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#ifndef __ASSEMBLY__
  24
  25#include <asm/tlbflush.h>
  26
  27/* Keep these as a macros to avoid include dependency mess */
  28#define pte_page(x)             pfn_to_page(pte_pfn(x))
  29#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
  30
  31/*
  32 * ZERO_PAGE is a global shared page that is always zero: used
  33 * for zero-mapped memory areas etc..
  34 */
  35extern unsigned long empty_zero_page[];
  36#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  37
  38extern pgd_t swapper_pg_dir[];
  39
  40void limit_zone_pfn(enum zone_type zone, unsigned long max_pfn);
  41int dma_pfn_limit_to_zone(u64 pfn_limit);
  42extern void paging_init(void);
  43
  44/*
  45 * kern_addr_valid is intended to indicate whether an address is a valid
  46 * kernel address.  Most 32-bit archs define it as always true (like this)
  47 * but most 64-bit archs actually perform a test.  What should we do here?
  48 */
  49#define kern_addr_valid(addr)   (1)
  50
  51#include <asm-generic/pgtable.h>
  52
  53
  54/*
  55 * This gets called at the end of handling a page fault, when
  56 * the kernel has put a new PTE into the page table for the process.
  57 * We use it to ensure coherency between the i-cache and d-cache
  58 * for the page which has just been mapped in.
  59 * On machines which use an MMU hash table, we use this to put a
  60 * corresponding HPTE into the hash table ahead of time, instead of
  61 * waiting for the inevitable extra hash-table miss exception.
  62 */
  63extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *);
  64
  65extern int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
  66                       unsigned long end, int write,
  67                       struct page **pages, int *nr);
  68#ifndef CONFIG_TRANSPARENT_HUGEPAGE
  69#define pmd_large(pmd)          0
  70#endif
  71
  72/* can we use this in kvm */
  73unsigned long vmalloc_to_phys(void *vmalloc_addr);
  74
  75void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
  76void pgtable_cache_init(void);
  77
  78#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
  79void mark_initmem_nx(void);
  80#else
  81static inline void mark_initmem_nx(void) { }
  82#endif
  83
  84#endif /* __ASSEMBLY__ */
  85
  86#endif /* _ASM_POWERPC_PGTABLE_H */
  87