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
  12 struct 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  */
  34 extern unsigned long empty_zero_page[];
  35 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  36
  37 extern pgd_t swapper_pg_dir[];
  38
  39 void limit_zone_pfn(enum zone_type zone, unsigned long max_pfn);
  40 int dma_pfn_limit_to_zone(u64 pfn_limit);
  41 extern 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  */
  62 extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *);
  63
  64 extern 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 */
  72 unsigned long vmalloc_to_phys(void *vmalloc_addr);
  73
  74 void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
  75 void pgtable_cache_init(void);
  76
  77 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
  78 void mark_initmem_nx(void);
  79 #else
  80 static inline void mark_initmem_nx(void) { }
  81 #endif
  82
  83 #endif /* __ASSEMBLY__ */
  84
  85 #endif /* _ASM_POWERPC_PGTABLE_H */