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
  12struct mm_struct;
  13
  14#endif /* !__ASSEMBLY__ */
  15
  16#ifdef CONFIG_PPC_BOOK3S
  17#include <asm/book3s/pgtable.h>
  18#else
  19#include <asm/nohash/pgtable.h>
  20#endif /* !CONFIG_PPC_BOOK3S */
  21
  22#ifndef __ASSEMBLY__
  23
  24#include <asm/tlbflush.h>
  25
  26/* Keep these as a macros to avoid include dependency mess */
  27#define pte_page(x)             pfn_to_page(pte_pfn(x))
  28#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
  29
  30/*
  31 * ZERO_PAGE is a global shared page that is always zero: used
  32 * for zero-mapped memory areas etc..
  33 */
  34extern unsigned long empty_zero_page[];
  35#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  36
  37extern pgd_t swapper_pg_dir[];
  38
  39void limit_zone_pfn(enum zone_type zone, unsigned long max_pfn);
  40int dma_pfn_limit_to_zone(u64 pfn_limit);
  41extern void paging_init(void);
  42
  43/*
  44 * kern_addr_valid is intended to indicate whether an address is a valid
  45 * kernel address.  Most 32-bit archs define it as always true (like this)
  46 * but most 64-bit archs actually perform a test.  What should we do here?
  47 */
  48#define kern_addr_valid(addr)   (1)
  49
  50#include <asm-generic/pgtable.h>
  51
  52
  53/*
  54 * This gets called at the end of handling a page fault, when
  55 * the kernel has put a new PTE into the page table for the process.
  56 * We use it to ensure coherency between the i-cache and d-cache
  57 * for the page which has just been mapped in.
  58 * On machines which use an MMU hash table, we use this to put a
  59 * corresponding HPTE into the hash table ahead of time, instead of
  60 * waiting for the inevitable extra hash-table miss exception.
  61 */
  62extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *);
  63
  64extern int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
  65                       unsigned long end, int write,
  66                       struct page **pages, int *nr);
  67#ifndef CONFIG_TRANSPARENT_HUGEPAGE
  68#define pmd_large(pmd)          0
  69#endif
  70
  71/* can we use this in kvm */
  72unsigned long vmalloc_to_phys(void *vmalloc_addr);
  73
  74void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
  75void pgtable_cache_init(void);
  76
  77#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
  78void mark_initmem_nx(void);
  79#else
  80static inline void mark_initmem_nx(void) { }
  81#endif
  82
  83#endif /* __ASSEMBLY__ */
  84
  85#endif /* _ASM_POWERPC_PGTABLE_H */
  86