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#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 */
  52static 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
  61static 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 */
  71extern unsigned long empty_zero_page[];
  72#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  73
  74extern pgd_t swapper_pg_dir[];
  75
  76extern void paging_init(void);
  77
  78extern 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 */
  92unsigned long vmalloc_to_phys(void *vmalloc_addr);
  93
  94void pgtable_cache_add(unsigned int shift);
  95
  96pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va);
  97
  98#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
  99void mark_initmem_nx(void);
 100#else
 101static 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
 109static inline void *pte_frag_get(mm_context_t *ctx)
 110{
 111        return ctx->pte_frag;
 112}
 113
 114static 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
 123static inline void *pte_frag_get(mm_context_t *ctx)
 124{
 125        return NULL;
 126}
 127
 128static 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
 135static 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
 143static 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
 151static 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
 159static 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 */
 170