181#endif /* _ASM_POWERPC_PGTABLE_H */
 182